JP7397702B2 - Propulsion force transmission device for propulsion laying method - Google Patents

Description

This invention is a sheath pipe in which the pipes joined by fitting the socket of the trailing pipe into the socket of the leading pipe are successively pushed into a sheath pipe that has been laid underground in advance, and a new pipe is laid inside the sheath pipe. This 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 leading pipe.

In recent years, the sheath tube type propulsion laying method has been implemented, which has fewer problems such as traffic disturbances due to road construction and disposal of excavated soil, and which allows pipes to be laid even in places where cut-and-cover work cannot be done, such as under tracks. There is.

An example of a propulsion force transmission device used in the sheath type propulsion laying method is disclosed in Patent Document 1. Hereinafter, this propulsion force transmission device will be referred to as a conventional propulsion force transmission device.

Conventional propulsion transmission devices have been designed to insert the socket into the socket while leaving a space for pushing (contraction allowance) between the tip of the socket of the trailing pipe and the back end of the socket of the leading pipe. A band member attached to the outer surface of the socket separated by a length corresponding to the pushing space or more from the band member, a thrust transmitting member extending from the band member toward the opening end of the socket and having a tip engaged with the opening end of the socket, and a band member. It has a guide member that protrudes in the radial direction on the outer surface and slides or rolls along the inner surface of the sheath tube. It is said to be strong enough to be destroyed by large external forces.

Patent No. 3916411

As shown in FIG. 3 of Patent Document 1, the conventional propulsion transmission device has a structure in which a plurality of thrust transmission members hang from the outer circumferential side of the socket end face of the leading pipe. For this reason, if the propulsion pipe line formed by the sheath pipe is curved, and the pipe axis of consecutive new pipes is bent at the connecting part and propelled inside the sheath pipe, some of the thrust transmission members (for example, the propulsion pipe) 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, the thrust transmission member on the left side) will be disengaged. If the number of consecutive new pipes is large and their total weight becomes large, the propulsion distance of the new pipes that can be laid may be shortened.

Therefore, the present invention provides a structure in which the propulsion force transmission means can follow the socket of the preceding pipe even if the propulsion pipe is bent and the successive newly installed pipes are bent and propelled at the connecting part. It is an object of the present invention to provide a propulsion force transmission device for a propulsion laying method that can stably transmit propulsion force to a socket of a leading pipe.

This invention has been made to achieve the above object, and has the following features.

The invention according to claim 1 provides a propulsion construction method in which the pipes joined by fitting the socket of the trailing pipe into the socket of the leading pipe are sequentially pushed into the sheath pipe, and the newly installed pipe is laid inside the sheath pipe. A propulsion force transmission device for a propulsion laying construction method used in a plurality of propulsive force transmitting means , each of the propulsive force transmitting means having a propulsive force transmitting member extending in the direction of the end surface of the receptacle and having a tip thereof abutting the end surface of the receptacle, and a propulsive force transmitting member fixed to the band. a supporting member that supports the trailing pipe within the sheath pipe; and a fixed shaft having one end attached to the bracket that fixes the supporting member to the bracket, and the propulsive force transmitting member A long hole is formed in the axial direction of the band, and the fixed shaft is fixed to one end of the long hole, a partition wall is formed to partition the long hole, and the other end of the fixed shaft is fixed to the long hole. is inserted into one end of the elongated hole so as not to come out, and the partition wall deforms 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 arranged between the tip of the insertion port and the back end of the socket. The bands are 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.

The invention according to claim 3 is the propulsion force transmission device for the propulsion laying method according to claim 1 or 2 , characterized in that the support member includes a wheel.
The invention according to claim 4 is the propulsion force transmission device for the propulsion laying method according to claim 3, wherein the fixed shaft serves as an axle for the wheel and rotatably fixes the wheel within a bracket. It is characterized by

The invention according to claim 5 is the propulsion force transmission device for the propulsion laying method according to any one of claims 1 to 4 , wherein the tip of the propulsion force transmission member is in contact with the end surface of the receptacle. It is characterized by being bent so that they touch each other.

