JPS6223488A - Method for lining inner wall surface of pipe - Google Patents

Abstract

PURPOSE:To obtain a uniform film having a desired thickness, by introducing a slider, a low viscosity lining material and a high viscosity lining material into a pipe to be treated from the front side thereof in the advance direction so as to close the pipeline and flowing the same by the pressure difference between the front and rear spaces thereof. CONSTITUTION:Each machinery is connected to a pipe 1 to be treated and a valve is opened to inject lining materials 10, 11 behind a slider 15. After a predetermined amount of said lining materials were injected, both lining materials 10, 11 and the slider 15 are integrally flowed at a constant speed by the pressurized fluid A supplied in the pipe from one side of the lining material 10 or the pressure difference DELTAP generated by evacuating the one side space part of the slider 15. By this method, the film 11' due to the preceding lining material 11 relatively low in viscosity is at first adhered and formed to the wall of the pipe 1 and the lining film 17 due to the lining material 10 relatively high in viscosity is subsequently formed at an almost constant thickness (t) in a laminated or mixed state.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention relates to an improvement of a method for lining inside pipes, and is useful for rehabilitation of buried gas pipes, buried water pipes, etc., and for lining pipes. It is used for manufacturing etc.

(Prior technology) When rehabilitating buried gas pipes or water pipes, a sand jet flow (mixed fluid of abrasive material and air flow) is passed through the pipe to polish the inner wall surface of the pipe, and then the inner wall surface of the pipe is coated with epoxy paint. The method of lining with etc. is generally widely used.

Therefore, the method of lining the inner wall surface of the pipe with paint etc. is as follows: (1) suspending paint particles in a conveying air flow, passing the mixed fluid into the pipe at high speed, and lining the inner wall surface of the pipe during the flow; A method of forming a coating film on the inner wall surface of a pipe by colliding and adhering paint particles (Japanese Patent Laid-Open No. 54-156046)
(Japanese Patent Laid-Open Publication No. 54-127941, etc.), ■ A mixed fluid of paint and air flow is supplied into the pipe, and paint particles are deposited and laminated on the inner wall surface of the pipe inlet, and adhesive particles are deposited on the inner wall surface of the pipe pipe. 1m
A method in which the paint layer is made to flow forward sequentially by the air flow in the mixed fluid, and is coated on the inner wall surface of the pipe to form a coating.
(Japanese Patent Publication No. 8-24195, Japanese Patent Publication No. 58-13226, etc.), ■ Two elastic objects (pigs) are placed in the pipe with a gap of 1, and after filling paint between both elastic objects, the fluid is A method of forming a coating film on the inner wall surface of a pipe by advancing both elastic bodies while holding the coating material under pressure (Japanese Unexamined Patent Publication No. 55-4432)
Publication No. 0, etc.) have been widely used for a long time.

Methods (1), (2), and (2) above are all excellent construction methods, and are actually widely used in the rehabilitation of pipelines in buildings, factories, etc.

However, these methods still have many drawbacks that need to be resolved. For example, in method (2) above, since the mixed fluid emitted from the end of the flute contains multiple paint particles,
Paint loss will be large. In addition, since it takes a long time to form a coating film on the large mouth 1q, it is difficult to efficiently form a coating film for one song.Furthermore, the coating film at the elbow area inevitably becomes thinner, which causes the problem (1). be.

Also, in the method (2) above, the coating film thickness on the inner wall surface of the pipe is
It is extremely difficult to achieve a pipe with a larger diameter than 4B, and the amount of air required increases and a large capacity compressor is required, which is a constraint. Problems such as the fact that the coating film thickness on the elbow portion (elbow portion) becomes extremely thin compared to the straight pipe portion are common.

On the other hand, although method (2) is an advanced method for use in large-diameter pipes, there are still problems to be solved. In other words, a liquid paint with low viscosity is filled between the elastic pigs with a diameter of 211 mm, and they are moved together in the pipe by fluid pressure, etc., so that the paint adhered to the inner wall of the pipe by the rear pig may peel off or It is difficult to form a lining film of 1 mm or more even on straight pipe parts because the lining film is scraped off. ◎At elbow parts, the film is scraped off significantly by the rear pig, so
The lining skin on the inner wall of the curved portion becomes thinner,
Since the two pigs sandwiching the O-lining material are slid together as a unit, their sliding properties are extremely poor and cannot be used in small-diameter pipes or S routes with many curved parts. Because of the scraping off of the lining material by the pig, the thickness of the lining film does not change much even if the moving speed of the pig is changed, and there remain problems such as difficulty in adjusting the film thickness.

