JPH0242160B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is applicable to pipes mainly buried underground, such as sewer pipes, industrial water pipes, agricultural water pipes, and gas pipes. Sealing joints between pipes, joints between main pipes and branch pipes, or cracks that occur in pipes, etc., are sealed by injecting and solidifying chemical solutions to avoid inconveniences such as groundwater flowing into pipes. This invention relates to a leak repair device and a leak repair method using the device.

[Conventional technology]

As shown in Figure 4 of the drawings, this type of leakage repair equipment and leakage repair method has conventionally been carried out in a state in which both the upper and lower sides of the leakage point in the pipe line 1' are closed and sealed with sealers 2, 2. In this case, a method has been adopted in which water is stopped by simply injecting the chemical liquid into the leakage area from the chemical liquid discharge port 3' arranged in the sealed space.

[Problem to be solved by the invention]

Chemical solutions used for repairing leaks in pipelines require high gel strength and long-term stability from the viewpoint of sealing reliability, such as water-tightness, which is the originally required performance. In addition, especially when used for underground pipelines, in order to form a water stop layer on the earth and sand around the leakage point of the pipeline by injecting chemical solution, It is desirable to select and use a chemical solution that matches the soil quality around the pipe, and if there is moving water (flow of groundwater) around the pipe, it is desirable to use a chemical solution that is difficult to dilute and wash away.

However, according to the above-mentioned conventional means, when injecting the chemical liquid sequentially according to the leakage location, in order to prevent the discharge port 3' from becoming clogged with the gelled substance of the chemical liquid, the chemical liquid is There is a constraint that a water glass-based water-soluble grout with low gel strength must be used so that the gelled material can be broken down and injected by the injection pressure.For this reason, the following ~
There was a problem that this resulted in the disadvantages of

Sufficient gel strength, which is the originally required performance of chemical solutions, cannot be expected, and the gelled products of water glass-based water-soluble grouts tend to leached out (gelled products diffuse into solvents such as ground water) after many years. ), its strength decreases as its volume decreases (shrinkage), and it becomes more likely to leak again.

Moreover, since the strength of the homogel is low, when it is used in pipes buried in clayey soil, as is well known, the chemical solution concentrates in the cracked parts of the clayey soil caused by the injection pressure of the chemical solution. This results in the inconvenience that a reliable water stop layer cannot be formed outside the leakage area.

In addition, since water glass-based water-soluble grout is a type of chemical solution that gels by mixing two components, the mixing becomes uneven and the gelation reaction becomes uncertain, making it difficult to have a reliable water-stopping function. It may not be effective.

In addition, in the case of the above-mentioned moving water, it is easy to dilute and flow out, further increasing the uncertainty of the gelation reaction. There was no choice but to do so, and the economic loss in terms of materials was considerable.

In addition, in terms of construction, the gel time is long and unstable due to the dilution and flow of the chemical solution by the moving water, and it takes a long time to inject the chemical solution. It is also possible to use a chemical solution based on the chemical composition, but in that case, the permeability of the chemical solution becomes poor, resulting in the disadvantage that a water-blocking layer of sufficient thickness cannot be formed.

In view of such circumstances, the first invention uses a type of chemical solution that is compatible with the soil quality in the same area, depending on various conditions around the outside of the pipe, such as soil quality, while ensuring that the chemical solution outlet is not clogged. It is an object of the present invention to provide a conduit leakage repair device that can avoid such problems and is versatile in terms of adaptability to the chemical solutions used.

It is an object of the present invention to reliably prevent clogging of the chemical solution outlet in the leak repair device when a chemical solution with high gel strength is used, and to prevent clogging of the chemical solution outlet in multiple locations while fully utilizing the characteristics of the leak repair device. The purpose of this invention is to enable efficient leakage repair.

[Means to solve the problem]

In order to achieve the above object, in the first invention,
There are two packers, front and rear, which can be operated to expand and contract, can close to the inner surface of the pipe in the expanded state to shut off the pipe, and are movable within the pipe in the contracted state, and between the two packers, A discharge port is provided for a chemical solution for leak repair and a cleaning agent for treating a reaction solidified product of the residual chemical solution, and the discharge port is equipped with a switching valve that can select and feed the chemical solution and the cleaning agent in a contradictory manner. A supply pipe is provided, and a means for moving the packer along the axial direction within the pipe is provided.

