JP2005282637A - Connecting structure and connecting method of synthetic resin pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a connecting structure and a connecting method of a synthetic resin pipe capable of adopting a procedure similar with an inserting type pipe connecting method which is widely used for connection of vinyl chloride pipes. <P>SOLUTION: In the inserting type pipe connecting method for a synthetic resin pipe and a pipe joint which use a non-soluble bonding agent, the pipe connecting structure has at least one of the following items. (1) Projected ridges, a group of projections, and a plurality of circular projected ridges being coincided with at least three axis centers of the connecting section are arranged on the surface of a connecting section. (2) A part of projected ridges, a group of projections, and a plurality of circular projected ridges is removed at this side of a bottom of an opening of the synthetic resin pipe joint, or a part of them is removed at the point of the synthetic resin pipe. A free space is arranged on the bottom of the opening of the joint or the point of the synthetic resin pipe in which the non-soluble bonding agent is freely movable in the vicinity of the bottom of the opening. (3) A pocket capable of being filled with the non-soluble bonding agent is provided on the deep bottom of the opening of the synthetic resin pipe joint. (4) A part of the back of the joint and the point of the synthetic resin pipe are fitted with each other as an interference-fit structure, and a free space, in which the non-soluble bonding agent freely moves at the inlet side of the joint, is arranged so that an inlet side of the joint is set up as a loose-fit structure. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention replaces polyvinyl chloride pipes (hereinafter referred to as “PVC pipes”) widely used as water or gas pipes, and is a hard synthetic resin pipe other than PVC pipes. The present invention relates to a synthetic resin pipe joining structure and joining method that can adopt a method similar to the conventional plug-in type pipe joining method.

In recent years, paper, aluminum cans, polyethylene terephthalate bottles (hereinafter referred to as “PET” bottles, etc.) are widely recycled as resources. On the other hand, PVC pipes are said to generate harmful dioxins in their disposal, so their use is restricted in some cities and the trend is gradually spreading. For this reason, development of piping materials to replace PVC pipes has been required.
PET resin does not cause the generation of environmental pollutants in waste treatment, and is a material that has a proven track record in the waste recycling movement of schools and local governments. Development of applications for recycled products is being studied in various fields such as exterior. Research into practical use as a piping material for recycled PET resin has also been conducted (see, for example, Patent Documents 1 to 3).

Polyvinyl chloride pipes are the main materials for synthetic resin piping materials such as water supply and drainage, but materials such as polyethylene (hereinafter referred to as “PE”) and polypropylene (hereinafter referred to as “PP”) are practically used as alternative materials. It is becoming.
These piping materials generally form a pipe line by combining a straight pipe (which may be flexible) and a joint. The joint has a receiving port into which the straight pipe is fitted, and is joined by a screw structure or an adhesive structure at the fitting portion.

Since a PVC pipe can be bonded with a solvent-type adhesive (dissolvable adhesive) in terms of material properties, an adhesive structure is generally taken at the fitting portion.
Since the PVC pipe has the property of partially dissolving and swelling the adhesive surface of the PVC pipe applied by the adhesive itself, the receiving port 5 of the joint A has a tapered structure as shown in FIG. The outer diameter of the portion 2 is designed so as to match the size of the center of the mouth taper (see FIG. 9), and the straight pipe tip 2 is pushed to the joint mouth bottom 4 using dissolution / swelling of the adhesive surface. (See FIG. 10) ensures the water tightness of the joint and the joint retention of the joint and the straight pipe (joint without joining the joint and the straight pipe).

In contrast, PE and PP cannot be expected to dissolve or swell part of the resin due to the physical properties of the material, and it is difficult to dissolve and bond. It has a watertight structure. Since the construction methods are greatly different in this way, it has become a major obstacle to the adoption by many plumbing contractors who are used to the construction method of PVC pipes.
It is also possible to modify the resin component such as PE and PP by copolymerizing a radical polymerizable monomer having a functional group such as a carboxyl group or a hydroxyl group, or blending a polymer having such a functional group. Yes. These modified polymer compositions allow the use of an adhesive to some extent.

