JPH0418966A - Method for repairing inside surface of supply pipe - Google Patents

Abstract

PURPOSE:To easily remove the cured resin stagnating in an S tee part by excavating and exposing the S tee part with a supply pipe, fastening an S tee stopper connected to a conduit and a resin recovering jig into the S tee part, mounting a transparent terminal part to the upper part of the S tee part and communicating this part with the supply pipe. CONSTITUTION:The S tee part 3 of the existing small-diameter supply pipe 2 branched from the conduit 1 of a main or branch pipe is excavated to expose the S tee part 3. A closing plug 11 fastened to the upper part of the S tee part 3 is removed and the resin recovering jig 13 is mounted into the above- mentioned S tee part 3. The terminal part 17 mounted with the transparent pipe 16 is screwed to the threaded part 15a of a cylindrical body 14 projecting to the upper part of the above-mentioned S tee part 3. A prescribed amt. of a lining resin is injected in a liquid state into a resin injector 5 and the air for force feeding from a blasting header 6 is controlled in flow rate and is introduced therein, by which the resin liquid is fed into the supply pipe 2 to line the entire length from one direction. The man-hours for application are drastically decreased in this way and the period of the work is shortened.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is applicable to existing pipes such as gas pipes and water pipes installed underground or inside buildings, especially those that are branched from conduits such as main pipes and branch pipes. When forming a resin lining resin on the inner surface of a small-diameter installed supply pipe without cutting the supply pipe in the construction section at the S-cheese section, etc., it is necessary to This invention relates to a repair method for the inner surface of a supply pipe that allows easy removal of resin that has accumulated and hardened in the S-cheese section connected to the supply pipe.

[Prior Art] In general, existing small-diameter supply pipes such as gas pipes and water pipes installed underground or inside buildings are prone to leakage due to corrosion holes and cracks forming in the pipes due to red weather. Therefore, in order to repair the leakage or to prevent the leakage from occurring, it is necessary to form a resin lining coating film on the inner surface of the supply pipe in its installed state at a specified time after construction. Repairs are being carried out.

Various repair methods have been proposed so far. As shown in Japanese Patent Application No. 05270, there is a known prior art technique in which a coating film is formed while moving the resin by applying a pressing force such as compressed air from behind the liquid resin injected into the inner surface of the tube. .

In other words, when repairing a supply pipe using the inner surface repair method as shown in the prior art described above, as shown in FIG. Cut the S-chee lug section (hereinafter referred to as S-chee section) 3, connect the resin injector 5 to the meter standpipe 4 side to inject the resin, and connect the knob 6 to the air blower. Blower 7
1 Generator 8 etc. will be installed to blow air and line the entire length of the pipeline from one direction, and the lining repair of the construction section will be completed when the lining resin flows out from the cut section of the supply pipe 2. was checking.

[Problem to be solved by the invention]

However, in the conventional construction method described above, it is necessary to excavate in advance the S-chee section 3 where the supply pipe 2 is branched from the conduit 1 such as the main branch pipe over a wide range and cut the supply pipe 2 for each construction section, which increases the number of work steps. After the repair method of forming a lining film on the inner surface of the supply pipe 2 is completed, the connecting pipe coated with a new anti-corrosion coating material is ITI'd and the S-chee part 3
There were problems such as the need to join the pipes, the key cost, the number of pipes, the number of pipes, and the cost of the varnish.

The present invention was proposed in Problem No. 12 to address the above-mentioned problems, and is intended to solve the above-mentioned problems by providing a supply pipe within the service-L section for existing small-diameter supply pipes that are branched from conduits such as main pipes and branch pipes. A resin lining coating film is formed on the inner surface of the pipe as it is laid without cutting the pipe at the S-chee section, etc., and it is easy to confirm the completion of the repair in the construction section, and the inside of the S-chee section between the conduit and the supply pipe can be easily confirmed. The purpose of the present invention is to provide a method for repairing the inner surface of a supply pipe by which resin that has accumulated and hardened can be easily removed.

[Means to solve the problem]

To achieve this objective, the present invention provides a repair method for forming a lining coating film of approximately constant thickness on the inner surface of an existing small-diameter supply pipe branched from a conduit such as a main branch pipe. The S-chee part with the pipe is excavated and exposed, and inside the S-chee part there is an S-chee stopper that closes the communication hole with the conduit, and a cylindrical body with a side hole communicating with the supply pipe and an upper end opening. At the same time, tighten the resin 1 to 1 collection jig, attach the terminal part with a transparent pipe attached to the upper part of the S-chie part to communicate with the supply pipe, and pour a predetermined amount from the meter stand pipe side of the supply pipe. This is characterized in that the lining resin is fed under pressure.

