JP2945500B2 - Pipe propulsion method and apparatus - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe propulsion method and apparatus suitable for constructing a pipe underground, and more particularly, to an apparatus for pushing a plurality of pipes arranged sequentially in a propulsion direction to define a pipe. The present invention relates to a method and an apparatus for propulsion by thrust generated from a vehicle.

[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. However, in this other pipe propulsion method, although a large force is required to propel the excavator, the thrust for propelling the excavator is transmitted through the front pipe, so that the A large force acts on this tube, especially on the intermediate tube. Further, when the total length of the rear pipe to which thrust is transmitted without passing through the intermediate pushing device or the total length of the front pipe to which propulsion is transmitted via the middle pushing device becomes large, the last of the front pipes becomes longer. A large force acts on the bottom tube or the last one of the rear tubes. For this reason, other pipe propulsion methods cannot propel a pipe having a small axial compressive load capacity.

[0004] One method of propelling a tube with low axial compression capacity is to provide a casing disposed within the tube to be propelled and having approximately the same length as the tube, and a thrust transmission disposed about the casing. A pipe propulsion method using a member has been proposed (Japanese Utility Model Laid-Open No. 26696/1990).
This still another pipe propulsion method transmits the thrust of the casing to the pipe via the thrust transmitting member by advancing the casing with the main pushing device while the thrust transmitting member is in frictional contact with the inner surface of the pipe, Advance the tube. However, in this still another pipe propulsion method, it is difficult to transmit sufficient thrust to the pipe to advance the pipe because the thrust transmitted to the pipe depends on the frictional force between the transmission member and the pipe.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to reduce the thrust acting on each tube so that a plurality of tubes can be propelled without damaging each tube.

[0006]

A pipe propulsion method according to the present invention comprises a plurality of relay means arranged in a pipe defined by a pipe for relaying a thrust of a main pushing device, and a middle pushing means which is disposed adjacent to an arbitrary pushing means. Of the two relay means, so as to receive the thrust from the rear relay means, and the rear end of an arbitrary intermediate pipe and the rear end of the front relay means of the two relay means by the middle pressing means. Including pressing. The pipe propulsion device of the present invention includes:
An intermediate pushing device for pushing an intermediate tube among the tubes is included. The intermediate pushing device includes a plurality of relay means sequentially arranged in a propulsion direction within a pipe defined by a pipe, and a relay between two arbitrary adjacent relay means to relay the thrust of the main pushing device. And a middle push means receiving thrust from the means and pushing against the rear end of any intermediate tube and the rear end of the forward relay means of the two relay means.

[0007] The thrust of the main pushing device is transmitted to the rearmost tube and the rearmost relay means. The thrust transmitted to the last tube is sequentially transmitted to all tubes behind the middle tube. On the other hand, the thrust transmitted to the rearmost relay unit is transmitted to the intermediate pressing unit via each of the relay units disposed behind the intermediate pressing unit. Thereby, since the intermediate pushing means pushes the rear end of the intermediate pipe and the rear end of the relay means in front, the thrust is further increased by each pipe arranged in front of the intermediate pushing means and the relay means in front of the intermediate pushing means. And transmitted to the excavator. For this reason, by arranging a plurality of intermediate pushing means at intervals in the axial direction of the pipe, the force acting on each pipe can be reduced.

According to the present invention, since the rear end of the intermediate pipe and the rear end of the forward relay are pushed by the middle pushing means, the thrust acting on each pipe can be reduced.
Therefore, a plurality of pipes can be propelled without applying a large thrust to each pipe so as to damage the pipes.

Further, it is preferable that the excavator is pushed by the relay means arranged at the forefront. As a result, the force acting on the excavator is reduced as compared with the case where the thrust for advancing the excavator is transmitted through the foremost tube. Further, while pushing the excavator by the foremost relay means, in order to prevent the thrust transmitted to the foremost tube from being transmitted to the excavator, the foremost tube and the excavator Preferably in a state where they do not engage with each other.
Thereby, it is possible to prevent a thrust for moving the excavator forward from acting on the pipe. Further, while the rear end portions are pressed by the intermediate pressing means, the thrust transmitted to the intermediate pipe and the subsequent pipe disposed after the intermediate pipe is transmitted to the intermediate pipe. It is preferable to include maintaining the two in a state in which they do not engage with each other in order to prevent the situation. Accordingly, it is possible to prevent a thrust for advancing a tube ahead of the subsequent tube from acting on the subsequent tube.

[0010] The intermediate pressing means is supported by the rear relay means and extends forward from the rear relay means to press the rear end of the front relay means. And a second pressing head disposed at a front end of the rearward relay means to press a rear end. The second pressing head may include a plurality of claw assemblies arranged at equal angular intervals around the axis of the conduit. In this case, each claw assembly can be displaced to a position where it engages with the rear end of the intermediate tube when the intermediate pushing means advances, and to a position where it does not hinder the advancement of the subsequent tube when the intermediate pushing means is removed. be able to. Each of the relay means may have a cylindrical shape, and the first pressing head may extend forward from the front end of the rear relay means, bypassing the claw assembly toward the center of the conduit.

[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 defined by a plurality of pipes 16 arranged in series behind the excavator, and a thrust generated by the main pushing device at the rear end. It includes a thrust transmitting device 20 for transmitting to the arranged tube 16 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 12 is known, for example, from Japanese Patent Application Laid-Open No. Sho 60-219395, and a detailed description thereof will be omitted. The main pushing device 12 is arranged in the starting shaft 24. A reaction wall 25 is formed in the 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 1
A cushioning member 26 (see FIGS. 1 and 2) is attached to the rear end surface of the reference numeral 4.

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 20 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 intermediate pushing mechanisms 32 for pushing one relay body 30 and a plurality of rods 34 used when removing the intermediate pushing device 20.

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
Is slidably abutted on the inner surface of the relay 30 when placed in the predetermined pipe 16.

As shown in FIGS. 2 and 6, the front end of the relay body 30, which is initially placed, is reinforced by a ring 38 mounted 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.

As shown in FIG. 3, one of the plurality of relay bodies 30 has a plurality of pieces or pieces 44 at its front end which are received inside the rear end of the preceding relay body. . 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.

Each of the intermediate pressing mechanisms 32 includes a first pressing head 46 extending forward from the front end of the rear relay body 30 to press the rear end face of the front relay body 30 among two adjacent relay bodies 30; 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. 4, 7, 8 and 9, the first
The pressing head 46 has a cylindrical portion 50 having an outer diameter smaller than the inner diameter of the relay body 30, a flange-shaped base portion 52 formed on the outer periphery of a rear end portion of the cylindrical portion, and a front end portion of the cylindrical portion 50. A flange-shaped pressing portion 54 formed on the outer periphery, a plurality of pieces 56 attached to the pressing portion 54, a pair of brackets 58 having a hole through which the rod 34 slidably penetrates;
A plurality of ribs 60 fixed to the second rib.

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. 7, 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. 9, 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. 8 and 9, each claw assembly 62 has a plurality of support members 64 arranged around the tubular portion 50 at intervals 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 indicated by the solid line in FIG. 9, each stopper portion 74 that contacts the distal end surface of the relay body 30 and each claw 66 is closed. And the stopper 76 is in contact with the inner surface of the distal end 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. 9, 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 claw 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 intermediate pressing device 20 is retracted to remove the intermediate pressing device 20, the rear surface of the pawl 66 comes into contact with the distal end of the relay body 30 so that the pawl 66
Is closed by being rotated to the position shown by the two-dot chain line in FIG.

Each support member 64 prevents the piece 70 from abutting when the pawl 66 rotates from the position shown by the solid line in FIG. 9 to the position shown by the two-dot chain line in FIG. It has a notch 64a that acts.

As shown in FIG. 9, a part of 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.

The thrust transmitting device 20 receives the thrust from the main pushing device 12 and transmits the thrust to the pipe 16 disposed at the rearmost portion and the relay body 30 disposed at the rearmost portion.

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 20 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 arranged 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
And the first relay 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 in 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, and a new rod is connected to 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 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 and
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 to remove the propulsion device, and is releasably fixed to a position where it comes into contact with the bracket 58 of the intermediate pushing mechanism 32 when the series of rods 34 is moved backward by a predetermined distance L3. . Stopper 82
May be previously attached to a rod to which it is attached.

