JPH06212878A - Shield excavatr - Google Patents

Abstract

PURPOSE:To improve the excavation directionality of a shield excavator and improve the excavation lining work efficiency. CONSTITUTION:A circular outside cutter 3 rotated by a driving device 2 is mounted to the front of an outside cylindrical body 1 through a bearing 4 in a rotatable manner, and the central cutter 6 rotated by a driving device 5 is placed to the central part of the circula outside cutter 3. The central cylindrical body 8 bearing the central cutter 6 through a bearing 7 and a bearing member 9 fixed to the outside cylindrical body 1 are connected to each other with a central cutter moving jack 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shield machine used when excavating a shield tunnel.

[0002]

2. Description of the Related Art Conventionally, as a shield machine, one disclosed in Japanese Patent Publication No. 63-54876 is known.

[0003]

In the case of the conventional shield machine, the entire section of the tunnel is excavated, so that the controllability in the excavation direction is poor and the segment is assembled unless the entire excavation section is advanced. Because I can't
There is a drawback that the work efficiency of the digging lining is poor.

[0004]

In order to advantageously solve the above-mentioned problems, in the shield machine of the present invention, an annular outer cutter 3 rotated by a drive device 2 is provided at the front portion of the outer cylinder body 1. A central cutter 6 which is rotatably mounted via a bearing 4 and is rotated by a drive device 5 is arranged in the central portion of the annular outer cutter 3, and the central cutter 6 is supported via a bearing 7. The tubular body 8 and the support member 9 fixed to the outer tubular body 1 are connected by a central cutter moving jack 10.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT The drawings show an embodiment of the present invention.
An annular outer cutter 3, which is rotated by a drive device 2 including an electric motor with a speed reducer, is rotatably attached to a front portion of an outer cylindrical body 1 having a circular cross section through a bearing 4, and a central cylindrical body 8 having a circular cross section is formed. , Is inserted into the circular hole of the annular outer cutter 3 and the support cylinder 11 fixed to the outer cylinder body 1 behind the circular hole so as to be slidable back and forth, and is fixed inside the middle portion of the outer cylinder body 1. For moving a plurality of hydraulic central cutters, which are arranged at intervals in the circumferential direction of the central tubular body 8 between the bearing member 9 and a bearing ring 12 fixed inside the intermediate portion of the central tubular body 8. The jack 10 is interposed, the front end of the central cutter moving jack 10 is fixed to the bearing ring 12, and the rear end of the central cutter moving jack 10 is
The pin 13 is attached to the bracket fixed to the support member 9.
Are connected by.

A central cutter 6 is provided at the front end of the central cylindrical body 8.
Is rotatably mounted via a bearing 7, and a drive unit 5 composed of an electric motor with a speed reducer is fixed to a front end plate 14 of the central cylindrical body 8 and is fixed to an output shaft of the drive unit 5. The gear 15 meshes with an annular driven gear 16 fixed to the central cutter 6, and the drive gear 17 fixed to the output shaft of the driving device 2 meshes with an annular driven gear 18 fixed to the annular outer cutter 3. The drive device 2 rotates the annular outer cutter 3 via the drive gear 17 and the annular driven gear 18, and the drive device 5 causes
The central cutter 6 is rotated via the drive gear 15 and the annular driven gear 16.

The plurality of outer cylinder body moving jacks 19 are arranged at intervals in the circumferential direction of the outer cylinder body 1 at positions close to the inner surface of the outer cylinder body 1, and the outer cylinder body moving jacks 19 are arranged. The front end portion of the outer cylinder body 1 is fixed to an intermediate ring 20 fixed to an intermediate portion of the outer cylinder body 1, and the outer cylinder body moving jack 19 is fixed.
The rear part is inserted through the support member 9, and the rear part of the outer cylinder body moving jack 19 is provided with an engaging member 22 which is engaged with the front surface of a segment 21 arranged at the rear part of the outer cylinder body 1. They are connected via a joint 23.

In the earth unloading pipe 24, an earth unloading screw 26 rotated by a drive unit 25 composed of an electric motor with a speed reducer.
Is housed to form an earth cutter earth unloading device 27,
A front end portion of the outer cutter earth unloading device 27 is inserted and fixed in a lower portion of an annular partition wall 28 between the outer cylinder body 1 and the supporting cylinder body 11, and a discharge port provided at a rear end portion of the earth unloading pipe 24. 29
The opening / closing lid 3 that is moved by the opening / closing telescopic cylinder 30
1 is provided, and the soil discharging device 27 for the outer cutter has a front horizontal portion and a rear inclined portion that is inclined rearward from a rear end portion of the front horizontal portion. A universal joint (not shown) is provided on the earth discharging screw 26 at the boundary between the portion and the rear inclined portion.

A drive unit 33, which is an electric motor with a reduction gear, is provided in an earth-draining pipe 32 that is inclined upward from the front to the rear.
The earth excavating screw 34 rotated by is accommodated to configure a central cutter earth removing device 35, and a front end portion of the central cutter earth removing device 35 is inserted and fixed to the front end plate 14 to form the earth ejecting pipe. A discharge port 36 provided at the rear end of 32
The opening / closing lid 3 moved by the opening / closing telescopic cylinder 37
8 are provided.

Between the support member 9 and the intermediate ring 20, a plurality of openings 39 are provided in the outer cylindrical body 1 at intervals in the circumferential direction of the outer cylindrical body 1, and a reaction force is applied to the opening 39. A bearing stopper 40 is slidably fitted, and the casing 41 fixed in the outer cylindrical body 1 and the reaction force bearing stopper 40 are continuous via a moving hydraulic cylinder 42.

