JPH066870B2 - Tunnel excavator - Google Patents

Description

The present invention relates to a tunnel excavator.

[Conventional technology]

Conventional full-section rock excavator for rock mass (hereinafter referred to as "excavator")
Abbreviated. ) Is shown in FIGS. A roller cutter 1 is attached to the face plate 2 of the cutter head 4 so as to come into contact with the tunnel excavation surface (front surface) A and rotate individually by the rotation of the cutter head 4.
Is rotatably supported by a mount 4A, and is rotationally driven by a motor 6 as a drive source via a speed reducer 10.

The gripper 13 for pressing the tunnel wall surface is connected to the gripper block 12 via the gripper jack 8 which expands and contracts in the radial direction of the tunnel, and the gripper block 12 is fitted to the main beam 11 extending rearward from the cutter head 4. The structure is such that it can slide on the main beam 11.

Further, between the mount 4A supporting the cutter head 4 and the gripper block 12, a plurality of propulsion jacks for connecting the two are provided.

At the time of tunnel cutting, hydraulic pressure is applied to the gripper jack 8 attached to the gripper block 12 as shown in FIG. 6 to hold the gripper 13 strongly against the tunnel inner wall B, and in this state, the cutter head 4 is driven by the motor 6. While rotating, hydraulic pressure is applied to the plurality of propulsion jacks 9 via the mount 4A to press the cutter head 4 against the tunnel front surface A with a strong force. And cutter head 4
By the rotation of the roller cutter 1, the roller cutter 1 rolls and crushes the front surface A of the tunnel to puncture the tunnel.

As the excavation in front of the tunnel progresses, the propelling jack 9 extends and the mount 4A that supports the cutter head 4 pulls the main beam 11 forward and is supported by the gripper block 12 in the tunnel radial direction, while Move forward to the end of the stroke.

The crushed rock slide collapses between the face plate 2 and the cutting surface A, accumulates downward, is scraped into the cutter head 4 by the scraper 3 attached to the outer periphery of the cutter head 4, and is incorporated in the cutter head 4. The belt conveyor 7 that has been loaded into the hopper 5 and extends below the hopper 5.
Is sent to the rear and discharged.

When the propulsion jack 9 reaches the end of the stroke, or when the propelling is stopped and the gripper block 12 is moved forward depending on the situation, the leg 14 with the expandable hydraulic cylinder is lowered to the lower part of the inner wall of the tunnel to support the rear end of the main beam. To do. Thereafter, the gripper jack 8 is contracted, the gripper 13 is retracted, and the propulsion jack 9 is contracted to slide the gripper block 12 forward. By repeating these operations, the tunnel excavator is sequentially advanced to penetrate the tunnel.

[Problems to be Solved by the Invention]

As described above, the conventional excavator has a set of gripper blocks 12 behind it, and when moving, the motor 6 is stopped to suspend the excavation and be sure to support the main beam with the rear legs 14, and then the gripper jack 8 Shrink the gripper
After separating 13 from the tunnel wall B, the propulsion jack 9 is contracted and the gripper block 12 is moved forward. And
The gripper jack 8 is extended again and the gripper 13 is stretched on the tunnel wall surface B, and then excavation work is performed. Since the excavation and the forward movement are alternately performed as described above, the ratio of the excavation time in the working time is small and the efficiency is low.

The present invention solves the problem that the conventional device has, and does not interrupt the excavation work even during forward movement,
The purpose is to provide a tunnel excavator with extremely high work efficiency.

[Means for Solving the Problems]

According to the present invention, the above object is to provide a main beam extending rearward from a rear portion of a mount supporting a cutter head in a central portion of a tunnel excavating machine in a radial direction of the tunnel or its periphery, and An inner guide and an outer guide which are independently slidable on the main beam are provided on the outer side, and a front gripper for pressing the tunnel wall surface via the front gripper jack that expands and contracts in the radial direction on the outer guide. And a first propulsion jack that connects the outer guide and the mount to each other and expands and contracts in the front-rear direction, and a rear gripper support portion exposed from the main beam is provided at the rear portion of the inner guide. A rear gripper for pressing the tunnel wall surface is provided through a rear gripper jack that expands and contracts in the radial direction. This is achieved by providing a second propulsion jack which is connected between the rear gripper support portion and the mount and which expands and contracts in the front-rear direction.

[Action]

As described above, according to the present invention, first, the rear gripper pushes the tunnel wall surface to contract the first propulsion jack attached to the outer guide in advance during excavation.

Then, when excavation progresses and the second propulsion jack reaches the end of the stroke, or when it is desired to move the rear gripper position, immediately before that, the front gripper jack that was previously retracted forward is extended and the front gripper is attached to the tunnel wall surface. Stretch. Thereafter, the rear gripper jack is contracted, the gripper is separated from the tunnel wall surface, the first propulsion jack is contracted, and the rear gripper support portion is advanced. At this time, by the front gripper attached to the outer guide,
The excavator is already on hold and excavation continues without interruption.

When the first propulsion jack attached to the outer cylinder reaches the end of the stroke or when the front gripper is moved, the rear gripper is attached immediately before that and the same operation is repeated.

