JPH09174008A - Removal of foreign matter from buried pipe and device therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable the removal of foreign matters present in a pipe even from a buried pipe with only one end exposed by providing a first open part on the exposed end of the buried pipe and a second open part on the part stretched to the ground surface of a diverged pipe from the buried pipe. SOLUTION: A service hole 12 is excavated using a vacuum excavation truck 30, and a main or a branch pipe 20 is cut inside the hole 12. After that, a suction port 37 on the vacuum excavation truck 30 is connected to the exposed end (a first open part) formed by cutting the main or the branch pipe 20. Next, the main or the branch pipe 20 is closed in a valve manipulating hole 14 by manipulating a valve 22 located at an area where the service hole 12 is desired to be opened or near the area with a bar inserted into the valve manipulating hole 14. Further, a gas meter is removed from a connecting aperture to the gas meter mounted on a meter inlet pipe 23 as a diverged pipe stretched to the ground surface between the valve 22 and the suction port 37. Consequently, a second open part is provided on the end part where the meter inlet pipe 23 is removed. A negative pressure is generated on the internal suction port 37 side of the main or the branch pipe 20 by starting a vacuum suction process, and a residing earth and sand 21 are sucked to the negative pressure side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for eliminating foreign matter in a buried pipe, and more particularly, to eliminate foreign matter in an underground buried pipe such as a gas pipe or a water pipe damaged by an earthquake or the like to prevent a disaster. And method for enabling quick recovery work of

[0002]

2. Description of the Related Art An example of a gas conduit for supplying city gas will be described with reference to FIG. A supply pipe C having a diameter of 25 mm, for example, horizontally extends from the main branch pipe A through a supply pipe outlet B into the civilian area. The inner pipe D is connected to the supply pipe C through the three-dimensional pipe portion E in the private area, and the meter inlet pipe F is connected to the inner pipe D, so that the main branch pipe A The gas from is supplied to the gas pipe H on the consumer side via the gas meter G.

Conventionally, for cleaning the inside of the main branch pipe A and the like, a high-pressure water jet nozzle connected to the tip of a high-pressure hose swivels the pipe circumference as described in JP-B-3-035988. For cleaning the machine, Japanese Patent Fair 3-0
As described in Japanese Patent No. 50597, there is known one in which an annular swirl flow generator is installed on the upstream side of the abrasive material mixing port to increase the flow velocity on the inner wall side of the pipe to increase the momentum of the abrasive material to enhance the grinding effect. Has been.

[0004]

However, since such a conventional method for cleaning the inside of the pipe is premised on the work in normal times, the end of the pipe to be cleaned is attached to the cleaning device. It is assumed that it is in a state where it can be used freely. At least, a certain amount of drainage flow from the open end for cleaning to the inside of the pipe or the other end must be secured.

Therefore, in a situation where a gas pipe or a water pipe in the ground is damaged due to occurrence of a large earthquake and a large amount of foreign matter such as earth and sand is clogged in these buried pipes, the conventional cleaning method is used. Etc. cannot deal with it. For example, if the tap water that has flowed out remains in the gas conduit together with a large amount of earth and sand, or if the water that has flowed out of the damaged part is clogged with earth and sand in the damaged water conduit, the above-mentioned method is used. It is impossible to deal with such problems.

In such a case, it is important to first remove these foreign matters such as earth and sand, but in an emergency, in order to eliminate the foreign matter in the pipe, excavation is performed around the buried pipe to be excluded. In many cases, it is not possible to even dig out the target buried pipe.

That is, if it is possible to excavate freely according to the construction plan as in normal times, excavate work holes of a width and depth that allow vacuum suction and soil removal at predetermined intervals to expose the buried pipe. It is also conceivable to remove foreign matter in the buried pipe by releasing one of the buried pipes at each interval and suctioning dirt and sand from the other end, but after a large earthquake, etc. A large number of collapsed houses etc. are covered on the road above the buried pipe to be excluded, and the place where the work hole can be excavated is limited.Therefore, other work is done within a predetermined interval from a certain work hole. Sometimes it is not possible to drill a hole.

