JP2021046775A - Propulsion power transmission device for propulsion laying method - Google Patents

Abstract

To solve a problem in which, on a propulsion transmission device that is used for a pipe connection part in a propulsion laying method and transmits propulsion power of a succeeding pipe to a preceding pipe, the propulsion power cannot be effectively transmitted since a part of pieces of plural propulsion power transmission means does not abut to a socket of the preceding pipe when continuous new pipes are propelled bending at a connection part due to a bent propulsion pipe path.SOLUTION: Each of a plurality of pieces of propulsion power transmission means is provided with a deformation part deforming when propulsion power is beyond a predefined power.SELECTED DRAWING: Figure 3

Description

In the present invention, the pipes joined by fitting the insertion port of the trailing pipe into the receiving port of the leading pipe are sequentially pushed into the sheath pipe laid in the ground in advance, and the new pipe is laid in the sheath pipe. In the type of propulsion laying method, the present invention relates to a propulsion force transmission device for the propulsion laying method, which is fixed to the outer peripheral surface of the insertion port and transmits the propulsive force (pushing force) of the trailing pipe to the preceding pipe.

In recent years, there have been few problems such as traffic obstacles due to road construction and disposal of excavated soil, and a pipe-type propulsion laying method has been implemented that allows pipes to be laid even in places where excavation work cannot be performed, such as under tracks. There is.

Patent Document 1 discloses an example of a propulsion force transmission device used in a sheath pipe type propulsion laying method. Hereinafter, this propulsion force transmission device will be referred to as a conventional propulsion force transmission device.

In the conventional propulsion transmission device, the opening end of the receiving port is used to insert the insertion port into the receiving port while leaving a pushing space (contraction allowance) between the tip of the insertion port of the trailing tube and the inner end of the receiving port of the preceding tube. A band member attached to the outer surface of the insertion port separated by a length corresponding to the space for pushing in, a thrust transmission member extending from the band member toward the opening end of the receiving port, and a thrust transmitting member whose tip engages with the opening end of the receiving port, and a band member. A guide member that is radially supported on the outer surface and slides or rolls along the inner surface of the sheath pipe, and the strength of the thrust transmission member that engages with the opening end of the socket can withstand the propulsive force of the pipe, but in the event of an earthquake. It is said to be strong enough to be destroyed by a large external force.

Japanese Patent No. 3916411

As shown in FIG. 3 of Patent Document 1, the conventional propulsion force transmission device has a structure in which a plurality of thrust transmission members are hung from the outer peripheral side of the receiving end surface of the preceding pipe. Therefore, when the propulsion pipeline formed by the sheath pipe is bent and the pipe shaft of the continuous new pipe is bent at the connecting portion to be propelled in the sheath pipe, a part of the thrust transmission member (for example, propulsion) is used. If the pipeline is bent to the left, the thrust transmission member on the right side will be disengaged, and the remaining thrust transmission member (for example, if the propulsion pipeline is bent to the left) will be on the left side. Propulsion is performed only by the thrust transmission member), and if the number of continuous new pipes is large and the total weight thereof is large, the propulsion distance of the new pipes that can be laid may be shortened.

Therefore, the present invention has a structure in which the propulsive force transmitting means can follow the receiving port of the preceding pipe even when the propulsion pipeline is bent and the continuous new pipe is bent and propelled at the connecting portion. It is an object of the present invention to provide a propulsion force transmission device for a propulsion laying method capable of stably transmitting a propulsion force to a receiving port of a leading pipe.

The present invention has been made to achieve the above object, and is characterized by the following.

The invention according to claim 1 is a propulsion laying method in which pipes joined by fitting an insertion port of a trailing pipe into a receiving port of a leading pipe are sequentially pushed into a sheath pipe to lay a new pipe in the sheath pipe. A propulsion force transmission device for the propulsion laying method used by the above, including a ring-shaped band attached to the outer peripheral surface of the insertion port, and the band transmits the pushing force of the trailing pipe to the leading pipe. It has a plurality of propulsive force transmitting means, and each of the plurality of propulsive force transmitting means has a deformed portion that is deformed when the pushing force exceeds a predetermined force.

The invention according to claim 2 is the propulsion force transmission device for the propulsion laying method according to claim 1, wherein the leading pipe and the trailing pipe are located between the tip of the insertion port and the back end of the receiving port. The band is joined at a predetermined distance, and the band is attached at a position where the distance between the end face of the socket and the end face of the band on the socket side is less than the predetermined distance, and the attachment strength of the band to the insertion port is Is characterized by its strength to withstand the pushing force but to slide with a large force at the time of an earthquake.

