JPH0673982A - Pipe laying method in ground and laid pipe in ground - Google Patents

Abstract

PURPOSE:To make it possible to easily bury a pipe by forming a pipe into a double pipe of a pipe body and an external pipe, making force-fit of a lubricating agent to a filling layer after a space thereof is filled with fillers 5, and providing a passage injecting the lubricating agent and an outlet hole. CONSTITUTION:A pipe 1 is so constituted that fillers 5 are filled between a pipe body 3 applying a corrosion agent to the peripheral surface and an external pipe 4. A passage 7 is provided to the inside of a filling layer 5 in the direction of the axis of the pipe at an approximate 90 degree interval and, at the same time, a radial outlet hole linked therewith is formed between the filling layer 5 and external pipe 4. Positioning notches 19 and 19a are provided to the external pipe of terminals of the pipes 1 and 1a, and they can be connected at a connecting part 2 with a connection member. After that, when the pipe 1 is buried, if pressure-feed of lubricating oil to the passage 7 from the end is made, the lubricating oil is discharged from an injection hole 8 to the peri-pheral surface of the external pipe 4. According to the constitution, the frictional factors between the peripheral surface of the pipe 1 and a soil are lowered, and the pipe can be easily buried.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for burying a pipe for transporting a fluid such as gas in the ground and a pipe for underground burying used therein.

[0002]

2. Description of the Related Art Conventionally, in order to bury a pipe such as a gas pipe in the ground by a non-excavation method, a hume pipe is previously buried by propulsion work, and then the main pipe is inserted into the hume pipe. It is installed.

[0003]

In such a prior art, it is necessary to bury the Hume pipe in the ground and then insert the main pipe into the Hume pipe. Therefore, it is troublesome twice and the construction period is long. Become. Further, in order to bury the fume pipe, it is necessary to perform propulsion and excavation of a fume pipe having an outer diameter considerably larger than the outer diameter of the main pipe, which requires a large propulsion power and a great cost. Further, the frictional force between the outer peripheral surface of the fume tube and the soil becomes large, so that the fume tube cannot be propelled and buried over a long distance.

An object of the present invention is to provide a method for burying a pipe in the ground with a relatively easy operation and a pipe for burying in the ground.

[0005]

According to the present invention, a filler is interposed between the outer peripheral surface of the pipe body and the inner peripheral surface of the outer pipe, and a passage along the pipe axis is formed in the filler. , This passage communicates with a plurality of pouring holes formed on the outer pipe,
The pipe body is exposed at the end to be joined, and at that end,
For the outer tube, prepare a tube in which a positioning notch is formed,
A pair of half-divided connecting members that cover the exposed portions of the pair of pipe bodies to be joined are prepared, and the connecting members include a coating layer having a passage communicating with each passage of the pipe, and the coating layer. A positioning protrusion that fits into the positioning notch is formed on the outer cover, and the injection member is pumped from the end of the pipe to the passage of the pipe while connecting the pipe with the connecting member. The method of burying a pipe in the ground is to insert the pipe into the ground.

Further, according to the present invention, a filling material is interposed between the outer peripheral surface of the pipe body and the inner peripheral surface of the outer pipe, and a passage along the pipe axis is formed in the filling material. It communicates with a plurality of spout holes formed in the outer pipe, and the pipe body is exposed at the end to be joined, and the outer pipe has positioning notches at the end. It is a pipe for underground burial that is formed.

[0007]

According to the present invention, a filling material such as glass fiber reinforced polyester or concrete is filled between a pipe body such as a steel pipe and an outer pipe such as another steel pipe, and the strength of the outer pipe is increased. The filling material has a passage along the pipe axis formed therein, and the filling material and the outer pipe are provided with a plurality of spouting holes formed in a scattered manner. And the pouring hole are in communication with each other, and when the pipe is thus propelled into the ground to be inserted and buried, an injection material, such as lubricating oil, is pumped from the end of the pipe to the passage of the pipe, Causes the injection material to flow from the pouring hole to the outer peripheral surface of the outer pipe, lowering the coefficient of friction between the outer peripheral surface of the outer pipe and the soil, so that the pipe can be inserted into the ground with a relatively small force. Also, this allows the tube to be inserted into the ground over long distances.

Further in accordance with the present invention, the outer pipe of the pipe is formed with a positioning notch, and in joining such pipes, after connecting the pipe bodies by, for example, welding, a pair of halves is joined. The split connection member is arranged and coated on the outer peripheral surface of the pipe body, and the coating layer forming this connection member has a passage communicating with the passage formed in the filler of the pipe, The outer skin of the connecting member is formed with a positioning protrusion that fits into a positioning notch formed in the outer pipe of the pipe, whereby the positioning protrusion of the outer skin serves as a positioning notch for the outer pipe of the pipe. By fitting, the passage of the connecting member and the passage formed in the filling material of the pipe can communicate with each other. In this way, while connecting a plurality of pipes using the connecting member, Pump the infused material from the edge and remove it as described above. By a small frictional force between, it is possible to insert the tube over long distances in the ground.

