JPH09112782A - Removal method for foreign matter in buried pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sure removal method for foreign matters which is applicable under such a state as impossible of boring a broad working hole. SOLUTION: This is a removal method for foreign matters in a buried pipe by which the foreign matters 21 in the buried pipe from a first punch hole 230 to a second punch hole 23 are removed by directly or indirectly vacuum sucking the first punch hole 230 of the buried pipe 20, which is provided with the first punch hole 230 and the second punch hole 23, and after a first vacuum suction is performed on the basis of the vertical position of the first punch hole 230, a second vacuum suction is performed on the basis of the vertical position in the inner bottom of the buried pipe 20.

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 conduit or a water conduit 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 An example of a gas conduit for supplying city gas will be described with reference to FIG. 6. In the ground such as a sidewalk, for example, a main pipe or branch pipe (hereinafter referred to as main branch pipe) A having a diameter of about 100 mm is located at a depth of about 1 m. The main pipe A is provided with a supply pipe outlet B, and the main pipe A is connected to the main pipe A through the supply pipe outlet B. C extends horizontally in the private land. 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 is accumulated in the gas conduit together with a large amount of earth and sand, or if the water that has flowed out of the damaged portion is clogged with the earth and sand in the damaged water conduit, the method described above 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 and the like are covered on the road above the buried pipe to be excluded, and it may not be possible to excavate a work hole at a desired location.

[0008] Therefore, as one of the lifeline recovery operations from a disaster such as an earthquake, a foreign substance inside the buried pipe in which a work hole having a sufficient width for cutting the buried pipe cannot be excavated. It is a challenge to establish a method to eliminate such problems and also to equip them with working methods and tools to carry out the method efficiently.

Further, just because a quick recovery work is required, it is not possible to complete the work while removing foreign matter halfway. Therefore, even under the above-mentioned situation, it is necessary to reliably remove the foreign matter, which is also a problem.

The present invention has been made in order to solve such a problem, and it is an object of the present invention to provide a method for reliably removing foreign matter in a buried pipe, which can work even in a situation where it is impossible to dig a wide working hole. To aim.

[0011]

The constitution, operation and effect of the first to third solving means 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 time of filing the application) is such that the first perforation hole and the second perforation hole are different from each other. Exclusion of foreign matter in a buried pipe by directly or indirectly vacuuming the first drilled hole of the provided buried pipe to remove foreign matter in the buried pipe from the first drilled hole to the second drilled hole The method is characterized by performing a first vacuum suction based on a vertical position of the first perforation hole and then performing a second vacuum suction based on a vertical position of the inner bottom surface of the buried pipe. Is the way to do it.

Here, "perforation hole provided in the buried pipe"
May be an existing perforation hole such as a supply pipe outlet connection hole,
The hole may be a new hole drilled by a drilling machine or the like, but it is necessarily provided in the upper portion of the buried pipe due to the condition of the buried pipe.

In the method for removing foreign matter in the buried pipe according to the first solving means, when vacuum suction is performed from the first hole, the inside of the buried pipe becomes a negative pressure and the second hole is drilled. Outside air flows into the buried pipe through the. Then, the inflowing air carries the foreign matter in the pipe to the first perforation hole side, and is vacuum sucked and discharged.

As a result, the first perforated hole of the buried pipe acts as a substitute for the exposed end for vacuum suction, and the second perforated hole of the buried pipe acts as a substitute for the exposed end for inflow of outside air. Even if only a small hole can be dug due to the restriction of excavation around the buried pipe due to the presence of damaged buildings such as condominiums and expressways on the ground above due to an earthquake, etc. It is possible to perform vacuum suction using the.

[0016] First, the first vacuum suction is performed with reference to the vertical position of the first drilled hole. At this time, a suction port that fits the drilled hole and has a diameter as large as possible is used. It is possible to efficiently remove the foreign matter in the tube via this. Moreover, since the reference of the vertical position is the position of the perforation hole, the fixture of the suction port and the like can be unified regardless of the diameter of the buried pipe and the like.

