JPH0712793Y2 - Seismic Propulsion Pipe Joint Structure - Google Patents

Description

TECHNICAL FIELD The present invention relates to a pipe for laying a power cable or a communication cable, and more particularly to an earthquake-resistant propulsion pipe laid by a propulsion method.

2. Description of the Related Art Conventionally, when a power cable, a communication cable, or the like is laid in the ground, a pipeline is buried in the ground in advance, and the pipeline is laid by being inserted into the buried pipeline. In addition, the pipeline was buried in the ground by the propulsion method.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the above-mentioned pipeline, a structure for expanding and contracting and preventing separation is required for the joint portion in order to cope with an earthquake or the like, and conductivity and airtightness are required.

The present invention solves the above problems, and an object of the present invention is to provide a joint structure of a seismic propulsion pipe that has conductivity and airtightness, and can expand and contract and prevent separation.

Means for Solving the Problems In order to solve the above-mentioned problems, the joint structure of the seismic propulsion pipe of the present invention is such that the insertion end of one pipe abuts the inner end of the reception end of the other pipe. And place it in the socket of the other tube,
A rubber material is placed between the inner peripheral surface of the receiving opening and the outer peripheral surface of the insertion opening so as to be in close contact with both peripheral surfaces. Are provided at a plurality of positions along the pipe circumferential direction, and an annular groove is formed on the inner peripheral surface of the receiving opening, and an annular engaging groove having an appropriate width in the pipe axial direction is formed on the outer peripheral surface of the insertion opening. A structure in which a lock ring whose diameter can be freely reduced is held in the groove by hugging it in an annular engagement groove on the outer peripheral surface of the insertion slot, and set bolts for urging the lock ring in the radial direction to reduce the diameter are provided at multiple points in the receiving opening. It is what

Operation The operation in the above configuration will be described below. The force that propels the pipe at the time of laying is transmitted from the rear end of the receiving end of the other pipe to the tip of the insertion end of the one pipe. Further, when the pull-out force acts on both pipes in the installed state, the lock ring is pushed by the set bolt and moves in the annular engagement groove in the annular engagement groove while being held in the annular engagement groove. The pipe is allowed to move in and out within the width of the annular engaging groove, and the annular engaging groove is locked to the side wall surface of the annular engaging groove on the rear end side of the receiving port to prevent both the tubes from coming out. During this time, the rubber ring and the conductive material are in close contact with the inner peripheral surface of the receiving opening and the outer peripheral surface of the insertion opening, so that the airtightness and conductivity of the joint portion are always maintained.

Embodiment An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, the seismic propulsion pipes 1 and 2 are provided with an exterior concrete 4 covering the peripheral surface of the cast iron pipe 3 and an exterior steel plate 5 covering the exterior concrete 4. Further, a receiving port 6 is formed at one end of the seismic propulsion pipes 1 and 2, and an insertion port 7 is formed at the other end.

The seismic propulsion pipes 1 and 2 are connected by inserting the insertion opening 7 of the seismic propulsion pipe 1 on one side into the receiving opening 6 of the seismic propulsion pipe 2 on the other side. The tip 7a of the insertion opening 1 is in contact with the receiving end 6a of the other seismic propulsion tube 2. Further, between the outer peripheral surface 7b of the seismic propulsion pipe 1 on one side and the inner peripheral surface 6b of the receiving port on the other seismic propulsion tube 2, both peripheral surfaces 7b, 6b are provided.
A rubber ring 8 that is in close contact with the rubber ring 8 is interposed, and the rubber ring 8 is arranged in a first annular groove 9 formed on the inner peripheral surface 6b of the receiving port. Further, the conductive material 10 is provided at a plurality of positions along the pipe circumferential direction so as to embrace the rubber ring 8, and the conductive material 10 is in contact with the inner peripheral surface 6b of the receiving opening and the outer peripheral surface 7b of the insertion opening.

Then, a second annular groove 11 is formed on the inner peripheral surface 6b of the receiving port so as to be located closer to the receiving opening than the first annular groove 9 is.
Inside the 11 is arranged a lock ring 12 which can be freely reduced in diameter. The lock ring 12 is provided so as to be held in an annular engagement groove 13 formed on the outer peripheral surface 7b of the insertion opening.
The annular engagement groove 13 has an appropriate width in the axial direction of the tube. Further, set bolts 14 are provided at the receiving port 6 at a plurality of positions along the pipe circumferential direction so as to extend and retract in the pipe radial direction to reduce the diameter of the lock ring 12.

The operation of the above configuration will be described below. At the time of laying, with the insertion port 7 inserted in the receiving port 6, the other earthquake-resistant propulsion pipe 1 from the receiving port inner end 6a of the other earthquake-resistant propulsion pipe 2
The propelling force is transmitted to the tip 7a of the insertion opening.

Then, in the laid state, when the withdrawal force acts on both of the seismic propulsion pipes 1 and 2, the lock ring 12 is pressed by the set bolt 14 and held in the annular engagement groove 13 so as to move in the annular engagement groove 13. The seismic propulsion pipes for both sides are moved in the axial direction of the pipe.
The withdrawal of both seismic propulsion tubes 1 and 2 is allowed while allowing the withdrawal of 1 and 2 within the width of the annular engaging groove 13 and being locked to the side wall surface of the annular engaging groove 13 on the rear end side of the receiving port. Prevent. During this time, the rubber ring 8 and the conductive material 10 are brought into close contact with the receiving opening inner peripheral surface 6b and the insertion opening outer peripheral surface 7b, so that the airtightness and conductivity of the joint portion are always maintained.

Effect of the Invention According to the present invention as described above, the lock ring moves in the annular engagement groove, so that both pipes can be retracted and retracted within the width of the annular engagement groove. Is locked to the side wall surface on the rear end side of the receiving end of the annular engaging groove, it is possible to prevent both tubes from coming out. Further, since the rubber ring and the conductive material come into close contact with the inner peripheral surface of the receiving opening and the outer peripheral surface of the insertion opening when both of them come in and out, the airtightness and the electrical conductivity of the joint portion can always be maintained.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing a joint structure of a seismic propulsion pipe showing an embodiment of the present invention. 1, 2 ... Seismic propulsion pipe, 6 ... Receiving port, 7 ... Inserting port, 8 ... Rubber ring, 10 ... Conductive material, 12 ... Lock ring, 13 ... Annular engagement groove,
14 ... Set bolt.

Claims (1)

[Scope of utility model registration request] 1. An insertion opening of one tube is inserted and arranged in a receiving opening of the other tube so that a tip of the opening comes into contact with a receiving end of the other tube.
A rubber material is placed between the inner peripheral surface of the receiving opening and the outer peripheral surface of the insertion opening so as to be in close contact with both peripheral surfaces. Are provided at a plurality of positions along the pipe circumferential direction, and an annular groove is formed on the inner peripheral surface of the receiving opening, and an annular engaging groove having an appropriate width in the pipe axial direction is formed on the outer peripheral surface of the insertion opening. A lock ring whose diameter can be freely reduced is provided in the groove by hugging it in an annular engagement groove on the outer peripheral surface of the insertion slot, and set bolts that urge the lock ring in the radial direction to reduce the diameter are provided at multiple points on the receptacle. The structure of the joint section of the seismic propulsion pipe.