When a hard synthetic resin such as PET resin (excluding PVC pipe) is used as a piping material, PET resin can be bonded with an adhesive depending on the composition, unlike pure PE, PP, etc., which cannot use an adhesive. Is possible.
However, the adhesives are epoxy adhesives, cyanoacrylate adhesives, chloroprene adhesives, silicone adhesives, modified silicone adhesives, etc., all of which are materials such as PET (modified PE, PP This is also a non-dissolvable adhesive that does not have the property of dissolving and swelling the same as a PET. These adhesives do not shrink upon curing, are self-curing, and are solvent-type adhesives for vinyl chloride pipes (such as a mixture of solvents containing methyl ethyl ketone, cyclohexanone, tetrahydrofuran, etc. as main components of the solvent). Because it does not have the ability to dissolve and swell PET-based materials like the above, it was necessary to adopt a different joining method from PVC pipes for the water tightness of the joint and the joint retention of the joint and straight pipe .

  For example, a plurality of annular grooves formed in parallel to the outer peripheral surface of one tube end and a plurality of meshes engaged with the annular groove formed in the other tube end that is expanded so that the one tube end can be inserted. A synthetic resin pipe joint structure comprising a plurality of claws and a packing interposed between the end face of the one pipe end and the inner face of the other pipe end (see, for example, Patent Document 4) A synthetic resin pipe joint having a water-stop projection formed on the entire circumference of the connection portion, and the water-stop projection is formed thinner than the other portion so as to be elastically deformable in the radial direction (see, for example, Patent Document 5) There are proposals such as these, but all are completely different from the construction method of PVC pipe.

  The majority of plumbing contractors are familiar with PVC pipe construction methods and are prepared with tools suitable for them, so the construction methods for new resin materials other than PVC pipes are not similar to PVC pipe construction methods. The new resin material itself may not be generalized.

  When a soluble adhesive such as a PVC pipe is used, the dissolved and swollen base material will be fluidized, so the adhesive and fluidized base material in the space between the pipe and the joint during the joining process will have an excess area of adhesive. Move freely to the shortage area to ensure liquid sealing. On the other hand, when trying to obtain the same liquid sealing performance when using an insoluble adhesive, the space between the pipe and the joint must be secured larger than when using a soluble adhesive. On the other hand, as a result of this, there is a large gap, so that the bonding retention is impaired. In other words, when joining synthetic resin pipes using non-dissolvable adhesives, the first is the ability to maintain the joint position of the joint and the straight axis of the straight pipe, and the second is the area where the excess adhesive is insufficient. It has been found that there is a need for a means for forming voids to be distributed to.

  If a non-dissolvable adhesive is used, the adhesive must be applied sufficiently to the adherend surface, so that when the straight pipe is inserted into the joint, the joint and the straight pipe surface come into close contact. Excess adhesive is extruded. If the extruded adhesive sometimes protrudes from the joint mouth bottom to the pipe inner surface (wetted part), it becomes the flow resistance of the pipe. If the amount of protrusion is large, the allowable water flow will be significantly reduced. Accordingly, there is a demand for handling in the case of using a non-soluble adhesive.

JP 2003-183486 A JP 2003-213112 A JP 2003-221498 A JP-A-10-220697 Japanese Utility Model Publication No. 59-035791

  The present invention is similar to a PVC pipe using a non-dissolvable adhesive for a synthetic resin pipe and a synthetic resin pipe joint made of a hard synthetic resin (excluding a PVC pipe) such as PET, modified PE, and PP. The plug-in type pipe joint system satisfies the water tightness and the joint retention of the joint and straight pipe, and allows the excess adhesive to move to the unfilled part and has a structure that hardly protrudes to the pipe inner surface. The purpose is to develop a pipe joint structure that can be reliably joined by a person.

