JP2002310355A - Earthquake proof pipe joint for propulsion construction work with propulsion tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To lay a pipe line having a pipe joint of earthquake proof structure by a method of propulsion construction. SOLUTION: This pipe joint inserts a spigot 2 into a socket 3 by leaving a space S for pressing in of the distance from a spigot tip end 2a to a socket interior end 3a, the pipe joint is provided with a ring unit 9 externally fitted to an outer surface of the spigot 2 to come into contact with a socket opening end and a plurality of pin units 12 inserted in the ring unit 9 in a diametric direction to engage with the outer surface of the spigot 2, and breaking strength of the pin unit 12 is set to the strength enduring against propulsion force of a pipe but breaking for large external force at earthquake.

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 method with a propulsion jig.

[0002]

2. Description of the Related Art There is a so-called earthquake-resistant pipe joint as one type of pipe joint in which a socket formed at an end of the other pipe is inserted into a socket formed at an end of one pipe. .

[0003] This is to prevent the insertion of the socket from the socket and to allow expansion and contraction between the sockets within a certain range. A lock ring is attached to the inner periphery, and a protrusion is formed on the outer periphery of the insertion opening so that the protrusion engages with the lock ring from the back side of the receiving opening. An insertion opening is inserted into and connected to the reception port with a distance between the tip of the mouth and the rear end of the reception port.

[0004] With such a configuration, the insertion port can be inserted into the reception port to a position where the front end portion of the insertion port contacts the rear end portion of the reception port, and the projection of the insertion port locks the reception port. Until the engagement with the ring, the insertion hole can be pulled out of the insertion hole. That is, it has a certain range of space for expansion and contraction.

[0005] By the way, as one type of pipe laying method,
There is a propulsion method. This is, for example, at the first position in the underground pipe laying path, and at the second position at a distance from the first position, respectively, excavating the starting pit and the reaching pit from the ground surface, The pipeline is laid by propelling the pipe underground from the starting pit toward the destination pit. In the pipe for this propulsion method, the propulsion force in the pipe axis direction is transmitted between the receiving port and the insertion port of the pipe joint.

For this reason, as a pipe joint used for a pipe for a propulsion method, for example, a flange is formed on the outer surface of an insertion port, and the insertion port is inserted into the inside of the receiving port, and the flange is brought into contact with the opening end of the receiving port. In some cases, propulsion force can be transmitted between the insertion opening and the reception opening.

[0007]

When a pipeline is laid by the above-mentioned propulsion method, when the laying is completed, all of the plurality of pipe joints in the pipeline laid from the propulsion pit to the destination pit are provided with flanges at the insertion ports. Is in contact with the opening end of the receiving port.

Therefore, in the above-described pipe joint, when the laying is completed, the tip of the insertion port does not contact the back end of the socket, and the projection of the insertion port is not engaged with the lock ring of the socket. In other words, it is not possible to place the insertion projection at a position between the back end of the receiving port and the lock ring, and it is actually impossible to lay the pipe with the above-mentioned pipe joint having the earthquake-resistant structure by the propulsion method. There is a problem that it is impossible.

Accordingly, an object of the present invention is to solve such a problem and to be able to lay a pipeline having a pipe joint having an earthquake-resistant structure by a propulsion method.

[0010]

In a seismic pipe joint for a propulsion method with a protruding jig according to the present invention, an insertion port is inserted into a reception port while leaving a space for pushing between a front end of the insertion port and a rear end of the reception port. A pipe joint, comprising: a ring body externally fitted to the outer surface of the insertion port and in contact with the opening end of the receptacle; and a plurality of pin bodies penetrating the ring body in the radial direction and engaging with the outer surface of the insertion port. Has a breaking strength that can withstand the propulsive force of the pipe but is destroyed by a large external force during an earthquake.

According to this seismic pipe joint for a propulsion method with a propulsion jig, the thrust transmitted from the insertion port to the receiving port is strong enough to withstand the thrust of the pipe but to be destroyed by a large external force during an earthquake. The thrust transmission function of this pin allows the propulsion method with the pushing space to be provided, but when an extraordinary external force such as an earthquake is applied after laying, the external force As a result, the pin body is broken, and as a result, the insertion port can be moved into the receiving port by the length of the space for pushing.

[0012]

Next, an embodiment of a seismic pipe joint for a propulsion method with a propulsion jig according to the present invention will be described.

Embodiment 1 FIG. 1 is a sectional view of an essential part of a seismic pipe joint for a propulsion method with a propulsion jig according to Embodiment 1 of the present invention.

