JP2001182479A - Underground drilling machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an underground drilling machine capable of stably driving it on a driving machine. SOLUTION: An underground drilling machine furnished with a driving machine 2 having a cutter head 1 to drill underground on its front end and devised to sequentially drive and bury a buried pipe 3 by a main pushing jack 5 furnished in the rear of this driving machine 2 is constituted by forming a rear part of the driving machine 2 in a telescopic shape of a front side tubular body 14 and a rear side tubular body 15, installing a plural number of driving jacks 18 to drive the driving machine 2 in the peripheral direction along these front side tubular body 14 and rear side tubular body 15 and arranging these driving jacks 18 in a parallel link shape.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises an excavator having a cutter head for excavating underground at a front end thereof, and a buried pipe is sequentially propelled and buried by a main push jack provided at the rear of the excavator. The present invention relates to an underground excavation machine, for example, an underground excavation machine used in a semi-shield propulsion method or a small-diameter propulsion method.

[0002]

2. Description of the Related Art An underground excavation machine used in a semi-shield propulsion method or a small-diameter propulsion method embeds a pipe while sequentially adding a buried pipe behind an excavator having a cutter head for excavating underground at a front end. Generally, the excavator and the buried pipe are integrally propelled by a rear push jack (or a middle push jack). Therefore, the force applied to the buried pipe from the main pushing jack (middle pushing jack) during propulsion is the sum of the propulsive force applied to the excavator and the resistance to pushing the buried pipe. Further, the torque reaction force of the rotation of the cutter head of the excavator is also transmitted to the buried pipe.

[0003] In these excavators, rolling occurs in the fuselage due to the rotational torque reaction force of the cutter head during excavation. For this reason, when the aircraft rolls, the cutter head excavates while reversing the direction of rotation of the cutter head to correct the rolling.

As another form of the excavator used for the propulsion method, Japanese Unexamined Patent Publication (Kokai) No. 5-209495 and Japanese Unexamined Patent Publication (KOKAI) Heisei
No. 97895 has been proposed, and in the excavators disclosed in these publications, the original pushing jack is used only for propulsion of a buried pipe, and the excavating machine is excavated by a propulsion jack provided in the excavator body. The reaction is performed on the buried pipe.
It is described in the official gazette that the excavation work is performed by repeating a procedure in which the excavator is advanced with respect to the buried pipe by the propulsion jack, and then the buried pipe is advanced by the main pushing jack.

By the way, the excavators disclosed in these two publications have both been proposed to perform curved construction, but the force acting on the buried pipe is smaller than that of the general excavator described above. It can be said that it has the feature that it can be made smaller. In this method, the force acting on the buried pipe is only one of the force transmitted from the excavator generated during excavation (mainly the propulsion reaction force) or the pushing resistance generated when pushing the buried pipe. is there.

Depending on the type of buried pipe, there is a case where it is desired not to apply a load to the buried pipe as much as possible in order to prevent damage to the pipe. However, such a structure can solve the problem to some extent.

[0007]

In the above-mentioned conventional underground excavating machines, in order to correct the rolling of the excavator, an operation for switching the rotation direction of the cutter head is required every time, and the excavating efficiency is reduced. However, there is a problem that the operation is complicated. Therefore, the present invention solves the above-mentioned problem, and can correct (or prevent) the rolling of the excavator without lowering the excavation efficiency, thereby enabling stable excavation. An object of the present invention is to provide an underground excavation machine capable of reducing a load on a buried pipe.

[0008]

A first aspect of the present invention provides an excavator having a cutter head for excavating underground at a front end thereof, and a buried pipe is formed by a main push jack provided at the rear of the excavator. In an underground excavation machine that is to be sequentially propelled and buried, a rear portion of the excavator is formed in a telescopic shape from a front tube and a rear tube, and the excavator is propelled across the front tube and the rear tube. This is an underground excavation machine in which a plurality of propulsion jacks are mounted in the circumferential direction and the propulsion jacks are arranged in a parallel link.

According to the first invention, the front pipe and the rear pipe are connected by a plurality of parallel-link-shaped propulsion jacks arranged in the circumferential direction. The aircraft can be rolled by controlling. Therefore, the rolling of the airframe due to the torque reaction force can be corrected or prevented without switching the rotation direction of the cutter head, and stable excavation can be performed without lowering the excavation efficiency. Further, since the torque reaction force from the front tube to the rear tube is transmitted by the propulsion jack, there is no need to separately provide a member for transmitting torque, and the structure can be simplified.

A second invention is an underground excavation machine according to the first invention, wherein a gripper for applying a reaction force to the ground is attached to the rear pipe.

According to the second invention, when excavating underground,
By fixing the rear tube of the excavator by the gripper, the excavator can be reliably propelled by the propulsion jack, and the rolling force of the excavator and the propulsive force of the excavator can be ground by the gripper. Therefore, the load acting on the buried pipe can be greatly reduced, and breakage of the buried pipe can be reliably eliminated.

A third invention is the underground excavation machine according to the first invention or the second invention, further comprising a thrust detecting means for detecting a thrust by the thrust jack.

According to the third aspect of the present invention, by detecting the propulsion force of the propulsion jack, the propulsion force acting only on the excavator that does not include the sliding resistance of the buried pipe with the ground can be grasped. In addition, the excavator can excavate efficiently while always keeping the propulsion force and the propulsion speed of the excavator optimal.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS As an underground excavating machine, a cutter head 1 for excavating underground is shown in FIG.
Is provided at the front end, and a main push jack 5 is arranged in the starting stand 4. As the excavator 2 advances, the buried pipe 3 is sequentially added to the rear of the excavator 2, and the rear end of the buried pipe 3 is pressed by the main pushing jack 5.

On the other hand, as shown in the detailed explanatory view of FIG. 2A, the excavator 2 has a shield body 7 having a circular pipe shape.
And a circular pipe-shaped spacer tube 8 connected to the rear part of the shield body 7 and accommodating various devices of the excavator 2.

The shield body 7 has a cutter head 1 for excavating underground at a front end thereof, a front body 10 having a cutter head drive motor 9 for rotating the cutter head 1 mounted therein, and a front body 10 A screw conveyor 12 that conveys earth and sand excavated by the cutter head 1 to the rear is attached to the inside of the front body 10 and the rear body 11. Main body 10 and rear main body 1
1, the steering jack 13 is attached at four places in the circumferential direction, and the propulsion direction in the excavator 2 is changed by bending the front body 10 and the rear body 11 with the steering jack 13. Has become.

The spacer tube 8 is connected to a front tube 14 connected to a rear portion of the rear body 11 in the shield body 7.
And the rear tube 1 located behind the front tube 14
5 and the rear tube 1
5 is fitted into the front tube 14 and the rear tube 1
5 is formed in a telescopic shape, so that the front tube 1 is formed.
4 and the rear-side tube body 15 extend and contract. Then, the inner wall 1 having a hollow hole in the inside of the front tube 14
6 as well as an inner wall 17 having a hollow inside the rear side tube 15, and the excavator 2 is propelled across the inner wall 16 of the front side tube 14 and the inner wall 17 of the rear side tube 15. The propulsion jacks 18 are attached at eight locations in the circumferential direction, as shown in the cross-sectional view of FIG. 3, by attaching the front end of the propulsion jack 18 to the rear surface of the inner wall 16 of the front tube 14 and The rear end is the rear tube 15
To the front of the inner wall 17. This propulsion jack 18
Are arranged so that two adjacent jacks 18 are obliquely symmetrical in a substantially C-shape in the circumferential direction, and the whole is arranged in a parallel link shape. In addition, the propulsion jack 18
As shown in the schematic hydraulic circuit diagram of FIG. 2B, a hydraulic pressure gauge 23 for detecting the hydraulic pressure on the head of the propulsion jack 18 is provided. , Eight propulsion jacks 18, and the values measured by the oil pressure gauges 23 are input to a calculator 24. The computing unit 24 computes the propulsion force of the excavator 2 from the measured value of each hydraulic gauge 23 and the inclination of each propulsion jack 18. Although the inclination of each propulsion jack 18 changes with the extension of the propulsion jack 18, in this embodiment,
The calculation is based on the average value (the value when the propulsion jack 18 extends to the middle). This is because the change in the inclination of the propulsion jack 18 is not so large, and the error caused by the change is not so significant. If this error becomes a problem, the calculation may be performed while simultaneously measuring the inclination of each propulsion jack 18. A plurality of stroke gauges (not shown) are provided in the circumferential direction between the front tube 14 and the rear tube 15, and the measured value is input to the calculator 24. , Distance between front tube 14 and rear tube 15, and relative bending angle (posture)
Is calculated. Further, the propulsion speed of the excavator 2 (the front pipe 1
4 and the rear tube 15) are also calculated from the value of the stroke meter. As shown in the cross-sectional view of FIG. 4, four grippers 19 are attached to the rear part of the rear tube body 15 in the circumferential direction to take a reaction force against the ground, and the grippers 19 are cylindrical frame members 20. , The gripper body 21 protrudes toward the ground. A belt conveyor 22 that conveys the earth and sand conveyed by the screw conveyor 12 in the shield main body 7 rearward is disposed inside the front-side tube 14 and the rear-side tube 15 thus configured,
The belt conveyor 22 extends through the inner hole of the inner wall 16 of the front tube 14 and the inner hole 17 of the inner wall 17 of the rear tube 15 and extends to the rear of the excavator 2. Each of the front body 10 and the rear tube 15 is provided with a rolling meter (not shown), and can measure each rolling state individually.

Next, the excavating operation of the underground excavating machine will be described. The original pushing jack 5 arranged in the starting stand 4 abuts on the rear end of the buried pipe 3, and the excavating machine 2 is driven by the original pushing jack 5 through the buried pipe 3.
The rear tube 15 of the spacer tube 8 which is the rear portion is held, and at the same time, the gripper body 21 of the gripper 19 attached to the rear tube 15 of the spacer tube 8 protrudes and strikes against the ground to reduce the reaction force. Take. Thereby, the spacer tube 8
The rear tube 15 is fixed.

In a state where the rear tube 15 of the spacer tube 8 is fixed, the propulsion jack 1 attached to the front tube 14 and the rear tube 15 of the spacer tube 8 is attached.
Extend 8 Thereby, the front tube 1 of the spacer tube 8 is formed.
When the excavator 4 and the shield body 7 move forward to generate a propulsive force, the cutter head 1 at the front end of the shield body 7 excavates underground.

Then, when the propulsion jack 18 reaches the maximum stroke, first, the gripper body 21 is pulled in the gripper 19 attached to the rear tube 11 of the spacer tube 8 and separated from the ground, so that the rear of the spacer tube 8 is removed. Release the fixation of the side tube 15. Then, as shown in the schematic hydraulic circuit diagram of FIG. 2 (b), a relief valve 25 for excavation provided in the hydraulic circuit of the propulsion jack 18 for high excavation and used for excavation and a relief valve for recomposition set for low pressure used for exchanging. 26, the switching is performed by the solenoid valve 27 in the hydraulic circuit so as to use the relief valve 26 for changing the setting of the low pressure. When the main push jack 5 is pushed out and the buried buried pipe 3 is pushed forward, the relief valve 26 for changing the pressure at a low pressure is activated in the hydraulic circuit, so that the relief is performed here. The protruding jack 5 causes the propulsion jack 18 to shrink via the buried pipe 3. Thereby, the rear tube 15 of the spacer tube 8 advances, and the front portion of the rear tube 15 is fitted into the rear inner periphery of the front tube 14. In the above-described embodiment, the propulsion jack 18 is contracted by the main push jack 5, but the operation of the propulsion jack 18 and the operation of the main push jack 5 may be synchronized. By repeating such a process, the excavating operation of the underground excavating machine is performed.

While the excavator 2 is excavating, a torque reaction force is generated due to the rotation of the cutter head 1. This torque reaction force is
The power is transmitted to the front body 10, the rear body 11, and the front pipe 14, and is transmitted to the rear pipe 15 via a parallel link-shaped propulsion jack 18. The excavator 2 tends to gradually roll due to the torque reaction force, but the rolling is corrected by controlling the amount of expansion and the hydraulic pressure of each of the parallel link propulsion jacks 18. The rolling of the airframe is measured by the rolling meters provided on the front tube 14 and the rear tube 15, respectively. The extension amount and hydraulic pressure of each propulsion jack 18 are controlled based on the information from these rolling meters, and the rolling is corrected (or suppressed) by automatic control.

Since the propulsion jack 18 is attached to the spacer tube 8 of the excavator 2 as described above, the propulsion force of the excavator 2 is generated by the propulsion jack 18 instead of the main pushing jack 5. As a result, the force acting on the buried pipe 3 is only one of the force transmitted from the excavator 2 generated during excavation (mainly the propulsion reaction force) and the pushing resistance generated when the buried pipe 3 is pushed. Damage to the buried pipe 3 can be prevented.

Further, since the propulsion jack 18 is arranged in a parallel link on the spacer tube 8 of the excavator 2 as described above, the rotation direction of the cutter head is not changed,
Rolling of the excavator 2 can be corrected or suppressed, and automation is easy. In addition, since the rotational torque reaction force transmitted to the front tube 14 is transmitted to the rear tube 15 by the parallel link propulsion jack 18, there is no need to provide a separate torque transmitting member, and the structure is simplified. Can be.

Also, as described above, the spacer tube 8 of the excavator 2
Gripper 1 for taking a reaction force against the ground on the rear tube 15
Since the gripper 9 is attached, the rear pipe 15 of the spacer tube 8 of the excavator 2 can be fixed by the gripper 19, and the propulsion jack 18 can reliably propel the excavator 2. Moreover, the propulsion reaction force and the cutter rotation torque reaction force generated in the excavator 2 are controlled by the gripper 19.
Therefore, the buried pipe 3 can be reliably prevented from being damaged.

Further, since the propulsion jack 18 is provided with the propulsion force detecting means for detecting the propulsion force or the like, the propulsion force of the excavator 2 is not detected by the main pushing jack 5 but the propulsion force is detected. It is detected at the propulsion jack 18. As a result, when the propulsion force is detected by the main push jack 5 in the conventional underground excavating machine, it is difficult to accurately detect the propulsion force of the excavator 2 due to the outer peripheral frictional resistance generated on the outer periphery of the buried pipe 3. However, by detecting the propulsion force with the propulsion jack 18 attached to the excavator 2, it is possible to detect the propulsion force extremely accurately without being affected by the outer peripheral frictional resistance of the buried pipe 3, and By always properly obtaining the propulsion force and the propulsion speed, the worker can perform the excavation work accurately.

Although the underground excavator according to the present invention has been described in connection with the case where it is used in the semi-shield propulsion method, the present invention is not limited to this. It can be applied to the propulsion method.

[Brief description of the drawings]

FIG. 1 is an overall explanatory diagram of an underground excavator according to the present invention.

FIG. 2 (a) is a detailed explanatory view of an excavator in an underground excavator according to the present invention. (B) It is a schematic hydraulic circuit diagram of the propulsion jack in the underground excavator according to the present invention.

FIG. 3 is a sectional view taken along line AA in FIG. 2;

FIG. 4 is a sectional view taken along line BB in FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Cutter head 2 ... Excavation machine 3 ... Buried pipe 4 ... Starting upstand 5 ... Main pushing jack 7 ... Shield body 8 ... Spacer pipe 9 ... Cutter head drive motor 10 ... Front body 11 ... Back body 12 ... Screw conveyor 13 ... Steering jack 14 ... Front tube 15 ... Back tube 16 ... Inner wall 17 ... Inner wall 18 ... Propulsion jack 19 ... Gripper 20 ... Frame body 21 ... Gripper body 22 ... Belt conveyor 23 ... Hydraulic gauge 24 ... Calculator 25 ... Excavation Relief valve 26 ... Refill relief valve 27 ... Solenoid valve

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Takashi Minami 5 Yokaichi-cho, Komatsu-shi, Ishikawa Komatsu Ltd. Komatsu Plant (72) Inventor Norio Mitani 2-3-6 Akasaka, Minato-ku, Tokyo Co., Ltd. Komatsu Ltd. F-term (reference) 2D054 AC18 AD02 GA64

Claims (3)

[Claims] An excavator (2) having a cutter head (1) at the front end for excavating underground is provided, and a buried pipe (3) is provided by a main push jack (5) provided behind the excavator (2). )
In the underground excavating machine which is to be sequentially buried underground, a rear part of the excavator (2) is formed in a telescopic shape from a front pipe (14) and a rear pipe (15). ) And the rear pipe (15), a plurality of propulsion jacks (18) for propelling the excavator (2) are attached in the circumferential direction, and the propulsion jacks (18) are arranged in a parallel link shape. Underground drilling machine. 2. The underground excavation machine according to claim 1, wherein a gripper (19) for applying a reaction force to the ground is attached to the rear side tubular body (15). 3. The underground excavator according to claim 1, further comprising a thrust detecting means for detecting a thrust by the thrust jack.