JP3907486B2 - Seismic pipe joint for propulsion method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a seismic pipe joint for a propulsion method.
[0002]
[Prior art]
There is a so-called earthquake-resistant pipe joint as a kind of pipe joint in which an insertion opening formed at the end of the other pipe is inserted into a receptacle formed at the end of one pipe. This earthquake-resistant pipe joint prevents detachment of the insertion opening from the receiving opening and allows expansion and contraction between the receiving opening in a certain range. As such an earthquake-resistant pipe joint, for example, a lock ring is attached to the inner periphery of the receiving port, and a protrusion is formed on the outer periphery of the insertion port so that the protruding portion engages with the lock ring from the back side of the receiving port. The insertion port is inserted into the receiving port and connected with a distance between the lock ring and the protrusion and between the insertion port tip and the receiving port back end.
[0003]
With such a configuration, it is possible to insert the insertion port into the receiving port until the tip of the insertion port hits the inner end of the receiving port, and the protruding portion of the insertion port engages with the lock ring of the receiving port. The insertion hole can be removed from the receptacle until it fits. That is, the joint can be expanded and contracted within a certain range.
[0004]
By the way, there is a propulsion method as a kind of pipe laying method. In this method, for example, a pipe is laid by propelling a new pipe in a sheath pipe previously laid in the ground or an existing old pipe.
[0005]
In the pipe for this propulsion method, the propulsive force in the pipe axis direction is transmitted between the receiving port in 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 the insertion port, and the insertion port is inserted into the reception port and the flange is brought into contact with the reception port opening end. There is one that can transmit the driving force between the insertion port and the receiving port.
[0006]
[Problems to be solved by the invention]
However, when laying pipes by the above-mentioned propulsion method, in the laying completion state, the insertion flanges hit the receiving opening ends of all the pipe joints in the pipes laid from the start pit to the arrival pit. I have to be in the state of being. Therefore, after the laying is completed, the insertion port cannot enter further into the receiving port. For this reason, there is a problem that it is practically impossible to lay a pipe line having a pipe joint having the above-mentioned telescopic earthquake-resistant structure by a propulsion method.
[0007]
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve such problems and enable a pipeline having an earthquake-resistant pipe joint to be laid by a propulsion method.
[0008]
[Means for Solving the Problems]
In order to achieve this object, the present invention has one tube having a receiving port at the end and an insertion port at the end, and the insertion port is inserted into the receiving port in a state in which it is prevented from being detached. In the seismic pipe joint for propulsion method constructed so that the propulsive force at the time of pipe laying is transmitted to the other pipe, an inclined surface is formed outside the insertion port on the outside of the receiving port. A propulsive force transmission member in the direction of the tube axis is mounted, and this propulsive force transmission member is configured such that its tip is in contact with the inclined surface, and propulsive force is transmitted between the insertion port and the receiving port when the pipe is laid. When a force larger than the propulsive force is applied between the insertion port and the receiving port, the inner surface is deformed by the action of the inclined surface based on the force, and the inside of the receiving port is configured. It is configured to allow further insertion of the insertion opening into the.
[0009]
With such a configuration, at the time of laying the pipe line, the tip of the propulsive force transmitting member in the tube axis direction attached to the receiving port is in contact with the inclined surface formed outside the insertion port outside the receiving port. In the state, the propulsive force is transmitted between the receiving opening. In the event of an earthquake, when a force is applied in the direction in which the insertion port is pulled out from the receiving port, the propulsive force transmitting member and the inclined surface are only in contact with each other, so that they are separated from each other, whereby the pipe joint The seismic function will be demonstrated. On the other hand, when a force is applied in the direction in which the insertion port enters the receiving port when an earthquake occurs, if the force is not so large, the force is generated between the receiving port insertion port by the inclined surface and the propulsive force transmitting member. It is only transmitted to. When the force increases, the propulsive force transmitting member is deformed by the wedge action of the inclined surface formed outside the insertion opening, and further insertion of the insertion opening is allowed into the receiving opening. The earthquake resistance function will be demonstrated.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
2 and 3, reference numeral 10 denotes a sheath tube, which is embedded in the ground in advance. Reference numeral 11 denotes a pipe line laid by the propulsion method inside the sheath pipe 10 and has a configuration in which a plurality of ductile cast iron pipes 12 are joined to each other.
