JP2000282781A - Initial portion pressing apparatus for pipe jacking method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an initial portion pressing apparatus for pipe jacking method, which is obtained by improving a member which carries out a function as a strut. SOLUTION: The initial portion pressing apparatus for pipe jacking method comprises a base 26, two hydraulic cylinder apparatuses 28 arranged with a horizontal interval therebetween, and a pressing member 30 which is fixed to cylinders of the respective hydraulic cylinder apparatuses 28 and is movable on the base. The initial portion pressing apparatus includes two auxiliary pressing members 44, 46 which are mounted on the pressing member 30 in a horizontally movable manner in a direction orthogonal to a moving direction of the pressing member 30, and arranged in the interval between the two hydraulic cylinder apparatuses 28. These two auxiliary pressing members 44, 46 can be in contact with an end surface of a pipe and the pressing member 30 when they are moved in directions that approach each other, while they are arranged in axially external locations when they are moved in directions that separate each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a main pushing device for pipe propulsion, and more particularly, to a small-diameter pipe that cannot be entered by a person.
The present invention relates to a main pushing device suitable for propulsion while balancing the earth pressure of the ground and the muddy water pressure.

[0002]

2. Description of the Related Art Two hydraulic cylinder devices having a base having a reaction force receiving member, a cylinder and a rod extendable with respect to the cylinder, wherein one of the cylinder and the rod is fixed to the reaction force receiving member. Pipe propulsion, comprising: two hydraulic cylinder devices arranged at intervals in the horizontal direction; and a pushing member fixed to the other of the cylinder and the rod of the hydraulic cylinder devices and movable on the base. There is known a main pushing device for use (for example, Japanese Patent Publication No. 5-29758). This main pushing device is arranged in the starting shaft.

A device for applying mud pressure to the propulsion head that has reached the face of the ground and propelling while balancing the mud pressure and the earth pressure at the face is a hose for supplying mud and a hose for discharging excavated earth and sand. Extends from the propulsion head toward the rear. These hoses, especially when the pipes are small diameter pipes, are passed through the unit new pipe when connecting the pipe to be propelled next to the unit length, i.e., the unit new pipe, with the pipe already propelled underground at the start shaft. , It is necessary to pull out from the back of the unit new tube. However, in order to propel the unit new tube together with the already propelled tube, a thrust must be exerted on the end face of the unit new tube. Therefore, for example, a member called a cylindrical strut having a slit is disposed between the pushing member and the end face of the unit new pipe, and a thrust is applied to the unit new pipe via the strut, and a hose or the like is connected to the slit of the strut. From behind.

[0004]

When the unit new tube is to be propelled, the strut is disposed between the unit new tube and the pushing member. However, it is necessary to remove the strut when the unit new tube has been propelled. This is because when the unit new tube to be propelled next is guided to a predetermined position, it cannot be guided if there is a strut. And the strut arrangement and removal work at that time are easily separated depending on the size of the starting shaft. In other words, in the case of a starting shaft that can have a space larger than the outer diameter of the pipe to be propelled in the lateral direction perpendicular to the propulsion direction, a plurality of struts are arranged in the propulsion direction beside the pipe to be propelled, Since each strut can be supported so as to be movable in the lateral direction (Japanese Patent Laid-Open No. 3-228998), it is easy to arrange and remove the struts.

On the other hand, in the case of a starting shaft in which a cylindrical casing is buried in the ground, such as a starting shaft in the case of propelling a small-diameter pipe into which a person cannot enter,
From the viewpoint of work efficiency and cost when filling, it is necessary to make the diameter as small as possible. As a result, it is difficult to secure a sufficient space both in the transverse direction perpendicular to the propulsion direction and in the propulsion direction, and it is not easy to arrange and remove struts.

SUMMARY OF THE INVENTION The present invention provides a main pushing device for pipe propulsion, in which a strut can be easily arranged and removed even in a starting shaft where it is difficult to secure a sufficient space.

[0007]

SUMMARY OF THE INVENTION The present invention comprises a pair of propulsion means including a base having a reaction force receiving member and at least one hydraulic cylinder device having a cylinder and a rod extendable with respect to the cylinder. And one of the cylinder and the rod is fixed to the reaction force receiving member,
An original pusher for pipe propulsion, comprising: a pair of propulsion means arranged at right and left intervals in the horizontal direction, and a push member fixed to the other of the cylinder and the rod of these propulsion means and movable on the base. Device.

In one aspect of the invention, at least two auxiliary pushing members are attached to the pushing member so as to be movable in a horizontal direction perpendicular to the moving direction of the pushing member, and are arranged within a space between the pair of propulsion means. Is provided. When these auxiliary pushing members move toward each other, they can come into contact with the end surface of the tube and the pushing member, and when they move away from each other, they are located radially outward of the tube, and It is formed so as to avoid interference.

The at least two auxiliary push members are preferably pivotable about a horizontal axis, in which case they assume a use position in front of the push member and a non-use position above the push member. .

[0010] It is preferable that the at least two auxiliary pushing members are cantilevered on a horizontal axis at upper portions thereof.

According to another aspect of the invention, an auxiliary pressing member formed in a cylindrical shape and having a slit, a moving means for moving the auxiliary pressing member in a vertical direction, and a support attached to the pressing member and supporting the moving means. And The auxiliary pushing member is located within the space between the pair of propulsion means when moving downward, and is formed so as to be able to contact the end face of the tube and the pushing member.

[0012] Preferably, the moving means is pivotable about a vertical axis of the column.

Preferably, the base includes a guide for guiding the auxiliary pushing member.

[0014]

According to one aspect of the present invention, at least two auxiliary pushing members are movable in a horizontal direction perpendicular to the moving direction of the pushing members. Some and the rest of the two auxiliary push members are moved, ie one and the other of the at least two auxiliary push members are moved away from each other. After guiding the unit new tube to a predetermined position, when one and the other of the at least two auxiliary pushing members are moved in a direction approaching each other, the at least two auxiliary pushing members can contact the end face of the unit new tube and the pushing member. And preparation for promotion is completed.

According to the present invention, since at least two auxiliary pushing members are movable in the horizontal direction, one and the other of the at least two auxiliary pushing members are moved away from each other and only moved toward each other. Thus, it is possible to dispose the unit new tube at a predetermined position and to promote the unit new tube.

Since each auxiliary pushing member may have a size capable of giving a thrust to the unit new pipe, one and the other of at least two auxiliary pushing members approach each other to form the unit new pipe and the pushing member. The dimensions can be determined so that when contact is possible, there is sufficient clearance between one auxiliary push member and the other auxiliary push member. Therefore, a hose or the like can be pulled backward from this gap. Further, the auxiliary pushing member can be made of a plate material so that the auxiliary pushing member enters into the lateral space between the propelled pipe or the unit new pipe guided to a predetermined position and each of the pair of propulsion means. Therefore, it is not necessary to particularly provide a storage space when the auxiliary pushing member is brought to a non-use position outside in the radial direction of the pipe. Therefore, the present invention
It can secure a small space in the transverse direction perpendicular to the direction of pipe propulsion, and is particularly suitable as a main pushing device used in a starting shaft having a small diameter.

Since the at least two auxiliary pushing members are attached to the pushing member, they can move together with the pushing member without providing a guide or the like.

When at least two auxiliary push members are pivotable about a horizontal axis, the at least two auxiliary push members have a use position in front of the push member and an unused position above the push member. For example, at the time of maintenance or inspection of the main pushing device, operability can be secured by positioning two auxiliary pushing members above the pushing member.

If the at least two auxiliary push members are cantilevered on the horizontal axis at their respective upper portions, the turning operation about the horizontal axis can be performed simply by lifting the at least two auxiliary push members. Also, when bringing at least two auxiliary pushing members to the use position,
The auxiliary pushing member can be kept in a predetermined use position by the weight of the auxiliary pushing member itself.

According to another aspect of the present invention, the unit new pipe can be guided to a predetermined position of the starting shaft by moving the auxiliary pushing member upward. When the auxiliary push member is moved downward, the end face of the unit new tube and the push member can be brought into contact, and preparation for propulsion is completed.

