CN100545497C

CN100545497C - Resin-lined steel pipe with anti-corrosion cores at pipe ends

Info

Publication number: CN100545497C
Application number: CNB2005100763117A
Authority: CN
Inventors: 船津真一; 三村博幸; 仮屋园义久; 高田荣治; 马尼什·马图尔; 近藤哲己; 松尾周臣; 深山刚
Original assignee: Nippon Steel Corp
Current assignee: Nippon Steel Corp
Priority date: 2004-05-24
Filing date: 2005-05-24
Publication date: 2009-09-30
Anticipated expiration: 2025-05-24
Also published as: CN1702363A

Abstract

The invention provides a resin-lined steel pipe with an anti-corrosion core at the end of the pipe used for snow removal, water supply, air conditioning, fire extinguishing, drainage, etc., and its manufacturing method; the resin-lined steel pipe is a steel pipe with galvanized inner surface It has an adhesive layer, and its inner side has a polyolefin resin layer or a cross-linked polyolefin resin layer, and the steel pipe is connected and used through a joint that has been primed on the inner surface in advance and does not have the anti-corrosion function of the pipe end; the manufacturing method of the above-mentioned steel pipe As follows: the priming treatment is formed with: a phosphate chemical conversion treatment film subjected to grain refinement treatment, a cylindrical part having a size and rigidity that can be firmly fitted to the inner surface of the pipe end of the resin-lined steel pipe; and It has a shape that completely covers the end surface of the resin-lined steel pipe and can be tightly fitted after being installed on the pipe end, and has a rigid flange-shaped part. A groove is provided on the outer surface of the cylindrical part in a circumferential shape. The material is a highly corrosion-resistant metal. A rubber ring anti-corrosion core is tightly bonded to the inner surface of the flange-shaped part at the end.

Description

The plastic lined steel pipe of pipe end band corrosive protection core

Technical field

The present invention relates to a kind of plastic lined steel pipe and manufacture method thereof of pipe end band corrosive protection core, it is applicable to the occasion that can not use pipe end corrosion protection joint in pipe arrangement of snow removing, feedwater, air-conditioning, fire extinguishing, draining etc. etc.In more detail, relate to a kind of band corrosive protection core plastic lined steel pipe and manufacture method thereof, even it is when the outdoor application in cold place, because the temperature in winter is low, the contraction peeling force of the resin interlining nexine of steel pipe inner face is big, and, because the changes in temperature of temperature, under the situation that the expansion of the resin interlining nexine of steel pipe inner face and the stress relaxation that contraction causes increase, the inlay resultant force of corrosive protection core descends, the stationarity of the resin interlining nexine of the adaptation of the resin interlining nexine of steel pipe and pipe end inner face and corrosive protection core and pipe end inner face also is good through the long time.

Background technique

As the pipe arrangement material of transporting water etc., except that steel pipes such as forging welding steel pipe and Electric Welded Steel Pipe, thermoplastic pitch tubes such as PVC, polyethylene, polypropylene and polybutylene can be used as monomer and use.Steel pipe is compared with these pitch tubes, has following advantage: because mechanical strength is big, even the impact resistance during construction and to be embedded in the frequent road of traffic inferior, resistance against compression is good; Even in the high situation of conveyance fluid temperature, compare its compressive strength with pitch tube also very good; Differently with resin promptly be used in indoorly, when fire takes place, can not spread, so be excellent because be difficult to burning.

But, in the purposes of the obturation of fluid contamination that the corrosion that must prevent by steel causes and pipeline, use the pitch tube that does not corrode.As the pipe arrangement material that combination has both advantages, the inner face of having developed at steel pipe inserts the corrosion protection resin of pitch tube and the composite pipe of steel.For example, as supply pipe and waste pipe, be extensive use of and effectively utilized the steel of cheap PVC and the composite pipe of soft PVC; As giving hot-water line, be extensive use of the composite pipe of steel and rigid polyvinyl chloride respectively.

But under the situation of using pvc material, can there be the problem of bioxin in the composite pipe defective material that produces in the on-the-spot pipe arrangement construction when burning waste treatment.Therefore, supply pipe, give hot-water line, the employed composite pipe of waste pipe, wish not use PVC.

Therefore, the spy opens the 2003-294174 communique and international open WO2004-11231 communique discloses a kind of plastic lined steel pipe, it is as the alternative of PVC, be conceived to not exist the vistanex and the crosslinked polyolefin resin of the problem that produces bioxin, by tightening steel pipe, internal diameter with respect to steel pipe, the external diameter that remains in vistanex pipe and crosslinked polyolefin resin pipe becomes under the situation of big expansive force, directly carry out the inner face liner, again between steel pipe and vistanex pipe and crosslinked polyolefin resin pipe, adhesive layer and chemical conversion are set handle film, epoxy bottom coating is set as required, thus, through the long time, the adaptation of steel pipe and inner face resin interlining nexine is well as supply pipe, give hot-water line, air-conditioning, fire extinguishing, the pipe arrangement of draining etc. etc.

But, as the watering of the pipe arrangement that is used to remove the snow is with band water spraying apparatus H type joint, when must use not having the joint of pipe end function of prevent erosion, the steel pipe end face corrodes because of exposing iron, and then the bonding interface of steel pipe and inner face resin interlining nexine wearing and tearing, cohesive force weakens, and therefore, pipe end inner face resin interlining nexine is peeled off from steel pipe easily.

Therefore, must corrosive protection core be installed at pipe end, lining steel pipe end face is not corroded iron, still, when the outdoor application of cold, because temperature is low, the contraction peeling force of inner face resin interlining nexine increases, and, because the changes in temperature of temperature, because inner face resin interlining nexine expands and shrinks, its stress relaxation increases, and the inlay resultant force of corrosive protection core descends, in this case, chemical conversion is handled the contraction peeling force that film can't bear inner face resin interlining nexine as can be known, destroys fully, when the resin interlining nexine of pipe end inner face is peeled off, because flowing water, corrosive protection core comes off from pipe end.

In addition, for the inlay resultant force of controlling corrosive protection core descends, wish to increase inlay resultant force, when increase the pipe end inner face of plastic lined steel pipe during the external diameter of chimeric cylindric part, then because the rising of summer temperature after the expansion of inner face resin interlining nexine, is extruded corrosive protection core, cause the reduction of pipe end function of prevent erosion, simultaneously, want cylindric part indeformable, just must make the heavy wall structure, so, can take place that stream dwindles, the problem of the pressure loss.

Summary of the invention

In view of above-mentioned problem, the present invention relates to a kind of plastic lined steel pipe and manufacture method thereof of pipe end band corrosive protection core, even this plastic lined steel pipe is when the outdoor application of cold, because the temperature in winter is low, the contraction peeling force of the resin interlining nexine of steel pipe inner face increases, and, because the changes in temperature of temperature, the expansion of the resin interlining nexine of steel pipe inner face and contraction and the stress relaxation that causes increases, under the situation that the inlay resultant force of corrosive protection core descends, the stationarity of the resin interlining nexine of the adaptation of the resin interlining nexine of steel pipe and pipe end inner face and corrosive protection core and pipe end inner face also is good through the long time, and this plastic lined steel pipe is applicable to snow removing, feedwater, air-conditioning, fire extinguishing, the pipe arrangement of draining etc. etc. can not use the occasion of pipe end corrosion protection joint.

The present inventor has invented a kind of method, the adaptation of the resin interlining nexine of steel pipe and pipe end inner face in the time of can keeping through long time, and the stationarity of the resin interlining nexine of corrosive protection core and pipe end inner face.That is, when the outdoor application of cold, because temperature is low, because the contraction peeling force of the resin interlining nexine of steel pipe inner face increases, and, because the changes in temperature of temperature, the expansion and the contraction of the resin interlining nexine of steel pipe inner face, its stress relaxation increases, and the inlay resultant force of corrosive protection core descends, in this case, because chemical conversion is handled the contraction peeling force that film can't bear inner face resin interlining nexine, destroy fully, the resin interlining nexine of pipe end inner face is peeled off, and comes off fully from pipe end owing to the flowing water corrosive protection core simultaneously.In addition, for the inlay resultant force of controlling corrosive protection core descends, increase in order to increase inlay resultant force the pipe end inner face of plastic lined steel pipe during the external diameter of chimeric cylindric part, summer since temperature raise, after inner face resin interlining nexine expands, extrude corrosive protection core, cause the pipe end function of prevent erosion to reduce, simultaneously, for making cylindric part indeformable, just must make the heavy wall structure, thus, make stream dwindle, produce the problem of the pressure loss.