[0009]

1 is a perspective view of a part of an embodiment of the present invention. The pipes 1 and 1a are joined at the joining portion 2 and are pushed and pushed into the ground.

FIG. 2 is a sectional view perpendicular to the axis of the pipe 1, and FIG. 3 is a partial sectional view taken along the axial direction of the pipe 1. A filling material 5 is filled and interposed between the pipe main body 3 made of a steel pipe and the outer pipe 4 which is a steel pipe through which the pipe main body 3 is inserted. Filling material 5
May be, for example, glass fiber reinforced polyester or concrete. A coating layer 6 made of polyethylene or the like is attached to the outer peripheral surface of the tube body 3 to protect the tube body 3 from corrosion.

In the filling material 5, a passage 7 extending along the pipe axis is provided.
However, at intervals in the circumferential direction, for example, 9 in this embodiment.
It is formed every 0 degrees. Spout holes 8 extending in the radial direction across the packed bed 5 and the outer tube 4 are formed in a scattered manner, and the spout holes 8 communicate with the passage 7.

Referring to FIG. 4, a starting shaft 9 is excavated in the soil 7, and a hole 11 is formed by a propulsion device 10 in the horizontal direction, while the underground burying pipes 1, 1a, 1b, 1c, 1d are formed. These pipes 1 to 1d are propelled and inserted into the soil 7 by using the jack 13 while continuously joining and supplying the injection material from the injection material supply means 12, and buried. Injection material supply means 1
For example, lubricating oil is pressure-fed at 1 to 10 kg / cm ² from the supply source 15 via the flexible tube 14 as described above. This lubricating oil passes through the passage 7 and from the pouring hole 8 to the outer pipe 4
Is flowed out and interposed between the outer peripheral surface of the and the soil 7, whereby the coefficient of friction is reduced, and it is possible to insert the long pipes 1 to 1d into the soil 7 by the relatively small force of the jack 13. Become.

FIG. 5 is a perspective view of the connecting members 17, 18 used in the connecting portion 2 of the pipes 1, 1a, and FIG. 6 shows a state in which the pipes 1, 1a are connected using the connecting members 17, 18. It is sectional drawing shown. As clearly shown in FIG. 1 described above, the outer pipes 4, 4 of the pair of pipe bodies 1, 1a to be joined are joined together.
Positioning notches 19 and 19a are formed in a.
The passages 7 are formed at equal intervals in the circumferential direction by 90 degrees in this embodiment, and the positioning notches 19a are arranged such that the passages 7 are displaced by 45 degrees in the circumferential direction so that the respective notches 19 are mutually displaced. It is formed every 90 degrees in the circumferential direction.

The connecting members 17 and 18 are coating layers 21 and 22 made of the same material as the above-mentioned filling material 5, and the coating layer 2 thereof.
1 and 22 have steel outer skins 23 and 24 formed on the inner peripheral surface thereof, and the notches 19 and 1 are formed in the outer skins 23 and 24.
Positioning projections 25 and 26 that fit exactly into 9a;
27 and 28 are integrally formed. Connection members 17, 18
The coating layers 21 and 22 are provided with passages 29 and 30 respectively corresponding to the passages 7 of the tube 1. The positioning projections 25, 26; 27, 28 are thus joined to the pipe 1, 1
By fitting the positioning notches 19 and 19a of the outer pipe 4 of a, those passages 29 and 30 communicate with the passages 7 and 7a of the pipes 1 and 1a.

When joining the pipes 1 and 1a to each other, as shown in FIG.
Heat-shrinkable synthetic resin tube 31 for one tube 1
With the pipe 1 inserted therethrough, the exposed pipe bodies 3 and 3a are welded and connected at their end faces 32. Thereafter, the connecting members 17, 18 are arranged on the exposed pipe bodies 3, 3a and the anticorrosion layers 6, 6a, and the positioning protrusions 25, 26; 27, 28 of the connecting members 17, 18 are attached to the pipes. 1,1a
The outer tubes 4 and 4a are fixed to the notches 19 and 19a for positioning by welding. After that, the tube 31 is moved in the axial direction, and by this tube 31, the connecting members 17, 18
Covering the ends of the tubes 1, 1a and heating the tubes completes the bonding operation, as shown in FIG.

