JPH09112781A - Removal method for foreign matter in buried pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress supply quantity of water to the minimum and surely remove foreign matters in a buried pipe without any need of a large working space so as to be suited to a work for emergency such as occurrence of an earthquake. SOLUTION: Both sides of a main branch pipe 20, which is a buried pipe of a target to remove foreign matters, are made to open, an injection nozzle 42 of feed water equipment 40 is inserted from one end of the buried pipe, and the foreign matters in the pipe are made to discharge to the other end by the injection water from the injection nozzle 42. A suction hose 36 is connected to the end of the buried pipe, negative pressure is generated in the buried pipe via the suction hose 36, and the water and the foreign matters are sucked by this suction force so as to be removed to the outside of the pipe.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for eliminating foreign matter in a buried pipe, and more specifically, it eliminates foreign matter in an underground buried pipe such as a gas pipe or a water pipe damaged by an earthquake to promptly recover from a disaster. Related to a method that enables various recovery operations.

[0002]

2. Description of the Related Art A pipe configuration of a buried pipe will be described by taking a gas conduit for supplying city gas as an example. In FIG. ) A is buried at a depth of about 1 m, and from this main branch pipe A, for example, a supply pipe C having a diameter of 25 mm branches in a direction orthogonal to the main branch pipe A via a branch member B called a service Q. It is buried and draws gas supply into the private lands. In the private area, a supply pipe D is connected to the supply pipe C through a three-dimensional pipe portion E, and a meter inlet pipe F is connected to the supply pipe D, so that the main pipe A The gas is supplied to the gas pipe H on the consumer side through the gas meter G.

Conventionally, various methods have been known as a method for cleaning the inner surface of an existing pipe as described above to remove deposits such as rust formed on the inner surface of the pipe. As described in JP-A-3-035988, a high-pressure water jet nozzle connected to the tip of a high-pressure hose swirls the inner circumference of the pipe to wash the inner wall of the pipe, and Japanese Patent Publication No.
As described in Japanese Patent No. 050597, an annular swirl flow generator is installed on the upstream side of the abrasive mixture inlet to increase the flow velocity at the inner wall of the pipe to increase the momentum of the abrasive and enhance the grinding effect on the inner surface of the pipe. It has been known.

[0004]

On the other hand, when the buried pipe such as the main branch pipe A or the like as described above is impacted by a large earthquake, the water pipe to be buried along with the gas pipe is also provided. The pipes and other parts are damaged at the same time, and the spilled tap water enters the gas pipe together with a large amount of earth and sand, and the effluent water from the damaged part flows back into the damaged water pipe along with the earth and sand, blocking the water conduit. The situation occurs.

In such a case, it is important to first remove the foreign matter such as earth and sand from the buried pipe, but in order to eliminate the foreign matter in the buried pipe in an emergency such as the occurrence of this earthquake. If the conventional method for cleaning the inner surface of the pipe as described above is adopted, the following problems occur.

First, in the method of injecting high-pressure water described above,
It is necessary to supply a large amount of water to remove foreign matters such as sand and sand in the buried pipe by only spraying water, but in an emergency such as an earthquake, a large amount of water can be supplied due to damage to the water supply line. Since this is not possible, it is impossible to completely eliminate the foreign matter in the buried pipe by this method.

Further, in the above method of adding the abrasive,
It is impossible to remove foreign matters such as earth and sand in the buried pipe to the outside of the pipe unless the flow velocity of the polishing material is considerably increased, which results in enlargement of the equipment such as the annular swirl flow generator. However, after a large earthquake, it is expected that it will be difficult to secure a working space because many collapsed houses are covered on the road above the buried pipe where foreign objects are to be removed. The work method requiring work is unsuitable for work in an emergency such as when an earthquake occurs.

The present invention has been proposed in order to deal with such a situation, and minimizes the amount of water supply so as to be suitable for work in an emergency such as an earthquake. It is an object of the present invention to provide a method capable of reliably removing foreign matter in a buried pipe without requiring a large working space.

[0009]

In order to achieve the above object, the method for removing foreign matter in a buried pipe according to the present invention is a method for removing foreign matter in a buried pipe to the outside of the buried pipe. Both ends are opened, the injection nozzle of the water supply device is inserted from one end of the embedded pipe, and foreign matter in the pipe is caused to flow toward the other end by the water jetted from the injection nozzle, while being sucked to the other end of the embedded pipe. It is characterized in that a hose is connected, and water and foreign matter in the buried pipe are sucked through the suction hose and removed outside the pipe.

Further, the suction hose is connected to a suction device via a separating means for separating the sucked water and the foreign matter in the pipe, and the water separated by the separating means is returned to the water supply device for reuse. It is characterized by

Further, the water supply device is characterized in that it is a water jet ejection device for ejecting a water jet from an injection nozzle.

