JPH0483091A - Shield excavator - Google Patents

Abstract

PURPOSE:To facilitate execution along a sharp curve by forming a skin plate in a shield body of a flexible pipe and drawing a wire provided in the skin plate with a traction means to bend the shield body. CONSTITUTION:A traction means 6 is adjusted to equalize the length of each wire 4 in straight execution. A skin plate 1a is formed into a straight cylinder- like form to be propelled in a shield body l and excavate a facing with a cutter head 2. In the execution along a sharp curve, a wire 4 located on the inner diameter side of the sharp curve is drawn by a traction means 6 to contract an expansible member 1c for bending the shield body l. Under such a condition, tunneling along the sharp curve is executed by excavating with the cutter head 2 while propelling the shield body l, so that the execution along the sharp curve needs hardly surplus excavation and the efficiency of excavation can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a shield tunneling machine in which a skin plate of a shield body is formed of a flexible tube.

(Conventional technology) For conventional shield excavation machines that excavate tunnels.

There is a structure in which the shield main body is divided into a plurality of front shields and rear shields, and the space between these shields is made flexible by an articulated jack, so that construction can be performed along three curves.

In addition, the outer peripheral surface of the conventional shield body is covered with a skin plate made of a steel plate.

As shown in Figure 5, between the front shield a and the rear shield b, a part of the skin plate is slidable to prevent a gap from occurring even when the shields a and b are bent. A fitted fitting portion C is provided.

In the conventional shield tunneling machine as described above, by bending the space between the front shield a and the rear shield b, the amount of over-excavation δ during curved construction can be reduced compared to a shield tunneling machine in which the shield body is integrated. It can be reduced.

(Problem B to be solved by the invention) However, when the radius of curvature R becomes small, such as when constructing a sharp curve, the center bending angle θ increases and the fitting portion C becomes
Otherwise, the gap between the fitting part C becomes large and sealing becomes difficult.

Conventional shield-based excavators had problems such as difficulty in construction along sharp curves.

This invention was made with the aim of improving the above-mentioned problems, and provides a shield excavator in which a large bending angle can be obtained by forming the skin plate of the shield body from a flexible tube, so that construction along sharp curves is possible. This is designed to be easy to do.

(Means and Effects for Solving the Problems) In order to achieve the above object, the present invention provides shield excavation in which a tunnel is excavated by propelling a shield body having a cutter head at the front part into the ground by a propulsion jack. In this machine, the skin plate of the shield main body is formed of a flexible tube so that the shield main body can be bent along a sharp curve when constructing a sharp curve.

This allows construction along sharp curves with almost no need for over-excavation, and by providing multiple wires in the expansion and contraction direction within the skin plate and pulling these wires with a traction means, the shield Because the main body can be bent.

The refraction mechanism can also be easily constructed.

(Example) An example of this invention is shown in Figures 1 to 4 (<) and (
This will be explained in detail with reference to the drawing shown in D).

In the figure, reference numeral 1 denotes a shield body, and a cutter head 2 rotated by a cutter motor (not shown) is provided at the front of the shield body.This cutter head 2 excavates a face in front of the shield body 1, and A tail seal member 3 is provided at the rear end of the main body 1 to seal a gap between the outer peripheral surface of a segment (not shown) assembled along the inner wall of the tunnel excavated by the shield main body 1 and the shield main body 1. There is.

Further, the outer peripheral surface of the shield body 1 is covered with a skin plate 1a made of a flexible tube.

The above-mentioned skin play) 1a is a structure in which rings 1b made of a large number of iron plates provided in the front-rear direction of the shield body 1 are connected to each other by an elastic member 1c made of an elastic material such as natural rubber. The strength is ensured.

Further, the elastic member IC connecting each ring 1b is formed to have a thinner center portion than both end portions in order to facilitate expansion and contraction in the direction of contact and separation of each ring 1b.

In addition, hollow portions 1d are formed in the thick portions at both ends, and both end surfaces of the expandable member IC are baked onto the ring 1b by vulcanization.

On the other hand, in order to protect the elastic member 1c, the elastic member 1c is covered with a protective layer 1e made of a spring rope bent in a substantially V shape, and a wire 4 is connected in the circumferential direction at the center of the ring 1b and the elastic member 1c in the thickness direction. It is inserted in multiple stripes at equal intervals.

The front end of these wires 4 is tied to the cutter head 2, and the rear end is connected to a plurality of winches installed in the shield body 1 after bypassing a guide roller 5 provided in the tail seal member 3. It is caught in the traction means 6.

Next, to explain the operation, during straight construction, the traction means 6 is adjusted so that the length of each wire 4 is the same, so the skin play (1a) of the shield body 1 has a straight cylindrical shape. Therefore, the centers of the cutter head 2 and tail seal member 3 are also located on the center of the shield body 1, and the skin play (1) as shown in FIG.
The telescopic member 1c of a is extended.

In this state, the shield main body 1 is propelled by a shield jack (not shown) and a face is excavated by the cutter head 2, thereby making it possible to excavate a tunnel in a straight line.

Next, when constructing a sharp curve, the wire 4 located on the inner diameter side of the sharp curve is pulled by the traction means 6, and the skin plate 1a is
The extensible member 1c constituting the is contracted as shown in FIG. 4(U).

As a result, the shield body 1 is bent along a sharp curve as shown in FIG.
By excavating with the cutter head 2 while propelling the tunnel, it becomes possible to excavate a tunnel along a curved line.

In addition, when constructing a straight line or a sharp curve, the shield body 1 is kept in a straight or bent state by means of two articulated jacks (not shown).

(Effects of the Invention) As described in detail above, in the present invention, since the skin plate of the shield main body is formed of a flexible tube, it can be easily bent along a sharp curve.

This allows construction along sharp curves with almost no need for over-excavation, increasing excavation efficiency when constructing sharp curves, and making it difficult to seal even when bent along curves. No such problem will occur.

[Brief explanation of the drawing]

Fig. 1 is a schematic configuration diagram of an excavator according to an embodiment of the present invention, Fig. 2 is an enlarged sectional view of a skin plate, and Fig. 3 is an enlarged sectional view of a skin plate.
A cross-sectional view taken along the line of Figure ■-■. Fig. 4 ((), (D) is an explanatory diagram of the action, and Fig. 5 is an explanatory diagram of the conventional method. 1...Shield body, 1a...Skin plate. 1b...Ring, lc... Expandable member. 2... Cutter head 5 4... Wire. 6... Traction means. Patent applicant: Komatsu Ltd.
Person Patent attorney Osamu Matsuzawa (and 1 other person) Figure 2 Figure 1 Figure 3 Figure (a) Figure (cut\ Figure

Claims (3)

[Claims] (1) In a shield excavator that excavates a tunnel by propelling a shield body 1 having a cutter head 2 at the front underground into the ground using a propulsion jack, the skin plate 1a of the shield body 1 is formed of a flexible tube. , a shield excavator in which a shield body 1 can be bent along a sharp curve when constructing a sharp curve. (2) The skin plate 1a is constituted by a large number of rings 1b provided in the front-rear direction of the shield body 1, and an elastic member 1c made of an elastic material such as rubber that connects these rings 1b. shield tunneling machine. (3) A plurality of wires 4 are inserted into the skin plate 1a in the direction of expansion and contraction, and the wires 4 are appropriately pulled by a pulling means 6 to bend the shield body 1. (1) The shield excavator described.