JPH086869Y2 - Shield machine - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a shield machine for continuously performing curved construction in the same direction, which is used for construction of an underground dome.

[Conventional technology]

Construction of an underground dome using the shield method has been proposed as one of the ideas for using underground space (Yoshihiko Kono: Utilization of underground space and construction technology, construction machinery 1989.1). This proposal is to construct a circular or spiral shield tunnel by curving in the same direction, and to make a dome-shaped underground space based on this.

Conventionally, as a curve construction technology in shield construction,
(1) Method of over-digging and one-sided pushing of the shield jack,
(2) There is a method of using a shield excavator with a one- or two-stage intermediate-breaking structure, but the most advanced methods of sharp curve construction required for underground dome construction are (1) and (2 This is a method of reducing the amount of excess digging by using a middle-break type shield machine.

FIG. 4 is a horizontal cross-sectional view showing an example of a conventional center-breaking shield machine, and FIG. 5 is a detailed view of its part A, which has a straight shield hull 1A 'and a front shield A'. The rear shield B'having the shield hull 1B 'is elastically connected via a plurality of middle folding jacks 2 arranged along the inner circumference of the shield hulls 1A', 1B ', and the front shield A' The cutter wheel 3 and the cutter driving device 4 mounted on the rear part excavate, and the shield jack 5 and the erector 6 mounted on the rear shield B'perform segment assembly and shield propulsion. In the figure, 7 is an overcutting cutter, 8 is a tail seal, 9 is a tail seal mounting plate, and 10
Is a segment.

[Problems to be solved by the device]

The above-mentioned prior art has the following problems.

(I) The structure of the center-break type shield machine is complicated, and it is difficult to increase the number of center-break stages.

(II) Since the shield hull itself has a straight shape even with a center-folding structure, the amount of overdue increases when a sharp curve is constructed.

(III) In the case of a sharp curve, it is easy for the segment to contact the tail seal mounting plate or tail plate.
It is necessary to increase the tail clearance x (see FIG. 5). In particular, when the construction is performed at a large depth and under high water pressure, the number of steps of the tail seal increases, and the tail seal mounting plate portion increases accordingly, so that the tail clearance further increases.

(IV) Due to the increase in the tail clearance, the tail seal becomes fully extended outside the curve of the planned excavation route, so reversal due to external pressure may occur and the sealability may not be maintained (see Fig. 5). .

(V) In sharp curve construction, the shield machine and the segment are in a floating state in the already-excavated tunnel due to the increase in the excess digging amount and the tail clearance described above, which makes it difficult to control the direction of the shield machine. In particular, when the segment is propelled as a reaction force reception by the shield jack and the segment itself which receives the reaction force largely moves, direction control becomes impossible.

An object of the present invention is to solve the above-mentioned problems of the prior art and to provide a shield machine suitable for applications such as underground dome construction in which continuous sharp curve construction in the same direction is continuously performed.

[Means for solving the problem]

In order to achieve the above object, the present invention is characterized in that the shape of the shield hull in the longitudinal direction is an arc shape or a pseudo arc shape having a curvature substantially matching the curvature of the planned excavation route.

[Action]

The shield machine of the present invention is propelled by pushing the shield jack one-sided so that the center line of the shield hull is along the planned excavation line (tunnel center line). Since the shape of the shield hull in the lengthwise direction is an arc shape or a pseudo arc shape with a curvature that substantially matches the curvature of the planned excavation route, the amount of excess digging may be approximately the same as during straight line digging even during sharp curve construction, Further, since the shield hull is located along the segment, the clearance between the tail seal mounting plate and the segment can be kept substantially constant, and the tail clearance can be small.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is a horizontal sectional view showing the excavation state of the first embodiment of the present invention. In this embodiment, the shield hull 1 has an integral structure in which the shape in the lengthwise direction has an arcuate shape with the same curvature as the planned excavation route (tunnel center line) 11, and the shield hull 1
In the example in which the cutter wheel 3, the cutter driving device 4, the shield jack 5, and the segment assembling erector 6 are installed, the curving in the same direction is continuously performed by the digging by the extendable digging cutter 7 and the pushing of the shield jack 5 by one side. It can be done by If this shield machine is curved without any gradient, an annular tunnel with a radius R will be constructed. Also,
A spiral tunnel with a radius R can be constructed by excavating a curve at a certain gradient.

 According to this embodiment, the following effects can be obtained.

(I) The structure is simple because there is no center bending mechanism.

(Ii) In this example, the center of the cutter is slightly displaced from the planned excavation line, so extra excavation for direction correction is required, but basically the amount of extra excavation may be about the same as when straight excavation. (Use only for minute direction correction).

(Iii) Since the shield hull 1 is located along the segment 10, the tail clearance may be small.

(Iv) Since the clearance between the tail seal mounting plate 9 and the segment 10 is kept substantially constant, the tail seal 8 is unlikely to be inverted and the sealing performance can be secured.

(V) Since the excess excavation amount and the tail clearance may be small even in the case of sharp curve construction, the deflection amount of the segment that receives the reaction force during the shield excavation is small, and the direction control of the shield excavator is easy.

In the above configuration, the curvature of the shield hull in the length direction and the curvature of the planned excavation route do not necessarily have to match.
The curvature of the planned excavation route may change on the way, but in that case, when the average curvature of the planned excavation route is adjusted to the minimum curvature in the length direction of the shield hull, when constructing parts with different curvatures Can be dealt with by pushing the shield jack on one side and over digging.

