JP2902145B2 - Shield excavator - 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 excavator for constructing a tunnel having a special section other than a circular shape.

[0002]

2. Description of the Related Art Recently, a shield excavator for constructing a tunnel having a special section other than a circular shape has been developed.

[0003]

A cutter for excavating a special section other than a circular one is extremely difficult to mechanically manufacture. Further, even if this cutter can be manufactured, there is a problem that the reliability becomes low because the structure becomes extremely complicated. The present invention has been proposed in view of the above-mentioned problems, and the object thereof is to construct a tunnel having a special cross section other than a circular shape even when excavating with a circular excavation cutter, and to require a complicated structural cutter. Instead, the present invention aims to provide a shield excavator that can maintain reliability.

[0004]

SUMMARY OF THE INVENTION In order to achieve the above object, a shield excavator according to the present invention has a deformed shape other than a circular shape.
Excavator body tail incorporating cross-section segments
Through the ring gutter section and chamber chamber in front of the section
A circle whose excavation section is a circle that is substantially circumscribed on the outer surface of the tail section.
A drilling cutter is installed at the tail part or in the vicinity.
An earth pressure gauge is installed and a part of the excavated soil is
The chamber from the chamber to the ring gar around the tail
Excavation to the space corresponding to the difference in shape between the evening part and the tail part
A screw conveyor that pushes against the earth pressure applied to the machine body
A.

[0005] The shield excavator of the present invention further comprises a ring gutter section and a chamber chamber on the outer surface of the tail section in front of the tail section of the excavator body into which a segment having a deformed cross section other than a circle is incorporated. A circular drilling cutter with a circumscribed circle as the drilling cross section is provided. In the ring gutter part, the excavated soil after separation of the muddy water discharged from the groundwater or muddy water treatment plant is installed from the chamber chamber. An excavated soil injection system with a valve is provided which is pushed into a space corresponding to the shape difference between the ring girder portion and the tail portion around the tail portion.

[0006]

The shield excavator of the present invention is constructed as described above, and performs the following operations. (1) When the excavated soil does not contain muddy water, the excavated soil excavated by the circular excavator is discharged to the rear of the excavator main body through the chamber chamber → an earth removal device in the excavator main body, while the chamber chamber is excavated. A part of the excavated soil is pushed into the space around the tail (space corresponding to the shape difference between the ring gutter and the tail) through each screw conveyor, against the earth pressure acting on the body of the excavator. , Form a tunnel cross section that matches the tail of the special shape. (2) when containing the mud in excavated soil, sends excavated soil was excavated by circular excavation Katsuta to the processing plant soil removing device → excavator outside the body of Chiyanba chamber → excavator body, where mud and drilling soil And the excavated soil from which mud water has been separated is pumped into the pump → excavated soil injection system with a valve → into the space against the earth pressure acting on the body of the excavator to form a tunnel section that matches the tail of the special shape. Form.

[0007]

1 to 6 show a shield excavator according to the present invention.
In FIG. 1, reference numeral 1 denotes a circular excavating cutter, and the excavating section of the cutter 1 is a circle substantially circumscribing an outer surface of a tail portion 3 to be described later. Numeral 2 denotes a circular ring gutter having the same diameter as the circular excavator 1 provided behind the circular excavator 1 via a chamber chamber (face chamber) C, and 3 in FIGS. Tail part,
8 shows a specially shaped segment, and FIG. 3 shows the shape of a rectangular tail 3 for assembling the segment 8 into a rectangle.
5 shows the shape of the horseshoe-shaped tail portion 3 for assembling the segment 8 in a horseshoe shape, and FIG. 5 shows the shape of the elliptical tail portion 3 for assembling the segment 8 in an elliptical shape.

In FIG. 2, reference numeral 3 'denotes an outer skin plate provided outside the tail portion 3, and the outer skin plate 3'
It is provided when it is necessary to prevent the collapse of earth and sand around the tail. In FIG. 1, reference numeral 4 denotes a tail packing, and reference numeral 5 denotes a plurality of shield jacks. Each of the shield jacks 5 is disposed in the excavator main body so as to press a front end of a segment 8 described later.

Reference numeral 6 denotes a valve of an excavated soil injection system provided in the excavator body, and 7 denotes a plurality of screw conveyors for pushing a part of the excavated soil from the chamber C into the space B described later. 7 is provided in the ring gutter section 2. 3 to 5, reference numeral 10 denotes an end plate that closes the space between the ring girder portion 2 and the tail portion 3, and reference numeral 9 denotes an earth pressure gauge provided on the end plate 10 and the tail portion 3 (or the outer skin plate 3 '). , B is the ring gutter 2 around the tail 3
This is a space portion corresponding to a shape difference between the tail portion 3 and the tail portion 3.

