JPH04119887U - Structure of pipe joint for curve propulsion method - Google Patents

Abstract

(57) [Summary] [Purpose] Even when the pipe for the propulsion method is propelled along a curve, it is possible to load sufficient propulsive force by preventing stress concentration from occurring in the propulsive force transmission section. do. [Structure] The tip surface 10 of the socket 4 contacts the back end surface 7 of the socket 3, and the propulsive force from the socket side is transmitted to the socket side, causing propulsion along a curved path underground. It will be done. A plurality of pieces 11 that are in contact with both the inner end surface 7 and the distal end surface 10 and whose length in the tube axis direction can be adjusted are arranged over the entire circumference between the inner end surface 7 and the distal end surface 10. [Effect] Even if bending occurs between the socket and socket during curve propulsion, by adjusting the length of each piece 11 in the tube axis direction, each piece 11 can be aligned with the inner end surface 7 and the tip over the entire circumference. Face 10
come into contact with. Therefore, the area for transmitting the propulsive force becomes sufficient, and a sufficient propulsive force can be applied.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to the structure of a pipe joint for curve propulsion construction method.

0002

[Conventional technology]

A propulsion method in which a pipe is propelled underground and laid is generally known. This propulsion A pipe with a pipe joint as shown in Figure 4 is known as a pipe used in the method. There is. Here, 1 and 2 are a pair of pipes that are connected to each other, and the end of one pipe 1 is is a socket 3, and at the other end of the tube 2 is a socket 4 inserted into the socket 3. each formed. The inner circumference of the socket 3 should be compressed between the outer circumference of the socket 4. An annular groove 6 for accommodating an annular sealing material 5 and a position further back than this annular groove 6 A inner end surface 7 in the tube radial direction is formed. There is an exterior condenser on the outer periphery of pipes 1 and 2. A cleat 8 is cast, and the outermost part of the socket 3 is placed on the outer periphery of the exterior concrete 8. A cylindrical exterior plate 9 flush with the large outer diameter portion is provided.

0003

[Problem that the idea aims to solve]

When the pipes 1 and 2 having pipe joints with such a configuration are propelled along a curve, the figure As shown, a bend occurs between the socket 3 and the socket 4. Push these tubes 1 and 2 straight. When advancing, make sure that the distal end surface 10 of the insertion port 4 is in contact with the inner end surface 7 over the entire circumference and the entire pipe thickness. Because of this, it is possible to obtain a large propulsion force transmission area from the socket 4 side to the socket 3 side. Wear. However, if a bend occurs as shown in the diagram, the insertion hole on the inside of the curve Only a small portion of the tip end surface 10 of 4 will come into contact with the back end surface 7, causing stress concentration. There is that. Therefore, it is possible to apply a smaller propulsive force than when propulsion is straight. There is a problem that it cannot be used.

0004 Therefore, the present invention solves these problems and allows the pipe to be propelled along a curve. Even if the The purpose is to make it possible to load.

[0005]

[Means to solve the problem]

In order to achieve the above object, the present invention has a socket formed at the end of one pipe. The socket at the tip of the other tube is inserted, and the tip surface of this socket contacts the back end surface of the socket. By transmitting the propulsive force from the inlet side to the inlet side, a curved path underground is created. In a pipe joint for a pipe that is propelled along a road and laid, the tip surface of the insertion port and the socket A piece that is in contact with both the inner end surface and whose length in the tube axis direction can be adjusted. , a plurality of these are arranged around the entire circumference between the tip surface of the socket and the back end surface of the socket. It is.

[0006]

[Effect]

According to such a configuration, the socket and the insertion point can be connected by propelling it along the curved path. A bend occurs between the socket and the socket, and the distance between the tip end surface of the socket and the back end surface of the socket changes in the circumferential direction. Even if the length of each piece in the tube axis direction is adjusted, each piece can be By bringing the base into contact with the tip end surface of the socket and the back end surface of the socket, the area for propulsion transmission is sufficient. It will be worth it. This eliminates the risk of stress concentration and provides sufficient propulsion force. It becomes possible to load the

[0007]

【Example】

As shown in FIG. 11 are provided. As shown in FIG. 3, this piece 11 has a plurality of pieces with gaps in the circumferential direction. They are lined up closely and arranged in a ring.