As shown in FIG. 4 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 distance L1 is maintained at a predetermined value, and the distance L2 (see FIG. 4) between the latest tube and the latest collar 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 in contact with the distal end surface of the relay 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 intermediate 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 relay body after the rearmost relay body and connecting the latest rod to the rearmost rod, and then transmitting the thrust of the main pushing device to the latest pipe and the latest relay body. Repeat a predetermined number of times.

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 is 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 this state, the main pushing device 12 is further operated in order to reduce the foremost distance L2 to zero. 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.

Thereafter, a series of rods 34 until the pawl of the foremost intermediate pressing mechanism of the intermediate pressing mechanisms with the pawls open 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 tubes have been 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 be 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.

[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 an enlarged sectional view of a portion 3 in FIG.

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

FIG. 5 is an enlarged sectional view of a portion 5 in FIG.

FIG. 6 is a sectional view taken along line 6-6 in FIG. 2;

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

FIG. 8 is an enlarged sectional view of a portion 8 in FIG. 7;

9 is a cross-sectional view taken along line 9-9 in FIG.

DESCRIPTION OF SYMBOLS 10 Pipe propulsion device 12 Main pushing device 14 Excavator 16 Pipe 18 Middle pushing device 28 Collar 30 Intermediate body (Relaying means) 32 Middle pushing mechanism (Medium pushing means) 34 Rod 46 First pushing head 48 Second pushing Head 62 Claw assembly

Claims (9)

(57) [Claims] 1. A method for propelling a plurality of pipes sequentially arranged in a propulsion direction to define a pipeline by a thrust generated by a main pushing device, wherein a plurality of tubes are relayed to relay the thrust of the main pushing device. The relay means is disposed in the pipe, and the intermediate pressing means is disposed so as to receive thrust from the rear relay means of any two adjacent relay means. A pipe propulsion method including pushing the rear end portion of the relay means in front of the relay means with the intermediate pushing means. 2. The pipe propulsion method according to claim 1, further comprising pushing the excavator with a relay means disposed at the forefront. 3. The foremost pipe is connected to the excavator to prevent the thrust transmitted to the foremost pipe from being transmitted to the excavator while the excavator is being pushed by the foremost relay means. 3. The pipe propulsion method according to claim 2, including maintaining the excavator and the excavator in a disengaged state. 4. The thrust transmitted to the intermediate pipe and the subsequent pipe arranged between the intermediate pipe and the subsequent pipe while the rear end portions are being pressed by the intermediate pressing means is applied to the intermediate pipe. 5. A method as claimed in any one of the preceding claims, including maintaining the two in a disengaged state to prevent transmission to the tube.
Pipe propulsion method described in section. 5. An apparatus for propelling a plurality of tubes sequentially arranged in a propulsion direction to define a pipeline by a thrust generated by a main pushing device, wherein the intermediate pushing device for pushing an intermediate tube among the tubes is provided. The intermediate pushing device includes a plurality of relaying means sequentially arranged in the pipe direction in the propulsion direction to relay the thrust of the main pushing device, and a rearward relaying means of any two adjacent relaying means. A pipe propulsion device comprising: a thrust force from the rear end; and a middle pushing means for pushing a rear end of an arbitrary intermediate pipe and a rear end of a forward relay means of the two relay means. 6. The pipe propulsion device according to claim 5, wherein the foremost relay means is arranged to push the excavator. 7. The first pressing head supported by the rear relay means and extending forward from the rear relay means to press a rear end portion of the front relay means, the intermediate pressing means; 7. The pipe propulsion device according to claim 5, further comprising a second pressing head disposed at a front end of the rearward relay means to press a rear end of the pipe. 8. The second pressing head includes a plurality of claw assemblies arranged at equal angular intervals around an axis of the conduit, wherein each of the claw assemblies is configured to move the intermediate pressing means forward when the intermediate pressing means advances. 8. The tube propulsion device according to claim 7, wherein the tube propulsion device is displaceable to a position for engaging the rear end of the tube and to a position which does not hinder the advancement of a subsequent tube when the intermediate pushing means is removed. 9. Each of the relay means has a cylindrical shape, and the first pressing head moves the claw assembly from the front end of the rear relay means to a center side of the conduit. 9. The pipe propulsion device according to claim 8, wherein the pipe propulsion device extends forward and bypasses.