JP2000104489A - Tunnel boring machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To excavate the hard rock ground even if a tunnel boring machine has a projecting member in the peripheral surface thereof by arranging a cutter head in a front surface of a skin plate, and arranging the projecting member in the peripheral surface, and projecting an auxiliary bit from the skin plate in front of the projecting member. SOLUTION: A front surface of a cutter head 3 and each roller cutter 4, 5 provided in the peripheral part crush the rock ground for excavation. At this stage, an auxiliary bit 25 is moved forward from an opening 24 of a skin plate 6 with the forward movement of the skin plate 6, and excavation spaces 28 are continuously formed outside of the inner wall 19 of a tunnel to be excavated in the axial direction of the plate 6. With the forward movement of the skin plates 6, 8, a back filling device 21 is moved forward inside of the excavation space 28 so as to smoothly excavate the hard rock ground. An axis O1 of the auxiliary bit 25 is inclined forward at the predetermined angle against the axis O of the skin plate 6, and a wide inside space is secured. With this structure, bending load to be applied to a rotary driving device 27 is lowered, and consolidation of the sediment is lowered, and the abrasion of the auxiliary bit 25 is restricted so as to prolong the lifetime of the rotary driving device 27.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tunnel excavator for excavating hard rock.

[0002]

2. Description of the Related Art Conventionally, various tunnel excavators for excavating hard rock have been proposed.

FIG. 2 is a cut-away plan view showing an example of a tunnel excavator called a shield type for rock excavation, and a disk-shaped rotary member driven by a drive motor 2 is provided in front of a drive portion 1. A cutter head 3 is provided, a large number of front roller cutters 4 made of a hard metal are provided on the front surface of the cutter head 3, and an outer peripheral portion having a similar configuration is provided on an outer peripheral portion of the cutter head 3. A roller cutter 5 is provided.

At the rear of the outer periphery of the cutter head 3, a front cylindrical skin plate 6 fixed to the driving unit 1 so as to surround the outer periphery of the driving unit 1, and fitted to the rear of the skin plate 6. Cylindrical skin plate 7 in the middle part
And a rear cylindrical skin plate 8 fitted to the rear of the skin plate 7. The skin plates 6 and 7 are connected by a digging jack 9. , 8 are connected by a bending jack 10 for controlling the direction. still,
In FIG. 2, reference numeral 11 denotes a discharging device such as a belt conveyor or a screw conveyor.

Further, front gripper shoes 13A and 13B are provided outside the driving section 1 (left and right sides in FIG. 2) so that the front jack 12 protrudes outside the skin plate 6 through an opening formed in the skin plate 6. Is provided.

[0006] A fixing block 14 is provided inside the skin plate 8.
Are provided with rear gripper shoes 16A and 16B which can be projected outside the skin plate 8 by the rear jack 15 through an opening formed in the skin plate 8.

Further, a shield jack 18 adapted to take a reaction force on a cylindrically assembled segment 17 at the inner periphery of the rear skin plate 8 is attached to the inner surface of the skin plate 8.

[0008] In the configuration of FIG.
Although the case of the structure provided with 7, 8 is shown, only the front skin plate 6 and the rear skin plate 8 are provided,
In some cases, bending is performed between the front skin plate 6 and the rear skin plate 8.

The tunnel excavator shown in FIG. 2 secures the skin plate 8 and the fixing block 14 by projecting the rear gripper shoes 16A and 16B outward by the rear jack 15 and pressing against the excavated tunnel inner wall 19. And the cutter head 3 is driven to rotate by the drive motor 2 in a state where the expansion and contraction of the center-bent jack 10 is fixed,
When the excavation jack 9 is extended, the front skin plate 6 and the drive unit 1 advance while applying a reaction force to the intermediate skin plate 7, and the front roller cutter 4 and the outer peripheral roller cutter of the rotating cutter head 3 are rotated. The rocks are crushed by 5 and the excavated material is carried backward by the belt conveyor 11.

When a predetermined stroke is excavated by extension of the excavation jack 9, the front jack 12 protrudes the front gripper shoes 13A and 13B and presses the excavated tunnel inner wall 19 to thereby drive the drive unit 1 and the front skin. The plate 6 is fixed, the rear jack 15 is contracted to release the fixation of the rear gripper shoes 16A, 16B, and the excavation jack 9 is contracted, so that the skin plates 7, 8 and the fixing block 14 are moved to the drive unit 1 side. Attract and fix by the rear gripper shoes 16A and 16B again.
The segment 17 is assembled into a cylindrical shape at the inner peripheral portion of the rear skin plate 8 to form a tunnel.

