JPH11287087A - Jacking method of pipe in ground, and jacking device for pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and a device, by which a pipe longer than the maximum extending distance of the pushing-out section of a jacking device can be jacked efficiently. SOLUTION: The jacking device 26 is installed at a specified place, the pipe 20 is connected to the pushing-out section 24 of the jacking device through an axial-force member 32, the jacking device is operated and the pushing-out section is extended, and the pipe is jacked into the ground. When the pushing-out section of the jacking device is extended at a specified extending distance shorter than the overall length of the pipe, the operation of the jacking device is stopped, the connection of the axial-force member and the pipe is separated, and the pushing-out section of the jacking device is shrunk at a specified distance and the axial-force member is extracted. The front end section of the axial-force member and the pipe are coupled, the jacking device is worked and the pushing-out section is elongated, and the pipe is jacked in the ground through the axial-force member.

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 a propulsion apparatus, and more particularly to a propulsion method and a propulsion apparatus which can be applied when propelling a small-diameter pipe into which the human cannot enter.

[0002]

2. Description of the Related Art When a small-diameter pipe is propelled underground, a propulsion device having an extrudable portion that can be extended and reduced is installed in a shaft, and a pipe to be propelled is connected to the extruded portion to give an axial force.
It is propelled from the shaft into the ground.

[0003]

The unit pipes to be propelled are required to reduce the work of connecting the unit pipes to each other, to improve the sealing performance of the connecting portions, and to increase the rigidity of the pipes embedded in the ground. Therefore, it is preferable that the length be as long as possible. However, in practice, the length of the unit pipe is limited by the maximum extension distance of the push-out portion of the propulsion device, that is, the stroke, and special measures have been required to propel the pipe having a length longer than the stroke. That is, when the propulsion of one stroke is completed, the connection between the tube and the extruded portion is separated, the extruded portion is once reduced, and a member that functions as a spacer is connected to the extruded portion and the tube. Promote the pipe. However, it takes time to separate and connect the above members, so that the workability of pipe propulsion is poor.

The present invention provides a method and apparatus for efficiently propelling a pipe longer than the maximum extension distance of the extruded portion of the propulsion device.

[0005]

SUMMARY OF THE INVENTION The present invention is a method for propelling a pipe underground by a propulsion device having an extensible push-out portion. First, the propulsion device is installed at a predetermined position. Prior to the installation of the propulsion device, during or after the installation, the axial force member that can be inserted into the pipe, and that can be pulled out of the pipe is inserted into the pipe, and the pushing unit of the installed propulsion device is inserted into the push-out unit. The axial force member inserted into the tube is separably connected.
Then, the propulsion device is operated to extend the extruded portion, and propell the pipe into the ground. The operation of the propulsion device is stopped when the pushing portion of the propulsion device extends a predetermined extension distance shorter than the entire length of the tube. Thereafter, the pushing portion of the propulsion device is reduced by a predetermined distance, the axial force member is pulled out of the pipe, and the pulled-out axial force member and the pipe are detachably connected. Then, the propulsion device is operated to extend the extruded portion, and the tube is propelled into the ground via the axial force member.

[0006] An axial force member is inserted into the pipe, and the axial force member is detachably connected to an extruding portion of the propulsion device to propel the pipe. When the extruded portion has been extended a predetermined extension distance shorter than the entire length of the tube, typically a stroke of the extruded portion, the operation of the propulsion device is stopped, the extruded portion is reduced, and the axial force member is withdrawn from the tube. The reduced distance of the extruded portion may be equal to the stroke or shorter than the stroke. Thereafter, the drawn-out axial force member and the pipe are separably connected, and then the pipe is propelled into the ground via the axial force member.

After the tube is propelled by the maximum extension distance of the extruded portion, the axial force member inserted into the tube is pulled out by reducing the extruded portion, and then the tube and the axial force member are connected. The operation of separating the member from the extruded portion or connecting the member to the extruded portion each time can be omitted. Thereby, the workability of pipe propulsion can be improved. Further, after the axial force member is drawn out, the axial force member and the pipe are connected and the pipe is propelled, so that a pipe longer than a predetermined extension distance of the pushing portion of the propulsion device can be propelled into the ground. As described above, since a long unit pipe can be propelled, the connection work between pipes can be reduced, and the rigidity of the pipe can be increased.

[0008] Since the axial force member inserted into the tube is connected to the extruded portion, thereby supporting the tube, the structure for supporting the tube is simplified. In addition, since the axial force member is inserted into the pipe, there is no need to secure a space for the axial force member at the installation location of the propulsion device, and the circumference of the pipe can be kept clean. Thereby, workability and safety can be improved. In addition, the installation location of the propulsion device, for example, the shaft, can be made smaller than that of a conventional device in which a member that functions as a spacer is interposed.

When the pipe is propelled underground, it is preferable that the pipe be propelled underground while rotating the pipe.

[0010] When the pipe is propelled underground, the pipe is rotated and propelled, whereby the pipe can be prevented from swaying and can be accurately propelled. Further, friction between the pipe and the ground can be reduced.

An apparatus for propelling a pipe underground according to the present invention includes a jack having a pushable portion that can be extended and contracted, and an axial force member that can be inserted into the pipe and can be pulled out of the pipe. This axial force member is separably connected to the pushing portion of the jack.

The propulsion method is carried out by connecting the axial force member inserted into the pipe to the push-out portion of the jack in a separable manner.

The propulsion device comprises a jack and an axial force member, and can have a simple structure. Further, since the pipe can be supported by the axial force member, a special support structure is not required. In the past, in order to propel the unit pipe as long as possible, a special jack with a larger stroke of the propulsion device was used, but according to the present invention, a unit pipe longer than the jack stroke can be propelled. A normal jack can be used.

It is preferable that the jack has a mechanism for rotating the tube.

Since the jack has a rotating mechanism in addition to the pipe pushing mechanism, the jack can be easily propelled by applying a thrust and a rotating force to the pipe to be propelled.

[0016] It is preferable that the mechanism for rotating the push-out portion has a function of extending the push-out portion.

Since the extension and rotation of the push-out portion are performed by the same mechanism, the propulsion device can have a simple structure.

In the case where the jack has a rotating mechanism, the propulsion device may include a mechanism between the pushing portion and the axial force member for blocking rotation transmitted from the pushing portion of the jack to the axial force member. it can.

When the tube is to be propelled, it is generally preferred to rotate the tube, but in special cases only thrust may be transmitted to the tube. According to this aspect of the invention, both can be selected.

[0020] Preferably, said axial force member has at least two axially spaced two-face width portions, and said tube has a through hole at a rear end. The propulsion device,
A fork having a bifurcated fork inserted into the two-width portion and a cotter having a pin inserted into the through hole is provided.

First, the axial force member and the pipe are connected to each other by using the rear portion of the two flat portions of the axial force member, and the pipe is propelled. Thereafter, the axial force member and the pipe are connected by using the front two-plane width portion, and the pipe is propelled. According to this axial force member, the unit pipe can be propelled into the ground by two extension of the jack. Since the axial force member and the pipe can be connected only by inserting a cotter, and can be separated only by removing the cotter, workability of connection and separation can be greatly improved.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIGS. 1 to 6 which show an embodiment using an axial force member, a method of propelling a pipe 20 into the underground 22 includes a propulsion device having an extensible extrudable portion 24. 26 drives the tube 20. The pipe 20 is, for example, a sheath pipe made of steel pipe. After the sheath pipe is propelled into the ground, a resin water pipe is inserted into the inside of the sheath pipe, or the sheath pipe is used as it is as a protection pipe for the electric cable. At this time, the present invention is particularly effective. 1 to 6, the pipe 2
0 is indicated by a virtual line.

First, the propulsion device 26 is installed at a predetermined position. The propulsion device 26 is, in the embodiment shown, mounted on a shaft 28 and rests on a frame 30.

Prior to installation of the propulsion device 26, during or after installation, an axial force member 32 that can be inserted into the tube 20 and that can be pulled out of the tube 20 is inserted into the tube 20. The axial force member 32 is formed so as to be shorter than the pipe 20 but longer than the stroke of the pushing portion 24 of the propulsion device 26. It is preferable to attach a steady rest 34 to the distal end portion of the axial force member 32, and to closely contact the inner peripheral surface of the tube 20 to prevent the tube 20 from swinging.

Next, the axial force member 32 inserted into the pipe 20 is detachably connected to the push-out portion 24 of the installed propulsion device 26. In the illustrated embodiment, since the connection blocking mechanism 36 is connected to the pushing portion 24 of the propulsion device 26,
The axial force member 32 is connected to the connection breaking mechanism 36.

When the tube 20 is propelled, a conical head 38 may be attached to the tip of the tube to be propelled first.
The invention will be implemented when it reaches a predetermined position.

