JPS6330134B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for lining underground pipelines, such as gas pipelines, water pipelines, or underground pipelines for power lines or communication lines, for the purpose of repair or reinforcement. It is something.

Conventionally, this type of lining method involves inverting a flexible cylindrical lining material using pressure fluid such as compressed air, inserting this lining material into the pipe, and then applying adhesive that has been previously applied to the inner surface of the lining material. Add the agent to warm water,
Cured by heating with a heat medium such as steam or hot air,
A method of lining the pipe by adhering the lining material to the inner surface of the pipe through an adhesive is known. This method does not require digging up the entire pipe, and allows long pipes to be reliably lined in a short period of time, and is a method that has received particular attention in recent years.

As mentioned above, this method uses a heat medium to heat and harden the adhesive to form the inner lining, and has the advantage of requiring a short working time. However, this method is also uneconomical for large-diameter pipes with a pipe diameter of 400A or more because it requires a large amount of thermal energy to heat the entire pipe, resulting in an increase in boiler capacity and a decrease in heating efficiency. This has led to problems such as increased work time and increased work time. In addition to the method described above, there is a method in which the adhesive is not cured by heating but is cured at room temperature. Conventionally, this room-temperature curing method does not require a heating medium and is a method with great cost advantages. However, due to the construction method, it is necessary to pinch the lining material on the reaching side with pinch fittings after the lining material is turned over, and then to attach a tube end airtight fitting. This kind of work can be done easily if the pipe is 300A or less, but
If the pipe capacity is 300A or more, the fittings themselves will also be large.
This is extremely difficult to work with, and it is also difficult to make it completely airtight. Therefore, we devised the lining method of the present invention, which cures a reaction-curing adhesive at room temperature, and which allows easy work on pipes with large diameters, thereby saving energy costs required for heating. It also has the advantage of being easy to work with. In particular, in the present invention, the pipe end of the pipe on the reaching side of the lining material has a cylindrical part whose inner diameter is approximately equal to the inner diameter of the pipe pipe, and a lid part is attached to one end to prevent the folded part of the lining material from advancing. and
Moreover, a cap body having an opening is connected and fixed to the lid part with a certain gap therebetween. After the folded part of the lining material reaches the lid of the cap in the pipeline installed in this condition, the cylindrical body is heated to harden the adhesive located inside the cylindrical body, and then the cap is closed. It is characterized by blocking the body opening and making the cylindrical body airtight to prevent pressure fluid from escaping from the rear end of the lining material.

