JPH0711890A - Shielding machine - Google Patents

Abstract

PURPOSE:To reduce the quantity of excavated soil and sand carried to the outside of a pit by double constituting a shielding machine of each skin plate on the inside and the outside, forming a transfer path for excavated soil and sand between both skin plates and arranging a screw conveyor in the path. CONSTITUTION:A cone-shaped section 11, a diameter of which is reduced forward, is formed to an internal skin plate 10, and a screw conveyor 12 for taking-in to a shielding machine is installed onto an axis. A transfer path P is formed toward a backward section by both skin plates 10, 13 at that time, and a plurality of screw conveyors 14 are mounted in the path P. Shield jacks 4 are elongated, both skin plates 10, 13 are pushed and propelled, and a part of excavated soil and sand is taken into the shielding machine by the screw conveyor 12. The greater part of soil and sand are transferred by the screw conveyors 14 pushing soil and sand into the transfer path P in the direction of the arrow B at that time. When soil and sand pass in the path P, the density of soil and sand is increased and sections among existing segments S and a bedrock G are filled with soil and sand, and a high density layer D is formed and the quantity of soil and sand carried to the outside of a pit is reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a so-called blind type shield which takes in the earth and sand excavated from the opening formed in the front surface of the skin plate into the machine by extruding the machine body without the cutter disk used in the shield construction method. Regarding the machine.

[0002]

2. Description of the Related Art First, a conventional blind type shield machine will be described.

In FIGS. 5 and 6, a rectangular opening 3 is formed in a front plate 2 of a cylindrical skin plate 1, and a shield jack 4 provided in the skin plate 1 is formed.
Of the existing segment S is extended by taking a reaction force, and the skin plate 1 is pushed out to excavate the natural ground G, and the excavated earth and sand is taken into the aircraft through the opening 3 as shown by an arrow A, and is carried out to the outside of the mine. And then processing.

[0004]

The shield machine described above has a problem that it takes a lot of time and money to carry out the earth and sand to the outside of the mine and to convey 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, there is provided a shield machine for taking in the earth and sand excavated from the opening formed in the front surface of the skin plate into the machine by extruding the machine body without the cutter disk. The skin plate is dually configured with an inner skin plate having a cone-shaped portion for reducing the diameter forward and an outer skin plate on the outer side of the inner skin plate, and a transfer path for excavated earth and sand is formed between these skin plates. In addition to being formed, a transfer means is provided in the transfer passage.

It is preferable that the transfer means is constituted by a screw conveyor or a ribbon screw.

[0008]

In the shield machine constructed as described above, most of the earth and sand excavated by advancing the skin plate are
It is pushed into the transfer passage, transferred to the screw conveyor, densified while passing through the passage, and filled between the ground and the existing segment. Therefore, the carry-out amount to the outside of the mine is reduced.

[0009]

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

1 and 2, the inner skin plate 10 is formed with a cone-shaped portion 11 whose diameter is reduced forward, and a screw conveyor 12 for taking in the machine is provided on the axis of the cone-shaped portion 11. However, the screw conveyor 12 is not essential and may be omitted.

On the outside of the inner skin plate 10,
An outer skin plate 13 is provided. The outer diameter of the outer skin plate 13 is formed to be substantially equal to the outer diameter of the high-density layer D, which will be described later, and the skin plates 10 and 13 form a transfer passage P whose cross-sectional area decreases toward the rear. The cross-sectional area of the rear end of the transfer passage P is smaller than the cross-sectional area of the front end of the transfer passage P. A plurality of transfer means (four in the illustrated example) are provided in the transfer passage P.
The screw conveyor 14 is provided.

Next, the operation will be described.

When the shield jack 4 is extended and both skin plates 10 and 13 are pushed forward for excavation, a part of the excavated earth and sand is taken into the machine by the screw conveyor 12. Then, most of the earth and sand is guided by the cone-shaped portion 11 and is transferred by the screw conveyor 14 that is pushed into the transfer path P as shown by an arrow B. Since the cross-sectional area of the rear end of the passage P, that is, the outlet portion is sufficiently smaller than the cross-sectional area of the front end of the passage P, that is, the inlet portion, the sediment is densified while passing through the transfer passage P, and then the existing segment S It is filled with the natural ground G to form a high-density layer D.

3 and 4 show another embodiment of the present invention in which the rear edge of the inner skin plate 10 and the rear edge of the outer skin plate 20 are connected by a rear face plate 22, and the front edge of the outer skin plate 20 is connected. And the front edge of the cylinder portion of the screw conveyor 12 are connected by a concave front plate 21, and between the front plate 21 and the rear plate 22, a surface including an axis forms a cone surface that reduces in diameter forward. In this example, a plurality of (eight in the illustrated example) transfer passages P1 formed of pipes are provided, and a screw conveyor 23 is provided in the transfer passages P1. Therefore, the inner surface in the radial direction of the transfer passage P1 substantially forms a cone-shaped portion. In this embodiment, part of the excavated earth and sand is guided by the concave front plate 21 and pushed into the transfer passage P1 as indicated by an arrow B, and is transferred by the screw conveyor 23. Then, after being densified while passing through the passage P1, it is filled between the existing segment S and the ground G,
The high density layer D is formed.

[0015]

EFFECTS OF THE INVENTION Since the present invention is constructed as described above, most of excavated earth and sand is densified and filled between the ground and the segment to reduce the amount of material carried out to the outside of the mine. can do.

[Brief description of drawings]

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

FIG. 2 is a front view of FIG.

FIG. 3 is a side sectional view showing another embodiment of the present invention.

FIG. 4 is a front view of FIG.

FIG. 5 is a side sectional view showing a conventional blind type shield machine.

6 is a front view of FIG.

[Explanation of symbols]

 D: High density layer G: Ground P, P1 ... Transfer passage S ... Segment 1 ... Skin plate 2 ... Front plate 3 ... Opening 4 ... Shield jack 10 ... Inner skin plate 11 ... Cone-shaped part 12 ... Screw conveyor 13, 20 ... Outer skin plate 14, 23 ... Screw conveyor 21 ... Front plate 22 ... Rear plate

Claims (1)

[Claims] 1. A shield machine for taking in earth and sand excavated from an opening formed in a front surface of a skin plate into the machine by extruding the machine body without a cutter disk, and a cone-like shape for reducing the diameter of the skin plate forward. The inner skin plate having a portion formed therein and the outer skin plate outside the inner skin plate are doubled to form a transfer path for excavated earth and sand between these skin plates, and transfer means is provided in the transfer path. A shield machine characterized by the provision of.