According to the present invention, since the auxiliary pushing member is moved by the moving means, it can be manually arranged,
Eliminating the labor required when removing or eliminating it. In addition, since the auxiliary pushing member is moved up and down, a small space can be secured in a lateral direction orthogonal to the direction in which the pipe is propelled.

When the moving means is pivotable about the vertical axis of the column, the auxiliary pushing member can be brought to the upper side, so that, for example, during maintenance or inspection of the main pushing device,
Workability can be secured.

When the base has a guide for guiding the auxiliary pressing member, the auxiliary pressing member can be accurately guided.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A main pushing device 22 for propelling a pipe 20
Referring to FIG. 1 showing a planar state, FIGS. 2 and 4 showing a side state, and FIG. 3 showing a front state, a base 26 having a reaction force receiving member 24 and one hydraulic cylinder device are respectively provided. And a push member 30.

The base 26 includes two vertical frames 32 spaced apart in the horizontal direction, and these vertical frames 3
2 and is firmly formed by three welded horizontal frames 34, and the reaction force receiving member 24 is
Standing vertically from one end of 6. Vertical frame 32
Is higher than the height of the horizontal frame 34, and the pipe support members 36 are arranged in a space created by the difference in height and are welded to the horizontal frame 34. The propelled tube slides on the tube support member 36. A leveling jack 38 made of a screw material and a nut is attached to the vertical frame 32 of the base 26.

The two hydraulic cylinder devices 28 each have a cylinder 40 and a rod 42 that can extend and contract with respect to the cylinder 40, and are of the same standard. The two hydraulic cylinder devices 28 include one of the cylinder 40 and the rod 42, and in the illustrated embodiment, the rod 42
, And are arranged at intervals in the horizontal direction.
As the hydraulic cylinder device, any hydraulic cylinder device known per se can be used. However, since a large stroke can be secured, a hydraulic cylinder device described later is preferable.

The pushing member 30 applies thrust to the pipe 20, and is fixed to the other of the cylinder 40 and the rod 42 of the two hydraulic cylinder devices 28, in the embodiment shown, and moves on the base 26. The push member 30 is made of a rectangular steel plate as a whole, and the slider 3
One. These sliders 31 ride on the vertical frame 32 of the base 26 and move on the base 26.

Two auxiliary pushing members 44 and 46 are attached to the pushing member 30 so as to be movable in a horizontal direction perpendicular to the moving direction of the pushing member 30. Two auxiliary pushing members 4
4, 46 are arranged within the space between the two hydraulic cylinder devices 28, as shown in FIG. When the two auxiliary pushing members 44 and 46 move in a direction approaching each other, the tube 2
The end surface of the tube 20 and the pushing member 30 can be brought into contact with each other, and are formed so as to be located radially outward of the tube 20 when moving in a direction away from each other, so as to avoid interference with the tube.

In the illustrated embodiment, the auxiliary push members 44, 4
6, the lower part 45 of one auxiliary pressing member 44 and the lower part 47 of the other auxiliary pressing member 46 are bent toward each other by a steel plate, but the upper part is substantially vertical. Is formed. As a result, when moving toward each other, the two auxiliary pushing members 44 and 46 can come into contact with the end face of the tube 20, as shown by the phantom line in FIG. When moving away from each other, as shown by the solid line in FIG.
Can be avoided.

The contact between the two auxiliary push members 44, 46 and the end face of the tube 20 does not extend over the entire circumference of the end face, but rather by a quarter, as is evident from the phantom line in FIG. However, it has been confirmed that this can sufficiently promote the fume tube.

The two auxiliary push members 44 and 46 each have a cylindrical boss 48 in the illustrated embodiment. On the other hand, the cylindrical bracket 50 makes its axis horizontal,
The pressing member 30 is fixed to the center of the pressing member 30 so as to extend in a direction perpendicular to the moving direction of the pressing member 30. Round shaft 52
Are fixed to a cylindrical bracket 50, and the bosses 48 of the auxiliary pushing members 44 and 46 are inserted into the round shaft 52. As a result, the two auxiliary pushing members 44 and 46 can move in the axial direction along the round shaft 52 and can pivot around the round shaft 52. Two auxiliary pushing members 4
The bosses 48 and the round shaft 52 can be shaped other than a circle when the 4, 46 move in the axial direction, but do not need to pivot about the axis.

When the two auxiliary push members 44 and 46 move in a direction approaching each other, the boss 48 of each auxiliary push member abuts against the bracket 50 to prevent the movement, and the auxiliary push members 44 and 46 are attached to the end face of the tube 20. Can be contacted. Conversely, when the two auxiliary push members 44, 46 move in directions away from each other, the respective auxiliary push members 44, 46 abut against the cylinder 40 of the hydraulic cylinder device 28 and are prevented from moving. Is located outside the tube 20. When the two auxiliary pushing members 44 and 46 rotate around the round shaft 52, the auxiliary pushing members 44 and 4 are rotated.
Reference numeral 6 indicates a use position in front of the illustrated push member 30 and an unused position above the push member 30.

As shown, two auxiliary pushing members 44,
46 is a horizontal axis (round shaft) at each upper part
52 support the cantilever. As a result, the auxiliary pushing members 44 and 46 pivot downward around the horizontal shaft 52 due to their respective gravitational forces, and are kept pressed against the pushing member 30. In this embodiment, each auxiliary pushing member 44,
Reference numeral 46 designates a contact plate 54 at a contact portion with the pressing member 30, and the contact plate 54
Is pressed against.

As shown in detail in FIG. 4, the pushing member 30 has a plate 58 supported at its lower end by a stay 56, and a plastic sliding plate 60 having a low coefficient of friction is attached to the plate 58. On the other hand, each auxiliary pushing member 4
At the lower end of 4, 46, a horizontal plate 62 is attached,
Slide on sliding plate 60. This makes it possible to smoothly move the auxiliary push members 44 and 46 in the horizontal direction.

The hydraulic cylinder device 28 is shown in a sectional view in FIG.
With reference to FIG. 2, a rod 42, a cylindrical outer cylinder 40, and a cylindrical inner cylinder 70 are provided. The cylinder 70 performs the function of a piston. The rod 42 has an end 72 connected to the reaction receiving member 24 (FIG. 2) and an end 73 movably inserted into the cylinder 70, and an O-ring 74 is attached to the end 73. I have. End 73
Has an outer diameter substantially equal to the inner diameter of the cylinder 70,
The portion of the rod 42 other than 3 is formed to have an outer diameter smaller than the inner diameter of the cylinder 70. Attach the lid 76 to one end of the cylinder 70 and seal it.
0 from the other end of the rod 42 to the cylinder 7
0 and insert the rod guide 78 into the cylinder 70
The cylinder 70 is hermetically sealed by attaching the rod 42 to the other end, and the rod 42 is movably supported in a sealed state. The cylinder 70 has a partition 80 at an intermediate portion in the axial direction, and an O-ring 81 is attached to the partition 80. The outer diameter of the partition 80 is substantially equal to the inner diameter of the cylinder 40, and the portion of the cylinder 70 other than the partition 80 is formed to have an outer diameter smaller than the inner diameter of the cylinder 40. The partition 80 of the cylinder 70 is inserted into the cylinder 40, and piston guides 82 are attached to both ends of the cylinder 40 to seal the cylinder 40.
0 is movably supported in a sealed state.

The rod 42 has two passages 84, 85 each connected to an external pressure supply. Passage 84
Communicates with a passage 86 defined by the cylinder 70 and the rod 42 on the right side of the end 73 in FIG.
On the other hand, the passage 85 penetrates in the axial direction, and communicates with the hollow portion 87 of the cylinder 70 on the left side of the end 73. Cylinder 7
0 has two passages 88,89. The passage 88 is shown in FIG.
The left side of the partition 80 communicates with the hollow portion 90 of the cylinder 40, and further communicates with the hollow portion 87 of the cylinder 70. On the other hand, the passage 89 communicates with a passage 91 defined by the cylinder 40 and the cylinder 70 on the right side of the partition 80 in FIG. 5, and further communicates with a passage 86 of the cylinder 70.

The hydraulic cylinder device 28 in the contracted state shown in FIG. 5 operates as follows. When the pressure liquid is introduced into the passage 85, the pressure liquid enters the hollow portion 87,
Push 0 to the left. At the same time, since the hollow portion 87 communicates with the passage 88, the pressurized liquid enters the passage 88 and
Reach Here, the dimensions of the lid 76 and the piston guide 82 are determined so that the force exerted on the lid 76 by the pressure of the hollow portion 87 is greater than the force exerted on the piston guide 82 by the pressure of the hollow portion 90. Then, the hollow part 90
The cylinder 40 is pushed to the left by the pressure liquid that has reached. As a result, the cylinder 70 and the cylinder 40 move simultaneously. The movement is such that the rod guide 78 on the cylinder 70 abuts against the rod end 73 and the piston guide 82 on the right end of the cylinder 40.
Stops when it hits the partition 80.

To retract the extended hydraulic cylinder device 28, pressurized liquid is introduced into the passage 84. The pressure liquid passes through passage 8
6 and push the cylinder 70 to the right. At the same time, the pressurized liquid enters the passage 89 and reaches the passage 91 where the cylinder 4
Push 0 to the right. Here, the dimensions of the rod guide 78 and the piston guide 82 are determined so that the force exerted on the rod guide 78 by the pressure in the passage 86 is greater than the force exerted on the piston guide 82 by the pressure in the passage 91.
As a result, the cylinder 70 and the cylinder 40 move simultaneously. The movement stops when the lid 76 strikes the rod end 73 and the piston guide 82 at the left end of the cylinder 40 strikes the partition 80, as shown in FIG.

As shown in FIG. 1, the main pushing device 22 is installed and used in a starting shaft 100. The illustrated start shaft 100 is a cylindrical steel plate casing having a diameter of 2550 mm. To propel the pipe by the main pushing device 22, the following operation is performed. The tube is a fume tube. Referring to FIG. 6 with the pipe 104 already propelled into the underground 102, the hydraulic cylinder device 28 is contracted to return the pushing member 30 to the pushing start position, and the auxiliary pushing members 44 and 46 are manually moved away from each other. Let it. In this state, the propelled pipe 1
A connecting hose 106 is connected to a hose 105 extending from the drilling head, which is drawn from 04. The hose in this case includes a hose for sending and discharging muddy water, a cable, and the like. However, for convenience of explanation, the hose is typically described as one hose. The connecting hose 106 has a unit length almost the same as the unit new tube 108 to be propelled.
To the starting shaft 100 together.

After connecting the connection hose 106, as shown in FIG. 7, the pushing rib 110 is applied to the end face of the unit new tube 108 and the pushing member 30, and the hydraulic cylinder device 28 is extended to make the unit new tube 108 Is connected to the already propelled tube 104.

After connecting the propelled pipe 104 and the unit new pipe 108, as shown in FIG. 8, the hydraulic cylinder device 28 is contracted to return the pushing member 30, and another connection is made to the rear end of the connection hose 106. The hose 107 is connected, and the connection hose 107 as shown in FIG. 9 is raised.

Thereafter, as shown in FIG. 9, the two auxiliary pushing members 44 and 46 are moved in a direction approaching each other. The connecting hose 107 is pulled out from the gap between the two auxiliary pushing members 44 and 46. Prior to the promotion of the unit new pipe 108,
A detachable circular contact wheel 112 is attached to the end face of the unit new tube 108. This is because the cylindrical sealing plate 114 is attached to the end of the unit new tube 108,
14 is deformed when a force is applied thereto, thereby impairing the sealing function. The hydraulic cylinder device 28 is extended to bring the auxiliary pushing members 44 and 46 into contact with the abutment wheel 112, and the hydraulic cylinder device 28 is continuously extended.

In the embodiment shown, the hydraulic cylinder device 28
Has a stroke of 1250 mm. As shown in FIG.
After extending the hydraulic cylinder device 28 for the entire stroke, FIG.
As shown in FIG. 1, the hydraulic cylinder device 28 is contracted, and the pushing member 30 is returned to the pushing start position. Thereafter, the operations of FIGS. 6 to 11 are repeated.

The original pushing device 1 shown in FIG. 12 in a plane state, FIGS. 13 and 14 in a side state, and FIG. 15 in a front state.
22 is a base 126 having a reaction force receiving member 124;
It includes two hydraulic cylinder devices 128 and a pushing member 130 that moves on the base 126. In this embodiment, the reaction force receiving member 124 is in close contact with the starting shaft 132,
Although the planar shape is an arc, the base 126 has substantially the same structure as the base 26, the hydraulic cylinder device 128 has the same structure as the hydraulic cylinder device 28, and the pressing member 130 has substantially the same structure as the pressing member 30. Detailed description is omitted.

The main pushing device 122 is formed in a cylindrical shape, and has an auxiliary pushing member 134 having a slit 133; a moving means 136 for moving the auxiliary pushing member 134 in the vertical direction;
And a support 138 that is attached to the pushing member 130 and supports the moving means 136. When the auxiliary push member 134 moves downward, it is located within the space between the two hydraulic cylinder devices 128, and the end face of the pipe 140 and the push member 130
Is formed so as to be able to contact with. When the auxiliary pushing member 134 moves upward, it becomes the unused position. Therefore, the main pushing device 122 is suitable for use in a small-diameter starting shaft where the space in the lateral direction is small.

As shown in FIG. 15, the auxiliary pushing member 134 is made of a steel pipe and has a substantially cylindrical shape. A pair of sliders 142 is attached to the lower end, and a disk 143 is attached to the side that comes into contact with the pushing member 130. It is formed. The pair of sliders 142 enter the tube support member 144 made of channel steel fixed to the horizontal frame of the base, and the tube support member
4 is used as a guide.

The moving means 136 is a chain block in the illustrated embodiment, but a known spring balancer may be used. Chain block 13
6 is movable along a transverse member 146 extending from the column 138. And, the moving means 136 is a support 138
Can be swiveled about the vertical axis. As shown in FIG. 14, the column 138 is supported by a journal bearing 148 to be pivotable about a vertical axis. As a result, the chain block 136 pivots, and as shown by the phantom line in FIG.
It is moved to the upper side of 0 and to the side.

In order to propel the pipe by the main pushing device 122, after guiding the unit new pipe 140 to a predetermined position, the auxiliary pushing member 134 is moved downward so that it can come into contact with the end face of the pipe 140 and the pushing member 130. . Then, the hose is pulled out from the slit 133 of the auxiliary pushing member 134. Prior to the propulsion, the cylindrical abutment ring 150 is applied to the end face of the tube 140, and the auxiliary pressing member 134 is brought into contact with the end face of the tube via the abutment ring 150. Auxiliary pushing member 134 by moving means
In order to propel while restraining, the chain block 13
The transverse member 146 is made long so that 6 moves together with the auxiliary pushing member 134. It is also possible to release the restraint by the moving means 136 and propell while guiding the auxiliary pushing member 134 with the guide 144.

After the propulsion of the unit new pipe is completed, the hydraulic cylinder device 128 is contracted to push the pushing member 130 and the auxiliary pushing member 1.
34 is returned to the extrusion start position, the auxiliary pushing member 134 is lifted upward by the moving means 136, and the unit new pipe is guided to the starting shaft 132.

In the above embodiment, one propulsion means is formed by one hydraulic cylinder device 28, 128 disposed on the left and right, respectively. Alternatively, two or more hydraulic cylinder devices may be combined into one propulsion means. In the embodiment shown in FIGS. 1 to 11, two auxiliary pushing members 44 and 46 are provided.
The auxiliary pressing member 44 moves from the use position to one side, and the auxiliary pressing member 46 moves from the use position to the other side to be in the non-use position. Instead of this, a total of four auxiliary pressing members, that is, another auxiliary pressing member that performs the same movement as the auxiliary pressing member 44 and another auxiliary pressing member that performs the same movement as the auxiliary pressing member 46 can be provided.

[Brief description of the drawings]

FIG. 1 is a plan view showing an embodiment of a main pushing device for pipe propulsion according to the present invention, wherein an upper half shows a state where a hydraulic cylinder device is contracted, and a lower half shows a state where the hydraulic cylinder device is extended. Is shown.

