JPH03257289A - Shield excavator - Google Patents

Abstract

PURPOSE:To enable the compactness of an excavator by partitioning a work room by a front bulkhead and a rear supporting part in a shield cylinder, as well as securing a driving shaft for a face cutter fittingly between the front bulkhead and rear supporting part in such a way as to be inclined upward by a specified angle in relation to the axis of the shield cylinder. CONSTITUTION:In the shield cylinder 2, provided with a face cutter 3, of a shield excavator 1, a work room is partitioned by a front bulkhead 6 and a rear supporting member 7, and a cutting blade 9 is formed in the front. The front bulkhead 6 and rear supporting part 7 are then fixedly pierced with a boss member 11 inclined upward by theta deg. to the axis 10 of the shield front drum 2, and a driving shaft 12 for rotating the face cutter 3 is rotatably inserted into the boss member 11. The lower space of a drive unit 16 is thereby enlarged, and even if the excavator is made compact, a conveyor device such as an existing screw conveyor can be installed with sufficient inclination.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a shield tunneling machine.

C. Prior Art] Conventionally, there is a shield excavator in which a working chamber is partitioned by two partition walls at the front of a shield tube so that ground improvement work such as chemical injection or freezing method can be easily carried out.

FIG. 2 shows an example of the above-mentioned shield tunneling machine. This type of shield tunneling machine a has a front bulkhead C at the front of the shield tube.
and a rear partition wall d, and a center shaft 9 extending along the axis r of the shield tube is provided with a cylindrical boss member between the front partition wall C and the rear partition wall d. The center shaft 9 is rotatably supported by a driving device i installed on the rear surface of the rear bulkhead d to rotate the face cutter j provided in the front part of the shield excavator a. .

Further, at a lower position of the center shaft Q, the front part thereof is connected to the lower part of the front bulkhead C, and the rear part thereof is inclined so as to gradually rise upward in the rearward direction and extends to the rear of the shield tunneling machine a. A screw conveyor k is installed, and the soil excavated by the face cutter j is carried into the shield excavator a by the screw conveyor, and the soil discharged from the rear screw gate l is further transferred to the screw conveyor. The material is conveyed rearward by a belt conveyor placed at a lower position at the rear of the screw conveyor.

[Problems to be Solved by the Invention] However, in the above conventional structure, as the shield tunneling machine a becomes smaller (smaller in diameter), the space X below the drive device i becomes narrower, and the screw conveyor k is t
It will be necessary to install it at a gentle slope so as not to interfere with it.

However, if the slope of the screw conveyor is made too gentle, the existing screw conveyor will not have enough space to place a conveying device such as a belt conveyor at a position below the screw gate 1.

For this reason, it is conceivable to extend the rear part of the screw conveyor to a position below which there is a space where a conveyance device such as the belt conveyor can be placed. There is a risk that new problems will arise, such as interference and the narrowing of underground working space.

In addition, as shown in Fig. 3, two screw conveyors are installed to avoid interference with the drive device i.

It is also possible to connect the soil by bending it, but this would complicate the structure, require two drive sources, and prevent the smooth flow of soil from being carried out by a screw conveyor.

There is a risk that problems such as interference at the connection part of the ko may occur.

The present invention was developed in view of the above-mentioned circumstances, and an object of the present invention is to provide a shield tunneling machine that can use an existing screw conveyor without modification even if the shield tunneling machine is downsized (reduced in diameter).

[Means for Solving the Problems] The present invention has a working chamber partitioned by a front partition wall and a rear support portion at the front portion of a shield cylinder equipped with a face cutter on the front surface, and the front partition wall and the rear support portion In a shield excavator in which a driving device for rotating a face cutter, which is rotatably supported through the shield cylinder, is installed on the rear surface of the rear support part, the center of rotation of the face cutter is located approximately on the axis of the shield cylinder. The drive shaft is provided at an angle so that the drive device is positioned above the axis of the shield cylinder.

[Function] Therefore, in the present invention, by providing the drive shaft at an angle, the installation position of the drive device that drives the drive shaft with respect to the rear support portion can be shifted upward, and therefore, the space below the drive device can be shifted upward. Since the screw conveyor can be expanded through the lower space, it is possible to install the screw conveyor at a slope sufficient to form a space in which a conveying device such as a belt conveyor can be arranged at a lower position behind the screw conveyor.

[Example] Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention, where l is a shield excavator, 2 is a shield cylinder equipped with a face cutter 3 on the front (hereinafter referred to as a shield front body in this embodiment), and 4 is a shield front body. 2 shows a rear shield body connected via a bending jack 5, and the front part of the shield front body 2 includes a front bulkhead 6 and a rear support part 7 (hereinafter referred to as rear bulkhead 7 in this embodiment). ), a working chamber 8 for carrying out soil improvement work is partitioned, and a face chamber 9 is formed in the front part of the front partition wall 6.