At the rear portion of the annular outer cutter 3, two copy cutters 43 are arranged on the diameter line of the annular outer cutter 3, and the cylinder 4 to which the copy cutter 43 is fixed.
4 is slidably fitted to a bearing 45 fixed to the annular outer cutter 3, and a piston rod 46 fitted to the cylinder 44 is pin-coupled to a bracket fixed to the annular outer cutter 3.

When changing the excavation direction, the annular outer cutter 3 is repeatedly rotated by 180 °, and the cylinder 44 and the piston and piston rod 46 fitted therein are used to
As shown in FIG. 7, the copy cutter 43 gradually protrudes over a range of 90 ° on the peripheral surface of the annular outer cutter 3 and gradually retracts over a range of subsequent 90 °.

When excavating using the shield excavator constructed as described above, first, from the state shown by the solid line in FIG. 1, the central cutter 6 is rotated by the driving device 5 to excavate the central hole. , Central cutter moving jack 10
To move the central cutter 6 and the central cylindrical body 8 forward,
In addition, the segment 21 is assembled by using the erector 47 at the rear part of the outer cylindrical body 1 to form a segment ring, and after the central cutter 6 excavates a predetermined distance, the forward movement and rotation of the central cutter 6 are stopped.

Next, with the engagement member 22 at the rear portion of the outer cylinder moving jack 19 engaged with the front end face of the segment lining 48 composed of the segment rings arranged in series, the drive device 2 drives the annular outer cutter. 3 is rotated to excavate the annular hole, and the outer tubular body 1 and the annular outer cutter 3 are moved forward by the outer tubular body moving jack 19. Then, after the annular outer cutter 3 moves forward to a position close to the central cutter 6, the forward movement and rotation of the annular outer cutter 3 are stopped. The excavated material by the central cutter 6 is discharged by the central cutter soil discharging device 35, and the excavated material by the annular outer cutter 3 is discharged by the outer cutter soil discharging device 27. When moving the central cutter 6 forward,
The reaction force bearing stopper 40 may be pressed into the ground around the outer cylinder 1.

When changing the excavation direction, the copy cutter 43 is arranged in the excavation direction change direction, and the annular outer cutter 3 is arranged.
Is rotated about 180 ° and the copy cutter 43 is projected as shown in FIG.

[0016]

According to the present invention, the annular outer cutter 3 rotated by the drive device 2 is provided at the front portion of the outer cylindrical body 1, and the bearing 4 is provided.
A central cutter 6 which is rotatably attached via a drive device 5 is disposed in the central portion of the annular outer cutter 3, and the central cutter 6 is supported by a bearing 7 in a central cylindrical body 8. Since the support member 9 fixed to the outer cylindrical body 1 is connected by the central cutter moving jack 10, the small diameter central cutter 6 is advanced first, and then the large diameter annular outer cutter 3 is advanced. By doing so, the shield machine can be accurately advanced in a predetermined direction, and by advancing the central cutter 6 while assembling the segments at the rear part of the outer tubular body 1, the efficiency of the digging lining work is improved. Further, since the entire cross section is excavated separately by the central cutter 6 and the annular outer cutter 3, it is possible to obtain the effect that the excavation capacity and the propulsion capacity per operation are small.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view showing a shield machine according to an embodiment of the present invention.

FIG. 2 is a front view of FIG.

FIG. 3 is a vertical cross-sectional side view showing a front portion of FIG. 1 in an enlarged manner.

FIG. 4 is a vertical cross-sectional side view showing the upper portion of FIG. 3 in an enlarged manner.

FIG. 5 is a vertical cross-sectional side view showing a lower portion of FIG. 3 in an enlarged manner.

FIG. 6 is a vertical sectional side view showing a reaction force bearing stopper.

FIG. 7 is a front view showing the locus of the copy cutter.

[Explanation of symbols]

 1 Outer Cylinder 2 Drive Device 3 Annular Outer Cutter 4 Bearing 5 Drive Device 6 Center Cutter 7 Bearing 8 Center Cylinder 9 Supporting Member 10 Central Cutter Moving Jack 11 Supporting Cylinder 12 Supporting Ring 13 Pin 14 Front End Plate 15 Drive Gear 16 Annular driven gear 17 Drive gear 18 Annular driven gear 19 Outer cylinder body moving jack 20 Intermediate ring 21 Segment 22 Engaging member 23 Ball joint 24 Earth dump pipe 25 Drive device 26 Earth dumping screw 27 Outer cutter earth draining device 28 Ring Partition wall 29 Discharge port 30 Opening / closing telescopic cylinder 31 Opening / closing lid 32 Exhaust pipe 33 Drive device 34 Excavating screw 35 Central cutter earth removing device 36 Exhaust port 37 Opening / closing expandable cylinder 38 Opening / closing lid 39 Opening 40 Reaction force bearing stopper 41 Casing 42 Hydraulic cylinder for movement 43 Copy cutter 44 Siri Da 45 bearing 46 piston rod 47 erector 48 segment lining

Front page continuation (72) Inventor Yasutaka Kodama 2-16-31 Okubo, Shinjuku-ku, Tokyo (72) Inventor Junichi Shikaura 500-1 Hongocho, Funabashi City, Chiba Prefecture Rene Nishi-Funabashi -910 (72) Inventor Daisuke Kiuchi Chiba 3-5-12 Inohana, Chuo-ku, Chiba, Japan

Claims (1)

[Claims] 1. An outer cutter 1 which is rotated by a drive unit 2 is rotatably attached to a front portion of an outer cylinder 1 through a bearing 4, and a central cutter 6 which is rotated by a drive unit 5.
A central cylindrical body 8 which is disposed in the central portion of the annular outer cutter 3 and supports the central cutter 6 via a bearing 7.
A shield machine having a support member 9 fixed to the outer cylinder 1 and a supporting member 9 connected by a central cutter moving jack 10.