The present invention has found a kind of resin interlining nexine steel pipe of operable pipe end band corrosive protection core, bottoming as steel pipe is handled, setting is carried out the crystal grain miniaturization and is handled, and the phosphatic chemical conversion that has strengthened closing force is handled film, even when the outdoor application of cold, because winter temperature is low, chemical conversion is handled the contraction peeling force increase that film can't bear inner face resin interlining nexine, destroy fully, for the resin interlining nexine that prevents the pipe end inner face is peeled off, the outside of the cylindric part of corrosive protection core is provided with circle-shaped groove, be used to absorb the raise expansion of the inner face resin interlining nexine that causes of summer temperature, prevent to extrude corrosive protection core, simultaneously, the inner face resin interlining nexine that expands is that projection is to fetter corrosive protection core, because the inner face resin interlining nexine that the changes in temperature of temperature produce expands and shrinks, its stress relaxation increase, under the situation that the inlay resultant force of corrosive protection core descends, this resin interlining nexine steel pipe also can prevent because the flowing water corrosive protection core comes off from pipe end.Thus, the stationarity of the resin interlining nexine of the adaptation of the resin interlining nexine of steel pipe and pipe end inner face and corrosive protection core and pipe end inner face also is good through the long time, and is applicable to the occasion that can not use pipe end corrosion protection joint in the pipe arrangement of snow removing, feedwater, air-conditioning, fire extinguishing, draining etc.Main points of the present invention are as follows:

1, a kind of plastic lined steel pipe of pipe end band corrosive protection core, connecting by the joint that does not have the pipe end function of prevent erosion in the plastic lined steel pipe of use, implement zinc-plated steel pipe inner face in steel pipe or outside and had adhesive layer, and its inboard has polyolefin resin layer or crosslinked polyolefin resin layer, described steel pipe is to have carried out the steel pipe that bottoming is handled at inner face in advance, as described bottoming processing be, apply and carried out the phosphatic chemical conversion processing film that the crystal grain miniaturization is handled, it is characterized in that, at pipe end corrosive protection core is installed, described corrosive protection core is formed by cylindric part and flange shape part, and wherein said cylindric part has the size and the rigidity of the pipe end inner face that can be entrenched in described plastic lined steel pipe securely; Described flange shape part has the pipe end that covers described plastic lined steel pipe fully and shape and rigidity that can driving fit after pipe end is installed, and has groove in the outside of described cylindric part circle-shapedly.

2, as the plastic lined steel pipe of the pipe end band corrosive protection core of record in above-mentioned 1, it is characterized in that the material of above-mentioned corrosive protection core is the highly corrosion resistant metal, rubber ring is arranged in the inner face driving fit of the flange shape part of corrosive protection core.

3, as the plastic lined steel pipe of the above-mentioned 1 or 2 pipe end band corrosive protection cores of putting down in writing, it is characterized in that having epoxy bottom coating between above-mentioned steel pipe and the above-mentioned adhesive layer.

4, as the plastic lined steel pipe of pipe end band corrosive protection cores of above-mentioned 1 or 2 records, it is characterized in that,, replaces zinc-plated and have disposable rust preventive painting, zinc-rich paint application, spray metallization film or polyolefin and be covered in the outside of above-mentioned plastic lined steel pipe.

Description of drawings

Fig. 1 represents an example of the sectional drawing of corrosive protection core of the present invention.

Fig. 2 represents an example of the groove section shape as corrosive protection core of the present invention.。

Fig. 3 represents another example of the groove section shape as corrosive protection core of the present invention.

Fig. 4 represents another example of the groove section shape as corrosive protection core of the present invention.

Fig. 5 represents that the pipe end of plastic lined steel pipe of the present invention is equipped with an example of the sectional drawing of corrosive protection core.

Embodiment

Plastic lined steel pipe of the present invention when it is made, at first, with the steel pipe degreasing, carries out pickling and sand blast, cleans.Can carry out electroplating processes such as molten zinc plating in this steel pipe outside, external diameter is about 10～2000mm, uses about 20～170mm usually.

Then, bottoming as steel pipe is handled, when the phosphatic chemical conversion of implementing to carry out crystal grain miniaturization processing and strengthen closing force is handled film, do not find: even when the outdoor application of cold, because temperature is low, chemical conversion film can't bear inner face the resin interlining nexine the contraction peeling force increase and break the phenomenon that the resin interlining nexine of pipe end inner face is peeled off.And find that the phosphatic crystallization that chemical conversion is handled film is microgranular, then adhesion strength improves.As the chemical conversion treatment fluid, use as containing phosphoric acid, nitric acid, zine oxide, calcium carbonate and water, adjusted the mixture (calcium zinc orthophosphate activated by thallium treatment fluid) of pH with sodium hydroxide.Calcium zinc orthophosphate activated by thallium is applicable to the present invention who follows heating in the manufacturing because of excellent heat resistance.Their adding quantity can obtain good water-fast adaptation in the scope of phosphate ion 8～15g/L, nitrate ion 30～60g/L, Zinc ion 2～4g/L, calcium ion 5～10g/L, pH2.0～2.5.The representational calcium zinc orthophosphate activated by thallium treatment fluid that meets above-mentioned composition has パ Le ボ Application De P (Japanese Parkerizing company make).

The coating of chemical conversion processing film can adopt above-mentioned chemical conversion treatment fluid to after injecting coating in steel pipe dip coating, the steel pipe or spraying application, and steel pipe is washed and heating of Hot Wash hot blast or high-frequency induction heating etc., heats and drying.This chemical conversion is handled the adhesion amount of film with 1～10g/m ²About be preferred.Its adhesion amount is less than 1g/m ², chemical conversion is handled the film iron surface that can not be covered fully, so the water-fast cohesive force of inner face resin interlining nexine reduces.In addition, its adhesion amount is greater than 10g/m ², because handling, chemical conversion grows fragile secondary crystallization grain on the film, the closing force of inner face resin interlining nexine and water-fast cohesive force reduce.

The crystal grain miniaturization is handled and is performed as follows: promptly, before the coating chemical conversion is handled film, be dispersed in the treatment fluid that forms in the water (representative is プレパレ Application Z (Japanese Parkerizing company make)) with titanium colloid for example with the scope of 1～5g/L, steel pipe is carried out injecting in dip coating, the steel pipe coating or sprays application, and/or in above-mentioned chemical conversion treatment fluid, add as alkaline carbonic acid nickel, the control nickel ion is in the scope of 0.2～1.0g/L.Titanium and nickel become the nuclear that phosphatic crystal grain is separated out, and adhere in the iron surface densification, make the crystal grain miniaturization, and therefore, the area of contact of crystal grain and iron increases, and closing force improves.Do not carry out the crystal grain miniaturization and handle, then produce the big crystal grain that surpasses 10 μ m, because when carrying out the crystal grain miniaturization and handling, so its crystal grain big or small fine to 10 μ m or following is at least 3 times of closing force raisings.Their adding quantity is during less than lower limit, and the crystal grain micronized effect reduces, surpass last in limited time, the Economy variation.

Then, external diameter is littler than pipe diameter and length is longer than steel pipe vistanex pipe or crosslinked polyolefin resin pipe are inserted in the steel pipe, roll, knock or punch die deflation steel pipe, make the external diameter of vistanex pipe or crosslinked polyolefin resin pipe reduce 0.5～10%, thus, with vistanex pipe or the driving fit of crosslinked polyolefin resin pipe at the steel pipe inner face.When the minification of this vistanex pipe or crosslinked polyolefin resin pipe less than 0.5% the time, for becoming, the internal diameter of the relative steel pipe of external diameter that makes vistanex pipe or crosslinked polyolefin resin pipe reduces expansive force greatly, therefore, for its driving fit is died down in the power of steel pipe inner face, the cohesive force of inner face resin interlining nexine reduces.When the minification of this vistanex pipe or crosslinked polyolefin resin pipe greater than 10% the time, vistanex pipe or the distortion of crosslinked polyolefin resin pipe, therefore, to the closing force variation of steel pipe inner face.And pipe end is equipped with corrosive protection core, makes the plastic lined steel pipe of pipe end band corrosive protection core of the present invention.

As vistanex, use following mixture, promptly, Alathon, or the copolymer that obtains of the ethene-alpha-olefin copolymerization that makes alpha-olefins such as the same propylene of ethene, 1-butylene, 1-hexene, 1-octene, or in their mixture, in the scope of not damaging character of the present invention, add being mixed with additives such as antioxidant, ultraviolet light absorber, fire retardant, pigment, bulking agent, oiling agent, antistatic agent as required, and the mixture of other resin etc.

As crosslinked polyolefin resin, be with radical initiator with the said polyolefins resin crosslinks after, or with the material behind the silane-modified said polyolefins resin water crosslinking (crosslinked with silicane).Radical initiator use as: dicumyl peroxide, benzoyl superoxide, 2-tert-butyl peroxide, 2,5-dimethyl-2, organic peroxides such as 5-two (t-butylperoxy) hexane.And, except that above-mentioned organic peroxide, can also use azo compoundss such as azodiisobutyronitrile etc.Silane-modified is in the presence of radical initiator, the said polyolefins resin is carried out by making the olefinic unsaturated silane compound graft reaction carries out.Here, the olefinic unsaturated silane compound can be represented with following general formula.

RSiR’ _nY _3-n

(in the formula, R represents olefinic unsaturated alkyl or oxyl, R ' expression sturated aliphatic hydrocarbon base, and Y represents to add the organic group that water decomposition obtains, and n represents 0-2.)

Specifically, can use vinyltrimethoxy silane, VTES, vinyltriacetoxy silane etc.This silane-modified can carrying out with extruder in advance also can be dropped into each material composition from funnel when being shaped, partly carry out with the muller of forming machine.Cross-linking reaction is when extrusion molding and/or after being shaped, and waits by heat treatment, water treatment and carries out.During silane-modified vistanex,, preferably share silanol condensation catalyst for improving crosslinking rate.Also it can be cooperated when being shaped, also can after shaping, apply.Silanol condensation catalyst can use dibutyltin dilaurate, dioctyl tin dilaurate, cobalt naphthenate, toluenesulfonic acid etc.The crosslinked polyolefin resin that the present invention uses in the scope of not damaging performance of the present invention, can add additives such as antioxidant, ultraviolet light absorber, fire retardant, pigment, bulking agent, oiling agent, antistatic agent as required, and other resin etc.

