JPH03191199A - Tunnel excavator - Google Patents

Abstract

PURPOSE:To improve the efficiency of excavation work by installing grippers at the front and rear sections of a tunnel excavator through gripper jacks respectively, alternately operating these grippers, supporting a machine body and conducting continuous excavation without interruption. CONSTITUTION:An external cylinder 17 is mounted on a main beam 15 set up to a mount 4A rotatably supporting a cutter head 4, front gripper jacks 8a and fitted radially to the external cylinder 17, and front grippers 13a are installed at the front ends of the external cylinder 17. A first propulsive jack 9a connecting both the mount 4A and the external cylinder 17 is mounted between the mount 4A and the external cylinder 17. An internal cylinder 16 is inserted into the main beam 15, a second propulsive jack 9b is disposed into the internal cylinder 16 and connected to a gripper block 12b, a rear gripper jack 8b is set up to the gripper block 12b, and a rear gripper 13b is fitted at the front end of the rear gripper jack 8b. These grippers are operated alternately and a machine body is supported, and continuous excavation is performed.

Description

[Detailed description of the invention] [Industrial application field] TECHNICAL FIELD The present invention relates to a tunnel boring machine.

[Conventional technology] Conventional full-section rock tunnel excavator (hereinafter referred to as "excavator")
It is abbreviated as ) are shown in Figures 5 to 7. A roller cutter 1 is attached to the face plate 2 of the canter head 4, and the roller cutter 1 contacts the tunnel excavation surface (front surface) A and rotates individually as the cutter head 4 rotates.
is rotatably supported by a mount 4A, and is rotationally driven by a motor 6, which is a drive source, via a speed reducer 10.

A gripper 13 for pressing the tunnel wall surface is connected to a grinoper block 12 via a grisobar jack 8 that expands and contracts in the radial direction of the tunnel.
It has a structure that allows it to slide on the main beam 11.

A mount 1-4 supporting the cutter head 4 is provided.
A and the Glisover block 12 are provided with a plurality of propulsion jacks that connect them.

When cutting a tunnel, as shown in Fig. 6, hydraulic pressure is applied to the griso bar jack 8 attached to the grinoper bronk 12 to hold the gripper 13 by strongly pushing against the inner wall B of the tunnel, and in this state, the motor 6L is This rotates the canter head 4 and applies hydraulic pressure to the plurality of propulsion jacks 9 via the mount 48 to press the force 7ter throat 4 against the tunnel front surface A with strong force. As the cutter head 4 rotates, the roller cutter 1 rolls and crushes the front surface A of the tunnel, thereby boring a tunnel.

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

The crushed rock falls between the face plate 2 and the cutting surface A, accumulates below, is scraped into the canter head 4 by the scraper 3 attached to the outer periphery of the cutter head 4, and is scraped into the canter head 4. The liquid is fed into the hopper 5 which has been opened, and is sent rearward by the belt converter 7 extending below the hopper 5 and discharged.

When the propulsion jack 9 reaches the end of its stroke or, depending on the situation, stops propulsion and moves the gripper block 12 forward, the leg 14 with a built-in extendable hydraulic cylinder is lowered to the bottom of the tunnel inner wall, and the rear end of the main beam is lowered. To support. Thereafter, the gripper jack 8 is retracted to retract the gripper 13, and the propulsion jack 9 is retracted to slide the gripper block 12 forward. By repeating these operations, the tunnel boring machine is sequentially advanced to penetrate the tunnel.

(Problems to be Solved by the Invention) The conventional excavator as described above has a set of gnosoperburonok 12 at the rear thereof, and when moving, the motor 6 is stopped, excavation is temporarily interrupted, and the excavator at the rear is always stopped. After supporting the main beam with the legs 14, the gripper jack 8 is retracted to move the gripper 13 away from the tunnel wall B, and the propulsion jack 9 is retracted to move the gripper rod 12 forward.

Then, extend the gripper jack 8 again.
13 is applied to the tunnel wall surface B, and then the excavation work is performed. Since this is intermittent work in which excavation and advancement are performed alternately, the ratio of excavation time to the work time is small, resulting in poor efficiency.

SUMMARY OF THE INVENTION An object of the present invention is to solve the problems faced by such conventional devices and to provide a highly efficient tunnel boring machine that does not interrupt excavation work even during forward movement.

[Means to solve the problem]

According to the present invention, the above object is to provide a main beam extending rearward from a rear part of a mount that supports a cutter head at or around the radial center of a tunnel of a tunnel excavating machine, and to An inner guide and an outer guide that are independently slidable on the main beam are provided on the outer side, and the outer guide is provided with a front gripper that expands and contracts in the radial direction.
Front gripper for pressing against tunnel wall via jack
A first propulsion jack is provided between the outer guide and the mount and expands and contracts in the front-rear direction by connecting the two, and a rear gripper support portion exposed from the main beam is provided at the rear of the inner guide. A rear gripper jack for pressing the tunnel wall is provided via the rear gripper jack that expands and contracts in the radial direction, and a second propulsion jack that expands and contracts in the front and back direction is provided between the rear gripper support and the mount and connects both. This is achieved by establishing.

(Function) In the present invention as described above, first, the first propulsion jack attached to the outer guide is contracted in advance while the rear gripper pushes the tunnel wall surface and excavates.

