JPH0510073Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to pipe bodies for electric cable installation pipes, gas pipes, water pipes, etc., which are buried underground by the propulsion method.

(Prior art) Conventionally, when installing electric wires, telephone lines, etc. underground, it has been necessary to bury multiple small-diameter pipes in parallel underground and then install them inside the pipes. It is being done.

The method of burying these pipes underground is as follows:
After digging a trench in the ground, multiple small-diameter pipes are laid in the trench in parallel vertically and horizontally, and the gaps between adjacent pipes are filled with concrete to protect the pipes. A method of backfilling, or a method of backfilling after connecting a concrete block body made by burying multiple small diameter pipes in parallel in an excavated trench in a butting state between both ends, or a method of backfilling a large diameter pipe. A method has been adopted in which a hume pipe is buried underground using a propulsion method, and then a plurality of small-diameter pipe bodies are arranged inside the hume pipe, and the voids are filled with concrete.

(Problem to be solved by the invention) However, according to the method of laying a small-diameter pipe body in a trench, or the method of laying a concrete block body having a plurality of small-diameter pipe bodies in a trench, In addition, the method of burying a humid pipe and then placing a small-diameter pipe body inside the humid pipe causes traffic obstructions because it is necessary to excavate roads, etc., and requires a long construction period. ,
Since the work of burying the Huum tube and placing the small-diameter tube must be done separately, it requires a long period of work as described above, and in addition, the installation of the small-diameter tube must be done manually inside the Huum tube. Since this method is carried out using a large diameter tube, there are problems such as the necessity of using a Huum tube with a larger diameter than necessary.

For this reason, the inventors of the present application filed the patent application No. 61-166264.
As described in Japanese Unexamined Patent Publication No. 63-120981, connecting step peripheral parts are provided on the outer peripheral surface of both ends of the pipe main body, and a plurality of small diameter holes are provided inside the pipe main body between both end faces. We have developed a propulsion burial pipe that runs parallel to the length of the pipe.

However, when this pipe body is connected to the rear end of the shield machine and the earth and sand excavated by the shield machine is excavated using the small diameter hole provided in the pipe body and excavated while discharging it with muddy water, the shield machine The shield machine rolls due to the reaction force caused by the rotation of the cutter.

This rolling also extends to the buried pipe, and rolling also occurs in the following pipes, so that the small diameter holes in the pipes as a whole communicate in a spiral shape.

For this reason, when electric wires are disposed in the conduit formed by these small diameter holes and energized, the electric wires become bent and power loss increases.

Such rolling can be prevented, for example, by connecting the front and rear pipe bodies with bolts and nuts, but if the pipe bodies are rigidly connected, directional control and curve propulsion become difficult, reducing workability. A problem arises.

The object of the present invention is to provide a propulsion tube that solves these problems.

(Means for solving the problems) In order to achieve the above object, as shown in the drawings corresponding to the embodiments, the multi-hole thrust pipe of the present invention is characterized in that a circumferential step 5 is provided on the outer circumferential surface of one end of a pipe main body 1 having a plurality of small diameter holes 3 penetrating parallel in the longitudinal direction within the inside of the outer periphery across both end faces, and a collar member 6 having a diameter capable of being fitted into the circumferential step 5 is protruded from the outer circumferential surface of the other end, and further, a pin hole 9 having the same diameter over the entire length is drilled along the length of the pipe main body 1 on one end face of the outer periphery of both end faces of the pipe main body 1, and a pin 13 that can be fitted into the pin hole 9 or a pin hole 9 of the same shape as the pin hole that can be connected by the pin 13 is provided on the other end face, and the fitting portion of the pin 13 into the pin hole 9 is formed so that the diameter of the fitting portion of the pin 13 gradually decreases from approximately the same as the diameter of the pin hole 9 toward the tip.

(Function) When joining the leading pipe main body 1 and the following pipe main body 1 by fitting together the circumferential step 5 and the collar member 6 provided on the opposing surfaces of the pipe main body 1 and the following pipe main body 1. After connecting the rear end surface of the preceding pipe main body 1 and the front end surface of the following pipe main body 1 through pin holes 9 and pins 13, the pipe bodies are sequentially buried underground using the propulsion method. .