FIG. 7 is a perspective view of the injection material supplying means 12. The injection material supply means 12 is arranged at the end of the pipe 1 to which the injection material is to be supplied, and a positioning protrusion 33 that fits into the positioning notch 19 is formed on the mounting member 34.
As a result, the injectable material is pressure-fed to the mounting member 34 from the conduit 14 to the passage 35 corresponding to the passage 7. This passage 35 is positioned corresponding to the passage 7 of the tube 1. In this way, the injection material can be pressure-fed while pressing and propelling the injection material supply means 12, and thus the pipe 1, by the jack 13. Pipe 1a spliced to pipe 1
The same applies to ~ 1d.

FIG. 8 is a perspective view showing a notched part of an injection material supplying means 12a according to another embodiment of the present invention. The tube body 3 of the tube 1 is airtightly closed by the lid 37, and the end portion of the flexible tubular body 38 is fixed by the belt 39 to the outer tube 4 of the tube 1.
Airtightly fixed to the outer peripheral surface of. The flexible tube 1 is attached to the tubular body 38.
4 is connected, and thus the injection material is pumped from the pipe 14. The pressure-fed injecting material is supplied into the passage 7 of the pipe 1, flows along the pipe 7 in the pipe axial direction as described above, and flows out of the pipe 4 through the pouring hole 8.

As another embodiment of the present invention, the heat-shrinkable synthetic resin tube 31 may be omitted.

As the injecting material, mortar, concrete, bentonite or the like as the ground improvement material may be used in addition to the lubricating material such as the lubricating oil as described above, or the backfill material or the like may be used. .

[0020]

As described above, according to the present invention, the filler is filled between the outer peripheral surface of the pipe body and the inner peripheral surface of the outer pipe, and the filler is provided with a passage along the pipe axis. By flowing out the pouring material from this passage to the filling material and the pouring hole formed in the outer tube, the frictional force between the outer peripheral surface of the outer tube and the soil is reduced, and the tube is pushed into the ground with a small force. Or, it can be retracted and inserted into the ground, which allows the pipe to be inserted and buried in the ground over long distances.

According to the invention, the positioning notch formed on the outer pipe of the pipe is fitted with the positioning protrusion formed on the outer skin of the pair of half-divided connecting members for joining the pipe,
In this state, the passage formed in the coating layer of the connecting member communicates with the passage formed in the filling material of the pipe,
In this way, it becomes possible to insert a long pipe into the ground.

As the injection material, in addition to lubricant such as lubricating oil,
A ground improvement material and a backfill material are used, whereby the space of the soil facing the outer peripheral surface of the outer pipe is filled with the injection material, and the ground is prevented from loosening, and thus the ground surface is prevented from sinking.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a state in which pipes 1 and 1a of one embodiment of the present invention are connected.

2 is a sectional view of the tube 1 taken along the line II-II in FIG.

FIG. 3 is a cross-sectional view showing a part of the configuration of the tube 1 along the axial direction.

FIG. 4 is a cross-sectional view showing a state in which the pipes 1 to 1d are propelled and inserted into the soil 7 and buried.

5 is a perspective view of connection members 17 and 18. FIG.

FIG. 6 is a cross-sectional view showing a state in which pipes 1 and 1a are connected using connecting members 17 and 18.

FIG. 7 is a perspective view of an injection material supplying means 12.

FIG. 8 is a perspective view showing a partially cutaway injection material supplying means 12a according to another embodiment of the present invention.

[Explanation of symbols]

 1, 1a to 1d Pipe 2 Connection part 3, 3a Pipe body 4 Outer pipe 5 Filler 6 Corrosion protection layer 7 Passage 8 Pouring hole 12, 12a Injection material supply means 13 Heat-shrinkable synthetic resin tube 17, 18 Connection Member 19, 19a Positioning notch 25, 26; 27, 28 Positioning protrusion

Claims (2)

[Claims] 1. A filler is interposed between the outer peripheral surface of the pipe body and the inner peripheral surface of the outer pipe, and a passage along the pipe axis is formed in the filler, and the passage is formed in the outer pipe. The pipe body communicates with a plurality of spouting holes formed in a scattered manner, the pipe body is exposed at the end to be joined, and a positioning notch is formed in the outer pipe at the end. A pipe is prepared, and a pair of half-divided connecting members that cover the exposed portions of the pair of pipe main bodies to be joined are prepared. The connecting member includes a coating layer having a passage communicating with each passage of the pipe. , A covering for covering the coating layer, and a positioning protrusion that fits into the positioning notch is formed on the outer covering. While connecting the pipe with the connecting member, the pipe is injected from the end of the pipe into the passage of the pipe. A method of burying a pipe in which the material is pumped and the pipe is inserted into the ground. 2. A filler is interposed between the outer peripheral surface of the pipe body and the inner peripheral surface of the outer pipe, and a passage along the pipe axis is formed in the filler, and the passage is formed in the outer pipe. The pipe body communicates with a plurality of spouting holes formed in a scattered manner, the pipe body is exposed at the end to be joined, and a positioning notch is formed in the outer pipe at the end. Underground burial pipe characterized in that.