The present invention
[1] In a plug-in type pipe joining method of a synthetic resin pipe and a synthetic resin pipe joint using a non-soluble adhesive, for holding a pipe that matches at least three joint axial centers on either side of the joint Piping connection structure characterized by providing a ridge, a group of protrusions or a plurality of annular ridges,
[2] When the small protrusion group is a continuous ridge that coincides with the joint axis of the synthetic resin pipe and the synthetic resin pipe joint, the ridge to be joined to the synthetic resin pipe tip is the bottom of the synthetic resin pipe joint. A joint mouth bottom or tube tip free space is provided in which a part is removed before or a part of the tube tip is removed, and the insoluble adhesive can freely move around the mouth bottom. The pipe joint structure according to the above [1], characterized by:

[3] In a plug-in type pipe joining method of a synthetic resin pipe and a synthetic resin pipe joint using a non-soluble adhesive, a pocket capable of being filled with a non-soluble adhesive is provided at the back of the bottom of the synthetic resin pipe joint. Piping joint structure, characterized by
[4] In a plug-in type pipe joining system between a synthetic resin pipe and a synthetic resin pipe joint using a non-soluble adhesive, for holding a pipe that matches at least three joint cores on either side of the joint The above-mentioned [1], wherein a small protrusion group or a screw thread or a plurality of annular protrusions are provided, and a pocket capable of being filled with an insoluble adhesive is provided at the back of the bottom of the synthetic resin pipe joint. The pipe joint structure according to [3],

[5] When the small protrusion group is a continuous protrusion that coincides with the joint axis of the synthetic resin pipe and the synthetic resin pipe joint, a part of the protrusion is removed before the bottom of the synthetic resin pipe joint. Or a part of which is removed at the tip of the pipe, and further has a pocket which can be filled with an insoluble adhesive at the back of the bottom of the synthetic resin pipe joint. A pipe joint structure according to any one of the above,
[6] In the plug-in type pipe joint system between a synthetic resin pipe and a synthetic resin pipe joint using non-soluble adhesive, the inner part of the joint and the tip of the synthetic resin pipe are tightly fitted, and the joint entrance side A pipe joint structure provided with a free space in which a non-adhesive adhesive can freely move on the inlet side by using a loose-fitting structure,
[7] The above-mentioned [6], wherein the inner side of the joint is tightly fitted and the inlet side is loosely fitted, and the inner bottom of the joint has a pocket that can be filled with an insoluble adhesive. Piping joint structure,
[8] The pipe joint structure according to any one of the above [1], [2], [4], or [5], wherein the top of the small protrusion group is a triangular or circular protrusion or protrusion.

    [9] After applying a non-soluble adhesive to the joint surface of the synthetic resin pipe and / or synthetic resin pipe joint, push the tip of the synthetic resin pipe parallel to the joint axis of the synthetic resin pipe joint, and apply the adhesive. When solidifying, the pipe joint structure according to any one of the above [1] to [8] is used, and the applied non-soluble adhesive is moved to an unfilled portion and joined. The above problem was solved by developing a joining method.

  Construction method similar to the conventional PVC pipe construction method, even for piping materials that use a hard synthetic resin such as PET that cannot be dissolved and swollen using a soluble adhesive by the joining structure of the present invention Therefore, it is possible to construct a pipe that is excellent in both water tightness and retainability of the pipe receptacle and does not reduce the allowable water flow rate. For this reason, even when using resin pipes that are different from PVC pipes that generate dioxin substances, such as PET pipes recycled by waste recycling, even unskilled workers can join pipes easily and reliably. It was possible to do.

  In the present invention, the synthetic resin used for the synthetic resin pipe and the synthetic resin pipe joint may be a hard synthetic resin such as polyester, such as PET, PE, PP, etc. that can use non-soluble adhesives, and other engineering plastics. There are mainly synthetic resins that do not dissolve or swell partly with respect to the adhesive, particularly synthetic resin pipes and synthetic resin pipe joints that are manufactured from recycled PET.