(Problems to be Solved by the Invention) The present invention solves the above-mentioned problems in the lining of the inner wall surface of the conduit in the conventional method using a mixture of air and lining material. It is difficult to increase the coating thickness, and from the viewpoint of work efficiency, coating f'3・l+ loss, securing an air supply source, etc., it is difficult to apply it to large diameter pipes. In the method of moving the lining material held between the pigs, there are problems such as the lining film is extremely thin, it is almost impossible to control the film thickness, and it is easy to cause clogging accidents during work. The aim is to solve this problem by providing a wide range of pipelines, from small to large diameter, with a high f/tonne ratio, without the need for a large capacity fluid supply device, and with a chemical thickness of 1 to 5 or more. It is an object of the present invention to provide a method for lining the inner wall surface of a pipe, which makes it possible to line the entire length of the pipe including the elbow portion with uniform coating thickness and uniform thickness.

(Means for Solving the Problems) The present invention involves inserting an elastic sliding body into the treated object 7, and placing a fluid and highly viscous lining material behind the sliding body. A low-viscosity lining material is injected with the high-viscosity lining material placed on the outside and the low-viscosity lining material placed inside, and the inside of the implanted tube is closed with both lining materials, and the lining material is slidable. The basic structure of the invention is to form a lining film by generating a pressure difference between the front space of the body and the rear space of the lining material, and causing the lining material to flow due to the pressure difference. 0 (Function) Both the lining materials and the sliding body injected into the pipe in a state that blocks the inside of the pipe are sequentially kept at a constant speed due to the pressure difference △P between the front and rear spaces of the two lining materials and the sliding body. 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 one that has easy viscosity adjustment, little sagging, excellent bilayer properties, and fluidity. The sliding body is preferably one that has elasticity and has low frictional resistance with the inner wall surface of the pipe.

Due to the occurrence of the difference △P, both the lining materials and the sliding body flow together at a constant speed in the form approximately shown in Fig. 2, and the viscosity decreases relative to the preceding one. As the lining material 11 approaches the inner wall surface of the pipe, the coating film 11 formed is slightly scraped off by the subsequent lining material 10, which has a relatively high viscosity. A lining layer 7 is formed in which the coating is composed of only one coating or a mixture of both lining materials. In addition, when both lining materials contain f% of different substances, a film is formed in which the film of the lining material 11 and the film of the lining material 10 are separated by 62 q.

- Since the outer surface of the coating film 17 is formed by the film of the highly viscous lining material 10, no sagging of the lining material occurs. In addition, since the high-viscosity lining material 10 advances on the coating surface 11, that is, the wet surface formed by the low-viscosity lining material 11, its progress is strained and smooth. The sag on the coating surface 11 of the lining material 11 is removed, and
The outer surface is almost coated with a thin film of the high-viscosity lining material 10, and the film thickness is extremely uniform not only at the straight pipe section but also at the elbow section, and approximately equal to the film thickness of the straight pipe section. A thick coating film 17 is formed. Note that if the lining material 10 or 11 is moved alone, the lining film thickness at the elbow portion will be approximately 2.0 to 2.5 times thicker than that of the straight pipe portion. According to this method, there is no local increase in coating thickness at the elbow.

Further, due to the presence of the sliding body 15, even if the viscosity of the lining material 11 is relatively low, the lining material 11 does not sag forward.

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 3.

FIG. 1 is a diagram of the real circle system 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 phase pressure device such as a compressor or pump], 3 is a pressure regulator, 4 is a flowmeter, 5 is an inlet flow rate adjustment valve, and 6 is an outlet 1. Wkz +q valve, 7 is a lining material discharge valve, 8a and 8b are lining materials in the tank, 9a and 9b are lining material tanks, 10 is the lining material with higher viscosity injected into the pipe, 11 is the lining material 10 Lower viscosity lining material injected in front of L2a, 12b, 13a, 13b, 16a,
17b is a valve, 14a, ], 4b is a child regulator, 15
is a sliding body made of elastic material.