Further, after that, the second vacuum suction is performed with reference to the vertical position of the inner bottom surface of the buried pipe. At this time, since the reference of the vertical position is the inner bottom surface of the pipe, the second vacuum suction is performed from above in the first vacuum suction. Even foreign matter such as water remaining on the inner bottom of the buried pipe without being discharged by suction can be reliably sucked and discharged.

Therefore, according to the present invention, the foreign matter in the pipe can be surely removed by vacuum suction even for the buried pipe in which the working hole having a sufficient width for cutting the buried pipe cannot be excavated.

[Second Solving Means] The second method for eliminating foreign matter in a buried pipe (as described in claim 2 at the beginning of the application) is the first method for eliminating foreign matter in a buried pipe. Then, the second vacuum suction is performed from the other end of the insertion tube, one end of which is inserted into the buried tube through the first perforation hole.

In the method for eliminating foreign matter in the buried pipe according to the second solving means, the insertion pipe for vacuum suction is first provided.
Insert the insertion tube into the drilled hole, and push the insertion tube as deeply as possible. Then, the tip of the insertion pipe reaches the inner bottom of the embedded pipe. When vacuum suction is performed from the other end of the insertion tube, foreign matter is sucked into the inner cavity of the insertion tube from one end of the insertion tube. As a result, the foreign matter on the inner bottom of the buried pipe is sucked and discharged. That is, it is possible to easily perform the second vacuum suction based on the vertical position of the inner bottom surface of the embedded pipe simply by pushing in the insertion pipe. Moreover, the suction accessory such as the insertion tube can be unified regardless of the diameter of the buried tube.

Therefore, according to the present invention, it is easy to surely remove foreign matter in a pipe by vacuum suction even for a buried pipe in which a work hole having a sufficient width for cutting the buried pipe cannot be excavated. it can.

[Third Solving Means] The third method for eliminating foreign matters in a buried pipe (as described in claim 3 at the beginning of the application) is the second method for eliminating foreign matters in a buried pipe. Then, water is injected into the buried pipe through the second perforation hole during the first vacuum suction, and this water injection is stopped during the second vacuum suction. .

In the method for eliminating foreign matter in the buried pipe according to the third solving means, when vacuum suction is performed from the first hole side of the buried pipe, a negative pressure is generated in the buried pipe, Second
Water poured from the outside through the perforated holes of the above flows into the buried pipe. Then, the foreign matter in the pipe is carried to the first perforation hole side of the buried pipe by this inflow water, vacuumed and discharged.

When water is introduced from the opposite side of suction to fill the gaps such as sand with water in this way, the negative pressure suction force is increased, so that the ability to discharge foreign matters such as sand is enhanced. 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 foreign matter discharge efficiency in the first vacuum suction is improved.

On the other hand, since the water injection is stopped at the time of the second vacuum suction, a large discharge capacity as in the case of water injection is not required. From this, even with vacuum suction using an insertion tube having a thin lumen that can be inserted into the perforation hole, it is possible to suck and discharge residual water and the like in the embedded tube. Therefore, even with the method of eliminating foreign matter in the buried pipe that involves water injection,
The second vacuum suction reliably discharges the foreign matter.

Therefore, according to the present invention, foreign matter in a pipe can be reliably and efficiently removed by vacuum suction even for a buried pipe in which a work hole having a sufficient width for cutting the buried pipe cannot be excavated. You can

[0027]

BEST MODE FOR CARRYING OUT THE INVENTION A first embodiment of a method for removing foreign matter in a buried pipe according to the present invention will be described with reference to the drawings. This is an example of a case in which a simple device is inserted into the hole on the vacuum suction side for vacuum suction. FIG. 1 is a view showing a state in which this method is applied to a gas conduit, and FIG. 2 is a detailed view around the perforation hole.

In order to promptly restore the gas conduit after a large earthquake, a work of discharging the earth and sand 21 as foreign matter remaining in the main branch pipe 20 as a buried pipe out 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,
Not only is it impossible to form the exposed end for connecting the vacuum suction port by excavating the working hole 12 and cutting the main branch pipe 20 exposed there, but also another exposure for introducing the outside air and the like which is paired with this. A situation arises in which it is also not possible to excavate the working hole 13 required to form the edge. That is, it is not possible to eliminate foreign matter in the buried pipe by utilizing the exposed end (see FIG. 5).