A cylindrical boss member 11 is penetrated and fixed to the front partition wall 6 and the rear partition wall 7, and the boss member 11 is inclined at a required angle θ so that the rear part thereof is located above the axis lO of the front shield body 2. A center shaft 12, which is a drive shaft for rotating the face cutter three times, is rotatably fitted into the member 11.

Here, a face cutter 3 is provided at the front part of the center shaft I2 so as to have a rotating surface perpendicular to the axis i3 of the center shaft 12.
The center of rotation 15 of the shield front body 2 is positioned approximately on the axis IO of the shield front body 2. In addition, 14 in the figure indicates a bit provided on the front surface of the face cutter 3.

Further, a drive device 1B is connected to the rear part of the center shaft 12, which is installed on the rear surface of the rear partition wall 7 in accordance with the rear position.

This drive device 16 includes a support frame 17 fixed to the rear surface of the rear bulkhead 7, a drive motor 18 attached to the support frame 17 that can rotate in forward and reverse directions, and a drive motor 18 that transfers the rotational force of the drive motor 18 to the face cutter 3. and a reduction gear mechanism 19 that transmits information to the

Further, at the lower position of the center shaft 12, there is a space below the drive device 16 whose front end is connected to the lower part of the front bulkhead 6, passes through the working chamber 8 and the rear bulkhead 7, and is expanded by the above-mentioned inclination of the center shaft 12. A screw conveyor 20 is installed which passes through the X and extends rearward.

In the figure, 21 is a propulsion shield jack provided on the inner circumference of the front end of the shield rear body 4 behind the rear bulkhead 7, 22 is a segment, 23 is a belt conveyor, 24 is a screw gate, and 25 is a screw gate 24. A screw gate jack opens and closes, 26 is a screw drive motor, 27 is a chemical injection tube, 28 is a folded seal, and 29 is a tail seal.

According to the above structure, by providing the center shaft 12 in an inclined manner, the installation position of the drive device 16 connected to the rear part of the center shaft 12 with respect to the rear partition wall 7 can be shifted upward, so that the drive Since the lower space X of the device 16 can be expanded, the screw conveyor 2
o can be installed at a sufficient inclination to form a space in which a conveying device such as the belt conveyor 23 can be arranged at a position below the rear thereof.

Therefore, in the present invention, even if the shield tunneling machine 1 is downsized (reduced in diameter), the screw conveyor 2° can be extended or the screw conveyor 2 can be
The existing screw conveyor 20 can be installed without bending or connecting the original screw conveyor, and the screw conveyor 20 can be easily installed when changing direction etc.
It is possible to avoid problems such as interference between the mine and peripheral equipment in the mine and narrowing of the working space in the mine, as well as problems such as complicating the structure, increasing the number of drive sources, and impeding the smooth flow of excreted soil.

Incidentally, in the above-mentioned embodiment, a shield excavator of a so-called center shaft support type in which the face cutter 3 is supported by the center shaft 12 itself, which is a drive shaft for rotating the face cutter 3, has been described. It is also possible to adopt various methods such as an intermediate beam support method.

Further, the shield excavator of the present invention is not limited to the above-described embodiment, and the rear support portion may be a center shaft support structure using a support beam or the like in addition to the rear bulkhead. It goes without saying that the present invention can be applied to a single-stage shield excavator without a rear body, and that various changes can be made without departing from the gist of the invention.

[Effects of the Invention] As explained above, according to the shield tunneling machine of the present invention, even if the shield tunneling machine is downsized (reduced in diameter), it is possible to extend the screw conveyor or bend the two screw conveyors. An excellent effect can be achieved in that an existing screw conveyor can be installed through the space below the drive device, which is expanded by the inclination of the drive shaft, without having to make any connections.

[Brief explanation of drawings]

Fig. 1 is a sectional view of an embodiment of the present invention, Fig. 2 is a sectional view of an example of a shield excavator in which a working chamber is partitioned at the front of a shield tube, and Fig. 3 is a sectional view of a conventional example. It is. In the figure, l is the shield tunneling machine, 2 is the shield front shell (shield tube), 3 is the face cutter, 6 is the front bulkhead, and 7 is the rear bulkhead (
8 is the working chamber, 10 is the axis of the shield front shell (shield cylinder), 12 is the center shaft (drive shaft), 1
5 is the rotation center of the face cutter, and 16 is a drive device.

Claims (1)

[Claims] 1) A face that has a working chamber defined by a front bulkhead and a rear support part at the front of a shield cylinder equipped with a face cutter on the front surface, and is supported rotatably through the front bulkhead and rear support part. In a shield excavator in which a drive device for a drive shaft for rotating the cutter is installed on the rear surface of the rear support part, the drive device is aligned with the axis of the shield tube while the rotation center of the face cutter is positioned approximately on the axis of the shield tube. A shield excavator characterized in that the drive shaft is provided at an angle so as to be positioned upwardly.