JP2003214087A - Antiseismic pipe joint for jacking method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To lay a pipe passage having a pipe joint with an antiseismic structure by a jacking method. <P>SOLUTION: The antiseismic pipe joint is composed so that jacking force upon laying the passage is transmitted between one pipe having a socket 13 in an end part and another pipe having a spigot 14 in an end part to be inserted in an interior of the socket 13 in a separation prevented state. In an outer side of the socket 13, an inclined face 37 is formed on an exterior of the spigot 14, and a tube axial direction jacking force transmitting member 43 is attached to the socket 13. The jacking force transmitting member 43 is composed so that its tip contacts the inclined face 37, and it transmits the jacking force between the spigot 14 and the socket 13 upon laying the passage. When force larger than the jacking force acts between the spigot 14 and the socket 13, the jacking force transmitting member 43 deforms by action of the inclined face corresponding to the force, and it can allow further penetration of the spigot 14 into the socket 13. <P>COPYRIGHT: (C)2003,JPO

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seismic pipe joint for a propulsion method. 2. Description of the Related Art A so-called seismic pipe joint is a type of pipe joint in which a socket formed at an end of another pipe is inserted into a socket formed at an end of one pipe. is there. This seismic pipe joint prevents the insertion of the insertion port from the receiving port and allows expansion and contraction between the receiving port insertion ports within a certain range. As such a seismic pipe joint, for example, a lock ring is attached to the inner periphery of the socket, and a projection is formed on the outer periphery of the insertion port so that the projection engages with the lock ring from the back side of the socket. In some cases, the receptacle is inserted into the receptacle at a distance between the lock ring and the projection, and between the distal end of the receptacle and the inner end of the receptacle. [0003] With such a configuration, the insertion port can be inserted into the reception port up 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 it engages with the ring, it is possible to get out of the insertion opening from the receiving opening. That is, the joint can be expanded and contracted within a certain range. [0004] By the way, as one type of pipe laying method,
There is a propulsion method. In this method, a pipeline is laid by, for example, propelling a new pipe into a sheath pipe laid in advance in the ground or an existing aging pipe. [0005] In this pipe for a propulsion method, a propulsive force in the pipe axis direction is transmitted between the receiving ports 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 an outer surface of an insertion port, and an insertion port is inserted into a receiving port and the flange is brought into contact with a receiving port opening end. In some cases, the driving force can be transmitted between the insertion opening and the receiving opening. However, when the 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 start pit to the destination pit are laid. However, it is inevitable that the flange of the insertion hole comes into contact with the opening end of the reception opening. Therefore, after the laying is completed, it is not possible for the insertion opening to enter a further state toward the back side of the reception opening. For this reason, there is a problem that it is practically impossible to lay a pipe having the above-mentioned pipe joint having a telescopic earthquake-resistant structure by a propulsion method. Accordingly, an object of the present invention is to solve such a problem and to make it possible to lay a pipeline having a pipe joint having an earthquake-resistant structure by a propulsion method. [0008] In order to achieve this object, the present invention provides a tube having one end having an opening and an insertion opening at the end, wherein the insertion opening is provided at the receiving end. A propulsion method seismic pipe coupling configured to transmit the propulsion force when laying a pipeline between the other pipe inserted in a state where the pipe is prevented from being detached, and an insertion port outside the receiving port An inclined surface is formed on the outside, and a thrust transmitting member in the pipe axis direction is attached to the receiving port, and this thrust transmitting member is configured such that a tip portion thereof is in contact with the inclined surface, and when the pipeline is laid, It is configured to be able to transmit the propulsion force between the insertion opening and the receiving opening, and when a force larger than the propulsion force acts between the insertion opening and the receiving opening, the driving force is based on the force. It can be deformed by the action of the inclined surface to allow further insertion of the insertion port into the receptacle. It is configured as follows. With such a configuration, when the pipeline is laid, the tip of the thrust transmitting member in the axial direction of the pipe mounted on the receiving port is provided with an inclined surface formed outside the receiving port and outside the insertion port. In the state in which the propulsion force is transmitted between the receiving port and the receiving port. At the time of the occurrence of an earthquake, when a force acts in a direction in which the insertion opening comes out of the receiving opening, the propulsion force transmitting member and the inclined surface are only in contact with each other, and are separated from each other,
Thereby, the seismic function of the pipe joint is exhibited. Conversely, when a force acts in a direction in which the insertion port enters the receiving port during an earthquake, if the force is not so large, the force is applied between the receiving port insertion port by the inclined surface and the thrust transmitting member. It is only transmitted to When the force is increased, the thrust transmitting member is deformed by the wedge action of the inclined surface formed outside the insertion port, and further insertion of the insertion port into the receiving port is allowed, and thereby, a predetermined The seismic function will be exhibited. FIG. 2 and FIG. 3 show a sheath tube 10 which is buried in advance in the ground. 11
Is a conduit laid by the propulsion method inside the sheath tube 10, and has a configuration in which a plurality of ductile cast iron tubes 12 are joined to each other. As shown in FIGS. 1 to 3, one end of one of the tubes 12, 12 joined to each other is provided with a socket 13 at the end thereof.