The vistanex pipe that the present invention uses or the making method of crosslinked polyolefin resin pipe by having the circular mode of the external diameter littler than the internal diameter of the steel pipe that will carry out liner, are extruded liner tubulose, cooling, solid shape then with resin with extruder etc.The thickness of this vistanex pipe or crosslinked polyolefin resin pipe can be set arbitrarily as required, is not particularly limited, and is generally 0.3mm～10mm, preferably uses 0.5mm～5mm.And, in order to improve the cohesive force with adhesive layer, after vistanex pipe or the moulding of crosslinked polyolefin resin pipe, as required, can be to the outside with commercially available primary coat coating, oxidation processes or form asperities.

Because steel pipe and vistanex pipe or crosslinked polyolefin resin pipe almost do not have cohesiveencess, therefore, preferably have adhesive layer in the centre.The special discovery, adhesive layer by as maleic anhydride modified polyolefin, the itaconic anhydride improved polyalkene, the EMA anhydride copolymer, EMA acid anhydride acrylic copolymer, EMA acid anhydride acrylate copolymer, ethylene acrylic acid co polymer, ethylene acrylate copolymer, ethylene methacrylic acid copolymer, ethylene vinyl acetate copolymer, in the iolon a kind, two or more formations, with the fusion end temp, the fusion that is lower than vistanex pipe or crosslinked polyolefin resin pipe begins temperature, but the material that surpasses serviceability temperature forms, thus, have the cohesive force better than other material.As the polyolefin of the Bond that constitutes by maleic anhydride modified polyolefin, fuse the low-crystalline polyvinyls of 100 ℃ of end temps etc. as use.When the fusion end temp of these materials must begin temperature in the fusion more than or equal to vistanex pipe or crosslinked polyolefin resin pipe, owing to must begin the heating that temperature embodies cohesive force in fusion more than or equal to vistanex pipe or crosslinked polyolefin resin pipe, therefore vistanex pipe or crosslinked polyolefin resin pipe soften when losing expansive force, cooling off engineering owing to recrystallize the generation contractile force, weaken as the power with the driving fit of steel pipe inner face, the cohesive force of inner face resin layer reduces.In addition, when the fusion end temp of these materials in the serviceability temperature of vistanex pipe or crosslinked polyolefin resin pipe or when following, in use, because adhesive layer fuses fully, the cohesive force of inner face resin interlining nexine reduces.

The coating of above-mentioned adhesive layer is performed as follows, promptly, use has than will be in the vistanex tube outside or two layers of circular mode of the little external diameter of the pipe diameter of crosslinked polyolefin resin tube outside liner, when the moulding of vistanex pipe or during the moulding of crosslinked polyolefin resin pipe, adhesive layer is extruded jointly and be covered; Or,, adhesive layer is extruded and be covered after the moulding of vistanex pipe or after the moulding of crosslinked polyolefin resin pipe with circular mode and T shape mould.And, in order to embody cohesive force, steel pipe roll tightened, knocks tighten or after punch die tightens, utilize hot blast heating and high-frequency induction heating etc., more than or equal to the fusion end temp of adhesive layer but begin to heat under the temperature less than the fusion of vistanex pipe or crosslinked polyolefin resin pipe.Heating-up temperature is during less than the fusion end temp of adhesive layer, and adhesive layer not exclusively fuses, and does not embody the cohesive force of inner face resin interlining bottom.In addition, heating-up temperature is more than or equal to the melting temperature of vistanex pipe or crosslinked polyolefin resin pipe the time, vistanex pipe or crosslinked polyolefin resin pipe are softening and when losing expansive force, cooling off engineering owing to recrystallize the generation contractile force, weaken as the power to the driving fit of steel pipe inner face, the cohesive force of inner face resin interlining nexine reduces.The thickness of this adhesive layer can be set arbitrarily as required, is not particularly limited, and is generally 1 μ m～3mm, preferably uses 10 μ m～1.5mm.

One example of the corrosive protection core that the present invention uses is illustrated in the sectional drawing of Fig. 1.Corrosive protection core is formed by the flange shape part 2 of the end face of cylindric part 1 of the pipe end inner face that is entrenched in plastic lined steel pipe and coated with resin lined steel pipe, becomes the circle-shaped groove 3 that is provided with in the outside of cylindric part 1.The size of this cylindric part 1 can be set arbitrarily as required, is not particularly limited, but must is can be in the firm chimeric size of the pipe end inner face of plastic lined steel pipe, also needs and is installed in indeformable substantially rigidity behind the pipe end for this reason.In addition, when on the top of cylindric part 1, when being provided with taper portion and external diameter than the little guide portion 4 of plastic lined steel pipe internal diameter, then corrosive protection core is easy to be installed in pipe end.In addition, the outside of cylindric part 1, become to be provided with groove 3 circle-shapedly, if section shape shown in Fig. 2～4 V-arrangement and during spill because the temperature in summer raises, inner face resin interlining nexine 5 expands and produces the cunning that has some setbacks between the projection 6 that forms, so can obtain bigger binding force well, consider the formation of projection 6 and keeping of binding force, after pipe end was installed, shape must remain unchanged.And the shape of flange shape part 2 also can be set arbitrarily as required, is not particularly limited, but must is can be covered the fully shape of driving fit of end face with plastic lined steel pipe, must have also indeformable rigidity after pipe end is installed.Like this, because corrosive protection core must have at pipe end the indeformable rigidity in back is installed, its material can for example be used stainless steel, copper, the contour corrosion-resistant metal of titanium.

The example that above-mentioned corrosive protection core is installed in the plastic lined steel pipe pipe end is illustrated in the sectional drawing of Fig. 5.Corrosive protection core is by following installation: at first, and with the outside of the cylindric part 1 of corrosive protection core with use the inner face of flange shape part 2 of rubber ring 7 driving fits and the pipe end inner face and the end face of plastic lined steel pipe to carry out cleaning by degreasing in advance.Then, the cylindric part 1 of corrosive protection core is inserted the pipe end inner face of plastic lined steel pipe, till the end face of rubber ring 7 driving fits, beat chimeric with plastic hammer etc. at plastic lined steel pipe.In addition, in the water tightness of rubber ring 7 between the end face of flange shape part 2 that improves corrosive protection core and plastic lined steel pipe, when using the highly corrosion resistant metal, can prevent the contact corrosion of the iron and the different metal of steel pipe end face as the material that prevents corrosive protection core.For this reason, for make be installed in pipe end after rubber ring 7 do not come off, also can pit be set at the inner face of flange shape part 2.In addition, for the corrosion resistance of the end face that improves plastic lined steel pipe, after the plastic lined steel pipe degreasing, also can be at the commercially available epoxy coating of its end face coating.And, for improving the inlay resultant force of corrosive protection core and plastic lined steel pipe, after the plastic lined steel pipe degreasing, also can be at its pipe end inner face and the commercially available vistanex Bond of end face coating.

When containing epoxy bottom coating between steel pipe and the adhesive layer, can obtain good water-fast adaptation, therefore preferred the use.Epoxy bottom coating can use the mixture of forming as epoxides, pigment, additive and curing agent (epoxy resin powder priming paint).As epoxides, use as the diglycidyl ether of bisphenols A, the diglycidyl ether of bisphenols F and the glycidol ether of phenolic varnish type or cresols phenolic varnish type etc.These epoxides can use separately, also can mix according to the purposes of various resins and use.For pigment, use the fine particle powder of extender pigment class such as silica, barium sulphate, calcium carbonate and painted pigment class such as titanium oxide, carbon black.The adding quantity of these pigment, epoxy 100 weight portions in the scope of 3～50 weight portions, can obtain good water-fast adaptation relatively.Additive can use propylene oligomer and micropowder silica etc.

Curing agent can use as 2 yuan of acid such as dicyandiamide, decane dicarboxylic acids, hydrazides classes such as adipic dihydrazide, the acid anhydrides of tetrahydronaphthalene phthalic acid etc. acid adds the phenol curing agent of bisphenols A and add the amine adduct class etc. of diamides diphenyl-methane in the diglycidyl ether of bisphenols A in the diglycidyl ether of bisphenol-A.When using 2 yuan of acid, hydrazine class or phenol curing agent in the curing agent, decide curing dose with the ratio of the Ahew of the epoxide equivalent of epoxy and curing agent.The preferred epoxide equivalent 1.0 relatively of equivalent proportion, Ahew is 0.6～1.2.

When using dicyanamide in the curing agent, be to reduce solidifying temperature, add modified imidazole as curing accelerator.As this modified imidazole, for example can use: glyoxal ethyline and 2-phenylimidazole etc.The proportioning of curing agent at this moment, relative epoxy 100 weight portions, the adding quantity of dicyanamide is controlled at 3～10 weight portions, and the adding quantity of modified imidazole is controlled at 0.1～3 weight portion, can obtain good water-fast adaptation.Equally, when using the phenol curing agent, also be that to use modified imidazole as curing accelerator be effective.The representative epoxy resin powder priming paint that meets above-mentioned composition is Ha ウダ Star Network ス E (Japanese Paint company make).

