JP2001141151A - Jacking pipe with earthquake-resistant function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To install an earthquake resistant pipe having a joint part of a socket and a spigot with the earthquake resistant function underground by a pipe jacking method. SOLUTION: An earthquake resistant structure with the detachment preventive function and the expansion function is provided between the socket 12 and the spigot 14. A flange 25 is formed on an outer surface of the spigot 14 outside the socket 12, and a jacking force transmission member 28 is provided between the flange 25 and an end portion of the socket 12. The jacking force transmission member 28 can transmit the jacking force in installing the pipeline between the socket 12 and the spigot 14, and when a large force is applied between the socket 12 and the spigot 14, the jacking force transmission member is broken by this force, and the spigot 14 is allowed to enter more inward of the socket 12 on the distal side than a case where the spigot 14 transmits the jacking force.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a propulsion pipe having an earthquake-resistant function.

[0002]

2. Description of the Related Art There is known a propulsion method in which a pipe is laid by propelling a pipe underground. The propulsion pipes used in this propulsion method have insertion ports formed at the ends of the other pipes inserted into the reception ports formed at the ends of one of the pipes to be joined to each other. Propulsion force is transmitted to and from the insertion opening. This thrust is transmitted with the insert fully inserted into the receptacle,
Therefore, when the installation of the pipeline is completed, the insertion port can no longer enter the inside of the receiving port.

On the other hand, there is known an earthquake-resistant tube provided with a separation preventing function and a telescopic function between a receiving port and an insertion port. In this seismic pipe, when an earthquake occurs after the pipeline is laid, the expansion and contraction to allow the insertion port to slip out of the reception port or enter the reception port within a certain range due to the seismic force, It is formed in the joint part of the opening and the opening. In other words, for seismic pipes, when the installation of the pipeline is completed,
The spout must not be completely inserted into the spout.

[0004] For this reason, in an earthquake-resistant pipe, it is not possible to lay a pipeline in the ground by a propulsion method, and it is common to bury the pipe using an open-cutting method.

[0005]

However, when a pipeline is to be laid under a river or a track, it is difficult to adopt a conventional open-cutting method. In the case where a pipe is buried under a road, there is a problem in that the use of the open-cutting method may impede traffic, such as the need to restrict traffic.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve such a problem and to make it possible to lay a seismic pipe having a seismic function at the joint between a receiving port and a port underground by a propulsion method. I do.

[0007]

According to the present invention, there is provided an earthquake-resistant structure having a detachment preventing function and a telescopic function provided between a receiving port and an insertion port. A flange is formed on the outer surface of the insertion port outside the opening, and a thrust transmitting member is provided between the flange and an end of the receiving port. It is configured to be able to transmit the propulsion force at the time of laying the road, and is damaged when a large force acts between the receiving port and the insertion port. Is made to be allowed to enter the inside.

[0008] According to such a configuration, the thrust transmitting member is disposed between the flange and the end of the socket in a state where the expansion and contraction is provided between the socket and the insertion port, and the insertion of the reception port is performed. By transmitting the propulsion force between the mouths, the pipeline is laid underground by the propulsion method. For this reason, even when the installation of the pipeline is completed, the above-described expansion and contraction is ensured, and the insertion port can escape from the reception port in a certain range or enter the reception port due to damage of the thrust transmitting member. . Therefore, an earthquake-resistant pipe having a joint between the receiving port and the insertion port having an earthquake-resistant structure is laid underground by the propulsion method.

According to the present invention, the thrust transmitting member is formed in the form of a cylindrical body fitted over the flange to the receiving port, and the inner peripheral portion of the cylindrical body is formed between the flange and the end of the receiving port. By being formed as a small-diameter portion disposed between the small-diameter portions, a step portion is formed at an end portion of the small-diameter portion. The stepped part is sheared and broken when a large force acts between the socket and the insertion port, allowing the insertion port to enter the inside of the socket to the far side than when transmitting the propulsion force It is preferable to set

