JPS6223483A - Method for lining inner wall surface of pipe - Google Patents

Abstract

PURPOSE:To form a smooth and uniform film, by inserting a slider in a pipe while injecting a high viscosity lining material behind the slider and bringing the pipeline to a closed state before moving the lining material at a predetermined speed by the pressure difference between the parts before and after the lining material. CONSTITUTION:A slider 15 made of a soft elastic material is inserted in a pipe divided in an appropriate length from the opening end thereof and a valve 11 is opened to inject lining material 10 with predetermined viscosity behind the slider 15. As the lining material, for example, a high viscosity epoxy resin paint and a cementitions lining material etc. are used. After the injection of a predetermined amount of the lining material was completed, an inlet flow amount adjusting valve 5 and a temp. regulator 16 are adjusted to supply a pressure fluid A with predetermined temp. while an outlet flow amount adjusting valve 6 is adjusted and opened to allow the lining material 10 to advance toward the direction of an outlet end 1b at a predetermined speed by the pressure difference between the parts before and after the lining material 10.

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 relatively large-diameter buried gas pipes and buried water pipes, and for the manufacture of lining pipes.

(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 Epokin paint. The method of lining with etc. is generally widely used.

Therefore, the method for lining the inside of the pipe with paint etc. is as follows: (1) suspending paint particles in a conveying air flow;
By passing the mixed fluid through the pipe at high speed and causing paint particles to collide and adhere to the inner wall of the pipe during the flow,
Method of forming a coating film on the inner wall surface of a pipe (Japanese Patent Application Laid-Open No. 54-1560
No. 46, JP-A-54-127941, etc.), ■
A mixed fluid of paint and air flow is supplied into the pipe line, paint particles are allowed to adhere to the inner wall surface of the pipe inlet, and a paint layer with an adhesion area of 51 is sequentially formed on the inner wall surface of the puff channel by the air flow in the mixed fluid. Method of forming a coating film on the inner wall surface of the pipe by blowing with a forward flow (Japanese Patent Publication No. 58-24195, 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.) have been widely used.

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 leave many problems that need to be resolved. For example, in method (2) above, a large amount of paint particles are contained in the mixed fluid discharged from the end of the pipe, resulting in a large loss of paint. Furthermore, since it takes a long time to form a coating on a large-diameter pipe, it is difficult to efficiently form a thick coating, and there is also the problem that the coating on the elbow portion inevitably becomes thin.

Also, in the method of
m or more is extremely difficult, 4BJJ,
If it becomes a large diameter pipe F, the amount of air required increases and a large capacity compressor is required, which is a constraint, and the coating thickness at the curved part (elbow part) It is much thinner in comparison (the neck between the tubes is still intact).

On the other hand, although method (2) is an excellent method for relatively large-diameter pipes and pigeon lofts, there are still problems to be solved. In other words, ① A liquid paint with low viscosity is filled between two elastic pigs, and they are moved together in the pipe by fluid pressure, etc., so that the IF paint adhered to the inner wall of the pipe by the rear pig is removed. This results in peeling or scraping, making it difficult to form a lining film of 1 m or more even on straight pipe sections. As a result, the lining film on the inner wall surface of the curved part becomes particularly thin.
Since two pigs with O lining material sandwiched between them slide together as a unit, the sliding properties are extremely poor and it cannot be used for small-diameter pipes or pipes with many curved parts.■ Lining with the rear pig Due to the scraping of the material, the thickness of the lining film does not change much even if the moving speed of the pig is changed, and problems remain, such as difficulty in controlling the film thickness.

(Points to be Solved by the Invention) The present invention is directed to the above-mentioned interstitial layer in the lining of the inner wall surface of this type of pipe, i.e., in the method using a mixture of air and lining material, It is difficult to increase the thickness of the paint film on the wall surface, and it is difficult to apply it to large diameter pipes from the viewpoints of work efficiency, paint loss, securing an air supply source, etc. In the method of moving the lining material held between the linings, the lining film is extremely thin, it is almost impossible to control the film thickness, and problems such as clogging and accidents are likely to occur during work cannot be solved. It is designed to handle all types of pipelines from small diameters to large diameters with high efficiency.
1-1 without requiring a large capacity fluid supply device.
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 part to a desired uniform thickness with a relatively thick coating film thickness of 5 van or more. It is something to do.

(Means for Solving the Problems with Problems) The first aspect of the present invention is to insert a sliding body having elasticity into a pipe to be treated, and to apply a high viscosity of 1<IE to the rear of the sliding body. The inside of the tube to be treated is closed and thinned by the lining material, and a pressurized fluid at a temperature different from the atmospheric temperature inside the tube to be treated is supplied from -11 of the lining material. The basic structure of the invention is to form a lining skin or a patch by causing the lining material to flow or force.