[0011]
As shown in FIGS. 1 to 3, a receiving port 13 is formed at the end of one of the pipes 12, 12 to be joined together, and the receiving port 13 is formed at the end of the other tube. An insertion slot 14 to be inserted inside is formed. Lining layers 15 and 15 are formed on the inner periphery of the pipes 12 and 12. A tapered sealing material pressure contact surface 16, a lock ring receiving groove 17, and an inner peripheral surface 18 are formed in this order from the opening end side on the inner periphery of the receiving port 13. Reference numeral 19 denotes a rear end face of the receiving port. An annular rubber sealing material 20 is disposed between the pressure contact surface 16 of the receiving port 13 and the outer peripheral surface of the insertion port 14, and a lock ring 21 is accommodated in the accommodation groove 17. A backup ring 22 is provided between the sealing material 20 and the lock ring 21. The lock ring 21 is divided into one piece in the circumferential direction, and is housed in the housing groove 17 in a state of being fastened to the outer periphery of the insertion opening 14.
[0012]
An annular protrusion 23 is formed on the outer periphery of the distal end of the insertion opening 14 on the back side of the receiving port 13 with respect to the lock ring 21, and this annular protruding portion 23 engages with the lock ring 21 from the back side of the receiving port 13. It is possible.
[0013]
One end of a plurality of bolts 24 is screwed into the receiving port 13 in the tube axis direction from the end face 25 of the receiving port 13 in the circumferential direction, and is fitted to the insertion port 14 at a portion outside the receiving port 13. The other end of the bolt 24 is passed through the pressed wheel 26. Then, by screwing the nut 27 onto the bolt 24, the pressure contact surface 16 of the receiving port 13 and the outer peripheral surface of the insertion port 14 are connected via the presser wheel 26 and the split ring 28 provided on the inner peripheral side of the presser wheel 26. It is comprised so that the sealing material 20 can be compressed between.
[0014]
By compressing the sealing material 20 in this manner, the receiving port 13 and the insertion port 14 are separated from the distal end surface 29 of the insertion port 14 while the lock ring 21 and the annular protrusion 23 are spaced apart from each other in the tube axis direction. The rear end surface 19 of the receiving port 13 is joined to each other so as to be in a state of being spaced apart in the tube axis direction.
[0015]
In this state where the receiving port 13 and the insertion port 14 are joined to each other, an annular thrust transmission band 31 is provided at the portion of the insertion port 14 at a position spaced from the receiving port 13 in the tube axis direction. It is fixed in a fitted state. Specifically, in this thrust transmission band 31, 32 is a cylindrical band body, which is divided into two parts in the circumferential direction, and a divided part 33 along the circumferential direction is fastened by a bolt / nut 34. Thus, the outer periphery of the insertion opening 14 is fixed. In order to prevent the thrust transmission band 31 from sliding along the outer surface of the insertion opening 14 particularly in the tube axis direction in this fixed state, a band-like shape is formed between the inner periphery of the band main body 32 and the outer periphery of the insertion opening 14. It is preferable to interpose a rubber plate or the like. At a plurality of positions along the circumferential direction on the outer surface of the band body 32, casters 35 that can roll the inner surface of the sheath tube 10 along the tube axis direction are attached by welding or the like while standing up from the band body 32. ing. In addition, the first thrust transmission plate 36 stands radially so that the plate thickness direction is the circumferential direction of the insertion opening 14 at other positions along the circumferential direction on the outer surface of the band main body 32. It is attached by welding. The first thrust transmission plate 36 is formed with an inclined surface 37 that is inclined so as to be closer to the central axis of the insertion opening 14 as it approaches the receiving opening 13.