The second invention also includes two packers, front and rear, which can be operated to inflate and deflate, can close to the inner surface of the conduit to shut off the conduit in the inflated state, and are movable within the conduit in the deflated state. A discharge port for a leakage repair chemical solution and a cleaning agent for treating a reaction solidified product of the residual chemical solution is provided between the two packers, and the chemical solution and the cleaning agent are selectively used at the discharge port. A leak repair method using a leak repair device, which is equipped with a supply pipe equipped with a switching valve capable of supplying water, and a means for moving the packer along the axial direction of the pipe. After stopping the packer so that the discharge port coincides with the leakage point, both packers are inflated to shut off the pipe section before and after the leakage point, and in this state, the supply pipe and the switching valve are closed. , the chemical solution is discharged into the cut-off space through the discharge port to seal the leakage point by a hydration reaction, and then the switching valve is switched to supply the cleaning agent to the cut-off space via the supply pipe, the switch valve, and the discharge port. A technical measure is taken in which the reaction solidified product of the residual chemical solution is treated by discharging it into the tank, and then the packer is contracted and moved.

[Function] As a result of taking the above-mentioned technical means, in the first invention, immediately after the repair of the leakage point is completed by discharging the chemical liquid from the chemical liquid discharge port, by switching the switching valve to supply the cleaning agent, By cleaning the ejection port, clogging of the ejection port due to gelation of the chemical solution can be avoided.

Therefore, repair work can be carried out using any chemical solution for leak repair, such as a substance with a quick solidification reaction or a substance with high gel strength.

In addition, in the second invention, in addition to having a high degree of freedom in selecting the chemical liquid to be used, after the chemical liquid is discharged to seal the leakage location, the cleaning agent is discharged into the cutoff space to react with the remaining chemical liquid. After treating the solidified material, the leak repair equipment is moved to the next location, so while the leak repair equipment is moving within the pipe, unreacted chemical solution may react with moisture in the pipe and cause the discharge port to become clogged. Blockages can be reliably avoided, and repair work can be quickly resumed at the next location.

〔Effect of the invention〕

(b) Due to the above-mentioned effects, in the first invention, it has become possible to use a chemical solution with a high gel strength such as a hydrophobic urethane grout with a high water-stopping effect, which could not be used in the past. We have now achieved a highly versatile leak repair device that can select and use the optimal chemical solution depending on the various conditions surrounding the pipe, such as soil quality and water movement.

(b) Due to the above-mentioned effects, the second invention can perform high-strength water stoppage using a chemical solution that is appropriate for the soil conditions around the pipe, and can also carry out continuous work (all at once) to repair leaks at multiple locations. It has become possible to perform the process well and efficiently.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

As shown in FIG. 1, two round-shaped hollow bodies 2a which can be elastically expanded and contracted using a rubber-like substance or the like are integrally connected via a cylindrical member 2b, and disks 10 are attached to each end of the hollow bodies 2a. A device 11 for supplying a fluid such as air under pressure is connected to each of the hollow bodies 2a through a supply pipe 7a such as a hose, and a chemical solution such as hydrophobic urethane grout is applied while adjusting the pressure. A supply pipe 5 connected to a pressure gauge-equipped injection device 12 for injection is provided so that its discharge port 3 is located on the outer peripheral surface of the central cylindrical member 2b, and the hydrophobic urethane grout is further cleaned. A device 13 for supplying a cleaning agent made of xylene or a plastic material such as DOP or DPP is connected to the chemical solution supply pipe 5 via a switching valve 4 through a supply pipe 6 such as a hose, and the switching valve 4 is switched. Accordingly, the chemical liquid and the cleaning agent are selectively sent to the discharge port 3, and a member 15 for connecting a traction tool 14 such as a wire is attached to both the front and rear disks 10, 10. Then, a flexible connector 16 such as a wire is installed across each disk 10 to prevent the hollow body 2a from stretching due to traction,
This constitutes a leak repair device A that can easily pass through a pipe with a single bend and supplies a chemical solution for repairing leaks to pipe joints and the like.

Note that 8 in the drawing is a check valve that prevents backflow of the chemical solution.

Next, a procedure for repairing a leakage point in the pipe line 1 using the leakage repair apparatus A will be explained with reference to FIG. 2.

As shown in Fig. 2A, a television camera 9 is inserted into the sewer pipe 1 consisting of a fume pipe 1a through manholes M and M, and as it moves inside the pipe 1, it checks and memorizes leakage points. I'll keep it.

Next, as shown in FIG. 2B, the television camera 9
At the same time, the leakage repair device A is introduced into the pipe line 1,
It is moved by the traction tool 14 to the leakage point checked in the previous step, and set so that the center of the central cylindrical member 2b and the leakage point are aligned.