The invention according to claim 6 is the propulsion force transmission device for the propulsion laying method according to claim 5 , in which the propulsion force transmission member includes a bent portion that is a bent portion , and a The propulsive force transmitting member has a first abutting portion that abuts the end surface of the receptacle, and when the propulsive force transmitting member is viewed from above, the outer side of the bent portion is formed in an arc shape, and the propulsive force transmitting member It is characterized by having a second abutting part that comes into contact with the end surface of the receptacle at a position that overlaps with the bent part when the receptacle is bent.

The invention according to claim 7 is the propulsion force transmission device for the propulsion laying construction method according to claim 5 , wherein the propulsive force transmission member has an outer side of a bent portion which is a bent portion formed in an arc shape. A contact plate is provided on the bent portion and on a surface that abuts the end surface of the receptacle in a portion beyond the bent portion.

The invention according to claim 8 is the propulsion force transmission device for the propulsion laying construction method according to claim 5 , wherein the outside of the bent portion, which is the bent portion of the propulsion force transmission member, is formed at a right angle. It is characterized by

The invention according to claim 9 is the propulsion force transmission device for the propulsion laying method according to any one of claims 1 to 8 , in which the band includes a bolt passed between end portions of the band. , characterized in that it is attached to the outer circumferential surface of the insertion port by a nut that is screwed onto the bolt.

The invention according to claim 10 is the propulsion force transmission device for the propulsion laying method according to any one of claims 1 to 9 , wherein at least a part of the inner peripheral surface of the band has the inner peripheral surface. The device is characterized in that a frictional force enhancing portion is formed that increases the frictional force with the contact surface of the insertion opening compared to other portions of the surface.

The invention according to claim 11 is the propulsion force transmission device for the propulsion laying method according to claim 10 , characterized in that a protrusion is formed in the frictional force improving portion.

According to this invention, when the propulsion pipe is bent and consecutive newly constructed pipes are bent and propelled at the connecting part, the propulsive force transmission means located in the opposite direction to the bending direction is likely to become disengaged. Even in such a case, when a pushing force exceeding a predetermined force is applied to the deformed part of the propulsive force transmitting means located in the bending direction, the deformed part deforms and the propulsive force transmitting means is inserted into the socket of the leading pipe. Since the propulsive force is in contact with the leading pipe, the propulsive force transmitting means can stably transmit the propulsive force to the socket of the leading pipe.

It is a partial cross-sectional perspective view showing a pipe joint part equipped with a propulsion force transmission device for a propulsion laying method according to the present embodiment. It is another partial cross-sectional perspective view showing the pipe joint part equipped with the propulsion force transmission device for the propulsion laying method according to the present embodiment. FIG. 2 is a cross-sectional view showing a pipe joint portion equipped with a propulsion force transmission device for a propulsion laying method according to the present embodiment. FIG. 1 is a perspective view showing a propulsion force transmission device for a propulsion laying method according to the present embodiment. FIG. 2 is a perspective view showing a propulsive force transmitting member of the propulsive force transmitting device for the propulsion laying method according to the present embodiment. FIG. 2 is a partially enlarged perspective view of the claw portion of the propulsion force transmission device for the propulsion laying method according to the present embodiment. FIG. 2 is a perspective view showing a pipe joint in a sheath pipe, to which the propulsion force transmission device for the propulsion laying method according to the present embodiment is attached. It is a top view showing a check gauge. (A) to (D) are state transition diagrams of a pipe joint equipped with a propulsion force transmission device for a propulsion laying method according to the present embodiment. It is a perspective view showing a propulsion force transmission device for a propulsion laying method different from the propulsion force transmission device for a propulsion laying method according to the present 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 face of the socket of the leading pipe, and (B) is a partial plan view showing how the propulsive force transmitting member according to the present embodiment is bent. FIG. FIG. 3 is a perspective view (perspective view from the distal end side) showing a propulsive force transmitting member different from the propulsive force transmitting member according to the present embodiment. FIG. 3 is a perspective view (perspective view from the rear end side) showing a propulsive force transmitting member different from the propulsive force transmitting member according to the present embodiment. FIG. 3 is a partial plan view showing a propulsive force transmitting member different from the propulsive force transmitting member according to the present embodiment. FIG. 7 is a side view of a propulsive force transmitting member other than the propulsive force transmitting member according to the present embodiment before the distal end thereof is bent. FIG. 3 is a perspective view of a propulsive force transmitting member other than the propulsive force transmitting member according to the present embodiment before the distal end thereof is bent (a perspective view from the distal end side). FIG. 7 is a perspective view (perspective view from the distal end side) showing a propulsive force transmitting member that is further different from the propulsive force transmitting member according to the present embodiment. FIG. 7 is a partial plan view showing a propulsive force transmitting member different from the propulsive force transmitting member according to the present embodiment. FIG. 7 is a perspective view (perspective view from the distal end side) showing another propulsive force transmission member. FIG. 7 is a partial plan view showing another propulsive force transmission member.