[0008] Therefore, as one of the recovery works from a disaster such as an earthquake, even for a buried pipe which can be exposed only at one end, a method for eliminating foreign matter inside the buried pipe is established and the method is efficiently performed. The issue is to install and equip the above equipment. In addition, since the traffic conditions have deteriorated in the event of an earthquake, it is desirable that there be few equipment for restoration work brought to the site. Furthermore, when drinking water tends to be insufficient, it is not preferable to waste a large amount of clean water or purified water for work.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a method for eliminating foreign matter in a pipe of a buried pipe whose one end is exposed. Another object of the present invention is to realize a soil excavating device capable of efficiently removing foreign matter in a pipe in a buried pipe whose one end is exposed.

[0010]

The constitution, operation and effect of the first to fifth means for solving the problems, which have been invented to solve the above problems, will be described below.

[First Solving Means] A method for removing foreign matter in a buried pipe according to the first solving means (as described in claim 1 at the beginning of the application) includes a first opening and a second opening. A method for removing foreign matter in a buried pipe, wherein the first opening of the buried pipe is vacuum-sucked to remove foreign matter in the buried pipe from the first opening to the second opening. 1 opening is provided at the exposed end of the buried pipe, and the second opening is
The method is characterized in that it is provided in a portion of the branch pipe of the buried pipe extending above the ground.

Here, the "exposed end of the buried pipe" is often formed by excavating around the middle of the buried pipe to expose the buried pipe in that portion and then cutting the buried pipe there. When there is an existing exposed portion on a cliff or the like, the end of this exposed portion may be the same as it is or the exposed end formed on this exposed portion may be used.

In the method for removing foreign matter in the buried pipe according to the first solving means as described above, when vacuum suction is performed from the exposed end of the buried pipe, the inside of the buried pipe becomes a negative pressure and is passed through the branch pipe. The outside air then flows into the buried pipe. Then, the inflowing air carries the foreign matter in the pipe to the exposed end side of the buried pipe, is vacuum-sucked and is discharged.

As a result, the opening provided in the branch pipe on the ground acts as a substitute for the other exposed end for the inflow of outside air, so that damage to the ground above the buried pipe such as a condominium or a highway destroyed by an earthquake or the like can be prevented. Even if only one exposed end of the buried pipe is available due to the restriction of the excavation around the buried pipe due to the existence, vacuum suction can be performed.

Therefore, according to the present invention, the foreign matter in the pipe can be eliminated by vacuum suction even for the buried pipe exposed only at one end.

[Second Solving Means] The method for eliminating foreign matter in a buried pipe according to the second solving means is the above-mentioned first method for eliminating foreign matter in a buried pipe, which is a first branch from the buried pipe to the ground. The pipe is provided with the second opening to remove foreign matter in the pipe by vacuum suction of the first opening, and then the first branch pipe is closed, and the buried pipe from the exposed end to the branch point. A second distance along which is larger than the first branch pipe
A branch pipe is selected, the second opening is provided in a portion of the second branch pipe extending to the ground, and foreign matter in the pipe is removed by vacuum suction of the first opening. Is.

In the method for removing foreign matter in the buried pipe according to the second solving means, first, foreign matter in the buried pipe between the first branch pipe and the exposed end is removed by vacuum suction. This is done so that there is no foreign material in the meantime. Then, foreign matter in the buried pipe between the second branch pipe and the exposed end is removed by vacuum suction, but the foreign substance has already disappeared between the first branch pipe and the exposed end. Therefore, the foreign matter in the buried pipe between the second branch pipe and the first branch pipe exposed end is substantially removed by vacuum suction.

As a result, the foreign matter can be divided and discharged little by little. Therefore, since the branch pipe has a small diameter and the inflow amount of outside air is small, the foreign matter discharge capacity is weak and the foreign matter cannot be discharged all at once. Even in this case, vacuum suction can be performed.

Therefore, according to the present invention, it is possible to eliminate the foreign matter in the pipe by vacuum suction even for the buried pipe whose one end is exposed.