FIG. 2 is a side view showing an embodiment of a main pushing device for pipe propulsion according to the present invention.

FIG. 3 is a front view of the main pushing device shown in FIG. 2;

FIG. 4 is a side view of an auxiliary pressing member and a pressing member.

FIG. 5 is a sectional view of a hydraulic cylinder device.

FIG. 6 is a plan view showing one operation process of the main pushing device.

FIG. 7 is a plan view showing another operation process of the main pushing device.

FIG. 8 is a plan view showing still another operation process of the main pushing device.

FIG. 9 is a plan view showing still another operation process of the main pushing device.

FIG. 10 is a plan view showing still another operation process of the main pushing device.

FIG. 11 is a plan view showing still another operation process of the main pushing device.

FIG. 12 is a plan view showing another embodiment of the main pushing device for pipe propulsion according to the present invention.

13 is a side view of the main pushing device shown in FIG.

FIG. 14 is a partially cutaway side view showing a state where a pipe is propelled by the main pushing device shown in FIG. 12;

FIG. 15 is a front view in which a part of an auxiliary pushing member is sectioned.

[Explanation of symbols]

 22, 122 Main pushing device 24, 124 Reaction force receiving member 26, 126 Base 28, 128 Hydraulic cylinder device 30, 130 Pushing member 40 Cylinder 42 Rod 44, 46, 134 Auxiliary pushing member 136 Moving means 138 Column

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tsutomu Suzuki 4-31-6 Yoyogi, Shibuya-ku, Tokyo Inside Iseki Development Co., Ltd. (72) Inventor Kazunori Nagasawa 3-27-6 Omori Nishi, Ota-ku, Tokyo (72) Inventor Keiko Sasamori 3-27-6 Omori Nishi, Ota-ku, Tokyo F-term in Nagano Oil Machine Co., Ltd. (reference) 2D054 AC18 AD32 EA03

Claims (6)

[Claims] 1. A pair of propulsion means including a base having a reaction force receiving member, and at least one hydraulic cylinder device having a cylinder and a rod extendable with respect to the cylinder, one of the cylinder and the rod. Are fixed to the reaction force receiving member, and a pair of propulsion means which are horizontally spaced apart from each other, and are fixed to the other of the cylinder and the rod of these propulsion means and are capable of moving on the base. And a main pushing device for pipe propulsion, comprising: At least two auxiliary pressing members, which are capable of contacting the end face of the tube and the pressing member when moving toward each other.
An original pushing device for pipe propulsion, which is located radially outward of the pipe when moving away from each other and is formed so as to avoid interference with the pipe. 2. The at least two auxiliary pushing members,
The main pushing device for pipe propulsion according to claim 1, wherein the pushing device is rotatable around a horizontal axis, and takes a use position in front of the push member and an unused position above the push member. 3. The at least two auxiliary pushing members,
The main pushing device for pipe propulsion according to claim 2, wherein the upper portion is cantilevered on a horizontal axis. 4. A pair of propulsion means including a base having a reaction force receiving member, and at least one hydraulic cylinder device each having a cylinder and a rod extendable with respect to the cylinder, wherein one of the cylinder and the rod is provided. Are fixed to the reaction force receiving member, and a pair of propulsion means which are horizontally spaced apart from each other, and are fixed to the other of the cylinder and the rod of these propulsion means and are capable of moving on the base. A main pushing device for pipe propulsion comprising a member, an auxiliary pushing member formed in a cylindrical shape and having a slit, a moving means for moving the auxiliary pushing member in a vertical direction, and being attached to the pushing member, And a supporting column for supporting a moving means, wherein the auxiliary pushing member is located within a space between the pair of propulsion means when moving downward, and an end face of the pipe. A main pushing device for pipe propulsion, which is formed so as to be able to contact the pushing member. 5. The main pushing device for pipe propulsion according to claim 4, wherein said moving means is capable of turning around a vertical axis of said column. 6. The main pushing device for pipe propulsion according to claim 4, wherein the base includes a guide for guiding the auxiliary pushing member.