[0016]
An annular thrust transmission flange 38 is attached to the end face 25 of the receiving port 13. As shown in FIGS. 1 to 4, the thrust transmission flange 38 includes a flange main body 39 formed of an annular plate, and the flange main body 39 extends in the radial direction of the pipe 12 in each bolt 24. By having a semicircular cutout recess 40 that hangs on the outer semicircular portion along the outer circumference, the pitch circle portion formed by the plurality of bolts 24 is concentrically fitted to the receiving port. Yes. In this state, the flange main body 39 can contact the end face 25 of the receiving port 13. First ribs 41 are provided at a plurality of positions along the circumferential direction of the thrust transmission flange 38. One end of each first rib 41 is fixed to the flange main body 39 by welding or the like, and when the flange main body 39 is in contact with the end face 25 of the receiving port 13, the other end is the end of the receiving port 13. It is comprised so that the outer peripheral surface 42 may be contact | connected. Further, the thrust transmission flange 38 is provided with second thrust transmission plates 43 in the tube axis direction as propulsive force transmission members at a plurality of positions along the circumferential direction. The thrust transmission plate 43 is arranged so that the thickness direction thereof is the radial direction of the tube 12, the base end portion is fixed to the flange main body 39 by welding or the like, and the tip end portion is the first thrust. It is configured to contact the transmission plate 36. An inclined surface 44 that can contact the inclined surface 37 of the first thrust transmission plate 36 is formed at the tip of the second thrust transmission plate 43. A second rib 45 is provided at a position on the outer side of the second thrust transmission plate 43 along the radial direction of the tube 12. One end of the second rib 45 is fixed to the second thrust transmission plate 43 by welding or the like, and the other end is fixed to the flange main body 39 by welding or the like.
[0017]
In such a configuration, when the receiving opening 13 and the insertion opening 14 of the pipes 12 and 12 are joined to each other, first, the push ring 26, the split ring 28, the sealing material 20, the backup ring 22 and the thrust transmission are transmitted to the insertion opening 14. The flange 38 is fitted in advance. On the other hand, the lock ring 21 is accommodated in the receiving groove 17 of the receiving port 13, and the diameter of the lock ring 21 is expanded by a jig so that the annular protrusion 23 of the insertion port 14 can pass through the inside.
[0018]
In this state, the insertion opening 14 is inserted into the receiving opening 13, the annular protrusion 23 at the tip of the insertion opening 14 passes through the lock ring 21, and the annular protrusion 23 is inserted into the locking ring 21 and the rear end face 19 of the receiving opening 13. Insertion is stopped, the diameter of the lock ring expanded by the jig is released, and the elastic force is applied to the outer periphery of the insertion opening 14. Thereafter, the flange main body 39 of the thrust transmission flange 38 is disposed on the outer peripheral side of the bolt 24 and is brought into contact with the end face 25 of the receiving port 13, and the backup ring 22 and the sealing material 20 are connected to the receiving port 13 and the insertion port. 14, the split ring 28 is brought into contact with the end surface of the sealing material 20, and the bolts 24 are arranged so as to pass through the press ring 26 in a state where the press ring 26 is engaged with the split ring 28. Are screwed onto the bolt 24 and fastened.
[0019]
Since the joining of the receiving port 13 and the insertion port 14 is completed in this state, next, the thrust transmission band 31 is fitted to the portion of the insertion port 14 outside the receiving port 13, and the first thrust transmission plate With the inclined surface 37 of 36 in contact with the inclined surface 44 of the second thrust transmission plate 43 and the flange main body 39 of the thrust transmission flange 38 in contact with the end surface 25 of the receiving port 13, the thrust is transmitted by the bolts and nuts 34. The band 31 is fixed to the outer periphery of the insertion slot 14.
[0020]
When laying pipes 12, 12,... Inside the sheath tube 10, a tube in which the receiving port 13 and the insertion port are joined to each other and the thrust transmission band 31 is mounted as described above. The joint is propelled inside the sheath tube 10.
[0021]
At this time, for example, when propulsive force is transmitted from the insertion port 14 to the receiving port 13, this propulsive force is transmitted from the insertion port 14 to the thrust transmission band 31 and is made via a contact portion between the inclined surfaces 37 and 44. Then, the force is transmitted from the thrust transmission band 31 to the thrust transmission flange 38, and the flange main body 39 of the thrust transmission flange 38 is in contact with the end face 25 of the reception port 13, so that it is transmitted to the reception port 13.
[0022]
At this time, even when the second thrust transmission plate 43 of the thrust transmission flange 38 is positioned outside the outer peripheral surface 42 of the receiving port 13 along the pipe radial direction as shown in FIG. Therefore, it is possible to reliably prevent the thrust transmission flange 38 from falling in the direction away from the end face 25 of the receiving port 13 due to this propulsive force.
[0023]
Further, when the propulsive force is transmitted while the inclined surfaces 37 and 44 are in contact with each other, a force that deforms outward in the radial direction of the tube acts on the second thrust transmission plate 43. By providing the rib 45, it is possible to reliably prevent such deformation during propulsion.
