JPH10148289A - Earthquake resistant pipe joint for propelling pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an extension/contraction margin in the side of advancing-in of a pipe joint for a propelling pipe when an earthquake occurs. SOLUTION: In the inside of a socket 13 formed in an end part of one pipe 11 connected to each other, a spigot 14 formed in an end part of the other pipe 12 is inserted, between a tip end face of the spigot 14 and a depth end face 18 of the socket 13, propelling force is transmitted. Between the tip end face of the spigot 14 and the depth end face 18 of the socket 13, a liner 30 capable of transmitting propelling force between the socket/spigot is provided. The liner 30 has a main unit part constituted by a plural quantity along the peripheral direction and a cylinder device mounted over the fellow adjacent main unit parts. The liner 30, diametrically contracted by contracting action of the cylinder device, can be removed into the pipe from between the tip end face of the spigot 14 and the depth end face 18 of the socket 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seismic pipe joint for a propulsion pipe.

[0002]

2. Description of the Related Art As one type of pipe joint, a socket formed at an end of another pipe is inserted into a socket formed at an end of one pipe to be joined to each other, and a socket is formed. 2. Description of the Related Art There is known a so-called pipe joint for a propulsion pipe, which can be propelled and laid underground by transmitting a propulsion force between the pipes.

FIG. 3 illustrates a conventional pipe joint for a propulsion pipe of this type, which is applied to, for example, a ductile cast iron pipe having a medium diameter of 600 mm or less. That is, the following propulsion pipe 3 is inserted inside the receiving port 2 of the preceding propulsion pipe 1.
The propulsion force 5 acts on the succeeding propulsion pipe 3, and the rear end face 6 of the receiving port 2 is pushed by the front end face 7 of the insertion port 4, so that the two propulsion pipes 1 and 3 are grounded. The propulsion is performed inside, and new propulsion pipes are sequentially added to the rear. An annular rubber sealing member 8 between the inner periphery of the receptacle 2 and the outer periphery of the insertion opening 4
Are arranged in a compressed state, so that a required sealing function is provided between the receptacle insertion openings. Further, a concrete exterior 9 having a diameter corresponding to the receiving port 2 is formed on the outer periphery of the propulsion pipes 1 and 3 so as to reduce resistance during propulsion.

[0004]

However, in such a conventional configuration, when an earthquake occurs, the two pipes 1 and 3 are freely displaced to the exit side, but the distal end surface 7 of the insertion port 4 is closed. Since it is propelled and laid in contact with the rear end face of No. 2, there is a problem that it cannot be displaced to the entrance side and an excessive force is easily applied.

Accordingly, an object of the present invention is to solve such a problem and to provide a joint for a propulsion pipe with an allowance for expansion and contraction to the entry side when an earthquake occurs.

[0006]

SUMMARY OF THE INVENTION In order to achieve this object, the present invention is directed to a spigot formed at the end of one of the tubes joined to the end of the other tube. Is inserted, and a propulsion force can be transmitted between the distal end face of the insertion port and the rear end face of the receiving port. A liner capable of transmitting propulsive force is provided between the mouth insertion holes, the liner has a plurality of main bodies arranged in a circumferential direction, and a cylinder device provided between adjacent main bodies. The diameter of the cylinder is reduced by the shortening operation of the cylinder device so that the cylinder can be detached into the pipe from between the distal end face of the insertion port and the rear end face of the receptacle.

With such a configuration, during propulsion, it is possible to transmit the propulsion force between the receiving port and the insertion port via the liner. After the propulsion is completed, the liner is reduced in diameter by the shortening operation of the cylinder device, and the liner is removed from the space between the distal end surface of the insertion port and the rear end surface of the receiving port into the pipe. A certain distance is kept between the back end face. Therefore, if a force is applied between the socket and the mouth during the occurrence of an earthquake, the insertion of the socket into the back of the socket within this distance is allowed. A situation such as breakage due to an excessive force acting between the inner end surface of the first member and the second member is prevented.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, reference numerals 11 and 12 denote a pair of propulsion tubes which are joined to each other. At the end of the propulsion pipe 12 to be propelled, an insertion port 14 inserted into the inside of the receiving port 13 is formed. A tapered sealing material pressing surface 15 is formed on the inner periphery of the opening of the receiving port 13, and an annular groove is formed on the inner circumference of the receiving port 13 further deeper than the sealing material pressing surface 15. 16, an inner peripheral surface 17 having a diameter smaller than that of the annular groove 16, and a rear end surface 18 in the pipe radial direction are formed in this order.