[For production]

Based on such a configuration, the repair method for the inner surface of a supply pipe according to the present invention involves excavating and exposing the S-chee portion of an existing small-diameter supply pipe branched from a conduit such as a main branch pipe, and injecting resin into the S-chee portion. Attach the collection jig and connect the terminal end with a transparent tube with a larger diameter than the supply pipe, inject the resin from the meter standpipe side, and let it flow into the pipe with a predetermined pressing force to drain the inner surface of the supply pipe. When the lining resin passes through the S-chie part and reaches the inside of the transparent tube, it can be confirmed that the lining repair of the construction section has been completed.

In addition, after the repair of the convoluted section of the supply pipe is completed,
Remaining and hardened resin can be easily removed by removing the resin recovery jig attached to the S-chie part.

Therefore, according to the present invention, the excavation range of the S-chee portion can be reduced, and there is no need to cut the supply pipe or create a new connecting pipe after repair, while significantly reducing the number of construction steps and the construction period. It is possible to shorten the time and reduce costs.

In addition, the resin that has remained and hardened in the S-chie part after repair is
It can be easily removed by removing the resin recovery jig installed in the chute, and the blockage in the branch communication hole can be eliminated.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a schematic explanatory diagram of a repair method for the inner surface of a supply pipe showing an embodiment of the present invention, and FIG. 2 is an enlarged sectional view showing the main part of FIG. The same reference numerals are given to the parts in the description.

First, the S-chee portion 3 of the existing small-diameter supply pipe 2 branched from the main branch pipe 1 is excavated to expose the S-chee portion 3.

A supply pipe 2 is connected to the S-section 3 of the conduit 1, and an embolus 11 is fastened to the upper part of the S-section 3 for removal.

After removing the embolus 11 of the S-ch part 3, a resin recovery jig 13 having an S-ch stopper 12 fixed to the F end as shown in FIG. 3 is installed inside the S-ch part 3.

The resin recovery jig I3 consists of a cylindrical body 14 inserted into the S-chee part 3, and has an opening 14a at the upper end of the cylindrical body 14, and a supply connected to the S-chee part 3 on the side surface. A side hole 14b having the same diameter as the tube 2 is formed. Further, a flange 14c is provided on the upper part of the cylindrical body 14, which is positioned on the upper end surface of the S-chee part 3, and a flange 15a is provided in the upper and lower positions by sandwiching this flange 1.48.
15b is formed. Furthermore, the S-chee stopper 12 fixed to the lower part of the cylindrical body j4 is made of an elastic material such as rubber, and closes the communication hole 3a between the S-chee part 3 and the conduit 1, thereby preventing the resin from flowing into the conduit 1. It has 1 defense.

On the other hand, after the resin recovery jig I3 is installed in the S-chie part 3, a transparent tube with one end open is attached to the earth part of the cylindrical body 14 from the supply pipe 2. The end portion 17 to which the tube 16 is attached is attached by screwing or the like. A resin injector 5 is provided on the meter standpipe 4 side of the supply pipe 2.
At the same time, connect the blower header 6, blower 71, heavy electrical equipment 8
The entire length of the supply pipe 2 is lined from one direction by installing necessary equipment such as the above and pressure-feeding resin from the meter standpipe 4 side of the supply pipe 2.

Next, to explain the repair method of the supply pipe 2 using the above-mentioned device, first, the S-chee portion 3 of the existing small-diameter supply pipe 2 branched from the conduit l such as the main branch pipe is excavated, and the S-chee portion 3 is removed. expose.

The embolus 1 fastened to the upper part of the S-chee part 3 is
1 is removed, and a resin recovery jig 13 is installed inside the S-cheese portion 3. Now, when the resin recovery jig 13 is rotated and the communicating hole 3a between the S-ch stopper 12 and the guide 7i'1 at the lower end is screwed in, the resin recovery jig 13 is inserted into the side surface of the cylindrical body 14. The hole 14b is oriented in the h direction of the supply pipe 2.

Next, attach the transparent tube 16 to the neck portion 15a of the cylindrical body 14 protruding from the top of the
to screw on. Furthermore, when the resin t+human equipment 5 is connected to the meter standpipe 4 side of the supply pipe 2, a blower header 6, blower 71, heavy electric equipment 8, etc. are installed.

Then, a predetermined amount of lining resin necessary for lining the entire length of the supply pipe 2 is injected in liquid form into the resin injector 5, and the pressurized air from the blower header 6 is introduced while controlling the flow rate. By doing so, a resin flow is sent into the supply pipe 2 and lines the entire length from one direction. This lining resin flows while remaining on the inner surface of the tube due to the adhesion force to the wall surface as it flows while contacting the inner surface of the tube. After the resin group passes through, the remaining resin forms a lining coating film 18 of a required thickness on the inner surface of the tube.