[0024]
Further, during propulsion, the second thrust transmission plate 43 presses the first thrust transmission plate 36, that is, the thrust transmission band 31 inward in the pipe radial direction via the inclined surfaces 44, 37, that is, the inclined surface 44, 37, in order to disperse the propulsive force in the direction of increasing the holding force of the thrust transmission band 31 with respect to the insertion port 14, the thrust transmission band 31 loses the propulsion force and slides the outer surface of the insertion port 14 in the tube axis direction. Such a situation can be effectively prevented. Further, since the flange main body 39 of the thrust transmission flange 38 is only hooked on the bolt 24 by the notch recess 40, the flange main body 39 has a degree of freedom with respect to the bolt 24. Even if bending occurs between the insertion opening 14 and the bolt 24, it is possible to prevent an excessive force from being applied to the bolt 24.
[0025]
By transmitting the propulsive force from the insertion port 14 to the receiving port 13 in this way, the tubes 12, 12,... Are supported by the casters 35 on the inner surface of the sheath tube 10 and without resistance, the sheath tube 10. It is laid by the propulsion method.
[0026]
Specifically, when propulsion is completed, as shown in FIG. 1, the annular protrusion 23 is positioned between the lock ring 21 and the back end surface 19, and the inclined surface 37 of the thrust transmission band 31 and the thrust transmission flange 38 are The pipe line is laid in a state where the inclined surface 44 is in contact and the flange main body 39 is in contact with the end surface 25 of the receiving port 13.
[0027]
In the event of an earthquake or the like, if a force acts in the direction in which the insertion slot 14 is pulled out from the reception opening 13, as shown in FIG. 5, the movement of the pipes 12, 12, that is, the insertion opening 14 and the reception opening 13, The thrust transmission band 31 and the thrust transmission flange 38 are not constrained, and the thrust transmission band 31 is integrated with the insertion opening 14 and away from the thrust transmission flange 38. In this way, the insertion port 14 can come out of the receiving port 13, and the annular protrusion 23 can be engaged with the lock ring 21 to withstand a certain detachment force. Seismic function is demonstrated.
[0028]
On the contrary, when a force is applied in the direction in which the insertion slot 14 enters the receiving slot 13, if the force is not so large, the force is transmitted 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 band 31 and the thrust transmission flange 38.
[0029]
On the other hand, when a large force is applied, the first thrust transmission plate 36 of the thrust transmission band 31 is moved by the wedge action of the inclined surface 37 as shown in FIG. The thrust transmission plate 43 is pushed and spread. As a result, the second thrust transmission plate 43 is deformed outward in the tube radial direction as shown in the figure, and as a result, the insertion port 14 can enter the interior of the receiving port 13, and its distal end surface 29 is the receiving port. It is possible to withstand a certain compressive force by hitting the rear end surface 19 of 13. Thereby, the required seismic function is exhibited in the shortening direction of the pipe joint.
[0030]
In this way, a pipe line having a seismic structure pipe joint can be laid so that a required joint expansion and contraction amount is maintained after propulsion.
Instead of providing the ribs 45 as described above, an annular body such as a strip or a short cylinder is fitted around the plurality of second thrust transmission plates 43 in the circumferential direction, or the second thrust is applied. The second thrust transmission plate 43 can be reinforced by binding the periphery of the transmission plate 43 to a polygonal shape with a string-like body or a belt-like body. In such a case, when a large intrusion force acts between the receiving port 13 and the insertion port 14 in the event of an earthquake or the like, the above-described annular body, string-shaped body, or belt-shaped body is torn off. Similarly, the insertion opening 14 can enter the interior of the receiving opening 13 so that the distal end surface 29 of the insertion opening 14 abuts the back end surface 19.
[0031]
FIG. 7 shows another embodiment of the present invention. Here, a case where the earthquake-resistant pipe joint is a pipe joint having a so-called slip-on structure in which the joint can be joined only by inserting the insertion opening into the receiving port 13 is illustrated.