[Third Solving Means] A method for removing foreign matter in a buried pipe of a third solving means (as described in claim 2 at the beginning of application) is as follows. A method of removing foreign matter, characterized in that water is caused to flow in through the second opening.

In the method for removing foreign matter in the buried pipe of the third solving means, when vacuum suction is performed from the exposed end of the buried pipe, the inside of the buried pipe becomes a negative pressure, and the pressure rises through the branch pipe. Water from the outside flows into the buried pipe. Then, the inflow water carries foreign matter in the pipe to the exposed end side of the buried pipe,
Vacuumed and discharged.

When water is introduced from the side opposite to the suction side to fill the gaps such as sand with water, the negative pressure suction force increases, so that the ability to discharge foreign matters such as sand increases. In addition, when a lump of soil or the like dissolves in water to form a muddy state, it becomes atmospheric flowing water and is sucked at high speed, so that the capability of discharging foreign matter such as soil is enhanced.
Further, the running water also rinses away dirt and the like adhering to the wall of the buried pipe. Therefore, the efficiency of discharging the foreign matter is improved.

Therefore, according to the present invention, the foreign matter in the pipe can be efficiently removed by vacuum suction even for the buried pipe whose one end is exposed.

[Fourth Solving Means] An apparatus for removing foreign matter in a buried pipe according to the fourth solving means (as described in claim 3 at the beginning of the application) has a first opening and a second opening. An apparatus for removing foreign matter in a buried pipe, comprising: a suction means for vacuum-sucking the first opening of the buried pipe and a water separation means for separating water from the suctioned material by the suction means. It is characterized by comprising a water feeding means for feeding the water separated by the above to the second opening.

Here, the above-mentioned "feeding toward the opening" means not only sending the sent water directly into the opening but also the water flowing from the opening. It also means that the water is supplied to a water storage means such as a bucket or a tank installed near the opening for storing.

In the device for removing foreign matter in the buried pipe according to the fourth solving means, the foreign matter in the buried pipe from the first opening to the second opening is removed by the suction means. At the same time, the water is recovered from the foreign matter by the water separating means, and the water is further sent to the second opening by the water sending means. Therefore, by injecting the collected and fed water from the second opening, the efficiency of foreign matter removal can be improved.

As described above, since the water separated from the suctioned substance is refluxed as the inflowing water, the same water can be repeatedly used to remove the foreign matter, whereby the water accumulated as the foreign matter in the buried pipe can be used. Foreign substances can be removed efficiently without using a large amount of clean water or purified water by simply injecting a predetermined amount of water or adding a small amount of insufficient water at first. .

Therefore, according to the present invention, it is possible to efficiently remove foreign matter in the pipe by vacuum suction of the buried pipe exposed at one end without wasting clean water and purified water.

[Fifth Solving Means] The foreign matter removing device for the foreign matter in the buried pipe of the fifth solving means is the foreign matter removing device for the foreign matter in the buried pipe of the fourth solving means, wherein the suction means is a vacuum of soil. It is a vacuum suction means of the drilling device, the water separation means,
A water separation tank inserted in a suction path of the vacuum excavator, wherein the water supply means pumps water by introducing exhaust gas or exhalation gas from the vacuum suction means of the vacuum excavator into the water separation tank. It is characterized by being

In the device for removing foreign matter in the buried pipe according to the fifth solving means, since the suction means is the vacuum suction means of the soil vacuum excavator, a part of the buried pipe is cut. Immediately after excavating the surroundings of the buried pipe with the vacuum excavation device to form the exposed end for discharging the foreign matter, the foreign substance in the buried pipe can be immediately removed by the same device.

Moreover, the separation and recirculation of the water used for this foreign matter elimination work are also performed by utilizing the exhaust or the exhalation of the same device. As a result, the vacuum suction force generation source of the vacuum excavation device is also used as the water supply pressure generation source, so that the water supply pump can be used even when it is difficult to carry in many devices and equipment due to bad traffic conditions. The foreign material in the buried pipe can be efficiently removed only by the vacuum excavation device without preparing the above.