An annular rubber sealing member 20 is provided between the sealing member pressing surface 15 and the outer peripheral surface of the insertion opening 14. An annular split ring 21 and an annular pressing wheel 2 engaged with the split ring 21 are provided around the outer periphery of the insertion port 14 outside the receiving port 13.
2 is fitted. Then, a plurality of bolts 23 in the pipe direction in the circumferential direction implanted at the end of the receiving port 13 and a nut 24 screwed to the bolt 23 are used.
By pressing the sealing material 20 through the pressing ring 22 and the split ring 21, the sealing material 20 is compressed between the sealing material pressing surface 15 and the outer peripheral surface of the insertion opening 14, and a required space is formed between the receiving opening and the insertion opening. Is provided.

[0010] An annular backup ring 25 is provided between the socket openings on the back side of the socket 13 with respect to the sealing material 20.
By engaging with the lock ring 26 fitted in the seal 6, it plays a role of backing up the sealing material 20. The lock ring 26 is formed so as to be tightly tightened in the circumferential direction so as to fit into the annular groove 16 as described above so as to be fastened to the outer periphery of the insertion opening 14 at that portion. . An annular projection 27 that can engage with the lock ring 26 from the back side of the receiving port 13 is formed integrally with the outer periphery of the distal end of the insertion port 14.

An annular liner 30 is provided between the distal end surface 28 of the insertion opening 14 and the rear end surface 18 of the receiving opening 13. As shown in FIG. 2, the liner 30 includes a metal body 31 having a rectangular cross section and formed in a plurality in the circumferential direction.
In order to connect the main body portions 31 adjacent in the circumferential direction to each other, the main body portion 31 is constituted by a cylinder device 32 provided between the main body portions 31. FIG.
2A shows a state where the diameter of the liner 30 is expanded by extending all the cylinder devices 32, and FIG.
0 indicates a state in which the diameter is reduced. This liner 32 is shown in FIG.
When the diameter is increased as shown in FIG. 1A, it is interposed between the distal end face 28 of the insertion port 14 and the rear end face 18 of the receptacle 13 as shown by a solid line in FIG. When the diameter is reduced as shown in FIG. 2B, the diameter becomes smaller than the inner diameter of the pipes 11 and 12 as shown by the phantom line in FIG. It can be removed from between the rear end face 18 and the inside of the pipes 11 and 12.

As shown in FIG. 1, the liner 30 is
When it is sandwiched between the front end surface 28 of the socket 13 and the rear end surface 18 of the socket 13, a certain distance A is formed between the projection 27 of the insertion opening 14 and the lock ring 26 housed in the annular groove 16. ing.

On the outer circumference of the propulsion tubes 11 and 13, a concrete outer case 35 is formed with an outer diameter slightly larger than the maximum diameter portion 36 of the receiving port 13, thereby reducing the resistance during propulsion. I have. An outer periphery of a maximum diameter portion 36 of the receiving port 13,
The exterior 35 is not formed at the portion where the bolt 23, the nut 24, the pressing ring 22, etc. are arranged in the insertion opening 14, and a metal annular cover 37 is provided instead. The cover 37 integrally has a cylindrical main body 38 in the pipe axis direction and an inner flange 39, and one end and the other end thereof are configured to be in contact with the outer casing 35 of the pipes 11 and 12, respectively. I have. The main body 38 is configured to cover the bolt 23, the nut 24, the press ring 22, and the like, and the maximum diameter portion 36 of the receiving port 13, and is configured such that the outer diameter thereof is equal to the outer diameter of the exterior 35. . The inner flange portion 39 is configured such that a side surface thereof is in contact with an end surface of the exterior 35 of the tube 12 on the insertion port 14 side, and is configured such that an inner peripheral surface thereof is in contact with an outer peripheral surface of the insertion port 14.

In such a configuration, when the pipeline is laid by the propulsion method, the receiving port 13 of the preceding propulsion pipe 11 is used.
The inner diameter of the liner 30 is increased beforehand inside
Set the lock ring 26 in the reduced
3 and set in the annular groove 16. The push ring 22, the split ring 21, the sealing material 20, and the backup ring 25 are fitted in the insertion port 4 of the following propulsion pipe 12 in advance. In this state, when the insertion port 14 is inserted into the receptacle 13, the protrusion 27 at the tip of the insertion port 14 pushes and spreads the lock ring 26, and enters the depth side of the receptacle 13. Then, the sealing material 20 is compressed by the pressing ring 22 and the split ring 21 by fastening the bolt 23 and the nut 24.