Under these circumstances, the vacuum excavator 30 is used to dig a small hole 120 up to the main branch pipe 20 instead of the working hole 12 through the gap of the collapsed house 11 or the like. Then, using a punching machine or the like, a punching hole 230 is punched on the upper surface of the main branch pipe 20 at the bottom of the fine hole 120, and the punching hole 230 is also tapped with a punching machine adapter or the like. As a result, a hole 230 (first hole) for vacuum suction is formed.

After that, the outer diameter is slightly smaller than the inner diameter of the perforation hole 230, the inner cavity 370a is formed thicker, and the collar portion 370b functioning as a stopper is provided in the central portion, which is deformed by negative pressure during vacuum suction. A gap cover 370c, which is an elastic / flexible member such as rubber or plastic that performs a sealing function by being adsorbed in the gap, carries the perforated insert 370 added below the collar portion 370b. Then, in the fine hole 120, the perforation insert 370 is inserted into the perforation hole 230 with the gap cover 370c side facing downward. Further, the suction port 37 of the vacuum excavator 30 is connected to the upper end of the perforation insert 370. As a result, preparation is completed on the side of the drilled hole 230 for performing vacuum suction in the vacuum excavating vehicle 30 (see FIG. 2 (a)).

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, and the main branch pipe 20 is closed 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, in the gap of the collapsed house 11 or the like, between the valve 22 and the suction port 37, the small hole 1 up to the main branch pipe 20 is formed.
Dig 30. Then, using a punch, etc.,
A perforation hole 23 is perforated on the upper surface of the main branch pipe 20 at the bottom of 30, and the perforation hole 23 is also tapped with a perforation adapter or the like. As a result, a perforation hole 23 (second perforation hole) for introducing outside air or the like is formed.

When the engine 31 of the vacuum excavation vehicle 30 is started when these preparations are completed, the vacuum blower 32 is activated in response to this, and the vacuum suction force generated thereby is generated by the air filter 33 and the suction hose 34. , The water separation tank 35, the water suction hose 36, the suction port 37, and the inner cavity 370a of the perforation insert 370, and is transmitted to the main branch pipe 20. Then, when the suction port 37 side in the main branch pipe 20 is lowered to a negative pressure by, for example, about 0.4 atm, the earth and sand 21 retained in the main branch pipe 20 is sucked to the negative pressure side. As a result, part of the earth and sand 21 is sucked into the suction port 37.

Further, when water is poured from the perforation hole 23 with a bucket or a hose while suction is continued, the earth and sand 21 is caused by the suctioned water flow etc. which has flowed into the main branch pipe 20 from the perforation hole 23 one after another.
The remaining part of the is washed away cleanly and sucked into the suction port 37. After that, when the water injection is stopped, the outside air flows into the main branch pipe 20 through the perforation hole 23. Then, the residual water in the main branch pipe 20 is also sucked and discharged from the suction port 37 through the perforation hole 230. At least the supernatant portion of the residual water is sucked and discharged, although it depends on the ratio of the diameter of the drilled hole and the diameter of the buried pipe.

This completes the first vacuum suction (first vacuum suction) for the time being, and then the next vacuum suction (second vacuum suction).
Prepare for.

That is, from the hole 230 to the hole insert 37.
0 is pulled out, and the perforation insert 371 is inserted instead. The piercing insert 371 is made of the same material as the piercing insert 370, such as rubber or plastic having a tapered inner lumen 371b formed in the inner lumen 370a so as to exhibit airtightness and easy insertion. The inner tube 371a made of a member is fixed. The perforation insert 371 is attached to the tapered lumen 37.
The large diameter portion 1b is placed in the hole 230 so that the large diameter portion faces upward.