The coating of above-mentioned epoxy bottom coating can be performed as follows, at the steel pipe inner face, about normal temperature～80 ℃ down, after application of epoxy bottom coating electrostatic spraying or flow draws application, steel pipe with hot blast heating and radio frequency heating, is heated about 140～220 ℃ and solidifies.The thickness of this epoxy bottom coating is about preferred 40～600 μ m.Its thickness is during less than 40 μ m, owing in the film forming boundary of powder coating or following, can not form continuous film, the water-fast adaptation of inner face resin interlining nexine reduces.In addition, consider from operability and Economy, about the preferred 600 μ m of the upper limit of this thickness.

The outside of inner face plastic lined steel pipe, replacing zinc-plated is to have disposable rust preventive painting, zinc-rich paint application, spray metallization film or polyolefin lining.As disposable rust preventive painting, be about thickness 20～30 μ m with applications such as general commercially available alcohol acids, epoxy resin coatings.As the zinc-rich paint application, be that thickness 65～85 μ m left and right sides are thick with applications such as general commercially available organic class, mineral-type zinc rich paints.In addition, in order to improve corrosion, after the zinc-rich paint application, can prevent applications such as coating with commercially available light coating and white rust as required.As the spray metallization film, use as sacrifice metallic zinc, aluminium, allumen, the aluminum-magnesium alloy of iron corrosion protection.The coating of spray metallization film at first, is carried out degreasing with the steel pipe outside, and sand blast is also cleaned.In the steel pipe outside above-mentioned spray metallization film is carried out the spraying plating of pneumatic type framework, the injection of electric arc light or electric plasma spraying then.About preferred 100～400 μ m of the thickness of this spray metallization film.Its thickness is compared with molten zinc plating during less than 100 μ m, and corrosion resistance reduces, and in addition, considers from operability and Economy, about the preferred 400 μ m of the upper limit of this thickness.And, for improving corrosion, behind the plating sputtered films of bismuth, also can prevent coating or sealing of hole primer etc. by the application white rust as required.When using the polyolefin lining, at first degreasing, sand blast or pickling and cleaning are carried out in the steel pipe outside.Then, be covered successively Bond, vistanex.

Bond uses by a kind, material that two or more constitute in maleic anhydride modified polyolefin, itaconic anhydride improved polyalkene, EMA anhydride copolymer, EMA acid anhydride acrylic copolymer, EMA acid anhydride acrylate copolymer, ethylene acrylic acid co polymer, ethylene acrylate copolymer, ethylene methacrylic acid copolymer, ethylene vinyl acetate copolymer, the iolon.The markup percentage of maleic anhydride can obtain good cohesive force in the scope of 0.05～0.5 quality % the time.

For this Bond,, extrude and be covered to the steel pipe outside with circular mode and T shape mould.During the scope of the thickness of this Bond about 80～400 μ m, can obtain good cohesive force.

As vistanex, use is in Alathon or ethene-alpha-olefin copolymer or their mixture that alpha-olefin copolymers such as ethene and propylene, 1-butylene, 1-hexene, 1-octene are obtained, add additives such as antioxidant, ultraviolet light absorber, fire retardant, pigment, bulking agent, oiling agent, antistatic agent as required, make mixed mixtures such as itself and other resin.

These vistanexes to extruding, be covered and lamination with the steel pipe outside of circular mode and T shape mould lining Bond, also can use by two layers of circular mode and the two layers of T shape mould method that Bond and vistanex be covered of extruding jointly and be covered.During the scope of the thickness of this vistanex about 0.3～10 μ m, can obtain good corrosion.

When having chemical conversion processing film, epoxy bottom coating between steel pipe and the Bond, can access good water-fast adaptation, therefore preferred the use.As the chemical conversion treatment fluid, can make as follows, for example with the mixed aqueous solution of the independent aqueous solution of chromic anhybride or itself and phosphoric acid, become 6 valency chromium and 3 valency chromium to mix the aqueous solution that exists with the organic reducing agent partial reduction, wherein add the mixture of independent silicon dioxide particles or itself and silane coupling agent, form the aqueous solution (chromate treatment fluid).Chemical conversion is handled the coating of film, can be performed as follows, and after splashing into above-mentioned chemical conversion treatment fluid continuously coating on the steel pipe, spraying application and dip coating, steel pipe with high-frequency induction heating and hot blast heating, is heated and drying.This chemical conversion is handled the adhesion amount of film and is preferably counted 100～700mg/m with whole chromium ²About.Its adhesion amount is less than 100mg/m ²Or above 700mg/m ²The time, the water-fast cohesive force of polyolefin lining reduces.

As the epoxy primary coat, use as epoxy resin powder priming paint.The coating of epoxy primary coat can be performed as follows, and handles the steel pipe of film with implementing chemical conversion, with preheatings such as high-frequency induction heating and hot blast heating, can carry out electrostatic spraying application and the primary coat of slipper dip application epoxy on its surface.About preferred 40～600 μ m of the thickness of this epoxy primary coat.Its thickness is during less than 40 μ m, and the water-fast cohesive force of polyolefin lining reduces.In addition, consider from operability and Economy, about the preferred 600 μ m of the upper limit of this thickness.

According to the present invention, bottoming as steel pipe is handled, setting has been carried out crystal grain miniaturization processing and has been strengthened the phosphatic chemical conversion processing film of closing force, when the outdoor application of cold, the contraction peeling force of the resin interlining nexine of the steel pipe inner face that lowly causes owing to temperature increases, form the processing film and can't bear it and destroy fully, the resin interlining nexine of pipe end inner face is peeled off; And, outside in the cylindric part of corrosive protection core becomes the circle-shaped groove that is provided with, be used to absorb the raise expansion of the inner face resin interlining nexine that causes of summer temperature, prevent to extrude corrosive protection core, simultaneously, the inner face resin interlining nexine projection that expands is with the constraint corrosive protection core, even because the changes in temperature of temperature, the expansion and the contraction of the resin interlining nexine of inner face, so its stress relaxation increases, the occasion that the inlay resultant force of corrosive protection core descends also can prevent because the flowing water corrosive protection core comes off from pipe end.Thus, can provide through the long time, the stationarity of the resin interlining nexine of the adaptation of the resin interlining nexine of steel pipe and pipe end inner face and corrosive protection core and pipe end inner face is also good, is applicable to the plastic lined steel pipe with end corrosive protection core that pipe arrangements such as snow removing, feedwater, air-conditioning, fire extinguishing, draining use in the time of can not using pipe end corrosion protection joint.

Below, by embodiment the present invention is carried out specific description.

Embodiment 1

Steel tube surface with external diameter 119.7mm, thick 4.15mm, long 5900mm, behind commercially available alkali cleaner degreasing, acid pickling and rust removing, be dispersed in the treatment fluid in the water (the プレパレ Application Z that Japanese Parkerizing company makes), calcium zinc orthophosphate activated by thallium treatment fluid (the バ Le ボ Application De P that Japanese Parkerizing company makes) at the titanium colloid, order is flooded steel pipe, forms chemical conversion with the hot blast heat drying and handles film.The adhesion amount that this chemical conversion is handled film is 4g/m ², its Mean particle diameter is about 5 μ m.Then, with two layers of circular mode, the polyethylene resin pipe of external diameter 108.2mm, thick 2.0mm, long 5940mm (120 ℃ of fusion beginning temperature) is when being shaped, to utilize common extrusion molding lining outside by the Bond (100 ℃ of fusion end temps) that maleic anhydride modified polyethylene constitutes, form adhesive layer.The thickness of this adhesive layer is 200 μ m.

Then, above-mentioned polyethylene resin pipe is inserted in the above-mentioned steel pipe, roll and tighten steel pipe so that the external diameter of polyethylene resin pipe reduces 2.2%, make the driving fit of steel pipe inner face that the polyethylene resin of binding pipe is arranged thus, then, in hot-blast heater, integral body is heated to 115 ℃ bonds.To cut off from the polyethylene resin pipe that steel tube end part exposes.

With the outside of above-mentioned inner face plastic lined steel pipe, with commercially available alkali cleaner degreasing, after the sand blast rust cleaning, the chromate treatment fluid is applied with dripping method (ご I drips), use high-frequency induction heating, the steel tube surface temperature is heated to 115 ℃, form chemical conversion and handle film.This chemical conversion is handled the adhesion amount of film, counts 200mg/m with whole chromium ²Use two layers of circular mode then immediately, Bond that will be made of maleic anhydride modified polyethylene and polyethylene resin are extruded jointly and are covered.The thickness of this maleic anhydride modified polyethylene binder and polyethylene resin is respectively 200 μ m and 0.5mm.

Be formed with as corrosive protection core: the top has the external diameter guide portion littler than plastic lined steel pipe internal diameter (long 10mm), outside to be provided with the cylindric part (long 25.5mm, thick 3mm) of the groove (wide 1mm, dark 1mm) of 2 circle-shaped section shapes as shown in Figure 2; And have the external diameter identical with the plastic lined steel pipe external diameter, and be provided with the flange shape part (thick 3mm) of pit that rubber ring is come off (dark 0.5mm) at inner face, material is used stainless steel.