In addition, the first invention of the present application inserts a sliding body having elasticity into the wave management pipe, and injects a lining material having high viscosity and fluidity behind the sliding body, and the lining material covers the pipe to be treated. After closing the inside of the lining material, supplying a pressurized fluid at a temperature different from the atmospheric temperature in the pipe to be treated from one side of the lining material, and reducing the pressure in the space on the other side of the lining material to cause the lining material to flow. Accordingly, the basic structure of the invention is to form a lining film.

(Function) The sliding body inserted into the pipe and the lining material injected to close the pipe are sequentially moved at a constant speed by the pressure difference △P between the front and back of the lining material, A lining film is formed on the inner wall surface of the pipe through which the lining material has 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 the viscosity of the lining material.

The optimal lining material is a material that has a relatively high viscosity, can be easily adjusted, has little "sag", and has fluidity. Further, as the sliding body, it is preferable that it has elasticity and has low frictional resistance with the inner wall surface of the pipe. The sliding body prevents the lining material 10 from flowing forward and improves the bilayer properties of the lining material. the result,
The flowing lining material is more strongly pressed against the inner wall of the pipe, improving the adhesion of the coating film.

Therefore, when the temperature of the pressurized fluid A supplied from one side of the lining material is set to a high temperature, the viscosity of the lining material is relatively high (for example, if the sagging limit thickness of the coating film is 3 to 5 Individual)
be selected. Since the viscosity of the paint is relatively low, a coating film with a uniform thickness of 1.5 to 35 mm is formed on the straight pipe section.

On the other hand, in the elbow part, the temperature of the pressurized fluid is low, and the coating thickness is about 2 to 3 times that of the straight pipe part. This is because due to the high flow resistance at the bend, the flow rate decreases and the coating stagnates. However, in the present invention, since the pressurized fluid A is kept at a high temperature, the coating film formed on the +2 surface inside the tube is heated by the pressurized fluid, and its viscosity decreases. As a result, the formed coating film is easily stretched forward, and due to retention in the elbow portion, the coating film becomes thinner (thinner) to a thickness approximately equal to that of the straight pipe section. When the temperature of the pressurized fluid A supplied from one side of the lining material is set to a low temperature, the viscosity of the lining material is set to be slightly lower (for example, the sag limit thickness of the coating film is about 05 to 2.5 mm). viscosity).

When the temperature of the pressurized fluid A is lowered, the coating film formed on the inner wall surface of the pipe is cooled thereby, and the viscosity of the coating film increases, causing sagging and becoming frizzy. As a result, the coating film on the straight pipe part becomes uniform in thickness of about 10 to 3 mm, and a thin coating film that is almost the same as that on the straight pipe part is also formed on the elbow part. .

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

(Example) Hereinafter, the present invention will be specifically described based on an example of the present invention shown in FIGS. 1 to 4.

FIG. 1 is an implementation system diagram of the first invention of the present application, and FIG. 2 is an explanatory diagram of coating film formation. In the figure, l is a pipe to be treated such as a gas pipe, water pipe, or fixed length pipe, 2 is a fluid pressurizing device such as a compressor or pump, 3 is a pressure regulator, 4 is a flow meter, and 5 is a Inlet flow rate, ;% regulating valve, 6 is outlet flow rate regulating valve, 7 is lining material discharge valve, 8 is lining material in the tank, 9
10 is the lining material tank, 10 is the lining material injected into the pipe, 11φ12 and 13 are the valves, 14 is the pressure regulator, 15 is the sliding body made of elastic material, 16 is the temperature of the air cooler, air heater, etc. 71 It's Reiki.

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 500 m, and the inlet end 1a and outlet end 1b are opened.

Next, connect each device to the broom 1 as shown in Figure 1, insert the sliding body 15 inward from the open end of the pipe 1, open the valve 11, and apply a lining material of a predetermined viscosity to the rear of the sliding body 15. Inject 10. The lining material 10 is a highly viscous liquid or gel that has excellent storage properties, has fluidity, and has the characteristics necessary for a lining material (corrosion resistance, safety, etc.). The one with the following is the best. Specifically, high viscosity (the sagging limit thickness of the coating film is 05 to 5
Epoxy, resin paints, and high-viscosity cement-based lining materials are nd.

In this example, the sagging limit thickness is 4 epoxy resin paints (pressurized fluid temperature: 45°C, atmospheric temperature: 25°C).
) and epoxy four-finger paint with a sag limit thickness of 15 (pressurized fluid temperature 5°C, atmospheric temperature 25°C) as lining material 1.
It is used as 0.

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 a excitation body 15 is a highly viscous lining material 1
This is to prevent the 0 from sagging forward, and is pushed forward along the tube wall while maintaining a slight frictional resistance with the tube wall.