Therefore, according to the present invention, even under difficult conditions such as transportation, it is possible to quickly and efficiently eliminate foreign matter in the pipe by vacuum suctioning the buried pipe exposed at one end without wasting clean water and purified water. It can be carried out.

[0033]

BEST MODE FOR CARRYING OUT THE INVENTION A first embodiment, which is considered to be the best method for eliminating foreign matter in a buried pipe according to the present invention, will be described with reference to the drawings. FIG. 1 is a diagram showing how this method is applied to a gas conduit.

In order to promptly restore the gas conduit after a large earthquake, the earth and sand 21 as foreign matter remaining in the main branch pipe 20 as a buried pipe is discharged to the outside of the pipe. At this time, if many collapsed houses 11 remain on the ground above the main branch 20, they will be an obstacle,
Although it is possible to form the exposed end for the first opening by drilling the working hole 12 and cutting the main branch pipe 20 exposed there, there is another pair for the second opening which is paired with this. A situation arises in which the working hole 13 required to form the exposed end cannot be drilled.

Therefore, under such a circumstance, the work hole 12 is digged for the time being by using the vacuum digging vehicle 30. Then, the main branch pipe 20 is cut in the working hole 12. Then, the suction port 37 of the vacuum excavator 30 is connected to the exposed end of the main branch pipe 20 formed by cutting. This completes the preparation on the exposed end side for performing vacuum suction by the vacuum excavating vehicle 30.

Next, the valve 22 at or near the point where the working hole 13 is desired to be opened is operated by a rod or the like inserted from the valve operating hole 14 to close the main branch pipe 20 at this point.
As a result, it is possible to prevent excess sand and the like from flowing in from the damaged portion and the like ahead of this.

Then, the meter inlet pipe 23 as a branch pipe extending to the ground between the valve 22 and the suction port 37 is subjected to a process of disconnecting the connection port to the gas meter from the meter. As a result, the second opening is provided at the removed end of the meter entry pipe 23.

Further, by putting water into the water bucket 24 and carrying it, and utilizing the fact that the end of the meter-in pipe 23 is generally bent downward, the end of the meter-in pipe 23 is immersed in the water in the water bucket 24. Set the water bucket 24 so that it is inside. As a result, the preparation for inflowing water from the meter inlet pipe 23 is also prepared.

When the engine 31 of the vacuum excavating vehicle 30 is started when these preparations are completed, the vacuum blower 32 operates in response to this, and the vacuum suction force generated by this operation is the air filter 33 and the suction hose 34. , Through the water separation tank 35, the water suction hose 36, and the suction port 37 to the main branch pipe 20. And the suction port 3 in the main branch 20
When the pressure on the 7 side falls, for example, by about 0.4 atm and becomes negative pressure, the earth and sand 21 accumulated in the main branch pipe 20 is sucked to the negative pressure side, and water is sucked from the water bucket 24. As a result, a part of the earth and sand 21 is sucked into the intake port 37 by the suction air flow or the like, and water flows into the rear side of the valve 22 side of the earth and sand 21 through the meter inlet pipe 23 so that the earth and sand 21 moves to the intake port 37 side. Pushed out.

When suction is further continued, the meter inlet pipe 2
The remaining portion of the earth and sand 21 is also washed away cleanly by the suctioned water flow or the like that has flowed into the main branch pipe 20 via 3 and is sucked into the suction port 37. Then water bucket 24
When is empty, the supply of water is stopped and the outside air instead flows into the main branch pipe 20 via the meter inlet pipe 23. As a result, the residual water in the main branch pipe 20 is also sucked and discharged from the suction port 37.

Then, the earth and sand 21 and the like sucked from the suction port 37 to the vacuum excavator 30 are sent in the reverse order of the vacuum suction force transmission path. As a result, the water is separated by the water separation tank 35, the soil 21 is captured by the air filter 33, and the air is discharged from the vacuum blower 32 to the outside.

When a plurality of usable meter-in pipes 23 are found, the above-mentioned vacuum suction work is performed by switching the object from the meter-in pipe 23 closer to the suction port 37 to the distant meter-in pipe 23 in order. By dividing the valve 22 of the main branch pipe 20 and the suction port 37 into small pieces to remove foreign substances, the vacuum suction work from the suction port 37 only once makes it far from the suction port 37. The earth and sand 21 can also be sucked and discharged.

