JP2661807B2 - Curve propulsion pipe - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a curve propulsion method pipe which is propelled and laid along a curved path in the ground.

2. Description of the Related Art A propulsion method for laying a pipe by propelling it in the ground is generally known. As a pipe used for this propulsion method, a pipe having a pipe joint as shown in FIG. 4 is known. Here, reference numerals 1 and 2 denote a pair of tubes connected to each other, and a receiving port 3 is inserted into an end of one of the tubes 1 and inserted into the receiving port 3 at an end of the other tube 2. Insert 4
Each is formed. An annular groove 6 for accommodating an annular sealing material 5 to be compressed between the inner periphery of the receiving port 3 and the outer periphery of the insertion port 4, and a pipe radial direction at a position deeper than the annular groove 6. And a rear end face 7 of the main body. An exterior concrete 8 is cast on the outer periphery of the pipes 1 and 2, and a cylindrical exterior plate 9 which is flush with the maximum outer diameter portion of the receiving port 3 is provided on the outer periphery of the exterior concrete 8. .

When the pipes 1 and 2 having such a pipe joint are propelled along a curve, bending occurs between the receiving port 3 and the insertion port 4 as shown in the figure. When the pipes 1 and 2 are propelled straight, a large thrust transmitting area can be obtained because the distal end face 10 of the insertion port 4 is in contact with the inner end face 7 with the entire pipe thickness over the entire circumference. When the bend occurs as shown in the figure, only a small portion of the distal end face 10 of the insertion opening 4 inside the curve comes into contact with the rear end face 7, and stress concentration may occur and the thrust transmitting portion may be broken. . Therefore, an object of the present invention is to solve such a problem and to prevent stress concentration in the thrust transmitting portion even when the pipe is propelled along a curve.

In order to achieve the above-mentioned object, according to the present invention, an insertion port at the tip of the other pipe is inserted into a receptacle formed at an end of one pipe, When the end face is in contact with the back end face of the receptacle and the propulsive force from the insertion side is transmitted to the receptacle side, the pipe is propelled along the curved path in the ground and laid, inside the curve The pipe wall of the portion to be formed is formed to be thick and has means for preventing relative rolling between the one pipe and the other pipe.

According to such a configuration, the relative rolling between one tube and the other tube is prevented, so that the thick portion at the back end face of the receiving port of one tube and the other portion are inside the curve. The thick portion on the distal end surface of the insertion opening of the tube comes into contact with the thick portion. Therefore, a relatively large contact area can be obtained, and the occurrence of stress concentration is prevented.

1 to 3 show an embodiment of a pipe for a curve propulsion method according to the present invention. As shown in FIGS. 1 and 2, the tubes 1 and 2 are formed such that a part of the tube wall in the circumferential direction is formed as a thick portion 11, and gradually goes toward the thick portion 11 along the circumferential direction. It is configured as an uneven thickness tube whose thickness increases. As shown in FIG. 1 to FIG.
A rolling prevention mechanism 12 is provided at the joint 2. More specifically, a plate-shaped protruding piece 14 is attached in the pipe axis direction along the outer surface of the insertion port 4 from the end face 13 of the exterior concrete 8 on the side of the insertion port 4 facing the end surface of the receiving port 3.
An appropriate number of the projecting pieces 14 are provided along the circumferential direction of the insertion opening 4. On the other hand, a pair of stopper pieces 15 in the pipe axis direction corresponding to the respective projecting pieces 14 are attached to the end face 16 of the receiving port 3. The stopper piece 15 can pinch the projecting piece 14 from both sides when the insertion opening 4 is inserted into the receiving opening 3. Therefore, the projecting piece 14 and the stopper piece 15 are engaged with each other in the circumferential direction, so that the relative rolling of the two tubes 1 and 2 can be prevented. In such a configuration, when the pipes 1 and 2 are propelled and laid underground, the insertion port 4 is inserted into the receiving port 3 and each protruding piece 14 of the rolling prevention mechanism 12 is connected to the stopper piece 15. Between the two. Tube 1,
When the propeller 2 is propelled straight, the distal end face 10 of the insertion port 4 contacts the back end face 7 of the receiving port 3 over the entire circumference with the entire thickness of the pipe, and the propulsion force is transmitted. The same is true.
When the pipes 1 and 2 are propelled along a curve, the thick portion 11 is located inside the curve. In the road where the pipe is to be laid, the curved portion is known in advance, and the thick portion 11
There is no difficulty in arranging the. At this time, since the relative rolling between the tubes 1 and 2 is prevented by the rolling prevention mechanism 12, the thick portion 11 of the insertion port 4 comes into contact with the thick portion 11 of the receiving port 3 as shown in FIG. As shown in the figure, bending occurs while maintaining the contact state between the thick portions 11. For this reason, the front end face 10 of the insertion port 4 and the reception port 3
Will come in contact with a relatively large area with the back end surface 7 of
The occurrence of stress concentration based on thrust is prevented.

As described above, according to the present invention, the pipe wall at the portion inside the curve of the propulsion pipe is formed thick, and the relative position between one pipe and the other pipe at the joint between the pipes is increased. The thick part at the back end face of the receptacle of one pipe and the thick part at the tip face of the insertion port of the other pipe are in contact with each other inside the curve because As a result, a relatively large contact area can be obtained in the thrust transmitting portion, and the occurrence of stress concentration can be prevented.

[Brief description of the drawings]

FIG. 1 is a sectional view of a joint portion of a pipe for a curve propulsion method according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the insertion opening in FIG.

FIG. 3 is a plan view of the joint section of FIG. 1;

FIG. 4 is a sectional view of a joint portion of a conventional pipe for a propulsion method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pipe 2 Pipe 3 Reception port 4 Insertion port 7 Back end face 10 Tip face 11 Thick part 12 Rolling prevention mechanism

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hirobo Ohama 2-26 Ohama-cho, Amagasaki City, Hyogo Prefecture Inside Kubota Mukogawa Works Co., Ltd.

Claims (1)

(57) [Claims] 1. An insertion port at the tip of the other pipe is inserted into a reception port formed at an end of one of the pipes, and an end face of the insertion port is brought into contact with a rear end face of the reception port so that the insertion port side is formed. By transmitting the propulsive force from the to the receiving port side, it is a pipe that is propelled and laid along the curved path in the ground, and the pipe wall of the part inside the curve is formed thickly And a means for preventing relative rolling between the one pipe and the other pipe.