After the axial force member 32 is connected to the push-out portion 24, the push-out portion 24 is extended by operating the propulsion device 26 while receiving the reaction force by the reaction force receiving plate 27, and as shown in FIG. To the underground 22. At this time, the extruding part 24
Is formed so as to slide on the frame 30, and further, the distal end portion of the tube 20 is preferably supported by the slider 40 (FIG. 1). Thereby, the extruded portion 24 and the pipe 20
Can be prevented. Slider 40 is frame 3
It slidably rests on the top 0 and moves forward with the tube 20. Then, when the tube 20 moves forward by a certain distance, it falls from the frame 30. When the axial force member 32 and the tube 20 are inserted into the tube 20 as shown in FIG.
It is preferable that the connecting means 42 be connected so as to be separable in the vicinity of the connection blocking mechanism 36.

When the propulsion device 26 is operated, and as shown in FIG. 2, when the pushing portion 24 of the propulsion device extends a predetermined extension distance shorter than the entire length of the tube 20, for example, the stroke of the pushing portion 24, Stop operation. Tube 2
0 is, for example, a length of 600 to 700 mm, and the stroke of the propulsion device can be set to 300 to 400 mm.

After the operation of the propulsion device 26 is stopped, the pushing portion 24 of the propulsion device 26 is reduced by a predetermined distance, and the axial force member 32 is pulled out from the tube 20, as shown in FIG. The reduced distance of the propulsion device 26 need not be the same as the stroke. Based on the length of the tube 20 and the predetermined extension distance, the contraction distance is previously obtained by determining how many times the tube 20 is to be propelled to a predetermined position. When the axial force member 32 and the pipe 20 are connected by the connecting means 42, the connecting means 42 is detached before the pushing portion 24 is reduced, and the axial force member 32 and the pipe 20 are separated.

After the axial force member 32 has been pulled out, as shown in FIG. 3, the pulled-out axial force member 32 and the pipe 20 are separably connected by the connecting means 42 at the distal end portion of the axial force member 32.

After the axial force member 32 and the tube 20 are connected by the connecting means 42 at the distal end portion of the axial force member 32, the propulsion device 26 is operated to extend the push-out portion 24, and the tube is connected via the axial force member 32. Promote 20 underground. As a result, the pipe 20 is propelled a predetermined length into the underground 22 as shown in FIG.

Thereafter, as shown in FIG.
The connection between the axial force member 32 and the pipe 20 is separated, and the propulsion device 26 is operated to return the pushing portion 24 to the start position in FIG. Then, as shown in FIG. 6, the axial force member 32 and the connection blocking mechanism 36 are separated, the axial force member 32 is set in a free state, and this is inserted into the pipe 20 to be propelled next. afterwards,
The axial force member 32 is connected to the connection blocking mechanism 36, and the above process is repeated.

In carrying out the method, it is preferable to propel the pipe 20 underground while rotating it. For this purpose, the push-out portion 24 is configured to be rotatable, and this rotation is transmitted to the axial force member 32 via the connection / interruption mechanism 36, and the axial force member 32
Rotates the tube 20.

The apparatus 26 for propelling the pipe 20 into the ground includes a jack 50 having a push-out portion 24 that can be extended and contracted, and an axial force member 32 that can be inserted into the pipe 20 and can be pulled out of the pipe 20. The axial force member 32 is the extruded portion 2
4 is separably connected.

In the embodiment shown in FIG. 7 in a sectional view, the axial force member 32 has two two-width portions 52 which are spaced apart in the axial direction. In the embodiment shown in FIG.
2 is shown, and a cotter 42 as a connecting means is attached to a rear two-plane width portion. Double width 52
Is a circular cross section, as shown in FIG.
It is a form that is cut in three aspects. On the other hand, the tube 20 has a through hole 54 at the rear end. Where the unit tubes 20 are screwed together, the tube 20 has an external thread at the front end and an internal thread at the rear end. The through hole 54 passes through the inner screw.

As shown in FIGS. 10A and 10B, the cotter 42 has a bifurcated fork 56 inserted into the two-plane width portion 52 and a pin 5 inserted into the through hole 54 of the pipe 20.
8 When the fork 56 is inserted into the two-width portion 52 of the axial force member 32 and the pin 58 is inserted into the through hole 54 of the tube 20, the axial force member 32 and the tube 20 are separably connected. When the pipe 20 is rotated, the screw 60 is passed through the fork 56 to prevent the
Screwed in. A handle 62 is attached to the cotter 42,
At the time of attachment and detachment, the handle 62 is grasped.