When lining the inner wall surface of the pipe, if the pipe to be treated 1 is one of the existing straight pipes, first divide the pipe into appropriate lengths of about 30 to 500 m, and open the inlet end 1a and outlet end 1b. .

Next, connect each tel device as shown in Figure 1, and valve 1
2a and 12b are opened and the lining material 10.11 is injected into the inlet end 1a of the tube 1 to be treated. The lining material 10 has excellent one-layer properties, is highly viscous, and has fluidity in the form of a liquid or gel whose viscosity can be easily adjusted.Moreover, it has the properties necessary for a lining material (corrosion resistance, Safety, etc.) is optimal. Specifically, epoxy resin paints and cement-based lining materials with high viscosity (thickness limit for sagging is approximately 3 to 5 mm thick) are most suitable. A 4 mm thick epoxy resin paint 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 1o and has a slightly lower viscosity. Membrane thickness is approximately 0.5 to 1.5
An epoxy spacer paint of m 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 as long as their respective coatings have a strong IJ property, they can be of different lining materials 1.
It may be 0.11.

The sliding body 15 is made of a flexible and deformable soft elastic material such as rubber or plastic, and its outer diameter is selected to be slightly smaller than the inner diameter of the tube 1 to be treated. The sliding body 15 prevents the highly viscous lining material 10 from sagging forward.1. f: It is intended to be pushed forward along the tube wall while maintaining a slight frictional resistance between it and the tube wall.

Both lining materials injected into the treatment '171 10.11
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 a lining material of 10. 11 is injected into the lining material 11, which has a lower viscosity. In addition, lining materials 10 and 11 are deposited inside the pipe as shown in the first river, so that the pipe is blocked.
Inject the required amount of lining material. Also, when injecting the lining material, if the valves 15a1.5b are opened to slightly pressurize the insides of the lining material tanks 9a and 9b,
Lining material 8 a.

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

When the sliding body 15 and the required amount of lining material 10 and 11 have been assembled, the inlet flow rate adjustment valve 5 is adjusted to supply pressurized fluid A into the pipe, and the outlet flow rate adjustment valve 6 is adjusted and opened to release the lining material. Due to the pressure difference P between the material and the sliding body, the lining materials 10 and 11'' injected into the pipe are integrally advanced toward the outlet end 1b at a predetermined speed. As the pressurized fluid A to be supplied into the pipe, gases such as air and nitrogen, water, etc. can be used, and in this example, compressed 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 accumulated in a plug-like layer is transferred to the sliding body 15.
While pressing , it flows in the direction of the arrow in the form shown in Figure 2,
Lining film 1 having a substantially constant thickness t on the inner wall surface of the pipe
7 is formed.

According to the test results, the flow velocity U = 0.3 to 3 m/ When m/n, caliber 5
A coating film thickness of t=4 to IWIn can be obtained in a pipe having a diameter of 0 to 600 trrm, and the lining material 10.
The pressure difference before and after 11 is △P is 1~4 Kg/crd
That's about it.

In this embodiment, as shown in FIG.
5.6 Anti-fake and minor valves installed on the inlet side 1a and outlet side 1b of
The thickness of the coating film formed is controlled by adjusting the pressure difference between the upper and lower reaches of the sliding body and lining material moving inside the pipe and controlling the %ftj speed. . However, the moving speed of the sliding body and the lining material 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 inlet side, or by adjusting the flow rate or pressure of the pressurized fluid A applied from the inlet side. Of course, a method may also be used in which the flow rate of the fluid on the outlet side is adjusted while keeping the inlet pressure constant.

Alternatively, a suction device such as a vacuum pump may be provided at the outlet end 1b of the convex surface @1, and the device may suck the sliding body 15 and the lining materials to, 11 and cause them to flow. The supply of the pressurized fluid A and the suction by the suction device may be used together.Furthermore, in the above practical example, a 9% lining material 10 is placed at the inlet end 1a of the pipe 1 to be treated.
．． 11 is injected once, but if there is a case where the lining material can be injected into the main pipe in the middle of the pipe, for example, due to several branches of G-J', the third As shown in the figure, a plurality of sliding bodies 15a, 15b and a lining material 10
a, lla.

By moving 10b,,llb... at the same time,
Extremely long pipelines can be treated at once.

Further, in this embodiment, although the temperature of the pressurized fluid A is not particularly controlled, the temperature of the pressurized fluid A is controlled by heating or cooling. The thickness of the coating film may be adjusted by changing the viscosity of the coatings 17 that are sequentially formed on the wall surface.

