JPH10148288A - 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 28 of the spigot 14 and a depth end face 18 of the socket 13, propelling force is transmitted. Between the tip end face 28 of the spigot 14 and the depth end face 18 of the socket 13, propelling force can be transmitted between the socket and the spigot, also an elastic liner 30 is interposed, which can permit advancing-in of the spigot 14 toward a depth side 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. 4 illustrates a conventional pipe joint for a propulsion pipe of this type, which is applied to, for example, a medium-diameter ductile cast iron pipe having a 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 tip 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. An elastic liner capable of transmitting a propulsive force between the mouth insertion holes and allowing the insertion of the insertion mouth toward the back side of the receiving opening is interposed.

[0007] With this configuration, during propulsion, it is possible to transmit a propulsive force between the receiving port and the receiving port through the elastic liner. When an earthquake occurs after the end of propulsion and a force is applied between the socket openings, the elastic liner elastically deforms and allows the insertion to enter the interior of the socket, so the front end of the insertion port The occurrence of a situation such as breakage due to excessive force acting between the inner end surface and the inner end surface of the receptacle 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 elastic 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 FIGS. 1 to 3, the elastic liner 30
It is composed of a main body 31 made of a plurality of hard rubbers having a rectangular cross section formed in the circumferential direction and a thin connecting rubber 32 for connecting mutually adjacent main bodies 31 in the circumferential direction. The inner diameter of the elastic liner 30 is
The inner diameter of the pipe 12 is adjusted so as not to cause resistance of the fluid flowing in the pipe. A plurality of compression springs 33 made of metal are embedded in each main body 31 in the circumferential direction.
Each compression spring 33 is constituted by, for example, a coil spring as shown in the figure, and is compressible in the tube axis direction. In addition, as shown in detail in FIG.
A metal backup plate 34 for backing up both ends of the compression spring 33 can be embedded as needed.

As shown in FIG. 1, when the elastic liner 30 is sandwiched between the distal end surface 28 of the insertion opening 14 and the rear end surface 18 of the receiving opening 13, the projection 27 of the insertion opening 14 and the annular groove 16 A fixed distance A is formed between the lock ring 26 and the lock ring 26.

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 elastic liner 30 is set in advance inside the inner peripheral surface 17 and the lock ring 26 is inserted into the receiving port 13 in a reduced diameter state and set in the annular groove 16. A push ring 22, a split ring 21, and a sealing material 20 are inserted into the insertion port 4 of the subsequent propulsion pipe 12.
And the backup ring 25 are fitted in advance. When the insertion port 14 is inserted into the receptacle 13 in this state, the projection 27 at the tip of the insertion port 14
And spread it further into the interior 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 opening 14 to the deep end surface 18 of the receiving opening 13 via the elastic liner 30. Part of the propulsion 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,
Thus, no load is applied to the bolt 23 during propulsion. In this way, the pipes 11, 12 are propelled underground and buried at predetermined positions. 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.

At the time when the propulsion is completed, as shown in FIG.
And the projection 2 of the insertion opening 14
A distance A is maintained between the lock ring 7 and the lock ring 26.

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 penetration force acts between the receiving port and the receiving port when an earthquake occurs, the compression allowance at that time is ensured by compressing and deforming the elastic liner 30. Therefore, it is possible to prevent occurrence of a situation in which an excessive force acts between the distal end surface 28 of the insertion opening 14 and the rear end surface 18 of the receiving opening 13 to cause breakage.

[0018]

As described above, according to the present invention, it is possible to transmit the propulsive force between the front end of the insertion port and the rear end face of the reception port between the reception port insertion ports and to the back side of the reception port. An elastic liner that allows the entrance of the insertion port toward it is interposed, so that during propulsion, thrust can be transmitted between the receiving port insertion port via this elastic liner, and when an earthquake occurs after the end of propulsion However, if a force is applied between the socket openings and the force is applied, the elastic liner is elastically deformed to allow the insertion of the socket to the back side of the socket, so that the front end face of the socket and the back end face of the socket are In such a case, it is possible to prevent the occurrence of a situation such as breakage due to an excessive force acting between them.

[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 an enlarged cross-sectional view of the liner of FIG. 2;

FIG. 4 is a sectional view of an example of a conventional pipe 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

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 a propulsive force between the end surface and a front end surface of the insertion port and a rear end surface of the reception port, and capable of transmitting the propulsion force between the reception port openings. A seismic pipe joint for propulsion pipes, which is provided with an elastic liner that allows insertion of the insertion port toward the back of the receiving port.