JPH08260886A - Arch excavator in arch sectional shield machine - Google Patents

Abstract

PURPOSE: To place primary lining concrete into an outbreak cavity section by outbreak- excavating a bedrock in front of the front end face of a skin plate and on the outer circumferential section of the skin plate on the outer circumferential section of the front end section of a shield machine. CONSTITUTION: An excavating unit truck 6 is installed along the arch of the front end section of an arch type skin plate 2 in a freely driving-travelling manner at the front end section of the skin plate 2, and a pair of shafts, in which internal excavating cutter heads 4 and external excavating cutter heads 5 are mounted at front ends respectively, are bone rotatably on both side sections of a driving main shaft 11 in parallel with the driving main shaft 11 in an angle variable box 12. Both shafts of the internal excavating and external excavating cutter heads 4, 5 are linked with the driving main shaft 11 through a power transmission mechanism in the angle variable box 12. The driving main shaft 11 is borne onto the excavating unit truck 6 rotatably and by a hydraulic motor 14 for driving a cutter in a manner that the driving main shaft 11 can be rotated and driven. A spline cylindrical shaft 15 is fitted rotatably on the outer circumference of the driving main shaft 11, and a worm gear turned by a speed-reducing driving machine is engaged with a spline gear on the outer circumference.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an arch excavator which is installed at a tip of a shield machine having an arch type cross section to excavate the ground in an arch type.

[0002]

2. Description of the Related Art Conventionally, an arch excavator provided at the tip of a skin plate of a shield machine having an arch type cross section excavates the ground into a tunnel arch type, and the excavation gap is provided at the lower ends of both sides of the shield machine. Is discharged to the rear for a required span to excavate the ground inside the shield machine 1, and a movable form is installed behind the excavated portion to cover the ground. There is known a tunnel construction method in which a shield machine is propelled by using a supporting member such as the above as a reaction force so that the same steps are repeated continuously (Japanese Patent Laid-Open No. 5-33584).

[0003]

In the conventional tunnel construction method described above, a movable formwork for lining with cast-in-place concrete is assembled at the rear part of the shield machine, or after lining, it is disassembled and moved forward. Had to be transported,
Therefore, there was a problem that a lot of labor and equipment were required.

[0004]

In order to solve the above-mentioned conventional problems, the present invention installs an excavation unit carriage 6 at the tip of an arch-shaped skin plate 2 so as to be able to drive along the arch, and to excavate the excavation unit cart 6. A unit carriage 6 is provided with a pair of rotary shafts 9 and 10 each having an inner cutter head 4 and an outer cutter head 5 attached to the tip thereof, and an angle variable box 12 having a central portion rotatably attached to the tip of a drive spindle 11. It is rotatably supported on both sides of the drive spindle 11 in parallel.
Both rotary shafts 9 and 10 of inner and outer cutter heads 4 and 5
Is linked to the drive spindle 11 via a power transmission mechanism in the variable angle box 12, and the drive spindle 11 is rotatably supported on the excavation unit carriage 6 and is rotatably driven by the cutter driving hydraulic motor 14. A spline cylinder shaft 15 attached to the rotation center of the variable angle box 12 is rotatably fitted on the outer periphery of the spline gear. The spline cylinder shaft 15 is formed by meshing a worm gear 18 rotated by a reduction drive unit 17 with a spline gear of the outer periphery. The present invention proposes an arch excavator in an arch cross section shield machine.

[0005]

By appropriately rotating the worm gear 18 by the reduction drive 17, the variable angle box 12 is rotated together with the spline cylinder shaft 15 about the drive main shaft 11,
The outer cutting cutter head 5 is moved so that a part of its outer circumference is located outside the skin plate 2, and the inner cutting cutter head 4 is moved to a position where its outer circumference is close to the inner circumference of the skin plate 2.

In this state, the cutter driving hydraulic motor 1
4, the inner cutter head 4 and the outer cutter head 5
By driving the excavation unit carriage 6 along the arch while rotating, the ground is expanded to the outside of the front side of the skin plate 2 and the outer peripheral portion thereof to excavate in a tunnel arch type.

When the arch excavator 3 moves to the lower ends of both sides of the skin plate 2, the reduction gear drive 17 rotates the worm gear 18 in the opposite direction to return the variable angle box 12 together with the spline cylinder shaft 15. By this, after returning the inner and outer excavation cutter heads 4 and 5 to a state substantially parallel to the skin plate 2, the arch excavator 3 is allowed to escape to the advanced guide hole 25, and in this state, the shield machine 1 is moved to the tip of the excavation portion. And then the concrete is poured and filled into the cavity of the overdug formed between the skin plate 2 and the excavated ground, and the arch excavator 3 is driven again in a hardened state in which this concrete develops the required strength. By excavating the ground in a tunnel arch type and repeating the same process, the primary lining can be sequentially constructed in parallel with the excavation without using a formwork. .