As a result, the connection between the receiving port 13 and the insertion port 14 is completed, so that the cover 37 is attached to the joint to apply a propulsive force to the subsequent pipe 12. Then, most of the propulsion force is transmitted from the distal end surface 28 of the insertion port 14 to the deep end surface 18 of the receiving port 13 via the main body 31 of the liner 30. A part of the propulsion force is transmitted from the outer casing 35 of the subsequent propulsion pipe 12 to the outer casing of the preceding propulsion pipe 11 via the cover 37, so that no load is applied to the bolt 23 during propulsion. In this way, the tubes 11, 12
Is propelled underground and buried in place. At this time, since the joint portion is covered with the cover 37, it is possible to prevent stones and soil from entering the installation portion of the bolt 23 during propulsion and causing deformation.

When the propulsion is completed, the liner 30 is sandwiched between the front end surface 28 of the insertion opening 14 and the rear end surface 18 of the receiving opening 13 as shown by a solid line in FIG.
A distance A is maintained between the protrusion 27 of the lock ring 26 and the protrusion 27. Therefore, all the cylinder devices 32 are shortened to reduce the diameter of the liner 30, and the liner 30 is connected to the distal end surface 28 of the insertion port 14 and the receiving port 1 as shown by a virtual line in FIG.
3 and is removed from the inside of the tubes 11 and 12 from between the inner end surface 18 and the tube 3 and removed. Then, a liner 30 is provided between the distal end surface 28 of the insertion opening 14 and the rear end surface 18 of the receiving opening 13.
The distance B corresponding to the width of the main body 31 is maintained.

When an exiting force acts between the receiving openings when an earthquake occurs, the distance A is within a range until the projection 27 of the opening 14 engages with the lock ring 26.
The escape allowance is secured in the range until the is clogged. In this case, the engagement between the protruding portion 27 and the lock ring 26 prevents the detachment between the receiving opening and the insertion opening.
Assuming that the diameters of the apertures 1 and 12 are D, a large separation prevention force of 0.3 D [tf] or more can be obtained. In addition, when a force is applied between the inlet and outlet when an earthquake occurs,
The entry allowance is ensured in a range until the front end surface 28 of the No. 4 hits the rear end surface 18 of the receptacle 13, that is, in a range until the distance B is narrowed. Therefore, the distal end surface 28 of the insertion port 14
It is possible to prevent the occurrence of a situation such as breakage due to excessive force acting between the inner end surface 18 and the inner end surface 18 of the receiving port 13.

[0018]

As described above, according to the present invention, a liner capable of transmitting propulsive force between the receiving port and the receiving port is provided between the distal end face of the receiving port and the rear end face of the receiving port. It has a plurality of main body portions along the circumferential direction, and a cylinder device extended between adjacent main body portions. And the back end face of the receiving port so that it can be removed into the pipe, during propulsion, thrust can be transmitted between the receiving port insertion through the liner, and after propulsion, By reducing the diameter of the liner by the shortening operation of the cylinder device and removing it from the space between the distal end surface of the insertion port and the rear end surface of the socket, the liner is removed Can be formed at a certain distance, so that when an earthquake occurs, When this is applied, the insertion of the insertion port into the back side of the socket can be allowed within this range, and excessive force acts between the front end face of the insertion port and the rear end face of the socket. It is possible to prevent a situation such as breakage from occurring.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of a seismic pipe joint for a propulsion pipe according to an embodiment of the present invention.

FIG. 2 is a side view of the liner in FIG.

FIG. 3 is a sectional view of an example of a conventional joint for a propulsion pipe.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Propulsion pipe 12 Propulsion pipe 13 Reception port 14 Insertion port 18 Back end face 28 End face 30 Liner 31 Main body part 32 Cylinder device

Claims (1)

[Claims] An insertion port formed at an end of another pipe is inserted into a reception port formed at an end of one pipe joined to each other, and a distal end surface of the insertion port and a depth of the reception port are inserted. A pipe joint configured to be capable of transmitting propulsive force to and from an end face, wherein the liner is capable of transmitting propulsive force between a receiving port and a front end face of the insertion port and a rear end face of the receiving port. The liner has a plurality of main bodies arranged in a circumferential direction, and a cylinder device provided between adjacent main body portions, and is reduced in diameter by a shortening operation of the cylinder device. A seismic pipe joint for a propulsion pipe characterized in that it is configured to be removable into the pipe from between the distal end face of the insertion port and the rear end face of the receptacle.