JPH0128279B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for repairing joints of existing pipes such as gas pipes, water pipes, etc. buried underground.

Conventional techniques and their problems Conventionally, as a repair method for existing pipe joints, existing pipes with joints that are presumed to be leaking are
For example, 50 to 100 work openings with an opening width of about 2 m.
There is a method of repairing all joints of the pipe to be repaired (usually located at intervals of 5 to 10 m) from the inside of the pipe, regardless of whether there is a leak or not. Proposed. This type of repair method is attracting attention because it can shorten the construction period and save construction costs compared to the so-called open-cut method, which detects the joint where the leak has occurred from outside the pipe and repairs it by excavating it. However, in this type of repair method, since the pipe to be repaired is usually around 100m long,
If water or gas is cut off during this period, the water or gas supply will be cut off over a very wide area, causing inconvenience to many households.

An object of the present invention is to provide a repair method that can efficiently repair an existing pipe joint from the inside of the pipe while maintaining gas or water flow.

Means for Solving the Problems The present invention provides a repair method for repairing joints of existing pipes using a repair device that is sent into the pipe through a work opening provided in the pipe under an operation outside the pipe. When forming a working opening in the existing pipe, first, a bypass pipe is attached to the working opening forming part of the existing pipe, and while the flow state of the existing pipe is maintained, the inside of the pipe on both sides of the working opening forming part is The pipe is sealed off with a blocking member such as an air bag, and then a work opening is created by cutting between the blocking members, and then a separate pipe is installed at the pipe opening of the existing pipe to be repaired facing the working opening. A terminal pipe having a storage space for the repair device is connected between the pair of front and rear fully open and fully closed valves, and the blocking member of the pipe port is removed with at least one of the valves closed. Then, store the repair device in the space with the front valve closed and the rear valve open,
Next, a repair device is sent into the existing pipe with the rear valve closed and the front valve open, and the pipe joint portion is repaired while maintaining fluid circulation in the pipe through a through hole formed in the repair device. Pertains to repair methods for existing pipe joints.

Effect According to the construction method of the present invention, the existing pipe to be repaired is separated from the existing pipe not to be repaired by forming the work opening, but both ends of the existing pipe to be repaired are connected in advance through a bypass pipe before forming the working opening. Since the pipe is connected to the existing pipe that is not subject to repair on both sides, gas (or water) cannot be passed through the existing pipe that is subject to repair, regardless of the formation of the work opening.
held in state.

Furthermore, repair equipment for repairing pipe joints is
Through the terminal pipe connected to the existing pipe to be repaired, the pipe is installed in the existing pipe in a substantially airtight (or watertight) state by using the opening and closing operations of a pair of fully open and fully closed valves installed in the front and rear of the terminal pipe. Since the pipe is inserted and installed, the existing pipe can be maintained in a gas (or water) state even during this insertion and installation work.

Furthermore, since the repair device has a through hole penetrating in the pipe axis direction, gas (or water) can be maintained in the existing pipe while the repair device is moved within the existing pipe and the joint is being repaired.

According to the method of the present invention, gas (or water) is maintained in the existing pipe throughout the process of forming the work opening, inserting and installing the repair device into the existing pipe to be repaired, moving the repair device within the pipe, and repairing the joint. Therefore, the repair device can repair the pipe joint while continuing to supply city gas, tap water, etc. to each consumer.

Embodiment An embodiment of the construction method of the present invention will be described below based on the accompanying drawings.

When implementing the construction method of the present invention, first
As shown in the figure, both sides of the part of the existing pipe 1 where the work opening is planned to be formed are connected by a bypass pipe 11, and two parts of the existing pipe 1 between the bypass pipe 11 are used to inflate an air bag 2 within the pipe. Then, as shown in FIG. 2, the space between the air bags 2, 2 is cut to form a working opening 3 in the shaft. Two air bags 2 may be provided in parallel to improve the sealing performance when the air bag 2 is used to close the air bag. Such formation of the working port 3 can be carried out without interfering with the flow within the existing pipe 1 at all, since both sides of the working port 3 are connected in advance by the bypass pipe 11. Usually, two such working openings 3 are formed at an interval of about 50 to 100 m, including at least one joint part 4, but depending on the construction conditions, there may be only one working opening 3. In the figure, 12 is a bypass pipe of the working port 3' on the other side.

Next, as shown in FIG. 3, the ends of the pipe 1a to be repaired between the working ports 3 and 3' and the pipes 1b and 1b not to be repaired located opposite thereto are each terminal-treated.

As shown in the right part of FIG. 3, at the starting end side working port 3, a terminal pipe 5 is connected to the pipe port of the pipe 1a to be repaired, and both ends of the terminal pipe 5 are connected to the pipe port 1a. are equipped with fully open/close type pinch valves 6, 6' of fluid control type, respectively, and these valves 6, 6'
A space 7 for accommodating the following repair device is formed between 6'. On the other hand, non-repair target pipe 1b
An end cap 8 is applied to the pipe opening.