The invention according to claim 3 is the propulsion force transmission device for the propulsion laying method according to claim 1 or 2, wherein the propulsion force transmission means extends in the direction of the end face of the socket, and the tip thereof extends toward the end face of the socket. It is characterized by having a propulsive force transmitting member that abuts on the end face.

The invention according to claim 4 is the propulsion force transmission device for the propulsion laying method according to claim 3, wherein the propulsion force transmission means has a bracket fixed to the band and the following in the sheath pipe. The propulsion force transmitting member has a support member for supporting the pipe and a fixed shaft having one end attached to the bracket for fixing the support member to the bracket, and the propulsive force transmission member has a long length in the axial direction of the band. A hole is formed, the fixed shaft is fixed to one end of the elongated hole, and a partition wall for partitioning the elongated hole is formed, and the other end of the fixed shaft cannot escape to one end of the elongated hole. The partition wall is inserted into the and functions as the deformed portion.

The invention according to claim 5 is the propulsion force transmission device for the propulsion laying method according to claim 4, wherein the support member includes wheels.

The invention according to claim 6 is the propulsion force transmission device for the propulsion laying method according to any one of claims 3 to 5, wherein the tip end portion of the propulsion force transmission member is the end surface of the socket. It is characterized by being bent so as to abut.

The invention according to claim 7 is the propulsion force transmission device for the propulsion laying method according to claim 6, wherein the outside of the bent portion which is a bent portion of the propulsion force transmission member is formed in an arc shape. The bent portion is characterized by having a contact portion that comes into contact with the end face of the receiving port.

The invention according to claim 8 is the propulsion force transmission device for the propulsion laying method according to claim 7, wherein the tip portion of the propulsion force transmission member bent so as to come into contact with the end face of the socket is described above. It has a flat surface portion that comes into contact with the end face of the socket, and both the flat surface portion and the contact portion come into contact with the end face of the socket.

The invention according to claim 9 is the propulsion force transmission device for the propulsion laying method according to claim 6, wherein the outside of the bent portion which is a bent portion of the propulsion force transmission member is formed in an arc shape. It is characterized in that a contact plate is provided on a surface of the bent portion and a portion of the portion on the side of the bent portion that comes into contact with the end surface of the receiving port.

The invention according to claim 10 is the propulsion force transmission device for the propulsion laying method according to claim 6, wherein the outside of the bent portion, which is a bent portion of the propulsion force transmission member, is formed at a right angle. It is characterized by.

The invention according to claim 11 is the propulsion force transmission device for the propulsion laying method according to any one of claims 1 to 10, wherein the band is a bolt passed between the ends of the band. , It is characterized in that it is attached to the outer peripheral surface of the insertion port by a nut screwed into the bolt.

The invention according to claim 12 is the propulsion force transmission device for the propulsion laying method according to any one of claims 1 to 11, wherein at least a part of the inner peripheral surface of the band has the inner circumference. It is characterized in that a frictional force improving portion is formed in which the frictional force with the contact surface of the insertion port is higher than that of other portions on the surface.

The invention according to claim 13 is the propulsion force transmission device for the propulsion laying method according to claim 12, characterized in that a protrusion is formed on the frictional force improving portion.

According to the present invention, when the propulsion pipeline is bent and a continuous new pipe is bent and propelled at the connecting portion, the thrust transmission means located at the position opposite to the bending direction is likely to be disengaged. Even in such a case, the deformed part is deformed by applying a pushing force exceeding a predetermined force to the deformed part of the propulsive force transmitting means located in the bending direction, and the propulsive force transmitting means is sent to the receiving port of the preceding pipe. Since the abutment is made so as to follow, the propulsive force transmitting means can stably transmit the propulsive force to the receiving port of the preceding pipe.