With the outside of the cylindric part of this stainless steel corrosive protection core and the inner face of the flange shape part of driving fit styrene butadiene rubber system ring (thick 1mm) in advance, the pipe end inner face of above-mentioned plastic lined steel pipe and end face acetone degreasing, with the end face of plastic lined steel pipe with commercially available ethylene oxide resin coating, after pipe end inner face and end face applied with Bond in order with commercially available vistanex, cylindric part with stainless steel corrosive protection core, insert the pipe end inner face of plastic lined steel pipe, until the end face of styrene butadiene rubber system ring driving fit, and beat with chimeric with plastic hammer at plastic lined steel pipe.

Embodiment 2

The external diameter 119.7mm of molten zinc plating, the steel pipe inner face of thick 4.15mm, long 5900mm have been implemented in the outside, behind commercially available alkali cleaner degreasing, acid pickling and rust removing, with the titanium colloid being dispersed in treatment fluid in the water (the プレパレ Application Z that Japanese Parkerizing company makes), calcium zinc orthophosphate activated by thallium treatment fluid (the バ Le ボ Application De P that Japanese Parkerizing company makes), inject in order in the steel pipe, form chemical conversion with the hot blast heat drying and handle film.The adhesion amount that this chemical conversion is handled film is 4g/m ², its Mean particle diameter is about 5 μ m.Then, at normal temperatures,, be coated in the steel pipe inner face, in hot-blast heater, integral body be heated to 155 ℃, the formation epoxy bottom coating with the electrostatic spraying method with epoxy resin powder priming paint (the パウダ Star Network ス E that Japanese Paint company makes).The thickness of this epoxy bottom coating is 100 μ m.Then, with two layers of circular mode, the polyethylene resin pipe of external diameter 108.2mm, thick 2.0mm, long 5940mm (120 ℃ of fusion beginning temperature) is when being shaped, and the Bond (100 ℃ of fusion end temps) that maleic anhydride modified polyethylene is formed utilizes common extrusion molding lining outside, forms adhesive layer.The thickness of this adhesive layer is 200 μ m.

Then, above-mentioned polyethylene resin pipe being inserted in the above-mentioned steel pipe, making the external diameter of polyethylene resin pipe reduce 2.2% by roll tightening steel pipe, make polyethylene resin pipe and the driving fit of steel pipe inner face after, in hot-blast heater, integral body is heated to 115 ℃ bonds.To cut off from the polyethylene resin pipe that steel tube end part exposes.

Be formed with as corrosive protection core: there is the external diameter guide portion littler than plastic lined steel pipe internal diameter (long 10mm) on the top, and the outside is provided with the cylindric part (long 25.5mm, thick 3mm) of the groove (wide 1mm, dark 1mm) of 2 circle-shaped section shapes as shown in Figure 2; And have the external diameter identical with the plastic lined steel pipe external diameter, inner face is provided with the flange shape part (thick 3mm) of pit that rubber ring is come off (dark 0.5mm), material is used stainless steel.

With the outside of the cylindric part of this stainless steel corrosive protection core with in advance with the inner face of the flange shape part of styrene butadiene rubber system ring (thick 1mm) driving fit, the pipe end inner face of above-mentioned plastic lined steel pipe and end face acetone degreasing, with the end face of plastic lined steel pipe with commercially available ethylene oxide resin coating, after pipe end inner face and end face apply with Bond successively with commercially available vistanex, cylindric part with stainless steel corrosive protection core, insert the pipe end inner face of plastic lined steel pipe, until the end face of styrene butadiene rubber system ring driving fit, and beat with chimeric with plastic hammer at plastic lined steel pipe.

Embodiment 3

Steel tube surface with external diameter 119.7mm, thick 4.15mm, long 5900mm, behind commercially available alkali cleaner degreasing, acid pickling and rust removing, flood steel pipe in order with the titanium colloid being dispersed in treatment fluid in the water (the プレパレ Application Z that Japanese Parkerizing company makes), calcium zinc orthophosphate activated by thallium treatment fluid (the バ Le ボ Application De P that Japanese Parkerizing company makes), form chemical conversion with the hot blast heat drying and handle film.The adhesion amount that this chemical conversion is handled film is 4g/m ², its Mean particle diameter is about 5 μ m.Then, under the normal temperature,, be coated in the steel pipe inner face, in hot-blast heater, integral body be heated to 155 ℃, the formation epoxy bottom coating with the electrostatic spraying method with epoxy resin powder priming paint (the パウダ Star Network ス E that Japanese Paint company makes).The thickness of this epoxy bottom coating is 100 μ m.Then, with two layers of circular mode, when polyethylene resin pipe (120 ℃ of the fusion beginning temperature) shaping of external diameter 108.2mm, thick 2.0mm, long 5940mm, to utilize common extrusion molding lining by the Bond (100 ℃ of fusion end temps) that maleic anhydride modified polyethylene constitutes outside, form adhesive layer.The thickness of this adhesive layer is 200 μ m.

Then, above-mentioned polyethylene resin pipe being inserted in the above-mentioned steel pipe, making the external diameter of polyethylene resin pipe reduce 2.2% by roll tightening steel pipe, make polyethylene resin pipe and the driving fit of steel pipe inner face thus after, in hot-blast heater, integral body is heated to 115 ℃ bonds.To cut off from the polyethylene resin pipe that steel tube end part exposes.With the outside of this inner face plastic lined steel pipe,, after the sand blast rust cleaning, apply the commercially available alcohol acids coating of thick 25 μ m with commercially available alkali cleaner degreasing.

Be formed with as corrosive protection core: there is the external diameter guide portion littler than plastic lined steel pipe internal diameter (long 10mm) on the top, and the outside is provided with the cylindric part (long 25.5mm, thick 3mm) of the groove (wide 1mm, dark 1mm) of 2 circle-shaped section shapes as shown in Figure 2; Be provided with the external diameter identical with the plastic lined steel pipe external diameter, inner face is provided with the flange shape part (thick 3mm) of pit that rubber ring is come off (dark 0.5mm), material is used stainless steel.

With the outside of the cylindric part of this stainless steel corrosive protection core with in advance with the inner face of the flange shape part of styrene butadiene rubber system ring (thick 1mm) driving fit, the pipe end inner face of above-mentioned plastic lined steel pipe and end face acetone degreasing, with the end face of plastic lined steel pipe with commercially available ethylene oxide resin coating, after pipe end inner face and end face apply with Bond preface successively with commercially available vistanex, cylindric part with stainless steel corrosive protection core, insert the pipe end inner face of plastic lined steel pipe, until the end face of styrene butadiene rubber system ring driving fit, and beat with chimeric with plastic hammer at plastic lined steel pipe.

Embodiment 4

Steel tube surface with external diameter 119.7mm, thick 4.15mm, long 5900mm, behind commercially available alkali cleaner degreasing, acid pickling and rust removing, flood steel pipe in order with the titanium colloid being dispersed in treatment fluid in the water (the プレパレ Application Z that Japanese Parkerizing company makes), calcium zinc orthophosphate activated by thallium treatment fluid (the バ Le ボ Application De P that Japanese Parkerizing company makes), form chemical conversion with the hot blast heat drying and handle film.The adhesion amount that this chemical conversion is handled film is 4g/m ², its Mean particle diameter is about 5 μ m.Then, under the normal temperature,, be coated in the steel pipe inner face, in hot-blast heater, integral body be heated to 155 ℃, the formation epoxy bottom coating with the electrostatic spraying method with epoxy resin powder priming paint (the パウダ Star Network ス E that Japanese Paint company makes).The thickness of this epoxy bottom coating is 100 μ m.Then, with two layers of circular mode, when polyethylene resin pipe (120 ℃ of the fusion beginning temperature) shaping of external diameter 108.2mm, thick 2.0mm, long 5940mm, to utilize common extrusion molding lining outside by the Bond (100 ℃ of fusion end temps) that maleic anhydride modified polyethylene constitutes, form adhesive layer.The thickness of this adhesive layer is 200 μ m.

Then, above-mentioned polyethylene resin pipe is inserted in the above-mentioned steel pipe, roll to tighten steel pipe and makes the external diameter of polyethylene resin pipe reduce 2.2%, make polyethylene resin pipe and the driving fit of steel pipe inner face after, in hot-blast heater, integral body is heated to 115 ℃ bonds.To cut off from the polyethylene resin pipe that steel tube end part exposes.The outside of this inner face plastic lined steel pipe with commercially available alkali cleaner degreasing, after the sand blast rust cleaning, is applied commercially available organic class zinc rich paint coating of thick 75 μ m, apply the commercially available light coating of thick 30 μ m again.

With the outside of the cylindric part of this stainless steel corrosive protection core with in advance with the inner face of the flange shape part of styrene butadiene rubber system ring (thick 1mm) driving fit, the pipe end inner face of above-mentioned plastic lined steel pipe and end face acetone degreasing, with the end face of plastic lined steel pipe with commercially available epoxy coating, pipe end inner face and end face, after applying in order with Bond with commercially available vistanex, cylindric part with stainless steel corrosive protection core, insert the pipe end inner face of plastic lined steel pipe, until the end face of styrene butadiene rubber system ring driving fit, and beat with chimeric with plastic hammer at plastic lined steel pipe.

Embodiment 5

Steel tube surface with external diameter 119.7mm, thick 4.15mm, long 5900mm, behind commercially available alkali cleaner degreasing, acid pickling and rust removing, flood steel pipe in order with the titanium colloid being dispersed in treatment fluid in the water (the プレパレ Application Z that Japanese Parkerizing company makes), calcium zinc orthophosphate activated by thallium treatment fluid (the バ Le ボ Application De P that Japanese Parkerizing company makes), form chemical conversion with the hot blast heat drying and handle film.The adhesion amount that this chemical conversion is handled film is 4g/m ², its Mean particle diameter is about 5 μ m.Then, at normal temperatures,, be coated in the steel pipe inner face, in hot-blast heater, integral body be heated to 155 ℃, the formation epoxy bottom coating with the electrostatic spraying method with epoxy resin powder priming paint (the パウダ Star Network ス E that Japanese Paint company makes).The thickness of this epoxy bottom coating is 100 μ m.Then, with two layers of circular mode, when polyethylene resin pipe (120 ℃ of the fusion beginning temperature) shaping of external diameter 108.2mm, thick 2.0mm, long 5940mm, will form adhesive layer outside by the common extrusion molding lining of Bond (100 ℃ of fusion end temps) that maleic anhydride modified polyethylene constitutes.The thickness of this adhesive layer is 200 μ m.

Then, above-mentioned polyethylene resin pipe being inserted in the above-mentioned steel pipe, making the external diameter of polyethylene resin pipe reduce 2.2% by roll tightening steel pipe, make polyethylene resin pipe and the driving fit of steel pipe inner face after, in hot-blast heater, integral body is heated to 115 ℃ bonds.To cut off from the polyethylene resin pipe that steel tube end part exposes.With the outside of this inner face plastic lined steel pipe, with commercially available alkali cleaner degreasing, after the sand blast rust cleaning, with electric arc light method, zinc (85%) aluminium (15%) alloy of the thick 100 μ m of spraying plating, the white rust that applies thick 10 μ m then prevents coating.

Be formed with as corrosive protection core: there is the external diameter guide portion littler than plastic lined steel pipe internal diameter (long 10mm) on the top, the outside is provided with groove (the wide 1mm of 2 circle-shaped section shapes as shown in Figure 2, dark 1mm) cylindric part (long 25.5mm, thick 3mm), with have the external diameter identical with the plastic lined steel pipe external diameter, inner face is provided with the flange shape part (thick 3mm) of the pit (dark 0.5mm) that rubber ring is come off, and material is used stainless steel.

With the outside of the cylindric part of this stainless steel corrosive protection core with in advance with the inner face of the flange shape part of styrene butadiene rubber system ring (thick 1mm) driving fit, the pipe end inner face of above-mentioned plastic lined steel pipe and end face acetone degreasing, with the end face of plastic lined steel pipe with commercially available ethylene oxide resin coating, after pipe end inner face and end face applied with Bond in order with commercially available vistanex, cylindric part with stainless steel corrosive protection core, insert the pipe end inner face of plastic lined steel pipe, until the end face of styrene butadiene rubber system ring driving fit, and beat with chimeric with plastic hammer at plastic lined steel pipe.

Embodiment 6

Steel tube surface with external diameter 119.7mm, thick 4.15mm, long 5900mm, behind commercially available alkali cleaner degreasing, acid pickling and rust removing, flood steel pipe in order with the titanium colloid being dispersed in treatment fluid in the water (the プレパレ Application Z that Japanese Parkerizing company makes), calcium zinc orthophosphate activated by thallium treatment fluid (the バ Le ボ Application De P that Japanese Parkerizing company makes), form chemical conversion with the hot blast heat drying and handle film.The adhesion amount that this chemical conversion is handled film is 4g/m ², its Mean particle diameter is about 5 μ m.Then,, under normal temperature,,, in hot-blast heater, integral body is heated to 155 ℃, forms epoxy bottom coating with the coating of electrostatic spraying method with epoxy resin powder priming paint (the パウダ Star Network ス E that Japanese Paint company makes) at the steel pipe inner face.The thickness of this epoxy bottom coating is 100 μ m.Then, with two layers of circular mode, when polyethylene resin pipe (120 ℃ of the fusion beginning temperature) shaping of external diameter 108.2mm, thick 2.0mm, long 5940mm, to utilize common extrusion molding lining outside by the Bond (100 ℃ of fusion end temps) that maleic anhydride modified polyethylene constitutes, form adhesive layer.The thickness of this adhesive layer is 200 μ m.

Then, above-mentioned polyethylene resin pipe is inserted in the above-mentioned steel pipe, roll to tighten steel pipe and makes the external diameter of polyethylene resin pipe reduce 2.2%, make polyethylene resin pipe and the driving fit of steel pipe inner face after, in hot-blast heater, integral body is heated to 115 ℃ bonds.The polyethylene resin pipe that steel tube end part exposes cuts off.

With the outside of above-mentioned inner face plastic lined steel pipe, with commercially available alkali cleaner degreasing, after the sand blast rust cleaning, the chromate treatment fluid is applied with dripping method, use high-frequency induction heating, the steel tube surface temperature is heated to 115 ℃ forms chemical conversion processing film.This chemical conversion is handled the adhesion amount of film, counts 200mg/m with whole chromium ²Use two layers of circular mode then immediately, Bond that will be made of maleic anhydride modified polyethylene and polyethylene resin are extruded jointly and are covered.The thickness of this maleic anhydride modified polyethylene binder and polyethylene resin is respectively 200 μ m and 0.5mm.

Embodiment 7

As the groove section shape of corrosive protection core, use Fig. 3 (wide 1mm, dark 1mm), in addition, other is same with embodiment 6, obtains the plastic lined steel pipe of pipe end band corrosive protection core.

Embodiment 8

As the groove section shape of corrosive protection core, use Fig. 4 (wide 1mm, dark 1mm), in addition, other is same with embodiment 6, obtains the plastic lined steel pipe of pipe end band corrosive protection core.

Embodiment 9

As the material of corrosive protection core, use copper, in addition, other is same with embodiment 6, obtains the plastic lined steel pipe of pipe end band corrosive protection core.

Embodiment 10

As the material of corrosive protection core, use titanium, in addition, other is same with embodiment 6, obtains the plastic lined steel pipe of pipe end band corrosive protection core.

Embodiment 11

Steel tube surface with external diameter 119.7mm, thick 4.15mm, long 5900mm, with commercially available alkali cleaner degreasing, behind the acid pickling and rust removing, flood steel pipe in order with the titanium colloid being dispersed in treatment fluid in the water (the プレパレ Application Z that Japanese Parkerizing company makes), calcium zinc orthophosphate activated by thallium treatment fluid (the バ Le ボ Application De P that Japanese Parkerizing company makes), form chemical conversion with the hot blast heat drying and handle film.The adhesion amount that this chemical conversion is handled film is 4g/m ², its Mean particle diameter is about 5 μ m.Then, with two layers of circular mode, when acrylic resin pipe (155 ℃ of the fusion beginning temperature) shaping of external diameter 108.2mm, thick 2.0mm, long 5940mm, will form adhesive layer outside by the common extrusion molding lining of Bond (145 ℃ of fusion end temps) that maleic anhydride modified polypropylene constitutes.The thickness of this adhesive layer is 200 μ m.

Then, above-mentioned acrylic resin pipe being inserted in the above-mentioned steel pipe, making the external diameter of acrylic resin pipe reduce 2.2% by roll tightening steel pipe, make acrylic resin pipe and the driving fit of steel pipe inner face after, in hot-blast heater, integral body is heated to 150 ℃ bonds.To cut off from the acrylic resin pipe that steel tube end part exposes.

With the outside of above-mentioned inner face plastic lined steel pipe, after commercially available alkali cleaner degreasing, sand blast rust cleaning, the chromate treatment fluid is applied with dripping method, use high-frequency induction heating, the steel tube surface temperature is heated to 115 ℃ forms chemical conversion processing film.This chemical conversion is handled the adhesion amount of film, counts 200mg/m with whole chromium ²Use two layers of circular mode then immediately, Bond that will be made of maleic anhydride modified polyethylene and polyethylene resin are extruded jointly and are covered.The thickness of this maleic anhydride modified polyethylene binder and polyethylene resin is respectively 200 μ m and 0.5mm.

With the outside of the cylindric part of this stainless steel corrosive protection core with in advance with the inner face of the flange shape part of styrene butadiene rubber system ring (thick 1mm) driving fit, the pipe end inner face of above-mentioned plastic lined steel pipe and end face acetone degreasing, with the end face of plastic lined steel pipe with commercially available ethylene oxide resin coating, pipe end inner face and end face, after applying in order with Bond with commercially available vistanex, the cylindric part of stainless steel corrosive protection core is inserted into the pipe end inner face of plastic lined steel pipe, until the end face of styrene butadiene rubber system ring driving fit at plastic lined steel pipe, third and beat with chimeric with plastic hammer.

Embodiment 12

Steel tube surface with external diameter 119.7mm, thick 4.15mm, long 5900mm, behind commercially available alkali cleaner degreasing, acid pickling and rust removing, flood steel pipe in order with the titanium colloid being dispersed in treatment fluid in the water (the プレパレ Application Z that Japanese Parkerizing company makes), calcium zinc orthophosphate activated by thallium treatment fluid (the バ Le ボ Application De P that Japanese Parkerizing company makes), form chemical conversion with the hot blast heat drying and handle film.The adhesion amount that this chemical conversion is handled film is 4g/m ², its Mean particle diameter is about 5 μ m.Then, under the normal temperature,, be coated in the steel pipe inner face, in hot-blast heater, integral body be heated to 155 ℃, the formation epoxy bottom coating with the electrostatic spraying method with epoxy resin powder priming paint (the パウダ Star Network ス E that Japanese Paint company makes).The thickness of this epoxy bottom coating is 100 μ m.Then, with two layers of circular mode, when acrylic resin pipe (155 ℃ of the fusion beginning temperature) shaping of external diameter 108.2mm, thick 2.0mm, long 5940mm, will form adhesive layer outside by the common extrusion molding lining of Bond (145 ℃ of fusion end temps) that maleic anhydride modified polypropylene constitutes.The thickness of this adhesive layer is 200 μ m.

Then, above-mentioned acrylic resin pipe is inserted in the above-mentioned steel pipe, roll to tighten steel pipe and makes the external diameter of acrylic resin pipe reduce 2.2%, make acrylic resin pipe and the driving fit of steel pipe inner face after, in hot-blast heater, integral body is heated to 150 ℃ bonds.To cut off from the acrylic resin pipe that steel tube end part exposes.

Embodiment 13

Steel tube surface with external diameter 119.7mm, thick 4.15mm, long 5900mm, behind commercially available alkali cleaner degreasing, acid pickling and rust removing, flood steel pipe in order with the titanium colloid being dispersed in treatment fluid in the water (the プレパレ Application Z that Japanese Parkerizing company makes), calcium zinc orthophosphate activated by thallium treatment fluid (the バ Le ボ Application De P that Japanese Parkerizing company makes), form chemical conversion with the hot blast heat drying and handle film.The adhesion amount that this chemical conversion is handled film is 4g/m ², its Mean particle diameter is about 5 μ m.Then, with two layers of circular mode, when cross-linked polyethylene resin pipe (120 ℃ of the fusion beginning temperature) shaping of external diameter 108.2mm, thick 2.0mm, long 5940mm, to be covered by the common extrusion molding of Bond (100 ℃ of fusion end temps) that maleic anhydride modified polyethylene constitutes outside, form adhesive layer.The thickness of this adhesive layer is 200 μ m.

Then, above-mentioned cross-linked polyethylene resin pipe is inserted in the above-mentioned steel pipe, and the deflation steel pipe that rolls makes the external diameter of cross-linked polyethylene resin pipe reduce 2.2%, behind the steel pipe inner face driving fit cross-linked polyethylene resin pipe, in hot-blast heater, integral body is heated to 115 ℃ bonds.The cross-linked polyethylene resin pipe that exposes from steel tube end part cuts off.

Embodiment 14

Steel tube surface with external diameter 119.7mm, thick 4.15mm, long 5900mm, with commercially available alkali cleaner degreasing, behind the acid pickling and rust removing, flood steel pipe in order with the titanium colloid being dispersed in treatment fluid in the water (the プレパレ Application Z that Japanese Parkerizing company makes), calcium zinc orthophosphate activated by thallium treatment fluid (the バ Le ボ Application De P that Japanese Parkerizing company makes), form chemical conversion with the hot blast heat drying and handle film.The adhesion amount that this chemical conversion is handled film is 4g/m ², its Mean particle diameter is about 5 μ m.Then, under the normal temperature,, be coated in the steel pipe inner face, in hot-blast heater, integral body be heated to 155 ℃, the formation epoxy bottom coating with the electrostatic spraying method with epoxy resin powder priming paint (the パウダ Star Network ス E that Japanese Paint company makes).The thickness of this epoxy bottom coating is 100 μ m.Then, with two layers of circular mode, when cross-linked polyethylene resin pipe (120 ℃ of the fusion beginning temperature) shaping of external diameter 108.2mm, thick 2.0mm, long 5940mm, to be covered by the common extrusion molding of Bond (100 ℃ of fusion end temps) that maleic anhydride modified polyethylene constitutes outside, form adhesive layer.The thickness of this adhesive layer is 200 μ m.

Comparative example 1

Steel tube surface with external diameter 119.7mm, thick 4.15mm, long 5900mm, with commercially available alkali cleaner degreasing, behind the acid pickling and rust removing,, form chemical conversion with the hot blast heat drying and handle film with calcium zinc orthophosphate activated by thallium treatment fluid (the バ Le ボ Application De P that Japanese Parkerizing company makes) dipping steel pipe.The adhesion amount that this chemical conversion is handled film is 4g/m ², its Mean particle diameter is about 15 μ m.Then, under the normal temperature,, be coated in the steel pipe inner face, in hot-blast heater, integral body be heated to 155 ℃, the formation epoxy bottom coating with the electrostatic spraying method with epoxy resin powder priming paint (the パウダ Star Network ス E that Japanese Paint company makes).The thickness of this epoxy bottom coating is 100 μ m.Then, with two layers of circular mode, when polyethylene resin pipe (120 ℃ of the fusion beginning temperature) shaping of external diameter 108.2mm, thick 2.0mm, long 5940mm, to utilize common extrusion molding lining outside by the Bond (100 ℃ of fusion end temps) that maleic anhydride modified polyethylene constitutes, form adhesive layer.The thickness of this adhesive layer is 200 μ m.

Then, above-mentioned polyethylene resin pipe is inserted in the above-mentioned steel pipe, roll to tighten steel pipe and makes the external diameter of cross-linked polyethylene resin pipe reduce 2.2%, make polyethylene resin pipe and the driving fit of steel pipe inner face after, in hot-blast heater, integral body is heated to 115 ℃ bonds.To cut off from the polyethylene resin pipe that steel tube end part exposes.

Comparative example 2

Steel tube surface with external diameter 119.7mm, thick 4.15mm, long 5900mm, with commercially available alkali cleaner degreasing, behind the acid pickling and rust removing, be dispersed in treatment fluid in the water (the プレパレ Application Z that Japanese Parkerizing company makes), calcium zinc orthophosphate activated by thallium treatment fluid (the バ Le ボ Application De P that Japanese Parkerizing company makes) with the titanium colloid and flood steel pipe in order, form chemical conversion with the hot blast heat drying and handle film.The adhesion amount that this chemical conversion is handled film is 4g/m ², its Mean particle diameter is about 5 μ m.Then, under the normal temperature,, be coated in the steel pipe inner face, in hot-blast heater, integral body be heated to 155 ℃, the formation epoxy bottom coating with the electrostatic spraying method with epoxy resin powder priming paint (the パウダ Star Network ス E that Japanese Paint company makes).The thickness of this epoxy bottom coating is 100 μ m.Then, with two layers of circular mode, when polyethylene resin pipe (120 ℃ of the fusion beginning temperature) shaping of external diameter 108.2mm, thick 2.0mm, long 5940mm, to utilize common extrusion molding lining outside by the Bond (100 ℃ of fusion end temps) that maleic anhydride modified polyethylene constitutes, form adhesive layer.The thickness of this adhesive layer is 200 μ m.

With the outside of above-mentioned inner face plastic lined steel pipe, with commercially available alkali cleaner degreasing, after the sand blast rust cleaning, the chromate treatment fluid is applied with dripping method, use high-frequency induction heating, the steel tube surface temperature is heated to 115 ℃ forms chemical conversion processing film.This chemical conversion is handled the adhesion amount of film, counts 200mg/m with whole chromium ²Then, use two layers of circular mode immediately, Bond that will be made of maleic anhydride modified polyethylene and polyethylene resin are extruded jointly and are covered.The thickness of this maleic anhydride modified polyethylene binder and polyethylene resin is respectively 200 μ m and 0.5mm.

Be formed with as corrosive protection core: its top is provided with the cylindric part (long 25.5mm, thick 3mm) of the external diameter guide portion littler than plastic lined steel pipe internal diameter (long 10mm); And have the external diameter identical with the plastic lined steel pipe external diameter, inner face is provided with the flange shape part (thick 3mm) of pit that rubber ring is come off (dark 0.5mm), material is used stainless steel.

Comparative example 3

Steel tube surface with external diameter 119.7mm, thick 4.15mm, long 5900mm, behind commercially available alkali cleaner degreasing, acid pickling and rust removing, with calcium zinc orthophosphate activated by thallium treatment fluid (the バ Le ボ Application De P that Japanese Parkerizing company makes) dipping steel pipe, form chemical conversion with the hot blast heat drying and handle film.The adhesion amount that this chemical conversion is handled film is 4g/m ², its Mean particle diameter is about 15 μ m.Then, under the normal temperature,, be coated in the steel pipe inner face, in hot-blast heater, integral body be heated to 155 ℃, the formation epoxy bottom coating with the electrostatic spraying method with epoxy resin powder priming paint (the パウダ Star Network ス E that Japanese Paint company makes).The thickness of this epoxy bottom coating is 100 μ m.Then, with two layers of circular mode, when acrylic resin pipe (155 ℃ of the fusion beginning temperature) shaping of external diameter 108.2mm, thick 2.0mm, long 5940mm, to utilize common extrusion molding lining outside by the Bond (145 ℃ of fusion end temps) that maleic anhydride modified polypropylene constitutes, form adhesive layer.The thickness of this adhesive layer is 200 μ m.