Are formed, and the other end has a socket 1
3 is formed with an insertion port 14 inserted therein. Tube 1
Lining layers 15 and 15 are formed on the inner periphery of 2 and 12, respectively. On the inner periphery of the receiving port 13, a tapered sealing material pressing surface 16, a lock ring housing groove 17, and an inner peripheral surface 18 are formed in this order from the opening end side. 19
Is the back end face of the receptacle. The press-contact surface 16 of the receiving port 13 and the insertion port 1
An annular rubber seal member 20 is disposed between the outer peripheral surface of the housing 4 and the lock ring 21 in the housing groove 17. A backup ring 22 is provided between the seal member 20 and the lock ring 21. The lock ring 21 is divided in the circumferential direction and is housed in the housing groove 17 while being fastened to the outer periphery of the insertion opening 14. An annular protrusion 23 is formed on the outer periphery of the distal end of the insertion port 14 on the back side of the receiving port 13 with respect to the lock ring 21. It is possible to engage with. The receiving port 13 has a plurality of bolts 24 in the circumferential direction.
Is screwed in the tube axis direction from an end face 25 of the receiving port 13, and the other end of the bolt 24 is attached to a pressing ring 26 fitted to the insertion port 14 at a portion outside the receiving port 13. Has been passed. Then, by screwing a nut 27 to the bolt 24, the pressing contact surface 16 of the receiving port 13 is passed through the pressing ring 26 and the split ring 28 provided on the inner peripheral side of the pressing ring 26.
The seal member 20 is configured to be able to be compressed between the seal member 20 and the outer peripheral surface of the insertion opening 14. By compressing the sealing material 20 in this manner, the receiving port 13 and the insertion port 14 are separated from each other by the lock ring 21 and the annular projection 23 being spaced apart in the tube axis direction.
Are joined to each other such that the distal end surface 29 and the rear end surface 19 of the receptacle 13 are spaced apart in the tube axis direction. In the state where the receiving port 13 and the insertion port 14 are joined to each other, an annular thrust transmission band is provided at a position of the insertion port 14 at a position away from the receiving port 13 in the tube axis direction. 31 is fixed in an externally fitted state. For details,
In the thrust transmitting band 31, a cylindrical band body 32 is divided into two parts in a circumferential direction, and a divided part 33 along the circumferential direction is fastened by a bolt and a nut 34, so that an insertion hole is formed. 14 is fixed to the outer periphery. In this fixed state, in order to prevent the thrust transmission band 31 from sliding along the outer surface of the insertion port 14, particularly in the pipe axis direction,
It is preferable that a band-shaped rubber plate or the like is interposed between the inner periphery of the band main body 32 and the outer periphery of the insertion opening 14. Band body 32
At a plurality of positions along the circumferential direction on the outer surface of the
A caster 35 that can roll the inner surface of the band 0 along the pipe axis direction is attached by welding or the like in a state of rising from the band main body 32. In addition, the band body 3
In other plural positions along the circumferential direction on the outer surface of No. 2,
The first thrust transmission plate 36 is attached by welding or the like in a state of standing radially so that the plate thickness direction is the circumferential direction of the insertion opening 14. In the first thrust transmission plate 36,
An inclined surface 37 is formed so as to be closer to the central axis of the insertion opening 14 as the position approaches the receiving opening 13. An annular thrust transmitting flange 38 is mounted on the end face 25 of the receiving port 13. As shown in FIGS. 1 to 4, the thrust transmitting flange 38 includes a flange main body 39 formed of an annular plate, and the flange main body 39 is provided in each bolt 24 in the radial direction of the pipe 12. Semicircular notch recess 40 which engages the outer half circumference along
Is formed so as to be fitted concentrically with the socket at the pitch circle formed by the plurality of bolts 24. In this state, the flange body 39 is connected to the socket 13.
