JP2586951Y2 - Rectangular shield - Google Patents

Description

[Detailed description of the invention]

[0001]

The present invention relates to a rectangular shield, in particular,
The machine relates to a box-shaped rectangular shield.

[0002]

2. Description of the Related Art It is generally known that a shield machine having a cylindrical machine body is strong against external force and has a small deformation amount, so that the thickness of the machine body can be reduced. On the other hand, a box-shaped rectangular shield with a machine body
Because the machine body is weak against external force and the amount of deformation is large,
It is necessary to increase the thickness of the machine body or reinforce it with a reinforcing material such as a bracket.

That is, as shown in FIG. 4, a box-shaped rectangular shield M is formed of a tunnel excavation part 11 having a cutter head 10 at a head and a tail plate part 12 as a segment assembly part. Its cross section is rectangular or square. It should be noted that, in the figure, the symbol A
Indicates the direction of tunnel excavation. Since the above-mentioned tail plate portion 12 is not usually reinforced by a reinforcing member such as a bracket, for example, when excavating a location having a high external pressure P such as a large depth, the tail plate portion 12 is indicated by a dashed line. Curved inward to the tail plate 12
And the gap between the assembly and the segment being assembled (not shown),
The tail clearance became narrower, which could hinder the assembly of the segments.

[0004] Therefore, a sufficient plate thickness and a reinforcing material corresponding to the external pressure P are required. Particularly, in a rectangular shield having a large cross section and a large aspect ratio, there is a problem that the plate thickness and the reinforcing material become too large.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to overcome such a conventional problem, and its purpose is to increase the thickness of a tail plate portion,
An object of the present invention is to provide a rectangular shield that can prevent deformation of a tail plate portion due to external pressure without reinforcing with a reinforcing material.

[0006]

A rectangular shield according to the present invention, which can achieve the above object, abuts an existing segment in at least two of the four upper, lower, left, and right side walls of a tail plate. A tail plate support is attached. Since the tail plate support is in contact with the existing segment, deformation of the tail plate portion can be prevented even when external pressure acts on the tail plate portion.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a tail plate portion 12 of a box-shaped rectangular shield M according to the present invention, and a ring girder 2 as a reinforcing material is provided at a front end of the tail plate portion 12. Further, a tail packing 3 is provided at the rear end of the tail plate portion 12, and the tail plate portion 12 is provided.
And the existing segment 4 prevents muddy water from entering. Reference numeral 9 denotes a shield jack.

On the inner surfaces of the upper and lower side walls 12a and 12b of the tail plate 12 facing the segment 4,
Attach the tail plate support 5 that contacts the segment 4. The tail plate support 5 is formed from a metal roller 5a and its support 5b. As shown in FIG. 2, when the cross section of the tail plate portion 12 is rectangular, a plurality of the tail plate supports 5 are provided only at the upper and lower side wall portions 12a and 12b having a long span (in FIG. ).

However, if desired, the tail plate support 5 may be added to the left and right side walls 12c and 12d. On the other hand, as shown in FIG. 3, when the cross section is square, the four side walls 12a,
12b, 12c, and 12d, respectively. As described above, since the tail plate support 5 attached to the tail plate portion 12 is in contact with the existing segment 4, deformation of the tail plate portion 12 is prevented even if the thickness of the tail plate portion 12 is conventional. Can be prevented.

Therefore, the clearance C between the tail plate portion 12 and the segment 4 can be secured, and no support is required when the new segment 40 is assembled. In the above description, the case where the tail plate portion 12 is supported by the roller-type tail plate support 5 has been described.
The present invention is not limited to this. For example, FIG.
As shown in FIG. 6, the tail plate support 5 may be of a hydraulic jack type. Here, 5c indicates a hydraulic jack, 5d indicates a hydraulic pipe, and 5e indicates a jack mounting bracket.

As shown in FIGS. 7 and 8, the tail plate support 5 may be of a spring type. Where 5
f indicates a spring receiver, 5g indicates a spring, and 5h indicates a spring mounting bracket. Further, as shown in FIGS. 9 and 10, a rubber tube system may be used. Here, 5i is a rubber tube, 5j is a tube holding fitting, and 5k is a compressed air injection pipe.

[0012]

As described above, according to the present invention, the tail plate support which comes into contact with the existing segment is attached to at least two side walls of the tail plate which are opposed to each other, among the four sides of the tail plate. In addition, the tail plate can be prevented from being deformed by external pressure without increasing the thickness of the tail plate or reinforcing with a reinforcing material. As a result, the thickness of the tail plate portion can be reduced, and the rectangular shield can be manufactured easily and at low cost.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a main part of a rectangular shield according to the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a cross-sectional view of another embodiment of the rectangular shield according to the present invention.

FIG. 4 is a perspective view of a rectangular shield.

FIG. 5 is a longitudinal sectional view of a main part of the rectangular shield according to the present invention.

FIG. 6 is a sectional view taken along line VI-VI of FIG. 1;

FIG. 7 is a longitudinal sectional view of a main part of the rectangular shield according to the present invention.

FIG. 8 is a sectional view taken along line VIII-VIII of FIG.

FIG. 9 is a longitudinal sectional view of a main part of the rectangular shield according to the present invention.

FIG. 10 is a sectional view taken along line XX of FIG. 1;

[Explanation of symbols]

4 Existing Segment 5 Tail Plate Support 12 Tail Plate 12a, 12b, 12
c, 12d Side wall surface

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-6-1466783 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) E21D 9/06 302 E21D 9/06 301

Claims (1)

(57) [Scope of request for utility model registration] 1. A rectangular shield, wherein a tail plate support that abuts on an existing segment is attached to at least two of the four side walls of the tail plate that are opposed to each other.