[0032]
Specifically, a sealing material 52 is disposed in the sealing material receiving groove 51 on the inner periphery of the receiving port 13, and a lock ring receiving groove 53 is formed on the inner periphery of the receiving port 13 on the inner side of the receiving groove 51. The housing groove 53 is provided with a circumferentially divided lock ring 54. The lock ring 54 is fastened to the outer periphery of the insertion opening 14, and between the outer periphery of the lock ring 54 and the inner periphery of the receiving groove 51, the lock ring 54 is centered with respect to the receiving opening 13 when the joint is joined. A holding rubber ring 55 is provided for holding in this state. A tapered surface 56 is formed on the outer periphery of the distal end portion of the insertion opening 14.
[0033]
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 transmission flange 38 has its flange body 39 in contact with the end face 25 of the receiving port 13, and the first The rib 41 is attached to the receiving port 13 in a state where the rib 41 is in contact with the outer peripheral surface of the receiving port 13, that is, in a state where the rib 41 is in contact with the end surface 25 of the opening of the receiving port 13 and is fitted to the outer peripheral edge.
[0034]
When the joint is joined, the insertion port 14 with the thrust transmission flange 38 fitted outside is inserted into the receiving port 13 with the lock ring 54, the holding rubber ring 55, and the sealing material 52 attached. To do. Then, the insertion port 14 pushes and expands the sealing material 52 and the lock ring 54 by the action of the taper surface 56, and the annular protrusion 23 is located on the back side of the reception port 13 with respect to the lock ring 54. It will enter the interior and this will give it a predetermined seismic function.
[0035]
The method of laying a pipeline by the propulsion method and the behavior when an external force due to an earthquake is applied are the same as those of the embodiment shown in FIGS.
[0036]
【The invention's effect】
As described above, according to the present invention, in the earthquake-resistant pipe joint for propulsion method, an inclined surface is formed outside the insertion port outside the receiving port, and a propulsive force transmission member in the tube axis direction is attached to the receiving port. The force transmission member is configured such that a tip portion thereof is in contact with the inclined surface, and configured to transmit a propulsive force between the insertion port and the receiving port when the pipe is laid, When a force larger than the propulsive force is applied between the receiving port and the receiving port, it is deformed by the action of the inclined surface based on the force and allows further insertion of the inserting port into the receiving port. Therefore, when laying pipes, propulsion is performed between the receiving mouths with the tip of the propulsive force transmission member attached to the receiving port in the axial direction in contact with the inclined surface formed outside the opening. Force transmission, and in the event of an earthquake When a force acts in the direction of exiting from the mouth, the propulsive force transmitting member and the inclined surface are only in contact with each other, so that they are separated from each other, thereby allowing the seismic function of the pipe joint to be exhibited, On the other hand, when a force is applied in the direction in which the insertion port enters the receiving port when an earthquake occurs, if the force is not so large, the force is generated between the receiving port insertion port by the inclined surface and the propulsive force transmitting member. In addition, when the force is increased, the propulsive force transmitting member is deformed by the wedge action of the inclined surface formed outside the insertion slot, and is moved into the receiving port. Further insertion of the insertion opening is allowed, and thereby a predetermined seismic function can be exhibited.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a seismic pipe joint for a propulsion method according to an embodiment of the present invention.
FIG. 2 is a view for explaining a laying state of a seismic pipe for a propulsion method having the pipe joint of FIG. 1;
3 is a cross-sectional view of the portion shown in FIG.
4 is a detailed view of a thrust transmission flange in FIGS. 1 and 2. FIG.
FIG. 5 is a diagram showing a state when force in the pulling direction is applied to the pipe joint.
FIG. 6 is a view showing a state when a large force in the pushing direction is applied to the pipe joint.
FIG. 7 is a cross-sectional view of a seismic pipe joint for a propulsion method according to another embodiment of the present invention.
[Explanation of symbols]
13 Receiving port 14 Inserting 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)

Laying a pipe line between one pipe having a receiving opening at the end and the other pipe having an insertion opening at the end and inserted in a state in which the insertion opening is prevented from being detached inside the receiving opening A seismic pipe joint for a propulsion method configured to transmit the propulsive force at the time, and an inclined surface is formed outside the insertion port outside the receiving port, and a propulsive force transmitting member in the tube axis direction at the receiving port The propulsive force transmitting member is configured such that the tip portion thereof is in contact with the inclined surface, and configured to transmit propulsive force between the insertion port and the receiving port when laying a pipeline. In addition, when a force larger than the propulsive force is applied 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. A seismic pipe joint for propulsion method, characterized by being configured to be acceptable.

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