Can be in contact with the end face 25. At a plurality of positions along the circumferential direction on the thrust transmitting flange 38, the first
Are provided. Each first rib 4
1 is such that one end thereof is fixed to the flange main body 39 by welding or the like, and when the flange main body 39 contacts the end face 25 of the receptacle 13, the other end contacts the outer peripheral surface 42 of the end of the receptacle 13. Is configured. Further, the thrust transmitting flange 38 is provided with a second thrust transmitting plate 43 in the pipe axis direction as a thrust transmitting member at a plurality of positions along the circumferential direction. The thrust transmitting plate 43 is arranged so that its thickness direction is in the radial direction of the pipe 12, its base end is fixed to the flange main body 39 by welding or the like, and its tip end is the first thrust. It is configured to be in contact with the transmission plate 36. An inclined surface 44 that can contact the inclined surface 37 of the first thrust transmitting plate 36 is formed at the tip of the second thrust transmitting plate 43. At a position outside the second thrust transmission plate 43 along the radial direction of the pipe 12,
A second rib 45 is provided. This second rib 45
The second thrust transmitting plate 43 has one end thereof welded or the like.
And the other end is fixed to the flange body 39 by welding or the like. In such a configuration, when the receiving port 13 and the insertion port 14 of the tubes 12 are joined to each other, first,
The press ring 26, the split ring 28, the seal member 20, the backup ring 22, and the thrust transmitting flange 38 are fitted in the insertion opening 14 in advance. On the other hand, the lock ring 21 is accommodated in the accommodation groove 17 of the receiving port 13, and the diameter of the lock ring 21 is enlarged by a jig so that the annular projection 23 of the insertion port 14 can pass through the inside. Then, in this state, the insertion port 14 is inserted into the receiving port 13, and the annular projection 23 at the tip of the insertion port passes through the lock ring 21, and the annular projection 23 is formed between the lock ring 21 and the receiving port 13. The insertion of the lock ring is stopped in a state where the lock ring is located at an intermediate position with respect to the rear end face 19, the diameter of the lock ring is expanded by the jig, and the outer periphery of the insertion opening 14 is tightened by its elastic force. Thereafter, the flange main body 39 of the thrust transmitting flange 38 is arranged on the outer peripheral side of the bolt 24 and is brought into contact with the end surface 25 of the receiving port 13, and the backup ring 22 and the sealing material 20 are inserted into the receiving port 13 and the receiving port 13. 1
4, the split ring 28 is brought into contact with the end face of the sealing material 20, and the bolts 24 are arranged so as to pass through the pressing ring 26 while the pressing ring 26 is engaged with the split ring 28. Is screwed to the bolt 24 and fastened. In this state, the joining between the receiving port 13 and the insertion port 14 is completed. Next, the thrust transmitting band 31 is connected to the receiving port 13.
Of the first thrust transmitting plate 36 is in contact with the inclined surface 44 of the second thrust transmitting plate 43, and the flange body 39 of the thrust transmitting flange 38. Is in contact with the end face 25 of the socket 13 and the thrust transmitting band 31 is
4 fixed to the outer periphery. When laying a conduit by the pipes 12, 12,... Inside the sheath pipe 10, the receptacle 13 and the insertion port are joined to each other and the thrust transmission band 31 is attached as described above. The completed pipe joint is propelled inside the sheath tube 10. At this time, for example, from the insertion port 14 to the reception port 13
When the thrust is transmitted to the
4 to the thrust transmission band 31, the inclined surface 37,
The force is transmitted from the thrust transmitting band 31 to the thrust transmitting flange 38 via the contact portions 44, and the flange main body 39 of the thrust transmitting flange 38 is in contact with the end face 25 of the receiving port 13, so that the receiving port 13 Is transmitted to. At this time, as shown in FIG. 1, even when the second thrust transmitting plate 43 of the thrust transmitting flange 38 is located outside the outer peripheral surface 42 of the receiving port 13 along the pipe diameter direction. The first rib 41 backs up the propulsive force, so that it is possible to reliably prevent the thrust transmitting flange 38 from falling down from the end face 25 of the receiving port 13 due to the propulsive force. . When the propulsive force is transmitted in a state where the inclined surfaces 37 and 44 are in contact with each other, a force is applied to the second thrust transmitting plate 43 such that the second thrust transmitting plate 43 is deformed outward in the pipe diameter direction. The provision of the second rib 45 can reliably prevent such deformation during propulsion. Further, at the time of propulsion, the second thrust transmitting plate 43 presses the first thrust transmitting plate 36, that is, the thrust transmitting band 31 inward in the pipe diameter direction via the inclined surfaces 44, 37, The opening 14 is formed by the action of
