JP4175754B2 - Propulsion pipe with earthquake resistance function - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a propulsion pipe having an earthquake resistance function.
[0002]
[Prior art]
A propulsion method is known in which a pipe is laid by propelling a pipe into the ground. The propulsion pipe used in this propulsion method has an insertion opening formed at the end of the other pipe inserted into the reception opening formed at the end of one of the pipes joined to each other. Propulsive force is transmitted to and from the insertion port. This propulsive force is transmitted in a state where the insertion port is completely inserted into the receiving port, and therefore, when the laying of the pipeline is completed, the insertion port cannot enter the receiving port any more.
[0003]
On the other hand, there is known an earthquake resistant tube provided with a separation preventing function and an expansion / contraction function between the receiving port and the insertion port. In this earthquake-resistant pipe, when an earthquake occurs after laying the pipeline, the expansion and contraction margin is allowed to allow the insertion slot to exit from and enter the receiving area within a certain range due to the seismic force. It is formed in the joint part with the insertion port. That is, in the seismic tube, the insertion port must not be completely in the receiving port when the laying of the pipeline is completed.
[0004]
In order to be able to lay such a seismic tube by the propulsion method, Japanese Patent Application No. 11-277681 proposes a configuration shown in FIGS.
That is, in FIG. 3, a receiving port 12 is formed at the end of one cast iron pipe 11 constituting a pipe joint and joined to each other, and the end of the other cast iron tube 13 is formed inside the receiving port 12. An insertion slot 14 to be inserted is formed.
[0005]
An annular rubber seal material 17 is disposed in the seal material accommodation groove 16 on the inner periphery of the receiving port 12. A lock ring receiving groove 18 is formed in the inner periphery of the receiving port 12 on the inner side of the seal material receiving groove 16, and a metal lock ring 19 divided in the circumferential direction is attached to the receiving groove 18. . Between the outer periphery of the lock ring 19 and the inner periphery of the receiving 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 disposed. Reference numeral 21 denotes a rear end face of the receiving port 12, which is formed at a predetermined distance from the lock ring 19 accommodated in the accommodation groove 18. Reference numeral 15 denotes an inner peripheral surface of the receiving port 12 between the lock ring housing groove 18 and the back end surface 21.
[0006]
On the outer periphery of the distal end portion of the insertion opening 14, a protrusion 22 that can engage with the lock ring 19 from the back side of the receiving opening 12 is formed. A tapered surface 23 is formed on the outer periphery of the distal end of the insertion opening 14 including the protrusion 22 and serves as a guide when the insertion opening 14 is inserted into the receiving opening 12 in which the sealing material 17 and the lock ring 19 are accommodated. Has 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 back end surface 21 described above. Therefore, the insertion opening 14 can be moved relative to the receiving opening 12 in the tube axis direction in a range until the protrusion 22 hits the lock ring 19 or the back end face 21.
[0007]
An annular metal propulsive force transmission member 25 is disposed on the outer periphery of the insertion opening 14 outside the receiving opening 12, that is, at a portion not entering the receiving opening 12. As shown in FIGS. 3 and 4, the propulsive force transmission member 25 has a rectangular cross section and is divided into two parts in the circumferential direction. Reference numeral 26 denotes the division unit. In this split portion 26, radially outward projecting portions 27, 27 are formed at circumferential ends of the propulsive force transmitting member 25, respectively, and these projecting portions 27, 27 are connected by fastening elements 28 such as bolts and nuts. By being fastened, the propulsive force transmission member 25 is assembled in an annular shape and fastened to the outer periphery of the insertion opening 14. In the state assembled in this annular shape and fastened to the outer periphery of the insertion opening 14, the propulsive force transmission member 25 can have its one end and the protruding portion 27 of the dividing portion 26 abut against the end surface 29 of the receiving opening 12. It is configured.
[0008]
In such a configuration, when joining the pipes 11 and 13, the rubber ring 20, the lock ring 19, and the sealing material 17 are attached to the inside of the receiving port 12, and the tube is inserted into the inside of the receiving port 12 in that state. Mouth 14 is inserted. Then, the protrusion 22 at the tip of the insertion opening 14 spreads the sealing material 17, the lock ring 19, and the rubber ring 20 by the action of the tapered surface 23, and passes through the positions of the sealing material 17 and the lock ring 19. . As a result, as shown in FIG. 3, the protrusion 22 at the distal end of the insertion opening 14 is located at an intermediate portion between the lock ring 19 and the back end surface 21 along the tube axis direction.
[0009]
In this state, the driving force transmission member 25 is fitted on the outer periphery of the insertion port 14 outside the receiving port 12, and the driving force transmission member 25 is fixed to the outer periphery of the insertion port 14 by the fastening element 28. At this time, one end of the propulsive force transmitting member 25 and the protruding portion 27 are brought into contact with the end surface 29 of the receiving port 12.
