JPH0711883A - Shielding machine - Google Patents

Abstract

PURPOSE:To reduce the quantity of excavated soil and sand carried to the outside of a pit by forming the double structure of an external skin plate approximately equal to the outside diameter of a cutter disc and an internal skin plate on the inside of the external skin plate. CONSTITUTION:The front end section of an internal skin plate 10 is formed in a diameter reducing section 11 having a trapezoidal sectional shape, and a screw conveyor 4 upward inclined to an internal section is installed to a lower section. A shield jack 5 is elongated at that time, a cutter disc 2 is rotated and propelled, and a part of excavated soil and sand is taken into a pit by the screw conveyor 4. Partial soil and sand are pushed into a clearance C from the direction of the arrow B by the guide of the diameter reducing section 11 at that time, and density is increased during a time when soil and sand pass in the clearance C. A section between an existing segment S and a bedrock G is filled with soil and sand, thus forming a high density layer D. Soil and sand are carried to the outside of the pit only in quantity by the screw conveyor 4.

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 in a shield construction method.

[0002]

2. Description of the Related Art First, a conventional shield machine having a cutter disk will be described.

In FIG. 8, a cylindrical skin plate 1
A cutter disk 2 is provided on the front side of and rotates to excavate the natural ground G. The excavated earth and sand are compacted in the chamber 3 and discharged by the screw conveyor 4 into the mine as indicated by arrow A. Further, the skin plate 1 is equipped with a shield jack 5, and the existing segment S is used as a reaction force receiver to push the entire shield machine forward. And
After excavating enough to assemble the segment S of one ring, the pipe is constructed by a series of steps of assembling the segment S. Then, the earth and sand taken into the mine is carried out and processed.

[0004]

The conventional shield machine has a problem that it takes a lot of time and money to carry the earth and sand out of the mine and to transfer it to the earth dumping site.

An object of the present invention is to provide a shield machine that reduces the amount of excavated earth and sand carried out of the mine.

[0006]

According to the present invention, a skin plate of a shield machine equipped with a cutter disk is provided with an outer skin plate substantially equal to the outer diameter of the cutter disk and an inner skin plate inside the outer skin plate. It is composed of two layers.

The front end of the inner skin plate is formed in a shape in which earth and sand are easily pushed in (for example, trapezoidal cross section), and the area between the inner and outer skin plates is formed sufficiently smaller than the cutter disk area. preferable.

Further, it is preferable to provide a screw conveyor for taking in the earth and sand into the machine, but it is not essential and it can be taken in through the opening.

Further, the inner and outer skin plates are radially defined, and each section is provided with a valve which can be operated from the inside of the machine, and the direction of the shield machine can be controlled by adjusting the opening of the valve.

The outer skin plate is preferably supported on the inner skin plate by supporting members such as rib-shaped spokes or pipes.

[0011]

[Operation] In the shield machine configured as described above,
The excavated earth and sand are pushed into the gap between the inner and outer skin plates by the forward movement of the shield machine, densified while passing through the gap, and then filled between the ground and the existing segment. Therefore, the carry-out amount to the outside of the mine is reduced.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. In addition, in FIG. 1, portions corresponding to those in FIG. 8 are denoted by the same reference numerals, and redundant description will be omitted.

In FIG. 1, the front end of the inner skin plate 10 is formed as a reduced diameter portion 11 having a trapezoidal cross section.
A screw conveyor 4 tilting inward is provided below the reduced diameter portion 11, and a cutter disk 2 is provided on the front side. A shield jack 5 is provided at the rear of the inner skin plate 10.

An outer skin plate 12 is provided with a gap C provided in the inner skin plate 10. The outer diameter of the outer skin plate 12 is formed to be substantially the same as the outer diameter of the cutter disk 2, and as shown in FIGS. 2 and 3, a plurality of (eight in the illustrated example) rib-shaped spokes 13 are provided to the inner side. It is supported by the skin plate 10. The area of the gap C is formed sufficiently smaller than that of the cutter disk 2.

Next, the operation will be described.

When the shield jack 5 is extended and the cutter disc 2 is rotated to advance, part of the excavated earth and sand is
It is taken into the mine by the screw conveyor 4. Then, a part of the earth and sand is guided by the reduced diameter portion 11 and is indicated by an arrow B.
As shown in FIG. Since the area of the gap C is sufficiently smaller than the area of the cutter disk 2, the earth and sand are densified while passing through the gap C and then filled between the existing segment S and the ground G to form a high density layer. D is formed. Therefore, the amount of earth and sand transported to the outside of the mine is only the amount by the screw conveyor 4, so that it is reduced compared to the conventional case.

FIG. 5 shows another embodiment of the present invention, in which a clearance C between the inner skin plate 10 and the outer skin plate 12 is shown.
A valve 14 that can be operated from inside the machine.
This is an example in which the direction of the shield machine is controlled by adjusting the opening degree and changing the amount of sediment passing through.

FIGS. 6 and 7 show another embodiment of the supporting means for the outer skin plate 12, in which the front and rear annular support plates 15, 15 are provided in the gap C, and a plurality of ( In the illustrated example, eight round pipes 16 are provided. The round pipe 16 can be replaced with a square pipe or the like.

[0019]

Since the present invention is configured as described above, a portion of excavated earth and sand is densified and filled between the ground and the segment to reduce the amount of carry-out to the outside of the mine. be able to.

[Brief description of drawings]

FIG. 1 is a side sectional view showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

3 is a cross-sectional view taken along the line BB of FIG.

4 is a drawing showing another embodiment of the spoke of FIG.

FIG. 5 is a front view showing a main part of another embodiment of the present invention.

FIG. 6 is a front view showing another embodiment of the support member.

7 is a sectional view taken along the line CC of FIG.

FIG. 8 is a side sectional view showing a shield machine equipped with a conventional cutter disk.

[Explanation of symbols]

 C Gap D High Density Layer G Ground S Segment 1 Skin Plate 2 Cutter Disc 3 Chamber 4 Screw Conveyor 5 Shield Jack 10 Inner Skin Plate 11 Reduced Diameter Part 12 Outer Skin Plate 13, 13a Rib Spoke 14 Valve 15 Annular Support Plate 16 Round pipe

Claims (1)

[Claims] 1. A skin plate of a shield machine equipped with a cutter disk is configured in a double structure with an outer skin plate substantially equal to the outer diameter of the cutter disk and an inner skin plate inside the outer skin plate. And shield machine.