In FIG. 1, reference numeral 2 denotes an insertion port, which forms one end of a pipe 1a used in the propulsion method and is inserted into a receiving port 3 formed at the other end of another pipe 1b. Between the outer surface of the insertion opening 2 and the inner surface of the receiving opening 3, a sealing rubber ring 4 is provided.
a lock ring 6 which engages with a protrusion 2b formed on the outer periphery of the distal end 2a of the insertion hole 2 to prevent the lock ring 6 from slipping out of the rubber ring 4 for sealing. It is stored in the groove 5b.

The insertion port 2 is inserted into the receiving port 3 at a depth substantially at an intermediate position, and a pressing space S is provided between the insertion tip 2a and the receiving port end 3a. Reference numeral 9 denotes a split receiving-side ring body, which is externally fitted to the outer surface of the insertion port 2, one end of which is in contact with the opening 3 b of the receiving port, and which has a diameter that allows the opening to open to the outer surface of the insertion port 2. I have.

The inner surface of the receiving side ring body 10 has a tapered surface 9a whose diameter increases in a direction away from the receiving opening end 3b.
It has been. In addition, the receiving-side ring body 10 is provided with screw holes (not shown) on opposite surfaces of the split portion because the directions of the screw threads are reversed, and the screw threads on both sides are provided in the female screw holes. The inverted bolt 9c is screwed in, and the nut 9d provided in the middle of the bolt 9c is tightened to forcibly reduce the diameter of the receiving-side ring body 9 which can be opened.

The bolt 9c has a weaker breaking strength, and has a strength to withstand the propulsive force of the pipe but to be destroyed by a large external force during an earthquake, similarly to the pin body 12 described later. On the outer surface of the insertion port 2, an insertion-side ring body 10, which has a tapered surface 10 a in contact with the inner surface of the reception-side ring body 9 on the outer surface and is tightly fitted to the insertion port 2, is provided on the inner surface. The formed claw piece 10b is attached so as to engage with the outer surface of the insertion opening.

The insertion-side ring body 9 and the insertion-side ring body 10 are connected to each other when the reception-side ring body 9 is brought into contact with the insertion-side ring body 10 without any gap. Through holes 11 ... 11 are formed radially along the radial axis of 2,
Pin bodies 12... 12 are inserted into the through holes 11.

The breaking strength of the pin body 12 is such that it can withstand the propulsive force of the pipe but is destroyed by a large external force during an earthquake. Specifically, the insertion port 2 is inserted into the receiving port 3. The two ring bodies 9, 10 contacting each other at the tapered surfaces 9a, 10a
12 are inserted so as to be common to the above, and thrust is transmitted from the insertion port 2 to the receiving port 3 via the pin body 12.

Next, the operation of the seismic pipe joint for the propulsion method with the propulsion jig according to the first embodiment will be described. First, FIG.
As shown in FIG. 1, the insertion-side ring body 10 and the reception-side ring body 9 are externally fitted to the outer surface of the insertion port 2 in a tentative state, and as shown in FIG. Gap S for pushing
Is left, the receiving-side ring body 9 is positioned on the outer surface of the insertion port 2 where the receiving opening end 3b is located, and then the tapered surface 10a of the insertion-side ring body 10 is changed to the tapered surface of the receiving-side ring body 9. Then, as shown in FIG. 3, the nut 9d of the tightening bolt 9c is tightened with a tool such as a wrench to reduce the diameter of the receiving-side ring body 9 as shown in FIG. If the diameters of the through holes 11...
2... 12 are inserted to connect them via the pin body 12.

At this time, the claw pieces 10b on the inner surface of the insertion-side ring body 10 are also pressed against the outer surface of the insertion port by the tightening force of the receiving-side ring body 9, so that they bite into the outer surface of the insertion port 2.
As described above, the receiving-side ring body 9 which is made open by inserting the pin body 12 into the through holes 11... Is reduced in diameter to the inserting-side ring body 10 and the two are integrated. Is done.

Next, when an axial driving force is applied to the insertion port 2, the driving force is transmitted from the insertion-side ring 9, which is applied to the outer surface of the insertion port 2 by the claw 9b, in addition to the contact friction with the tapered surfaces 9a and 10a. It is transmitted to the receiving-side ring body 9 and the receiving port 3 through the body 12. Further, since the breaking strength of the pin body 12 and the bolts 9c, 9c is set to a strength that can withstand the propulsion force, the pin body 12 and the bolts 9c, 9c are not broken by a force of about the propulsion force.
The pipe is propelled even if the space S for pushing exists between the pipes.

After a pipe is laid, when a large external force during an earthquake is applied and a compressive force acts in the axial direction of the pipe, as shown in FIG. The side ring body 9 moves in a direction to ride on the insertion side ring body 10, and a shear force acts on the pin body 12.

