JP2945501B2 - Thrust transmission device in pipe propulsion device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thrust transmitting device for use in a device for constructing a pipeline underground by sequentially pushing a plurality of pipes into the ground, and more particularly to a thrust generated by a main pushing device. To a rearmost tube and an intermediate pushing device arranged in the pipeline to relay the thrust to an intermediate tube.

[0002]

2. Description of the Related Art In general, a pipe propulsion method for constructing a pipeline in the ground generally includes a shield type tunnel excavator for excavating earth and sand, and a plurality of pipes for arranging the pipe at an excavation site by the excavator. The excavator and all the tubes are advanced by applying the thrust of the main pushing device to the tube located at the rear end using the main pushing device that advances together with the excavator. However, in this known pipe propulsion method, the required thrust increases in proportion to the total length of the pipe to be propelled, that is, the distance between the shafts,
As a result, a large force acts on the tube. When a large force acts on the pipe in this way, the pipe may be damaged. Therefore, the pipe is applied to a method of propulsion of a pipe having a small compressive stress, particularly an axial compression load resistance, such as a pipe made of a synthetic resin such as vinyl chloride. Can not do. To solve this problem, if the wall thickness of the tube is increased to increase the axial compressive load capacity of the tube, the tube becomes expensive.

[0003] In order to solve the above-mentioned problem, a pipe propulsion method has been proposed which further uses an intermediate pushing device for applying the thrust of the main pushing device to one pipe other than the rearmost pipe. In this other pipe propulsion method, not only the thrust of the main pushing device is applied to the rearmost tube, but also the intermediate pushing device applies the thrust to the intermediate one tube, whereby the thrust applied to the rearmost tube causes the intermediate force to be applied. 1
The pipes behind the two pipes are propelled, and the thrust given to the one intermediate pipe propels the front pipe and the excavator. In such a pipe propulsion method, it is necessary to limit the thrust acting on the pipe to within an allowable range.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a tube propulsion device using a main pushing device and a middle pushing device, in which the thrust of the main pushing device can be transmitted to the rearmost tube and the middle pushing device, and the rearmost portion. A thrust transmitting device capable of measuring a thrust transmitted to a pipe.

[0005]

A thrust transmitting device according to the present invention is a first transmission for receiving a thrust of the main pushing device and transmitting the thrust to the middle pushing device in a pipe propulsion device using a main pushing device and a middle pushing device. Means and second transmitting means for receiving the thrust of the main pushing device and transmitting the thrust to the rearmost tube. The second transmission means includes first and second transmission members extending around the axis of the pipeline and relatively displaceable in the axial direction of the pipeline. The first and second transmission members jointly define a space that extends around the axis and is axially extendable to contain a fluid for measuring thrust transmitted to the rearmost tube. . The first
Is disposed between the main pushing device and the second transmitting member to receive a thrust from the main pushing device and transmit the thrust to the second transmitting member via the fluid in the space. Is done. On the other hand, the second transmission member is disposed between the first transmission member and the rearmost portion to transmit the received thrust to the rear end face of the rearmost tube.

[0006] The thrust of the main pushing device is transmitted to the first and second transmission means. The thrust transmitted to the first transmission unit is transmitted to the relay unit. On the other hand, the thrust transmitted to the second transmitting means is transmitted from the first transmitting member to the second transmitting member via the fluid in the space, and finally the second transmitting member.
From the transmission member to the rearmost tube. The pressure in the space of the second transmission means changes in proportion to the thrust transmitted from the first transmission member to the second transmission member. For this reason, the thrust transmitted to the final pipe can be known by measuring the pressure in the space.

As described above, according to the present invention, not only can the thrust of the main pushing device be transmitted to the rearmost tube and the intermediate pushing device, but also the thrust transmitted to the rearmost tube can be measured. Can be.

[0008] The first transmission means extends between the main pushing device and the middle pressing device around the axis to receive the thrust of the main pushing device and transmit the thrust to the middle pressing device. It is preferable to provide an annular member that directly or indirectly abuts the rear end surface of the device.
Thereby, the thrust does not concentrate on a specific portion of the intermediate pressing device, and the thrust can be uniformly distributed to each part of the rear end face of the intermediate pressing device. It is preferable that the first and second transmission members are annular members extending continuously around the first transmission means, and the second transmission member is brought into contact with a rear end surface of the rearmost tube. This makes it possible to uniformly disperse the thrust in each part of the rear end surface of the rearmost tube.

In another thrust transmitting device according to the present invention,
Is disposed between the main pushing device and the rearmost tube so as to receive the thrust of the main pushing device and transmit the thrust to the rearmost tube instead of the first and second transmitting members. At least one load cell is provided. The load cell has a function of transmitting the thrust of the main pushing device to the rearmost tube. The thrust transmitted to the last tube is measured by the load cell. Therefore, not only can the thrust of the main pushing device be transmitted to the rearmost tube and the middle pushing device, but also the thrust transmitted to the rearmost tube can be measured.

It is preferable that the second thrust transmitting means further includes an annular member disposed between the load cell and the rearmost tube and abutting on a rear end surface of the rearmost tube. This makes it possible to uniformly disperse the thrust in each part of the rear end surface of the rearmost tube.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A tube propulsion device 10 shown in FIG.
2, an excavator 14 for excavating earth and sand, an intermediate pushing device 18 disposed in a pipeline defined by a plurality of pipes 16 arranged sequentially in series behind the excavator, and a main pushing device 12
And the thrust transmitting device 20 of the present invention for transmitting the thrust generated by the above to the pipe 16 disposed at the rearmost portion and the intermediate pushing device 18.

The main pushing device 12 includes a plurality of multi-stage jacks 21 which are operated synchronously, a push wheel or slider 22 which is reciprocated by the operation of each jack 21, and a guide rail 23 which regulates the movement of the slider. including. The original pushing device is known, for example, from Japanese Patent Application Laid-Open No. Sho 60-219395, and a detailed description thereof is omitted. The main pushing device 12 is arranged in the starting shaft 24. A reaction wall 25 is formed in the starting shaft 24.

The excavator 14 is a known shield type tunnel excavator that excavates earth and sand while being advanced toward the reaching shaft by the thrust of the main pushing device 12. Such an excavator is well known, for example, from JP-A-63-189596, and a detailed description thereof will be omitted. Excavator 14
A cushioning member 26 (see FIG. 1) is attached to the rear end face of the rear panel.

Each tube 16 has a circular cross section and a collar 28 for reinforcing the ends of adjacent tubes.
Are provided on the outer peripheral surfaces of both ends. Each tube 16
Can be made of a synthetic resin such as vinyl chloride.

The intermediate pushing device 18 includes a plurality of tubular relay bodies 30 which are sequentially arranged in the pipe by extending the pipe.
Is attached to a predetermined relay body 30 and receives a thrust from the relay body.
It includes a plurality of middle push mechanisms 32 for pushing one relay body 30 and a plurality of rods 34 used when removing the middle push device 18.

Each relay 30 is formed of a metal pipe having an outer diameter slightly smaller than the inner diameter of the pipe 16. A plurality of auxiliary members 36 that maintain the relay bodies 30 coaxially with the pipes 16 when the relay bodies 30 are disposed in the predetermined pipe 16 are attached to outer peripheral surfaces of both ends of each relay body 30. Each auxiliary member 36
When this is placed in a predetermined pipe 16, the relay 3
0 is slidably abutted against the inner surface of the "0".

[0017] The front end of the relay body 30 to be placed first is:
It is reinforced by a ring 38 mounted on the inside. The ring 38 has a pair of attachment portions 42 for attaching the distal ends of the first pair of rods 34 with nuts 40.

Each of the other plurality of relay bodies 30 has a plurality of pieces or pieces 44 received inside the rear end of the preceding relay body.
At the front end. The pieces 44 are arranged at equal angular intervals around the axis of the relay body 30, and are received by the preceding relay body to prevent the adjacent relay bodies from being relatively displaced in the radial direction.

As shown in FIG. 2, one of the intermediate push mechanisms 32 is one of the two adjacent relay bodies 30.
To push the rear end face of the front relay 30, the rear relay 30
A first pressing head 46 extending forward from the front end of the intermediate tube 16 and a second pressing head 48 disposed at the front end of the rear intermediate body 30 to press the rear end face of the intermediate tube 16.

As shown in FIGS. 2 to 5, the first pressing head 46 is formed on a cylindrical portion 50 having an outer diameter smaller than the inner diameter of the relay body 30, and on the outer periphery of the rear end of the cylindrical portion. A flange-shaped base 52, a flange-shaped pressing portion 54 formed on the outer periphery of the front end of the cylindrical portion 50, a plurality of pieces 56 attached to the pressing portion 54, and a hole through which the rod 34 slidably penetrates. And a plurality of reinforcing ribs 60 fixed to the base 52.

The first pressing head 46 is fixed to the inside of the distal end of the relay body 30 at the base 52 and the rib 60. The piece 56 extends forward from the pressing portion 54 so as to perform the same function as the piece 42, and is received by the rear end of the preceding relay body 30 and performs the same function as the piece 42. For this reason, the relay body 30 to which the middle push mechanism 32 is attached is
It does not have the piece 42 described above. The bracket 58 is attached inside the tubular portion 50.

As shown in FIG. 3, the second pressing head 48 includes a plurality of claw assemblies 62 arranged at equal angular intervals around the axis of the cylindrical portion 50 of the first pressing head 46. As shown in FIG. 4, each claw assembly 62 is disposed in a space defined by the cylindrical portion 50, the base 52, and the pressing portion 54 of the first pressing head 46.

As shown in FIGS. 4 and 5, each claw assembly 62 is provided with a plurality of support members 64 arranged at intervals around the cylindrical portion 50 and extending in the front-rear direction. A plurality of claws 66 extending in the front-rear direction, a shaft 68 for supporting the rear end of the claws on the support member 64 so as to be rotatable about an axis extending in a tangential direction of the relay body 30, and a tip end of the claws 66 are connected to each other. Piece 70 and the pawl 66
And a spring 72 for urging the pawl 66 to rotate about.

Each support member 64 is provided with a first pressing head 46.
Are fixed to the cylindrical portion 50, the base 52, and the pressing portion 54 so as to extend in the axial direction of the relay body 30 in parallel with each other in the space defined by the cylindrical portion 50, the base 52, and the pressing portion 54. . For this reason, the first pressing head 46
At the base 52, the distal end of the relay 30 is extended so as to extend forward from the front end of the relay 30 to which the second pressing head 48, in particular, the claw assembly 62 is bypassed toward the center of the relay 30. It is attached to the inside of the department.

Each pawl 66 has a shaft 68 at its rear end.
And a boss for receiving the boss. When each claw 66 is open, that is, when each claw 66 is rotated to the position shown by the solid line in FIG. 5, each boss is closed with a stopper 74 that contacts the distal end surface of the relay body 30 and each claw 66 is closed. And a stopper 76 that comes into contact with the inner surface of the distal end portion of the relay body when it is rotated to the position shown by the two-dot chain line in FIG.

The spring 72 is a leaf spring and is disposed between the front end of the support member 64 and the rear end of the piece 70. For this reason, the engagement position between the piece 70 and the spring 72 is
And radially outward from an extension of a line connecting the engagement portion of the spring 72 and the rotation center of the pawl 66, that is, the pawl 66
Is rotated to the position shown by the solid line in FIG. 5, the force of the spring 72 acts on the pawl 66 so as to open the pawl 66 further. On the other hand, if the engagement position between the piece 70 and the spring 72 is inside the extension line, that is, if the pawl 66 is rotated to the position shown by the two-dot chain line in FIG. The force acts on the pawl 66 to close it.

In use, the pawl 66 is placed in the open position shown by the solid line in FIG. On the other hand, when the middle pressing device 18 is retracted to remove the middle pressing device 18, the claw 66 is
It is rotated to the position shown by the two-dot chain line in FIG. 5 and closed.

Each supporting member 64 prevents the piece 70 from contacting when the pawl 66 rotates from the position shown by the solid line in FIG. 5 to the position shown by the two-dot chain line in FIG. It has a notch 64a that acts.

As shown in FIG. 5, a seal member 78 for stopping water is provided between each collar 28 and the pipe 16.
Is arranged. Adjacent rods 34 are connected to each other by a connector 80. Each of the rods 34 inserted into the bracket 58 of the intermediate pushing mechanism 32 is detachably attached with a stopper 82 that comes into contact with the corresponding bracket 58 when a series of rods is pulled backward.

As shown in FIG. 6, the thrust transmitting device 20
A first thrust transmitting body that receives the thrust of the main pushing device 12 and transmits the thrust to the middle pushing device 18, that is, a first transmitting means 84.
Receiving the thrust of the main pushing device 12 and sending it to the rearmost tube 16.
Thrust transmitting body, that is, the second transmitting means 8 for transmitting to the
6 is included.

The first transmission means 84 is formed of an annular member extending around the axis of the conduit, and is attached to the front surface of the slider 22 by a plurality of bolts 88. The front end face of the first transmitting means 84 is directly in contact with the rear end face of the rearmost relay body 30 (or indirectly via a buffer member or the like), and the rear end face of the transmitting means 84 is in contact with the front end face of the slider 22. The contact is made directly (or indirectly via a buffer member or the like).

The second transmitting means 86 includes the first transmitting means 8
The transmission member 90 includes a pair of annular transmission members 90 and 92 that extend continuously around the periphery 4 and are relatively displaceable in the axial direction, and a stopper 94 that limits a movable range of the transmission members 90 and 92.

The transmission members 90 and 92 partially overlap each other in the radial direction and are fitted to each other so as to be relatively displaceable in the axial direction, and measure the thrust transmitted to the rearmost tube 16. Jointly define a space 96 for containing a fluid to be filled. The space 96 extends continuously around the axis, and expands and contracts in the axial direction with the relative movement of the transmission members 90 and 92. Stopper 9
4 limits the movable range in the direction in which the space 96 contracts.

The transmission member 90 receives thrust from the main pushing device 12 and transmits the thrust through the fluid in the space 96 to the transmission member 9.
2 and the slider 2
2 directly (or indirectly via a buffer member). On the other hand, the transmission member 92 is arranged so as to transmit the received thrust to the rearmost tube 16, and directly (or indirectly via a buffer member or the like) to the rear end face of the rearmost tube 16. A) is abutted.

A fluid such as oil is sealed in the space 96, and a nipple 98 having a hole communicating with the space 96 is attached to the transmission member 90. The hole in the nipple 98 is connected to a pressure detector 100 such as a pressure gauge.
Leakage of fluid from between the transmission members 90 and 92 is prevented by the seal member 102 disposed therebetween.

At the time of propulsion, first, a step of moving the excavator 14 forward by a predetermined distance is performed. For this reason, the thrust of the main pushing device 12 is transmitted from the slider 22 to the rear end face of the excavator 14 via the thrust transmitting device 20 and the buffer member 78. Thereby, the excavator 14 moves forward while excavating the ground.

When the excavator 14 completes the excavation of the predetermined length, the first collar 28 is disposed at the rear end of the excavator 14, and the first pipe 16 having the first rod 34 attached to the mounting portion 42 and the first After the first relay 28 is disposed after the first collar 28, the thrust of the main pushing device 12 is transmitted to the first pipe 16 by the first transmission means 84, and the first relay is transmitted by the second transmission means 86. It is transmitted to the body 30.

While the excavator 14 is advanced, the first relay 30 is brought into contact with the pressed surface of the first collar 28, but the first pipe 16 is moved from the pressed surface of the first collar 28 to FIG. The predetermined interval L1 is maintained. As a result, the excavator 14 advances while excavating the ground by receiving the thrust from the first relay body 30, but the thrust for advancing the excavator 14 does not act on the first pipe 30. The interval L1 is thereafter maintained at a predetermined value. The interval L1 can be adjusted to an appropriate value by, for example, selecting the pipe 16 and the relay 30 having an appropriate length.

Next, a new collar and tube are placed after the last tube, and a new relay is placed after the last relay, respectively, and a new rod is connected with the connector 80 after the last rod. After connecting to the end, the first step of transmitting the thrust of the main pushing device 12 to the new pipe and the new relay body 30 is repeated a predetermined number of times. As a result, the plurality of pipes 16 are sequentially arranged at the excavation site of the excavator 14.

The thrust to be transmitted to the rearmost relay 30 is:
The greater the number of tubes to be propelled, the greater the pressure, and the pressure in the space 96 is proportional to the thrust transmitted to the rearmost relay 30. The thrust transmitted to the rearmost relay body 30 is detected as pressure in the space 96 by the pressure detector 100 and monitored. The first step is repeated until the value detected by the pressure detector 100 reaches a predetermined value, that is, a permissible limit value for breaking the pipe.

The distance L1 between the new pipe 16 and the new relay 30 is between the first pipe 16 and the first collar 28, that is, between the foremost pipe 16 and the foremost collar 28.
Is always chosen to keep the length. For this reason, each pipe 16
Receives the thrust for moving the excavator 14 forward, but does not receive the thrust for moving the excavator 14 forward.

When a predetermined number of tubes 16 are arranged, the stopper 82 is attached to the last rod 34,
A relay body 30 having an intermediate pressing mechanism 32;
After the rod 34 is connected to the last rod, a second step of transmitting the thrust of the main pushing device 12 to the latest pipe and the latest relay body is performed.

The stopper 82 is used when removing the intermediate pushing device 18 and moves the series of rods 34 to a predetermined distance L.
3 When moved rearward, it is releasably fixed at a position where it comes into contact with the bracket 58 of the intermediate pushing mechanism 32. The stopper 82 may be previously attached to a rod to which the stopper 82 is attached.

As shown in FIG. 2 and FIG.
2 is arranged such that its first pressing head 46 presses the rear end face of the front relay body and the second pressing head 48 presses the rear end face of the front pipe via the collar 28. As a result, the thrust of the main pushing device 12 is divided by the middle pushing mechanism 32, and the pipe ahead of the latest pipe and the relay body ahead of the latest relay body are advanced by the middle pushing mechanism 32 together with the middle pushing mechanism 32.

While the intermediate pushing mechanism 32 is advanced and thereafter, the above-mentioned distance L1 is maintained at a predetermined value, and the distance L2 (see FIG. 4) between the latest tube and the latest color is maintained at a predetermined value. Is maintained. Therefore, the excavator 14 receives the thrust from the first relay 30, and the thrust for moving the excavator 14 forward does not act on the first pipe 30. The interval L2 can also be adjusted to an appropriate value by, for example, selecting a pipe and a relay having an appropriate length.

The stopper 74 of the pawl 66 is brought into contact with the distal end surface of the relay body 30 while the intermediate pushing mechanism 32 is advanced and thereafter. Therefore, the pawl 66 does not open any more, and the thrust is reliably transmitted.

Thereafter, a new collar and tube are placed after the rearmost tube, the relay body without the middle push mechanism 32 is placed after the rearmost relay body, and the latest rod is connected to the rearmost rod. After that, a first step of repeating the step of transmitting the thrust of the main pushing device to the latest pipe and relay body a predetermined number of times, and thereafter, a new collar and a pipe are provided again after the last pipe with the intermediate pushing mechanism 32. A second step of disposing the relays after the rearmost relay, connecting the latest rod to the rearmost rod, and transmitting the thrust of the main pushing device to the latest pipe and the latest relay, respectively. It is repeated a predetermined number of times.

At this time, the thrust transmitted to the rearmost relay 30 is converted into the pressure in the space 96 by the pressure detecting means 100.
Detected and monitored. Further, the first step is repeated until the value detected by the pressure detector 100 reaches a predetermined value, that is, a permissible limit value for breaking the pipe.

During the repetition of the first and second steps, the thrust for advancing the pipe is transmitted in a group consisting of a plurality of pipes, and the distances L1 and L2 are maintained at predetermined values. You. Therefore, a large thrust does not act on each pipe. As will be described later, the intervals L2 and L3 are selected to be shorter as the interval corresponding to the front middle push mechanism 32.

When the pipe has been laid between the starting shaft 24 and the reaching shaft, the series of rods 34 is retracted until the pawl of the foremost intermediate pushing mechanism is closed. As a result, the stopper 82 corresponding to the foremost intermediate pressing mechanism comes into contact with the corresponding bracket 58, so that the foremost intermediate pressing mechanism is retracted, and its claw abuts on the distal end surface of the rear intermediate body and closes. At this time, the stopper corresponding to the rear middle pressing mechanism does not come into contact with the corresponding bracket, so that the pawl of the rear middle pressing mechanism remains open. In that state,
In order to make the foremost distance L2 zero, the main pushing device 12 is further operated. Accordingly, the second and subsequent middle pushing mechanisms are advanced, and the pipe behind the foremost middle pushing mechanism is advanced, so that the pipe behind the foremost middle pushing mechanism is connected to the front pipe.

After that, a series of rods 34 are moved until the pawl of the foremost middle pressing mechanism of the middle pressing mechanism with the pawls opened is closed.
Is retracted, and the step of further operating the main pressing device 12 is repeated until the interval L2 corresponding to the first intermediate pressing mechanism becomes zero. Thereby, all the tubes are connected.

When all the tubes are connected, the tube propulsion device is removed. Prior to this, simultaneously or after this, the excavator is removed on the side of the reaching shaft. The removal operation of the pipe propulsion device is performed, for example, by pulling out the relay body and the rod one by one to the side of the starting shaft and disassembling it.

Each interval L2 is selected to a value that does not come into contact with the corresponding pawl 66 of the intermediate pushing mechanism 32 when the pipe is advanced so that each interval L2 before the interval L2 becomes zero. Further, when the series of rods are moved backward, even if the claw 66 of the intermediate pushing mechanism 32 at the previous stage is closed,
The value that maintains the opened state of the pawl 66 of the corresponding middle push mechanism 32, that is, the value that does not cause the rear end surface of the pawl 66 to contact the front end of the relay body is selected.

Instead of measuring the thrust transmitted to the rearmost tube as the pressure in the space 96, a plurality of load cells are connected between the transmission members 90 and 92 or between the transmission member 92 and the slider 2.
2 may be spaced apart around the axis of the conduit.

The thrust transmitting device 110 shown in FIGS. 7 and 8
The first transmission means 112 receives the thrust of the main pushing device and transmits the same to the intermediate pressing device, and the second transmission means 114 receives the thrust of the main pushing device and transmits the same to the rearmost tube 16. including.

The first transmission means 112 is composed of a plurality of arc-shaped pressing pieces 116 arranged at intervals around the axis of the conduit.
Consists of Each pressing piece 116 is attached to the rear end face of the slider 22 by a plurality of bolts 118, and is in contact with the rear end face of the rearmost relay body 30.

The second transmitting means 114 includes a plurality of load cells 120 arranged between the adjacent pressing pieces 116 to receive the thrust from the slider 22,
A pressure ring 122 disposed in front of the load cell 120 to receive from the zero actuator 124.

Each load cell 120 is attached to the slider 22 at its base by a plurality of bolts. On the other hand, the pressing ring 122 transmits the received thrust to the rearmost tube 16 so as to transmit the thrust to the rearmost tube 1 during use.
6 and is in contact with the front end of the actuator 124 of the load cell 120.

The thrust transmitting device 110 is connected to the rearmost relay 3
Except that the thrust to be transmitted to zero is measured by the load cell 120, it is used in the same manner as the thrust transmitting device 20 described above.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a pipe propulsion device according to the present invention.

FIG. 2 is an enlarged sectional view of a portion 2 in FIG.

FIG. 3 is a sectional view taken along line 3-3 in FIG.

FIG. 4 is an enlarged sectional view of a portion 4 in FIG.

FIG. 5 is a sectional view taken along line 5-5 in FIG.

FIG. 6 is an enlarged sectional view of a part of the thrust transmitting device.

FIG. 7 is an enlarged sectional view of another thrust transmission device.

FIG. 8 is a sectional view taken along line 8-8 in FIG. 7;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Pipe propulsion device 12 Main pushing device 14 Excavator 16 Pipe 18 Middle pushing device 20,110 Thrust transmission device 22 Slider 30 Intermediate body 84,86 First and second transmission means 90,92 First and second transmission member 96 Space for pressure measurement 100 Pressure measuring device 112, 114 First and second transmission means 116 Pressing piece 120 Load cell 122 Pressing ring

Claims (5)

(57) [Claims] 1. A plurality of pipes sequentially arranged in a propulsion direction to define a pipe, a thrust generated by a main pusher is transmitted to a rearmost pipe, and a middle pusher arranged in the pipe. In the pipe propulsion device to be propelled by transmitting the thrust of the main pushing device and transmitting the thrust to the intermediate pushing device in the pipe propulsion device to be propelled by transmitting the thrust of the main pushing device, And a second transmission means for receiving the transmission to the rearmost tube, the second transmission means extending around the axis of the conduit and being relatively displaceable in the axial direction. A first and a second transmission member jointly defining a space extending around the axis and capable of extending and contracting in the axial direction to contain a fluid for measuring thrust transmitted to the rearmost tube. A first transmission member and a second transmission member; The first transmission member receives a thrust from the main pushing device and transmits the thrust to the second transmission member via the fluid in the space by the main pushing device and the second transmission member. The second transmission member is disposed between the first and second transmission members to transmit the received thrust to the rearmost tube.
Is disposed between the transmission member and the rearmost tube,
Thrust transmission device in pipe propulsion device. 2. The first transmission means extends between the main pushing device and the intermediate pushing device around the axis so as to receive the thrust of the main pushing device and transmit the thrust to the intermediate pushing device. The thrust transmission device according to claim 1, further comprising an annular member that directly or indirectly abuts a rear end surface of the intermediate pushing device. 3. The first and second transmission members extend continuously around the first transmission means, and the second transmission member is directly or indirectly attached to a rear end face of the rearmost tube. The thrust transmission device according to claim 2, wherein the thrust transmission device is abutted. 4. A plurality of pipes sequentially arranged in a propulsion direction to define a pipe, a thrust generated by a main pusher is transmitted to a rearmost pipe, and a middle pusher arranged in the pipe. In the pipe propulsion device to be propelled by transmitting the thrust of the main pushing device and transmitting the thrust to the intermediate pushing device in the pipe propulsion device to be propelled by transmitting the thrust of the main pushing device, And a second transmission means for receiving the thrust of the main pushing device and transmitting the thrust to the rearmost pipe. A thrust transmission device in a tube propulsion device comprising at least one load cell disposed between a main pushing device and the rearmost tube. 5. The second thrust transmitting means is further arranged between the load cell and the rearmost tube, and is pressed directly or indirectly on the rear end face of the rearmost tube. The thrust transmission according to claim 4, comprising a ring.