Further, in addition to this, the outer diameter is smaller than the large diameter of the tapered inner cavity 371b and larger than the smaller diameter, the length is longer than the diameter of a general buried pipe, and the inner cavity 370a is located between the front end and the rear end. A large diameter portion 372c having the same diameter as that of the perforating insert 371 for compatibility, and carries in the insertion tube 372 formed at the rear end. . Then, within the narrow hole 120, the distal end of the insertion tube 372 on the side of the cutout portion 372b is provided with a taper lumen 371b of the perforation insert 371.
And the tip of the insertion pipe 372 is inserted into the main branch pipe 20.
Insert the insertion tube 372 until it abuts the inner bottom surface. Then, the suction port 37 of the vacuum excavator 30 is connected to the large diameter portion 372c of the insertion tube 372. As a result, the vacuum excavator 30 is ready to resume vacuum suction (see FIG. 2 (b)).

When the vacuum suction by the vacuum excavator 30 is restarted, the water and the like remaining in the main branch pipe 20 are sucked into the vacuum excavator 30 via the insertion pipe 372 with almost no water remaining at the bottom. To be done.

The earth and sand 21 and water thus sucked into the vacuum excavator 30 from the suction port 37 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. As a result, the earth and sand 21 and water in the main branch pipe 20 between the drill holes 23 and 230 are removed. Then, after the foreign matter is removed, the perforation hole 23 and the perforation hole 230 are closed with a plug or the like, and the entire work is completed.

A method of using the second embodiment of the method for removing foreign matter in a buried pipe according to the present invention will be described with reference to the drawings. This is an example of a case in which standing tubes are erected in both the vacuum suction side perforation holes and the outside air inflow side perforation holes to perform vacuum suction. FIG. 3 is a view showing a state in which this method is applied to a gas conduit, and FIG. 4 is a detailed view around the vacuum suction side drill hole.

The overlapping description will be omitted, and the difference from the first embodiment will be described. The first point is that the lower end of the standing pipe 24 is screwed into the drilled hole 23 after the screw is formed to stand the standing pipe 24. At the same time, the lower end of the standing pipe 240 is also screwed into the drilled hole 230 after the screw is formed to stand the standing pipe 240. The second difference is that the vacuum suction using the insertion tube (second vacuum suction) is different from the operation using the insertion tube 241 and the insertion tube 2
42 in combination with the work.

Therefore, vacuum suction without using the insertion tube (first
Vacuum suction) is performed by connecting the suction port 37 of the vacuum excavator 30 to the upper end of the vertical pipe 240 (FIG. 4A).
reference). By performing vacuum suction through the vertical pipe 240 whose upper end is on the ground, it is possible to prevent the inflow of excess earth and sand and to facilitate the work such as attaching the suction port. Also, by injecting water or the like through the vertical pipe 24 whose upper end is also on the ground, the inflow of excess earth and sand and the like can be prevented and the operation of water injection and the like can be facilitated. By such vacuum suction, the earth and sand 21 in the main branch pipe 20 and at least the supernatant portion of the residual water are quickly sucked and discharged from the suction port 37 via the inner cavity 240a of the standing pipe 240.

Next, the outer diameter of the standing pipe 24 is increased for airtightness.
0 is slightly smaller than the diameter of the lumen 240a, and the length is 24
Longer than the sum of the length of 0 and the diameter of a general buried pipe, a thicker bore 241a penetrates between the lower end and the upper end, and a bolt 241b is provided to prevent the lower end of the bore from being sealed at the time of contact.
Is inserted in the lower end, and for compatibility, an insertion pipe 241 having a large diameter portion 241c having the same outer diameter as that of the vertical pipe 240 formed in the upper end is inserted into the vertical pipe 240. Further, the suction port 37 of the vacuum excavation vehicle 30 is connected to the large diameter portion 241c of the insertion tube 241 to prepare for resumption of vacuum suction in the vacuum excavation vehicle 30 (FIG. 4).
(B) See FIG.).

When the vacuum suction by the vacuum excavator 30 is resumed, the water and the like remaining in the main branch pipe 20 is quickly evacuated to the vicinity of the bottom through the thick inner cavity 241a of the insertion pipe 241. It is sucked by the excavator 30.

