JP2808520B2 - Multiple tunnel excavator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multiple tunnel excavator in which a plurality of cutter heads are arranged in an arc shape or a ring shape, and more particularly to discharge of excavated earth and sand.

[0002]

2. Description of the Related Art When excavating and constructing a large tunnel, a tunnel excavator having a plurality of cutter heads arranged in an arc shape or a ring shape, that is, a multiple tunnel excavator is used. FIG. 7 is a sectional view of a main part of a conventional multiple tunnel excavator, and FIG. 8 is a front view of the multiple tunnel excavator.

As shown in FIG. 7 and FIG.
A plurality of rotating shafts 102 are arranged in an arch shape (arc shape) on the front surface of the rotary shaft 01, and a cutter head 103 is fixed to the tip of each rotating shaft 102, while each rotating shaft 1 is fixed.
A driving device 104 is attached to each of the rear ends of the driving members 02. The adjacent cutter heads 103 are alternately shifted in the excavation direction. Further, each of the rotating shafts 102 (the cutter head 10)
On both sides of 3), screw conveyors 1 for discharging excavated earth and sand (shear) 110 into the excavator body 101 respectively.
05 is provided.

Therefore, in such a multiple tunnel excavator, a plurality of cutter heads 103 are rotated by the driving device 104 via the respective rotating shafts 102, and rocks and the like are formed by the rotating cutter heads 103. Excavated.
And the excavated earth and sand 110 is the screw conveyor 1
05 and is carried out by the screw conveyor 105 to the outside. The excavator body 101 moves forward (digs) while digging, and a segment (not shown) is assembled on the inner wall of the arched tunnel formed by excavation at the same time as the digging, and an arched tunnel is formed. In addition, the part left under the arched tunnel (internal residual excavated soil)
Is excavated by a power shovel (not shown) or the like, and a horseshoe-shaped tunnel is constructed.

[0005]

In the conventional multiple tunnel excavator described above, since a plurality of cutter heads 103 are alternately arranged in the excavation direction before and after, the cutter heads 103 are excavated. The flow of the sediment 110 in the carry-out direction is hindered. In this case, the adjacent cutter heads 10 which are arranged to be shifted in the excavation direction front and rear are provided.
In 3, the cutter head 103 on the front side excavates the peripheral portion of the side wall of the cutter head 103 on the rear side, and the earth and sand 11 is placed on the top of the cutter head 103 arranged in an arch shape.
A stagnation zone 111 of zero is created. When the stagnation zone 11 is formed in this manner, there is a problem that the cutter head 103 is closed and cannot be rotated, thereby reducing the excavating ability.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and a multiple tunnel excavator capable of preventing the generation of a stagnation zone of earth and sand and improving the excavating ability and ensuring the stability of the function. The purpose is to provide.

[0007]

In order to achieve the above object, a multiple tunnel excavator according to the present invention has a plurality of cutter heads arranged in an arc shape or a ring shape and adjacent cutter heads are connected to each other. In a multiple tunnel excavator that is disposed to be shifted to the front and rear in the excavation direction and provided with a chamber behind the plurality of cutter heads in the excavation direction, sediment that discharges excavated soil accumulated behind the cutter head into the chamber. A discharge mechanism is provided.

[0008] The multiple tunnel excavator of the present invention comprises:
The earth and sand discharge mechanism is an injection device that injects high-pressure fluid, or a soil discharge plate that extends in the radial direction from the rotation axis of the cutter head, and that extends in the radial direction from the rotation axis of the cutter head and that is in the excavation direction. It is characterized by being a sediment discharge plate that is twisted.

[0009]

By providing the chamber with a sediment discharge mechanism for discharging the excavated sediment behind the cutter head, the excavated sediment flows down without being hindered by the adjacent cutter head, and is arranged in an arc or ring shape. There is no stagnation zone for earth and sand at the top of the plurality of cutter heads provided.

[0010] Further, by using an injection device for injecting high-pressure fluid as the earth and sand discharge mechanism, excavated earth and sand retained behind the cutter head can be reliably discharged simply by adding an injection device without changing the structure of the cutter head. Is done. In addition, the sediment discharge mechanism is a sediment discharge plate that extends radially from the rotation axis of the cutter head or a sediment discharge plate that is twisted backward in the excavation direction, and stays behind the cutter head with a simple structure. Excavated earth and sand is discharged.