Next, embodiments 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 according to the present embodiment (hereinafter referred to as “propulsion force transmission device 11”) is attached to the outer peripheral surface of the insertion port 3 of the trailing pipe 5. It includes a ring-shaped tightening means 12 to be attached, and a plurality of (three in this embodiment) propulsive force transmitting means 13 arranged at intervals along the outer peripheral surface of the insertion port 3.

The tightening means 12 consists of one band 14, and bolts 15 and nuts 16 as tightening tools 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 a nut 16 that is threaded onto the bolt 15. Note that the tightening means 12 may be one in which a plurality of bands 14 are connected to each other in a ring shape using bolts 15 and nuts 16 as tightening tools.

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

The propulsive force transmitting member 17 contacts the end surface 1 a of the socket 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 propulsive force transmitting member 17 is bent so as to come into contact with the end surface 1a of the socket 1.

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

The wheels 20 function as a support member that supports the trailing pipe 5 within the sheath pipe 19 as a propulsion pipe.

The fixed shaft 21 is made of a bolt, and includes an insertion hole (not shown) formed in the bracket 18, a shaft hole (not shown) in the wheel 20, a long hole 17a formed in the propulsive force transmission member 17, and a fixed shaft holding member. 25 through insertion holes (not shown), and are screwed and fixed with nuts 22. In other words, one end of the fixed shaft 21 is attached to the bracket 18 to rotatably fix the wheel 20 within the bracket 18, and the other end of the fixed shaft 21 is attached to the elongated hole 17a formed in the propulsive force transmission member 17. It is fixed to one end (see FIG. 3) so that it cannot be removed.

As shown in FIG. 5, the elongated hole 17a through which the other end of the fixed shaft 21 passes is partitioned into two by a partition wall 23, and the other end of the fixed shaft 21 is held in one of the two parts, so that the elongated hole 17a is It is fixed to one end of 17a. The partition wall 23 deforms when the pushing force exceeds a predetermined force. Note that the partition wall 23 may be formed integrally with the propulsive force transmission member 17 or may be formed separately.

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

As shown in FIG. 4, the lower end of the fixed shaft holding member 25 has a stepped notch formed therein, and is fixed at a position where the notch engages with the end surface 14a of the band 14 and the claw 18a of the bracket 18. . This prevents the fixed shaft holding member 25 from shifting rearward, which prevents the wheels and the fixed shaft from becoming oblique during propulsion, allowing a stable propulsion posture to be maintained.

As shown in FIG. 6, a claw portion 24 is formed on the inner circumferential surface of the band 14 near the portion where the band 14 is tightened by the bolt 15 and nut 16. As shown in FIG. The claw portion 24 is formed to have a higher frictional force with the contact surface of the insertion opening 3 than other portions of the inner circumferential surface of the band 14.

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

To join a newly constructed pipe by the propulsion laying method using the propulsion transmission device 11 of the present invention, the propulsion 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 with the bolt 15 and nut 16 to fix the propulsive force transmission device 11 to the insertion port 3.