[0008] As shown in FIG. 2, each piece 11 includes a pair of sector-shaped contact pieces 12 and 13, and It has a screw 14 that connects the pieces 12 and 13. The contact piece 12 is connected to the back end surface 7 of the socket 1. It has an arcuate notch 16 that comes into contact with the inner surface edge 15 of the tube following this rear end surface 7. . Similarly, the contact piece 13 connects the distal end surface 10 of the socket 4 and the inner surface edge 17 of the tube following this distal end surface 10. It has an arc-shaped notch 18 that comes into contact with. Screw 14 is screwed into each contact piece 12, 13 It has a pair of male threaded parts 19 and 20 at both ends, and these male threaded parts 19 and 20 are connected to each other. Consists of reverse threads. Therefore, when screw 14 is rotated in a certain direction, the contact piece 12 and 13 are moved closer to each other, and when screw 14 is rotated in the opposite direction, they are brought into contact. Pieces 12 and 13 are moved away from each other.

[0009] When moving the tubes 1 and 2 along a curve, connect them to the socket 3 as shown in Figure 4. A bend occurs between the opening 4 and the distance between the rear end surface 7 and the front end surface 10 changes along the circumferential direction. Ru. Therefore, adjust the screws 14 of each piece 11, and Depending on the distance between surface 7 and tip surface 10, move both contact pieces 12 and 13 closer together or farther apart. or

0010 By doing this, the contact pieces 12 of all the pieces 11 can be brought into contact with the rear end surface 7. At the same time, the contact piece 13 can be brought into contact with the tip surface 10. For this reason, insert The transmission area of the propulsive force from the mouth 4 side to the socket 3 side can be increased, reducing stress. By eliminating the risk of concentration, it is possible to load sufficient propulsive force. Become.

[0011] After the propulsion is completed, remove all pieces 11 and create a joint between the rear end surface 7 and the front end surface 10. Fill it up.

0012

[Effect of the idea]

As described above, according to the present invention, both the front end surface of the socket and the back end surface of the socket are in contact with each other. At the same time, insert a piece whose length in the tube axis direction can be adjusted at the tip of these sockets. Multiple units are placed around the entire circumference between the surface and the back end of the socket, making it possible to create a curved path. By pushing along the socket, a bend occurs between the socket and the socket, and the tip surface of the socket and the socket Even if the distance from the inner end surface changes in the circumferential direction, the length of each piece in the tube axis direction Adjust so that each piece is in contact with the tip of the socket and the back end of the socket all around. By doing so, the area for transmitting the propulsion force can be made sufficient, thereby reducing stress concentration. can be prevented from occurring, and sufficient propulsive force can be applied.

[Brief explanation of drawings]

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

FIG. 2 is a three-view diagram of the piece in FIG. 1;

FIG. 3 is a diagram showing the arrangement of pieces.

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

[Explanation of symbols]

1 tube 2 pipes 3 Socket 4 Socket 7 Back end surface 10 Tip surface 11 pieces 12 Contact piece 13 Contact piece 14 screws

──────────────────────────────────────────────── ─── Continuation of front page (72) Creator Hiroyasu Ohama 2-26 Ohamacho, Amagasaki City, Hyogo Prefecture, Ltd. Inside Kubota Mukogawa Factory

Claims (1)

[Scope of utility model registration request] Claim 1: The socket at the tip of the other pipe is inserted into the socket formed at the end of the other pipe, and the distal end surface of the socket is brought into contact with the back end surface of the socket. A structure of a pipe joint for a pipe that is propelled along a curved path underground by transmitting propulsion force from the side to the socket side,
A piece that is in contact with both the distal end surface of the socket and the rear end surface of the socket and whose length in the tube axis direction can be adjusted is placed between the distal end surface of the socket and the rear end surface of the socket. A structure of a pipe joint for the curve propulsion method, which is characterized by a plurality of pipe joints arranged around the circumference.