Further, in the above embodiment, the shape of the shield hull in the lengthwise direction is an arc shape, but it may be a pseudo arc shape such as a polygonal shape.

FIG. 2 is a horizontal sectional view showing the excavation state of the second embodiment of the present invention.

In this embodiment, the shield machine of the first embodiment is divided into a front shield A and a rear shield B, and has a center-folding structure. However, the shield hull 1A of the front shield and the shield hull 1B of the rear shield are formed. The shape of each of the lengthwise directions is an arc shape having a curvature substantially matching the curvature of the planned excavation route 11 as in the first embodiment. Otherwise, the structure is the same as that of the center-breaking shield machine shown in FIG. 4, and the corresponding parts are indicated by the same reference numerals and the description thereof is omitted.

The effect of the present embodiment is almost the same as that of the first embodiment, but when the curvature of the planned excavation route changes greatly, the amount of excess digging is reduced by using the center bending mechanism, and the curvature of the planned excavation route changes. Can be made easier to deal with.

FIG. 3 is a plan view showing the excavation state of the third embodiment of the present invention.

Similar to the first embodiment, the shape of the shield hull 1 in the longitudinal direction is an arc shape having the same curvature as the planned excavation route 11. Further, in the present embodiment, the cutter wheel 3 is attached at an angle such that the face excavation surface 3a of the cutter wheel coincides with the normal direction passing through the curve center of the route. Therefore, the face excavation surface 3a
Will be oriented vertically to the planned excavation route 11, and if the curvature of the route is constant, it will have the same relationship as during straight excavation, so the amount of excess excavation may be a minute amount to eliminate excavation sliding resistance. , Basically, there is no need to dig.

[Effects of the Invention] As described above, according to the present invention, the amount of excess digging and the tail clearance at the time of sharp curve construction can be reduced to about the same level as the straight digging without complicating the structure. In addition, the backfill injection amount can be reduced to reduce the construction cost, the sealing property of the tail seal can be secured, and the direction of the shield machine can be easily controlled.Therefore, the curved construction in the same direction such as underground dome construction can be performed. It is possible to realize a shield machine suitable for continuous use.

[Brief description of drawings]

1 is a horizontal sectional view showing the excavation state of the first embodiment of the present invention, FIG. 2 is a horizontal sectional view showing the excavation state of the second embodiment of the present invention, and FIG. 3 is a third embodiment of the present invention. FIG. 4 is a plan view showing an example of the excavation state, FIG. 4 is a horizontal sectional view showing the state of excavation of a conventional center-folding shield excavator, and FIG. 1, 1A, 1B ... Arc-shaped shield hull, 11 ... Expected excavation route,
3 ... Cutter wheel, 4 ... Cutter drive device, 5 ... Shield jack, 6 ... Electa for segment assembly, 8 ... Tail seal, 10 ... Segment.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (71) Applicant 999999999 Komatsu Ltd. 2-3-6 Akasaka, Minato-ku, Tokyo (71) Applicant 999999999 2-16-1 Kyobashi, Chuo-ku, Tokyo Shimizu Corporation ( 71) Applicant 999999999 Taisei Corporation 1-25-1 Nishishinjuku, Shinjuku-ku, Tokyo (71) Applicant 999999999 Central Research Institute of Electric Power Industry 1-16-1 Otemachi, Chiyoda-ku, Tokyo (71) Applicant 999999999 FUJITA Co., Ltd. 4-6-15 Sendagaya, Shibuya-ku, Tokyo (72) Inventor Kiyoshi Tsuchiya 650 Kuchidachi-cho, Tsuchiura-shi, Ibaraki Hitachi Construction Machinery Co., Ltd. Tsuchiura factory (72) Inventor, Yasushi Ishikawa Tsuchiura-shi, Ibaraki 650 Kandomachi, Tsuchiura Plant, Hitachi Construction Machinery Co., Ltd. (72) Fumiya Takano, 650, Kachimachi, Tsuchiura City, Ibaraki Prefecture, Tsuchiura Plant, Hitachi Construction Machinery Co., Ltd. (72) Inventor Yama-saki Eiji 650 Kazutachi-cho, Tsuchiura-shi, Ibaraki Hitachi Construction Machinery Co., Ltd. Tsuchiura Plant (72) Inventor Hitoshi Takahashi 650, Jinmachi-cho, Tsuchiura-shi, Ibaraki Hitachi Construction Machinery Co., Ltd. Tsuchiura Plant (72) Inventor, Yasuo Mori, 650, Jinrachi-cho, Tsuchiura, Ibaraki Prefecture, Tsuchiura Plant, Hitachi Construction Machinery Co., Ltd. (56) References JP58-13898 (JP, A) JP63-251598 (JP, A)

Claims (1)

[Scope of utility model registration request] Claims: 1. A face is excavated by a cutter wheel mounted on the front surface of a shield hull, and a segment assembled in a tunnel is propelled by a shield jack as a reaction force receiving. A shield machine having a tail seal, wherein the shape of the shield hull in the longitudinal direction is an arc shape or a pseudo arc shape having a curvature substantially matching the curvature of the planned excavation route. Machine.