JP3074066B2 - Underground burial method of pipe and pipe for burial - Google Patents

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 burying the ground used therein.

[0002]

2. Description of the Related Art Conventionally, in order to bury a gas pipe or the like in the ground by a non-cutting method, a fume pipe is buried in advance by propulsion work, and then a main pipe is inserted into the fume pipe. Has been installed.

[0003]

In such prior art, after the fume pipe is buried in the ground, the main pipe must be inserted into the fume pipe, so that it is troublesome twice and the construction period is long. Become. Further, in order to bury the fume pipe, it is necessary to protrude and excavate 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 large cost. In addition, the frictional force between the outer peripheral surface of the fume pipe and the soil increases, so that the fume pipe cannot be propelled and buried over a long distance.

[0004] It is an object of the present invention to provide a method and a tube for burying a tube in the ground with relatively easy operation.

[0005]

According to the present invention, a filler is interposed between an outer peripheral surface of a tube main body and an inner peripheral surface of an outer tube, and a passage along a pipe axis is formed in the filler. , This passage communicates with a plurality of discharge holes formed scattered in the outer tube,
The pipe body is exposed at the end to be joined, and at that end,
For the outer tube, prepare a tube in which the positioning notch is formed,
Prepare a pair of halved connection members covering the exposed portions of the pair of pipe bodies to be joined, this connection member comprises a coating layer having a passage communicating with each passage of the pipe, and a coating layer having the same. A covering projection, and a positioning projection that fits into the positioning notch is formed on the skin, and while the pipe is connected by a connecting member, the injection material is pressure-fed from the end of the pipe to the passage of the pipe. This is a method of burying a pipe underground by inserting the pipe into the ground.

Further, according to the present invention, a filler is interposed between an outer peripheral surface of a pipe main body and an inner peripheral surface of an outer pipe, and a passage along a pipe axis is formed in the filler. It communicates with a plurality of spouting holes formed scattered in the outer tube, and the tube main body is exposed at the joined end, and at the end, a notch for positioning is formed in the outer tube. It is an underground pipe characterized by being formed.

[0007]

According to the present invention, a filler such as glass fiber reinforced polyester or concrete is filled between a pipe main body such as a steel pipe and an outer pipe such as another steel pipe. In the filling material, a passage is formed along the pipe axis, and the filling material and the outer tube are provided with a plurality of spouting holes formed in a dotted manner. When the pipe is propelled into the ground and inserted and buried, an injection material, for example, lubricating oil or the like is pumped from the end of the pipe into the passage of the pipe. As a result, the injection material flows from the pouring hole to the outer peripheral surface of the outer tube, and the coefficient of friction between the outer peripheral surface of the outer tube and the soil decreases, so that the tube can be inserted into the ground with relatively small force. This also allows the tube to be inserted into the ground over long distances.

Further, according to the present invention, a notch for positioning is formed in the outer pipe of the pipe. In joining such pipes, after connecting the pipe main bodies by, for example, welding or the like, a pair of half pipes is formed. A split-shaped connecting member is arranged and coated on the outer peripheral surface of the pipe main body, and a coating layer forming the connecting member has a passage formed therein which communicates with a passage formed in the filler of the pipe, On the outer skin of the connection member, positioning projections are formed to fit into the positioning notches formed on the outer tube of the tube, whereby the positioning projections of the outer skin are inserted into the positioning notches of the outer tube of the tube. By fitting, the passage of the connecting member and the passage formed in the filling material of the tube can communicate with each other. In this way, a plurality of tubes are connected using the connecting member, and Pump the injection material from the end, and By a small frictional force between, it is possible to insert the tube over long distances in the ground.

[0009]

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

FIG. 2 is a cross-sectional view of the tube 1 at right angles to the axis, and FIG. 3 is a cross-sectional view of a part of the tube 1 along the axial direction. A filler 5 is filled and interposed between a pipe main body 3 made of a steel pipe and an outer pipe 4 that is a steel pipe through which the pipe main body 3 is inserted. Filler 5
May be, for example, glass fiber reinforced polyester or concrete. A coating layer 6 such as polyethylene is attached to the outer peripheral surface of the tube main body 3 so as to prevent corrosion of the tube main body 3.

In the filling material 5, a passage 7 extending in the axial direction of the tube is provided.
However, at intervals in the circumferential direction, for example, 9
It is formed every 0 degrees. Spout holes 8 extending in the radial direction over the filling layer 5 and the outer tube 4 are formed interspersed, 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 in a horizontal direction by a propulsion device 10, while the underground pipes 1, 1a, 1b, 1c, 1d are formed. These pipes 1 to 1d are continuously inserted, buried and buried in the soil 7 by using the jack 13 while supplying the injection material from the injection material supply means 12. Injection material supply means 1
As described above, for example, lubricating oil is pressure-fed to ² from a supply source 15 via a flexible tube 14 at 1 to 10 kg / cm ² . The lubricating oil passes through the passage 7 and flows out of the discharge hole 8 into the outer pipe 4.
Flowed out between the outer peripheral surface and the soil 7, whereby the coefficient of friction is reduced, and the relatively small force of the jack 13 makes it possible to insert the long pipes 1-1 d into the soil 7. Become.