[0011]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a sectional view of a cutter head portion showing a sediment discharging mechanism in a multiple tunnel excavator according to an embodiment of the present invention, and FIGS. 2 and 3 show another soil in the multiple tunnel excavator of the present embodiment. FIG. 4 is a cross-sectional view of a cutter head portion showing a discharge mechanism. FIG. 4 is a cross-sectional view of a multiple tunnel excavator of the present embodiment.
6 shows a plan view of the multiple tunnel excavator, and FIG. 6 shows a plan view of the multiple tunnel excavator.

As shown in FIGS. 4 to 6, a plurality of rotary shafts 12 are arranged in an arch shape (arc shape) on the front surface of a cylindrical excavator body 11, and each rotary shaft 12 has a distal end. Each of the cutter heads 13 is fixed, and a drive device 14 is attached to the rear end of each rotary shaft 12. Adjacent cutter heads 13 are alternately displaced from each other in the excavation direction, and a chamber 15 is provided behind the cutter head 13 in the excavation direction. Each of the rotating shafts 12 (cutter head 13) arranged in an arch shape
On both sides of the excavator body 11
The screw conveyor 17 for discharging the excavated earth and sand (shear) 30 is provided in each of the leading bolts 6.

Reference numeral 18 denotes a segment assembled on the inner wall of the arched tunnel. Reference numeral 19 denotes a power shovel for excavating and carrying out the internal residual excavated soil 31 left below the arched tunnel.

Therefore, in such a multiple tunnel excavator, rocks and the like are excavated by the cutter head 13 by rotating the plurality of cutter heads 13 via the rotary shaft 12 by the driving device 14. The excavated earth and sand 30 flows down onto the screw conveyor 17 and is carried out by the screw conveyor 17 to the outside. And the excavator body 1
1 advances while performing excavation, and at the same time as excavation, the segment 18 is assembled on the inner wall of the arched tunnel formed by excavation to form an arched tunnel. On the other hand, the part (inner soil remaining) 31 remaining below the arched tunnel
Is excavated and carried out by the power shovel 19 to construct a horseshoe-shaped tunnel.

In this embodiment, as shown in FIG.
Sediment discharging mechanism 2 that discharges excavated sediment 30 remaining behind cutter head 13 into chamber 15 of excavator body 11.
An injection device for injecting a high-pressure fluid as 1 is provided. That is, a plurality of spray nozzles 22 are attached to the wall surface of the chamber 15 toward the rear side of the cutter head 13, and each of the spray nozzles 22 is connected to a water pump 24 by a water pipe 23. An operation valve 25 is provided in the middle of the water supply pump 24.

Therefore, during the excavation work by the plurality of cutter heads 13, the excavated earth and sand 30 tends to stay at the top of the cutter head 13 arranged in an arch shape. However, high-pressure water (compressed air) is supplied from the water supply pump 24 to each of the injection nozzles 22 via the water supply pipe 23, and the high-pressure water is injected from the injection nozzles 22, so that the cutter head 13 is discharged.
The excavated earth and sand 30 accumulated on the rear side of the cutter head 13 properly flows down onto the screw conveyor 17 due to the high-pressure water, so that an earth and sand accumulation zone is not generated at the top of the cutter head 13.

In the above-described embodiment, the earth and sand discharging mechanism 21 is an injection device for injecting a high-pressure fluid. However, the invention is not limited to this. For example, in the embodiment shown in FIG.
Is provided with a sediment discharge plate 26. That is, a plurality of earth and sand discharge plates 26 extending in the radial direction are attached to the rotating shaft 12 of the cutter head 13 located on the front side in the excavation direction at positions shifted in the axial direction, respectively.

Therefore, during excavation work by the plurality of cutter heads 13, the excavated earth and sand 30 tends to stay at the top of the cutter head 13 arranged in an arch shape. However, the rotation of the plurality of earth and sand discharge plates 26 attached to the rotating shaft 12 together with the cutter head 13 causes the cutter head 1 to rotate.
The excavated earth and sand 30 remaining behind the earth 3
And flows down onto the screw conveyor 17 appropriately.

Further, in the embodiment shown in FIG. 3, a sediment discharge plate 27 is provided as a sediment discharge mechanism 21 in the chamber 15 of the excavator body 11. In other words, a plurality of earth and sand discharge plates 27 extending in the radial direction are attached to the rotation shaft 12 of the cutter head 13 located on the front side in the excavation direction at positions shifted from each other in the axial direction. The earth and sand discharge plate 27 has a curved structure twisted backward in the excavation direction.