The details of the pinch valves 6, 6' are shown in FIG. 13, and the valves 6, 6' consist of rubber valve sleeves 6a, 6a' provided flush with the inner peripheral surface of the pipe, and It is provided with annular chambers 6b, 6b' formed to surround the outer peripheries of the cylinders 6a, 6a', and when pressurized fluid such as compressed air is injected into the chambers 6b, 6b' through conduits 6c, 6c', the valve is activated. Tube 6
a, 6a' are constructed so as to bulge inward of the pipe and close the pipe line.

Furthermore, as shown in the left part of FIG. 3, at the working opening 3' on the terminal side, end caps 9, 10 will be applied.

After completing the terminal treatment of the pipe opening at the starting end of the pipe 1a to be repaired, the air bag 2 at this pipe opening is removed as shown in FIG. Ru. In the figure,
15 is a compressor.

Next, in order to repair the joint portion 4 of the pipe to be repaired 1a from the inside of the pipe, a repair device 16 is housed in the space 7 of the terminal pipe 5 as shown in FIG. During this storage operation, the outer pinch valve 6' is open.
Closed after storage.

This repair device 16 is installed in the pipe 1a to be repaired.
In order not to obstruct the flow of fluids such as gas or water, as shown in Figures 14 and 15, there is a
It has a through hole 16a that opens in the axial direction.
Furthermore, the repair device 16 is moved within the pipe by an operation outside the pipe, but such moving means itself is conventionally known, and for example, a self-propelled type or a rope-pulled type can be adopted. Self-propelled is shown. In the figure, 17 is a drive vehicle that pulls the repair device 16;
18 is a rope attached to the rear end of the repair device 16 in order to pull the repair device 16 back from inside the pipe;
The rear end of the rope 18 is pulled out of the tube through the center of the outer pinch valve 6' and wound around a winch 19 installed outside the tube, for example. When the pinch valve 6' is closed, the rope 18 is checked to the valve barrel 6a' of the valve 6', and the airtightness (watertightness) around the rope 18 is maintained.
is simply held by friction on the valve cylinder 6a, so it can move freely against the friction.

After the repair device 16 is accommodated in the space 7 of the end tube 5 and the outer pinch valve 6' is closed, as shown in FIG. 5, the inner pinch valve 6 is opened as shown in FIG. Then, the joint portion 4 is repaired by the repair device 16. The repair method using such a repair device 16 is known per se, and various known repair methods may be applied, but for example, the repair method shown in FIGS. 14 and 15 can be advantageously employed. This repair method is explained based on Figures 14 and 15.
With the cylindrical sealing member 20 whose diameter can be expanded appropriately at its lap portion 20a (see FIG. 14A) being supported on the sleeve 16b of the repair device 16, one of the pipes 1a to be repaired is It is carried up to two joint parts 4. Such position detection of the joint portion 4 is performed by a sensor (not shown) provided in the repair device 16 as usual. Next, as shown in FIG. 15, a compressor (not shown) installed outside the pipe passes the repair device 1 through the conduit 16c.
Compressed air is supplied into the air chamber 16d in the sleeve 16b, and as a result, the sleeve 16b receives compressed air pressure from the inner side through the opening 16e, expands, and seals the sealing member 20 on the outer peripheral surface of the sleeve 16b as shown in FIG. As shown in A, the lap portion 20a is expanded in diameter and brought into close contact with the inner circumferential surface of the joint portion 4 in a circumferential manner. At this time, an adhesive (not shown) is applied in advance to the outer circumferential surface of the sealing member 20, including the overlapping portion of the wrap portion 20a, and with this adhesive, the sealing member 20 is attached to the inner circumferential surface of the joint portion 4. It is fixed with adhesive and the repair is completed. After completing the repair, the supply of compressed air is stopped and the pressure on the inner surface of the sleeve 16b is released.
6b is reduced, allowing the repair device 16 to move freely within the tube again. The material of the sealing member 20 is not particularly limited, but a rubber plate, a thin metal plate such as aluminum (including alloys), or stainless steel, each singly or a laminate thereof, can be advantageously used.
Further, as the adhesive, it is advantageous to use, for example, an epoxy resin adhesive which is a reaction curing type and has a reaction curing time set according to the working conditions.