Synthetic resin pipes are mainly manufactured by extrusion molding, and synthetic resin pipe joints are mainly manufactured by injection molding.
In connecting PVC pipes that use soluble adhesive, the adhesive swells and dissolves the PVC pipe, so the space between the pipe and the joint can be designed to be relatively narrow, but non-soluble adhesives are used. Sometimes it is necessary to apply a sufficient amount of adhesive to ensure watertightness, and it is necessary to design a wide space between the pipe and the joint. Since the space becomes wider, it is extremely important to match the axis of the joint between the pipe and the joint and hold it until the adhesive is cured.
If the axis is displaced, the space between the pipe and the joint may be biased to cause an adhesion defect. That is, when the shaft core is deviated, the adhesive on the side where the space is large may be insufficient. On the other hand, on the narrow side, the pipe and the joint surface may be in direct contact with each other, resulting in a surface that does not adhere. It is difficult to maintain water tightness at such adhesion defects. Naturally, the piping dimensions are distorted, and the construction quality cannot be ensured.

  In addition, when a non-soluble adhesive is used, a sufficient space for the adhesive to be applied and filled is required. However, since the amount of adhesive applied depends on the installer, there is uniformity in the circumferential direction. It is not guaranteed. Therefore, it is required that the adhesive can freely move from an excess area to an insufficient area in the space. In particular, when a mechanism for holding the tube on the shaft core is provided, the mechanism must be devised so as not to prevent free movement.

  In addition, when an insoluble adhesive is used, the adhesive is sufficiently applied to the adherend surface, so when a straight pipe is inserted into the joint, excess adhesive is pushed out into the pipe. It becomes road resistance. Therefore, it is necessary to have an appropriate gap in which the excess adhesive can be stored in the fitting surface and can be turned to the lacking portion. Although it is desirable that the amount of protrusion to the inside of the pipe line is small, it is not necessary to make it completely zero. Since the amount of the adhesive to be applied differs depending on the installer, it is sufficient if there is a pocket volume corresponding to the average amount of protrusion.

  As described so far, the joint location is firstly formed to maintain the position where the joint cores of the joint and the straight pipe coincide with each other, and secondly to form a gap for distributing excess adhesive to the lacking region. It turns out that is necessary. However, when the straight pipe is inserted into the joint, the space that guarantees the free movement of the adhesive will not be fixed and will cause extra play. In order to prevent this looseness, a small protrusion group for holding a tube or a screw thread or a plurality of annular protrusions (hereinafter collectively referred to as “ By providing the tube holding projections ”), both of the two problems could be achieved.

  At this time, if the protrusion is linear, the protrusion itself prevents free movement of the adhesive. Therefore, in the case of a linear protrusion, it is necessary to remove the portion located at the joint mouth bottom of the protrusion to ensure the flow of the adhesive. The part to be removed is not limited to the bottom of the mouth, but generally, the joint insertion port has a tapered structure in which the diameter on the entrance side becomes large, and therefore the adhesive tends to be insufficient on the entrance side. Therefore, it is preferable to provide the adhesive free movement space in the vicinity of the bottom of the mouth because a large amount of adhesive movement can be expected.

  If the synthetic resin tube has a small diameter, it is possible to insert and hold and fix the tube by simply tightening the tip of the tube without providing the tube holding projection. In this case, the synthetic resin tube It is necessary to provide a loose fitting part on the entrance side of the joint so that the non-soluble adhesive can be freely moved in the part excluding the tip part. Alternatively, in the case of a small diameter, a part of the tip of the synthetic resin pipe is removed to form a pocket, and the pocket is filled with an adhesive, thereby fulfilling the function of a free movement space (ensure water tightness). You may respond by letting it.

The pipe holding projection can hold a sufficient amount of non-soluble adhesive in the space between the synthetic resin pipe and the synthetic resin pipe joint when the synthetic resin pipe and the synthetic resin pipe joint are joined. The top of the projection for holding the tube is sandwiched between the synthetic resin pipe and the synthetic resin pipe joint, and the top of the projection for holding the tube is crushed and deformed to narrow the space, and the synthetic resin tube and the synthetic resin What is necessary is just to provide a joint of a pipe joint so that a joint axis may correspond. For this purpose, in order to correctly hold the position of the synthetic resin pipe, the pipe holding projections are required to be at least three places in the circumferential direction, continuous (linear) in the axial direction, or two places in the axial direction. If the shaft centers do not match, it may cause water leakage.
Also, it is assumed that the adhesive between the crest of the crushed tube holding projection and the joint side surface is completely pushed out and eliminated, and even if the synthetic resin tube can be fixed, the watertightness is insufficient. Is done. This danger can be eliminated by providing a free space at the distal end portion around the distal end portion of the synthetic resin tube inserted into the synthetic resin pipe joint.

The inner diameter of the synthetic resin pipe joint excluding the pipe holding protrusion (the inner diameter of the joint itself) is slightly larger than the outer diameter of the synthetic resin pipe. When the pipe holding protrusion is added, the inner diameter is less than the outer diameter. Designed to be small.
Synthetic resin pipe joints are molded by injection, so usually the joint receptacle is provided with a taper in the same way as the PVC piping system because of the mold draft, but even if it is straight, there is a problem in the function of the present invention. Absent. In addition, it is preferable to provide a stepped portion facing the end surface of the synthetic resin pipe at the bottom of the receiving port in order to reduce the step between the inner diameter of the joint wetted part and the inner diameter of the straight pipe and to confirm the end point when inserting the synthetic resin pipe.

In the above description, the type in which the tube holding projection is provided on the joint side has been mainly described, but conversely, this can be performed on the synthetic resin tube side.
When the protrusion is provided on the side of the synthetic resin pipe, it is usually provided over the entire length of the synthetic resin pipe. However, while it is easy to manufacture, there is a problem that the protrusion for holding the tube is easily damaged during transportation and construction. Although it may be provided only at the end, it is difficult to manufacture, and there is a problem that the projection for holding the tube is lost when it is cut according to the field size.

When the tube holding projection is provided on the synthetic resin pipe joint side, the tube holding projection is not damaged during transportation and construction, and it is advantageous because it is not cut and used like a straight tube. There is a problem that requires special contrivance or requires processing after injection.
For example, when the tube holding projection as shown in FIG. 1 is a ridge, it is necessary to form the synthetic resin pipe joint once and then remove the mouth bottom portion of the ridge.

  When the straight tube is inserted into the joint receptacle, the tube holding projection is plastically deformed in contact with the joint surface to produce a holding force. It is preferable to form a round ridge or protrusion.

In the case of the projection as shown in FIG. 2 or a plurality of annular projections as shown in FIG. 3, it is necessary to perform die cutting in a complicated manner for die cutting of injection.
On the other hand, in the case of the protrusions as shown in FIG. 1 or FIG. 4, the injection mold can be easily removed. In this case, in order to ensure free movement of the adhesive, the front of the mouth bottom (synthetic resin tube tip) It is preferable to remove the peripheral ridges and provide a free space in which the adhesive can freely move on the peripheral surface of the tip at the tip of the synthetic resin tube. From the advantage of manufacturing, it is easier for the protrusions of FIG. 1 or FIG. 4 to be provided with a pocket for absorbing and protruding into the synthetic resin pipe joint at the same time, so that the straight pipe can be completely fixed and bonded. The unfilled portion of the agent can be eliminated, which is extremely effective. It is also possible to provide a free space at the tip portion on the side of the synthetic resin pipe instead of the pocket or at the same time, but since the synthetic resin pipe is often cut and connected, it is preferable to provide a pocket in the synthetic resin pipe joint at the same time. .
Therefore, the type of joining form varies depending on the holding device, but can be freely selected depending on the manufacturing device, size, and construction status.

  Examples of the adhesive used for bonding include an epoxy adhesive, a cyanoacrylate adhesive, a chloroprene adhesive, a silicone adhesive, and a modified silicone adhesive. These are all non-swelling adhesives that do not have the property of dissolving and swelling PET-based materials. The properties required for these adhesives are preferably that they do not shrink during curing, are self-curing, and are cured in a short time after construction.

The present invention will be specifically described below with reference to the drawings.
FIG. 1 is a perspective view of a synthetic resin pipe joint A, which has three triangular protrusions 11 as pipe holding projections inside a synthetic resin pipe joint receiving port 5. By providing three protrusions 11, when the synthetic resin tube B inserted into this portion is inserted, it effectively acts to make the joint cores of the two coincide. The protrusion 11 is removed from the protrusion 11 in front of the joint mouth bottom 4, and a free end space 6 is provided, so that the adhesive can freely move in the free space.

  FIG. 2 is a view in which small protrusions 12 are provided in place of the protrusions 11 of the synthetic resin pipe joint A of FIG. It is necessary that the number of the small protrusions 12 is three in the minimum circumferential direction and two in the axial direction in terms of function. The number and type of the synthetic resin pipe joint receiving port 5 may be appropriately selected depending on the length of the synthetic resin pipe joint receptacle 5 so as to match the joint axis of the synthetic resin pipe and the synthetic resin pipe joint. From the convenience of manufacturing, it is preferable to provide 6 to 9 inside the synthetic resin pipe joint receiving port 5 in the axial direction and the inner peripheral surface in the same manner as the protrusion 11 in FIG. In this case, it is not necessary to provide the free end space 6 again.

In FIG. 3, the tube holding small protrusions 1 are formed in an annular shape, and a plurality, preferably three or more, are provided on the inner surface of the synthetic resin pipe joint receiving port 5 in the form of an annular protrusion 13. In this case, the distal end free space 6 does not need to be provided again. However, when a part of the annular portion is cut off, it is possible to freely move the excess adhesive in the axial direction, and to the inside of the tube. This is effective for reducing the amount of protrusion.
In FIG. 4, the tube holding small protrusions 1 are engraved on the inner surface of the synthetic resin pipe joint receiving port 5 in the form of a number of protrusions 14, which are in front of the joint mouth bottom 4. The inner part is removed, and the tip end free space 6 is provided, and the adhesive can freely move in the free space part. This is considered to be an advantageous means because it is possible to push the adhesive in the free space 6 at the tip into the gap of the trough 14 by inserting it while rotating the pipe at the time of construction, and it is easy to process.

  5 to 7 are provided with a pocket for suppressing excess adhesive from protruding into the inside of the pipe at the back of the bottom of the synthetic resin pipe joint, and FIG. 8 shows the tip of the synthetic resin pipe in addition to this. Part of the outer peripheral surface of the part is removed so that the non-soluble adhesive can freely move around the tip part. FIG. 8 shows a case in which a joint mouth bottom pocket is provided and a part of the synthetic resin pipe is removed. However, when the joint mouth bottom pocket is not provided, the removal of the tip of the pipe alone has an effect as a pocket. Without this, when applying an extra amount of non-soluble adhesive to improve water tightness, the adhesive is pushed out to the channel side, solidifies on the channel and becomes channel resistance, thus providing a pocket space at the tip. It is preferable.

  As can be understood from the above description, these small tube holding projections 1 may be provided inside the synthetic resin pipe joint receiving port 5 or may be provided in the synthetic resin pipe insertion portion of the synthetic resin pipe B. In addition, the joint cores of the synthetic resin pipe B and the synthetic resin pipe joint A may coincide with each other in order to prevent backlash which becomes a problem when the free space 6 is provided. If it is provided in the.