When laying the pipeline, the pipes 11 and 13 in this state are propelled into the ground. In this case, for example, when propulsive force is transmitted from the insertion port 14 to the receiving port 12, the propulsive force is transmitted from the insertion port 14 to the propulsive force transmission member 25 by a frictional force caused by fastening. When the end surface 29 of the receiving port 12 is pushed, the light is transmitted to the receiving port 12. That is, the pipes 11 and 13 are propelled in the state shown in FIG. 3, and the pipe line is laid in the state shown in FIG.
[0010]
The behavior when a force in the tube axis direction acts on the joint when an earthquake occurs is as follows.
When a force is applied in the direction in which the insertion opening 14 enters the receiving opening 12, if the force is not so large, this force is between the insertion opening 14 and the receiving opening 12 as in the case of the propulsive force described above. It is transmitted by, and no expansion or contraction occurs between the two. On the other hand, when a large force is applied, slip occurs between the insertion opening 14 and the propulsive force transmission member, and the insertion opening 12 can enter the interior of the receiving opening 12 until it comes into contact with the back end surface 21.
[0011]
When a force is applied in a direction in which the insertion opening 14 is pulled out from the receiving opening 12, the movement of the tubes 11 and 13 is not restricted by the propulsion transmission member 25, and the propulsion transmission member in a state of being fastened to the insertion opening 14. 25 is moved away from the receiving port 12 as it is. Finally, the protrusion 22 of the insertion port 14 is engaged with the lock ring 19, and the removal of the insertion port 14 from the receiving port 12 is reliably prevented.
[0012]
In this way, the expansion / contraction function and the separation prevention function of the joint portion when an earthquake occurs are ensured, and the performance as an earthquake-resistant joint is obtained.
In the propulsion pipe having such an earthquake-resistant function, as shown by a virtual line in FIG. 3, the protrusion of the insertion port 14 is in contact with the inner peripheral surface 15 of the receiving port 12 on the back side of the lock ring 19. In the range, the receiving port 12 and the insertion port 14 are relatively bendable. Thereby, it is comprised so that it can respond at the time of the earthquake occurrence after the laying of a pipe line, or the subsidence of the ground.
[0013]
[Problems to be solved by the invention]
However, since the gap between the receiving port 12 and the insertion port 14 can be bent in this manner, bending occurs even during propulsion when the pipe is laid, and the propulsive force is not improved along the circumferential direction of the pipe. May be uniform. In addition, when the propulsion path is curved, the receiving port 12 and the insertion port 14 may be bent instead of being aligned. Then, in a portion where the protrusion 22 of the insertion opening 14 bends in a direction approaching the inner peripheral surface 15 of the receiving opening 12, the inner periphery of the receiving opening 12 and the outer periphery of the insertion opening 14 are formed at the end surface 29 of the receiving opening 12. There may be a large gap.
[0014]
At this time, the propulsive force transmitting member 25 has a protruding portion 27 that contacts the end surface 29 of the receiving port 12 even if the gap between the receiving port 12 and the insertion port 14 becomes large in the dividing portion 26, but the circumferential direction from the dividing portion 26 In the position where the distance is kept at a distance, the gap between the receiving opening 12 and the insertion opening 14 may be larger than the thickness of the propulsive force transmitting member 25.
Then, at that position, the propulsive force transmitting member 25 may enter the gap between the receiving port 12 and the insertion port 14 during the propulsion work. As a result, there is a possibility that the receiving port 12 and the insertion port 14 do not cause a required bending operation during laying and after laying, and the propulsive force can be transmitted evenly along the circumferential direction of the pipes 11 and 13 during laying. It may disappear.
[0015]
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve such problems and prevent a propulsive force transmitting member from entering a gap between a receiving port and an insertion port during propulsion work.
[0016]
[Means for Solving the Problems]
In order to achieve this object, according to the present invention, the propulsive force transmitting member has a first radial projecting portion that can contact the end face of the receiving port at the circumferentially divided portion, and extends circumferentially from the divided portion. A second radial projecting portion capable of contacting the end face of the receiving port is provided at a distance.
[0017]
With such a configuration, the propulsive force transmitting member has a protruding portion in the radial direction at the position spaced from the divided portion in the circumferential direction, so that there is a gap between the receiving port and the insertion port. Even if it becomes larger, the projecting portion hits the end face of the receiving port, so that the propulsive force transmitting member is prevented from entering the gap between the receiving port and the insertion port.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 and 2. 1 and FIG. 2 are different from FIG. 3 and FIG. 4 only in the configuration of the propulsive force transmission member 31, and the configurations of the receiving port 12 and the insertion port 14 are the same. Accordingly, the same reference numerals as those shown in FIGS. 3 and 4 are attached to these portions, and detailed description thereof will be omitted.
