JPH0455592A - Shield excavator - Google Patents

Abstract

PURPOSE:To simplify control on the bending excavation of shield by a method in which an articulate mechanism is made up of a spherically curved slide part and a fitting part with a fit groove on its peripheral end side, and the inner end side of the slide part and the fit part are fixed to a shield. CONSTITUTION:An articulate mechanism 2 is made up of a slide part 2a on the rear end of a front shield la and a pair of fit parts 2b and 2c to hold the part 2a from front and back sides. The part 2a is shaped into an annular plate form, in which it is spherically curved concentrically with a shield 1 and a small-diameter round hole 2d is formed in the central part. A cylindrical part 1c is connected to the inner surface of the hole 2d, the part 2a is attached to the front shield 1a side, and a sealer is housed in the annular groove 2e. A fit groove 2f is formed on the joint of the fit parts 2b and 2c, and the inner and ouer faces of the part 2a are slit on the inner surface of the groove 2f. The structure of the mechanism 2 can thus be simplified.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an articulated shield excavator capable of excavating along sharp curves.

(Prior art) As shown in Fig. 4, conventional shield tunneling machines are of an articulated type in which a shield main body a is divided into a front shield b and a rear shield C, and the space between these parts can be bent freely. is publicly known.

The above articulated shield excavator.

By bending the space between the front shield b and the rear shield C as shown in Figure 5, curved construction is possible.
At the bent portions of the front shield b and the rear shield C, an articulating mechanism e having a one-spherical sealing surface d is provided.

(Problem to be solved by the invention) In the conventional articulating mechanism e mentioned above.

In order to obtain a large refraction angle, the sealing surface d is machined into a spherical shape, but it is necessary to use a pin or the like to prevent the mating part from coming off when the space between the two front and rear shield tunneling machines is bent significantly. However, there was a problem that the structure of the articulating mechanism e was complicated.

In addition, in order to obtain a large refraction angle, it is necessary to increase the length of the sealing surface d as shown in Figure 6, so the articulating mechanism e has become larger and the shield tunneling machine has been refracted greatly. In this case, there were problems such as the effective diameter inside the shield becoming smaller.

This invention was made with the aim of improving the above-mentioned problems, and aims to provide an articulated shield excavator that does not require a pull-out stop and can obtain a large bending angle with a small articulated mechanism. It's something to do.

(Means and effects for solving the problem) In order to achieve the above object, the present invention divides the shield main body into a front shield and a rear shield, and connects these front and rear shields in a flexible manner by an articulating mechanism. In the shield tunneling machine, the articulate mechanism includes a sliding member formed by curving an annular plate into a spherical shape, and a spherical fitting in which the outer peripheral end of the sliding member is slidably fitted. It is constituted by a fitting member having a groove, and the inner peripheral end side of the sliding member is fixed to one of the front and rear shields, and the fitting member is fixed to the other side.

As a result, when the front and rear shields are bent, the sliding member slides within the fitting groove of the fitting member, and the space between the front and rear shields is bent around the center point of one spherical surface, and the sliding member moves from the fitting groove. Since it does not come out, there is no need for a separate mechanism to prevent it from coming out.

(Embodiment) An embodiment of the present invention will be described in detail with reference to FIGS. 1 to 3.

In Fig. 1, 1 is the shield main body, and the front shield 1a
and a rear shield 1b, and these shields 1a and Ib0 are connected by an articule 1142.

As shown in FIG. 2, the articulating mechanism 2 has the following features:
a sliding member 2a provided at the rear end of the front shield 1a;
It consists of a pair of fitting members 2b and 2c that sandwich the sliding member 2a from the front and back directions.

The sliding member 2a is formed of an annular plate,
It is curved to have the same curvature as a part of the spherical surface centered on the center point provided on the center line of the shield body 1, and has a diameter slightly smaller than the inner diameter of the fitting members 2b and 2c at the center. A circular hole 2d is opened.

A cylindrical portion 1c protruding from the rear end of the front and rear shield 1aO is connected to the inner peripheral portion of the circular hole 2d, and the sliding member 2a is connected to the front shield excavator through this cylindrical portion IC. An annular groove 2e is formed on the outer peripheral surface of the sliding member 2a, and a seal ring is housed in the annular groove 2e.