Since the breaking strength of the pin body 12 is set to a strength that cannot withstand this external force, the pin body 12 is sheared and broken. Due to this break, the receiving-side ring body 9 attempts to expand its diameter, and at the same time rides on the tapered surface of the insertion-side ring body 10 so as to further forcibly expand its diameter. As a result, the bolt 9c is also broken, as shown in FIG. As described above, the receiving-side ring body 9 expands in diameter and separates from the outer periphery of the insertion-side ring body 10.

Therefore, the insertion-side ring 10 is released from the contraction force caused by the pressure contact of the tapered surface of the reception-side ring body 9. For this reason, the engaging force of the claw 10b is also weakened. As a result, the insertion-side ring 9 slides on the outer surface of the insertion opening 2 and allows the insertion opening 2 to move toward the back of the insertion opening by the distance of the gap S.

When a force is applied in the pull-out direction,
As shown in FIG. 5, since the receiving-side ring 10 is merely in contact with the receiving side, the movement in the pulling-out direction is allowed until the insertion projection 2 a contacts the lock ring 5.

As described above, according to the seismic pipe joint for the propulsion method with the propulsion jig, the pipe can be laid at the joint part of the propulsion pipe with a margin for movement in the reduction direction. Further, since the ring bodies 9 and 10 for providing the pushing space S are attached to the outer surface of the pipe 1, there is no problem even if the pipes are left as they are after laying. Second Embodiment FIG. 6 is a sectional view of a seismic pipe joint for a propulsion method with a propulsion jig according to a second embodiment.

In the second embodiment, since only the shape of the ring body of the first embodiment is different, the same portions are denoted by the same reference numerals, and only the different portions will be described instead of detailed description.

In FIG. 6, on the outer surface of the insertion port 2, there is provided a short cylindrical receiving-side ring member 15 having an inner diameter larger than the outer shape of the insertion port 2 and having a diameter such that one end thereof can contact the receiving opening end 3a. An insertion-side ring body 16 having an outer diameter smaller than the inner diameter of the reception-side ring body 15 is welded to the outer surface of the insertion-hole, and partially overlaps the reception-side ring body 15 in the axial direction. It is arranged in the state to be.

Further, through holes 17 radially communicating with both of the receiving side ring body 15 and the insertion side ring body 16 are provided at appropriate intervals in the circumferential direction, and a plurality of pin bodies 12 are provided. The pin body 12 is inserted through the through hole 17 and
Thereby, both ring bodies 15 and 16 are connected in the axial direction.

As in the first embodiment, the breaking strength of this pin is set to a value that can withstand the propulsive force of the pipe but is broken by a large external force during an earthquake. When connecting the propulsion pipe with the seismic pipe joint for the propulsion method with the propulsion jig according to the second embodiment, first, the insertion-side ring body 16 is fixed at a fixed distance from the pipe end on the outer surface of the insertion port by welding or the like. The pin-side ring body 15 is fitted to the outside of the housing, and the pin body 12 is inserted into the common through-hole 17 so that the two are not moved in the axial direction.

In this state, the insertion port 2 is inserted into the reception port 3, and the insertion port 2 is inserted into the reception-side ring body 15 until the opening end 3 b of the reception port 3 comes into contact. After that, a propulsion force is applied to propel the propulsion tube into the sheath tube.

At this time, since the breaking strength of the pin body 12 is set to be strong enough to withstand the propulsive force, even if the pushing space S exists between the insertion end 2a and the receiving end 3a, the pipe 12 is not crushed. Will be promoted.

After the pipe is laid, when a large external force during an earthquake is applied and a compressive force acts in the pipe axis direction, the insertion port 2 attempts to enter the reception port 3, and the reception side ring body 15 is inserted by the force. Try to move so as to overlap on the side ring body 16,
A shear force acts on the pin body 12.

Since the breaking strength of the pin body 12 is such that it cannot withstand this external force, the pin body 12 is sheared and broken. As a result, as shown in FIG. It moves to the outer surface of the mouth side ring body 16 and allows the insertion opening 2 to move for a distance of the gap S.

When a force is applied in the pull-out direction,
Since the receiving-side ring 16 is merely in contact with the receiving side, the movement in the pull-out direction is allowed until the insertion projection 2a contacts the lock ring 5, as shown in FIG.

Third Embodiment FIG. 9 is a sectional view of a seismic pipe joint for a propulsion method with a propulsion jig according to a third embodiment. The third embodiment differs from the second embodiment only in the configuration of the ring body of the second embodiment.
The same parts as those described above are denoted by the same reference numerals and description thereof will be omitted.

In the third embodiment, the receiving-side ring body 15 is directly connected to the outer surface of the insertion port 2 by the pin body 12. That is, as shown in FIG. 10, the pin body 12 is provided upright on the inner surface of the receiving-side ring body 15 in the radial direction.
As shown in FIG. 10, the receiving-side ring body 15 is split into two parts. The receiving-side ring body 15 is externally fitted to the outer surface of the insertion port 2 inserted into the receiving port 3 by a predetermined amount, and fastened with a bolt nut 19. ing.