[0019]
1 and 2, reference numeral 31 denotes a metal propulsive force transmission member, which has a rectangular cross section and is divided into two parts in the circumferential direction. 32 and 32 are the division parts. In each divided portion 32, radially outward projecting portions 33, 33 are formed at circumferential ends of the propulsive force transmitting member 31, and these projecting portions 33, 33 are connected by fastening elements 34 such as bolts and nuts. By being fastened together, the propulsive force transmission member 31 is assembled in an annular shape and fastened to the outer periphery of the insertion opening 14. In the dividing portion 32, a rib 35 is provided between the protruding portion 33 and the main body portion of the propulsive force transmitting member 31, and the protruding portions 33 and 33 are configured not to be greatly deformed when fastened by the fastening element 34.
[0020]
On the outer surface of the propulsive force transmitting member 31 at an appropriate position between one divided portion 32 and the other divided portion 32 along the circumferential direction, a protrusion 36 that protrudes in the radial direction is provided by a welding or the like. And is provided integrally. As described above, the projection 36 is such that the receiving port 12 and the insertion port 14 are bent to each other, and even when the bending degree is maximized, the protrusion 36 does not enter the gap between the receiving port 12 and the insertion port 14. It is formed at a height. In the example of FIGS. 1 and 2, the protrusion 31 is constituted by a rectangular plate-like body having a size equal to the width dimension of the propulsive force transmitting member 31 along the tube axis direction.
[0021]
In the example of FIGS. 1 and 2, the two propulsive force transmission members 31, 31 are arranged continuously in the tube axis direction.
According to such a configuration, the propulsive force transmission member 31 has the projection 36 that protrudes in the radial direction in the same manner as the divided portion 32 even at a distance from the divided portion 32 in the circumferential direction. Even if the insertion opening 14 is bent with respect to each other, and the gap between the inner surface of the receiving opening 12 and the outer surface of the insertion opening 14 is increased at a distance from the dividing portion 32 in the circumferential direction, the protrusion 36 corresponding to that portion. Hits the end face 29 of the receiving port 12, and thus the propulsive force transmitting member 31 is prevented from entering the gap between the receiving port 12 and the insertion port 14.
[0022]
Therefore, it is possible to prevent the receiving port 12 and the insertion port 14 from causing the required bending operation during and after the laying of the pipe line, and evenly along the circumferential direction of the pipes 11 and 13 during laying, that is, during propulsion. It is possible to prevent the propulsion force from being transmitted. In addition, there exists an advantage that a big propulsive force can be transmitted by arrange | positioning the two propulsive force transmission members 31 and 31 so that it may continue in a pipe-axis direction as mentioned above.
[0023]
【The invention's effect】
As described above, according to the present invention, the propulsive force transmission member has the first radial projecting portion that can contact the end face of the receiving port at the circumferentially divided portion, and the distance in the circumferential direction from the divided portion. Since the second radial projecting portion that can come into contact with the end face of the receiving opening is provided at the position where the opening is placed, the receiving opening and the insertion opening are bent at this position or in the vicinity thereof, and the inner surface of the receiving opening Even if the clearance between the insertion port and the outer surface of the insertion port becomes large, it is possible to prevent the protrusion from hitting the end surface of the reception port and the propulsive force transmission member from entering the clearance between the reception port and the insertion port. It is possible to prevent the receiving port and the insertion port from causing the required bending operation later, and to prevent the transmission of the propulsive force evenly along the circumferential direction of the pipe during laying, that is, during propulsion.
[Brief description of the drawings]
FIG. 1 is a front view of a main part of a propulsion pipe having an earthquake resistance function according to an embodiment of the present invention.
FIG. 2 is a view showing a propulsive force transmission member in FIG. 1;
FIG. 3 is a cross-sectional view of a main part of a conventional propulsion pipe having an earthquake resistance function.
4 is an overall side view of the portion shown in FIG. 3. FIG.
[Explanation of symbols]
12 Receiving port 14 Inserting port 29 End surface 31 Propulsive force transmitting member 32 Dividing part 33 Protruding part 34 Fastening element 36 Protrusion

Claims (1)

The insertion port formed at the end of the other pipe is inserted into the receiving port formed at the end of one of the pipes joined together, and the propulsive force is transmitted between the receiving port and the insertion port. The propulsion pipe is configured to have a seismic structure that is provided with an anti-detachment function and an expansion / contraction function between the receiving port and the insertion port, and the insertion port on the outside of the reception port An annular propulsion force transmission member divided into an appropriate number along the circumferential direction is fastened to the outer periphery of the pipe, and the propulsion force transmission member is brought into contact with the end face of the receiving port while being fastened to the receiving port. The propulsive force at the time of laying is configured to be transmitted between the receiving port and the insertion port, and when a large force acts between the receiving port and the insertion port, this force causes a slip between the insertion port and the insertion port. And the insertion port is allowed to enter the interior of the receiving port farther than when propulsion is transmitted, and the thrust is The force transmission member has a first radial projecting portion that can contact the end surface of the receiving port at the circumferentially divided portion, and the end surface of the receiving port at a position spaced from the divided portion in the circumferential direction. A propulsion pipe having an earthquake-proof function, characterized in that it has a second radial protrusion that can come into contact with.

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