A concrete configuration of the best embodiment of the apparatus for eliminating foreign matter in a buried pipe of the present invention will be described with reference to the drawings. FIG. 2 is a diagram showing a state in which this device is applied to a gas conduit.

The vacuum excavator 40 includes a vacuum blower 32 as vacuum suction means and a water separation tank 3 as water separation means.
The vacuum excavator 30 in the first embodiment shown in FIG. 1 is a suction valve 41, a water suction valve 42, a pressure feed valve 43, a throttle valve 44, and a water feed valve 45. And a water supply hose 46 are added as a water supply means. Therefore, the same components are designated by the same reference numerals, and the description thereof will be omitted.

The suction valve 41 has a suction hose 34 having two ports.
Is a three-way valve with one port open to the atmosphere,
At the time of vacuum suction, the suction hose 34 is switched to the conductive state to switch the vacuum suction force of the air filter 33 side to the water separation tank 35 side, while at the time of water transmission, the air filter 33 side is communicated to the outside air and the water separation tank 35
The one that closes the side.

The water suction valve 42 is a two-way valve inserted in the water suction hose 36, and when the vacuum suction is performed, the water suction hose 36 is brought into a conducting state so that the vacuum suction force on the water separation tank 35 side is sucked into the suction port 3.
It is switched so that it is transmitted to the 7 side, while it is switched so that it is closed when water is sent.

The input port of the pressure feeding valve 43 is the vacuum blower 3
Water separation tank 3 connected to 2 outlets and 1 output port
5 is a three-way valve connected to the upper part of 5 and the other output port is open to the atmosphere. During vacuum suction, the water separation tank 35 is closed and the discharge gas from the vacuum blower 32 is switched to the atmosphere side while being switched. At the time of water supply, the discharge pressure from the vacuum blower 32 can be switched so as to be sent into the water separation tank 35.

The throttle valve 44 has one port connected to the upper portion of the water separation tank 35 and the other port opened to the atmosphere 2
This is a one-way valve, and the throttle opening is set or adjusted so that the inside of the water separation tank 35 does not become a high vacuum or a high pressure to an undesired degree.

The water supply valve 45 is a two-way valve provided at the drain port of the water separation tank 35, and is closed during vacuum suction, while connecting the drain port of the water separation tank 35 and the water supply hose 46 during water supply. It is a thing.

The water supply hose 46 has one end connected to the water supply valve 45 and the other end extending to the water bucket 24. At the time of water supply, the water sent from the water separation tank 35 is supplied to the water bucket 24.
Can be delivered to.

The specific operation of the device for removing foreign matter in a buried pipe according to the second embodiment will be described.

First, the suction valve 41, the water suction valve 42, and the pressure feed valve 4
3, the throttle valve 44, and the water supply valve 45 are set in a switched state during vacuum suction. Then, the vacuum excavator 4
0 is exactly the same as the vacuum excavator 30 in the first embodiment. Therefore, I will omit the detailed explanation again, but first
In the same manner as in the embodiment, it is possible to perform the discharging operation for the earth and sand 21 accumulated in the main branch pipe 20.

However, the sand 21 may not be completely discharged even if the discharging work is performed until the water bucket 24 becomes empty because the sand 21 is too much or the water bucket 24 is too small.

In such a case, next, the suction valve 41, the water suction valve 42, the pressure feeding valve 43, the throttle valve 44 and the water feeding valve 45 are switched to the water feeding side. Then, the water separation tank 35 is closed from the intake port 37 and the air filter 33, while the outside air passes through the suction valve 41 and the air filter 33 and the engine 3
1 is supplied to the vacuum blower 32 which is being driven. Then, the air supplied to the vacuum blower 32 is blown by the discharge port, and the blowing pressure is sent into the water separation tank 35 via the pressure feeding valve 43. Therefore, since the pressure in the water separation tank 35 increases, the water in the water separation tank 35 is pressure-fed to the water bucket 24 through the drain port of the water separation tank 35, the water supply valve 45, and the water supply hose 46 in order.
As a result, the water separated and stored in the water separation tank 35 can be quickly and easily recirculated to the water bucket 24 on the meter inlet pipe 23 side.