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A shield machine 1 is an arch excavator which excavates the front of a skin plate 2 having an inner and outer double cross section with an arched cross section as shown in FIGS. 4 and 5, following the arch of the skin plate 2. 3 are installed.

As shown in FIGS. 1 to 3, the arch excavator 3 has at least a pair of inner excavating cutter head 4 and outer excavating cutter head 5 at its tip between the tip portions of the inner and outer double skin plates 2a, 2b. One or two excavation unit trucks 6 provided so as to be driven and driven in the arch direction are installed, and the excavation unit truck 6 is driven and run in the arch direction while rotating the cutter heads 4 and 5, whereby the front side of the skin plate 2 is moved. It is configured such that the natural ground is expanded to the outside of the outer peripheral portion of the skin plate 2 and excavated in an arch shape.

The excavator unit truck 6 has a required number of rollers 7 attached to the upper or lower surface thereof so as to come into contact with the outer or inner skin plates 2a and 2b, and the front and rear portions thereof have an arch direction on the inner surfaces of the skin plates 2a and 2b. A required number of rollers 7'that come into contact with the guide rails 8 provided along the above are attached, and the rollers 7'are supported by these rollers 7, 7'and are installed so as to run in the arch direction.

The cutter heads 4 and 5 rotate in parallel to the drive spindle 11 on both sides thereof in an angle variable box 12 in which the central portions are rotatably attached to the tips of the drive spindle 11, respectively. It is supported freely.

The drive main shaft 11 is rotatably supported by a bearing 13 installed in the center of the excavation unit carriage 6, and is rotationally driven by a cutter driving hydraulic motor 14 connected to the rear end of the excavating unit carriage 6, and its tip end portion. A spline cylinder shaft 15 attached to the rotation center of the variable angle box 12 is rotatably fitted on the outer periphery.

The spline cylinder shaft 15 is rotatably supported by a bearing 16, and a worm gear 18 rotated by a reduction drive unit 17 meshes with a spline gear on its outer periphery. By appropriately rotating the worm gear 18,
The variable angle box 12 together with the spline cylinder shaft 15 is rotated about the drive spindle 11 by an arbitrary angle from an angle substantially parallel to the skin plate 2 to a position perpendicular to the skin plate 2, so that the outer cutting cutter head 5 has a part of the outer periphery of the skin plate 2. It is designed to move so that it is located outside.

A rotary shaft 20 having traveling sprockets 19 mounted thereon is supported by brackets 22 so as to be rotated by a cutter traveling hydraulic motor 21 on the left and right sides of the excavating unit carriage 6, and the traveling sprockets 19 are skin plates. The excavation unit truck 6 is configured to move forward and backward in the arch direction of the skin plate 2 by being meshed with a chain 23 attached to either one of the 2a and 2b along the arch direction and rotating forward and backward.

In the vicinity of the rear ends of the cutter heads 4 and 5, there is provided a slide-out conveyor 24 which circulates along the skin plate 2b.

A method of constructing a tunnel using the shield machine 1 configured as described above will be described. First, the worm gear 18 is appropriately rotated by the reduction drive 17 to drive the variable angle box 12 together with the spline cylinder shaft 15. It rotates about the main shaft 11 and moves the excavation cutter head 5 so that a part of its outer circumference is located outside the skin plate 2.

As shown in FIG. 2, advanced guide shafts 25 are constructed in front of the lower ends of both sides of the shield machine 1, and the shield machine 1 is advanced along the rails 27 laid on the side wall portions 26 formed here. At the same time, by rotating the cutter heads 4 and 5 of the arch excavator 3 to drive the excavation unit truck 6 from the top end of the skin plate 2 toward the lower ends of both sides of the arch, the ground in front of the skin plate 2 can be moved. Of the skin plate 2 is expanded to the outside of the outer peripheral portion and excavated in an arch shape.
Slipper carry-out conveyor 2 installed along the arch behind
4, the arch excavator 3 is conveyed to the lower end portions on both sides, and is discharged from the discharge port 28 by a slip-out vehicle or the like.

Next, the cutter heads 4 and 5 together with the variable angle box 12 are returned to a state substantially parallel to the skin plate 2, and then the arch excavator 3 is moved to the lower ends of both sides of the skin plate 2 to advance the advanced guide of that portion. After escaping to the pit 25, the shield machine 1 is advanced to the tip of the excavation part (the pinion rack type wheels driven by the motor drive the rails to run), which causes between the skin plate 2 and the excavated ground. Concrete 30 is injected and filled in the hollow portion 29 of the overditch, and the arch excavator 3 is driven again in a hardened state in which the concrete 30 develops a required strength to excavate the ground in a tunnel arch type, and the same process as above. By repeating the procedure, the primary lining (temporary lining) is sequentially constructed in parallel with the excavation.