In this way, when the outer peripheries of the pipe main bodies 1, 1 are connected using the pin 13, the plurality of small diameter holes 3, 3...3 inserted through the pipe main body 1 can be accurately connected without shifting. In addition to automatic communication, rolling is prevented when the tube is propelled.

In addition, since the pin 13 inserted into the pin hole 13 is formed into a tapered shape, the front and rear tube main bodies 1, 1 can be connected in a bendable manner, and therefore propulsion direction control and curved propulsion can be performed. This makes it easier to install and improves workability.

(Example) To explain the example of the present invention with reference to the drawings, 1
is mainly a concrete pipe with two holes in the center.
A plurality of small-diameter cable holes 3, 3, . . . 3 are formed on the outer circumference with this hole 2 in the center. These holes 2 and 3 extend parallel to each other in the length direction between both end faces of the tube main body 1.

Such a pipe main body 1 is constructed by installing cable installation pipes 4, 4...4 made of vinyl chloride pipes in parallel at predetermined intervals in the circumferential direction on the outer periphery of a cylindrical frame, and then constructing them using concrete material. The hole 2 formed in the center by the centrifugal force can be used as a positioning hole for a shield machine, and can also be used as a cable installation pipe. A cable hole 3 is formed by 4.

Further, a circumferential step portion 5 is provided by forming the end of a suitable length portion from one end surface of the tube main body 1 to a small diameter, while an outer diameter is the same as the outer diameter of the tube main body 1 on the outer circumferential surface of the other end. A steel collar member 6 of the same diameter is integrally attached.

This collar member 6 protrudes by an appropriate length from the other end surface of the tube main body 1, and its inner peripheral surface is fitted into the circumferential step portion 5 provided at one end of the tube main body 1 to be connected via an annular rubber packing 7. It is designed to allow

This annular rubber gasket 7 is integrally fixed to the inner circumferential surface of the protrusion of the collar member 6, and on the inner circumferential surface of one end of the collar member 6 is an annular seal 8 made of water-expandable rubber embedded in the pipe main body 1. It is attached as one piece.

Reference numeral 9 denotes a pin hole of an appropriate depth that is bored horizontally in the length direction of the tube body 1 at symmetrical positions on the outer periphery of both end faces of the tube body 1, and is formed to have the same diameter over the entire length and has a hole in the inner wall surface thereof. A cylindrical socket body 10 is inserted.

In the figure, the pin hole 9 is provided at only one location on the end surface of the tube main body 1, but it may be provided at several locations.

Reference numeral 11 denotes a cushion material attached to the outer periphery of the end surface of the tube main body 1.

Reference numeral 12 denotes a backfilling injection hole penetrated through the outer circumferential portion of the pipe main body 1 at appropriate locations, and the appropriate locations are communicated with the outer circumferential surface of the pipe main body 1 to inject an anti-friction material or the like between the pipe main body 1 and the ground. It is something.

13 is a pin to be inserted into the pin hole 9;
The fitting portion to be inserted into the interior from the open end is formed from a diameter approximately equal to the diameter of the pin hole 9 to a gradually smaller diameter toward the tip.

The multi-hole propulsion tube of the embodiment configured in this way is buried underground by a propulsion method, sequentially following a shield machine (not shown), and at that time,
Both pipe bodies 1, 1 are placed opposite each other so that the pin hole 9 provided in the rear end face of the preceding pipe main body 1 and the pin hole 9 provided in the front end face of the pipe main body 1 are aligned in a straight line. 1, one half of the pin 13 is inserted into the pin hole 9 of the pipe main body 1, and the pin hole 9 of the subsequent pipe main body 1 is inserted and fitted.
Insert and fit the other half of the pin 13 into the
At the same time as this pin 13 is attached, by fitting the protruding end of the collar member 6 of the other tube body 1 into the circumferential step 5 of one tube body 1, the small diameter cables 3 of both tube bodies 1 are aligned in a straight line. It is connected and then propelled underground.

During this propulsion, the shield machine and the following tube main body 1 try to roll due to the rotational reaction force of the cutter of the shield machine, but the front and rear tube bodies 1, 1 mutually rotate in the circumferential direction via the pin 13. Since the pin 13 is formed in a tapered shape that gradually becomes smaller in diameter toward the tip, rolling is prevented, and the pin 13 is formed into a tapered shape that gradually becomes smaller in diameter toward the tip, so that the front and rear tube main bodies 1, 1 are aligned with each other. The tubes are connected in a bendable manner via the pin 13, making it easy to control the direction in which the tube is propelled and to propel it around a curve.