FIG. 9 is a cross-sectional view showing a state in which the synthetic resin pipe B is inserted into the synthetic resin pipe joint A which is also applied in the present invention and is conventionally performed. The inside of the synthetic resin pipe joint receiving port 5 has a wide opening, and has a taper that becomes narrower as it goes to the bottom of the joint port (the drawing is exaggerated. Also, in the case of PVC and PET, the dimensions are The relationship is different.) The outer diameter of the distal end portion 2 of the synthetic resin pipe B has a diameter approximately in the middle of the inner diameter of the synthetic resin pipe joint receiving port 5 of the synthetic resin pipe joint A. By strongly press-fitting, the synthetic resin pipe B and the synthetic resin It is possible to insert the distal end portion 2 of the synthetic resin pipe B up to the joint bottom portion 4 with the joint axis of the pipe joint A aligned. In this case, the adhesive is uniformly filled around the joint, and the liquid-tightness and air-tightness are maintained.
In the case of the present invention, a space for free movement of the adhesive is required, so that the outer diameter of the distal end portion 2 of the synthetic resin pipe B is approximately the diameter of the bottom portion 4 of the synthetic resin pipe joint receiving port 5 of the synthetic resin pipe joint A. It will be.

  11 and 12, the inner side of the synthetic resin pipe joint A does not become a taper, and the whole is an adhesive free movement region. Although the taper is not a necessary condition for the function of the invention, it is preferable that a slight taper is present in relation to the injection molding.

  FIG. 13 is expected to be applied to small-diameter pipe connections. The pipe tip 2 and the joint bottom bottom are interference fits 8. When the pipe is inserted, the tip is inserted into the joint deep and fixedly held. . The joint entrance side is an adhesive free movement space 9 to ensure watertightness. In this case, the small protrusion is completely unnecessary, or the portion to be installed on the back side of the joint can be omitted.

  FIG. 14 shows the state shown in FIG. 13 in which a part of the tube tip is partially excised to form a pocket, and the adhesive is filled so as not to protrude from the tube inner surface. In the case of a small diameter, watertightness is ensured by free movement of the adhesive in this pocket portion (movement from the surplus area to the deficient area).

  The present invention is a rigid synthetic resin pipe other than a PVC pipe, which is widely used as a water supply or drain pipe and is supposed to generate dioxin substances, and is a PET pipe recovered by waste recycling. Even if the synthetic resin pipe and synthetic resin pipe joint made of the manufactured PET-based hard synthetic resin are made of non-dissolvable adhesive, even if it is a plug-in type pipe joint system similar to a PVC pipe, the joint and the straight pipe It is satisfactory to maintain the coincidence of the shaft cores at the joint part of this, and by forming a gap that can distribute the excess adhesive to the insufficient part, even a non-expert can easily and surely have watertightness. The present invention provides a pipe joint structure that can be used.

The perspective view of the synthetic resin pipe joint which has three protrusions. The perspective view of the synthetic resin pipe joint which has a 3 row | line | column small protrusion group which has 2 small protrusions in 1 row. Sectional drawing of the synthetic resin pipe joint which has several cyclic | annular protrusions in a junction part inner surface. The perspective view of the synthetic resin pipe joint which provided many protrusions. Sectional drawing which provided the pocket in the mouth bottom part back of a synthetic resin pipe joint. Sectional drawing which provided the pocket of the taper structure constricted in the mouth bottom part back of the synthetic resin pipe joint. Sectional drawing which removed the mouth bottom part back of a synthetic resin pipe joint diagonally, and provided the pocket of the taper structure. Sectional drawing which removed the periphery of the front-end | tip part of a synthetic resin pipe | tube diagonally, provided the pocket in the synthetic resin pipe side, and provided the pocket in the back of the mouth bottom part of the synthetic resin pipe joint. Sectional drawing which showed the state which inserted the pipe front-end | tip, without attaching an adhesive agent to the taper of the conventional synthetic resin pipe joint. Sectional drawing which showed the state which attached the soluble adhesive to the taper of the conventional synthetic resin pipe joint, and inserted the synthetic resin pipe | tube. Sectional drawing which showed the state which provided the space which an adhesive agent can move freely in a synthetic resin pipe joint. Sectional drawing which showed the state which provided the space which can move an adhesive agent freely in a synthetic resin pipe joint, and provided the pocket in the mouth bottom part back of the joint. Sectional drawing which showed the state which provided the adhesive agent free movement area | region in the joint entrance side, making the synthetic resin pipe joint back | inner side the interference fitting, the entrance side loosely fitting, and hold | maintaining a pipe | tube tip part. The inner side of the synthetic resin pipe fitting is tightly fitted, the inlet side is loosely fitted, and a part of the pipe tip is excised to form a pocket, while holding the pipe tip, the adhesive free movement area and tip on the joint inlet side Sectional drawing which showed the state which provided the space for part filling.