It is a partial cross-sectional perspective view which shows the pipe joint part which attached the propulsion force transmission device for the propulsion laying method which concerns on this embodiment. It is another partial cross-sectional perspective view which shows the pipe joint part which attached the propulsion force transmission device for the propulsion laying method which concerns on this embodiment. It is sectional drawing which shows the pipe joint part which attached the propulsion force transmission device for the propulsion laying method which concerns on this embodiment. It is a perspective view which shows the propulsion force transmission device for the propulsion laying method which concerns on this embodiment. It is a perspective view which shows the propulsion force transmission member of the propulsion force transmission device for the propulsion laying method which concerns on this embodiment. It is the enlarged partial perspective view of the claw part of the propulsion force transmission device for the propulsion laying method which concerns on this embodiment. It is a perspective view which shows the pipe joint part which attached the propulsion force transmission device for the propulsion laying method which concerns on this embodiment in a sheath pipe. It is a top view which shows the check gauge. (A) to (D) are state transition diagrams of the pipe joint portion equipped with the propulsion force transmission device for the propulsion laying method according to the present embodiment. It is a perspective view which shows the propulsion force transmission device for a propulsion laying method different from the propulsion force transmission device for a propulsion laying method which concerns on this embodiment. (A) is a partial plan view showing how the propulsive force transmitting member according to the present embodiment comes into contact with the end surface of the receiving port of the preceding pipe, and (B) is a portion showing how the propulsive force transmitting member according to the present embodiment bends. It is a plan view. It is a perspective view (the perspective view from the tip side) which shows the propulsion force transmission member different from the propulsion force transmission member which concerns on this embodiment. It is a perspective view (the perspective view from the rear end side) which shows the propulsion force transmission member different from the propulsion force transmission member which concerns on this embodiment. It is a partial plan view which shows the propulsion force transmission member different from the propulsion force transmission member which concerns on this embodiment. It is a side view before bending of the tip part of the propulsion force transmission member different from the propulsion force transmission member which concerns on this embodiment. It is a perspective view (perspective view from the tip end side) before bending of the tip portion of the propulsion force transmission member different from the propulsion force transmission member which concerns on this embodiment. It is a perspective view (perspective view from the tip end side) which shows the propulsion force transmission member which is further different from the propulsion force transmission member which concerns on this embodiment. It is a partial plan view which shows the propulsion force transmission member which is further different from the propulsion force transmission member which concerns on this embodiment. It is a perspective view (perspective view from the tip side) which shows the other propulsion force transmission member. It is a partial plan view which shows the other propulsion force transmission member.

Next, an embodiment of the propulsion force transmission device for the propulsion laying method of the present invention will be described with reference to the drawings.

As shown in FIGS. 1 to 7, the propulsion force transmission device 11 for the propulsion laying method (hereinafter referred to as “propulsion force transmission device 11”) according to the present embodiment is provided on the outer peripheral surface of the insertion port 3 of the trailing pipe 5. A ring-shaped tightening means 12 to be mounted and a plurality of (three in the present embodiment) propulsive force transmitting means 13 arranged at intervals along the outer peripheral surface of the insertion port 3 are provided.

The tightening means 12 includes one band 14, a bolt 15 and a nut 16 as a tightening tool for tightening the band 14. The bolt 15 is passed through both ends of the band 14, and the band 14 is tightened by tightening the nut 16 screwed into the bolt 15. The tightening means 12 may have a plurality of bands 14 connected to each other in a ring shape by bolts 15 and nuts 16 as tightening tools.

The propulsion force transmitting means 13 includes a propulsion force transmitting member 17, a bracket 18, a wheel 20, a fixed shaft 21, and a fixed shaft holding member 25.

The propulsion force transmission member 17 comes into contact with the end surface 1a of the receiving port 1 of the leading pipe 2 and transmits the propulsive force (pushing force) of the trailing pipe 5 to the leading pipe 2. The tip of the propulsion force transmitting member 17 is bent so as to come into contact with the end surface 1a of the receiving port 1.

The bracket 18 is provided on the outer peripheral surface of the band 14.

The wheel 20 functions as a support member for supporting the trailing pipe 5 in the sheath pipe 19 as a propulsion pipe.

The fixed shaft 21 is made of a bolt, and has an insertion hole (not shown) formed in the bracket 18, a shaft hole (not shown) of the wheel 20, an elongated hole 17a formed in the propulsive force transmission member 17, and a fixed shaft holding member. The insertion holes (not shown) formed in 25 are inserted in this order, and are screwed and fixed to the nut 22. In other words, one end of the fixed shaft 21 is attached to the bracket 18, and the wheel 20 is rotatably fixed in the bracket 18, and the other end of the fixed shaft 21 is an elongated hole 17a formed in the propulsive force transmitting member 17. It is fixed to one end (see FIG. 3) so that it cannot be pulled out.

As shown in FIG. 5, the elongated hole 17a through which the other end of the fixed shaft 21 is passed is partitioned into two by the partition wall 23, and the other end of the fixed shaft 21 is held by one of the elongated holes 17a. It is fixed to one end of 17a. The partition wall 23 is deformed when the pushing force exceeds a predetermined force. The partition wall 23 may be formed integrally with the propulsion force transmitting member 17, or may be a separate body.

As shown in FIG. 3, the insertion port 3 of the trailing pipe 5 is formed with a retaining protrusion 4 at the tip thereof. Further, the lock ring 6 is fitted into the lock ring groove 7 formed on the inner peripheral surface of the receiving port 1 via the centering ring 8, and the rubber ring formed on the inner peripheral surface of the receiving port 1 is fitted. A rubber ring 9 is fitted in the groove 10.

