JPS6223485A - Method for lining inner wall surface of pipe - Google Patents

Abstract

PURPOSE:To obtain a uniform film having a desired thickness, by injecting lining materials different in viscosity in a pipeline so as to position the low viscosity one to the inside in such a state that the pipeline was closed and moving both lining materials by the pressure difference between space parts before and behind said lining materials. CONSTITUTION:Each machinery is connected to a pipe 1 to be treated divided into an appropriate length and valves 12a, 12b are opened to inject lining materials 10, 11 in the inlet end 1a of the pipe 1. In this case, if both lining materials respectively form films fixable to each other, the kinds of them may be same or different but the lining material 11 low in viscosity is injected forwardly. After the injection of a required amount of the lining materials was finished, an inlet flow amount adjusting valve 5 is adjusted to supply a pressurized fluid A in the pipe 1 and an outlet flow amount adjusting valve 6 is adjusted and opened to generate pressure difference between both sides of the lining materials 10, 11 and, by this pressure difference, both lining materials are allowed to advance at a definite speed to form a film having such a state that the films of both of them are laminated or mixed.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an improvement in a method for lining the inner wall surface of a pipe.
It is used for the rehabilitation of buried gas pipes, underground water pipes, etc., and for manufacturing lining pipes, etc. (Conventional technology) Sand jet f
Generally, a method is widely used in which the inner wall surface of the tube is polished by passing M. (a mixed fluid of an abrasive material and an air flow) into the tube, and then the inner wall surface of the tube is lined with an epoxy resin paint or the like.

As a method for lining the inner wall surface of a pipe with the paint or the like, the following methods (1), (2), and (2) have been widely used. That is, (1) paint particles are suspended in a conveying air flow, the mixed fluid is passed through the pipe at high speed, and the paint particles collide and adhere to the inner wall of the pipe during the flow, thereby forming a coating film on the inner wall of the pipe. Method of forming
No. 046, JP-A-54-127941, etc.),
■ A mixed fluid of paint and air flow is supplied into the pipe line to adhere and layer paint particles on the inner wall surface of the pipe inlet, and the paint layer adhered to the inner wall surface of the pipe pipe is sequentially coated by the air flow in the mixed fluid. A method of forming a coating on the inner mold surface of the pipe by flowing it forward (Japanese Patent Publication No. 8-24195, Japanese Patent Publication No. 58-13226)
(publications, etc.), ■ After placing two elastic objects (pigs) at a distance in the pipe and filling the space between the two elastic objects,
A method of forming a paint film on the inner wall surface of a pipe by moving both elastic bodies while holding the paint between them using fluid pressure, etc. (Japanese Patent Laid-Open No. 55-4
4320, etc.).

Methods (1), (2) and (2) above are all excellent construction methods, and have actually been put into practical use for rehabilitation of pipelines in buildings, factories, etc.

However, these methods still have many problems that need to be solved. For example, in method (2) above, polycyclic paint particles are included in the mixed fluid discharged from the end of the pipe.
Paint loss becomes a dog. In addition, a large diameter pipe requires a long time 71 to form a coating film. Therefore, it is difficult to form a thick coating film +1
Moreover, there is a further problem that it is impossible to form a thick coating film with a uniform thickness at the elbow ff (curved portion).

In addition, even in the method (2) above, the sliding properties of the elastic object are extremely poor, so it cannot be applied to R roads with many bends due to the danger of clogging during work, and the paint on the elbow part is too low. There is a point where the film thickness becomes thinner at the end, making it impossible to form a uniform and thick coating over the entire length of the pipe.

On the other hand, method (1) above is far more practical than methods (2) and (2), but it is extremely difficult to increase the thickness of the coating film on the inner wall surface of the pipe to one level or more. Being, 048
In the case of large-diameter pipes, the amount of air required increases and a large-capacity compressor is required, so there are restrictions from this point of view, and the coating thickness of the O convex part (elbow part) is smaller than that of the straight pipe part. There are still problems such as thinness compared to .

