JP2576363Y2 - Shield machine - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shield machine for excavating a tunnel having an irregular cross section.

[0002]

2. Description of the Related Art Conventionally, a tunnel for a subway, a road, and a tunnel for water supply and sewage generally have a circular cross section. However, in recent years, with the increase of underground structures due to overcrowding in urban areas, tunnels having a sectional shape adapted to the situation are required. In particular, a reduction in excavation width is required due to land compensation and restrictions on the separation of existing buried objects, and a shield excavator that enables excavation of a tunnel with a free cross section has been proposed in order to satisfy such requirements.

[0003]

However, a conventional shield machine capable of excavating a tunnel having a free cross section has a complicated structure such as having a plurality of swing arms provided with a rotation cutter separately from a main rotating cutter. Above, because the bulkhead that takes in excavated soil is narrow due to the structure, the excavation speed cannot be increased due to the limitation of the amount of sediment taken in, or the sediment is blocked in the chamber, making it difficult to carry out the sediment. There was a problem. The present invention has been made in order to improve such a problem, and an object of the invention is to provide a shield machine capable of excavating a deformed section with a simple configuration.

[0004]

In order to achieve the above object, the present invention provides a shield excavator which excavates by rotating a cutter head provided at a front portion of a shield body.
A plurality of spokes provided in the radial direction at the front part of the cutter head are formed from inner spokes and outer spokes swingably provided at the outer ends of these inner spokes, and each outer spoke is The swing motor can be swung by a swing motor provided for each of the outer spokes.

[0005]

According to the above-described structure, the outer spoke is controlled to swing according to the cross-sectional shape of the tunnel to be excavated during excavation, so that a tunnel having a free cross section can be easily excavated.

[0006]

An embodiment of the present invention will be described in detail with reference to the drawings. 1 is a sectional view of a shield machine, FIG. 2 is a perspective view of a cutter head, and FIGS. In FIG. 1, reference numeral 1 denotes a shield body, and a cutter head 2 is rotatably provided at a front portion.

The cutter head 2 has a center shaft 3 rotatably supported at the center of the shield main body 1. At the end of the center shaft 3, an inner circumferential spoke 2a is provided in a cross direction. The tip of each inner spoke 2a is integrated with the intermediate beam 2b, the rear end of the intermediate beam 2b is fixed to the rotating ring 2c, respectively, and at the intersection of each inner spoke 2a and the intermediate beam 2b. Are formed with concave steps 2d, and these concave steps 2d are provided with outer spokes 2e.
Are fitted at the inner peripheral ends of the inner and outer surfaces.

[0008] The outer spoke 2e is an inner spoke 2a.
Is formed in an arc shape so that the inner peripheral end is easy to oscillate, and the inner peripheral end of the oscillating shaft 4 provided so as to penetrate through the intermediate beam 2b. It is fixed to the front end. As shown in FIG. 1, the rear end of the swing shaft 4 penetrates through the rotary ring 2c and protrudes into the shield body 1, and a swing motor 5 is connected to the rear end. The outer spokes 2e through the swing shaft 4
Can swing about 90 ° in the AB direction in FIG.

On the other hand, a rotary ring 2c of the cutter head 2 is rotatably supported via a bearing 7 on a partition wall 1a provided at a front portion of the shield body 1, and the rotary ring 2c.
The pinion 9 of the cutter head motor 8 attached to the partition wall 1a is meshed with the ring gear 2f formed on the partition c, so that the cutter head motor 8 can rotate the cutter head 2 in either left or right direction. . The inside of the cutter head 2 is a bulkhead 10 separated by a partition wall 1a, so that earth and sand excavated by the cutter head 2 can be taken in, and both sides of the inner spoke 2a and the outer spoke 2e. As shown in FIG. 3, a large number of cutters 11 are attached at intervals in the radial direction so that a face can be excavated in either left or right rotation.

Next, when the tunnel 13 having a circular cross section is excavated as shown in FIG. 4A, the outer spokes 2e are held so as to be aligned with the inner spokes 2a. In this state, excavation may be performed while rotating the cutter head 2 by the cutter head motor 8. When the tunnel 14 having the horseshoe-shaped cross section shown in FIG. 4B is excavated, the outer spoke 2e is replaced with the inner spoke 2 as shown in FIG.
When the small arc-shaped portion 14b is excavated from the straight portion 14c below the tunnel, the outer spoke 2e is gradually swung by the swing motor 5 as shown in FIG. And the small arc-shaped portion 14b is excavated, and the inner circumferential spoke 2 is provided between the second half of the straight portion 14c and the small arc-shaped portion 14b.
The outer spoke 2e is held at substantially 90 ° with respect to a.
This makes it possible to continuously excavate the core portion 14a, the small arc-shaped portion 14b, and the straight portion 14c.

Next, in the case of excavating a tunnel 15 having an elliptical cross section which is long in the vertical direction shown in FIG. 4 (c), the outer spokes 2e are similarly swung so that the small circular arc-shaped portion 15
B and the straight portion 15c may be continuously excavated, and a tunnel 16 having a rectangular cross section as shown in FIG. 4D can also be excavated by swing control of the outer spokes 2e. Also, in order to obtain a free-section tunnel with high accuracy,
A control program is created in advance so that each outer spoke 2e swings according to the cross-sectional shape, and each swing motor 5 is controlled by this control program. The earth and sand excavated by the cutter head 2 as described above is taken into the bulkhead 10 from between the spokes 2a and 2e, and then carried out of the bulkhead 10 by an earth removal device (not shown). Transported to the rear of

[0012]

According to the invention, as described in detail above, the spokes provided on the front surface of the cutter head are formed from the inner spokes and the outer spokes, and the outer spokes are optionally formed with respect to the inner spokes by a swing motor. By swinging the outer spokes according to the cross-sectional shape of the tunnel to be excavated during excavation, a tunnel having a free cross-sectional shape can be excavated. In addition, the spokes are divided into inner spokes and outer spokes, and the outer spokes can be freely swung by a swing motor, so the bulkhead can be wider than the conventional complicated cutter head. As a result, the excavation speed can be increased because there is little restriction on the sediment intake, and the sediment is not blocked in the bulkhead, so that the sediment can be smoothly carried out. In addition, since both left and right rotations are possible, the degree of freedom is improved, for example, the rotation direction can be selected according to the excavation situation.

[Brief description of the drawings]

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

FIG. 2 is a perspective view of a cutter head provided in the shield machine according to one embodiment of the present invention.

FIG. 3 is a diagram illustrating the operation of the shield machine according to one embodiment of the present invention.

FIG. 4 (a) is an operation explanatory view of the shield machine according to one embodiment of the present invention. (B) It is operation explanatory drawing of the shield machine which becomes one Example of this invention. (C) It is operation explanatory drawing of the shield machine which becomes one Example of this invention. (D) It is operation explanatory drawing of the shield machine which becomes one Example of this invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shield main body 2 Cutter head 2a Inner spoke 2e Outer spoke 5 Swing motor

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) E21D 9/08

Claims (1)

(57) [Scope of request for utility model registration] 1. A shield excavator that excavates by rotating a cutter head 2 provided at a front part of a shield main body 1. In a shield excavator, a plurality of spokes provided in a front part of the cutter head 2 in a radial direction are used as inner spokes. 2a and an outer spoke 2e provided at the outer end of the inner spoke 2a so as to be swingable, and each outer spoke 2e is made swingable by a swing motor 5 provided for each outer spoke 2e. Become a shield machine.