(Effect of the invention) In the present invention, a sliding body is inserted into the pipe, and a lining material with relatively high viscosity and a lining material with relatively low viscosity are injected into the pipe to block the Hiko passage. Because both lining materials are made to flow together at a predetermined speed due to the pressure difference between the front and back, even in large-diameter pipes, the lining materials sag forward and the difference between the front and rear lining materials is reduced. There is no loss of pressure △P, and the lining material can be moved extremely smoothly, and even when pressurized fluid A is used, the required current of pressurized fluid A is lower than that of the conventional one. Compared to the lining method, this method significantly reduces energy consumption and reduces the capacity of the fluid pressurizing device, making it especially easy to line large-diameter pipes.

In addition, - since only one moving body is used, it is possible to move the lining material and sliding body to one bone at a time, even though the viscosity of the lining material is much higher than in the conventional pigging method. It is very clean and there is no risk of clogging during the work. Furthermore, even for large-diameter pipes, it is sufficient to inject the amount of lining material necessary to form a film into the pipe inlet end, so there is almost no loss of lining material, making it possible to line the pipe economically. Become.

Moreover, in the present invention, the lining material with a relatively low viscosity is injected in the front, and the lining material with a relatively high viscosity is injected in the rear, and both are integrally directed forward at a constant speed. Because the lining material is made to flow with a relatively low viscosity, the coating film formed by the adhesion of the lining material with a relatively low viscosity to the inner wall surface of the pipe is slightly scraped off by the lining material with a relatively high viscosity that follows. Along with
Since the outer surface of the coating is covered with a coating of high-viscosity lining material, sagging of the coating is completely prevented.

As a result, even at curved sections of the pipe, the coating thickness does not change at all compared to the thickness of the straight pipe, and is uniform over the entire length of the pipe, and is in the range of 1 to 58 mm. A relatively thick lining film can be formed.

In addition, by reducing the pressure difference between the upstream and downstream of the lining material flowing in the pipe and the viscosity of the lining material, the coating thickness can be easily controlled. Even for diameter pipes, it is possible to reliably form a lining film of a predetermined thickness, and it is also possible to improve the mechanical strength of the pipe by utilizing the thickness of the formed coating film.

[Brief explanation of the drawing]

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. FIG. 3 is an illustration showing an example of injection of another lining material. 1 Lining material 11 with relatively high viscosity relative to the pipe to be treated 10 Lining material 17 with relatively low viscosity
Lining film △P Pressure difference A Pressurized fluid patent applicant Japan Technology Development Center Co., Ltd. Representative Kiyonori Niino and one other person Procedures Amendment (self-motivated) August 19, 1986

Claims (9)

[Claims] (1) Slide body (15) with elasticity into the tube to be treated (1)
), and insert the highly viscous lining material (10) having fluidity and the lining material (11) with low viscosity into the rear of the sliding body (15). is placed on the outside and a lining material (11) with a low viscosity is placed inside. A pressure difference (
A method for lining an inner wall surface of a pipe, characterized in that a lining film (17) is formed by generating a pressure difference (ΔP) and causing the lining materials (10) and (11) to flow. (2) A method for lining an inner wall surface of a pipe according to claim 1, wherein a pressure difference (ΔP) is generated by the pressurized fluid (A) supplied from one row of the lining material (10). (3) A method for lining an inner wall surface of a pipe according to claim 1, wherein a pressure difference (ΔP) is generated by reducing the pressure in a space on one side of the sliding body (15). (4) Pressurized fluid (A) from one side of the lining material (10)
2. The method for lining an inner wall surface of a pipe according to claim 1, wherein a pressure difference (ΔP) is generated by supplying the pressure and reducing the pressure in the space in front of the sliding body (15). (5) According to claim 1, the sliding body (15) is inserted from a plurality of locations in the tube to be treated (1), and the lining material (11) and the lining material (10) are respectively injected. A method for lining the inner wall of a pipe. (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) By keeping the pressure of the pressurized fluid (A) supplied to one side of the lining material (10) constant and adjusting the flow rate of the fluid discharged from the front space of the sliding body (15), the pressure can be increased. A method for lining an inner wall surface of a pipe according to claim 1, wherein the difference (ΔP) 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.