The fixed position of the propulsive force transmitting device 11 is a position where the pipe joint between the leading pipe 2 and the trailing pipe 5 can expand and contract when the insertion port 3 is fitted into the socket 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 the propulsive force transmission device 11 is fixed to the socket 3 of the trailing pipe 5 on the ground, the trailing pipe 5 is suspended underground (starting shaft) and fitted into the socket 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 while maintaining the contraction allowance T1 and the expansion allowance T2 at the pipe joint. The contraction allowance T1 corresponds to the distance from the tip of the insertion port 3 to the back end of the socket 1, and the expansion allowance T2 corresponds to the distance from the lock ring 6 to the retaining protrusion 4. In this way, by joining the pipes with a contraction allowance T1 and an expansion allowance T2, even if excessive pushing or pulling force is applied to the pipe joint due to an earthquake, etc., the pipe joint will not expand or contract. , can prevent pipe damage.

After joining the leading pipe 2 and the trailing pipe 5, insert the check gauge G (see Fig. 8) into the socket 1 through the gap between the band 14 and the end surface 1a of the socket 1, and check that the rubber ring 9 is correct. Determine whether it is in position or not.

In this way, the check gauge G can be inserted all the way around the socket 1 until it reaches the rubber ring 9, so the fit state of the rubber ring 9 can be reliably confirmed using the check gauge 48.

Note that the band 14 is attached at a position where the attachment distance T3 between the band 14 and the end surface 1a of the socket 1 is less than the contraction margin T1.

Next, when the trailing pipe 5 is pushed into the propulsion pipe line formed by the sheath pipe 19 using a hydraulic jack or the like, the propulsive force transmission 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 deep into the propulsion pipe.

In this way, since the work of installing the propulsive force transmitting device 11 can be performed above ground, the work of installing the propulsive force transmitting device 11 and the work of fitting the socket 3 into the receptacle 1 underground can be performed separately. As a result, the propulsion force transmission device 11 can be attached to the insertion ports 3 of the plurality of trailing tubes 5 on the ground, so the overall working time required for tube joining is shortened. In particular, the time required for underground work is significantly reduced.

In addition, installation work of the propulsion transmission device 11 underground takes time due to the narrow working space, but since the installation work of the propulsion transmission device 11 can be done above ground, the installation work of the insertion port 3 to the socket 1 can be done underground. Only fitting work and confirmation work using check gauge G are required. As a result, the overall working time required for pipe joining is reduced. In particular, the time required for underground work is significantly 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 into the sheath pipe 19 is applied to the insertion port 3 of the trailing pipe 5 by tightening. The propulsion force can be transmitted to the leading pipe 2 by means of a transmission member 17 attached via the means 12 . That is, as shown in FIG. 1, the pushing force can be transmitted to the leading pipe 2 by the propulsive force transmitting member 17 coming into contact with the end surface 1a of the socket 1.

Next, a change in the degree of deformation of the partition wall 23 of the propulsive force transmission member 17 will be explained using FIG. 9.

FIG. 9(A) shows an initial state in which the pushing force is zero. The pushing force gradually increases from this initial state, and when it exceeds a predetermined force, the partition wall 23 enters an initial deformed state as shown in FIG. 9(B). Then, the shrinkage allowance T1 and the attachment distance T3 become shorter and the expansion allowance T2 becomes longer by the amount that the partition wall 23 is deformed. Note that the length by which the propulsive force transmission member 17 slides due to the deformation (or breakage) of the partition wall 23 corresponds to the slide length T4.

Next, when the pushing force increases further, the partition wall 23 becomes completely deformed, as shown in FIG. 9(C). Then, as the partition wall 23 is further deformed, the contraction allowance T1 and the attachment distance T3 become further shorter, the expansion allowance T2 becomes longer, and the slide length T4 becomes zero. Note that the partition wall 23 may be stretched and deformed as shown in FIG. 9(C), or may be broken.

Next, when the pushing force is further increased from the state shown in FIG. 9(C), the band 14 is moved against the insertion port 3 of the trailing tube 5 while the partition wall 23 remains in the completely deformed state shown in FIG. 9(C). slide. In this case, the shrinkage allowance T1 becomes even shorter and the expansion allowance T2 becomes longer. Note that the attachment distance T3 does not change from the state shown in FIG. 9(C) because the band 14 slides backward from the initially attached position.

By the way, in this embodiment, the attachment strength of the band 14 to the insertion port 3 is such that it can withstand pushing force but slips due to large force during an earthquake. Here, "withstanding pushing force" does not mean that the band 14 will not slip at all when the newly installed pipes are propelled by the pushing force of a hydraulic jack, etc., but it does not mean that the band 14 will not slip at all when the newly installed pipes are propelled by the pushing force of a hydraulic jack or the like. This includes the case where the band 14 slips within a range where the contraction margin T1 does not become zero when the pushing force by a hydraulic jack or the like increases.

Furthermore, when an excessive pushing force is applied to the propulsion transmission device 11 due to an earthquake or the like, the partition wall 23 is completely deformed (or broken), and then the band 14 slips, resulting in a contraction gap as shown in FIG. 9(D). 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 all at once but gradually, reducing the impact when absorbing the contraction allowance T1 (like a cushion). can play a role). In addition, in the conventional propulsion force transmission device, the band member is attached at a position that is at least a length corresponding to the pushing space from the opening end of the socket on the outer surface of the insertion slot, so that excessive pushing force exceeding the pushing force during propulsion may occur. When a large force (force caused by an earthquake, etc.) is applied, the trailing tube is pushed forward at once (by the amount that the thrust transmitting member can withstand) after the thrust transmitting member is damaged, and an impact is applied to the tube.

Next, the movement of the propulsion force transmission device 11 during propulsion of a newly installed pipe will be described for cases where the propulsion path is straight and curved.

First, in the straight part of the propulsion pipe, the continuous newly installed pipe is propelled linearly along the pipe axis direction, so the three propulsive force transmitting members 17 each come into contact with the end surface 1a of the socket 1, and the pushing 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 force.

On the other hand, for example, if the propulsion pipe is bent to the left and new pipes that are continuous in the propulsion pipe are bent to the left at the connecting part and are propelled, the force applied to the left propulsive force transmission member 17 is , larger than the other propulsive force transmission members 17. Therefore, if only one propulsive force transmitting member 17 were to come into contact with the end surface 1a of the socket 1, conventionally, all the force would be applied to one propulsive force transmitting member 17 and it would be damaged. As a result, that part cannot receive the pushing force. Therefore, the remaining two will receive the pushing force, and the distance that can be propelled will be shortened.

However, in the propulsive force transmission member 17 of this embodiment, the partition wall 23 deforms when the pushing force exceeds a predetermined force. Therefore, in this case, the partition wall 23 of the left propulsive force transmitting member 17 is deformed and the attachment distance T3 is shortened, so that the other propulsive force transmitting member 17 comes into contact with the end surface 1a of the socket 1, and as a result, The three propulsive force transmitting members 17 enable the pushing force to be transmitted to the leading pipe 2. Note that even if the partition wall 23 is completely deformed as shown in FIG. It is possible to receive pushing force as before. As a result, when the propulsion pipe is curved, a larger pushing force can be transmitted than when pushing force is transmitted by only one propulsion force transmission member 17, so the newly installed pipe connected for a longer time can be propelled. can be done.

Note that when the three propulsive force transmitting members 17 are in contact with the end surface 1a of the socket 1, the deformation of the partition wall 23 due to the pushing force occurs before the band 14 slips. That is, the load F1 (an example of a "predetermined force") applied to the propulsive force transmitting device 11 when the partition wall 23 starts to deform is smaller than the load F2 applied to the propulsive force transmitting device 11 when the band 14 starts sliding.

Furthermore, when only one propulsive force transmitting member 17 contacts the end surface 1a of the socket 1 and the load is concentrated, the partition wall 23 is deformed by a load lower than the load F1 applied to the propulsive force transmitting device 11 (approximately (This is because the load is three times greater.)

As described above, the propulsive 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 transfers the pushing force of the trailing tube 5 to the leading tube 2. Each of the plurality of propulsive force transmitting means 13 has a partition wall 23 (an example of a "deformation part"), and the partition wall 23 has a plurality of propulsive force transmitting means 13 for transmitting the pushing force to a predetermined force. Deforms if exceeded.