The portion of the axial force member 32 to be inserted into the tube 20 is shorter than the tube 20,
It is formed of a steel pipe so as to be longer than the stroke of No. 4, and is formed by welding a steel material only to the two-plane width portion 52, and a steady rest 34 is attached to the tip end. The steady rest 34 is a ring whose outer peripheral surface is rounded and chamfered, and is pressed into the axial force member 32. The steady rest 34 is connected to the pipe 20.
And close to the inner peripheral surface of the tube to prevent the runout of the pipe 20.

When the head 38 is used, the head 38 can be connected by the cotter 42. That is,
A through hole 64 is formed in the head 38 and the pin 58 of the cotter 42 is
Into the through hole 64 to connect the head 38 in a separable manner.

The axial force member 32 is connected to the push-out portion 24 of the propulsion device 26 via a connection blocking mechanism 36 in the illustrated embodiment. The connection breaking mechanism 36 includes two yokes 7
2,74. The yoke 70 at the rear end of the axial force member 32 is fitted to the yoke 72 by taper surface fitting.
The pins 76 are inserted into the yokes 70 and 72, and the yokes 7
0 and 72 are non-rotatably connected. Further, the yoke 72 is fitted to the yoke 74, and the pin 78 is connected to both the yokes 7.
2, the two yokes 72, 74 are connected so as not to rotate. A thrust bearing 80 is disposed between the yoke 72 and the yoke 74, and a pin 78 is provided.
The yoke 72 is rotatable with respect to the yoke 74 in a state where the is removed. Both pins 76 and 78 are prevented from coming off by split pins 82. The yoke 74 is connected to the tip portion 25 of the extruded portion by a bolt 84. As a result, when the pin 78 is kept inserted, the rotation of the pushing portion is transmitted from the yoke 74 to the yoke 72, and the axial force member 32 rotates. However, when the pin 78 is kept in the removed state, the rotation of the push-out portion is transmitted to the yoke 74, but the axial force member 32 does not rotate because the yoke 74 rotates with respect to the yoke 72.

When the tube 20 is not rotated, the yoke 70 of the axial force member 32 is connected to the tip portion 25 of the extruded portion via the yoke 86 as shown in FIG. That is, the yoke 70 is fitted to the yoke 86 by taper surface fitting, the pins 88 are inserted to connect the two yokes 70, 86 so that they cannot rotate, and the yoke 86 is connected to the distal end portion 25 of the extruded portion by the bolt 84. I do.

Referring to FIG. 8, which shows a sectional view of the jack 50, the jack 50 includes a base 90, a screw mechanism 92, the push-out portion 24, and thrust means 94 for applying thrust.

The base 90 is made of a steel plate, is non-rotatably fixed to the reaction force receiver 27 (FIG. 1), and is responsible for the reaction force of the propulsion device.

The screw mechanism 92 is a ball screw mechanism, and as is known per se, a nut 96 having a ball rolling groove and a passage for feeding the ball from one end to the other end.
And a threaded rod 98 having a ball rolling groove and being fitted to the nut 96. The ball is disposed in the passage of the nut and the ball rolling groove. Screw rod 98 is key 1
00, it is non-rotatably connected to the base 90, and is fixed to the base 90 by screwing a nut 102 into its end.

The extruded portion 24 is formed of a cylindrical steel pipe.
It is non-rotatably connected to a nut 96 by a spline connection, and is disposed around a screw rod 98.
That is, in the state where the illustrated extruded portion 24 is the most reduced, the extruded portion 24 is formed so as to surround the screw rod 98 over a sufficient length.

The thrusting means 94 engages with the nut 96 so that the nut 96 of the screw mechanism can rotate with respect to the thrusting means 94. The thrusting means 94 includes a cylindrical cylinder 104 disposed around the pushing portion 24, It comprises a thrust plate 106 welded to the tip of 104 and two hydraulic cylinder devices 108.

An inward flange 105 is provided at the rear end of the cylinder 104, and a screw 110 is screwed into the flange 105. Screw 110 is retainer 1
12 and is engaged with the thrust bearing 114. When the cylinder 104 moves in the axial direction, the screw 11
0 pushes the retainer 112 and the nut 96 moves in the axial direction. At the same time, the nut 96 rotates around the screw rod 98 because the nut 96 is engaged with the screw rod 98 via the ball.

The thrust plate 106 is fixed to a large-diameter halved ring 118 by bolts 120,
Reference numeral 18 is fitted in an annular groove 122 provided in the extruded portion 24 together with the small-diameter split ring 116 so as to be rotatable with respect to the annular groove 122 and not to be movable in the axial direction. The piston rods 109 of the two hydraulic cylinder devices 108 are connected to the thrust plate 106, and the cylinder ends of the hydraulic cylinder devices 108 are fixed to the base 90.