As shown in FIG. 4, the lower end of the fixed shaft holding member 25 is formed with a stepped notch, and the notch is fixed at a position where the end face 14a of the band 14 and the claw 18a of the bracket 18 are engaged with each other. .. As a result, since the fixed shaft holding member 25 does not shift backward, it is possible to prevent the wheels and the fixed shaft from becoming slanted during propulsion, and to maintain a stable propulsion posture.

As shown in FIG. 6, a claw portion 24 is formed on the inner peripheral surface of the band 14 in the vicinity of a portion where the band 14 is tightened by the bolt 15 and the nut 16. The claw portion 24 is formed so that the frictional force with the contact surface of the insertion port 3 is higher than that of other portions on the inner peripheral surface of the band 14.

Next, a propulsion laying method using the propulsion force transmission device 11 of the present invention will be described.

In order to join a new pipe by the propulsion laying method using the propulsion force transmission device 11 of the present invention, the propulsion force transmission device 11 is fixed to the insertion port 3 of the trailing pipe 5 on the ground. That is, the band 14 of the tightening means 12 is tightened by the bolt 15 and the nut 16, and the propulsive force transmission device 11 is fixed to the insertion port 3.

The fixed position of the propulsion force transmitting device 11 is a position where the pipe joint between the leading pipe 2 and the trailing pipe 5 can be expanded and contracted when the insertion port 3 is fitted into the receiving port 1, and the propulsive force transmitting means 13 The tip of the socket 1 is in contact with the end surface 1a of the socket 1.

After fixing the propulsion force transmission device 11 to the insertion port 3 of the trailing pipe 5 on the ground, the trailing pipe 5 is hung underground (starting shaft) and fitted into the receiving port 1 of the leading pipe 2. As a result, as shown in FIG. 3, the leading pipe 2 and the trailing pipe 5 are joined in a state where the contraction allowance T1 and the extension allowance T2 are maintained at the pipe joint portion. The contraction allowance T1 corresponds to the distance between the tip of the insertion port 3 and the inner end of the receiving port 1, and the extension allowance T2 corresponds to the distance between the lock ring 6 and the retaining protrusion 4. By joining the pipes with the contraction allowance T1 and the extension allowance T2 in this way, the pipe joint expands and contracts even when an excessive pushing force or pulling force acts on the pipe joint due to an earthquake or the like. , The damage of the pipe can be prevented.

After joining the leading pipe 2 and the trailing pipe 5, a check gauge G (see FIG. 8) is inserted into the receiving port 1 through the gap between the band 14 and the end surface 1a of the receiving port 1, and the rubber ring 9 is correct. Determine if it is in position.

In this way, the check gauge G can be inserted all around the receiving port 1 until it reaches the rubber ring 9, so that the check gauge 48 can reliably confirm the fitted state of the rubber ring 9.

The band 14 is attached at a position where the attachment distance T3 between the band 14 and the end surface 1a of the receiving port 1 is less than the contraction allowance T1.

Next, when the trailing pipe 5 is pushed into the propulsion pipeline formed by the sheath pipe 19 using a hydraulic jack or the like, the propulsion force transmitting means 13 transmits the pushing force to the leading pipe 2, and the trailing pipe 5 The leading pipe 2 and the pipe beyond it are pushed into the depth of the propulsion pipeline.

In this way, since the propulsion force transmission device 11 can be mounted on the ground, the propulsion force transmission device 11 mounting work and the underground fitting work of the insertion port 3 into the receiving port 1 can be performed separately. As a result, since the propulsion force transmission device 11 can be attached to the insertion port 3 of the plurality of trailing pipes 5 on the ground, the total work time required for pipe joining is shortened. In particular, the work time performed underground is greatly reduced.

Further, the installation work of the propulsion force transmission device 11 in the basement takes time because the work space is narrow, but since the installation work of the propulsion force transmission device 11 can be performed on the ground, the insertion port 3 to the socket 1 is underground. Only the fitting work and the confirmation work with the check gauge G are required. As a result, the total work time required for pipe joining is shortened. In particular, the work time performed underground is greatly reduced.

According to the propulsion laying method using the propulsion force transmission device 11 of the present invention, the pushing force of the trailing pipe 5 when laying a new pipe in the sheath pipe 19 is tightened to the insertion port 3 of the trailing pipe 5. It can be transmitted to the leading pipe 2 by the propulsion force transmitting member 17 attached via the means 12. That is, as shown in FIG. 1, when the propulsive force transmitting member 17 comes into contact with the end surface 1a of the receiving port 1, the pushing force can be transmitted to the leading pipe 2.

Next, the change in the degree of deformation of the partition wall 23 of the propulsion force transmitting member 17 will be described with reference to FIG.