Further, according to the present invention, the thrust transmitting member is
A cylindrical cover that is fitted over the flange to the port, and a propulsion that transmits the propulsive force when laying the pipeline by being disposed between the flange and the end of the port on the inner peripheral side of the cover. The thrust transmitting body has a force transmitting body, and the thrust transmitting body is crushed when a large force acts between the receiving opening and the insertion opening, so that the insertion opening receives the propulsion force to a farther side than when the thrust is transmitted. It is preferred that the entry into the mouth is made acceptable.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, a socket 12 is formed at the end of one cast iron pipe 11 to be joined to each other.
At the end of the other cast iron pipe 13, an insertion opening 14 to be inserted into the inside of the receiving opening 12 is formed. An annular rubber sealing material 17 is provided in the sealing material accommodation groove 16 on the inner periphery of the receiving port 12.
Is arranged. A lock ring housing groove 18 is formed on the inner periphery of the receiving port 12 on the back side of the seal material housing groove 16,
A metal lock ring 19 that is split in the circumferential direction is mounted in the housing groove 18. Between the outer periphery of the lock ring 19 and the inner periphery of the housing groove 18, a holding rubber ring 20 for holding the lock ring 19 in a state of being centered with respect to the receiving port 12 is arranged. Reference numeral 21 denotes a rear end surface of the receiving port 12, which is formed at a position at a predetermined distance from the lock ring 19 accommodated in the accommodation groove 18.

On the outer periphery of the distal end of the insertion port 14, a projection 22 which can be engaged with the lock ring 19 from the back side of the reception port 12.
Are formed. A tapered surface 23 serving as a guide when inserting the insertion port 14 into the receiving port 12 in which the sealing material 17 and the lock ring 19 are accommodated is formed on the outer periphery of the distal end of the insertion port 14 including the protrusion 22. Have been. The protrusion 22 is formed such that the dimension in the tube axis direction is smaller than the distance from the lock ring 19 to the inner end surface 21. Accordingly, the insertion port 14 is relatively movable in the tube axis direction with respect to the receiving port 12 within a range until the protrusion 22 hits the lock ring 19 or the rear end face 21.

Tubes 11 and 13 excluding receiving port 12 and insertion port 14
The exterior concrete 24 is cast on the outer periphery of.
This exterior concrete 24 is cast for the purpose of reducing the propulsion resistance when laying a pipeline, and its outer diameter is
2 is formed so as to correspond to the maximum outside diameter. Socket 1
A metal flange 25 having a rectangular cross section is formed on the outer periphery of the insertion opening 14 outside the opening 4, that is, at a portion not entering the receiving opening 14. This flange 25
It is formed of a metal material and is fixed to the insertion opening 14 by welding or the like. This flange 25 can function as a formwork when the exterior concrete 24 is cast. Reference numeral 26 denotes a metal rib provided in an appropriate number along the circumferential direction on the outer surface of the insertion port 14.
This flange 25 and the flange 25 can receive a force acting on the flange 25 from the tip side of the flange 25.
It is buried in the exterior concrete 24 in a state of being extended between the outer surface of the insertion port 14 and a position farther from the receiving port 12.

Reference numeral 28 denotes a propulsion force transmitting member, which is formed in the form of a metal tubular body fitted over the flange 25 to the end of the receptacle 12. The portion between the flange 25 and the receiving port 12 in the inner peripheral portion of the cylindrical propulsion force transmitting member 28 is formed as a small-diameter portion 29 protruding radially inward. Step portions 30, 30 are formed on the inner periphery of the propulsion force transmitting member 28 at both ends of the small diameter portion 29, respectively. The small diameter portion 29 is arranged so as to be sandwiched between the flange 25 and the end of the receiving port 12 via the step portions 30 and 30.

In such a configuration, when joining the tubes 11 and 13, the rubber ring 20 and the lock ring 19 and the sealing material 17 are first mounted inside the receiving port 12 of the tube 11, The insertion port 14 into which the driving force transmission member 28 has been fitted in advance is inserted into the port 12. Then
The projecting portion 22 at the tip of the insertion opening 14 is used by the sealing member 17, the lock ring 19 and the rubber
To spread the seal material 17 and the lock ring 1.
9 and is located at an intermediate portion between the lock ring 19 and the rear end face 21 along the pipe axis direction as shown in FIG.

