JPH08291690A - Tunnel excavator - Google Patents

Abstract

PURPOSE: To reduce labor and cost of a drilling work for a lock bolt hole. CONSTITUTION: A lock bolt hole drilling device 21 is provided, through a bracket 20, under a shielding plate 19 at the rear of a tunnel excavator 1 which has a cutter head 7 before a main body of the excavator. By turning and swinging the device 21, a lock bolt hole is drilled at any position of wall of a reaming pit 3.

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 which excavates by a cutter head provided in a front portion of an excavator body.

[0002]

2. Description of the Related Art Generally, a rock bolt is driven in a tunnel wall for reinforcement in tunnel excavation work in which a cutter head is provided at a front portion of an excavator body. In order to drive the lock bolt, a hole for the lock bolt is previously drilled in the tunnel pit wall, and a self-propelled drilling machine is usually used for this drilling.

[0003]

However, this self-propelled drilling machine is a huge heavy machine as shown in FIG. 3, and the work of carrying this self-propelled drilling machine into the tunnel mine and carrying it out after use is carried out. Is very laborious. There is also a problem that this self-propelled punch is very expensive. Also, this self-propelled drilling machine is a heavy machine, but in order to receive a large reaction force from the tunnel pit wall side when drilling a lock bolt hole, it is necessary to stretch an outrigger at each rock bolt driving position. There is also a problem that it takes time to pierce.

The present invention has been made to solve the above problems, and it is an object of the present invention to provide a tunnel excavator which can save labor and cost for drilling a rock bolt hole. It is intended.

[0005]

[Means for Solving the Problems and Actions / Effects] In order to achieve the above object, the tunnel excavator according to the present invention is
In a tunnel excavator for excavating by a cutter head provided at a front portion of an excavator body, a boring device for boring a lock bolt hole is provided in the excavator body.

According to the tunnel excavator of the present invention, the lock bolt hole can be bored without using the self-propelled drilling machine, so that the cost can be reduced and the self-propelled drilling machine can be tunneled. There is no need to carry in and out the mine. Furthermore, even if a large reaction force is applied from the tunnel shaft side to the drilling device for the lock bolt holes provided in the main body of the tunnel excavator, the tunnel excavator itself is strongly supported against the tunnel shaft. Unlike the conventional case, the step of tensioning the outrigger separately is not required, and the work of forming the lock bolt hole can be efficiently advanced. In addition, since the excavator body equipped with a cutter head on the front side is provided with a hole drilling device for rock bolts, it is possible to reinforce the tunnel by placing rock bolts immediately after excavation by the cutter head. Can increase the safety of.

In the tunnel excavator of the present invention, it is preferable that the boring device is rotatable about an axis along the tunnel excavating direction. By doing this,
A rock bolt hole can be drilled at an arbitrary position along the circumference of the tunnel pit wall cross section at a predetermined position of the tunnel.

Further, it is preferable that the punching device is swingable back and forth with respect to the excavating direction of the tunnel.
By doing so, the rock bolt hole can be provided perpendicularly to the tunnel pit wall, and the rock bolt hole can be provided obliquely to the tunnel pit wall.

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 product and scope of the invention will be apparent to those skilled in the art from the detailed description, and It will be described as an example.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A concrete embodiment of the tunnel excavator according to the present invention will be described with reference to the drawings.

FIG. 1 is a side sectional view of a tunnel excavator 1 for an inclined shaft according to an embodiment of the present invention. The tunnel excavator 1 according to the present embodiment is used, for example, for excavating an inclined shaft for water conveyance in a power plant, and after excavating an inclined pilot shaft 2 in advance with the pilot shaft tunnel excavator, It is an inclined shaft reaming excavator that expands the rock mass on the outer peripheral side of the pilot mine 2 into a reaming mine 3.

In this tunnel excavating machine 1, a main beam 4 having a rear section of a rectangular cross section 4a and a front section of a cylindrical cross section 4b across the pilot shaft 2 and the reaming shaft 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. Further, the cutter head support 6 has a roof support 9, a side support (not shown), for supporting the main frame 5 on the inner peripheral surface of the reaming pit 3 at the end of excavation.
A vertical support 10 is provided. Roof support 9, side support, vertical support 1
0 is supported by the cutter head support 6 via a link and is also supported by the inner peripheral surface of the reaming pit 3 by driving a gripper jack composed of a hydraulic cylinder.