The problem with θ is due to the dynamic pressure of the air flow H (flow velocity approximately 20 to 80 m/5 ec) flowing inside the pipe, as shown in Fig. 7, or because the elbow part has a component F in the direction perpendicular to the pipe wall. The flow of the paint layer S does not flow along the inner wall R of the pipe at the elbow part,
This occurs because the water flies through the space 0 while being separated from the pipe inner wall R. As a result, the coating film on the inner wall R of the pipe is formed only by the collision and adhesion of one paint particle in the air flow, and is extremely thin (about 15 times thicker) compared to the straight pipe portion. Incidentally, the flow phenomenon of the paint layer at the elbow portion as shown in FIG. 7 was first confirmed by the inventor of the present invention through a lining test.

(Problems to be Solved by the Invention) The present invention solves the above-mentioned problems in the conventional method of lining the inner wall surface of pipes, namely: , It is difficult to apply to large diameter pipes, ■ The thickness of coating on the inner wall of the pipe is thicker (approximately 1.2 m +
This is intended to solve the following problems: 1. The thickness of the coating film at the elbow becomes extremely thin, etc. ?
1 with high efficiency, without the need for a large-capacity fluid supply device, with a comparatively thick coating thickness of 1 to 1.5 or more, and uniformly over the entire length of the pipe including the elbow. The purpose of this invention is to provide a method for lining the inner wall surface of a pipe, which can be lined to a thickness that is as thick as possible.

(Means for (determining) the top of the gap) The present invention provides a fluid processing bay with a highly viscous lining material, a lining material with a higher viscosity than this, and a lining material with a higher viscosity on the outside. In addition, a lining material with low viscosity is placed inside and injected, and the inside of the pipe to be treated is closed by both lining materials, and a pressure difference ΔP is generated between both sides of the lining material. The basic structure of the invention is to flow both lining materials by ΔP and form a lining film.

(Function) The two lining materials injected into the pipeline in a state that blocks the interior of the pipeline create a pressure difference △P between the front and rear spaces of the two lining materials.
The lining material is sequentially flowed at a constant speed, and a lining film is formed on the inner wall surface of the pipe through which both lining materials have passed. The thickness of the lining film formed is determined by the moving speed and viscosity of the lining material, and the film thickness is controlled by controlling the moving speed and viscosity.

The optimal lining material is a material that has easy viscosity adjustment, little sagging, excellent bilayer properties, and fluidity.

Due to the generation of the pressure difference ΔP, both lining materials flow together at a constant speed in a form approximately as shown in FIG. 2, and the preceding lining material 11 having a relatively low viscosity adheres to the inner wall surface of the pipe. The coating film 11 formed (by lining material 10) is slightly scraped off by the subsequent relatively high viscosity lining material 10, and the pipe wall has a state in which the films of both lining materials are laminated or are coated with both lining materials. A lining coating film 17 containing a mixture of the following is formed. In addition, if both lining materials are different materials, the lining material 11
A skin layer is formed in which the film of the lining material 10 and the film of the lining material 10 are laminated.

As stated <, n, i! ! Since the outer surface of the lining material 17 is covered with a film of the lining material 10 having high viscosity, the lining material does not sag at all. In addition, since the lining material 10 having a thickness of 1τ advances on the coating surface 11, that is, the wet surface formed by the lining material 11 of low viscosity, its advancement is performed smoothly at a slight angle.

The sag on the coating surface 11 of the high-viscosity lining material 11 is scraped off, and the outer surface is almost coated with a thin film of the high-viscosity lining material 10. First, a coating film 17 is formed on the elbow portion as well, which is extremely uniform and has a thickness approximately equal to that of the straight portion. In addition, the lining material 10 or the lining material 11
When the lining is moved independently, the thickness of the lining film at the elbow is about 2.0 to 2.5 times that of the straight pipe, but according to the present invention, the thickness of the lining film at the elbow There is no local increase in coating film thickness.

After the lining film is formed, the film is dried by ventilation or the like, and it goes without saying that the inside of the pipe is thoroughly cleaned before the lining treatment.

(Example) The present invention will be specifically described below based on an example of the present invention shown in FIGS. 1 to 6.

FIG. 1 is an implementation system diagram of the present invention, and FIG. 2 is an explanatory diagram of coating film formation. In the diagram, 1 is a gas pipe, a water pipe,
2 is a fluid pressurizing device such as a compressor or pump, 3 is a pressure regulator, 4 is a flow meter, 5 is an inlet flow rate adjustment valve, 6 is an outlet flow rate adjustment valve, and 7 is a pipe to be treated before a specified length. Lining material discharge valve, 8a, 8b is lining material in the tank, 9a
, 9b is a lining material tank, 10 is a lining material with a higher viscosity injected into the pipe, 11 is a lining material with a lower viscosity injected in front of the lining material 10,
12a, 12b, 13a, 13b, 15a, 15b are valves, and 14a, 14b are pressure regulators.