As a result of forming the thrust means 94 as described above, when the hydraulic cylinder device 108 is operated and the piston rod 109 is pushed out, the thrust plate 106 receives a thrust, and this thrust is transmitted from the thrust plate 106 through the cylinder 104 to the bolt 1
Affected by 10. The nut 96, which receives the thrust from the bolt 110, moves in the axial direction and simultaneously rotates around the screw rod 98. Then, the extruded portion 24 becomes the nut 9
It is pushed forward while rotating with 6. At this time, since the thrust plate 106 and the pushing portion 24 are rotatable, the thrust plate 106 moves in the axial direction without hindrance, and the pushing portion 24 moves in the axial direction while rotating without hindrance.

Extruded portion 24 extended to a predetermined extension distance
The hydraulic cylinder device 108 is operated in reverse to retract the piston rod 109. At this time, since the split ring 118 fits into the annular groove 122 of the pushing portion 24 and cannot move in the axial direction, the pushing portion 24 is returned by the thrust transmitted from the thrust plate 106 to the split ring 118. .

In the above embodiment, the ball screw mechanism is used as the screw mechanism. Alternatively, a screw mechanism similar to a quick-turning screw mechanism having a larger screw lead may be used.

[Brief description of the drawings]

FIG. 1 is a side view showing one process of a propulsion method according to the present invention.

FIG. 2 is a side view showing another process of the propulsion method according to the present invention.

FIG. 3 is a side view showing still another process of the propulsion method according to the present invention.

FIG. 4 is a side view showing still another process of the propulsion method according to the present invention.

FIG. 5 is a side view showing a state where the propulsion device has returned to the initial position after completing the propulsion method according to the present invention.

FIG. 6 is a side view showing a process of continuing the propulsion method according to the present invention.

FIG. 7 is a sectional view mainly showing an axial force member of the propulsion device according to the present invention.

FIG. 8 is a sectional view mainly showing a jack of the propulsion device according to the present invention.

9 is a sectional view of an axial force member that can be used in place of the axial force member shown in FIG.

10A and 10B show a cotter and a two-plane width portion, wherein FIG. 10A is a front view of the cotter, FIG. 10B is a side view of the cotter, and FIG. 10C is a cross-sectional view of the two-plane width portion.

DESCRIPTION OF SYMBOLS 20 Pipe 24 Pushing part 26 Propulsion device 32 Axial force member 36 Connection blocking mechanism 42 Connection means (cotter) 50 Jack 52 Two-plane width portion 54 Through hole 56 Fork 58 Pin 70, 72, 74 Yoke 90 Base 92 Screw mechanism 94 Thrust means

Claims (7)

[Claims] 1. A method for propelling a pipe underground by a propulsion device having an extensible extrudable portion, comprising: installing the propulsion device at a predetermined position; Or after installation
Inserting an axial force member that can be inserted into the tube and that can be pulled out from the tube into the tube, and detachably connects the axial force member inserted into the tube to the pushing portion of the installed propulsion device. Actuating the propulsion device to extend the push-out portion and propel the pipe into the ground; when the push-out portion of the propulsion device extends a predetermined extension distance shorter than the entire length of the pipe, Stopping the operation of the propulsion device; thereafter, reducing the pushing portion of the propulsion device by a predetermined distance to pull out the axial force member from the tube; and allowing the pulled-out axial force member and the tube to be separated. Coupling, actuating the propulsion device to extend the extruded portion, and propelling the tube into the ground via the axial force member;
How to propel a pipe underground. 2. Propelling the pipe underground while rotating it.
A method for propelling a pipe according to claim 1 into the ground. 3. An apparatus for propelling a pipe into the ground, comprising: a jack having a pushable portion that can be extended and contracted; and an axial force member that can be inserted into the pipe and can be pulled out of the pipe. And an axial force member detachably connected to the pushing portion. 4. The pipe propulsion device according to claim 3, wherein the jack includes a mechanism for rotating the pushing section. 5. The pipe propulsion device according to claim 4, wherein the mechanism for rotating the extruded portion performs a function of extending the extruded portion. 6. The propulsion device includes a mechanism between the pushing portion and the axial force member for blocking rotation transmitted from the pushing portion of the jack to the axial force member.
A pipe propulsion device according to claim 4 or 5. 7. The axial force member has at least two axially spaced dihedral portions, the tube has a through hole at a rear end, and the propulsion device includes The pipe propulsion device according to claim 3, further comprising a cotter having a forked fork inserted into the width portion and a pin inserted into the through hole.