FIG. 9A shows an initial state in which the pushing force is zero. When the pushing force gradually increases from this initial state and exceeds a predetermined force, the partition wall 23 is in the initial deformed state as shown in FIG. 9B. Then, the contraction allowance T1 and the attachment distance T3 are shortened by the amount of the deformation of the partition wall 23, and the extension allowance T2 is lengthened. The length at which the propulsive force transmitting member 17 slides due to the deformation (or breakage) of the partition wall 23 corresponds to the slide length T4.

Then, when the pushing force is further increased, the partition wall 23 is in a completely deformed state as shown in FIG. 9C. Then, the shrinkage allowance T1 and the mounting distance T3 become shorter, the extension allowance T2 becomes longer, and the slide length T4 becomes zero by the amount that the partition wall 23 is further deformed. The partition wall 23 may be stretched and deformed as shown in FIG. 9C, or may be broken.

Next, when the pushing force further increases from the state of FIG. 9 (C), the partition wall 23 remains in the completely deformed state shown in FIG. 9 (C), and the band 14 is attached to the insertion port 3 of the trailing pipe 5. slide. In this case, the contraction allowance T1 becomes shorter and the extension allowance T2 becomes longer. Since the mounting distance T3 slides backward from the position where the band 14 is initially mounted, it does not change from the state shown in FIG. 9C.

By the way, in the present embodiment, the attachment strength of the band 14 to the insertion port 3 is a strength that can withstand the pushing force but slides with a large force at the time of an earthquake. Here, withstanding the pushing force does not mean that the band 14 does not slip at all when the new pipe is propelled by the pushing force of the hydraulic jack or the like, but the number of new pipes increases. This means that the band 14 slips within a range in which the contraction allowance T1 is not set to zero when the pushing force due to the hydraulic jack or the like increases.

Further, when an excessive pushing force is applied to the propulsion force transmitting device 11 due to an earthquake or the like, the partition wall 23 is completely deformed (or broken), and then the band 14 slips, and as shown in FIG. 9D, the contraction allowance. T1 becomes zero. At this time, since a frictional force acts between the inner surface of the band 14 and the outer surface of the insertion port 3, the band 14 does not slide at once but gradually slides, thereby reducing the impact when absorbing the contraction allowance T1 (like a cushion). Can play a role). In the conventional propulsion force transmission device, the band member is attached at a position separated from the opening end of the receiving port on the outer surface of the insertion port by a length corresponding to the pushing space or more, so that the pushing force at the time of propulsion is excessive. When a large force (force due to an earthquake or the like) is applied, the trailing pipe is pushed forward at once (as much as the thrust transmission member endures) after the applied thrust transmission member is damaged, so that the pipe is impacted.

Next, the movement of the propulsion force transmission device 11 at the time of propulsion of the new pipe will be described with respect to the case where the propulsion path is straight and the case where the propulsion path is curved.

First, in the portion where the propulsion pipeline is straight, the continuous new pipe is propelled linearly along the pipe axis direction, so that each of the three propulsion force transmission members 17 comes into contact with the end surface 1a of the receiving port 1 and pushes the force. Is transmitted to the leading pipe 2. That is, since the pushing force is transmitted by the three propulsive force transmitting members 17, the force (load) applied to one propulsive force transmitting member 17 is one-third of the total.

On the other hand, for example, when the propulsion pipeline is bent to the left and a continuous new pipe in the propulsion pipeline is bent to the left at the connecting portion and is propelled, the force applied to the propulsion force transmitting member 17 on the left side is applied. , Larger than the other propulsion force transmitting members 17. Therefore, when only one propulsive force transmitting member 17 comes into contact with the end surface 1a of the receiving port 1, conventionally, all the forces are applied to one propulsive force transmitting member 17 and the thrust is damaged. Therefore, it becomes impossible to receive the pushing force at that part. Therefore, the remaining two will receive a pushing force, and the propulsive distance will be shortened.

However, in the propulsion force transmitting member 17 of the present embodiment, the partition wall 23 is deformed when the pushing force exceeds a predetermined force. Therefore, in this case, the partition wall 23 of the propulsive force transmitting member 17 on the left side is deformed and the mounting distance T3 is shortened, so that the other propulsive force transmitting member 17 comes into contact with the end surface 1a of the receiving port 1, and as a result, The pushing force can be transmitted to the leading pipe 2 by the three propulsive force transmitting members 17. Even when the partition wall 23 is completely deformed as shown in FIG. 9C, the band 14 receives the force applied to the propulsion force transmitting member 17, so that the partition wall 23 is deformed. It is possible to receive the pushing force as before. As a result, when the propulsion pipeline is bent, a larger pushing force can be transmitted than when the pushing force is transmitted by only one propulsion force transmitting member 17, so that a new pipe connected for a longer time can be propelled. Can be made to.