Therefore, according to the propulsion force transmission device 11 of the present embodiment, when the propulsion pipe is curved and consecutive newly installed pipes are bent and propelled at the connecting portion, the propulsion force is generated at a position opposite to the direction of bending. Even if the transmission means is likely to come loose, the partition wall 23 will be deformed by applying a pushing force exceeding a predetermined force to the partition wall 23 of the propulsive force transmission means 13 located in the direction of bending. Since the propulsive force transmitting means 13 follows and contacts the socket 1 of the leading pipe 2, the propulsive force transmitting means 13 can disperse the pushing force to the socket 1 of the leading pipe 2, Furthermore, the newly installed pipe can be propelled while following the propulsion pipe. As a result, approximately the same number (distance) of new pipes can be pushed into the straight and curved parts of the propulsion pipe.

Further, in the propulsive force transmission device 11 according to the present embodiment, the leading pipe 2 and the trailing pipe 5 are joined with a predetermined contraction margin T1 between the tip of the insertion port 3 and the back end of the socket 1. , the propulsive force transmitting means 13 has a propulsive force transmitting member 17 that extends in the direction of the end face of the socket 1 and whose tip abuts on the end face 1a of the socket 1, and the band 14 has a propulsive force transmitting member 17 that extends in the direction of the end face of the socket 1, and the band 14 is connected to the end face 1a of the socket 1 and the socket of the band 14. The band 14 is attached at a position where the attachment distance T3, which is the distance between the side end faces, is less than the shrinkage margin T1, and the attachment strength of the band 14 to the insertion opening 3 is such that it can withstand pushing force, but is not strong enough to slip due to large force during an earthquake. be. 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 completion of propulsion, the band 14 will exert a tightening force against the insertion port 3 after the partition wall 23 is completely deformed (or broken). The impact on the pipe can be reduced because it begins to slide after it has endured more.

Furthermore, the propulsive force transmission device 11 according to the present embodiment includes a claw portion on at least a portion of the inner circumferential surface of the band 14, which makes the frictional force with the contact surface of the insertion port 3 higher than on other portions of the inner circumferential surface. 24 (an example of a "frictional force improving section") is formed. Thereby, the tightening force of the band 14 against the insertion opening 3 can be improved, making it difficult to slip, and variations in the strength of attachment of the band 14 to the insertion opening 3 by the installer can be absorbed.

Next, a modification of the propulsive force transmission device 11 will be described using FIG. 10. A major difference from the propulsive force transmitting device 11 in the embodiment described above is that the length of the propulsive force transmitting member 17 in the tube axis direction and the slide length T4 are longer. In the propulsive force transmission device 11 according to this modification, the partition wall 23 is formed to be more deformed (or broken) than in the above-described embodiment. This increases the margin until the partition wall 23 is completely deformed during propulsion, so even if the propulsion pipe has a steep curve, the deformation of the propulsive force transmission member 17 allows the pushing force to be stably applied to the leading pipe. It becomes possible to communicate. In this way, the design value of the slide length T4 can be set as appropriate while ensuring the attachment distance T3.

By the way, as shown in FIG. 11(A), when the propulsive force transmitting member 17 and the end surface 1a of the socket 1 come into contact with each other, when there are many newly installed pipes to be propelled in the propulsion pipe, or when the diameter of the newly installed pipes is large, the weight of the newly installed pipe to be propelled increases, and the force acting between the propulsive force transmitting member 17 and the end surface 1a increases, so it is necessary to improve the strength of the partition wall 23 to be able to handle the force. There is. On the other hand, when the strength of the partition wall 23 is improved, before the partition wall 23 deforms (or breaks), as shown in FIG. There is a possibility that the part between the bent part 17b and the elongated hole 17a of the main body part (the part where the partition wall 23 and the elongated hole 17a are formed) which is the part before a certain bent part 17b and the elongated hole 17a may be bent. In particular, in the case of a propulsive force transmitting member 17 having a long length in the tube axis direction, such as the propulsive force transmitting member 17 of the propulsive force transmitting device 11 shown in FIG. 10, the possibility of bending increases. This is because when the pushing force is transmitted to the leading pipe 2, as shown in FIG. 11(A), if the outside of the bent part 17b is formed in an arc shape, the bent part 17b does not come into contact with the end surface 1a. Therefore, the force F acting in the direction of the end surface 1a (direction perpendicular to the end surface 1a) (which does not come into contact because it is arcuate) is on the straight line in the tube axis direction (dotted chain line L) of the main body of the propulsive force transmitting member 17. A large force F acting in the direction of the end surface 1a acts on the distal contact portion 17d that contacts the end surface 1a beyond the bent portion 17b, and the force F gradually increases along the arc shape on the outside of the bent portion 17b. This occurs because the location where the molecule acts changes.

