JPH0141100B2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a discharge method for discharging resin that has entered a branch pipe when lining an existing conduit with resin.

[Conventional technology]

Recently, existing conduits such as gas pipes and water pipes running underground have become corroded over time, or the joints of the conduit joints have been damaged by the load of vehicles passing over the pipes, earthquakes, or aging. Since the joint condition changes and can cause leakage, it is being considered to repair the inner surface of the existing conduit or the pipe joint from the inner surface of the pipe while it is still buried, for the purpose of leakage repair or preventive maintenance. . In one type of repair method, for example, as shown in Fig. 1, an existing underground conduit 1 is divided into repair sections L of a length suitable for repair (for example, 100 m), and one separated end 11 is exposed to a shaft A opened above the ground, and the other separated end 12 is exposed to a shaft B similarly opened above ground, and the pig insertion conduit 5 and the pig extraction conduit 6 are connected to these separated ends 11 and 12. , from one of the pig insertion clay pipes 5,
The tow line 4 is passed through the existing conduit 1 and pulled out from the other pig lead-out conduit 6, and the tip of the tow line 4 is wound up with a winch 9, thereby removing the front and rear pairs of tow lines attached to the tow line 4. The pigs 2 and 3 are introduced into the existing conduit 1 with a low viscosity resin C placed in front of the front side pig 2 and a joint sealing resin D placed in front of the rear side pig 3, respectively. A method has been proposed in which the pipe joint 13 of the existing conduit 1 is repaired by filling the gap in the pipe joint 13 with resin D during the process of towing and moving the inside of the pipe from the inlet side to the outlet side.

[Problems to be solved by the invention]

During this repair, the existing conduit 1 is branched with a large number of branch pipes 40 (generally referred to as supply pipes or branch pipes) for guiding the gas passing through the pipe to consumers; Since resin pressure is generated in the resin D moving within the conduit 1 due to viscous resistance generated between the resin D and the inner surface of the tube, when the resin D is pulled and moved within the existing conduit 1, the branch pipe 40
The resin D enters the branch port of the branch pipe 40.
This has the disadvantage of blocking the branch opening. The purpose of the present invention is to discharge the resin that has invaded the branch mouth of the branch pipe 40 during the repair of the existing pipe, but since the work site for repairing the existing pipe is close to a general household, If large-scale equipment such as a compressor is used to discharge the air, there will be problems with the noise of the compressor, safety measures, etc., and it will also be inconvenient to move around the work site. A method for discharging resin that has entered a branch pipe when repairing an existing pipe, using an easy-to-carry air cylinder, which can be easily operated while watching the attached pressure meter, and completely discharging the resin from the branch pipe. This is what we are trying to provide.

[Means to solve the problem]

For this purpose, the present invention connects an air cylinder to a control tank through a pressure reducing valve when discharging the resin that has entered the branch pipe, and connects the control tank to an above-ground surface at the end of the branch pipe. While reading the pressure meter installed after the pressure reducing valve, air is fed from the air cylinder into the branch pipe, and after the meter pressure drops below a certain static pressure. The feature is that the control door is closed after the required time has elapsed.

【Example】

Hereinafter, one embodiment of the method of the present invention will be explained with reference to FIG. 2. First, the apparatus used in this method includes a small air cylinder 1 of about 3 to 4 liters, and a first tank 22 communicating with the air cylinder 1. , a pressure reducing valve 23,
It consists of a second pot 24, connection hoses 25, 26, etc. Then, in response to the repair of the existing conduit 1, a branch pipe 4 is branched from the existing conduit 1 and extends to a general household.
0, the integration meter 28 connected thereto is removed from the branch pipe 40, and the hose 26 is connected to the end of the branch pipe 40. In this state, when the cap of the air cylinder 21 is opened and the first cap 22 and second cap 24 are opened, the pressure air whose pressure has been reduced to about 0.3 kg/cm ² is released through the hose 25, the pressure reducing valve 23, and the hose 26. , is press-fitted into the supply pipe 40. For a while, the pressure meter 27 connected to the pressure reducing valve 23 maintains a static pressure. During this process, the resin that has entered the mouth of the branch pipe 40 is
It is pushed back into the existing conduit 1 by air pressure. When the air in the branch pipe 40 escapes into the existing conduit 1 by pushing back the resin, the meter 27 indicates a pressure drop, but in this state, a considerable amount of resin is still attached to the inner wall of the branch pipe 40. Therefore, supply of pressurized air is continued in this state for about 30 seconds, for example. As a result, when the resin is swept away by the pressurized air flow and the branch opening of the branch pipe 40 is opened sufficiently, the Kotoku 22, 24
Close. This completes the resin discharge work for one branch pipe 40. By repeating this sequentially,
The intruding resin can be sequentially discharged from a large number of other branch pipes 40.

【Effect of the invention】

The advantages of the method according to the present invention are that large-scale equipment such as a compressor is not required, and since the intruded resin is discharged using an air cylinder, there is no noise, and the work is highly safe. Even if the site is close to a home, the work can be carried out without causing problems such as noise pollution. Further, since the small air cylinder 21 is only carried, it is easy to carry each branch pipe to the meter connection point at the end thereof, and the work can be done quickly. This satisfies the requirement that the discharge must be carried out before the resin hardens in the branch pipe, and allows the work of discharging the intruded resin to be carried out efficiently.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing an example of repairing an existing pipe, which is a subject of the present invention, and FIG. 2 is a schematic explanatory diagram showing an example of the method of the present invention. 1...Existing conduit, 2...Front side pig, 3...Rear side pig, 4...Tow rope, 5...Pig introduction conduit, 6
...Pig lead-out conduit, 9...Winch, 40...
Branch pipe, A, B... Vertical hole, C, D... Resin, 21
... Air cylinder, 22 ... Kotoku, 23 ... Pressure reducing valve, 24 ... Kotoku, 25, 26 ... Hose, 2
7...Pressure meter, 28... Integration meter.

Claims (1)

[Scope of Claims] 1. A device for removing resin that has entered a branch pipe branching from the pipe when repairing the inner surface of the pipe or repairing the pipe joint by passing resin into the pipe of an existing pipe, comprising: , communicates with a control tank via a pressure reducing valve, and connects this control tank to a meter connection connected to the above-ground exposed part at the end of the branch pipe, and controls the branch while reading the pressure meter installed after the pressure reducing valve. Intrusion into a branch pipe line during repair of an existing pipe, characterized in that air is forced into the pipe line from the air cylinder and the control cock is closed after a required time has elapsed since the meter pressure has dropped below a certain static pressure. How to discharge resin.