Further, in order to increase the engaging force with respect to the outer surface of the insertion port 2, the pin body 12 is to be brought into contact with the outer surface of the insertion port 2 in a posture as close as possible to the axis 19a of the bolt nut 19 as shown in the figure. Will be arranged.

In order to connect the propulsion pipe by the propulsion method seismic pipe joint with the propulsion jig of the third embodiment,
Is inserted into the receptacle 3 so as to leave a distance S between the insertion tip 2a and the receptacle end 3a, and in this state, the reception-side ring body split into two on the outer surface of the receptacle 2 Then, the bolt nut 19 is tightened and strongly tightened so that the tip of the pin body 12 bites into the outer surface of the insertion opening.

After this state, a propulsion force is applied to propel the propulsion tube into the sheath tube. At this time, the propulsive force is transmitted to the receiving opening end 3b via the pin body 12 and the receiving side ring body 15 that bite into the outer surface of the insertion port 2, and the breaking strength of the pin body can withstand the propulsive force in the sheath tube. Because of the strength, the pipe is propelled even if the pushing space S exists between the insertion end 2a and the reception end 3a.

After the pipe is laid, when a large external force during an earthquake is applied and a compressive force acts in the pipe axis direction, the receiving side ring body 15 is opened by the force of the insertion port 2 entering the receiving port 3. The pin 3 is pushed by the end 3 b to move in the direction of the insertion opening 2, and a bending force acts on the pin body 12. Since the breaking strength of the pin body 12 is set to a strength that cannot withstand this external force, the pin body 12 is bent and broken, and as a result, as shown in FIG. To allow movement for a distance corresponding to the gap S.

When a force is applied in the pull-out direction,
Since the receiving-side ring 16 is merely in contact with the receiving side, movement in the pulling-out direction is allowed until the insertion projection comes into contact with the lock ring as shown in FIG.

[0044]

As described above, according to the seismic pipe joint for the propulsion method with the propulsion jig of the present invention, when the pipe is to be propelled, the tip of the insertion port and the back end of the receiving port are irrespective of the propulsion method. A space for earthquake resistance can be provided between them and propulsion can be made.

[Brief description of the drawings]

FIG. 1 is a sectional view of a seismic pipe joint for a propulsion method with a propulsion jig according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a state before connection of a seismic pipe joint for a propulsion method with a propulsion jig according to the first embodiment of the present invention.

FIG. 3 is an enlarged sectional view taken on line XX of FIG. 1;

FIG. 4 is a cross-sectional view showing a state in which a seismic function is exhibited when the insertion hole is pushed into the reception opening.

FIG. 5 is a cross-sectional view showing a state in which a seismic function is exhibited when the insertion hole comes out of the reception opening.

FIG. 6 is a sectional view of a seismic pipe joint for a propulsion method with a propulsion jig according to a second embodiment.

FIG. 7 is a cross-sectional view showing a state in which the seismic function is exhibited when the insertion hole is pushed into the reception opening.

FIG. 8 is a cross-sectional view illustrating a state in which the seismic function is exhibited when the insertion hole comes out of the reception port.

FIG. 9 is a cross-sectional view of a seismic pipe joint for a propulsion method with a propulsion jig according to a third embodiment.

FIG. 10 is a front view of a receiving-side ring body.

FIG. 11 is a cross-sectional view showing a state in which a seismic function is exhibited when the insertion hole is pushed into the reception opening.

FIG. 12 is a cross-sectional view showing a state in which the seismic resistance function is exhibited when the insertion exits from the reception opening.

[Explanation of symbols]

 1a Insertion side pipe 1b Reception side pipe 2 Insertion port 3 Reception port 4 Sealing rubber ring 5a Centering rubber 5b Lock ring storage groove 6 Lock ring 9 Reception side ring body 10 Insertion side ring body 12 Pin body 15 Reception Mouth side ring body 16 Insertion side ring body

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2D054 AC18 AD28 3H015 FA01 3H104 JA02 JB02 KA04 KC03 KC06 LF02 LF05 LG03 LG22

Claims (1)

[Claims] Claims: 1. In a pipe joint in which an insertion hole is inserted into a reception port while leaving a space for pushing between a front end of the insertion port and a rear end of the reception port, a ring body which is externally fitted to an outer surface of the insertion port and in contact with an opening end of the reception port. And a plurality of pins that penetrate the ring body in the radial direction and engage with the outer surface of the insertion opening. The breaking strength of the pins can withstand the propulsive force of the pipe, but can withstand a large external force during an earthquake. Is a seismic pipe joint for a propulsion method with a propulsion jig that has a strength to be destroyed.