In order to disperse the propulsion force in the direction to increase the holding force of the thrust transmission band 31 with respect to the thrust transmission band 31, the occurrence of a situation where the thrust transmission band 31 loses the propulsion force and slides on the outer surface of the insertion port 14 in the pipe axis direction, It can be effectively prevented. Further, since the flange body 39 of the thrust transmitting flange 38 is merely hung on the bolt 24 by the notch recess 40, the flange body 39 has a degree of freedom with respect to the bolt 24. Even if bending occurs with the insertion opening 14, it is possible to prevent an excessive force from being applied to the bolt 24. By transmitting the propulsive force from the insertion port 14 to the receiving port 13 in this manner, the pipes 12, 12,... Are supported on the inner surface of the sheath pipe 10 by the casters 35, and the pipes 12, 12,. The inside of the sheath tube 10 is laid by a propulsion method. Specifically, when the propulsion is completed, as shown in FIG. 1, the annular projection 23 is located between the lock ring 21 and the rear end face 19, and the inclined surface 37 of the thrust transmission band 31 and the thrust transmission band In a state where the inclined surface 44 of the flange 38 is in contact with the flange body 39 and the flange main body 39 is in contact with the end surface 25 of the socket 13,
A pipeline is laid. When a force acts in a direction in which the insertion opening 14 comes out of the reception opening 13 at the time of occurrence of an earthquake or the like, FIG.
As shown in the figure, the movements of the pipes 12, that is, the insertion opening 14 and the receiving opening 13 are not restricted by the thrust transmission band 31 and the thrust transmission flange 38, and the thrust transmission band 31 is integrated with the insertion opening 14. And move away from the thrust transmitting flange 38. In this way, the insertion port 14 becomes the reception port 13
And the annular protrusion 23 engages with the lock ring 21 to withstand a certain detaching force, whereby a required earthquake-resistant function is exhibited in the extension direction of the pipe joint. Contrary to the above, when a force acts in a direction in which the insertion port 14 enters the reception port 13 and the force is not so large, the force is the same as in the case of propulsion shown in FIG. It is only transmitted between the receiving port 13 and the insertion port 14 by the thrust transmitting band 31 and the thrust transmitting flange 38. On the other hand, when a large force acts,
As shown in FIG. 6, the first thrust transmission plate 36 of the thrust transmission band 31 acts to push and spread the second thrust transmission plate 43 of the thrust transmission flange 38 by the wedge action of the inclined surface 37. . As a result, as shown in FIG.
Of the thrust transmitting plate 43 is deformed outward in the pipe diameter direction, and as a result, the insertion port 14 can enter the inside of the receiving port 13,
The front end surface 29 can withstand a constant compressive force by hitting the rear end surface 19 of the socket 13. Thereby, the required seismic function is exhibited in the shortening direction of the pipe joint. In this way, it is possible to lay a pipeline having a seismic resistant pipe joint so that the required joint expansion / contraction amount is maintained after the propulsion work. In addition, instead of providing the rib 45 as described above, a plurality of second
An annular body such as a band or a short tube is fitted around the thrust transmitting plate 43 of the above, or the periphery of the second thrust transmitting plate 43 is tied into a polygonal shape with a string or a band. The second thrust transmission plate 43 can be reinforced. In such a case, at the time of an earthquake or the like, the reception port 13 and the insertion port 1
When a large intrusion force acts between them, the above-mentioned ring-shaped body, string-shaped body, or band-shaped body is configured to be torn, so that the insertion opening 14 similarly enters the inside of the receiving opening 13 and The front end face 29 can be made to hit the rear end face 19. FIG. 7 shows another embodiment of the present invention.
Here, an example is shown in which the earthquake-resistant pipe joint is a so-called slip-on structure pipe joint in which the joint can be joined simply by inserting an insertion port into the inside of the receiving port 13. More specifically, a sealing material 52 is disposed in the sealing material accommodating groove 51 on the inner periphery of the receiving port 13.
