JP2000240393A - Pipe jacking device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To pull back a pipe jacking body while contriving the damage protection of the pipe jacking body and the safety maintenance of a working environment by setting the retreat limit of the rear end position of the pipe jacking body on the receiv ing base of the pipe jacking body and obstructing retreat on and after the retreat limit. SOLUTION: When a pipe jacking body 20 is pulled back, a receiving base 7 is pushed back in the case where the rear end 22 of the pipe jacking body 20 is brought into contact with the locking body of the receiving base 7 of the pipe jacking body until it reaches the end point of a pull back stroke. Furthermore, a retreat limit 10 operates a retreat limit switch 15 positioned on a retreat limit L, and the retreat operation of a drive mechanism 3 is stopped. The sandwiching of the pipe jacking body 20 is opened, the drive mechanism 3 is advanced and operated to advance a clamp mechanism 2, and, if the interconnection of the pipe jacking body 20 is released, it can be shifted to a next pull back process. Thus, the retreat limit L is prevented from pushing for the rear side wall part of the pit P of the pipe jacking body 20, and an interval is provided to be set between the pipe jacking body and the rear side wall part 34. Thereby a worker can be protected from such an accident that he is caught between the pulling back pipe jacking body 20 and the rear side wall part 34.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a propulsion device,
Specifically, a clamp mechanism that is disposed in a pit excavated on the ground, is movable in the pushing direction of the propulsion body, and can clamp and release the propulsion body, in order to sequentially connect and push the propulsion body in the device, The present invention relates to a propulsion device including a drive mechanism capable of reciprocally driving the clamp mechanism, and a propulsion body receiving base on which a subsequent propulsion body that is added to the pushed propulsion body can be temporarily placed.

[0002]

2. Description of the Related Art In a conventional propulsion device, as shown in FIG.
So that the propulsion body 20 can be sequentially connected and pushed in the device.
The propulsion body 20 is movable in the pushing direction of
A clamp mechanism 2 that can be opened, a drive mechanism 3 that can reciprocate the clamp mechanism 2,
The propulsion body receiving base 7 is provided so that the following propulsion body 20 to be added to 0 can be temporarily placed. The driving mechanism 3 is shown in FIG.
As shown in FIG. 1, a pair of reciprocating hydraulic cylinder mechanisms each having a pair of clamp guides 1 fixedly attached to an apparatus base 31 of a propulsion device 30 in the pushing direction of the propulsion body 20 as piston rods. 4. The clamp mechanism 2 is mounted so as to straddle both hydraulic cylinder mechanisms 4 and includes a hydraulic cylinder device. The clamp mechanism 2 is provided movably with respect to the device base 31 that surrounds the hydraulic cylinder mechanism 4 together. A lower chuck piece 2a fixed to a lower portion of the casing, and an upper chuck piece 2b vertically driven by the hydraulic cylinder device.
The upper chuck piece 2b pressed down by hydraulic pressure
Between the propulsion body 20 and the lower chuck piece 2a.
Is configured to be held. Soil guide tube 5
Is fixed to the device base 31 by being sandwiched between guide tube clamps 6 provided on the device base 31 in front of the clamp mechanism 2 (see FIG. 5).

As shown in FIG. 12, the above-described propulsion device 30 has fixed jacks 32 as front and rear jacks 32B and 32A at the front and rear of a device base 31, and the rear jack 32A extends forward and backward. To fix the position in the pit P. As shown, the rear jack 32A is configured to be bent upward for convenience of installation. The direction in which the propulsion body 20 is pushed may not be horizontal. For this reason, the device base 31 has front and rear folding legs 3.
3 (see FIG. 10). When the propulsion body 20 is to be propelled upward, the folding legs 33
When only the front folding leg 33A of the folding leg 33A is to be set up and propulsion is to be performed downward, only the rear folding leg 33B of the folding leg 33 is set up. Further, in order to adjust the height between the bottom of the pit P and the position where the propulsion body 20 is pushed, both or one of the two folding legs 33 is set to one.
It can also be set at 0 °. When the posture of the device base 31 is determined, with the front jack 32B fixed, the position and direction of the underground guide tube 5 are adjusted, the rear jack 32A is extended, and the device base 31 is pressed forward. Then, the soil guide pipe 5 is pushed into the soil in front of the pit P.

[0004] As shown in FIG.
It is formed in a tubular shape, and has a front end portion 21 formed with a male screw portion 21a, and a rear end portion 22 provided with a cap nut 23. The front and rear propulsion bodies 20 are externally threaded portions 21a of the rear propulsion body 20.
Is screwed together with the cap nut 23 of the front propulsion body 20 and tightened to connect and push. An operation cable 27 for operating the propulsion head 24 disposed at the head is inserted into the inside of each of the propulsion bodies 20, and the propulsion heads 24 are connected to each other with the propulsion heads 24 at the head. It is wrapped around the take-up frame 28 (see FIG. 7). As shown in FIG. 14, the propulsion head 24 is provided with a head 25 having an inclined surface portion 25a inclined with respect to the propulsion direction, which is rotatable relative to the main body around an axis X thereof. is there. The propulsion head 24 includes a driving device for rotating the head 25 and a transmitter for notifying the position to the outside. The operation cable 27 includes an electric wire, a hydraulic pipe and a signal for the operation. Built-in wire.

In the propulsion device 30, first, the propulsion head 24 is mounted on the propulsion body receiving table 7, the clamp mechanism 2 is retracted, and the upper and lower chuck pieces 2a, 2b
When the driving mechanism 3 moves the clamp mechanism 2 forward while holding the propulsion head 24 therebetween, the propulsion head 24 is pushed into the soil via the soil guide tube 5.
When one press-in stroke is pushed in, the clamp mechanism 2 releases the holding of the propulsion head 24 and retreats the clamp mechanism 2. When the pushing operation of the propulsion head 24 is repeatedly performed and the rear end portion 26 of the propulsion head 24 reaches a predetermined position, the first propulsion body 20 is placed on the propulsion body receiving table 7 and the propulsion head The cap nut 26a at the rear end 26 of the propulsion head 24 is screwed into the male thread 21a of the propulsion body 20, and the rear end 2
6 and the front end 21 of the first propulsion body 20.
The clamp mechanism 2 is retracted again to clamp the propulsion body 20, and the driving mechanism 3 pushes the propulsion body 20 into the soil. When one press-in stroke is pushed in, the propulsion body 20
Is released, and the clamp mechanism 2 is retracted. The pushing operation of the propulsion body 20 is repeatedly performed, and when the rear end portion 22 of the propulsion body 20 reaches a predetermined position, the second propulsion body 20 is placed on the propulsion body receiving base 7 and the first propulsion body 20 is placed. The cap nut 23 of the rear end portion 22 of the propulsion body 20 is screwed into the male screw portion 21a of the second propulsion body 20, and
The front end 21 and the rear end 22 are connected. Similarly,
By repeating the above operation, the rear end 2 of the preceding propulsion body 20
While connecting the front end 21 of the propulsion body 20 following 2
Although the propulsion body 20 is sequentially pushed, the reaching distance of the propulsion head 24 is estimated from the total number of strokes of the drive mechanism 3 that pushes and drives the clamp mechanism 2.

The propulsion body 20 is pushed into a target point, and when the head 25 is exposed, the leading end 29a of a pipe material 29 for a new pipe to be drawn into the ground is moved to the head 25 of the propulsion head 24. After connecting to the propulsion device 3
0, the propulsion body 20 is pulled back, thereby pulling the pipe material 29 for the newly installed pipe into the ground. At the time of this retraction, an operation reverse to the above-described pushing operation is performed, and the clamp mechanism 2 is operated to pull back the propulsion body 20 one by one. When one propulsion body 20 is pulled back, the cap nut 23 of the rear end portion 22 of the propulsion body 20 remaining in the subsequent soil is removed while the propulsion body 20 is temporarily placed on the propulsion body receiving stand 7, and the The propulsion body 20 is wound around the winding frame 28 together with the pulled back operation cable 27. By pulling back the propulsion head 24, the leading end 29a of the pipe material 29 is
When it comes to the inside, the propulsion head 24 is removed from the pipe member 29 and returned to the winding frame 28, and the pipe member 2
The pull-in process of No. 9 is completed.

[0007]

As described above, the propulsion body 20 is sequentially pulled back. In the above-described conventional propulsion device, the clamping mechanism 2 applies the operating force in the pulling direction to the propulsion body 20 in the soil. And pull it out. Since the clamp mechanism 2 is operated with a constant stroke even when the propulsion body 20 is pulled out, if the position of the rear end portion 22 of the propulsion body 20 at the end point of the withdrawal stroke of the clamp mechanism 2 shifts, the aforementioned The rear end 22 may be pressed against the rear wall 34 of the pit P. As described above, the operation cable 27 passes through the inside of the propulsion body 20 and is connected to the winding frame 28. Therefore, the operation cable 27 is connected to the rear end portion 22 of the propulsion body 20 and the pit. If the operation cable 27 is sandwiched between the rear wall 34 and the rear wall 34 of the P, the operation cable 27 may be damaged. Further, when the rear end portion 22 is strongly pressed against the rear side wall portion 34, earth and sand is pushed into the inside of the tubular propulsion body 20, which requires removal work. In some cases, the winding operation of the roller 20 may be hindered. Therefore, the propulsion device of the present invention solves the above-described problems, and provides means that enables the propulsion body to be pulled back while protecting the propulsion body from damage while maintaining a safe working environment. Aim.

[0008]

Means for Solving the Problem [First characteristic configuration] A first characteristic configuration of the propulsion device according to the present invention for the above object is as follows. The present invention is characterized in that a limit position setting means capable of setting a retreat limit of a rear end position and a propulsion body retraction preventing means for preventing a rear end position of the propulsion body from retreating after the retraction limit are provided. [Function and effect of first characteristic configuration] According to the first characteristic configuration, since the rear end of the propulsion body does not retreat after a predetermined position, the rear end of the propulsion body is pushed into the soil. And the operating cable penetrating the propulsion body can be simultaneously protected from damage. That is, since the retreat limit of the rear end position of the propulsion body can be set, by operating the propulsion body retraction prevention means, the rear end of the propulsion body does not retreat after the retraction limit, so A necessary space can be secured between the pit and the rear wall. Therefore, there is no possibility that the rear end of the propulsion body is pushed into the soil, and there is no possibility that the operation cable is caught between the rear end of the propulsion body and the rear wall of the pit. Further, if the space necessary for ensuring the safety of the worker is maintained, the worker can be prevented from being erroneously caught between the propulsion body and the rear wall of the pit, and can contribute to ensuring the safety for the worker. .

[Second feature configuration] A second feature configuration of the propulsion device of the present invention for the above purpose is as described in claim 2, wherein the retreat limit of the rear end of the propulsion body in the first feature configuration. The limit position setting means is provided by providing a retreat limit switch that responds to the arrival of the propulsion body, and the propulsion body retreat prevention means is configured to stop the retreat operation of the drive mechanism with the operation of the retreat limit switch. On the point. [Function and Effect of Second Feature Configuration] According to the second feature configuration, while the function and effect of the first feature configuration are exhibited, the retraction limit switch is set so that the propulsion body is pulled back by the drive mechanism after the retraction limit. Therefore, it is possible to safely perform the pull-in operation of the newly installed pipe while preventing damage to the propulsion body and the operation cable without monitoring by an operator.