At this time, one end of the propulsion force transmitting member 28 is fitted to the flange 25 and the other end is fitted to the end of the socket 12, and as shown in FIG. 25 and the other step 30 is engaged with the receptacle 12. When laying a pipe, the pipes 11 and 13 in this state are propelled underground. In this case, for example, when transmitting the propulsion force from the insertion port 14 to the reception port 12, the propulsion force is transmitted to the propulsion force transmission member 28 in the form of a shearing force acting on the one step 30 from the flange 25. The receiving port 1 is formed in the form of a shearing force from the other step 30 of the thrust transmitting member 28.
2 is transmitted. That is, in the state shown in FIG.
13 is propelled and the pipeline is laid in the state shown in FIG. At this time, the propulsion force transmitting member 26 also functions as a cover that covers a portion between the flange 25 and the receiving port 12 and that prevents earth and sand from entering this portion.

The behavior when a force in the pipe axis direction acts on the joint portion at the time of occurrence of an earthquake or the like is as follows. When a force acts in a direction in which the insertion port 14 enters the reception port 12 and the force is not so large, this force is applied between the reception port 12 and the insertion port 14 as in the case of the above-described thrust. And expansion and contraction do not occur between them as in the case of FIG. On the other hand, when a large force is applied, the small diameter portion 29 of the propulsion force transmitting member 28 is sheared and broken at the step 30 as shown in FIG. Numeral 31 is the shear fracture portion.

Then, as shown in the figure, since the shear breaking portion 31 is inclined, the flange 25 and the receiving port 12 enter the inside of the small diameter portion 29 as shown in FIG. As a result, the flange 25 and the receiving port 12 can slide in the tube axis direction along the inner surface of the small diameter portion 29 as shown in the drawing, and enter the receiving port 12 until the insertion port 12 hits the rear end face 21. be able to.

At this time, the thrust transmitting member 28 is deformed in the radially expanding direction. In addition, the propulsion force transmitting member 28 can be constituted by an annular body continuous in the circumferential direction, is divided into an appropriate number along the circumferential direction, and the divided portion is fastened by a fastening member such as a bolt. Alternatively, the structure may be such that when a large force is applied, the diameter of the fastening member can be increased by breaking. In the case of such a divided structure, the insertion port 14 is
Is inserted to complete the joining of the joint portion, the propulsion force transmitting member 28 can be mounted over the flange 25 and the end of the socket 12.

When a force acts in a direction in which the insertion opening 14 comes out of the reception opening 12, the movement of the pipes 11, 13 is not restricted by the propulsion transmission member 26, and the flange 25 receives the movement as shown in FIG. Move away from mouth 12. Finally, the projection 22 of the insertion opening 14 engages with the lock ring 19,
The insertion of the insertion port 14 from the receiving port 12 is reliably prevented.

In this manner, the function of expanding and contracting the joint portion and the function of preventing detachment at the time of occurrence of an earthquake are ensured, and the performance as an earthquake-resistant joint is obtained. 5 to 7 show another embodiment of the present invention. Here, as the thrust transmitting member 28, a metal cylindrical cover 33 fitted from the flange 25 to the socket 12 and a thrust transmitting body 34 provided on the inner peripheral side of the cover 33. It is configured. The propulsion transmission body 34 is formed of wood, resin, or the like,
It is attached to the inner surface of the cover by bonding or the like, and is disposed so as to be sandwiched between the flange 25 and the end of the receptacle 12. It is preferable that a plurality of the thrust transmitting members 34 are arranged along the circumferential direction of the thrust transmitting member 34, but they may be formed in an annular shape like the cover 33.

In such a configuration, when laying a pipe, the pipes 11 and 13 in the state shown in FIG. 5 are propelled underground. In this case, for example, when transmitting the propulsion force from the insertion port 14 to the reception port 12, the propulsion force is transmitted from the flange 25 to the reception port 12 via the propulsion force transmission member 34. That is, in the state shown in FIG.
1, 13 are propelled, and the pipeline is laid in the state shown in FIG.

The behavior when a force in the pipe axis direction acts on the joint portion at the time of occurrence of an earthquake or the like is as follows. When a force acts in a direction in which the insertion port 14 enters the receiving port 12 and the force is not so large, this force is transmitted through the insertion force transmission member 34 through the thrust transmitting member 34 as in the case of the above-described propulsion. It is transmitted between 14 and the receptacle 12, and no expansion and contraction occur between them. On the other hand, when a large force acts, the force acting at that time breaks the propulsion force transmitting body 34 as shown in FIG. Can get inside.