FIG. 5 is a perspective view of connecting members 17 and 18 used in the connecting portion 2 of the tubes 1 and 1a. FIG. 6 shows a state where the tubes 1 and 1a are connected using the connecting members 17 and 18. FIG. As clearly shown in FIG. 1 described above, the outer tubes 4, 4 of the pair of tube bodies 1, 1a to be joined.
In a, positioning notches 19, 19a are formed.
In this embodiment, the passages 7 are formed at regular intervals shifted by 90 degrees in the circumferential direction, and the positioning notches 19a are such that the passages 7 are shifted by 45 degrees in the circumferential direction, and the notches 19 are mutually connected. It is formed every 90 degrees in the circumferential direction.

The connecting members 17 and 18 are composed of coating layers 21 and 22 made of the same material as
1 and 22 have steel outer skins 23 and 24 formed on the inner peripheral surface, and the outer skins 23 and 24 have the notches 19 and 1 respectively.
Positioning projections 25, 26 that fit perfectly into 9a;
27 and 28 are formed integrally. Connection members 17, 18
The passages 29 and 30 corresponding to the passages 7 of the pipe 1 are formed in the coating layers 21 and 22 of FIG. Thus, the pipes 1, 1 to which the positioning projections 25, 26;
By fitting into the notches 19, 19a for positioning of the outer tube 4, the passages 29, 30 communicate with the passages 7, 7a of the tubes 1, 1a.

In joining the pipes 1 and 1a, FIG.
A heat-shrinkable synthetic resin tube 31 as shown in FIG.
While the pipe 1 is inserted through the pipe body, the exposed pipe bodies 3 and 3a are connected by welding at their end faces 32. Thereafter, the connecting members 17 and 18 are arranged on the exposed pipe main bodies 3 and 3a and the anticorrosion layers 6 and 6a, and the positioning projections 25 and 26; 1,1a
Are fixed to the positioning notches 19, 19a of the outer tubes 4, 4a by welding. Thereafter, the tube 31 is moved in the axial direction, and the connecting members 17 and 18 are moved by the tube 31.
By covering the tube and the ends of the tubes 1 and 1a and heating the tube, the joining operation is completed as shown in FIG.

FIG. 7 is a perspective view of the injection material supply means 12. The injection material supply means 12 is disposed at an end of the tube 1 to which the injection material is to be supplied, and a positioning projection 33 that fits into the positioning notch 19 is formed on the mounting member 34.
As a result, the injection material is pressure-fed to the mounting member 34 from the conduit 14 to the passage 35 corresponding to the passage 7 as described above. 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 the jack 13 presses and propelles the injection material supply means 12 and thus the tube 1. Pipe 1a joined to pipe 1
The same applies to １1d.

FIG. 8 is a partially cutaway perspective view showing an injection material supply means 12a according to another embodiment of the present invention. The pipe main body 3 of the pipe 1 is airtightly closed by a lid 37, and the end of the flexible cylindrical body 38 is fixed to the outer pipe 4 of the pipe 1 by a belt 39.
Airtightly fixed to the outer peripheral surface of. This tube 38 has a flexible tube 1
4 is connected, and thus the injection material is pumped from the pipe 14. The pumped injection material is supplied into the passage 7 of the tube 1, flows through the passage 7 along the tube axis direction as described above, and flows out of the discharge hole 8 to the outside of the tube 4.

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

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

[0020]

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

According to the present invention, the positioning notch formed on the outer tube of the tube is fitted with the positioning projection formed on the outer skin of a pair of half-shaped connecting members for joining the tube.
In this state, the passage formed in the coating layer of the connection member communicates with the passage formed in the filler of the pipe,
In this way, a long tube can be inserted into the ground.

As an injection material, in addition to a lubricant such as a lubricating oil,
A soil 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 to prevent the ground from loosening, thereby preventing the ground surface from sinking.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a state in which tubes 1 and 1a according to an embodiment of the present invention are connected.

FIG. 2 is a cross-sectional view taken along a line II-II of FIG.

FIG. 3 is a cross-sectional view showing a partial configuration of the pipe 1 along an axial direction.

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

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

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

FIG. 7 is a perspective view of the injection material supply means 12;

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

[Explanation of symbols]

 1, 1a to 1d pipe 2 connecting part 3, 3a pipe main body 4 outer pipe 5 filler 6 anticorrosion layer 7 passage 8 pouring hole 12, 12a injection material supply means 13 heat-shrinkable synthetic resin tube 17, 18 connection Member 19, 19a Notch for positioning 25, 26; 27, 28 Projection for positioning

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-5-263587 (JP, A) JP-A-58-50192 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) E21D 9/06 311

Claims (2)

(57) [Claims] A filler is interposed between an outer peripheral surface of a pipe main body and an inner peripheral surface of an outer pipe, and a passage is formed in the filler along the pipe axis. The pipe body communicates with a plurality of spouted holes formed in a dotted manner, and the pipe body is exposed at an end to be joined, and a positioning notch is formed in the outer pipe at the end. Preparing a pipe, preparing a pair of half-split connection members covering the exposed portions of the pair of pipe bodies to be joined, the connection member having a coating layer having a passage communicating with each passage of the pipe; And a covering for covering the coating layer. The covering has a positioning projection formed to fit into the positioning notch, and the tube is connected to the passage of the tube from an end of the tube while being connected by the connecting member. A method of burying pipes underground where pipes are inserted underground by pumping materials. 2. A filler is interposed between an outer peripheral surface of a pipe main body and an inner peripheral surface of an outer pipe, and a passage is formed in the filler along the pipe axis. The pipe body communicates with a plurality of spouted holes formed in a dotted manner, and the pipe body is exposed at an end to be joined, and a positioning notch is formed in the outer pipe at the end. An underground pipe characterized by the following: