JP3244603B2 - Shield 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 multi-cutter shield machine.

[0002]

2. Description of the Related Art Generally, tunnel excavation is performed by a shield machine, and a cutter head is provided with a cutter bit for excavating earth and sand.

[0003] When a hard obstacle exists in the ground, it is difficult to perform cutting with a cutter head of a shield machine. Therefore, conventionally, when such an obstacle is found, the obstacle is removed or entered in front of the shield machine in advance, and the obstacle is removed by an operator.

[0004]

However, in order to remove obstacles in advance, it is necessary to improve the ground in order to ensure the safety of workers, which requires much time and effort. This was causing delays in tunnel construction.

Accordingly, an object of the present invention is to provide a shield machine capable of solving the above problems.

[0006]

In order to solve the above-mentioned problems, a shield machine according to the present invention is arranged such that a sub cutter head is rotatably mounted at the center of a main cutter head rotatably provided at a front portion of a shield body. Along with providing, a plurality of auxiliary cutter heads are rotatably provided on the face plate portion of the annular main cutter head, and at least the auxiliary cutter head is provided so as to be able to move forward and backward from the face plate portion of the main cutter head.
In both cases, if there is an obstacle in the ground,
In such a way that the rod projects forward .

[0007]

According to the above construction, when an obstacle such as a pipe is found, the plurality of auxiliary cutter heads provided on the main cutter head are protruded forward and rotated, so that the obstacle can be easily removed. And it can be cut quickly.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. 1 and 2, reference numeral 1 denotes a multi-cutter shield excavator according to the present invention, and a cutter head 3 is rotatably supported at a front portion of a shield main body 2 via a support 4. As shown in FIG. 1, the support 4 includes a rotary partition 5B which is inserted through a center of an annular partition 5A provided in the shield main body 2 via a swing bearing 6 and supported by the rotary partition 5B. And a plurality of connecting members 7 protruding forward from the portion 5B. Of course, the cutter head 3 is connected to the tip of each of the connecting members 7. The cutter head 3 is rotated by a rotary drive unit via a ring gear 8 formed on an outer ring (or an inner ring) of a swing bearing 6 provided at a rear end of the support 4 and a pinion 9 meshed with the ring gear 8. (For example, a hydraulic motor or an electric motor is used).

As shown in FIGS. 1 and 2, the cutter head 3 includes an annular main cutter head 11 having the same outer diameter as the shield main body 2, and a main cutter head 1 having an annular shape.
A sub-cutter head 12 rotatably inserted into a center hole 11a formed on one side;
A plurality of small-diameter auxiliary cutter heads 13 are rotatably inserted into, for example, four at 90-degree intervals in one face plate portion 11b, and these auxiliary cutter heads 12 and auxiliary cutter heads 13 are respectively provided with a main cutter. The cutter heads 12 and 13 are provided with roller cutters 14 and 15 for cutting obstacles such as pipes, respectively. I have.

The sub-cutter head 12 is provided in the center hole 11a of the main cutter head 11 so as to be able to move back and forth, and is provided on the side of the main cutter head 11 to move the cylindrical body 21 back and forth. A retracting device (not shown, for example, a hydraulic cylinder or the like is used) and a face plate portion 23 rotatably provided on the cylindrical body 21 via a swivel bearing 22
And a rotary drive device (for example, a hydraulic motor, an electric motor, or the like is used) 26 that rotates a ring gear 24 formed on an outer ring portion (or an inner ring portion) of the slewing bearing 22 via a pinion 25. I have.

The auxiliary cutter head 13 is provided at a predetermined position of the face plate portion 11b of the main cutter head 11 so as to be able to move back and forth. A retracting device (not shown, for example, a hydraulic cylinder or the like is used) for retracting, a face plate portion 33 rotatably provided on the cylindrical body 31 via a slewing bearing 32, and an outer ring portion of the slewing bearing 32 And a rotation drive device (for example, a hydraulic motor or an electric motor is used) 36 that rotates a ring gear 34 formed on the (or inner ring portion) via a pinion 35.

Further, the auxiliary cutter head 13 is arranged along the radial direction of the main cutter head 11 so that when the main cutter head 11 makes one rotation, the range over the entire length in the radial direction can be excavated. They are staggered. For example, as shown in FIG. 1, the two auxiliary cutter heads 13A and 13B are provided near the outer periphery of the main cutter head 11 and one of the remaining two auxiliary cutter heads 13C.
To the center, and the other auxiliary cutter head 13D
Are arranged near the inner circumference.

Therefore, in the above configuration, when performing normal excavation, the sub cutter head 12 and the auxiliary cutter head 13 are retracted, that is, in a state where the sub cutter head 12 and the auxiliary cutter head 13 are flush with the face plate portion 11b of the main cutter head 11. The cutter head 3 may be rotated.

When an obstacle such as a pipe is found in the ground, the auxiliary cutter head 12 and the auxiliary cutter head 13 (in some cases, only the auxiliary cutter head may be protruded) are moved by a predetermined stroke S. Protruding forward only [shown in the position (a) in FIG. 1], and the face plate portion 2
By rotating the rollers 3, 33, obstacles such as pipes can be cut by the roller cutter 15 (14).

By the way, the arrangement of the auxiliary cutter head 13 in the above embodiment is two near the outer periphery, one in the middle,
Although one is arranged near the inner circumference, for example, as shown in FIG.
One piece (13A) near the outer circumference, one piece (13B) in the middle, and two pieces (13C, 13D) near the inner circumference may be arranged. As shown in FIG. 4, two pieces (13A, 13A, 13
B), two (13C, 13D) may be arranged near the inner periphery.

[0016]

As described above, according to the structure of the present invention, when an obstacle such as a pipe is found, a plurality of auxiliary cutter heads provided on the main cutter head are projected forward and rotated. Thereby, the obstacle can be easily and quickly cut. That is, it is safer and the work efficiency can be greatly improved as compared with the conventional case where the operator removes the work.

[Brief description of the drawings]

FIG. 1 is a sectional view of a shield machine according to an embodiment of the present invention.

FIG. 2 is a front view of a cutter head of the shield machine in the embodiment.

FIG. 3 is a front view of a cutter head of a shield machine according to another embodiment of the present invention.

FIG. 4 is a front view of a cutter head of a shield machine according to another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shield excavator 2 Shield main body 3 Cutter head 11 Main cutter head 11b Face plate part 12 Sub cutter head 13 Auxiliary cutter head 14, 15 Roller cutter 21, 31 Cylindrical body 22, 32 Slewing bearing 23, 33 Face plate part 26, 36 Rotation drive apparatus

────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yuji Tanaka 5-3-28 Nishikujo, Konohana-ku, Osaka-shi, Japan Inside Hitachi Zosen Corporation (56) References JP-A-62-133295 (JP, A) JP-A-2-217590 (JP, A) JP-A-8-105291 (JP, A) JP-A-6-167192 (JP, A) JP-A-3-79396 (JP, U) JP-A-6-34468 ( JP, Y2) (58) Fields investigated (Int. Cl. ⁷ , DB name) E21D 9/08-9/10

Claims (3)

(57) [Claims] An auxiliary cutter head is rotatably provided at the center of a main cutter head rotatably provided at a front portion of a shield body, and a plurality of auxiliary cutter heads are provided on a face plate of the annular main cutter head. It is rotatably provided, and at least the auxiliary cutter head is provided so as to be able to move forward and backward from the face plate portion of the main cutter head , and obstructs the ground.
If an object is present, make the auxiliary cutter head protrude forward.
The shield machine, characterized in that it has to so that. 2. The shield according to claim 1, wherein at least one of the plurality of auxiliary cutter heads is disposed at a different radial distance from the rotation axis of the main cutter head with respect to the other cutter heads. Excavator. 3. The shield machine according to claim 1, wherein a roller cutter is provided on the auxiliary cutter head.