In the state shown in FIG. 5, when a force acts in a direction in which the insertion port 14 comes out of the
The movements of 1 and 13 are not restricted by the propulsion force transmitting member 28, and the flange 25 moves away from the receiving port 12 as shown in FIG. Finally, the protrusion 22 of the insertion port 14 engages with the lock ring 19, and the insertion of the insertion port 14 from the receiving port 12 is reliably prevented.

[0025]

As described above, according to the present invention, a seismic structure having a function of preventing detachment and a function of expansion and contraction is provided between the socket and the insertion port, and the insertion port outside the reception port is provided. A flange is formed on the outer surface of the vehicle, and a thrust transmitting member is provided between the flange and an end of the receiving port. It is configured to be able to transmit force, and is damaged when a large force acts between the receiving port and the insertion port, and the insertion port enters the inside of the receiving port deeper than when transmitting the propulsion force The propulsion force transmitting member is arranged between the flange and the end of the socket with the expansion and contraction provided between the socket and the socket. By transmitting the propulsion force between the mouths, the pipeline can be laid underground by the propulsion method. For this reason, even when the installation of the pipeline is completed, the above-described expansion and contraction is ensured, and the insertion port can escape from the reception port in a certain range or enter the reception port due to damage of the thrust transmitting member. . Therefore, it is possible to lay a seismic pipe in which the joint between the receiving port and the insertion port has an earthquake-resistant structure underground by the propulsion method.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a configuration of a joint portion of a propulsion pipe having an earthquake-resistant function according to an embodiment of the present invention.

FIG. 2 is an enlarged view showing a state where the propulsion force transmitting member shown in FIG. 1 has undergone shear fracture.

FIG. 3 is a diagram showing a state when a force in a pushing direction acts on the joint portion of FIG. 1;

FIG. 4 is a view showing a state when a force in a pull-out direction acts on the joint part of FIG. 1;

FIG. 5 is a sectional view showing a configuration of a joint portion of a propulsion pipe having an earthquake-resistant function according to another embodiment of the present invention.

FIG. 6 is a view showing a state when a force in a pushing direction acts on the joint portion of FIG. 5;

FIG. 7 is a diagram showing a state when a force in a pull-out direction acts on the joint portion of FIG. 5;

[Explanation of symbols]

 12 Receiving port 14 Insertion port 25 Flange 28 Thrust transmitting member 29 Small diameter part 30 Step part 34 Thrust transmitting body

Claims (3)

[Claims] 1. An insertion port formed at an end of another pipe is inserted into a reception port formed at an end of one of the pipes to be joined to each other, and between the reception port and the insertion port. A propulsion tube configured to transmit a propulsion force at the receiving port, and configured to have an earthquake-resistant structure provided with a separation preventing function and a telescopic function between the receiving port and the insertion port; A flange is formed on the outer surface of the insertion port outside the opening, and a thrust transmitting member is provided between the flange and an end of the receiving port. It is configured to be able to transmit the propulsion force at the time of laying the road, and is damaged when a large force acts between the receiving port and the insertion port. A propulsion pipe having an earthquake-resistant function, characterized in that it is allowed to enter the interior of the vehicle. 2. The thrust transmitting member is formed in the form of a tubular body fitted over the flange to the receiving port, and an inner peripheral portion of the tubular body is provided between the flange and an end of the receiving port. By being formed as a small-diameter portion to be arranged, a step portion is formed at an end of the small-diameter portion. Can be allowed to penetrate into the interior of the receptacle to a greater depth than when transmitting propulsion by shearing and breaking when a large force acts between the receptacle and the receptacle. The propulsion pipe having an earthquake-resistant function according to claim 1, wherein: 3. The thrust transmitting member is disposed between the flange and the end of the receiving port on the inner peripheral side of the cover, the cylindrical cover being fitted over the receiving port from the flange. A propulsion force transmitting body for transmitting the propulsion force at the time of laying the pipeline, and the propulsion force transmitting body collapses when a large force acts between the receiving port and the insertion port, so that the insertion port is The propulsion pipe having an anti-seismic function according to claim 1, wherein the propulsion pipe is allowed to enter the interior of the receiving port to a deeper side than when transmitting the propulsion force.