Next, as shown in FIG. 2C, the hollow bodies 2 at both ends are
It is used as a packer 2, 2 that shuts off the pipe line 1 in a sealed state by inflating the packers 2, 2a. Inject into the leakage point from outlet 3.

Finally, as shown in FIG. With the cleaning agent S being discharged and filling the airtight space between the two police cars 2 and 2, the leakage repair device was moved back a little, and the water stoppage status was checked using a TV camera. If so, move the leak repair equipment to the next leak location.

Next, another embodiment of the present invention will be described.

(a) Instead of the hollow packers 2, 2 that elastically expand and contract when the gas is fed,
As shown in FIG.
The ends of the member 17,
A single-acting hydraulic cylinder 18 and a tension spring 19 are bridged between the members 17 and 17, and an annular fluid bag 20 filled with fluid is provided around the outer periphery of both members 17 and 17, and a rubber bag 21 is provided around the outer periphery of the annular fluid bag 20. The packer 2 is configured such that the bag 21 is covered with a pipe 7b for feeding or extracting fluid from the fluid pressure cylinder 18, and the bag 21 is expanded or contracted by the expansion and contraction of the fluid pressure cylinder 18 by the fluid supplied through the pipe 7b. do.

(b) The leak repair equipment is moved by sending high-pressure air into the pipeline 1.

(c) Instead of the television camera 9, use an electromagnetic detection device or a photo detection device.

(d) The time when the discharge port 3 is filled with cleaning agent is determined by the time when the discharge port 3 is advanced beyond the water stop point after the water stop state has been inspected using a TV camera as shown in Fig. 2 (e). Let's do it.

Furthermore, the leakage repair device of the present invention can be used not only for sewers, but also for underground pipelines such as industrial waterways, agricultural waterways, gas pipelines, etc., as well as pipelines exposed above ground. be.

Incidentally, although reference numerals are written in the claims section for convenient comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.

[Brief explanation of drawings]

The drawings show an embodiment of the pipe leakage repair device and leakage repair method according to the present invention, and FIG. 1 is a sectional view of the main part, FIGS. Figures 3A and 3B are cross-sectional views showing another embodiment;
The figure is a sectional view showing a conventional example. 1...Pipe line, 2...Pass car, 3...Discharge port,
4...Switching valve, 5, 6...Supply pipe, 8...Check valve, 9...TV camera.

Claims (1)

[Scope of Claims] 1. Two front and rear packs that can be operated to expand and contract, can close to the inner surface of the pipe line 1 in the expanded state to shut off the pipe line 1, and are movable within the pipe line 1 in the contracted state. 2, 2, and a discharge port 3 is provided between the two packers 2, 2 for a chemical solution for leak repair and a cleaning agent for treating a reaction solidified product of the residual chemical solution. A switching valve 4 capable of selectively feeding the cleaning agent in a manner contrary to the cleaning agent.
A leakage repair device for a pipe line, characterized in that it is provided with supply pipes 5 and 6 with attached pipes, and means for moving the packers 2 and 2 along the axial direction within the pipe line 1. . 2. The leak repair device according to claim 1, wherein the packers 2, 2 are constituted by a cylindrical hollow body 2a that can be elastically expanded and contracted by feeding and extracting fluid. 3. The leak repair device according to claim 1, wherein the pipeline 1 to be repaired for leakage is a water pipeline. 4. Two packers 2, 2, front and rear, which can be operated to inflate and deflate, can close to the inner surface of the conduit 1 to shut off the conduit 1 in the inflated state, and can move within the conduit 1 in the deflated state are provided. A discharge port 3 for a leakage repair chemical solution and a cleaning agent for treating a reaction solidified product of a residual chemical solution is provided between the two packers 2, 2, and the discharge port 3 is provided with a discharge port 3 for discharging the chemical solution and the cleaning agent against each other. Switching valve 4 that can selectively feed
A leak repair method using a leak repair device equipped with supply pipes 5 and 6 with attached pipes and means for moving the packers 2 and 2 along the axial direction within the pipe line 1. After stopping the movement of the packers 2, 2 so that the discharge port 3 coincides with the leakage point, both packers 2, 2 are expanded to cut off the portion of the pipe line 1 before and after the leakage point, In this state, the chemical solution is discharged into the cutoff space through the supply pipe 5, the switching valve 4, and the discharge port 3, and the leakage point is sealed by a water reaction.Then, the switching valve 4 is switched, and the supply pipe 6 is switched. Leakage of a pipeline characterized in that cleaning agent is discharged into the cutoff space through the valve 4 and discharge port 3 to treat the reaction solidified product of the residual chemical solution, and then the packers 2 are contracted and moved. Repair method.