The amount of lining material 10 to be injected into the pipe to be treated 1 is calculated based on the length of the pipe, the thickness of the coating to be formed, the diameter of the pipe, etc., and is usually about 1.1 to 12 times the required calculation amount. The amount of lining material 10 is injected. A necessary amount of lining material is injected into the pipe so that the lining material 10 is accumulated in the pipe as shown in FIG. 1 and the pipe is closed.

At this time, it is convenient if the valve 13 is opened to slightly pressurize the inside of the lining material tank 9, since the lining material 10 can be injected more smoothly.

When the injection of the required snow lining material 10 is completed, the inlet flow'! ? Adjust the lowering valve 5 and the temperature regulator 16 to a predetermined value.
+! While supplying the pressurized fluid A into the pipe, the outlet flow rate is adjusted and opened by the regulating valve 6, and the pressure difference ΔP between the rear of the lining material 1o and the front of the sliding body 15 causes the fluid A to be injected into the pipe. The lining material 10 is advanced toward the outlet end 1b at a predetermined speed. Pressurized fluid A supplied into the pipe/lj
As the fluid, gases such as air and nitrogen, water, etc. can be used, and in this example, compressed air from a compressor is used.0 When pressurized fluid A is supplied into the pipe, it is injected into the pipe. The lining material 10 accumulated in a plug-like layer flows in the direction of the arrow as shown in FIG.
is being formed. At this time, since the sliding body 15 is present in front of the lining material 10, large diameter pipes (for example, 5B to 5B) are present in front of the lining material 10.
15B), the lining material 10 sag forward and the differential pressure ΔP between the front and rear of the lining material 10 is not lost at all, and the lining material 10 is moved very smoothly in the state shown in FIG. can be moved.

That is, in the case of a combination of high temperature pressurized fluid A and relatively high viscosity lining material 10, the coating film 10b is sequentially stretched forward to form a coating film 10b with a constant thickness t. I'm going to be done. Furthermore, in the case of a combination of the low-temperature pressurizing fluid A and the lining material 10 having a relatively low viscosity, the formed coating film is cooled and its viscosity increases, thereby preventing the coating film from sagging. As a result, a coated film tob having a constant thickness t is successively formed.

According to the test results, the temperature of pressurized fluid A is 45°C to 50°C.
C Atmospheric temperature 20-25° C1 Flow rate of lining material 10 (sag limit thickness 4 mm, epoxy resin paint) U =
When the speed is 0.3 to 3 m/min, a coating film thickness between t = 4 and 1 can be obtained with a pipe having a diameter of 50 to 600 mm.
In addition, the pressure difference △P between the front and rear of the lining material 10 is 1 to 4K.
g/crA.

In this first and only example, as shown in FIG.
By adjusting the pressure difference between the upstream and downstream sides of the lining material 10 traveling inside the pipe, the moving speed of the lining material 10 is controlled, thereby controlling the thickness of the coating film formed. However, the moving speed of the lining material 10 can be adjusted by any method, for example, by opening the outlet side and adjusting the flow 1 or pressure of the pressurized fluid A applied from the inlet side, or by adjusting the pressure of the pressurized fluid A applied from the artificial side. Of course, a method may also be used in which the inlet pressure of A is kept constant and fiEffi of the outlet side fluid is adjusted.

Further, in the embodiment, the inlet end 1a of the Wl to be processed is
The required amount of lining material 10 is injected at once, but as shown in FIG. 10a... may be made to proceed at the same time. In the case where the lining material can be injected into the main pipe and the sliding body can be taken in and out from the middle of the pipe, for example, from a plurality of branch pipes, a plurality of lining materials 10a are used as shown in FIG.

10a... and the sliding bodies 15a, 15a..., an extremely long pipe can be processed at one time.

FIG. 4 is a system diagram according to an embodiment of the second invention of the present application,
A suction device 17 such as a vacuum pump is installed at the outlet end 1b of the tube to be treated l.
is provided, the lining material 10 and the sliding body 15 are suctioned by the suction device 17, and the lining material 10 is
and causes the sliding body 15 to flow.

In the second invention, the sliding body 15 can move more smoothly, and even a pipe line with many curved parts can be easily lined. Furthermore, since the driving source for the lining material 10 and the like is divided into two, the fluid pressure pressurizing device 2 can be made smaller, and the flow rate of the lining material (ie, coating film thickness control) can be controlled more accurately.

(Effects of the Invention) The present invention provides many excellent effects as described below.