Therefore, as shown in FIGS. 12 and 13, a propulsive force transmitting member 17 different from the propulsive force transmitting member 17 according to this embodiment may be employed. Another propulsive force transmission member 17 has a contact portion for receiving a force F (a force in a direction perpendicular to the end surface 1a) that acts between the end surface 1a and the end surface 1a when the bent portion 17b contacts the end surface 1a. It has 17c. As a result, as shown in FIG. 14, the bending portion 17b can also receive the force acting in the direction of the end surface 1a on the straight line in the tube axis direction (dotted chain line L) of the main body portion of the propulsive force transmitting member 17. Even when a pushing force is applied, it is possible to prevent the partition wall 23 from being bent at the main body portion in front of the bent portion 17b before it is deformed (or broken).

Here, a method for 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 propulsive force transmitting member 17 before its tip is bent is cut out from a plate-like material that is the material of the propulsive force transmitting member 17. Further, a cut hole 17e is formed so that a contact portion 17c is formed when the distal end portion of the propulsive force transmission member 17 is bent. Then, by bending the tip of the propulsive force transmitting member 17, the propulsive force transmitting member 17 having the contact portion 17c is created.

Furthermore, as shown in FIG. 17, another propulsive force transmission member 17 may be employed. Furthermore, another propulsive force transmission member 17 has an end surface on the contact surface of a bent portion 17b whose outer side is formed in an arc shape and a distal side contact portion 17d that contacts the end surface 1a of the portion distal to the bent portion 17b. A contact plate 17f is provided that receives a force acting in the direction 1a (force from a direction perpendicular to the end surface 1a). The contact plate 17f can be attached to the propulsive force transmission member 17 by, for example, welding. According to the propulsion force transmission member 17 shown in FIG. 17, as shown in FIG. Since the force F can be received on a straight line in the tube axis direction (dotted chain line L), the location where the force F acts gradually does not change along the circular arc shape outside the bent portion 17b, and even when a large pushing force is applied. Even if the partition wall 23 is deformed (or broken), it is possible to prevent the main body portion from bending before the bending portion 17b.

Note that the propulsive force transmitting member 17, another propulsive force transmitting member 17, and still another propulsive force transmitting member 17 according to the present embodiment have bent portions 17b having an arcuate outer side formed by sheet metal bending. As shown in FIG. 20, another propulsive force transmitting member 17 may be used in which the outside of the bent portion 17b is formed at a right angle. In this case, the bent portion 17b is formed by casting, cutting, or the like. According to the other propulsive force transmitting member 17, the force acting in the direction of the end surface 1a can be received on the straight line in the tube axis direction (dotted chain line L) of the main body portion of the propulsive force transmitting member 17, so that a large pushing force is applied. Even in such a case, it is possible to prevent the partition wall 23 from being bent at the main body portion in front of the bent portion 17b before it is deformed (or broken).

