JPH01287397A - Shield excavator - Google Patents

Abstract

PURPOSE:To effectively prevent the inflow of underground water from being generated from a tail seal section by setting an expanding membrane having flexibility telescopically in the shape of a ring, inside a press ring. CONSTITUTION:A shield excavator has a cylindrically formed housing 2, and on its front surface, a cutter is rotatably supported. Inside the housing 2, a cylindrically formed press ring 7 is slidably set in the axial direction of the housing 2 in the shape of coming in contact with the internal surface of the housing 2. In the shape of surrounding the inner periphery of the press ring 7, a fluid chamber 7b is formed, and the fluid chamber 7b is provided with the expanding membrane 7c of a material having flexibility such as rubber or the like in the shape of ring to cover the fluid chamber 7b through the external section. Into the fluid chamber 7b, compressed air is fed, and the expanding membrane 7c is expanded and pushed against concrete 21; accordingly, the inflow of underground water is prevented from being generated from the side of natural ground 19.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial Application Field The present invention is applicable to cast-in-place concrete mortar (in this specification, "concrete mortar" means "concrete" or "mortar"). This relates to a shield excavator that excavates while constructing a lining.

(b), Conventional technology Recently, in Japanese Patent Application Laid-Open No. 62-194399, etc., it has been proposed that the lining of a tunnel excavated by a shield excavator can be constructed with cast-in-place concrete and mortar, regardless of the segment. A proposal has been made for a machine.

(C) 0 Problems to be Solved by the Invention However, in the case of such a shield 1 bending machine, when the groundwater level in the excavated ground is high, groundwater flows into the shield 1 bending machine from the tail seal part, and the proper There is a risk that the construction of the lining will not be possible.

SUMMARY OF THE INVENTION In order to eliminate the above-mentioned drawbacks, the present invention aims to provide a shield excavator that can effectively prevent the inflow of groundwater from the tail seal portion.

(d) Means for solving the zero problem, that is, the present invention is constructed by providing a flexible expansion membrane (7C) inside the press ring (7) in an annular shape that can be expanded and contracted.

Note that the numbers in parentheses are for convenience and indicate corresponding elements in the drawings, and therefore, this description is not limited to the descriptions in the drawings. The following r (el
The same applies to the column ``, action''.

(e) 0 Effect With the above-described configuration, the present invention acts to block the water supply by expanding the expansion membrane (7C).

(f), Example Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a sectional view showing an embodiment of a shield l excavator according to the present invention, and FIG. 2 is an enlarged view of a press ring portion.

As shown in FIG. 1, the shield excavator 1 has an outer shell 2 formed in a cylindrical shape.
A cutter 3 is rotatably supported on the left side of the figure. The cutter 3 is driven by a drive motor 5 provided at a gap g2a of the outer shell 2, which is provided to block the space inside the outer shell 2 in the left-right direction.
Furthermore, a urethral jack 6 is connected to the partition wall 2a.
A plurality of heads are arranged in a ring along the outer shell 2. [The urethral jack 6 is provided with a ram 6a that can protrude and retract in the direction of arrow A1B, and furthermore, a cylindrical press ring 7 is provided inside the outer shell 2 and is in contact with the inner surface of the outer shell 2.] The press ring 7 is provided so as to be slidable in the directions of arrows A and B, that is, in the axial direction of the outer shell 2.The press ring 7 is provided with press ring jacks 9 at predetermined intervals. A plurality of press rings 7 are arranged.
A plurality of concrete discharge pipes (not shown) are provided with the discharge ports at their tips facing the side surface 7a of the press ring 7, that is, toward the rear of the shield jumping machine 1. Inside the vicinity, as shown in FIG. 2, a fluid chamber 7b is formed to annularly surround the inner periphery of the press ring 7, and a flexible material such as rubber is attached to the fluid chamber 7b. An expansion film 7C made of a material is provided in an annular shape to cover the fluid chamber 7b from the outside. One end of the fluid supply pipe 7d is connected to the fluid chamber 7b, and the other end of the fluid supply pipe 7d is connected to the fluid chamber 7b. A compressed air supply means such as an air pump is connected.