When the three propulsive force transmitting members 17 are in contact with the end surface 1a of the receiving port 1, the partition wall 23 is deformed by the pushing force before the band 14 slips. That is, the load F1 (an example of a "predetermined force") applied to the propulsion force transmission device 11 at the start of deformation of the partition wall 23 is smaller than the load F2 applied to the propulsion force transmission device 11 at the start of sliding of the band 14.

Further, when only one propulsive force transmitting member 17 comes into contact with the end surface 1a of the receiving port 1 and the load is concentrated, the partition wall 23 is deformed with a load lower than the load F1 applied to the propulsive force transmitting device 11 (approximately). Because it takes three times as much load).

As described above, the propulsion force transmission device 11 according to the present embodiment includes a ring-shaped band 14 attached to the outer peripheral surface of the insertion port 3, and the band 14 applies the pushing force of the trailing pipe 5 to the leading pipe 2. Each of the plurality of propulsive force transmitting means 13 has a partition wall 23 (an example of a "deformed portion"), and the partition wall 23 has a pushing force exerting a predetermined force. It deforms when it exceeds.

Therefore, according to the propulsion force transmission device 11 of the present embodiment, when the propulsion pipeline is bent and the continuous new pipe is bent and propelled at the connecting portion, the propulsion force is at a position opposite to the bending direction. Even if the hook of the transmitting means is likely to come off, the partition wall 23 is deformed by applying a pushing force exceeding a predetermined force to the partition wall 23 of the propulsive force transmitting means 13 located in the bending direction. Since the propulsive force transmitting means 13 abuts so as to follow the receiving port 1 of the leading pipe 2, the propulsive force transmitting means 13 can be dispersed and the pushing force can be transmitted to the receiving port 1 of the leading pipe 2. As a result, the new pipe can be propelled while following the propulsion pipeline. As a result, it is possible to push in almost the same number (distance) of new pipes in the straight portion and the curved portion of the propulsion pipeline.

Further, in the propulsion force transmission device 11 according to the present embodiment, the leading pipe 2 and the trailing pipe 5 are joined with a contraction allowance T1 of a predetermined distance between the tip of the insertion port 3 and the back end of the receiving port 1. The propulsive force transmitting means 13 has a propulsive force transmitting member 17 that extends in the direction of the end surface of the receiving port 1 and whose tip abuts on the end surface 1a of the receiving port 1, and the band 14 is the end surface 1a of the receiving port 1 and the receiving port of the band 14. It is mounted at a position where the mounting distance T3, which is the distance between the end faces on the side, is less than the contraction allowance T1, and the mounting strength of the band 14 to the insertion port 3 is such that it can withstand the pushing force but slides with a large force during an earthquake. is there. As a result, even if a large force due to an earthquake or the like is applied to the propulsion force transmission device 11 after the completion of propulsion, the band 14 has a tightening force against the insertion port 3 after the partition wall 23 is completely deformed (or broken). Since it starts to slip after enduring, the impact on the pipe can be reduced.

Further, the propulsion force transmitting device 11 according to the present embodiment has a claw portion on at least a part of the inner peripheral surface of the band 14 so that the frictional force with the contact surface of the insertion port 3 is higher than other parts on the inner peripheral surface. 24 (an example of a "friction force improving portion") is formed. As a result, the tightening force of the band 14 with respect to the insertion port 3 can be improved to make it less slippery, and it is possible to absorb variations in the mounting strength of the band 14 with respect to the insertion port 3 by the installer.

Next, a modified example of the propulsion force transmitting device 11 will be described with reference to FIG. The major difference from the propulsion force transmission device 11 in the above-described embodiment is that the length of the propulsion force transmission member 17 in the pipe axis direction and the slide length T4 are longer. In the propulsion force transmitting device 11 according to this modified example, the partition wall 23 is formed so as to be deformed (or broken) more greatly than that of the above-described embodiment. As a result, the margin until the partition wall 23 is completely deformed during propulsion becomes large, so even if the curve of the propulsion pipeline is tight, the pushing force is stably transferred to the leading pipe by the deformation of the propulsion force transmitting member 17. It becomes possible to transmit. As described above, the design value of the slide length T4 can be appropriately set while the mounting distance T3 is secured.

