JP3530618B2 - Tunnel excavator - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tunnel excavator, and more particularly to a tunnel excavator for expanding a previously excavated pilot pit to a reaming pit.

[0002]

2. Description of the Related Art Conventionally, when excavating a large-diameter tunnel, a method of excavating a pilot pit with a tunnel digging machine for pilot pits in advance and then expanding the pilot pit with a tunnel digging machine for reaming pits Is taken.

In this type of reaming tunnel excavator, it is desirable to install an inspection deck at the front end for inspection or reinforcement repair of the inner wall of the existing pilot pit. An example of an inspection deck provided for this purpose is disclosed in Japanese Patent Laid-Open No. 125892/1993. In the tunnel excavator described in this publication,
In the shield type excavator, an inspection step (inspection deck) is attached to the center of the excavator body toward the front.

[0004]

However, the inspection deck as described in the above publication is applicable to a tunnel excavator having a shield in the periphery and a large cavity in the center, and In the type of tunnel excavator that has a main beam that extends back and forth in the section,
Since the main beam becomes an obstacle, the inspection deck as described above cannot be installed.

The present invention has been made in view of these problems, and it is an object of the present invention to make it easy to inspect and maintain the front portion of a reaming tunnel excavator of the type having a main beam. It is intended.

[0006]

In order to achieve the above-mentioned object, a tunnel excavator according to the present invention is a tunnel excavator for expanding a pilot pit into a reaming pit, in which a pit is formed along a pit wall. A main beam to be extended and a gripper device for supporting the main beam with respect to the pit wall via a carrier are provided, and passages are provided in the main beam and the carrier. .

In the present invention, since the passage is provided in the main beam and the carrier, the worker can move to the front end portion of the excavator through the passage. Therefore, it is possible to easily perform inspection / maintenance of the pilot pit wall, inspection / maintenance of the front part of the fuselage, and confirmation of the excavated soil discharge status.

The inspection deck may be provided at the front end of the main beam, or at the front end of the main beam, a tip side gripper device for supporting the main beam with respect to the pit wall may be provided. It may be provided on the front end side of the device.

Objects of the present invention will become apparent from the detailed description given below. However, while the detailed description and specific examples describe the most preferred embodiments, various modifications and variations within the spirit and scope of the invention will be apparent to those skilled in the art from the detailed description, and therefore, specific examples As described below.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, specific embodiments of the tunnel excavator according to the present invention will be described with reference to the drawings.

FIG. 1 is an overall perspective view of a tunnel excavator according to an embodiment of the present invention, and FIG. 2 is a side view of the tunnel excavator. Tunnel excavator 1 of this embodiment
Is used, for example, for excavating an inclined pit for water conveyance of a power plant, and after excavating an inclined pilot pit 2 with a pilot pit tunnel excavator in advance, It is an inclined shaft reaming excavator that expands and excavates the ground to the reaming pit 3.

In this tunnel excavating machine 1, the main beam 4 is constructed such that the rear portion is a square tube section 4a and the front portion is a cylindrical section 4b across the pilot pit 2 and the reaming pit 3.
The main beam 5 is supported by the main beam 4 so as to be slidable back and forth. This mainframe 5
To the cutter head 7 via the cutter head support 6.
Is rotatably supported, and a large number of roller cutters 8 are attached to the front end of the cutter head 7. In addition, the cutter head support 6 is provided with a hold gripper including a roof support 9, a side support 10 and a vertical support 11 for supporting the main frame 5 on the inner peripheral surface of the reaming pit 3 at the end of excavation. . These roof support 9, side support 1
0 and the vertical support 11 are supported by the cutter head support 6 via a link and are also supported on the inner peripheral surface of the reaming pit 3 by driving a gripper jack composed of a hydraulic cylinder.

A nose gripper 12 for supporting the main beam 4 with respect to the inner peripheral surface of the pilot shaft 2 is provided at the front of the main beam 4, and the main beam 4 is reamed at the rear of the main beam 4. A main gripper (rear gripper) 13 that supports the inner peripheral surface of the pit 3 is provided. The nose gripper 12 includes a support 14 attached to the main beam 4 and the support 14
On the other hand, it is provided with three gripper jacks 15 (see FIG. 5) provided at positions that divide the circumference into approximately three equal parts, and a gripper shoe 16 attached to the tip of each gripper jack 15. In addition, the main gripper 1
3 includes a carrier 17 supported by the main beam 4, gripper jacks 18 supported on the upper and lower portions of the carrier 17, and a gripper shoe 19 pin-supported on the rod tip end of these gripper jacks 18. It is said that.

Further, in order to generate a propulsive force of the cutter head 7 during excavation, four thrust jacks 20 are provided between the main gripper 13 and the main frame 5, two on each of the left and right sides. There is. Furthermore, in order to support the load of the carrier 17 etc. when the gripper is relocated,
Left and right between the main frame 5 and the carrier 17
A total of two hydraulic holding jacks 21 are provided for each. Note that in FIG. 1, reference numeral 22 denotes a succeeding carriage integrally connected to the carrier 17.

As shown in FIG. 3, a passage 23 having a circular cross section is provided at the center of the carrier 17 so as to penetrate the carrier 17 in the front-rear direction. Also, FIG.
As shown in FIG.
In a, a passage 24 communicating with the passage 23 of the carrier 17 is provided along the longitudinal direction, a number of steps 25 are attached to the lower portion of the passage 24, and handrails are provided on both sides of the passage 24. 26 is attached.
The mounting angle of step 25 is set to be horizontal when the tunnel excavator 1 is arranged to excavate a predetermined inclined shaft.

Further, a passage 27 (see FIG. 5) communicating with the passage 24 also extends to the front end of the cylindrical cross section 4b in the cylindrical cross section 4b provided at the front end of the rectangular cross section 4a. It is provided. This passage 27 is branched into a bifurcated branch passage 28 at the position of the support body 14 in order to avoid interference with the three gripper jacks 15, and this branch passage 28 is a cylindrical cross-section portion 4 b on the tip side of the support body 14.
In, the flow path 27 is joined again into one passage 27, and the passage 27 extends to the front end surface of the cylindrical cross section 4b inclined with respect to the axis of the cylindrical cross section 4b.

As shown in FIGS. 6 and 7, a deck 30 having a handrail 29 is attached to the front end surface of the cylindrical cross section 4b so as to project forward.
A door 31 is provided between the door and the passage 27.
The mounting angle of this deck 30 is the same as in step 2 above.
Similar to 5, the tunnel excavator 1 is made horizontal when it is arranged to excavate a predetermined inclined shaft.

With such a configuration, the operator can view the passage 23 in the carrier 17 and the passages 24, 27, 2 in the main beam 4 from the rear side of the carrier 17.
It is possible to easily move to the deck 30 at the front end portion of the main beam 4 through 8, 27. Therefore, the inner wall of the pilot pit 2 can be inspected and maintained before the diameter expansion of the reaming pit 3 and the wall surface of the pilot pit 2 can be reinforced if necessary.
In addition to such inspection and maintenance of the pilot pit 2, these passages 24, 27, 28 can also be used for inspection and maintenance of the front part of the machine body or confirmation of the excavated soil excavation condition.

In the present embodiment, the description has been made of the case where the main beam 4 is applied to the two-point support type tilting shaft reaming excavator which is supported by the nose gripper 12 and the main gripper 13, but the present invention has a nose gripper. It can also be applied to tunnel excavators of the type that do not. As described above, in the type having no nose gripper, the deck 30 is directly attached to the front end portion of the main beam 4 without the support 14. Further, the present invention can be applied not only to an inclined shaft reaming excavator but also to a tunnel excavator excavating a horizontal shaft.

As mentioned above, it is obvious that the present invention can be variously modified. Such modifications are within the spirit and scope of the invention, and all such variations and modifications apparent to those skilled in the art are intended to be within the scope of the following claims.

[Brief description of drawings]

FIG. 1 is an overall perspective view of a tunnel excavator according to an embodiment of the present invention.

FIG. 2 is a side view of the tunnel excavator of this embodiment.

3 is a cross-sectional view taken along the line AA of FIG.

FIG. 4 is a vertical cross-sectional view (a) of the rectangular tube cross-section portion of the main beam and a BB cross-sectional view (b) of (a).

5 is a cross-sectional view taken along line CC of FIG.

6 is a partially enlarged view of FIG.

FIG. 7 is a view on arrow D of FIG.

[Explanation of symbols]

1 tunnel excavator 2 pilot pits 3 reaming mines 4 main beam 4a Square tube cross section 4b Cylindrical section 12 Nose gripper (tip gripper device) 13 Main gripper (gripper device) 17 career 23, 24, 27, 28 passages 30 decks

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yujiro Shibukawa 2-2-2 Matsuzaki-cho, Abeno-ku, Osaka City Okumura-gumi Co., Ltd. (72) Tsutomu Mizobata 2-2-2 Matsuzaki-cho, Abeno-ku, Osaka Stocks Company Okumura Gumi (72) Inventor Shinichi Terada 3-1-1 Ueno, Hirakata-shi, Osaka Komatsu Ltd. Osaka Factory (72) Inventor Minami Yoshino 3-1-1 Ueno, Hirakata-shi, Osaka Komatsu Ltd. Osaka Plant (72) Inventor Toshihiro Yamazaki 3-1-1 Ueno, Hirakata-shi, Osaka Komatsu Ltd. Osaka factory (56) Reference JP-A-5-321579 (JP, A) JP-A-2-274996 (JP, A) Actual Kaihei 7-10098 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) E21D 9/10 E21D 9/00 E21D 9/02 E21D 9/06

Claims (3)

(57) [Claims] 1. A tunnel excavator for expanding a pilot pit into a reaming pit, a main beam extending along a pit wall, and a gripper for supporting the main beam with respect to the pit wall via a carrier. A tunnel excavator, characterized in that a device is provided, and passages are provided in the main beam and the carrier. 2. The tunnel excavator according to claim 1, wherein an inspection deck is provided at a front end portion of the main beam. 3. A front end portion of the main beam is provided with a tip side gripper device for supporting the main beam with respect to the pit wall, and an inspection deck is provided at the front end side of the tip side gripper device. The tunnel excavator according to Item 1.