JPH0735913Y2 - Shield machine tail structure - Google Patents

Description

[Detailed description of the device] [Industrial applications]

The present invention relates to a shield machine, and more particularly to a tail structure devised to enable sharp curve construction.

[Prior art]

Conventionally, there were the following three methods for constructing a sharp curve in the shield construction method. (1) Make the shield machine a mid-folding structure. As shown in Fig. 10, this is a shield machine 1 with a front body 2 and a rear body 3
And a three-stage center folding structure as described in JP-A-62-284893, and the shield machine is straightly folded at the center folding part. It is bent like this. (2) Overcut the inside of the curved section of the tunnel with a copy cutter. In this method, as shown in FIG. 11, the excavation direction is bent while the excavation inside the tunnel curve portion is excessively performed by the copy cutter 4 mounted on the shield machine 1. (3) A taper segment (deformed segment) is used as the lining segment. As shown in FIG. 12, the taper segment 5 having a taper in the axial direction is used to gradually change the extrusion direction of the shield machine 1. To increase the degree of change,
In the one disclosed in Japanese Laid-Open Patent Publication No. 63-22999, the radius of curvature of the outer surface of the tapered segment is made smaller than that of a normal segment.

[Problems to be solved by the device]

In the case of the above (1), there was a problem that the amount of excess digging becomes large and the segment is also adversely affected. The method (2) has a problem in that there is no clearance between the steel tail of the shield machine and the concrete segment during curve construction, and the segment is broken. In the method (3), it is necessary to prepare a different-shaped segment, and its installation also requires a technique, which causes a problem that the construction cost is high. In addition, in any of (1), (2), and (3), since the shield machine tail is straight, in the case of the cast-in-place lining method in which concrete is hardened and pushed out in the tail, the shield machine tail is used at the time of curve construction. There was a risk of damaging the concrete lining. The present invention solves such problems, and an object of the present invention is to provide a tail structure capable of smoothly bending a shield machine at a curved section of a tunnel, having a simple bending structure, and also having good waterproofness. And

[Means for Solving the Problems]

According to the present invention, the tail portion of the outer shell of the shield machine is divided into a plurality of rings whose inner surface is coated with an elastic material such as rubber, and these rings are tensioned by a tension introducing mechanism while an elastic material such as rubber is interposed. Is introduced and the whole is polymerized and connected to be bendable in a cylindrical shape.

[Action]

The shield machine tail portion can be arbitrarily bent by expanding / contracting the elastic material interposed between the rings or by adjusting the tension of the tension introducing mechanism to shift the rings from each other. Water between the rings is stopped by an elastic material that is given a compressive force by a tension introduction mechanism, and the inner surface of the rings is coated with an elastic material, so that the water resistance is good and
Adhesion of lining concrete etc. can be prevented.

【Example】

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Fig. 2 is an overall schematic view of the shield machine 10, its tail section 11
The present invention is applied to FIG. 1, and FIG. 1 is a sectional perspective view of a part of the tail portion 11. The tail portion 11 has a plurality of steel rings 13 whose entire surface is individually covered with a rubber 12, and a plurality of wires 14 which are penetrated at predetermined intervals in the circumferential direction.
And is connected in a tubular shape. Each wire 14 penetrates through a through hole 15 provided in the ring 13 in the axial direction, and is tightly connected so as to sandwich all the rings 13 between the annular pressing plates 16 at both ends thereof. Both ends of the wire 14 are fixed to the pressing plate 16 by the stoppers 17 capable of adjusting the tension of the wire 14, and the wire 14, the stopper 17, the pressing plate 16 and the tension introducing mechanism are constituted. When all the wires 14 are in a substantially equal tension state as shown in FIG. 3, the rubber 12 interposed between the rings 13 contracts to the same extent in all the circumferential portions, so that the tail portion 11 moves to the fourth position. As shown in the figure, it becomes a straight cylindrical shape as a whole. Therefore,
When excavating the straight part of the tunnel, the tail part 11 may be excavated as shown in FIG. When excavating the curved portion of the tunnel, the wire 14 on the outside of the curved portion is loosened as shown in FIG. 5, and the wire 14 on the inside is tightened as shown in FIG. In this way, the rubber 12 between the rings 13 expands outside the curved portion and contracts further inside the curved portion, so that the tail portion 11 has a curvature corresponding to the curved portion to be excavated as shown in FIG. It can be a bent cylinder. The tension of the wires 14 should be almost the same, and the rings 13 should be 8th
Even if it is displaced in the direction perpendicular to the axis as shown,
Although not as smooth as in FIG. 7, 11 can be bent with an arbitrary curvature as a whole as shown in FIG. In this case, the inner diameter of the through hole 15 is set to be slightly larger than the outer diameter of the wire 14. In any of FIG. 3, FIG. 5, FIG. 6 and FIG.
The rubber 12 between the rings 13 functions as a sealing material for stopping the water between the rings 13, and since the rubber 12 individually covers the entire surface of the rings 13, the water stopping property is very good. Also, rubber 12
Also prevents adhesion of lining concrete or the like particularly on the inner peripheral surface of the ring 13. However, the rubber 12 allows the tail 11 to bend,
It is only necessary to satisfy the two points of stopping the water between the ring 13 and the ring 13, and it is not always necessary to cover the entire surface of the ring 13. Further, any material other than rubber may be used as long as it is an elastic material satisfying the above two points. Further, the material of the ring 13 is not limited to steel, and hard synthetic resin or the like may be used. Further, the rings 13 may be connected to each other by a tie rod or the like instead of the wire.

[Effect of device]

The present invention has the following effects. The shield machine draws a smooth curve in the curved section of the tunnel, so the amount of excess digging is small. The tail of the shield machine and the concrete segment are no longer in contact with each other, and problems such as damage to the segment are eliminated. Depending on the degree of the curved portion, it is not necessary to adopt a structure for bending the shield machine at all, and even if the structure is small, a small bending angle is required, which simplifies the structure. Even in the case of the cast-in-place lining method in which concrete is poured in the tail part of the shield machine and hardened and then extruded, the construction of the curved portion becomes easy, and the concrete lining is not damaged during the construction of the curved portion. The bending angle can be easily adjusted by adjusting the tension of the tension adjusting mechanism to adjust the degree of compression of the elastic material between the rings or by shifting the rings from each other. Water between the rings is stopped by a stretchable material that is given a compressive force by a tension introducing mechanism, and the inner surface of the rings is coated with a stretchable material, so the water resistance is good and
Adhesion of lining concrete etc. can be prevented.

[Brief description of drawings]

FIG. 1 is a sectional perspective view of an example of a tail structure according to the present invention,
FIG. 2 is a schematic configuration diagram of a shield machine to which the tail structure is applied, FIG. 3 is an enlarged cross-sectional view of the case where the tail portion is straightened, FIG. 4 is the same perspective view, and FIGS. Sectional views of different parts when the tail part is bent, FIG. 7 is a perspective view of the bent tail part, FIG. 8 is a cross-sectional view when the tail part is bent with steps, and FIG. 9 is the same perspective view. FIG. 10, FIG. 11 and FIG. 12 are explanatory views of a conventional example. 10 …… Shield machine, 11 …… Tail part, 12 …… Rubber, 13…
… Rings, 14… Wires, 16… Holding plates, 17… Stoppers.

Claims (1)

[Scope of utility model registration request] Claim: What is claimed is: 1. A tail portion of an outer shell of a shield machine is divided into a plurality of rings, at least the inner surface of which is coated with a stretchable material such as rubber. A tail structure for a shield machine, which is characterized in that it is superposed in a tubular shape so that it can be bent as a whole by introducing tension.