Lock ring receiving groove 5
3 is formed, and a lock ring 54 divided in the circumferential direction is mounted in the accommodation groove 53. The lock ring 54 is fastened to the outer periphery of the insertion opening 14. Between the outer periphery of the lock ring 54 and the inner periphery of the accommodation groove 51, the lock ring 54 is centered with respect to the socket 13 at the time of joining the joint. A holding rubber ring 55 is provided for holding in a state of being set. A tapered surface 56 is formed on the outer periphery of the distal end of the insertion opening 14. In the case of the pipe joint shown in FIG. 7, since it is not necessary to screw a bolt into the receiving port 13, the thrust transmitting flange 38 has its flange body 39 in contact with the end face 25 of the receiving port 13. The first rib 41 is attached to the receiving port 13 in a state where the first rib 41 is in contact with the outer peripheral surface of the receiving port 13, that is, in a state where the first rib 41 is in contact with the end face 25 of the opening in the receiving port 13 and is fitted to the outer peripheral edge thereof. Is done. At the time of joining the joint, the lock ring 54
The insertion port 14 with the thrust transmission flange 38 fitted therein is inserted into the receiving port 13 with the holding rubber ring 55 and the sealing material 52 attached. Then, the opening 14
While the seal member 52 and the lock ring 54 are being pushed and spread by the action of the tapered surface 56, the annular projection 23 enters the inside of the receiving port 13 until it is deeper than the lock ring 54 and behind the receiving port 13, whereby a predetermined Will be provided with an earthquake-resistant function. The method of laying a pipeline by the propulsion method and the behavior when an external force due to an earthquake acts are shown in FIG.
6 to the embodiment shown in FIG. As described above, according to the present invention, in the seismic pipe joint for the propulsion method, an inclined surface is formed outside the insertion port outside the receiving port, and the receiving port has a thrust force in the pipe axis direction. A transmission member is mounted, and the propulsion force transmission member is configured such that a tip portion thereof is in contact with the inclined surface, so that propulsion force can be transmitted between the insertion port and the reception port when the pipeline is laid. In addition, when a force larger than the propulsion force acts between the insertion port and the receiving port, it is deformed by the action of the inclined surface based on the force, and further insertion of the insertion port into the receiving port is performed. Because it is configured to allow entry, when the pipeline is laid, the propulsion force transmitting member in the axial direction of the pipe attached to the receiving port is in contact with the inclined surface formed outside the insertion port. , Transmission of propulsion force between the inlet and outlet If a force acts in a direction in which the insertion hole comes out of the receiving port during the occurrence of an earthquake, the propulsion force transmitting member and the inclined surface only contact each other, so that they are separated from each other,
This makes it possible to exert the seismic resistance of the pipe joint.On the contrary, when a force acts in the direction where the insertion port enters the receiving port during an earthquake, if the force is not so large, the force is reduced. It can only be transmitted between the receiving opening by the inclined surface and the propulsion force transmitting member, and when the force increases, the wedge action of the inclined surface formed outside the inserting hole can be achieved. As a result, the propulsion force transmitting member is deformed, and further insertion of the insertion port into the receiving port is allowed, whereby a predetermined earthquake-resistant function can be exhibited.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of a seismic pipe joint for a propulsion method according to an embodiment of the present invention. FIG. 2 is a diagram for explaining a laying state of a seismic pipe having a pipe joint of FIG. 1 for a propulsion method. FIG. 3 is a transverse sectional view of a portion shown in FIG. 2; FIG. 4 is a detailed view of a thrust transmitting flange in FIGS. 1 and 2; FIG. 5 is a view showing a state when a force in a pull-out direction acts on a pipe joint. FIG. 6 is a diagram showing a state when a large force in the pushing direction acts on the pipe joint. FIG. 7 is a sectional view of a seismic pipe joint for a propulsion method according to another embodiment of the present invention. [Description of Signs] 13 Receptacle 14 Insertion port 31 Thrust transmitting band 36 First thrust transmitting plate 37 Inclined surface 38 Thrust transmitting flange 43 Second thrust transmitting plate 44 Inclined surface

Claims (1)

Claims: 1. A tube having a receiving port at an end thereof, and an insertion port having an insertion port at an end thereof, wherein the insertion port is inserted into the receiving port in such a manner as to prevent detachment. A propulsion method seismic pipe coupling configured to transmit a propulsion force at the time of laying a pipeline between the other pipe and an inclined surface formed outside the insertion port outside the receiving port, A propulsion force transmission member in the pipe axis direction is attached to the receiving port,
This propulsion force transmission member is configured such that the tip end thereof is in contact with the inclined surface, and is configured so as to be able to transmit the propulsion force between the insertion port and the reception port when the pipeline is laid, When a force greater than the propulsion force acts between the insertion port and the receiving port, the port is deformed by the action of the inclined surface based on the force, so that further insertion of the insertion port into the receiving port can be allowed. An earthquake-resistant pipe joint for a propulsion method characterized by being constituted.