FIG. 7 schematically shows the state of repair of the joint 4 by the repair device 16. When the repair is completed, the repair device 16 is pulled back into the space 7 of the terminal pipe 5 by operating the rope 18, as shown in FIG. , then the inner pinch valve 6 is closed. Next, the outer pinch valve 6' is opened, the repair device 16 is taken out, and the sealing member is set thereon again. At this time, in the case of a gas pipe, opening the outer valve 6' without degassing is dangerous, so do not open the outer valve 6' after degassing from the gas vent pipe 21. preferable. In the figure, reference numeral 22 denotes a compressed air introduction pipe, which receives compressed air from the compressor 15. By repeating such operations, the joint portion 4 of the pipe 1a to be repaired can be successively repaired as shown in FIGS. 9 and 10.

After completing the repair of all the joint parts 4 of the repaired pipe 1a, as shown in FIG. 2, then the first
The entire repair work is completed by removing the terminal processing portion as shown in Figure 1, then repairing the work opening, removing the air bag 2, and repairing its insertion opening 14 as shown in Figure 12.

In the present invention, a gate valve 23 as shown in FIGS. 16 and 17, for example, can be used instead of the pinch valve 6 inside the terminal pipe 5. Other valves that can fully open and close the pipeline are:
It may have any structure. Also, instead of the outer pinch valve 6', a hatch 24 having a seal box 24a in the center, for example, can be used. As the seal box 24a, for example, as shown in FIG. 18, a pinch valve system including a valve cylinder 24a ₁ and an annular air chamber 24a ₂ surrounding the outer periphery of the valve cylinder 24a 1 can be adopted. Figure 19 shows the valve cylinder 2 of the seal box 24a.
4a ₁ is expanded inward by compressed air supplied into the air chamber 24a ₂ . FIG. 20 shows an example in which the repair device 16 is towed using a rope 25, and the rope 25 is
It is pulled out of the pipe through a valve box 26, which has the same structure as the valve box 24a, provided in the center of an end cap 9' that closes the mouth end of the pipe 1a to be repaired, and is wound up by a winch 27 installed outside the pipe. ing.

Effects of the Invention As described above, in the present invention, the repair of the joint part of the pipe to be repaired can be carried out while the pipe to be repaired is maintained in a state where gas or water is flowing. It has the advantage of being able to continue supplying gas or water to each household within the area, and allowing this type of repair work to be carried out without causing any inconvenience to households within the area.

[Brief explanation of drawings]

The drawings show a state of implementation of the construction method of the present invention, and FIGS. 1 and 2 are longitudinal cross-sectional views showing the state of forming a working opening,
Figures 3 and 4 are longitudinal cross-sectional views showing the state of terminal processing at the work opening, Figures 5 to 9 are vertical cross-sectional views showing the state of repair using a repair tool in the order of steps, and Figures 10 to 12 are A vertical cross-sectional view showing the steps from the completion of repair work to restoration of the existing pipe, Figure 13 is an enlarged view of the terminal pipe, Figures 14, 14A, 15 and 15A are repairs using a repair device. FIG. 16 is a vertical cross-sectional view showing another example of the terminal pipe, FIG. 17 is a plan view of FIG. 16, and FIG.
The figure is a longitudinal sectional view showing details of the seal box shown in Fig. 17, Fig. 19 is a perspective view showing the operating status of the seal box, and Fig. 20 is an example of construction when the repair device is towed by a rope. FIG. In the diagram, 1 is the existing pipe, 2 is the air bag, and 3 is the existing pipe.
is the working opening, 4 is the joint, 5 is the terminal pipe, 6 is the pinch valve, 7 is the space, 8, 9 and 10 are the end caps, 11 and 12 are the bypass pipes, 13 is the plug, 14 is the insertion port, 15 is the Compressor, 1
6 is a repair device, 17 is a driving vehicle, 18 is a rope, 19
is a winch, 20 is a sealing member, 21 is a gas vent pipe, 22 is an introduction pipe, 23 is a gate valve, 24 is a hatch, 25 is a rope, 26 is a valve box, 27
is a winch.

Claims (1)

[Claims] 1 In a repair method for repairing joints of existing pipes using a repair device that is sent into the pipe through a work port provided in the existing pipe under external operation, a work port is formed in the existing pipe. To do this, first, a bypass pipe is attached to the working opening forming part of the existing pipe, and while maintaining the flow state of the existing pipe, the inside of the pipe on both sides of the working opening forming part is closed off with a blocking member such as an air bag. After that, cut the space between these shielding members to create a work opening, and then install a pair of fully open and fully closed valves at the front and rear, separated from each other, at the mouth of the existing pipe to be repaired facing the work opening. A terminal pipe having a storage space for the repair device is connected between the equal valves, and the blocking member of the pipe opening is removed with at least one of the valves closed, and then the front valve is closed and the rear valve is opened. Then, with the rear valve closed and the front valve open, the repair device is sent into the existing pipe, and the through hole formed in the repair device maintains the flow of fluid in the pipe. A method for repairing an existing pipe joint, which is characterized by repairing the pipe joint.