Thus, in the present invention, the excavator is supported by either the front grip or the rear gripper, and the propulsion jack on the other gripper side is extended to continuously excavate without interruption.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 4 of the accompanying drawings.

FIG. 1 is a longitudinal sectional view in the longitudinal direction of a tunnel of the actual case device, FIG. 2 is a longitudinal sectional view in the same direction showing an enlarged main part of the device in FIG. 1, and FIG. III-III sectional view and FIG. 4 are IV-IV sectional views in FIG.

In the figure, the same parts as those of the conventional device shown in FIGS. 5 to 7 are designated by the same reference numerals and the description thereof will be omitted.

In the figure, a rectangular main beam 15 is provided to extend rearward (to the right in FIG. 1) from a rear portion of a mount 4A that rotatably supports the cutter head 4. The main beam 15 is provided with an outer cylinder 17 as an outer guide slidably guided by the outer surface of the main beam 15. The outer cylinder 17
There are four front gripper jacks 8a, which are expandable and contractible radially outward of the tunnel, are radially provided, and the front grippers 13a are attached to their tips. A first propulsion jack 9a is provided between the mount 4A and the outer cylinder 17 to connect them.

The four front gripper jacks 8a can be shortened in length if they are set at positions in the circumferential direction so as to avoid interference with the motor 6 when moving forward.

On the other hand, an inner cylinder 16 as an inner guide is inserted and guided inside the rectangular cylindrical main beam so as to be slidable back and forth.
A second propulsion jack 9b is arranged in the inner cylinder 16, the rear portion of the main body is fixed to the inner cylinder 16, and the front end of the rod is mounted on the mount 4A.
Are linked to. The inner cylinder 16 is attached at its rear end to a gripper block 12b which serves as a rear gripper support portion, and is adapted to move the gripper block 12b back and forth by the expansion and contraction operation of the second propulsion jack 9b. The gripper block 12b is provided with a pair of rear gripper jacks 8b that can expand and contract in the radial direction of the tunnel, and a rear gripper 13b is attached to the tips of the rear gripper jacks 8b.

In this embodiment as described above, the front gripper 13a
One of the rear gripper 13b and the rear gripper 13b presses the wall surface of the tunnel to support the machine, and the propulsion jack on the one gripper side pushes the cutter head forward through the mount to excavate the front surface A of the tunnel. When the propulsion jack on one gripper side is fully extended, the other gripper supports the machine, and the propulsion jack on the other gripper side pushes out the cutter head. And
Shorten the propulsion jack on the one gripper side. During that time, drilling will continue without interruption.

Thus, excavation is performed continuously by alternately propelling the cutter head by the two propulsion jacks while alternately supporting the front or rear grippers.

〔The invention's effect〕

According to the present invention, the front gripper and the rear gripper are provided as described above, and the grippers are alternately operated to support the airframe so that the excavation can be continuously performed without interruption, so that the excavation work efficiency is further improved. Bring effect. Further, the leg at the rear end of the main beam, which has been conventionally required, becomes unnecessary, and the cost of the device can be reduced.

[Brief description of drawings]

1 is a longitudinal sectional view in the longitudinal direction of the tunnel of the apparatus of this embodiment, FIG. 2 is a longitudinal sectional view in the same direction showing the main part of the apparatus of FIG. 1, and FIG. 3 is III-III in FIG. A sectional view, FIG. 4 is a sectional view taken along the line IV-IV in FIG. 1, FIG. 5 is a longitudinal sectional view in the tunnel longitudinal direction of the conventional device, and FIG. 6 is a sectional view in FIG.
VI-VI sectional view, FIG. 7 is a VII-VII sectional view in FIG. 4 ………… Cutter head 4A ………… Mount 8a ………… Front gripper jack 8b ………… Rear gripper jack 9a ………… First propulsion jack 9b ………… Second propulsion jack 12b… Rear gripper support (gripper block) 13a Front gripper 13b Rear gripper 15 Main beam 16 ... Inner guide (inner cylinder) 17 Outer guide (outer) Tube)

Claims (3)

[Claims] 1. A main beam is provided so as to extend rearward from a rear portion of a mount for supporting a cutter head, at a central portion of a tunnel excavator in a radial direction of the tunnel or in the periphery thereof, and the main beam is independently provided inside and outside the main beam. An inner guide and an outer guide which are slidable on the main beam are provided respectively, and a front gripper for pressing a tunnel wall surface is provided on the outer guide through the front gripper jack that expands and contracts in the radial direction. A first propulsion jack that connects the outer guide and the mount to each other and expands and contracts in the front-rear direction is provided, and a rear gripper support part exposed from the main beam is provided in the rear part of the inner guide and expands and contracts in the radial direction. A rear gripper for pressing the tunnel wall surface is provided through the rear gripper jack, and the rear gripper support is provided. It provided a second propulsion jacks which expands and contracts in the longitudinal direction by connecting both between the parts and mount it to the tunnel boring machine. 2. The main beam and the inner beam form a square tube, and the second propulsion jack is one.
The tunnel excavator described in (1). 3. The tunnel excavator according to claim 1, wherein the main beam and the outer beam form a rectangular tube.