[0010] Since the smaller the space portion B is, the more stable the method is, the ring girder portion 2 is made smaller in circle than the tail portion 3 as shown in FIG. Next, the operation of the shield excavator will be specifically described. (1) When the excavated soil does not contain muddy water, the excavated soil excavated by the circular excavator 1 is passed through the chamber chamber C → the earth removal device (not shown) provided in the excavator body, and is located behind the excavator body. While excavating the part of the excavated soil in the chamber C into the space B corresponding to the shape difference between the ring garter 2 and the tail 3 around the tail 3 via each screw conveyor 7. And presses against the earth pressure acting on the tail section 3 to form a tunnel section suitable for the tail section 3 having a special shape.

At this time, if the pressure control by the earth pressure gauge 9 alone is not sufficient, the speed and stroke of the shield jack 5 are measured, and the result is multiplied by the area of the space B to obtain a necessary absolute earth volume. And the soil volume per minute. Then, the amount of excavated soil to be supplied from the screw conveyor 7 to the space B is obtained by a flow meter (not shown) provided at the rear end of the screw conveyor 7 or a rotation speed detector of the screw conveyor 7 and the ratio between these is determined. Manage with. (2) When the excavated soil contains muddy water, a circular excavation cutter 1
The excavated soil excavated by the above is sent to the chamber chamber C → an earth removal device (not shown) provided in the excavator body → a processing plant (a processing plant for excavated soil and muddy water) outside the excavator main body, where muddy water is removed. The excavated soil is separated from the excavated soil, and the excavated soil separated from the muddy water is pumped by a pump (not shown) → the excavated soil injection system with the valve 6 → the space B (the ring gutter portion 2 and the tail portion 3 around the tail portion 3).
Into the space B) corresponding to the difference in shape between the excavator body and the earth pressure acting on the body of the excavator, thereby forming a tunnel section suitable for the tail portion 3 having a special shape.

[0012]

According to the shield excavator of the present invention, when muddy water is not mixed with the excavated soil as described above, the excavated soil excavated by the circular excavator is passed through the chamber chamber to the earth removal device in the excavator body. While discharging to the rear of the excavator body, part of the excavated soil in the chamber chamber is excavated into the space around the tail (space corresponding to the shape difference between the ring gutter and the tail) through each screw conveyor. The tunnel is pressed against the earth pressure applied to the machine body to form a tunnel section that matches the tail of the special shape. In the case that contains the mud in the excavated soil, sends excavated soil was excavated by circular drilling cutter to earth discharging device → excavator body outside the treatment plant Chiyanba chamber → excavator body, and wherein the mud and drilling soil The excavated soil separated and separated from the muddy water is pumped into the pump → excavated soil injection system with a valve → into the space against the earth pressure applied to the excavator body, forming a tunnel cross section that matches the tail of the special shape. Even when excavating with a circular excavator, a tunnel with a special cross section other than a circular one can be constructed, and the reliability can be maintained without the need for a complicated structural cutter.

[Brief description of the drawings]

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

FIG. 2 is a longitudinal sectional side view showing another embodiment in which a tail portion is changed.

FIG. 3 is a vertical sectional rear view showing one embodiment of a tail portion taken along line AA of FIG. 1;

FIG. 4 is a longitudinal rear view showing another embodiment of the tail portion along the line AA in FIG. 1;

FIG. 5 is a longitudinal rear view showing another embodiment of the tail portion along the line AA in FIG. 1;

FIG. 6 is a longitudinal rear view showing still another embodiment of the tail portion.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Circular excavation cutter 2 Ring girder part 3 Tail part 6 Valve of excavated soil injection system 7 Screw conveyor 8 Segment B Space part

Claims (2)

(57) [Claims] 1. A segment having a deformed cross section other than a circle
In front of the tail of the excavator body to be incorporated, a ring
Outer surface of the tail section through the gutter section and the chamber chamber
A circular excavator with a circular section circumscribing the
Attach an earth pressure gauge at or near the tail
A part of the excavated soil was removed from the above-mentioned chamber
Ring gar evening and tail around the tail from the room
Apply the excavator body to the space corresponding to the shape difference of
That there is a screw conveyor that pushes in against the earth pressure.
Characterized shield excavator. 2. A segment having a deformed cross section other than a circle
In front of the tail of the excavator body to be incorporated, a ring
Outer surface of the tail section through the gutter section and the chamber chamber
A circular excavator with a circular section circumscribing the
In the same area of the Ringger, the excavation on the ground or in the pit
After separation of muddy water discharged from a shaving and muddy water treatment plant
Remove the excavated soil from the chamber chamber to the area around the tail.
The space corresponding to the shape difference between the Ngurga evening and the tail
With a valve-injected excavated soil injection system
Shield excavator.