Then, above-mentioned acrylic resin pipe is inserted in the above-mentioned steel pipe, makes the external diameter of acrylic resin pipe reduce 2.2% by tightening steel pipe, make acrylic resin pipe and the driving fit of steel pipe inner face after, in hot-blast heater, integral body is heated to 150 ℃ bonds.To cut off from the polyethylene resin pipe that steel tube end part exposes.

Comparative example 4

Steel tube surface with external diameter 119.7mm, thick 4.15mm, long 5900mm, behind commercially available alkali cleaner degreasing, acid pickling and rust removing, flood steel pipe in order with the titanium colloid being dispersed in treatment fluid in the water (the プレパレ Application Z that Japanese Parkerizing company makes), calcium zinc orthophosphate activated by thallium treatment fluid (the バ Le ボ Application De P that Japanese Parkerizing company makes), form chemical conversion with the hot blast heat drying and handle film.The adhesion amount that this chemical conversion is handled film is 4g/m ², its Mean particle diameter is about 5 μ m.Then, under normal temperature,, be coated in the steel pipe inner face, in hot-blast heater, integral body be heated to 155 ℃, the formation epoxy bottom coating with the electrostatic spraying method with epoxy resin powder priming paint (the パウダ Star Network ス E that Japanese Paint company makes).The thickness of this epoxy bottom coating is 100 μ m.Then, with two layers of circular mode, when acrylic resin pipe (155 ℃ of the fusion beginning temperature) shaping of external diameter 108.2mm, thick 2.0mm, long 5940mm, to utilize common extrusion molding lining outside by the Bond (145 ℃ of fusion end temps) that maleic anhydride modified polypropylene constitutes, form adhesive layer.The thickness of this adhesive layer is 200 μ m.

Be formed with as corrosive protection core: its top is provided with the cylindric part (long 25.5mm, thick 3mm) of the external diameter guide portion littler than plastic lined steel pipe internal diameter (long 10mm); Be provided with the external diameter identical with the plastic lined steel pipe external diameter, inner face is provided with the flange shape part (thick 3mm) of pit that rubber ring is come off (dark 0.5mm), material is used stainless steel.

Comparative example 5

Steel tube surface with external diameter 119.7mm, thick 4.15mm, long 5900mm, behind commercially available alkali cleaner degreasing, acid pickling and rust removing, with calcium zinc orthophosphate activated by thallium treatment fluid (the バ Le ボ Application De P that Japanese Parkerizing company makes) dipping steel pipe, form chemical conversion with the hot blast heat drying and handle film.The adhesion amount that this chemical conversion is handled film is 4g/m ², its Mean particle diameter is about 15 μ m.Then, the steel pipe inner face under normal temperature with epoxy resin powder priming paint (the パウダ Star Network ス E that Japanese Paint company makes), with the coating of electrostatic spraying method, in hot-blast heater, integral body is heated to 155 ℃, form epoxy bottom coating.The thickness of this epoxy bottom coating is 100 μ m.Then, with two layers of circular mode, the cross-linked polyethylene resin pipe of external diameter 108.2mm, thick 2.0mm, long 5940mm (120 ℃ of fusion beginning temperature) is when being shaped, to utilize common extrusion molding lining outside by the Bond (100 ℃ of fusion end temps) that maleic anhydride modified polyethylene constitutes, form adhesive layer.The thickness of this adhesive layer is 200 μ m.

Comparative example 6

Steel tube surface with external diameter 119.7mm, thick 4.15mm, long 5900mm, behind commercially available alkali cleaner degreasing, acid pickling and rust removing, flood steel pipe in order with the titanium colloid being dispersed in treatment fluid in the water (the プレパレ Application Z that Japanese Parkerizing company makes), calcium zinc orthophosphate activated by thallium treatment fluid (the バ Le ボ Application De P that Japanese Parkerizing company makes), form chemical conversion with the hot blast heat drying and handle film.The adhesion amount that this chemical conversion is handled film is 4g/m ², its Mean particle diameter is about 5 μ m.Then, under the normal temperature,, be coated in the steel pipe inner face, in hot-blast heater, integral body be heated to 155 ℃, the formation epoxy bottom coating with the electrostatic spraying method with epoxy resin powder priming paint (the パウダ Star Network ス E that Japanese Paint company makes).The thickness of this epoxy bottom coating is 100 μ m.Then, with two layers of circular mode, the cross-linked polyethylene resin pipe of external diameter 108.2mm, thick 2.0mm, long 5940mm (120 ℃ of fusion beginning temperature) is when being shaped, to utilize common extrusion molding lining outside by the Bond (100 ℃ of fusion end temps) that maleic anhydride modified polyethylene constitutes, form adhesive layer.The thickness of this adhesive layer is 200 μ m.

Corrosive protection core is provided with cylindric part (the long 25.5mm of the external diameter guide portion littler than plastic lined steel pipe internal diameter (long 10mm) by its top, thick 3mm), with have the external diameter identical with the plastic lined steel pipe external diameter, inner face is provided with the flange shape part (thick 3mm) of the pit (dark 0.5mm) that rubber ring is come off, and material is used stainless steel.

For the plastic lined steel pipe of the pipe end band corrosive protection core of embodiment 1～14, comparative example 1～6, suppose in cold outdoor application and reproduce the thermal cycling test that winter temperature reduces and summer temperature rises.Thermal cycling test is that the plastic lined steel pipe of the pipe end band corrosive protection core that will make is put into thermostatic chamber, be cooled to-20 ℃ after, be heated to 60 ℃ again, test.After repeating this operation 1500 times, observe the resin interlining nexine and the corrosive protection core of pipe end inner face.Condition that each is routine and observation result are shown in table 1,2.

The resin interlining nexine of the pipe end inner face of arbitrary example of embodiment 1～14 is not all peeled off, and corrosive protection core also is fixed on pipe end; Though the corrosive protection core of comparative example 1,3,5 is fixed at pipe end, the resin interlining nexine of pipe end inner face is peeled off; The resin interlining nexine of comparative example 2,4,6 pipe end inner faces is not peeled off, and extrudes situation about coming off from pipe end but have corrosive protection core.

For the plastic lined steel pipe of the pipe end band corrosive protection core of embodiment, comparative example, suppose in cold outdoor application and reproduce the water test that winter temperature reduces and summer temperature rises.Water test is the plastic lined steel pipe of the pipe end band corrosive protection core that will make, as the snow removing pipe arrangement, connects with band water spraying apparatus H type joint with watering, the warm water of 5 ℃ cold water and 60 ℃ is reached each temperature form, and carries out mutual water flowing (not watering).After repeating this operation 3000 times, observe the resin interlining nexine and the corrosive protection core of pipe end inner face.Observation result is shown in table 1,2.

The resin interlining nexine of the pipe end inner face of arbitrary example of embodiment 1～14 is not peeled off, corrosive protection core is fixed at pipe end, yet the corrosive protection core of comparative example 1,3,5 is fixed at pipe end, but the resin interlining nexine of pipe end inner face is peeled off, in the comparative example 2,4,6, because the flowing water corrosive protection core comes off from pipe end, the iron rot of steel pipe end face, the resin interlining nexine of pipe end inner face is partly peeled off.

From table, can judge, even when the outdoor application of cold, because winter temperature is low, the contraction peeling force of the resin interlining nexine of steel pipe inner face increases, and, because the changes in temperature of temperature, the expansion and the contraction of the resin interlining nexine of steel pipe inner face, so stress relaxation increases, the inlay resultant force of corrosive protection core descends under such situation, the plastic lined steel pipe of pipe end band corrosive protection core of the present invention is through the long time, and the stationarity of the resin interlining nexine of the adaptation of the resin interlining nexine of steel pipe and pipe end inner face and corrosive protection core and pipe end inner face is also intact.

Claims

1. A resin-lined steel pipe with an anti-corrosion core at the end of the pipe. Among the resin-lined steel pipes used for connection through joints that do not have the anti-corrosion function at the pipe end, the inner surface of the steel pipe or the steel pipe that has been galvanized on the outside has bonding properties. layer, and its inner side has a polyolefin resin layer or a cross-linked polyolefin resin layer. The steel pipe is a steel pipe that has been primed on the inside in advance. The chemical conversion treatment membrane of phosphate is characterized in that an anti-corrosion core is installed at the end of the pipe, and the anti-corrosion core is formed by a cylindrical part and a flange-shaped part, wherein the cylindrical part has a The size and rigidity of the inner surface of the pipe end of the resin-lined steel pipe; the flange-like part has a shape and rigidity that completely cover the pipe end of the resin-lined steel pipe and can be tightly sealed after the pipe end is installed, and is in the The outer surface of the cylindrical portion has grooves in a circumferential shape.

2. The resin-lined steel pipe with an anti-corrosion core at the pipe end according to claim 1, characterized in that the material of the anti-corrosion core is a metal with high corrosion resistance, and the inner surface of the flange-shaped part of the anti-corrosion core is tightly sealed. With rubber ring.

3. The resin-lined steel pipe with an anti-corrosion core at the pipe end according to claim 1 or 2, characterized in that there is an epoxy primer between the steel pipe and the bonding layer.

4. The resin-lined steel pipe with an anti-corrosion core at the pipe end according to claim 1 or 2, characterized in that, instead of galvanizing, the resin-lined steel pipe has a one-time anti-rust coating and zinc-rich paint on the outside. Painted, metallized, or polyolefin coated.