After that, the outer diameter of the vertical pipe 24 is changed for airtightness.
0 is slightly smaller than the diameter of the lumen 240a, and the length is 24
The lower end portion is longer than the sum of the length of 0 and the diameter of a general buried pipe, and a narrow inner lumen 242a penetrates between the lower end and the upper end so that the inner end of the lumen can be surely contacted even on a curved surface. Has a large chamfer, and a notch 242b is formed in the lower end to prevent the lower end of the inner cavity from being sealed at the time of contact. The inserted insertion tube 242 is inserted into the vertical tube 240. Further, the suction port 37 of the vacuum excavator 30 is connected to the large diameter portion 242c of the insertion pipe 242.
, And the vacuum excavation vehicle 30 is ready to resume vacuum suction (see FIG. 4C).

When the vacuum suction by the vacuum excavator 30 is restarted again, the water remaining at the bottom of the main branch pipe 20 is
Through the lumen 242a of the insertion tube 242, the vacuum excavator 30 is sucked to almost perfectness in a short time. As a result, the work of removing foreign matter in the main branch pipe 20 can be performed quickly and reliably.

[0047]

As is apparent from the above description, in the method of removing foreign matter in a buried pipe according to the first solution of the present invention, first and second vacuum suctions with different vertical position references are performed. As a result, there is an advantageous effect that foreign matter in the pipe can be surely removed by vacuum suction even for the buried pipe in which a work hole having a sufficient width for cutting the buried pipe cannot be excavated.

Further, in the method for removing foreign matter in the buried pipe according to the second solving means of the present invention, the insertion pipe is used for the second vacuum suction, so that the space is sufficient for cutting the buried pipe. With respect to the buried pipe in which the work hole is not excavated, the foreign substance in the pipe can be easily removed surely by vacuum suction, which is an advantageous effect.

Furthermore, in the method for removing foreign matter in a buried pipe according to the third solution of the present invention, by switching execution / stopping of water injection, a work hole having a sufficient width for cutting the buried pipe or the like. Even for a buried pipe that cannot be excavated, there is an advantageous effect that foreign matter in the pipe can be reliably and efficiently removed by vacuum suction.

[Brief description of the drawings]

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

FIG. 2 is a detailed view thereof.

FIG. 3 is an overall view of a second embodiment of the present invention.

FIG. 4 is a detailed view thereof.

FIG. 5 is an example of a method for removing foreign matter in a buried pipe.

FIG. 6 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 perforation hole (second perforation hole) 24 standing pipe 25 spring 26 ball 27 lid receiving part 28 lid 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 120 Small Hole 130 Small Hole 230 Drilling Hole (First Drilling Hole) 240 Standing Tube 241 Insertion Tube 241a Lumen 241b Bolt 241c Large diameter part 242 Insertion tube 242a Inner cavity 242b Cutout part 242c Large diameter part 370 Perforation insert 370a Inner cavity 370b Collar part 370c Gap cover 371 Perforation insert 371c Inner pipe 371b Tapered inner diameter 371 372a Lumen 372b Cutout 372c Large diameter part

 ─────────────────────────────────────────────────── ─── 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 vacuum suction is directly or indirectly applied to the first perforation hole of the buried pipe provided with the first perforation hole and the second perforation hole, and the second perforation is performed from the first perforation hole. Is a method for removing foreign matter in the embedded pipe up to the perforation hole, wherein the first vacuum suction is performed with reference to the vertical position of the first perforation hole, and then the bottom surface in the embedded pipe For removing foreign matter in a buried pipe, characterized by performing a second vacuum suction based on the vertical position of the 2. The embedding device according to claim 1, wherein the second vacuum suction is performed from the other end of the insertion pipe, one end of which is inserted into the embedding pipe through the first perforation hole. How to eliminate foreign substances in the pipe. 3. The water injection into the buried pipe through the second perforation hole is performed during the first vacuum suction, and the water injection is stopped during the second vacuum suction. The method for removing foreign matter in a buried pipe according to claim 2.