JPH066871B2 - 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. ) Are shown in FIGS. 6 to 8. A roller cutter 1 is attached to the face plate 2 of the cutter head 4 so as to contact the tunnel excavator (front face) A and rotate individually by the rotation of the cutter head 4. The cutter head 4 is rotatably supported by a mount 4A. Then, it is rotationally driven by the motor 6 as a drive source through the speed reducer 10.

The tunnel wall pressing gripper 13 is connected to a gripper block 12 via a gripper jack 8 which expands and contracts in the tunnel radial direction, and the gripper block 12 is fitted to a 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. 7 to hold the gripper 13 by pressing the inner wall B of the tunnel strongly, 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. The rotation of the cutter head 4 causes the roller cutter 1 to move to the front side A of the tunnel.
Punch a tunnel by crushing while rolling.

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 propelling jack 9 stops propelling toward the end of the stroke or moves the gripper block 12 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 moved forward,
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 is retracted to move the gripper 13 away from the tunnel wall B, and then the propulsion jack 9 is retracted to move the gripper block 12 forward. Then, 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 to the operation 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 excavator in a radial direction of the tunnel excavator or a peripheral portion thereof, and sliding on the main beam. A front guide and a rear guide that are movable are provided respectively, and the front guide and the rear guide are respectively retractable front and rear in the radial direction for pressing the tunnel wall surface via front and rear gripper jacks, respectively. A rear gripper is provided, and the mount and the front guide, and the front guide and the rear guide are connected by a front propulsion jack and a rear propulsion jack that expand and contract in the front-rear direction, respectively. Sometimes the front propulsion jack extends, and when the rear gripper presses the wall, the rear propulsion jack extends and alternately propels the mount. Has occupied manner is accomplished by.

[Action]

Hereinafter, the operation of the present invention having the above-described structure will be described step by step.

First, the front propulsion jack is extended and mounted, that is, the cutter head is advanced while the front and rear grippers are pressed against the tunnel wall surface to excavate.

When the front advancing jack is fully extended, the front gripper is released, and only the rear gripper extends the rear propulsion jack under the condition that the rear gripper is pressed against the tunnel wall surface to continue the advance of the cutter head. At the same time, it shortens the front propulsion jack. At this time, the extension amount of the rear propulsion jack is set to be larger than the shortening amount of the front propulsion jack, and the cutter head advances by the difference.

Next, while the front gripper is in the state of pressing the tunnel wall surface, the front propulsion jack is extended to advance the cutter head, while the rear wall of the rear gripper is released from the state of pressing the tunnel wall surface, and the rear propulsion jack is shortened. Move it to the forward position.

After that, by returning to the above state and repeating the above cycle, the cutter head is constantly advanced and excavation is performed without interruption.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 5 of the accompanying drawings.

FIG. 1 is a longitudinal sectional view in the longitudinal direction of the tunnel of the device of this embodiment, FIG. 2 is an enlarged longitudinal sectional view in the same direction showing the main part of the device of FIG. 1, and FIG. III-III sectional view, FIG. 4 is a IV-IV sectional view in FIG. 1, and FIG.
It is a figure which shows the process of excavation by a figure device in order.

In the figure, the same parts as those of the conventional device shown in FIGS. 6 to 8 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 a cylindrical front guide 16a and a rear guide 16b which are slidably guided on the outer surface of the main beam 15. The front guide 16a and the rear guide 16b have four front gripper jacks 8a that can expand and contract radially outward of the tunnel.
And a pair of rear gripper jacks 8b are respectively provided, and a front gripper 13a and a rear gripper 13b are attached to their tips. A front propulsion jack 9a is provided between the mount 4A and the front guide 16a to connect them.
However, a rear propulsion jack 9b is provided between the front guide 16a and the rear guide 16b to connect them. The propulsion length (extension length) of the front propulsion jack 9a and the rear propulsion jack 9b is set so that the latter is larger.

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.

Next, the operation of tunnel excavation by the apparatus of this embodiment as described above will be described in the order of steps with reference to FIG.

First, as shown in step (A) of FIG. 5, with the rear propulsion jack 9b in a shortened state, the front gripper 13a and the rear gripper 13b are pressed against the tunnel wall surface,
The front propulsion jack 9a is extended to advance the mount 4A (see FIG. 5, step (B)), and excavation is performed by the cutter head.

Next, as shown in step (C) of FIG. 5, the rear propulsion jack 9b is extended and the front propulsion jack 9b is extended in a state in which the front wall gripper 13a is released from the tunnel wall surface pressure and is pressed only by the rear gripper 13b. Shorten 9a. At this time,
The amount of extension of the rear propulsion jack 9b is larger than that of the front propulsion jack.
Since it is larger than the shortening amount of 9a, the front propulsion jack 13a and the cutter head are eventually advanced by the difference.

After that, the forward front gripper 13a is pressed against the tunnel wall to extend and mount the front propulsion jack 9a.
Advance 4A. At the same time, the rear gripper 13b is released, the rear propulsion jack 9b is shortened, and the rear gripper 13b is pulled out forward (see step (D) and step (E)).

While repeating the above steps (1) to (5), the mount is always advanced by one of the propulsion jacks, and the excavation is continued without interruption.

〔The invention's effect〕

According to the present invention, as described above, a front guide and a rear guide each having a front grip and a rear gripper are provided on one main beam so as to be slidable back and forth, and a mount for rotatably supporting a cutter head and the front guide. A front propulsion jack is installed between the front and rear guides, and a rear propulsion jack is connected between the front guide and the rear guide. Since it is decided to move forward, it is possible to continue excavation without interruption, and there is an effect that the excavation work efficiency is further improved. Also,
The legs at the rear end of the main beam, which were required in the past, are no longer required, 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. Sectional views, FIG. 4 is a sectional view taken along line IV-IV in FIG. 1, FIG. 5 is a view showing an excavation operation of the apparatus in FIG. 1 in order of steps, and FIG. 6 is a longitudinal sectional view in the longitudinal direction of the tunnel of the conventional apparatus, Figure 7 is VII in Figure 5
-VII sectional view, and FIG. 8 is a VIII-VIII sectional view in FIG. 4 ………… Cutter head 4A ………… Mount 8a ………… Front gripper jack 8b ………… Rear gripper jack 9a ………… Front propulsion jack 9b ………… Rear propulsion jack 13a …… Front gripper 13b Rear gripper 15 Main beam 16a Front guide 16b Rear guide

Claims (1)

[Claims] 1. A main beam extending rearward from a rear portion of a mount for supporting a cutter head at or around a central portion of a tunnel excavator in a radial direction of a tunnel, and the main beam is slidable on the main beam. The front guide and the rear guide are provided respectively, and the front guide and the rear guide are provided with front and rear grippers that can be retracted in the radial direction for pressing the tunnel wall surface via the front and rear gripper jacks, respectively. The mount and the front guide, and the front and rear guides are connected by a front propulsion jack and a rear propulsion jack that expand and contract in the front-rear direction, respectively, and the front propulsion jack is pressed when the front gripper presses the tunnel wall surface. However, when the rear gripper is pressed against the wall, the rear propulsion jack extends to alternately propel the mount. It is a tunnel excavator.