1: Socket 1a: End surface 2: Leading pipe 3: Insertion port 4: Preventing protrusion 5: Trailing pipe 6: Lock ring 7: Groove for lock ring 8: Centering ring 9: Rubber ring 10: For rubber ring Groove 11: Propulsive force transmitting device of the present invention 12: Tightening means 13: Propulsive force transmitting means 14: Band 15: Bolt 16: Nut 17: Propulsive force transmitting member 17a: Long hole 17b: Bent part 17c: Contact part 17d: Tip side contact part 17e: Cut hole 17f: Contact plate 18: Bracket 19: Sheath tube 20: Wheel 21: Fixed shaft 22: Nut 23: Partition wall 24: Claw 25: Fixed shaft holding member G: Check gauge T1: Contraction allowance T2: Extension allowance T3: Installation distance T4: Slide length

Claims (11)

Propulsion for the propulsion construction method used in the propulsion construction method in which the pipes joined by fitting the socket of the trailing pipe into the socket of the leading pipe are successively pushed into the sheath pipe, and the newly installed pipe is laid inside the said sheath pipe. A force transmission device,
a ring-shaped band attached to the outer peripheral surface of the insertion port ;
a plurality of propulsive force transmitting means provided on the band and transmitting the pushing force of the trailing pipe to the leading pipe ;
has
Each of the propulsive force transmission means is
a propulsive force transmitting member that extends in the direction of the end surface of the socket and whose tip abuts the end surface of the socket;
a bracket fixed to the band;
a support member that supports the trailing tube within the sheath tube;
a fixed shaft, one end of which is attached to the bracket, for fixing the support member to the bracket;
has
The propulsive force transmission member has a long hole formed in the axial direction of the band,
The fixed shaft is fixed to one end of the elongated hole, and a partition wall is formed to partition the elongated hole,
The other end of the fixed shaft is irremovably inserted into one end of the elongated hole,
A propulsion force transmission device for a propulsion laying method , wherein the partition wall 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 with a predetermined distance between the tip of the insertion port and the back end of the socket,
The propulsion force transmission device for a propulsion laying method, wherein the band is attached to 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. The propulsion force transmission device for the propulsion laying method according to claim 1 or 2 ,
A propulsion force transmission device for a propulsion laying method, wherein the support member is a wheel. The propulsion force transmission device for the propulsion laying method according to claim 3,
A propulsion force transmission device for a propulsion laying method, wherein the fixed shaft serves as an axle for the wheel and rotatably fixes the wheel within a bracket. A propulsion force transmission device for a propulsion laying method according to any one of claims 1 to 4 ,
A propulsion force transmission device for a propulsion laying method, wherein a tip end of the propulsion force transmission member is bent so as to come into contact with the end surface of the socket. The propulsion force transmission device for the propulsion laying method according to claim 5 ,
The propulsive force transmission member has a bent portion that is a bent portion , and a first contact portion that comes into contact with the end surface of the receptacle beyond the bent portion,
When the propulsive force transmission member is viewed from above, an outer side of the bent portion is formed in an arc shape,
The propulsion force transmission device for a propulsion laying method, wherein the propulsion force transmission member has a second contact portion that contacts the end surface of the socket at a position overlapping the bent portion when viewed from above . The propulsion force transmission device for the propulsion laying method according to claim 5 ,
The propulsive force transmitting member has an arcuate outer side of a bent portion, and a surface that contacts the end surface of the socket at the bent portion and a portion beyond the bent portion, A propulsion force transmission device for a propulsion laying method, characterized by being provided with an abutment plate. The propulsion force transmission device for the propulsion laying method according to claim 5 ,
A propulsion force transmission device for a propulsion laying method, characterized in that an outer side of a bent portion, which is a bent portion of the propulsion force transmission member, is formed at a right angle. A propulsion force transmission device for a propulsion laying method according to any one of claims 1 to 8 ,
The propulsion force transmission device for a propulsion laying method, wherein the band is attached to the outer circumferential surface of the insertion port by a bolt passed between ends of the band and a nut screwed into the bolt. A propulsion force transmission device for a propulsion laying method according to any one of claims 1 to 9 ,
At least a portion of the inner circumferential 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 than other portions of the inner circumferential surface. Propulsion force transmission device for propulsion laying method. The propulsion force transmission device for the propulsion laying method according to claim 10 ,
A propulsion force transmission device for a propulsion laying method, wherein a protrusion is formed on the frictional force improving portion.

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