In addition, the center hole 2 is used as a positioning hole for the shield machine during propulsion, and is also used as a cable hole 3.
is used as a discharge hole for excavated earth and sand, and furthermore, by injecting an anti-friction material between the pipe main body 1 and the ground through the backfilling injection hole 13, the frictional resistance when the pipe body is propelled is reduced.

After burying a large number of pipe bodies 1 connected in series in this manner, cables are wired into the small diameter cable holes 3.

In addition, in the above embodiment, the pin holes 9, 9 were drilled in both end surfaces of the tube main body 1, and the pin 13 was made into a separate body, but the pin hole 9 was drilled in either end surface,
A pin 13 may be provided protruding from the other end surface.

(Effects of the invention) As described above, according to the propulsion tube of the present invention, the tube main body has a plurality of small diameter holes 3 extending in parallel in the length direction inside the outer periphery between both end faces. A circumferential stepped portion 5 is provided on the outer circumferential surface of one end of the tube main body 1, and a collar member 6 having a diameter that can be fitted into the circumferential stepped portion 5 is provided on the outer circumferential surface of the other end, and further, a collar member 6 is provided on the outer circumferential surface of the other end, and A pin hole 9 having the same diameter over the entire length is bored in one end surface of the tube main body 1, and the other end surface is connected by a pin 13 that can be fitted into the pin hole 9 or the pin 13. A pin hole 9 having the same shape as the possible pin hole 9 is provided, and the portion of the pin 13 that fits into the pin hole 9 is formed from a diameter that is approximately equal to the diameter of the pin hole 9 toward the tip, to a diameter that gradually becomes smaller. because there is,
When burying the pipe bodies 1 one after another in the ground using the propulsion method, the peripheral part 5 and collar member 6 provided on the opposing surfaces of the preceding pipe body 1 and the following pipe body 1 are fitted into each other. The front and rear tube bodies 1, 1 can be easily joined together by fitting the pins 13 into the pin holes 9 provided in the end faces of the tube bodies 1 facing each other.

Furthermore, the circumferential alignment of the front and rear tube bodies 1, 1 is performed by the pin holes 9 and the pins 13, and accurate joining is possible without any misalignment. The small diameter holes 3, 3 can be made to communicate with each other on the same center line with high precision.

In addition, since the opposing end surfaces of the front and rear tubes 1, 1 are connected at their outer peripheries by pins 13, it is possible to eliminate the occurrence of rolling when the tubes are propelled, and the pin 13 has a portion that fits into the pin hole 9 at the tip. Since it is formed into a tapered shape that becomes smaller in diameter toward the pin hole 9, the insertion work into the pin hole 9 can be easily and reliably performed, and the pipe body joining work can be performed smoothly and accurately. They are connected to each other in a bendable manner via the pins 13 without being rigidly connected, and therefore, it is easy to control the direction of movement of the pipe body and to move it in curves, and it is possible to improve workability. .

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a partially omitted vertical cross-sectional side view, FIG. 2 and FIG.
The figures are a longitudinal sectional front view taken along lines A--A and B--B in FIG. DESCRIPTION OF SYMBOLS 1... Pipe main body, 2... Center hole, 3... Small diameter hole, 5... Circumferential section, 6... Collar member, 9... Pin hole, 13... Pin.

Claims (1)

[Scope of utility model registration request] A plurality of small-diameter holes 3 are provided inside the outer periphery between both end faces in parallel to the length direction.A peripheral stepped portion 5 is provided on the outer peripheral surface of one end, and A collar member 6 having a diameter that can be fitted into the circumferential step portion 5 is provided protrudingly, and a pin hole 9 having the same diameter over the entire length is provided on one end surface of the outer peripheral portion of both end surfaces of the tube main body 1. A pin 13 or the pin 1 is drilled to the length of the pin hole 9 on the other end face.
A pin hole 9 having the same shape as the pin hole 9 connectable with the pin hole 9 is provided, and the portion of the pin 13 that fits into the pin hole 9 is formed from a diameter that is approximately equal to the diameter of the pin hole 9 toward the tip to a diameter that gradually becomes smaller. A propulsion tube body characterized by: