JP2837394B2 - Pipe propulsion machine - 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 device which is installed in a ground by excavating and pushing the ground by rotating a steel pipe itself.

[0002]

2. Description of the Related Art As an example of a construction method when a steel pipe buried in the ground to lay a transmission line underground or a steel pipe used as a sheath of a sewer pipe is installed in the ground, the steel pipe itself is used as an example. There is a method in which the ground is excavated and pushed forward while rotating, and installed in the ground. In this method of propulsion installation of a steel pipe, a pipe propulsion device that pushes the base end of the steel pipe while pressing it against the ground while rotating it is used.

[0003] As a specific procedure for propulsion installation of a steel pipe using the pipe propelling apparatus, as shown in FIG. 5, is first installed pipe propulsion machine 1 starting pit H The starting pit with drilling _S H _S drilling arrival pit H _E on either side of. Then, the frame 2 of the tube propulsion device 1 is fixed to the bottom of the starting shaft H _S , and the tube propulsion device 1 is installed, and the chuck 3 rotatably provided on the tube propulsion device 1 grips the base end of the steel pipe 4. while rotating about its central axis Te, pressed against the ground G _a toward the tip of the steel tube 4 in one arrival pit H _E, go to promote steel pipe 4 while excavating the ground G _a. In the course of this steel pipe propulsion, it will successively extended shirttail a new steel pipe steel pipe 4, placing the steel pipe to the ground G _a from the starting pit H _S until one arrival pit H _E. Next, the pipe propulsion device 1 is
° Turn and install, and start shaft H
Placing the steel tube 4 in the ground G _b from _S to the other arrival pit H _E. If the propulsion installation of the steel pipe is performed in this way, there is an advantage that a large-scale earthwork such as excavation of the ground along the installation position of the steel pipe is not required.

[0004]

On the other hand, if the steel pipe is propelled and installed as described above, the center axis of one of the steel pipes installed first and the center axis of the other steel pipe installed thereafter are shifted. Since they must be matched, high installation accuracy is required when installing the tube propulsion device. In particular, when a steel pipe is used as a sewage pipe, it is necessary to make the steel pipe have a slight slope, so that higher installation accuracy is required. For this reason, the installation and reversal work of the pipe propulsion device was troublesome, and the construction period was prolonged.
In addition, there is a request from the site to reduce the size of the starting shaft, which was conventionally excavated to a size of about 2000 to 3000 mm in diameter. However, if the starting shaft is reduced in size, it becomes more difficult to reverse the pipe propulsion device. There was a problem of becoming.

The present invention has been made in view of the above circumstances, and provides a pipe propulsion device capable of rotating and propelling a pipe toward both sides, thereby realizing a shortened work period for pipe installation work. It is intended to be.

[0006]

According to a first aspect of the present invention, there is provided a tube propulsion device having two rotating mechanisms for gripping a base end of a tube and rotating the tube around a center axis thereof. Mechanisms are arranged to direct the tubes to be gripped in opposite directions and align the central axes of both tubes, and reciprocate these two rotating mechanisms in the aligned central axis directions of the tubes. And a moving mechanism for causing the moving mechanism.

In this pipe propulsion machine, one of the rotating mechanisms grips and rotates the pipe, moves it toward one of the reaching shafts, excavates the ground, installs the pipe, and then moves the other rotating mechanism to the other rotating mechanism. By moving the new pipe toward the other reaching shaft while gripping and rotating the pipe, and installing the pipe while similarly excavating the ground, the axes of both pipes can be set to coincide. Further, after the steel pipe installation on one ground is completed, there is no need to turn the pipe propulsion unit to the other ground side, so that the construction period can be shortened as compared with the related art.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A tube propulsion device according to the present invention will be described with reference to FIGS. The pipe propulsion device 10 shown in FIGS. 1 and 2 is provided with a frame 20 according to the size of the start shaft H _S to be installed inside the start shaft H _S excavated on the ground. The frame 20 includes a pair of main frame members 21 spaced apart in parallel and a connecting member 22 for connecting both ends of the main frame members 21 to each other. The main frame member 21 is located at the bottom of the starting shaft H _S. , Which are fixed to a propulsion device support (not shown) installed in the vehicle.

A double rod type double acting cylinder 3 is provided on the frame 20 as a moving mechanism for reciprocating a rotating mechanism which will be described later.
0 are arranged between the main frame members 21 in parallel with them.
The rod 31 constituting the double rod type double acting cylinder 30
Are fixed to a rod support member 23 which is fixed close to and parallel to the connecting member 22. The double-acting cylinder 32 is mounted on the rod 31 with the rod 31 inserted inside. This double-acting cylinder 32 has a piston partition wall 31a provided at the center of the rod 31.
Oil chambers for receiving the supply of the working fluid are provided on both sides of the cylinder. When the working fluid is supplied to one of these oil chambers, the double-acting cylinder 32 can reciprocate along the rod 31. .

The double-acting cylinder 32 is fixed to a slide base 40 that slides using the main frame member 21 constituting the frame 20 as a guide, and the slide base 40 reciprocates with the reciprocating movement of the double-acting cylinder 32. It has become.

A casing 41 is fixed to the slide base 40, and the casing 41 is provided with two rotation mechanisms 50. These two rotation mechanisms 50
A chuck 51 for gripping the base end of the steel pipe 4 and a hydraulic motor 52 for rotating the chuck 51 about the central axis of the gripped steel pipe 4 are provided. The chucks 51 provided in the two rotation mechanisms 50 project from opposite sides of the casing 41 in opposite directions, and are arranged such that the rotation axes of the chucks 51 are aligned.
Moreover, the direction of this rotation axis is double rod type double acting cylinder 3.
Arranged direction of the rod 31 constituting the 0, namely is set parallel to the reciprocating direction of the slide base 40, while held by the both chucks 51 steel pipe 4 _a, 4 _b is rotated in the rotational axis direction You can move forward (or backward).

A hydraulic motor 52 is provided on each of the chucks 51, and the rotational force of the hydraulic motor 52 is
The rotation of the chuck 51 is transmitted to the chuck 51 via 3. As shown in FIG.
A steel pipe gripping portion 54 is provided which projects from the annular portion 51a having a larger diameter than the steel pipe toward the center thereof from three directions. At the tip of the steel pipe gripping part, a pressure contact part 55 which is pressed against the side surface of the steel pipe and directly supports the steel pipe is provided. In addition, out of these three steel pipe gripping parts, the projection length of the two steel pipe gripping parts 54a is set in advance in consideration of the size of the steel pipe 4 to be gripped, and the projecting length of the remaining steel pipe gripping parts 54b is set at the site. The steel pipe 4 is gripped by changing it.

The metal crown 5 attached to the tip of the steel pipe 4 has a structure in which a cutter bit 5a for excavating the ground is disposed on the tip face of the metal crown 5, and the cutter bit 5a is rotated and propelled by the steel pipe 4. The ground is excavated.

According to the steel pipe propulsion unit 10 configured as described above, was placed a steel pipe 4 _a with drilling ground by moving while rotating by gripping the steel pipe 4 _a in one rotational mechanism 50, subsequently installed to match the axes of both the steel pipe 4 _a, 4 _b by installing a new steel pipe 4 _b with excavating ground while rotating by gripping a new steel pipe 4 _b to the other rotation mechanism This is also effective when installing a steel pipe with a gradient.

Next, using the above-described pipe propulsion device 10, the steel pipe 4
The construction procedure for installing the fins in the ground will be described with reference to FIG.
First, starting pit H _S inside arranged pipe propulsion unit 10, both sides of the arrival pit H installed to be arranged direction of the steel tube 4 between the _E,
It is fixed in consideration of the gradient. Next, slide base 40
The after having previously moved away from one of the ground G _a installing a steel pipe 4 _a, to grip the steel tube 4 _a chuck 51 which faces the ground G _a. Then, the slide base 40 while rotating the steel pipe 4 _a is advanced toward the ground G _a, propelling the steel tube 4 _a while drilling it. When steel pipe 4 _a gripped by the chuck 51 is substantially inserted into the ground G _a, once retract the slide base 40 is removed from the chuck 51, the steel tube 4 _a 'for extension is gripped by the chuck 51 is already ground G _a
To match the central axis to the inserted steel tube 4 _a to be coupled with. As a connection method in this case, welding, joining with screws, or the like is employed. After connecting the steel pipes, excavation of the ground Ga is started again. Incidentally, sediment caused by drilling out recap was sprayed from a nozzle provided on the end face of the metal crown 5 high-pressure water to Kiriha surface, to flow into the steel tube 4 in _a as mud. Muddy water mixed with sediment flowing into the steel pipe 4 _a is sucked by the installed pump inside the steel pipe. The work of extending the steel pipe 4 _a ′ is repeated so that the steel pipe 4 of _a predetermined length is
After installing, remove the steel pipe 4 from the chuck 51,
Chuck 51 which will be facing the other ground G _b to be drilled
A new steel pipe _4b is gripped. In this later go ahead and similar work other ground G _b installing steel tube 4 of a predetermined length.

If the steel pipe 4 is installed in accordance with the above-described procedure, it is not necessary to perform the reversing operation of the tube propulsion device 10. Therefore, the installation operation that requires strict alignment of the tube propulsion device accompanying the reversing operation is eliminated. The construction period can be shortened as compared with the related art. In addition, a steel pipe having a desired length can be installed underground by adding and extending the steel pipe 4.

In the present embodiment, the double-rod double-acting cylinder 30 is used as the moving mechanism, but a moving mechanism of a type in which the slide base is driven by an electric motor may be used instead. Further, the specifications of the hydraulic motor for rotating the chuck, the type of the means for holding the steel pipe, and the like are selected in consideration of the size of the steel pipe, the condition of the ground at the site, and the like.

[0018]

As described above, according to the pipe propulsion device of the first aspect, the ground is moved by moving one of the rotating mechanisms toward one of the reaching shafts while gripping and rotating the pipe. By placing the pipe while excavating, and then moving the other rotating mechanism toward the other reaching shaft while gripping and rotating the new pipe, and similarly placing the pipe while excavating the ground, both sides Can be installed so that the axes of the tubes are aligned. In addition, since it is not necessary to perform a strict alignment for the reversing installation work of the propulsion device, the construction period can be shortened as compared with the related art.

[Brief description of the drawings]

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

FIG. 2 is a plan view of the tube propulsion device shown in FIG.

FIG. 3 is a side view showing a chuck for gripping a pipe in the pipe propulsion apparatus shown in FIGS. 1 and 2;

FIG. 4 is a state explanatory view showing a procedure for installing a steel pipe in the ground using a pipe propulsion machine.

FIG. 5 is a state explanatory view showing a procedure for installing a steel pipe in the ground using a conventional pipe propulsion machine.

[Explanation of symbols]

4 steel 10 tube propulsion units 30 both rod type double acting cylinder 50 rotating mechanism 51 chucks G _a, G _b Ground H _S starting pit H _E arrival pit

Claims (1)

(57) [Claims] The present invention has two rotating mechanisms for gripping a base end of a tube and rotating the tube around a center axis thereof, and the two rotating mechanisms are arranged so that the tubes to be gripped are in opposite directions. And a moving mechanism for reciprocating the two rotating mechanisms in the direction of the center axis where the two tubes coincide with each other. Thruster.