Explanation of symbols

A Synthetic resin pipe joint B Synthetic resin pipe straight pipe 1 Tube holding small projection 11 Projection 12 Small projection 13 Annular projection 14 Linear projection group 2 Synthetic resin tube tip 3 Joint axis 4 Joint joint bottom 5 Synthetic resin tube Joint receptacle 6 Adhesive free movement space 7 Adhesive pocket 8 Joint back side interference fit part 9 Joint entrance side loose fit part

Claims (9)

In a plug-in type pipe joining system of a synthetic resin pipe and a synthetic resin pipe joint using a non-soluble adhesive, a protrusion for holding a pipe that matches at least three joint axial centers on either side of the joint A pipe joint structure provided with a projection group or a plurality of annular ridges. When the small protrusion group is a continuous ridge that coincides with the joint axis of the synthetic resin pipe and the synthetic resin pipe joint, the ridge joining the synthetic resin pipe tip is in front of the bottom of the synthetic resin pipe joint. A part is removed or a part is removed at the tube tip, and a joint mouth bottom or tube tip free space is provided in which the insoluble adhesive can freely move around the mouth bottom. The pipe joint structure according to claim 1. In the plug-in type piping joint method of synthetic resin pipe and synthetic resin pipe joint using non-soluble adhesive, it has a pocket that can be filled with non-soluble adhesive at the back of the bottom of the synthetic resin pipe joint Piping connection structure. In a plug-in type pipe joint system between a synthetic resin pipe and a synthetic resin pipe joint using a non-soluble adhesive, a small protrusion for holding a pipe that matches at least three joint cores on either side of the joint The group or the screw thread or the plurality of annular protrusions are provided, and the interior of the bottom portion of the synthetic resin pipe joint has a pocket that can be filled with an insoluble adhesive. Piping connection structure. When the small protrusion group is a continuous protrusion that coincides with the joint axis of the synthetic resin pipe and the synthetic resin pipe joint, the protrusion is partially removed before the bottom of the synthetic resin pipe joint, or the pipe A part is removed by the front-end | tip part, and it has a pocket which can be filled with a non-dissolvable adhesive agent in the back | inner part of the mouth part of a synthetic resin pipe joint, Furthermore, any one of Claims 1-4 characterized by the above-mentioned. Piping joint structure. In the plug-in type piping joint method of synthetic resin pipe and synthetic resin pipe joint using non-soluble adhesive, the inner part of the joint and the tip of the synthetic resin pipe have a tight fitting structure, and the joint entrance side is loosely fitted. A pipe joint structure provided with a free space in which a non-dissolvable adhesive can freely move on the entrance side as a structure. The pipe joint structure according to claim 6, wherein the joint back side is tightly fitted and the inlet side is loosely fitted, and a pocket capable of being filled with an insoluble adhesive is provided in the back of the joint mouth bottom. The pipe joint structure according to any one of claims 1, 2, 4 and 5, wherein the top of the small protrusion group is a triangular or circular protrusion or protrusion. When a non-soluble adhesive is applied to the joint surface of a synthetic resin pipe and / or synthetic resin pipe joint, the tip of the synthetic resin pipe is pushed in parallel to the joint axis of the synthetic resin pipe joint to solidify the adhesive. A method for joining synthetic resin pipes using the pipe joining structure according to any one of claims 1 to 8, wherein the applied non-soluble adhesive is moved to an unfilled part and joined. .

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