The present invention will be explained in detail below with reference to Examples. Figure 1 shows lining material 1 with adhesive pre-applied.
FIG. 2 is a schematic diagram showing a method of lining the pipe line 2 with A cap body 3 is connected and fixed in advance to the pipe end 2' of the pipe line 2 on the side where the inner resilient material 1 reaches, with a gap of a certain distance, by a connecting tool 3a. The cap body 3 is formed of a cylindrical portion 3' whose inner diameter is approximately equal to the inner diameter of the conduit 2, and a lid portion 3'' at the tip for preventing the folded portion of the lining material 1 from advancing. An opening 5 is formed in the center. Here, the inner diameter of the cap body 3 is said to be approximately the same as the inner diameter of the conduit 2, but specifically, it is larger than the outer diameter of the lining material 1 and slightly smaller than the outer diameter of the lining material 1 at the time of reverse pressure. It's good to have. The length of the cap body 3 should be at least long enough to maintain airtightness after the lining material 1 is bonded, and there should be enough space to wrap the heater 12 around the outer circumference.
Approximately 30cm is sufficient. Also, this cap body 3
It is sufficient that the gap between the pipe end 2' of the pipe line 2 and the pipe end 2' of the pipe line 2 is enough to cut the gap between the two with a cutter or the like after the lining material 1 is installed. After connecting and fixing the cap body 3 to the tube end 2' in this way, the lining material 1 coated with a reaction curing adhesive in advance is attached to the pressure vessel 6.
It passes through the slit 6' provided in the guide pipe 7 and is fixed to the annular fixing part 8 at the tip. When pressure fluid is introduced into the pressure vessel 6 through the pressure fluid inlet 6'', the lining material 1 is folded and turned inside out in the pipe line 2 so that the inside becomes the outside, and the guide that has been inserted into the lining material 1 in advance is removed. It is guided by the pulling machine 4 through the opening 5 of the cap body 3 by the string-like material 9, and the reversal progresses to the cap body 3, and the reversal stops when it collides with the lid portion 3''. FIG. 2 shows a detailed view of the arrival side when the reversal stops at the cap body 3. Normally, the length of the lining material 1 is longer than the length of the pipe line 2, and when the folded part hits the cap body 3 and the reversal stops,
A portion of the uninverted lining material 1' remains inside the immediately inverted lining material 1''. Also, as shown in Fig. 2, a speed control cord is used to perform the inversion at a constant speed. 10 is connected to the rear end of the uninverted lining material 1' together with a guiding string by any method.It is desirable that this connection part be completely airtightly connected using an adhesive such as latex. However, pressure fluid inevitably escapes from the gap between the jackets.In addition, in this construction method, as mentioned above, the lining material 1 is drawn into the pipe line 2 through the slit 6' of the pressure vessel 6, so Since the air in the lining material 1 gradually accumulates toward the rear side at the slit 6', it is necessary to release the air at the above-mentioned connection part.For this reason, this connection part is connected by a simple method. The pressure fluid inside the lining material 1 is likely to leak from the inversion folded part 11, making it difficult to make the inside of the lining material 1 airtight.Therefore, in the present invention, after the inversion is completed, the pressure fluid inside the lining material 1 is attached to the surface of the cap body 3. The cap body 3 is heated by a certain heater 12, and the adhesive 13 inside the cap body 3 is cured before the adhesive 13 on the pipe line 2 side.In this state, the pressure fluid is still escaping from the folded part, but the cap body 3 and the lining material are 1 is completely airtight.Next, the guide belt 9 is cut near the opening 5, and the opening 5 is closed with a suitable closing means such as a blind plug 14, thereby removing the lining material. The pressure fluid inside 1 is in a completely airtight state with no fear of leaking out of the cylindrical body 3. This state is shown in Fig. 3. In this way, the cap body 3 and the lining material 1 are bonded and hardened first. By closing the opening 5, the pressure fluid leaking from the inverted folded part 11 has no place to escape, and eventually becomes the same pressure as the inside of the lining material 1, eliminating the risk of leaking out of the cap body 3. Even if pressure fluid leaks from between the cap body 3 and the lining material 1, the gap is provided between the cap body 3 and the pipe line 2, so the pressure fluid will not spread throughout the pipe line. While this work is being carried out on the arrival side, the following work is also being carried out on the departure side.A detailed view of the departure side is shown in Figure 4. is an annular L-shaped fixing fitting 15 and a sleeve-shaped airtight fitting 1 following it.
6 is connected, and the airtight fitting 16 is connected and fixed to the guide hose 7. Further, a shutter 17 and a pressure fluid injection pot 18 are attached to the airtight fitting 16. After the inverted folded part collides with the cap body 3, the guide hose 7 side and the conduit 2 side are shut off together with the string-like object 10 by the shutter 17,
8, the guide hose is removed while keeping the pressure in the pipe constant, and after cutting the string 10, a cylindrical cap 19 is attached to the airtight fitting 16. After that, the shutter 17 is opened and the pressure inside the lining material is adjusted by the cock 18. As described above, pipe line 2
Reduce the pressure inside the lining material 1 lined with 18
1 to 1 until the adhesive hardens at room temperature and the lining material 1 is attached to the pipe line 2 while maintaining a constant state by
Leave it for 2 days.

As described above, the present invention connects the cap body to the conduit on the reaching side, turns over the lining material, and then heats only the cap body to first harden the adhesive inside the cap body and close the opening. This can prevent leakage of pressure fluid from the folded portion to the outside. Further, even if the pressure fluid were to leak to the outside through the cap, the gap between the cap and the conduit prevents the pressure fluid from going around the entire length of the conduit.

Next, although the present invention can achieve great effects in large-diameter pipes of 300A or more, it is also possible to implement the present invention in pipes with a diameter of 300A or less. Particularly for pipes of 300 A or more, the present invention greatly simplifies the work and eliminates the need for thermal energy to heat the entire pipe, so it can be said to be an economically superior construction method.

[Brief explanation of the drawing]

Figure 1 is a process diagram for reversing and installing the lining material onto the pipe, Figures 2 and 3 are explanatory diagrams of the structure and its effects on the delivery side, and Figures 4 and 5 are the structure and its effects on the sending side. FIG. 1...Lining material, 2...Pipe line, 3...Cap body, 5
...opening part, 10...inverted folded part, 11...room-temperature curing adhesive.

Claims (1)

[Scope of Claims] 1. After applying a reaction-curing adhesive to the inner surface of a cylindrical lining material, the lining material is inserted into the pipe from one end of the pipe while being turned over by fluid pressure, and the fluid pressure is applied to the inner surface of the pipe. In a method of lining pipes in which the adhesive is cured at room temperature while the adhesive is applied at room temperature to adhere the lining material to the inner surface of the pipe, the inner diameter of the pipe is set at the end of the pipe on the side where the lining material reaches. There is a cylindrical part approximately equal to the inner diameter and a lid part at one end of the cylindrical part to prevent the folded part of the lining material from advancing. After the folded part of the lining material reaches the inside of the cap body, the cap body is heated and the adhesive around the folded part located inside the cap body is replaced with the adhesive located inside the pipe line. 1. A method for lining a conduit, which is characterized by curing the lining material beforehand, then closing the opening, and curing the lining material at room temperature while maintaining pressure within the lining material. 2. By inserting a string-like long object over the entire length of the cylindrical lining material in advance, and turning it over with fluid pressure, pulling the string-like long object protruding from the inside-out part through the opening of the cap body, the pipe line is A method for lining a pipe according to claim 1, characterized in that a lining material is inserted into the inner surface and bonded thereto.