A nose gripper 11 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 12 that supports the inner peripheral surface of the pit 3 is provided.
The nose gripper 11 has a support body 13 attached to the main beam 4 and a circumference of the support body 13 of about 3 mm.
Three gripper jacks 14 provided at equal positions
(Only one is shown) and gripper shoes 15 (only two are shown) attached to the tip of each gripper jack 14.
It is said to be equipped with. In addition, the main gripper 12 includes a carrier 16 supported by the main beam 4.
And a gripper jack 17 supported on the upper and lower parts of the carrier 16, and a gripper shoe (not shown) pin-supported on the rod tip end (extending in the front-back direction of the paper) of these gripper jacks 17. It is said that.

At the rear part of the main body of the tunnel excavator 1 of this embodiment, there is provided a spraying device 18 for spraying a spraying agent for preventing collapse onto the wall of the reaming pit 3, and the main body part is sprayed immediately before this spraying device 18. A shield plate 19 is provided for protecting from the agent and having a central portion formed in a convex shape on the rear side.

A bracket 20 is erected under the shield plate 19, and a lock bolt hole punching device 21 is attached to the tip of the bracket 20. The rock bolt hole punching device 21 includes a turning mechanism 22 attached to the tip of the bracket 20 and a swinging mechanism 2 attached to the turning mechanism 22.
3 and a punching device main body 24 supported through

The swivel mechanism 22 includes the punching device 2
As shown by phantom lines in FIG. 2, 4 is rotated about an axis along the tunnel excavation direction (axis perpendicular to the plane of FIG. 2). By such turning, the punching device body 24 can be positioned at an arbitrary position in the circumferential direction of the reaming pit 3.

The rocking mechanism 22 rocks the boring machine body 22 back and forth with respect to the tunnel excavation direction by means of a hydraulic cylinder, as shown in phantom in FIG. By such swinging, it is possible to position the punching device main body 24 at a position at an arbitrary oblique angle with respect to the pit wall of the reaming pit 3.

The punching device body 24 is provided with a hole for a lock bolt by rotating a drill rod 26 having a drill bit 25 at its tip into the pit wall of the reaming pit 3.

In the tunnel excavator 1 of this embodiment, the main body is strongly supported by the gripper jack 17 on the wall of the reaming pit 3 via the gripper shoe 27 as shown in FIGS. Therefore, even if the rock bolt hole drilling device 21 receives a large reaction force from the wall of the reaming pit 3 during drilling, the rock bolt hole drilling device 21
Is not pushed. Therefore, the rock bolt hole punching device 21 does not need to separately provide a supporting means such as the outrigger of the conventional example.

In the tunnel excavator 1 of this embodiment, since the rock bolt hole drilling device 21 is provided at a position relatively close to the cutter head 7, the reaming pit is formed by the rock bolt early after digging the reaming pit 3. The mine wall of 3 can be reinforced. Further, since the lock bolt hole drilling device 21 is provided immediately after the spraying device 18, after the collapse prevention processing of the reaming mine 3 by the spraying agent,
The wall of the reaming pit 3 can be immediately reinforced.

As described above, according to the tunnel excavator 1 of the present embodiment, the rock bolt hole drilling device 21 is compactly integrated, so that the excavation of the reaming pit 3 and the reinforcement of the pit wall of the reaming pit 3 are performed. Can be done efficiently.

The tunnel excavator 1 of the present embodiment equipped with the rock bolt hole punching device 21 is for an inclined shaft.
It goes without saying that it may be for a horizontal shaft.
Further, the rock bolt hole drilling device 21 is not limited to the lower part of the shield plate 19, but the cutter head 7 of the tunnel excavator 1.
It can be attached to any position on the rear side of the.

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 a side sectional view of a tunnel excavator of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a side view of a conventional self-propelled punching machine.

[Explanation of symbols]

 1 Tunnel excavator 2 Pilot pit 3 Reaming pit 4 Main beam 5 Main frame 6 Cutter head support 7 Cutter head 8 Roller cutter 9 Roof support 10 Vertical support 11 Nose gripper 12 Main gripper 13 Support 14 Gripper jack 15 Gripper shoe 16 Carrier 17 Gripper jack 18 Spraying device 19 Shielding plate 20 Bracket 21 Rock bolt hole punching device 22 Swiveling device 23 Swinging device 24 Drilling device body 25 Drill bit 26 Drill rod 27 Gripper shoe

Claims (3)

[Claims] 1. A tunnel excavator for excavating with a cutter head provided at a front portion of an excavator body, wherein the excavator body is provided with a boring device for boring a lock bolt hole. 2. The tunnel excavator according to claim 1, wherein the boring device is rotatable about an axis along a tunnel excavating direction. 3. The drilling device is swingable back and forth with respect to the tunnel excavation direction.
Or the tunnel excavator according to 2.