Therefore, during excavation work by the plurality of cutter heads 13, the excavated earth and sand 30 tends to stay at the top of the cutter head 13 arranged in an arch shape. However, the rotation of the plurality of earth and sand discharge plates 27 attached to the rotating shaft 12 together with the cutter head 13 causes the cutter head 1 to rotate.
3 excavated earth and sand 30 that is retained on the rear side
As a result, it is scraped out in the excavation direction and flows down onto the screw conveyor 17 appropriately.

In the embodiment described above, the cutter head 13 is arranged in an arc shape.
The present invention is not limited to this, and may be applied to a cutter head 13 arranged in a ring shape.

[0023]

As described above, according to the multiple tunnel excavator of the present invention, a plurality of cutter heads are arranged in an arc shape or a ring shape, and adjacent cutter heads are connected to each other. Are displaced from each other in the digging direction, and a plurality of cutter heads are provided with a sediment discharging mechanism for discharging digging sediment remaining behind the cutter head in a chamber provided in the digging direction behind the cutter head. Excavated sediment that accumulates on the rear side will be discharged to the outside by this sediment discharge mechanism, excavated sediment will flow without being blocked by the adjacent cutter head without falling, and a sediment retention zone will be created at the top I will not do it.
As a result, the clogging state does not occur on the top portion, and the rotation ability due to the inability of the cutter head to rotate is not reduced, so that the excavation ability can be improved and the stability of the function can be ensured.

[0024] Further, by using a high-pressure fluid injection device as the earth and sand discharging mechanism, the high-pressure fluid can be injected into the excavated earth to easily prevent the stagnation of the excavated earth and to reduce the structure of the cutter head. Excavated earth and sand remaining behind the cutter head can be reliably discharged only by adding an injection device without any change. Furthermore, by using the earth and sand discharge mechanism as the earth and sand discharge plate extending in the radial direction from the rotation axis of the cutter head, it is possible to scrape out the excavated earth and sand retained behind the cutter head with a simple structure. By having the plate twisted rearward in the excavation direction, excavated earth and sand retained behind the cutter head can be scraped out and discharged while moving backward.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a cutter head portion showing a sediment discharging mechanism in a multiple tunnel excavator according to one embodiment of the present invention.

FIG. 2 is a sectional view of a cutter head portion showing another earth and sand discharging mechanism in the multiple tunnel excavator of the present embodiment.

FIG. 3 is a sectional view of a cutter head portion showing another earth and sand discharging mechanism in the multiple tunnel excavator of the present embodiment.

FIG. 4 is a cross-sectional view of the multiple tunnel excavator of the present embodiment.

FIG. 5 is a plan view of the multiple tunnel excavator.

FIG. 6 is a plan view of the multiple tunnel excavator.

FIG. 7 is a sectional view of a main part of a conventional multiple tunnel excavator.

FIG. 8 is a front view of a conventional multiple tunnel excavator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Excavator main body 12 Rotary axis 13 Cutter head 15 Chamber 21 Injection device (sediment discharge mechanism) 22 Injection nozzle 26, 27 Sediment discharge plate (sediment discharge mechanism)

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kazuyuki Okamoto 1-1-1, Wadazakicho, Hyogo-ku, Kobe City, Hyogo Prefecture Inside Mitsubishi Heavy Industries, Ltd.Kobe Shipyard (72) Inventor Takeshi Matsuura Hyogo, Hyogo Prefecture 1-1-1 Wadasaki-cho, Ward Mitsubishi Heavy Industries, Ltd. Kobe Shipyard (58) Field surveyed (Int. Cl. ⁶ , DB name) E21D 9/10 E21D 9/00

Claims (4)

(57) [Claims] 1. A plurality of cutter heads are arranged in an arc shape or a ring shape, and adjacent cutter heads are arranged to be shifted from each other back and forth in an excavation direction, and a chamber is provided behind the plurality of cutter heads in an excavation direction. A multiple tunnel excavator, comprising: a plurality of tunnel excavators, wherein a sediment discharging mechanism that discharges excavated sediment remaining behind the cutter head is provided in the chamber. 2. The multiple tunnel excavator according to claim 1, wherein the earth and sand discharging mechanism is an injection device for injecting a high-pressure fluid. 3. The multiple tunnel excavator according to claim 1, wherein the earth and sand discharging mechanism is a earth and sand discharging plate extending in a radial direction from a rotation axis of the cutter head. . 4. The multiple tunnel excavator according to claim 1, wherein the earth and sand discharging mechanism is a earth and sand discharging plate extending radially from the rotation axis of the cutter head and twisted backward in the direction of excavation. Multiple tunnel excavator.