When lining the inner wall surface of the pipe, if the pipe to be treated 1 is an existing straight pipe, the pipe is first divided into appropriate lengths of about 30 to 30 mm, and the inlet end 1a and outlet end 1b are opened.

In addition, if the wave treatment Go 1 is the I beauty of the branch pipe with increased diameter, the third
As shown in the figure, the end fittings (valve, etc.) 16 are 2 to 10.
One inlet end 1a is opened for each.

Next, connect one device each as shown in FIG.
, 12b are opened and the lining material 10.11 is injected into the inlet end 1a of the target 1. The lining material 10 is a liquid or gel-like material with excellent bilayer properties, high viscosity and easy viscosity adjustment, and has fluidity, and has the properties necessary for a lining material (corrosion resistance, safety gender, etc.)
The one with the following is the best. Specifically, high viscosity (sag limit thickness is approximately 3 to 5 wn) epoxy resin paint, cement-based lining material, etc. are most suitable. In this embodiment, an epoxy resin paint having a sag limit thickness of about 4+++ m is used as the lining material 10.

On the other hand, as the lining material 11 to be injected in front of the lining material 10, it is ideal to use a material that is the same as the lining material 10 and has a slightly lower viscosity. Epoxy resin nH having a thickness of approximately 1.5 ml is used as the lining material 11.

It should be noted that the lining material 10 and the lining material 11 do not necessarily have to be of the same quality, and it is of course possible to use different lining materials 10 and 11 as long as the respective coating films can adhere to each other. It is.

The amount of both lining materials 1.0.11 to be injected into the pipe to be treated 1 is calculated from the length of the pipe, the thickness of the coating to be formed, the diameter of the pipe, etc., and is usually 1° of the required calculation grind. About 1 to 1.2 times as much of the lining material 10 and 11 as the bottle is injected, and the amount of the lining material 11, which has a lower viscosity, is slightly reduced. still,
The lining materials 10 and 11 are introduced into the pipe, as shown in FIG.
Inject the required amount of lining material. Moreover, if the valves 15a15b are opened to slightly pressurize the insides of the lining material tanks 9a and 9b when the lining material is injected, the lining material 8a can be injected.

This is advantageous because the injection of 8b can be carried out more smoothly.

When the injection of lining material 10.11 at point 11 is completed, the inlet flow rate adjustment valve 5 is adjusted to allow pressurized fluid A to flow into the pipe.
At the same time, the outlet flow rate regulating valve 6 is adjusted and opened, and the lining material 10.11 injected into the pipe is pumped to the outlet end at a predetermined speed by the pressure difference ΔP between the front and back of the lining material 10.11. Proceed toward direction 1b. In addition, as the pressurized fluid A to be supplied into the pipe, air, a gas such as nitrous chloride, or watermark can be practically used, and in actual practice, pressure path air from a compressor is used. .

When the pressurized fluid A is supplied into the pipe, the lining material 10.11 injected into the pipe and stored in the form of a plug flows in the direction of the arrow in the form shown in FIG. A lining film 17 that lasts a long time is formed.

According to the test results, the flow velocity U of lining material 10 (sag limit thickness 4 mm, epoxy 1 resin paint) and lining material 11 (sag limit thickness 15 range, epoxy resin paint)
= 0.3 to 3 m/min, diameter 25 to 30
With a pipe of 0 rrrm, a coating thickness of t = 5 to 1 can be obtained, and the pressure difference before and after the lining material 10.11, △P, is about 0.5 to 3 Kg/cd. It is.

Moreover, when the pipe diameter is 25wn, the lining material 10
When moving at a speed of l m/min, the pressure per unit length of the lining material 10.11 is 0.115 ~
0.20)'g/i, and the average coating film thickness at this time was about 2.0 g/i.

In this embodiment, as shown in FIG.
The flow rate adjustment valves 5 and 6 provided on the inlet side 1a and outlet side 1b of the pipe are adjusted so that the flow rate of the lining material 10.
By adjusting the pressure difference between the downstream sides, the moving speed is controlled, and thereby the thickness of the coating film formed is controlled. However, the moving speed of the lining material 10.11 can be adjusted by any method, for example, by opening the outlet side and adjusting the flow rate or pressure of the pressurized fluid A applied from the artificial side by 5.11.
1, or a method in which the inlet pressure of the pressurized fluid A applied from the inlet side is kept constant and the flow rate of the outlet side fluid is adjusted.

In addition, as shown in FIG. 41, a suction device 118 such as a vacuum pump is installed at the outlet end 1b of the buried tube 1 to suck the lining material 10.11 through the pleats 18 and make it flow. Alternatively, the supply of the pressurized fluid A and one suction by the suction device 18 may be used together.

Furthermore, in the actual example, the inlet end 1a of the controlled management l
The lining material 1.0.11 of ``Y'P'' is injected at once at
If the lining material can be injected into the main pipe from each of the branches 1 and 1, move the lining materials P1, Oa, lla, 10b, 11b, etc. at the same time as shown in Fig. 5. By doing so, it is possible to manage a long pipeline at once for the first time.

Further, in this embodiment, the temperature of the pressurized fluid A is not particularly monitored, but the temperature of the pressurized fluid A is controlled by heating or cooling, and thereby the pipe line The thickness of each coat may be adjusted by changing the viscosity of the coating film 17 that is successively formed on the inner wall surface.

FIG. 6 shows the case where the present invention is applied to a branch pipe. First, a predetermined amount of lining material [0.11] is injected into the inlet end 1a, and then the lining material is injected into each valve 16a, 16b.

16c is opened and the lining material 10 is removed by pressurized fluid A.
11 at a predetermined speed up to the first branch point T+.

Next, when the lining material 10.11 reaches the branch point T1 (the arrival time of the lining material 10.11 is calculated from the pressure and flow rate of the fluid A, the pipe diameter, and the pipe length L1), the lining material 10.11 reaches the branch point T1. 11 is branched in two directions, the opening degree of each end valve 16 a , 16 b , 16 c is adjusted to adjust the speed of the lining materials 10 a , 11 a , 10 b , and 11 b flowing through each branch portion to a predetermined value. Adjust directly. In addition, lining material 10.11 at the first branch point TI
As for the amount of separated lining material in the straight pipe direction, it is likely that the amount of lining material in the straight pipe direction will be larger.
l'IM (It is desirable to do so.

In addition, in this embodiment, the amount of lining material required for lining the inner wall of the pipe is determined by calculation, and a slightly larger amount of lining material 10.11 than the calculated amount is injected into the inlet end 1a. . However, when using a lining material that has a small diameter of 1, has a relatively short path length, and has a short curing time, first, use a lining material that is sufficient to approximately fill the inside of the -11f path. and then the end valve of each branch tube], 6 a, 16 b.

16c may be sequentially opened so that the lining material injected by the pressurized fluid A is discharged around i.

According to the 15th method, if the lining material can be reused or used in a continuous manner, it is possible to perform thick lining of the inner wall very easily, highly efficiently, and cheaply. can.

(Effects of the Invention) In the present invention, a lining material with a relatively high viscosity and a lining material with a relatively low viscosity of 1 to 2 are injected into the pipe to close the pipe. Since both lining materials are made to flow together at a predetermined speed using pressurized fluid A, the flow rate of one pressurized flow A that is required is significantly reduced compared to previous lining methods, and energy consumption is reduced. This greatly reduces the capacity of the fluid pressurizing device, making it easier to line large diameter pipes.

Furthermore, since a lining material with a relatively high viscosity is used, a relatively thick coating film with a thickness of about 1 to 5 mm can be easily formed on the inner wall surface of the pipe.

Furthermore, by adjusting the pressure difference between the upper and lower reaches of the lining material flowing in the pipe and changing its moving speed, coating
The thickness can be easily controlled, and a lining skin of a predetermined thickness can be reliably formed, regardless of whether the pipe is a large diameter pipe or a small diameter pipe. Furthermore, it is also possible to improve the mti strength of the pipe by utilizing the formed coating thickness.

In addition, there is no risk of clogging during operation even with small-diameter pipes, and even with large-diameter pipes, it is sufficient to inject the amount of lining material necessary to form a film into the pipe end. Therefore, there is almost no loss of lining material, and economical lining is possible.

Moreover, in the present invention, the lining material 11 with a relatively low viscosity is injected in the front, and the lining material 10 with a higher viscosity than the old one is injected in the rear, and both are integrally injected at a constant speed. Since the flow is directed forward, the coating film formed by the preceding lining material 11 with a relatively low viscosity adhering to the inner wall surface of the pipe is removed by the following lining material 10 with a relatively high viscosity. While being slightly scraped off, the outer surface of the coating film is covered with the coating film of the highly viscous lining material 10, so that sagging of the coating film is completely prevented. As a result, even on curved sections of the pipeline, the coating thickness does not change at all compared to the coating thickness on straight sections, and is uniform over the entire length of the pipeline and maintains a predetermined ratio.・It is possible to form a lining film with a sharp texture.

[Brief explanation of drawings]

FIG. 1 is an example of an implementation system diagram of the present invention, and FIG. 2 is an explanatory diagram of coating film formation. Figure 3 shows the inlet end 1a when lining a small diameter branch pipe.
This shows the arrangement state of the. FIG. 4 is an implementation system diagram according to another embodiment of the present invention. FIG. 5 is an explanatory diagram showing an example of injection of another lining material. Figure 6 shows 1. It is an explanatory view when lining a small diameter branch pipe. FIG. 7 is an explanatory diagram of the state of paint flow at the elbow portion of Japanese Patent Publication No. 58-24195. 1 Lining material 11 with a relatively high viscosity compared to the pipe to be treated 10 Lining material 17 with a relatively low viscosity
Lining film △P Pressure difference A Pressurized fluid patent applicant Japan Technology Development Center Co., Ltd. Representative Kiyonori Niino 1st master Blasphemy correction M (self-motivated) Showa 6
August 1, 198 1, Showing $ Patent application 1986- t≠72 Thea No. 2
, Title of the Invention Method 3 for Linearization of Inner Pipe Wall Surfaces, Relationship with the Case of the Person Making the Amendment Patent Applicant Address 3-7-1, Shoribashi, Higashi-ku, Osaka Name
Legal company Nippon Gishu Kaihatsu 7/Tar representative Shino
Seiki and 1 other person 4, agent address: Kitahama Katano Building, 3-39 Kitahama, Higashi-ku, Osaka (2) Correct "I mAin J r If) m%tix J r" on page g of the specification, line 100.

Claims (9)

[Claims] (1) Place a fluid lining material (10) with a high viscosity and a lining material (11) with a lower viscosity into the pipe to be treated (1) with the lining material (10) with a higher viscosity on the outside. The lining material (11) with low viscosity is positioned inside and injected, and both the lining materials (10) and (1) are injected.
1), the inside of the pipe to be treated (1) is closed, a pressure difference (△P) is generated between both sides of the lining material, and the pressure difference (△P) causes the lining material (10),
By flowing the lining film (11), the lining film (2
) A method for lining an inner wall surface of a pipe. (2) The inner wall surface of the pipe according to claim 1, wherein a pressure difference (ΔP) is generated by the pressurized fluid (A) supplied from one side of the lining materials (10) and (11). lining method. (3) The inner wall surface of the pipe according to claim 1, wherein a pressure difference (ΔP) is generated by reducing the pressure in the inner space of the pipe on one side of the lining materials (10) and (11). Lining method. (4) Pressurized fluid (A) is supplied from one side of the lining materials (10), (11), and the lining materials (10), (
11) By reducing the pressure in the other side space, the pressure difference (△
A method for lining an inner wall surface of a pipe according to claim 1, wherein P) is generated. (5) Lining material (1
0) and (11) are injected. (6) The method for lining the inner wall surface of a pipe according to claim 1, wherein the lining material (10) and the lining material (11) are of the same quality. (7) The method for lining an inner wall surface of a pipe according to claim 1, wherein the lining material (10) and the lining material (11) are different lining materials. (8) While keeping the pressure of the pressurized fluid (A) supplied to one side of the lining materials (10) and (11) constant, the flow rate of the fluid discharged from the other side of the lining materials (10) and (11) By adjusting the lining materials (10) and (11
2. The method for lining an inner wall surface of a pipe according to claim 2, wherein the pressure difference (ΔP) between both sides of the pipe is adjusted. (9) The method for lining an inner wall surface of a pipe according to claim 2, wherein the temperature of the pressurized fluid (A) is higher or lower than atmospheric temperature.