[Third characteristic configuration] According to a third characteristic configuration of the propulsion device of the present invention for the above purpose, the propulsion body receiving base in the second characteristic configuration can be moved back and forth freely. In addition, the propulsion body receiving stand is provided with a locking body that can be locked at the rear end of the propulsion body, and a retreat limit that can operate a retraction limit switch at a predetermined position. The point is that it is structured. [Function and effect of third characteristic configuration] According to the third characteristic configuration, the propulsion body retraction preventing means can be operated in a state where the extracted propulsion body is placed on the propulsion body receiving stand, and the operator can operate the propulsion body backwardly. You will be able to work easily.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An example of an embodiment of the propulsion device of the present invention will be described below with reference to the drawings. FIG. 1 is an exploded perspective view of a propulsion body pedestal in an example of a propulsion device according to the present invention, and FIG. 2 is a longitudinal sectional view of a propulsion body pedestal showing an example of a propulsion body retraction preventing means according to the present invention. FIG. 3 is an exploded perspective view of the underground guide tube, FIG. 4 is an explanatory view showing a state in which the propulsion head is pushed into the soil, and FIG. 5 is a front view illustrating the installation of the underground guide tube. 6
FIG. 7 is a plan view of an installed state showing an example of the propulsion apparatus according to the present invention, FIG. 7 is an explanatory view of a state where the propulsion body of the propulsion apparatus shown in FIG. 6 is pushed, and FIG. 8 is a propulsion apparatus shown in FIG. FIG. 4 is an explanatory view of a state where a buried pipe is retracted. Note that the same elements as those described in the related art and elements having the same functions are denoted by the same reference numerals as those in FIGS. 10 to 14, and a part of the detailed description is omitted. .

As shown in FIG. 6, the propulsion device is disposed in a pit P excavated on the ground, and is movable in the pushing direction of the propulsion body 20 so as to sequentially connect and push the propulsion bodies 20 in the device. A clamp mechanism 2 capable of holding and releasing the propulsion body 20, a drive mechanism 3 capable of reciprocatingly driving the clamp mechanism 2, and a subsequent propulsion body 20 which is added to the pushed propulsion body 20. And a propulsion body receiving stand 7. The propulsion device 30 is provided with a retraction preventing mechanism 11 for preventing the pushed-in propulsion body 20 from retreating when the propulsion body 20 is pushed in. The receding prevention mechanism 11 is made of, for example, a rubber plate 12 provided on the inner surface 5a of the underground guide tube 5, as shown in FIG. The thickness of the rubber plate 12 is set so as to be slightly coaxial with the underground guide tube 5 and protrude inside a virtual cylindrical surface C having the same diameter as the propulsion body 20. By doing so, the propulsion body 2 is placed in the soil guide pipe 5.
When 0 is inserted, the rubber plate 12 is compressed and sheared in the pushing direction of the propulsion body 20 (see FIG. 4). As a result, the restoring force of the rubber plate 12 acts on the propulsion body 20 as an axial force,
The propulsion body 20 is sandwiched in the underground guide tube 5. In FIG. 4, the outer shape of the rubber plate 12 before inserting the graphic head 24 is indicated by a dashed line.
With this configuration, it is possible to always prevent the propulsion body 20 from retreating when the propulsion body 20 is pushed.

The propulsion body 20 is connected to a head 25 of a propulsion head 24 at a target point by connecting a head portion 29a of a pipe material 29 for a new pipe to be drawn into the ground, and then a clamping mechanism of the propulsion device 30 is formed. 2 and the operation of the driving mechanism 3 are reversed,
By pulling back the propulsion body 20, as shown in FIG.
The pipe material 29 is drawn underground. The propulsion head 24
When the leading end 29a of the pipe member 29 comes into the pit P, the propulsion head 24 removed from the pipe member 29 is returned to the take-up frame 28, and the pipe member 29 is retracted. Ends.

In order to prevent the propelling body 20 from returning too much and hitting the rear side wall 34 of the pit P when the propelling body 20 is pulled back, the propelling body 20 on the propelling body receiving stand 7 is moved backward. The limit position setting means 14 for freely setting the retreat limit L of the end position, and the rear end position of the propulsion body 20 are:
There is provided a propulsion body retreat preventing means 13 for preventing retreat after the retreat limit L. The limit position setting means 14
The device base 3 reacts with the rear end portion 22 of the propulsion body 20 reaching the retreat limit L as shown in FIG. 2, for example.
Reverse limit switch 1 fixed so that its position can be changed to 1
5. As shown in FIG. 1, the propulsion body receiving base 7 has a concave cross section as viewed in the axial direction of the propulsion body 20 to be mounted, and has a front end 7 a which is allowed to escape downward, and a rear end 7 b which has A locking body 8 is provided at the rear end 22 of the propulsion body 20 provided with a U-shaped notch. The propulsion body pedestal 7 is provided with an urging means 9 for attaching the propulsion body pedestal 7 forward while simultaneously attaching the propulsion body pedestal 7 to the device base 31 so as to be movable back and forth. Further, the propulsion body receiving stand 7 is provided with a retreat limit 10 for operating the retreat limit switch 15 when the locking body 8 reaches the retreat limit L (see FIG. 2). The prevention means 13 is connected to the reverse limit switch 15
Is configured to stop the retreat operation of the drive mechanism 3 with the operation of.

With the above arrangement, when the propulsion body 20 is pulled back, the rear end portion 22 of the propulsion body 20 comes into contact with the locking body 8 of the propulsion body receiving stand 7 before reaching the end point of the retraction stroke. In this case, as shown in FIG. 2 (b), the propulsion body receiver 7 is pushed back, so that the retreat limit 10 provided for this is aligned with the retreat limit L set by the limit position setting means 14. Back limit switch 15
To stop the retreat operation of the drive mechanism 3. Therefore, it is possible to prevent the rear end portion 22 of the propulsion body 20 from retreating beyond the retreat limit L. Here, the clamping of the propulsion body 20 by the clamp mechanism 2 is released, and the drive mechanism 3 is released.
When the clamp mechanism 2 is advanced and the connection of the propulsion body 20 is released, the next retraction step can be performed. As described above, since the rear end portion 22 of the propulsion body 20 does not retreat beyond the retreat limit L, the propulsion body 20 is not pressed against the rear wall portion 34 of the pit P,
If the retreat limit L is set with an interval provided between the retraction limit L and the rear side wall portion 34, the propulsion body 20 is retracted by the operator.
An unexpected accident such as being caught between the rear side wall portion 34 and the rear side wall portion 34 can be completely prevented.

Next, another embodiment of the present invention will be described. <1> In the above embodiment, an example is described in which the rubber plate 12 provided on the inner surface 5a of the underground guide tube 5 constitutes the retraction preventing mechanism 11.
May be constituted by other means, and the retraction preventing mechanism 11 may not be provided. <2> In the above embodiment, the limit position setting means 1
4 has been described as an example in which the retreat limit switch 15 responds to reaching the retreat limit L of the rear end portion 22 of the propulsion body 20, but the limit position setting means 14 may be other means, for example, A sensor that detects the rear end portion 22 of the propulsion body 20 may be used. This sensor may be a proximity sensor such as a magnetic sensor or an ultrasonic sensor that detects the arrival of the rear end portion 22, or a position detection sensor such as a light reflection sensor, a contact sensor, or a magnetic sensor. You may. <3> In the above embodiment, the propulsion body cradle 7
Although the example in which the retreat limit 10 for operating the retreat limit switch 15 when the locking body 8 reaches the retreat limit L has been described, for example, as shown in FIG. May be provided with a retreat limit switch 15 that operates when it contacts. The description of the rear end portion 22 of the propulsion body 20 is described in the description of the propulsion head 2
The same applies to the rear end 26 of the fourth. <4> In the above-described embodiment, the locking member 8 that can be locked to the rear end 22 of the propulsion body 20 having the U-shaped notch formed in the rear end 7b of the propulsion body receiving base 7. However, the locking member 8 projects upward from the rear end portion 7b of the propulsion body receiving base 7 and can be brought into contact with the cap nut 23 of the propulsion body 20. It may be formed as. <5> In the above embodiment, the propulsion body receiving base 7 is
Although the example in which the propulsion body receiving base 7 is attached to the apparatus base body 31 so as to be movable back and forth has been described, the locking body 8 that projects upward from the bottom of the propulsion body receiving base 7 is fixed in front and rear. It may be provided so as to be able to move back and forth with respect to the propulsion body receiver 7. It is even better if the locking body 8 is urged forward.

In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the configuration shown in the attached drawings.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a main part showing an example of a propulsion body retraction preventing means according to the present invention.

FIG. 2 is an operation explanatory view for explaining a propulsion body retraction preventing means shown in FIG. 1;

FIG. 3 is an exploded perspective view showing a main part of the propulsion device according to the present invention.

FIG. 4 is a side view showing a main part of the propulsion device according to the present invention.

FIG. 5 is a front view showing a main part of the propulsion device according to the present invention.

FIG. 6 is a plan view showing an example of a propulsion device according to the present invention.

FIG. 7 is a side view illustrating a use state of the propulsion device shown in FIG. 6;

FIG. 8 is a side view illustrating a use state of the propulsion device shown in FIG. 6;

FIG. 9 is a side sectional view of a main part showing another example of the propulsion body retraction preventing means according to the present invention.

FIG. 10 is a side view showing the use state of the propulsion device in the pit.

FIG. 11 is a rear cross-sectional view of the propulsion device.

FIG. 12 is a perspective view of an example of a propulsion device.

FIG. 13 is a longitudinal sectional view showing an example of a propulsion body.

FIG. 14 is a partially cutaway side view showing an example of the propulsion head.

[Explanation of symbols]

 Reference Signs List 2 clamp mechanism 3 drive mechanism 7 propulsion body receiving stand 8 locking body 10 retraction limit 13 propulsion body retraction prevention means 14 limit position setting means 15 retreat limit switch 20 propulsion body 22 propulsion body rear end P pit

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Masaya Hattori 1-1-1, Hama, Amagasaki-shi, Hyogo Prefecture Inside Kubota Research & Development Laboratory Co., Ltd. (72) Inventor Takashi Togawa 1-1-1, Hama, Amagasaki-shi, Hyogo Stock (72) Inventor Yukishige Yamada 1-1-1 Hama, Amagasaki-shi, Hyogo F-term in Kubota Technology Development Laboratory Co., Ltd. 2D054 AC18 AD32

Claims (3)

[Claims] 1. A propelling body (20) is disposed in a pit (P) excavated on the ground, and is movable in a pushing direction of the propelling body (20) so as to sequentially connect and push the propelling body (20) in the apparatus.
A clamp mechanism (2) capable of holding and releasing the propulsion body (20), a drive mechanism (3) capable of reciprocatingly driving the clamp mechanism (2), and a subsequent mechanism to be added to the pushed-in propulsion body (20) A propulsion device comprising a propulsion body support (7) on which the propulsion body (20) can be temporarily placed, the retreat limit of the rear end position of the propulsion body (20) on the propulsion body support (7) Limit position setting means (14) that can freely set
A propulsion device provided with propulsion body retraction preventing means (13) for preventing a rear end position of the propulsion body (20) from retreating after the retraction limit. 2. A limit position setting means (14) comprising a retreat limit switch (15) responsive to the rear end (22) of the propulsion body (20) reaching the retreat limit. The propulsion device according to claim 1, wherein the propulsion body retraction preventing means (13) is configured to stop the retreat operation of the drive mechanism (3) in response to the operation of the retreat limit switch (15). 3. The propulsion body pedestal (7) is configured to be movable back and forth, and is capable of being locked to the propulsion body pedestal (7) at the rear end (22) of the propulsion body (20). 3. The propulsion body retraction preventing means (13) is provided with a locking body (8) and a retraction limit (10) capable of operating the retraction limit switch (15) at a predetermined position. Propulsion device.