By the way, as shown in FIG. 11A, when the propulsive force transmission member 17 and the end surface 1a of the receiving port 1 come into contact with each other, there are a large number of new pipes to be propelled in the propulsion pipeline, or the diameter of the new pipe is large. When the force is large, the weight of the new pipe to be propelled increases, and the force acting between the propulsion force transmitting member 17 and the end face 1a increases. Therefore, it is necessary to improve the partition wall 23 to a strength that can cope with the force. There is. On the other hand, when the strength of the partition wall 23 is improved, before the partition wall 23 is deformed (or broken), as shown in FIG. 11B, at the bent portion of the propulsion force transmitting member 17. There is a possibility that the portion between the bent portion 17b and the elongated hole 17a of the main body portion (the portion where the partition wall 23 and the elongated hole 17a are formed), which is a portion in front of the bent portion 17b, is bent. In particular, in the case of the propulsion force transmission member 17 having a long length in the pipe axis direction as in the propulsion force transmission member 17 of the propulsion force transmission device 11 shown in FIG. 10, the possibility of bending is high. This is because, when the pushing force is transmitted to the leading pipe 2, when the outer side of the bent portion 17b is formed in an arc shape as shown in FIG. 11 (A), the bent portion 17b does not come into contact with the end surface 1a. Therefore, the force F acting in the end face 1a direction (perpendicular to the end face 1a) (which does not come into contact with the arc shape) is on the pipe axial straight line (single point chain line L) of the main body of the propulsion force transmission member 17. A large force F acting in the direction of the end surface 1a acts on the tip side contact portion 17d that abuts on the end surface 1a ahead of the bending portion 17b, and the force F gradually acts along the arc shape on the outside of the bending portion 17b. It happens because the place where the action works changes.

Therefore, as shown in FIGS. 12 and 13, a propulsion force transmission member 17 different from the propulsion force transmission member 17 according to the present embodiment may be adopted. Another propulsive force transmitting member 17 is a contact portion for receiving a force F (a force from a direction perpendicular to the end face 1a) acting on the bent portion 17b with the end face 1a when abutting with the end face 1a. It has 17c. As a result, as shown in FIG. 14, the bending portion 17b can also receive the force acting in the end face 1a direction on the pipe axial straight line (dotted chain line L) of the main body portion of the propulsion force transmission member 17, which is large. Even when a pushing force is applied, it is possible to prevent the partition wall 23 from bending at the main body portion in front of the bent portion 17b before the partition wall 23 is deformed (or broken).

Here, a method of creating another propulsive force transmitting member 17 shown in FIGS. 12 and 13 will be described. First, as shown in FIGS. 15 and 16, the propulsion force transmission member 17 before the tip is bent is cut out from the plate-shaped body which is the material of the propulsion force transmission member 17. Further, the cut hole 17e is formed so that the contact portion 17c is formed when the tip portion of the propulsion force transmission member 17 is bent. Then, by bending the tip end portion of the propulsion force transmission member 17, the propulsion force transmission member 17 having the contact portion 17c is created.

Further, as shown in FIG. 17, another propulsive force transmission member 17 may be adopted. Yet another propulsive force transmitting member 17 has an end face on the contact surface between the bent portion 17b formed in an arc shape on the outside and the end surface 1a of the portion ahead of the bent portion 17b. A contact plate 17f that receives a force acting in the 1a direction (a force from the direction perpendicular to the end face 1a) is provided. The abutting plate 17f can be attached to the propulsion force transmitting member 17 by, for example, welding. According to the propulsion force transmitting member 17 shown in FIG. 17, as shown in FIG. 18, the force acting on the bent portion 17b in the direction of the end face 1a is applied to the main body portion of the propulsion force transmitting member 17 via the contact plate 17f. Since it can be received on a straight line in the pipe axis direction (one-point chain line L), the place where the force F acts does not gradually change along the arc shape on the outside of the bent portion 17b, and a large pushing force is applied. However, before the partition wall 23 is deformed (or broken), it is possible to prevent the partition wall 23 from bending at the main body portion in front of the bent portion 17b.

The propulsive force transmitting member 17, another propulsive force transmitting member 17, and yet another propulsive force transmitting member 17 according to the present embodiment form a bent portion 17b having an arc shape on the outside by sheet metal bending processing. As shown in FIG. 20, another propulsive force transmitting member 17 in which the outside of the bent portion 17b is formed at a right angle may be adopted. In this case, the bent portion 17b is formed by casting, cutting, or the like. According to the other propulsion force transmitting member 17, a force acting in the end face 1a direction can be received on the pipe axial direction straight line (single point chain line L) of the main body of the propulsion force transmitting member 17, so that a large pushing force is applied. Even in this case, it is possible to prevent the partition wall 23 from bending at the main body portion in front of the bent portion 17b before the partition wall 23 is deformed (or broken).