■ A sliding body is inserted into the pipe, and a highly viscous lining material is injected behind it, and the lining material is moved at a predetermined speed by the pressure difference between the front and back of the lining material, which forms a vertical line that blocks the pipe. Therefore, even if the pipe has a large diameter, the lining material will not sag forward and the differential pressure ΔP across the lining material will not be lost, and the lining material can be moved extremely smoothly.

Since the pipe line t is closed with the lining material, the required KIJt of the pressurized fluid A is significantly reduced compared to the previous lining method, and the energy consumption is significantly reduced, as well as the fluid pressurization device. Capacity can be reduced and large diameter pipes can be easily lined.

■ Because a high-viscosity lining material is used and a space is created behind the lining material, a relatively quick coating film of about 1 to 5 cm thick can be easily formed on the inner wall surface of the pipe. The coating thickness does not change at all even at curved portions of the pipe, and a uniform and thick lining film can be formed over the entire length of the pipe.

- Since only one sliding body is used, the lining material and sliding body can be moved extremely smoothly, even though the viscosity of the lining material is much higher than in the conventional pigging method.

■ By adjusting the pressure difference between the upper and lower reaches of the lining material flowing in the pipe and changing its movement speed, the coating film thickness can be easily controlled, even on large-diameter pipes or small-diameter pipes. Even for 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.

■ Even for large-diameter pipes, it is sufficient to inject the amount of lining material necessary to form a film into the pipe, so there is almost no loss of lining material, making it possible to line the pipe economically. Become.

■ By raising the temperature of the pressurized fluid A to a high (or low) temperature and heating (or cooling) the coating film itself that is formed on the inner wall surface of the pipe by the pressurized fluid A, changing the viscosity of the coating film.
This is to prevent the paint film from stretching forward or sagging.

As a result, local increases in the lining film thickness due to stagnation of the paint film (or sagging of the paint film) at the elbow part are completely prevented, and the thickness of the lining film at the elbow part is almost the same as that of the straight pipe part. It is possible to form a coating film with a thickness of .

[Brief explanation of drawings]

FIG. 1 is an example of an implementation system diagram of the second invention of the present application, and FIG. 2 is an explanatory diagram of the Han formation. FIG. 3 is an explanatory diagram showing an example of injection of another lining material. FIG. 4 is an example of an implementation system diagram of the second invention of the present application. 1 Tube to be treated 10 Lining material + 01) Lining film] 5 Sliding body 16 Temperature regulator 17 Suction device A Pressurized fluid patent applicant Japan Technology Development Center Representative Kiyonori Arata ) August 19, 1985 1, Incident') Display frame Ws 1986-14-12"h
'y2, Title of invention Lining method for pipe inner wall f 3
, Relationship to the case of the person making the amendment Patent applicant Address 3-7-1 Takayobashi, Higashi-ku, Osaka Name
Japan Technology Development Center Co., Ltd. Representative Nii No
Nori Kiyoshi and 1 other person 4, Agent address: 6 Kitahama Katano Building, 3-39 Kitahama, Higashi-ku, Osaka, Supplementary subject matter: "Detailed Description of the Invention" column 7 of the description, Contents of the amendment

Claims (6)

[Claims] (1) Slide body (15) with elasticity into the tube to be treated (1)
), and at the same time injecting a lining material (10) with high viscosity and fluidity to the rear of the sliding body, closing the inside of the tube to be treated (1) with the lining material (10), and By supplying a pressurized fluid (A) at a temperature different from the atmospheric temperature in the tube to be treated (1) from one side of the lining material (10) to flow the lining material (10),
A method for lining an inner wall surface of a pipe, the method comprising forming a lining film (10b). (2) The method for lining an inner wall surface of a pipe according to claim 1, wherein the temperature of the pressurized fluid (A) is higher than the atmospheric temperature inside the pipe to be treated (1). (3) The method for lining an inner wall surface of a pipe according to claim 1, wherein the temperature of the pressurized fluid (A) is lower than the atmospheric temperature inside the pipe to be treated (1). (4) Slide body (15) having elasticity into the tube to be treated (1)
), and at the same time injecting a lining material (10) with high viscosity and fluidity to the rear of the sliding body, closing the inside of the tube to be treated (1) with the lining material (10), and The pressurized fluid (A) at a temperature different from the atmospheric temperature inside the tube to be treated (1) is supplied from one side of the lining material (10), and the space on the other side of the lining material (10) is depressurized to perform lining. By fluidizing the material (10),
A method for lining an inner wall surface of a pipe, the method comprising forming a lining film (10b). (5) The method for lining the inner wall surface of a pipe according to claim 4, wherein the temperature of the pressurized fluid is higher than the atmospheric temperature in the pipe to be treated (1). (6) The method for lining an inner wall surface of a pipe according to claim 4, wherein the temperature of the pressurized fluid (A) is lowered to lower the atmospheric temperature within the pipe to be treated (1).