When the excavation progresses and the second propulsion jack reaches the end of its stroke, or when it is desired to move the rear gripper position, the front gripper jack, which has been pulled forward in advance, is extended and the front gripper is moved forward into the tunnel. Hang it against the wall. Thereafter, the rear gripper jack is retracted to move the gripper away from the tunnel wall, and the first propulsion jack is retracted to advance the rear gripper support. At this time, the excavator is already held in place by the front gripper attached to the outer guide, and excavation continues without interruption.

When the first propulsion jack attached to the outer cylinder reaches the end of its stroke or when moving the front gripper, tighten the rear gripper just before that and repeat the same operation.

Thus, in the present invention, the front or rear gripper
The excavator is supported on one of the grippers and the gripper on the other
Extending the side propulsion jacks allows uninterrupted (continuous) excavation.

(Example) Hereinafter, the present invention will be described in detail based on FIGS. 1 to 4 of the accompanying drawings.

Fig. 1 is a joint sectional view in the longitudinal direction of the tunnel of the device of this embodiment, Fig. 2 is a longitudinal sectional view in the same direction showing an enlarged view of the main parts of the device in Fig. 1, and Fig. III-I
II sectional view and FIG. 4 are TV-IV sectional views in FIG.

In the drawings, the same parts as those of the conventional apparatus shown in Figs. 5 to 7 are given the same reference numerals, and the explanation thereof will be omitted.

In the figure, a rectangular cylindrical main beam 15 is provided extending rearward (to the right in FIG. 1) from the rear 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 that is slidably guided on the outer surface of the main beam 15. The outer cylinder 17 is provided with four front grippers 8a radially extending outward in the radial direction of the tunnel, and a front gripper 13a is attached to the tips of these grippers 8a. A first propulsion jack 9a is provided between the mount 4A and the outer cylinder 17 to connect the two.

In addition, the above four front grilles, 7 purge gears, and 8a are as follows:
If the circumferential position is set so as to avoid interference with the motor 6 during forward movement, the length of the machine can be shortened.

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 jar, key 9b, is disposed within the inner cylinder 16,
The rear part of the main body is fixed to the inner cylinder 16, and the front end of the rod is connected to the mount 1-4A. The inner cylinder 16 has a rear end of the gripper bronk 1 which serves as a rear gripper support part.
2b, and the gripper block 12b is moved back and forth by the expansion and contraction movement of the second propulsion jack 9b. And Grisoper Blosok 12
b, a rear gripper that is telescopic in the radial direction of the tunnel;
A pair of jacks 8b are provided, and a rear gripper 13b is attached to their tips.

In this embodiment as described above, the anterior glisobar 13
The machine is supported by pressing the tunnel wall surface by one of the gripper a and the rear gripper 13b, and the cutter head is ejected forward via the mount by the propulsion jack on the one gripper side, and the tunnel front surface A is excavated. . When the propulsion jack on one gripper side is fully extended, the machine is supported by the other gripper, and the cutter head is pushed out by the propulsion jack on the other gripper side. Then, the propulsion jack on the one gripper side is shortened. During this time, drilling will continue without interruption.

In this way, excavation is carried out continuously by alternately supporting the canterhead with the front or rear grippers and alternately propelling the canterhead with the two propulsion jacks.

[Effects of the Invention] As described above, the present invention provides a front gripper and a rear gripper, which are operated alternately to support the machine body and enable continuous excavation without interruption. This has the effect of further improving work efficiency.Also,
The legs at the rear end of the main beam, which were conventionally required, are no longer necessary, and the cost I of the device can also be reduced.

[Brief explanation of drawings]

Fig. 1 is an electrical cross-sectional view in the longitudinal direction of the tunnel of the device of this embodiment, Fig. 2 is a joint cross-sectional view in the same direction showing the main parts of the device shown in Fig. 1, and Fig. 3 is m - m in Fig. 1. Section V, FIG. 4 is a cross-sectional view taken along IV-rV in FIG. The figure is a sectional view taken along the line ■-■ 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 part (Grinopabrosoku)

Claims (3)

[Claims] (1) A main beam is provided extending rearward from the rear of the mount that supports the cutter head in or around the radial center of the tunnel of the tunnel excavator, and the main beam is provided independently on the inside and outside of the main beam. An inner guide and an outer guide that are slidable on the beam are respectively provided, and the outer guide is provided with a front gripper for pressing the tunnel wall via the front gripper jack that expands and contracts in the radial direction, and the outer guide A first propulsion jack that connects the two and expands and contracts in the front and back direction is provided between the and the mount, and a rear gripper support section that is exposed from the main beam is provided at the rear of the inner guide, and the rear gripper that expands and contracts in the radial direction is provided at the rear of the inner guide. A tunnel excavator, comprising: a rear gripper for pressing a tunnel wall surface via a jack; and a second propulsion jack that connects the rear gripper support section and the mount and expands and contracts in the front and back direction. (2) The tunnel excavator according to claim (1), wherein the main beam and the inner beam are square tubes, and the second propulsion jack is one. (3) The tunnel excavator according to claim (1) or claim (2), wherein the main beam and the outer beam have a rectangular tube shape.