Further, the fitting members 2b and 2c that sandwich the sliding member 2a from the front and back directions are each shaped like an annular ring, and the rear fitting member 2C is fixed to the front end of the rear shield 1b. A front fitting member 2b is attached to the front surface of 2C by a fixing member 4.

A fitting groove 2f into which the sliding member 2a fits is formed in the mating surfaces of these fitting members 2b and 2c.

Like the sliding member 2a, the fitting groove 2f is curved to the same curvature as a part of a spherical surface centered on the center point O, so that the inner and outer circumferential surfaces of the sliding member 2a slide on the inner surface of the fitting groove 2f. Along with being moved.

The fitting groove 2f is pre-formed to a length that will not interfere with the tip of the sliding member 2a even if the front shield 1a is bent at a large bending angle with respect to the rear shield 1b.

A seal ring 3 provided on the outer peripheral surface of the sliding member 2a is pressed against the front inner surface of the fitting groove 2f to prevent dirt, water, etc. from entering the shield body 1.

Next, to explain the operation, when directly constructing the shield using the shield body 1, the front shield 1a and the rear shield 1b are held in a straight line as shown by the solid line in FIG. A cutter head (not shown) provided at the front end of the front shield 1a excavates while excavating the face.

In addition, when constructing a curve, the front shield 1a is connected to the rear shield 1b by an articulated jack (not shown) provided on the front shield 1a and the rear shield jack.
a is refracted as shown by the imaginary line in FIG.

At this time, a sliding member 2a of the articulating mechanism 2 that connects the front shield 1a and the rear shield 1b in a flexible manner
slides within the fitting grooves 2f of the fitting members 2b, 2c,
The front shield 1a is bent around the center point 0, and the sliding member 2a does not come out of the fitting groove 2f even if it is bent at a large center bending angle, so it is prevented from being pulled out as in the conventional case. There is no need to provide a mechanism.

Furthermore, when the shield main body 1 is propelled in a refracted state, the thrust force acting on the front shield 1a is
The signal is transmitted to the rear shield 1b by an articulated jack (not shown) provided between the rear shield 1b and the rear shield 1b.

(Effects of the Invention) As described in detail above, the present invention provides an articulating mechanism that connects the front shield and the rear shield in a flexible manner using a sliding member formed in a 9-spherical shape, and this sliding member slidingly connecting the front shield and the rear shield. Since it is constructed from a fitting member having a fitting groove that can be fitted freely, when the front and rear shields are bent, the front and rear shields are bent around the center point of the spherical surface of the sliding member.

Bend 1111? In addition, even if the sliding member is bent at a large center bending angle, it will not come out of the fitting groove, so there is no need to provide a mechanism to prevent it from coming out, which simplifies the structure of the articulate mechanism. can be converted into

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a part of a shield tunneling machine according to an embodiment of the present invention, FIG. 2 is an enlarged view of the articulating mechanism shown in FIG. 1, FIG. FIG. 6 is an explanatory diagram of the conventional one. 1... Shield body. 1a...Front shield. 1b... Rear shield. 2...Articulating mechanism 5 2a...Sliding member. 2b, 2c... Fitting members. 2f... Fitting groove. 3... Seal ring. Patent Applicant: Komatsu Ltd. (Patent Attorney) Osamu Matsuzawa (and 1 other person) Figure 1 Figure Figure Figure Figure Figure

Claims (2)

[Claims] (1) In a shield excavator in which the shield body 1 is divided into a front shield 1a and a rear shield 1b, and these front shields 1a and 1b are connected in a flexible manner by an articulating mechanism 2, the articulating mechanism 2 A sliding member 2a formed by curving an annular plate into a spherical shape, and a fitting member 2b having a spherical fitting groove 2f into which the outer peripheral end of the sliding member 2a is slidably fitted. , 2c, and the front and rear shields 1
A shield excavator in which the inner peripheral end side of a sliding member 2a is fixed to one of a and 1b, and the fitting members 2b and 2c are fixed to the other. (2) The shield excavator according to claim (1), wherein a seal ring 3 is provided on the sliding surfaces of the sliding member 2a and the fitting groove 2f to prevent infiltration of earth and sand, groundwater, etc.