[0012]

According to the above method of eliminating foreign matter in the buried pipe, the foreign matter in the buried pipe is simultaneously discharged to the other end side by the force of the jet water of the jet nozzle of the water supply device inserted from one end of the buried pipe. , Is sucked out of the buried pipe by the suction force applied by the suction hose connected to the other end. Therefore, the amount of water supply required to completely remove the foreign matter in the buried pipe can be made much smaller than the case where the foreign matter is eliminated only by the outflow action of water.

Then, the water sucked through the suction hose and the foreign matter in the pipe are separated by the separating means, and the separated water is returned to the water supply device for reuse, thereby further saving the required water supply amount. It will be possible.

Further, for the buried pipe from which foreign matter is to be removed,
Since the work can be performed simply by inserting the injection nozzle of the water supply device at one end and connecting the suction hose to the other end, the space of the work holes formed at both ends of the embedded pipe to be excluded from foreign matter is Only a small space is required to insert or connect a suction hose. Therefore, even when it is difficult to secure a working space because a large number of collapsed houses and the like are covered on the road above the buried pipe from which foreign matter is to be removed, work can be performed.

Furthermore, by using the water jet ejecting device as the water supply device, the foreign matter in the pipe can be swiftly discharged and the work becomes efficient.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory diagram showing a method for removing foreign matter in a buried pipe according to an embodiment of the present invention. The present embodiment shows a method of removing foreign matter when the gas pipeline is damaged by an earthquake and foreign matter such as earth and sand is mixed in the gas pipeline.

The removal of foreign matter in the buried pipe must be carried out as the first work for promptly restoring the damaged gas conduit after a large earthquake. First, the foreign matter enters the main branch pipe 20 as the buried pipe. A work target section for removing the earth and sand 21 as a foreign matter is defined, and the vacuum excavating vehicle 3 is provided at both ends thereof.
0 is used to form the working holes 12 and 13,
The main branch pipe 20 buried in 13 is exposed. And
The main branch pipe 20 is cut in the working holes 12 and 13 to open both ends thereof.

Then, the suction port 37 of the suction hose 36 of the vacuum excavator 30 is connected to one open end of the foreign substance exclusion pipe formed by cutting the main branch pipe 20 in the working hole 12. Further, at the other end of the foreign substance exclusion target pipe, a water supply device 40 is arranged near the formed working hole 13, and the main branch pipe 20 is cut in the working hole 13 to open the foreign substance elimination target book from the open end. The injection nozzle 42 at the tip of the water supply hose 41 is inserted into the branch pipe 20. The injection nozzle 42 has a form in which the inside of the main branch pipe 20 is thereby closed and the inside of the pipe is sealed, and water is jetted from the tip thereof.

The vacuum excavation vehicle 30 has a form in which a truck is connected to a truck bed, and an engine 31 as a power source for work and a vacuum blower 32 driven by the engine 31 are mounted on the front portion of the truck bed. In addition, an air filter 33 is mounted on the rear part of the loading platform and a vacuum blower 32 is installed.
It is connected to the. Further, a water separation tank 35 is mounted on a truck connected to the rear of the loading platform, and a suction hose 36 having one end connected to one open end of the main branch pipe 20 from which foreign matter is to be removed is connected to the water separation tank 32. The ends are connected, and the water separation tank 35 is further connected to the air filter 33 via a suction hose 34.

The suction hose 36 is used as the main branch pipe 2 for removing foreign matter.
0 is connected to the open one end and the other end is inserted with the injection nozzle 42 of the water supply device 40 to complete the foreign matter elimination work, and then the engine 31 of the vacuum excavator 30 is started, whereby the vacuum blower is started. Activate 32. The vacuum suction force generated by the vacuum blower 32 is sealed by inserting the injection nozzle 42 from the other end through the air filter 33, the suction hose 34, the water separation tank 35, the suction hose 36, and the suction port 37. The foreign matter is transmitted to the main branch pipe 20 to be excluded. Suction port 37 in the main branch 20
When the side becomes negative pressure, the earth and sand 2 accumulated in the main branch pipe 20
1 is sucked toward the negative pressure side, and at the same time, when the water supply device 40 is operated and water is jetted from the jet nozzle 42, the earth and sand 21 in the main branch 20 flows with the jetted water and the suction port. It flows out to the 37 side. Further, when suction and jetting of water are continued, the earth and sand 21 flowing out together with the water are all sucked by the suction port 3 by the vacuum suction force of the vacuum blower 32.
7 is sucked into 7, and is discharged outside the tube through the suction hose 36. At this time, if necessary, the injection nozzle 42 inserted into the pipe is gradually moved toward the suction port 37 to proceed with the operation, thereby enabling a more rapid operation.