1: Receptacle 1a: End face 2: Leading pipe 3: Insertion port 4: Retaining protrusion 5: Trailing pipe 6: Lock ring 7: Lock ring groove 8: Centering ring 9: Rubber ring 10: For rubber ring Groove 11: Propulsion force transmission device of the present invention 12: Tightening means 13: Propulsion force transmission means 14: Band 15: Bolt 16: Nut 17: Propulsion force transmission member 17a: Long hole 17b: Bending part 17c: Contact part 17d: Tip side contact part 17e: Notch hole 17f: Contact plate 18: Bracket 19: Sheath pipe 20: Wheel 21: Fixed shaft 22: Nut 23: Partition wall 24: Claw part 25: Fixed shaft holding member G: Check gauge T1: Shrinkage allowance T2: Extension allowance T3: Mounting distance T4: Slide length

Claims (13)

Propulsion for the propulsion laying method used by the propulsion laying method in which the pipes joined by fitting the insertion port of the trailing pipe into the receiving port of the leading pipe are sequentially pushed into the sheath pipe and the new pipe is laid in the sheath pipe. It is a force transmission device
Includes a ring-shaped band attached to the outer peripheral surface of the insertion slot.
The band has a plurality of propulsive force transmitting means for transmitting the pushing force of the trailing pipe to the leading pipe.
A propulsion force transmission device for a propulsion laying method, wherein each of the plurality of propulsion force transmission means has a deformed portion that deforms when the pushing force exceeds a predetermined force. The propulsion force transmission device for the propulsion laying method according to claim 1.
The leading pipe and the trailing pipe are joined at a predetermined distance between the tip of the insertion port and the back end of the receiving port.
The band is attached at a position where the distance between the end face of the receiving port and the end surface of the receiving port side of the band is less than the predetermined distance.
A propulsion force transmission device for a propulsion laying method, characterized in that the attachment strength of the band to the insertion port is a strength that can withstand the pushing force but slides with a large force at the time of an earthquake. The propulsion force transmission device for the propulsion laying method according to claim 1 or 2.
The propulsion force transmitting means for a propulsion laying method is characterized in that the propulsion force transmitting means extends in the direction of the end surface of the receiving port and has a propulsion force transmitting member whose tip abuts on the end surface of the receiving port. The propulsion force transmission device for the propulsion laying method according to claim 3.
The propulsive force transmitting means
With the bracket fixed to the band,
A support member that supports the trailing pipe in the sheath pipe, and
A fixed shaft having one end attached to the bracket, which fixes the support member to the bracket,
Have,
The propulsion force transmitting member is formed with elongated holes long in the axial direction of the band.
In the elongated hole, the fixed shaft is fixed to one end thereof, and a partition wall for partitioning the elongated hole is formed.
The other end of the fixed shaft is inserted into one end of the elongated hole so as not to come out.
A propulsion force transmission device for a propulsion laying method, wherein the partition wall functions as the deformed portion. The propulsion force transmission device for the propulsion laying method according to claim 4.
The support member is a propulsion force transmission device for a propulsion laying method, characterized in that it is composed of wheels. The propulsion force transmission device for the propulsion laying method according to any one of claims 3 to 5.
A propulsion force transmission device for a propulsion laying method, wherein the tip end portion of the propulsion force transmission member is bent so as to come into contact with the end face of the socket. The propulsion force transmission device for the propulsion laying method according to claim 6.
The propulsion laying member is characterized in that the outside of a bent portion, which is a bent portion, is formed in an arc shape, and the bent portion has an abutting portion that abuts on the end surface of the receiving port. Propulsion transmission device for construction methods. The propulsion force transmission device for the propulsion laying method according to claim 7.
The tip end portion of the propulsion force transmitting member that is bent so as to abut the end face of the socket has a flat surface portion that abuts the end face of the socket.
A propulsion force transmission device for a propulsion laying method, characterized in that both the flat surface portion and the contact portion abut on the end surface of the receiving port. The propulsion force transmission device for the propulsion laying method according to claim 6.
In the propulsion force transmitting member, the outside of the bent portion, which is a bent portion, is formed in an arc shape, and the bent portion and the surface of the portion ahead of the bent portion that abuts with the end surface of the receiving port are formed. A propulsion force transmission device for a propulsion laying method, characterized in that a contact plate is provided. The propulsion force transmission device for the propulsion laying method according to claim 6.
A propulsion force transmission device for a propulsion laying method, characterized in that the outside of a bent portion, which is a bent portion of the propulsion force transmission member, is formed at a right angle. The propulsion force transmission device for the propulsion laying method according to any one of claims 1 to 10.
The band is a propulsion force transmission device for a propulsion laying method, characterized in that the band is attached to the outer peripheral surface of the insertion port by a bolt passed between the ends of the band and a nut screwed into the bolt. The propulsion force transmission device for the propulsion laying method according to any one of claims 1 to 11.
At least a part of the inner peripheral surface of the band is formed with a frictional force improving portion that increases the frictional force with the contact surface of the insertion port as compared with other portions on the inner peripheral surface. Propulsion force transmission device for propulsion laying method. The propulsion force transmission device for the propulsion laying method according to claim 12.
A propulsion force transmission device for a propulsion laying method, characterized in that protrusions are formed on the frictional force improving portion.

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