The lining resin used here is a two-component curing resin made by blending a base resin and a curing agent. desirable.

In addition, since the soft part 17 with the transparent layer j6 attached is attached to the upper part of the S1 part 3 that connects the supply pipe 2 and the conduit 1, the liner 2 resin has a transparent f + 6. After applying it to the entire surface and checking the situation,
After the lining resin is finished, only air is allowed to pass through for a certain period of time to form a substantially uniform lining coating on the inner surface of the pipe.

After the lining resin is applied to the inner surface of the supply pipe 2, the S
The resin recovery jig 13 installed in the chi part 3 is pulled out while being rotated in the opposite direction. At this time, the resin that has accumulated and hardened in the cylindrical body 14 of the resin recovery jig 13 can be removed from the surrounding resin and removed from the S-section 3. Then, as shown in FIG. 4, an embolus 11 is fastened to the upper part of the S-chee part 3, and the excavated part is backfilled. Complete things.

As shown in step 2, attach the small-diameter supply pipe 2 and cut the supply pipe 2 in the cutting section using the S-cheese part 3, and then apply the resin lining coating to the inner surface of the pipe while it is still attached. It is possible to easily confirm the completion of the repair within the repair section. Further, the resin that has accumulated and hardened in the S-chee portion 3 can be easily removed, thereby shortening the construction period and reducing construction costs.

〔Effect of the invention〕

As explained above, in the repair method for the inner surface of the supply pipe according to the present invention, the S-chee part of the existing small-diameter supply pipe branched from the main branch pipe or other conduit is excavated and exposed, and the inside of the S-chee part is used for resin recovery. Attach the jig and connect the terminal section with a transparent tube with a larger diameter than the supply tube attached to the upper part of the S-chee section, and inject the required amount of resin from the meter standpipe side with the specified suppressing force. Since the flow progresses inside the pipe and forms a lining coating on the inner surface of the supply pipe, the supply pipe within the construction section is
It is possible to repair the inner surface of the pipe without cutting it at the chi part, leaving it attached.

Also, since a transparent tube was attached to the S-cheese part that connected the conduit and the B supply tube, it is possible to know when the lining resin is finished by applying the lining resin or the transparent tube to the entire surface and checking the flow out. can.

Furthermore, after the lining resin has been applied, the resin that has accumulated and hardened in the S-chee part can be easily removed by removing the resin recovery jig installed in the S-chee part.

Therefore, according to the present invention, compared to the conventional construction method in which the S-chee section of the supply pipe is cut for each construction section, the excavation range of the S-chee section is smaller, and the labor required for cutting the supply pipe and the joining are required. Since man-hours and materials such as new connecting pipes after repair are not required, it is possible to significantly reduce the number of construction man-hours and the construction period, and furthermore, it is possible to reduce construction costs.

Furthermore, it is easy to remove the resin that has accumulated and hardened in the S-cheese portion after repair, and the communication hole of the branch portion will not be blocked.

[Brief explanation of drawings]

Fig. 1 is a schematic explanatory diagram of a method for repairing the inner surface of a supply pipe according to an embodiment of the present invention, Fig. 2 is an enlarged sectional view showing the main part of Fig. 1, and Fig. 3 is a perspective view of a jig for collecting the resin. 4 is a sectional view of the main part of J'J'S after repair-L is completed, and FIG. 5 is a schematic explanatory diagram showing the conventional 1-method. Conduit, 2. Supply pipe, 3. S-chi part, 4. Meta standpipe, 5. Resin injector, 11. Embolization, 12. S-tist soap, 13. Jig for resin collection, ■ 4 Cylindrical body, 16
Transparent tube, 17...Terminal section, 18 Liney coating. Figure 1 Figure 2

Claims (1)

[Scope of Claims] In a repair method in which a lining coating film of a substantially constant thickness is formed on the inner surface of an existing small-diameter supply pipe branched from a conduit such as a main branch pipe, an S-cheese with a supply pipe branched from the said conduit Excavate and expose the resin recovery jig, which consists of an S-chee stopper that closes the communication hole with the conduit pipe, and a cylindrical body having a side hole communicating with the supply pipe and an opening at the top end, inside the S-chee part. In addition, a terminal section with a transparent tube attached to the upper part of the S-chee section is attached to communicate with the supply pipe, and a predetermined amount of lining resin is pumped from the meter vertical pipe side of the supply pipe. A method of repairing the inner surface of supply pipes.