The water and earth and sand sucked from the suction port 37 toward the vacuum excavator 30 are separated into water and earth and sand in the water separation tank 35, and the earth and sand are separated in the water separation tank 35 or the air filter 3.
3, and air is expelled out of the vacuum blower 32.

Next, another embodiment will be described with reference to FIG. The same parts as those in the embodiment of FIG. 1 are designated by the same reference numerals and the description thereof will be omitted. In this embodiment, the suction hose 36
After separating the earth and sand sucked via the water into the water and earth and sand in the water separation tank 35, the separated water is returned to the water supply device 40 for reuse. Here, the water separation tank 35 and the water supply device 40 are connected by a return hose 43. Then, the water separated in the water separation tank 35 is sent to the water supply device 40 by the pump 44 provided in the middle portion of the return hose 43, and is re-injected from the injection nozzle 42 at the tip of the water supply hose 41 to reuse the water. , Main branch 2
It is intended to save the amount of water required to completely remove foreign matter from within 0.

As another embodiment, by using the water supply device 40 in the above-mentioned embodiment as a water jet injection device and inserting a water jet injection nozzle into the main branch pipe 20, the outflow of earth and sand can be further speeded up. It becomes possible to proceed to.

[0024]

Since the present invention is configured as described above,
The following effects are obtained. (1) Open both ends of the buried pipe from which foreign matter is to be removed, insert the jet nozzle of the water supply device from one end of the buried pipe, and let the foreign matter in the pipe flow toward the other end by jetting water from the jet nozzle. However, since a suction hose is connected to the other end of the buried pipe and water and foreign matter in the buried pipe are sucked through the suction hose to be removed outside the pipe, the foreign matter in the buried pipe is At the same time as the water ejected from the water injection device inserted from one end flows out to the other end side by the force of the water, the suction hose connected to the other end side sucks and removes it outside the buried pipe. To be done. Therefore, the amount of water supply required to completely remove the foreign matter in the buried pipe can be made much smaller than the case where the foreign matter is eliminated only by the outflow action of water. (2) Further, for the buried pipe to be excluded from foreign matters, the operation can be performed only by inserting the injection nozzle of the water supply device at one end and connecting the suction hose to the other end. The space of the working holes formed at both ends of the buried pipe is only a small space where the injection nozzle can be inserted or the suction hose can be connected.There are many collapsed houses on the road above the buried pipe where foreign objects are to be removed. It is possible to work even when it is difficult to secure a working space because it is covered. (3) Further, the suction hose is connected to the suction device via a separating means for separating the sucked water and the foreign matter in the pipe, and the water separated by this separating means is returned to the water supply device for reuse. Since this is done, it is possible to further reduce the amount of water supply required to eliminate foreign matter in the pipe. (4) Further, by using the water jet ejecting device as the water supply device, the foreign matter in the pipe can be swiftly discharged and the work can be performed efficiently.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing an embodiment of the present invention.

FIG. 2 is an explanatory view showing another embodiment of the present invention.

FIG. 3 is an explanatory diagram showing a piping form of an existing gas conduit.

[Explanation of symbols]

 12, 13 Working hole 20 Main pipe 21 Sediment 30 Vacuum excavator 31 Engine 32 Vacuum blower 33 Air filter 34, 36 Suction hose 35 Water separation tank 37 Suction port 40 Water supply device 41 Water supply hose 42 Injection nozzle

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hideaki Hayashida 15-10 Miyamatsu-cho, Hiratsuka-shi, Kanagawa Tokyo Gas Hiratsuka Apartment No. 521 (72) Inventor, Kazuyasu Takeuchi, Daiwa City, Kanagawa Prefecture 3-18-3 Stock Company Inside the Hakko Technology Development Center

Claims (3)

[Claims] 1. A method for removing foreign matter inside a buried pipe to the outside of the pipe, wherein both ends of the buried pipe subject to foreign matter removal are opened, and an injection nozzle of a water supply device is inserted from one end of the buried pipe, While injecting foreign matter in the pipe toward the other end by the water jetted from the injection nozzle, a suction hose is connected to the other end of the buried pipe, and the water and foreign matter in the buried pipe are sucked through the suction hose A method for removing foreign matter in a buried pipe, which is characterized in that it is removed to the outside. 2. The suction hose is connected to a suction device via a separating means for separating the sucked water and the foreign matter in the pipe, and the water separated by the separating means is returned to the water supply device for reuse. The method according to claim 1, wherein the foreign matter in the buried pipe is removed. 3. The method according to claim 1, wherein the water supply device is a water jet ejection device that ejects a water jet from an injection nozzle.