In the tunnel excavator shown in FIG.
In order to assemble the segment 17 into a cylindrical shape at the inner periphery of the skin plate 8, the front roller cutter 4 of the cutter head 3
The outer diameter of the segment 17 is smaller than the inner diameter of the tunnel inner wall 19 excavated by the outer peripheral roller cutter 5, and a gap 20 is formed between the outer periphery of the segment 17 and the tunnel inner wall 19.

For this reason, as shown in the rear view of FIG. 3, a backing injection device 21 extending in the axial direction is attached to the outer surface of the skin plate 8, and a backing agent supply pipe (not shown) is attached to the backing injection device 21. ), A backing agent such as mortar is supplied, and the backing agent is filled between the outer periphery of the segment 17 and the inner wall 19 of the tunnel from the rear end of the backing injection device 21 to fill the gap 20.

[0013]

SUMMARY OF THE INVENTION
In general, it is attached to the outer surface of the skin plate 8 so as to protrude. When excavating soft ground, the backfilling device 21 can be advanced together with the skin plate 8, but when excavating hard rock. In some cases, the propulsion resistance may increase and hinder excavation.

In order to prevent this, it is conceivable to increase the outer diameter of the excavation by the cutter head 3 and the outer peripheral roller cutter 5 or to embed the back filling device 21 in the skin plate 8.

However, when the outer diameter of the excavation is increased,
Excavation of unnecessary cross-sections is economical and disadvantageous for directional control and rolling of the excavator.

If the back-filling device 21 is embedded in the skin plate 8, the thickness of the skin plate 8 must be increased, so that the outer diameter of the entire excavator increases and the weight increases. There's a problem.

The present invention has been made in view of such circumstances, and even if the outer surface of the skin plate has a projecting member such as a back-filling device, there is no problem in excavating hard rock. It is an object of the present invention to provide a tunnel excavator that does not perform the tunnel excavation.

[0018]

SUMMARY OF THE INVENTION The present invention relates to a tunnel excavator having a cutter head provided on a front surface of a cylindrical skin plate and a projecting member projecting from an outer surface of the skin plate. The present invention relates to a tunnel excavator provided with an auxiliary bit that projects from a skin plate in front of the vehicle and is rotated by a rotary driving device.

In the tunnel excavator, it is effective to project the auxiliary bit from the skin plate so that the axis of the auxiliary bit is inclined forward at a required angle with respect to the axis of the skin plate.

According to the present invention, since the auxiliary bit rotates in front of the projecting member to excavate the rock or the like, the excavation space required for the advancement of the projecting member can be secured.

Further, in the tunnel excavator, when the auxiliary bit is projected from the skin plate so that the axis of the auxiliary bit is inclined forward at a required angle with respect to the axis of the skin plate, the drive unit and the like are crowded in the radial direction. On the other hand, for a tunnel excavator with a large space restriction, it is possible to secure a wide internal space compared to projecting the auxiliary bit from the skin plate at a right angle, and the auxiliary bit can be replaced quickly and easily. However, the bending load acting on the rotary drive of the auxiliary bit during excavation of the tunnel excavator is smaller than when the auxiliary bit protrudes at a right angle from the skin plate, and the compaction of earth and sand is less, and the wear of the auxiliary bit is suppressed. This leads to a longer life of the device.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a cut-away side view showing an example of an embodiment of the present invention. In the figure, portions denoted by the same reference numerals as those in FIGS. The configuration is the same as that of the conventional one shown in FIGS. 2 and 3, but the feature of this illustrated example is that, as shown in FIG. Auxiliary bit 2 rotated by protrusion rotation drive device 27
5 is provided.

The auxiliary bit 25 is required to have a corresponding skin plate 6 in front of the installation location of the back-filling device 21 so that its axis O1 is inclined forward by a required angle θ with respect to the axis O of the skin plate 6. It is provided so as to protrude to the outside of the skin plate 6 from the opening 24 formed at the position.

The auxiliary bit 25 is made of cemented metal and is rotatably attached to the tip of a casing 26. The auxiliary bit 25 penetrates the casing 26 from a rotary drive device 27 such as a hydraulic motor or an electric motor. The inner wall 1 of the tunnel, which is rotated through the rotation shaft and excavated by the front roller cutter 4 and the outer peripheral roller cutter 5 of the cutter head 3
The outside of 9 can be locally excavated.

In the embodiment shown in FIG. 1, an auxiliary jack 25 (not shown) is attached so that the auxiliary bit 25, the casing 26, and the rotary drive device 27 can be displaced along the central axis. Skin plate 6
May be made to protrude from the opening 24.

Next, the operation of the apparatus shown in FIG. 1 will be described.

The cutter head 3 is driven to rotate, and the auxiliary bit 25 is driven to rotate by the rotation driving device 27.
When excavation is performed while crushing the rock by the front roller cutter 4 and the outer peripheral roller cutter 5 of the rotating cutter head 3, the front surface of the cutter head 3 is excavated, and the skin plates 6, 8 are advanced in a worm-like manner. Can be done.

When the skin plate 6 advances, the auxiliary bit 25 protruding from the opening 24 of the skin plate 6 advances together with the skin plate 6 while rotating, and the front roller cutter 4 and the outer peripheral roller cutter 5 of the cutter head 3.
As a result, the bedrock outside the tunnel inner wall 19 excavated is locally excavated, and the excavation space 28 is formed continuously outside the tunnel inner wall 19 in the axial direction of the skin plate 6.

Since the auxiliary bit 25 projects outside the skin plate 6 in front of the backfilling device 21, the backfilling device 21 that advances with the advancement of the skin plate 6 and the skin plate 8 has the auxiliary bit 25. 25 moves forward in the excavated space 28 that has been excavated.
1 makes it possible to excavate hard rock smoothly without hitting the rock.

The auxiliary bit 25 is projected from the skin plate 6 so that the axis O1 of the auxiliary bit 25 is inclined forward at a required angle θ with respect to the axis O of the skin plate 6, so that the driving unit and the like are arranged in the radial direction. In the case of a tunnel excavator which is congested due to a large space limitation, it is possible to secure a wider internal space as compared with projecting the auxiliary bit 25 from the skin plate 6 at a right angle, and the auxiliary bit 25 can be replaced quickly. And the rotation drive device 27 of the auxiliary bit 25 can be used when the tunnel excavator excavates.
The bending load acting on the auxiliary bit 25 is smaller than that of projecting the auxiliary bit 25 from the skin plate 6 at a right angle, and the consolidation of the earth and sand is small, and the wear of the auxiliary bit 25 is suppressed.

It should be noted that the tunnel excavator of the present invention is not limited to the illustrated example described above, and it is needless to say that various modifications can be made without departing from the gist of the present invention.

[0033]

As described above, the first aspect of the present invention is as described above.
According to the described tunnel excavator, even if there is a protruding member on the outer surface of the skin plate, the auxiliary bit digs in front of the protruding member to secure a digging space necessary for advancement of the protruding member, so that an extra large tunnel is required. It is not necessary to excavate, and it is possible to achieve an excellent effect that a hard rock can be excavated smoothly without increasing the propulsion resistance, and the tunnel excavator according to claim 2 of the present invention. According to the above, in addition to the above effects, it is possible to secure a wide internal space and improve the workability of replacing the auxiliary bit, while reducing the bending load acting on the rotary drive device of the auxiliary bit during excavation of the tunnel excavator, In addition, the compaction of the earth and sand is small, and the wear of the auxiliary bit can be suppressed, so that an excellent effect that the life of the device can be extended can be achieved.

[Brief description of the drawings]

FIG. 1 is a cut-away side view showing an example of an embodiment of the present invention.

FIG. 2 is a cut-away plan view showing an example of a conventional shield type tunnel excavator.

FIG. 3 is a rear view as viewed from III-III in FIG. 2;

[Explanation of symbols]

 Reference Signs List 3 cutter head 6 skin plate 7 skin plate 8 skin plate 21 back injection device (projecting member) 25 auxiliary bit 27 rotation drive device O axis O1 axis θ angle

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Junichi Sato 111-1 Kitahama-cho, Chita-shi, Aichi Ishikawajima-Harima Heavy Industries Co., Ltd. (72) Inventor Makoto Sugimori 111-1 Kitahama-cho, Chita-shi, Aichi Ishikawajima Harima Heavy Industries, Ltd. Aichi factory F-term (reference) 2D054 AA05 AD22 BA06 BA25

Claims (2)

[Claims] 1. A tunnel excavator having a cutter head provided on a front surface of a cylindrical skin plate and a projecting member projecting from an outer surface of the skin plate, wherein the tunnel excavator projects from the skin plate in front of the projecting member and rotates. A tunnel excavator comprising an auxiliary bit rotated by a driving device. 2. The tunnel excavator according to claim 1, wherein the auxiliary bit protrudes from the skin plate such that the axis of the auxiliary bit is inclined forward at a required angle with respect to the axis of the skin plate.