By the way, a gauge ring 11 formed in an annular shape is attached to the tip of the ram 6a of the old road jack 6.
The gauge ring 11 has an engagement groove 11a.
1 is perforated in an annular shape over the entire circumference. In addition, the gauge ring 11 has a formwork 13 assembled in an annular shape.
They are connected in the left and right direction in Figure 1.

Since the shield excavator 1 has the above configuration,
When excavating the tunnel 15, the cutter 3 is rotated by the drive motor 5, and the ram 6 of the intermediate jack 6 is rotated.
a to protrude in the direction B in FIG.
The cutter 3 is pressed in the direction of the face 16, that is, in the direction indicated by the arrow. Then, due to the pressing force, cutter 3 and face 1
6 are in contact with each other under a predetermined contact pressure, and the face 16 is excavated by the cutter 3. At the same time, the outer shell 2 is propelled in the entry direction, and the tunnel 15 is moved to the rear of the shield 1 excavator 1, that is, to the right in FIG. It is being formed.

In this way, as the tunnel 15 is formed, ta
In order to prevent the excavated ground 19 from collapsing, it is necessary to construct a lining 20, but the construction of this lining 20 is described in
This can be done using a known method such as that shown in No. 2-194399. Therefore, detailed explanation of the construction procedure of the lining will be omitted here, but when constructing the lining 20 with cast-in-place concrete 21, the boundary between the earth and the outer shell 2 to be propelled, that is, the tail seal. There is a risk that groundwater will flow into the shield cut @1 from part 2b.

So 1. Concrete 21 in concrete pouring space 2
After the concrete 21 is poured, compressed air is supplied into the fluid chamber 7b through the fluid supply pipe 7d until the concrete 21 solidifies. Then, due to the action of the compressed air supplied into the fluid chamber 7b, the flexible expansion membrane 7C spreads over the slightly solidified concrete 21 in the concrete placement space 6, as shown by the dotted line in FIG. When pressed, it bulges out into the press ring 7 in an annular shape. Then, the underground water on the side of the ground 19 passes through the inside of the press ring 7 and reaches the inside of the shield excavator 1.
c and the membrane 7c is forcibly closed by the concrete 21, and the inflow of groundwater from the ground 19 side is effectively prevented. Note that when the press ring 7 is moved in the directions of arrows A and B, the compressed air in the fluid chamber 7b is drained, and the expansion membrane 7c, which has been in a bulged state, is removed as shown by the dotted line in FIG. This state changes to the state shown by the solid line that coincides with the inner periphery of the press ring 7, and the press ring 7 moves smoothly in the directions of arrows A and B.

(g) 0 Effects of the Invention As explained above, according to the present invention, the outer shell 2 is provided,
A press ring 7 is placed inside the outer shell 2 in the axial direction of the outer shell 2 (
[In the excavator 1, the flexible expansion film 7c is provided inside the press ring 7 in an annular shape so that it can be expanded and contracted freely. By expanding the press ring 7 inward, the water supply between the earth 19 and the inside of the shield excavator 1 is blocked, making it possible to prevent groundwater from flowing into the inside of the shield excavator 1.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of a shield excavator according to the present invention, and FIG. 2 is an enlarged view of a press ring portion. 1...Shield excavator 2...Outer shell 7...Press ring 7c...Expansible membrane Applicant Mitsui Construction Co., Ltd.

Claims (1)

[Scope of Claims] A shield excavator having an outer shell and a press ring provided inside the outer shell so as to be movable and driven in the axial direction of the outer shell, comprising: an expansion device having flexibility inside the press ring; A shield excavator consisting of a ring-shaped membrane that can expand and contract freely.