In this way, after excavating to a position where the ground inside the shield machine 1 is self-sustaining, the excavation is stopped and the ground inside the shield machine 1 is excavated to a required position by the rear main body excavating device 31. .

In the rear of the sealing machine 1, a main lining is performed with a center or the like.

[0021]

As described above, according to the present invention, by appropriately rotating the worm gear by the reduction drive, the variable angle box is rotated around the drive main shaft together with the spline cylinder shaft, and the excavation cutter head is rotated around the outer periphery thereof. A part of it can be moved to the outside of the skin plate and the inner cutter head can be moved to a position where its outer circumference is close to the inner circumference of the skin plate. By driving the excavation unit truck along the arch while rotating the inner excavation cutter head and the outer excavation cutter head, the ground excavation is expanded to the front of the skin plate and outside of the outer periphery of the skin plate to excavate in a tunnel arch type. can do.

Further, by rotating the worm gear in the opposite direction to the above by the reduction drive, the variable angle box is rotated back together with the spline cylinder shaft, thereby making the inner and outer cutter heads substantially parallel to the skin plate. In this state, the arch excavator escapes to the advanced guideway and the shield machine is advanced to the tip of the excavation part, which injects concrete into the cavity of the overdue formed between the skin plate and the excavation ground. It is possible to fill and sequentially build primary linings on the outer periphery of the skin plate without the need for a formwork.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view of an arch excavator of the present invention.

FIG. 2 is a plan view of the arch excavator of the present invention.

FIG. 3 is a front view of the arch excavator of the present invention.

FIG. 4 is a vertical sectional side view showing a construction state by the arch excavator of the present invention.

FIG. 5 is a vertical sectional front view of the shield machine according to the present invention.

[Explanation of symbols]

 1 shield machine 2 skin plate 2a outer skin plate 2b inner skin plate 3 arch excavator 4 inner excavation cutter head 5 outer excavation cutter head 6 excavation unit trolley 7 roller 7'roller 8 guide rail 9 rotary shaft 10 rotary shaft 11 drive shaft 12 Variable angle box 13 Bearing 14 Cutter drive hydraulic motor 15 Spline cylinder shaft 16 Bearing 17 Reduction drive 18 Worm gear 19 Travel sprocket 20 Rotation shaft 21 Cutter travel hydraulic motor 22 Bracket 23 Chain 24 Sliding conveyor 25 Advanced guide shaft 26 Side wall 27 Rail 28 Discharge port 29 Cavity 30 Concrete 31 Main body excavator

Front page continuation (71) Applicant 000000974 Kawasaki Heavy Industries, Ltd. 3-1-1 Higashikawasaki-cho, Chuo-ku, Kobe-shi, Hyogo Prefecture (72) Inventor Kunio Nabeda 2--1026 Fujimi, Chiyoda-ku, Tokyo Maeda Construction Industry Co., Ltd. Incorporated (72) Inventor Tadashi Tadama Maeda Construction Industry Co., Ltd. 2-1026 Fujimi, Chiyoda-ku, Tokyo (72) Inventor Seiji Ebiko 387 Ohsuna, Tsukuba, Ibaraki Okumuragumi Tsukuba Co., Ltd. Inside the Research Institute (72) Gen Hamada, 3-5-8 Hamaguchi Nishi, Suminoe Town, Osaka City, Osaka Prefecture, Okumura Gumi Technical Research Institute (72) Inventor Tsutomu Matsuo, 2-1 Tsukudo Town, Shinjuku-ku, Tokyo Inside Kumagaya Gumi Co., Ltd. (72) Inventor Shinichi Sugiyama 3-1-1 Higashikawasaki-cho, Chuo-ku, Kobe-shi, Hyogo Kawasaki Heavy Industries Ltd. Kobe factory

Claims (1)

[Claims] 1. A pair of excavation unit carriages are installed at the tip of an arch-shaped skin plate so as to be freely driven along the arch, and an inner cutter head and an outer cutter head are respectively attached to the tip of the excavator unit carriages. The rotary shaft of is rotatably supported on both sides of the drive shaft in parallel to the drive shaft by a variable angle box whose central portion is rotatably attached to both ends of the inner and outer cutter heads. The shaft is linked to the drive main shaft in the angle variable box via a power transmission mechanism, and the drive main shaft is rotatably supported on the excavation unit carriage and rotatably driven by a cutter driving hydraulic motor, and its outer periphery is supported. A spline cylinder shaft attached to the rotation center of the variable angle box is rotatably fitted to the shaft, and the spline cylinder shaft is reduced to an outer spline gear. An arch excavator in an arch cross-section shield machine characterized by meshing a worm gear rotated by a high speed drive machine.