Then, when the water bucket 24 is filled with water, the suction valve 41, the water suction valve 42, the pressure feed valve 43, and the throttle valve 4
4 and the water supply valve 45 are returned to the vacuum suction side state,
It is possible to perform the discharging work for the earth and sand 21 accumulated in the main branch pipe 20. In this way, every time the vacuum suction and the water supply are alternately repeated, the earth and sand 21 accumulated in the main branch pipe 20 is rapidly reduced. Then, finally, all the foreign matters can be discharged.

[0056]

As is apparent from the above description, in the method of eliminating foreign matter in a buried pipe according to the first solution of the present invention, the opening provided in the branch pipe on the ground is the second of the buried pipes. By using it as a substitute for the exposed end of the above, there is an advantageous effect that foreign matter in the pipe can be eliminated by vacuum suction even with respect to the buried pipe exposed only at one end.

Further, in the method for eliminating foreign matter in the buried pipe according to the second solution of the present invention, the foreign matter is divided and discharged little by little, so that the foreign matter in the pipe is also suctioned by vacuum suction even for the buried pipe exposed at one end. Has the advantageous effect of being able to eliminate.

Further, in the method for removing foreign matter in a buried pipe according to the third solution of the present invention, water is made to flow in, so that foreign matter in a pipe can be efficiently removed by vacuum suction even for a buried pipe exposed only at one end. There is an advantageous effect that it is possible.

Further, in the apparatus for removing foreign matter in a buried pipe according to the fourth solution of the present invention, the water separated from the suctioned matter is returned as inflow water, so that clean water and purified water are not wasted. This has an advantageous effect that foreign matter in the pipe can be efficiently removed by vacuum suction of the buried pipe exposed only at one end.

Further, in the apparatus for removing foreign matter in a buried pipe according to the fifth solving means of the present invention, the vacuum excavation device for soil is also used as the apparatus for removing foreign matter in a buried pipe, so that even under difficult circumstances such as transportation. There is an advantageous effect that foreign substances in the pipe can be removed quickly and efficiently by vacuum suctioning the buried pipe exposed at one end without wasting clean water and purified water.

[Brief description of the drawings]

FIG. 1 is a first embodiment of a method for removing foreign matter in a buried pipe according to the present invention.

FIG. 2 is a second embodiment of the apparatus for removing foreign matter in a buried pipe according to the present invention.

FIG. 3 is an example of burying a gas conduit.

[Explanation of symbols] 11 collapsed house 12 working hole 13 working hole 14 valve operating hole 20 main branch pipe (buried pipe) 21 earth and sand (foreign matter) 22 valve 23 meter inlet pipe (branch pipe) 24 water bucket 30 vacuum excavator 31 engine 32 vacuum Blower 33 Air filter 34 Suction hose 35 Water separation tank 36 Water absorption hose 37 Suction port 40 Vacuum excavation vehicle 41 Suction valve 42 Water absorption valve 43 Pressure valve 44 Throttle valve 45 Water supply valve 46 Water supply hose

 ─────────────────────────────────────────────────── ─── 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 buried pipe from a first opening to a second opening of the buried pipe having a first opening and a second opening by vacuum suction of the first opening. A method for eliminating foreign matter in a buried pipe for eliminating foreign matter in a pipe, comprising: providing the first opening at an exposed end of the buried pipe, and the second opening above the branch pipe of the buried pipe. A method for eliminating foreign matter in a buried pipe, characterized by being provided in an extended portion. 2. The method for removing foreign matter in a buried pipe according to claim 1, wherein water is introduced through the second opening. 3. A suction means for vacuum-sucking the first opening of the buried pipe having a first opening and a second opening, and a water separating means for separating water from the suctioned material by the suction means. A device for removing foreign matter in a buried pipe, comprising: water supply means for sending the water separated by the water separating means toward the second opening. Exclusion device.