JPH0455596A - Shield excavator - Google Patents

Abstract

PURPOSE:To raise the efficiency of excavation by a method in which a fit part having a spherical slide part and a fit groove for it is provided to connect front and back shield machines by articular mechanisms provided on several stages in a freely bendable manner. CONSTITUTION:The front and back shields 1a and 1b of a shield machine l are connected by articulate mechanisms 2 in a freely bendable manner. The articulate mechanism 2 consists of slide parts 2a and fit parts 2b and 2c. The slide part 2a is shaped into an annular plate form, where it is curved with the same curvature radius as a part of spherical face, centering on the center line of the shield machine 1. An opening of a smaller diameter 2d than the inside diameter of the fit parts 2b and 2c is formed in the central part, and the large-diameter end of the final slide part 2a is fixed to the front end of the shield 1b. The area between the front and back shields can thus be bent with great bending angles.

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. 3, conventional shield tunneling machines include 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 is flexible. is publicly known.

The above-mentioned articulated shield excavator can perform curved construction by bending the space between the front shield b and the rear shield C as shown in Figure 4. is the two spherical sealing surface d
An articulating mechanism e 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 etc. to prevent the mating part from coming off when the space between the 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 Fig. 5, 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 is something to do.

(Means and Effects for Solving the Problems) In order to achieve the above object, the present invention has a shield main body which is divided into a plurality of front shields and rear shields, and has two spherical surfaces between the front shield and the rear shield. The formed sliding member and a fitting member having a fitting groove into which the sliding member is slidably fitted are refractably connected by an articulate mechanism provided in multiple stages.

This allows bending between the sliding member and the fitting member provided in multiple stages between the front and rear shields, making it possible to obtain a large center bending angle without reducing the effective inner diameter within the shield body.

(Example) An example of the present invention will be described in detail with reference to the drawings shown in FIGS. 1 and 2.

In Fig. 1, 1 is the shield main body, and the front shield 1a
and a rear shield 1b, and these front and rear shields la, lb are connected by an articulating mechanism 2 so as to be bendable.

As shown in FIG. 1, the articulate mechanism 2 is composed of a plurality of sliding members 2a and the same number of fitting members 2b and 2c.

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.

The large diameter end of the sliding member 2a located at the rearmost position is fixed to the front end of the rear shield 1b.

Furthermore, the fitting members 2b and 2c have a structure in which an annular body is divided into two parts in the front and back, and the fitting member 2b and 2c is located between each fitting member 2b and 2c.

A spherical fitting groove 2d is formed into which the small diameter end side of the sliding member 2a is slidably fitted, and each fitting member 2b, 2
The space between c is fixed by a fixing member 4.

A sliding member 2a fixed to the rear shield 1b is placed in the fitting groove 2d of the fitting members 2b and 2C located at the rearmost position.
are mated together.

A large diameter end of a sliding member 2a located on the front side is fixed to the front surface of the fitting members 2b, 2c.

Thereafter, the sliding members 2a and the fitting members 2b2C are arranged alternately in the same manner, and the fitting member 2b located at the frontmost side,
2c is fixed to the rear end of the front shield 1a, and 3 each sliding member 2a and fitting member 2b are fixed to the rear end of the front shield body 1.
, 2c, it is bent like a bellows.

Note that 5 in the figure is a seal ring provided between the sliding surface of the sliding member 2a and the fitting groove 2d, and is designed to prevent dirt and groundwater from entering into the shield body 1.

Next, to explain the operation, when performing straight line construction using the shield body 1, hold the front and rear shields la and lbO with articulated jacks so that the centers of the front and rear shields 1a and 1b are in a straight line, and in this state, the shield The shield body 1 is propelled into the ground by a jack (both not shown), and the cutter head IC installed at the front of the shield body 1 excavates the face while excavating the earth and sand excavated by the cutter head IC. is taken into the shield body 1 and then discharged by an unillustrated earth removal device.

In addition, when performing curved construction, the space between the front and rear shields la and lb is bent using an articulated jack.

As a result, the sliding member 2a and the fitting member 2b of the articulate mechanism 2 connect the front and rear shields la and lbO.
, 2c slide around the center point of the spherical surface and bend as shown in Figure 1. Therefore, construction along extremely sharp curves can be easily carried out, and it can be bent at a large center bend angle. Since the sliding member 2a does not come out of the fitting groove 2d, there is no need to provide a mechanism to prevent the sliding member 2a from coming out.

(Effects of the Invention) As detailed above, the present invention includes a sliding member formed into a spherical surface between two front and rear shields, and a plurality of fitting members each having a fitting groove into which the sliding member is slidably fitted. Since they are connected by the articulate mechanism provided over the stages, it is possible to bend the space between the front and rear shields at a large bending angle.

This allows construction not only along sharp curves but also extremely sharp curves, and reduces the amount of excess excavation when constructing two curves, thereby greatly improving excavation efficiency.

In addition, even if the shield is bent at a large bending angle, the effective diameter inside the shield body will not be reduced, and the sliding member will not come off when it is bent, so there is no need for a mechanism to prevent it from coming off like in the past. This makes it possible to simplify and downsize the structure of the articulating mechanism.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a shield tunneling machine according to an embodiment of the present invention, FIG. 2 is an enlarged view of the area in the circle in FIG. 1... Shield body. 1a...Front shield. 1b... Rear shield 2... Articulating mechanism. 2a...Sliding members 2b, 2c...Fitting members.

Claims (1)

[Claims] A sliding member 2a formed in a spherical shape slides between the front shield 1a and the rear shield 1b of the shield main body 1 which is divided into a plurality of front shields 1a and rear shields 1b. A shield excavator in which fitting members 2b and 2c having fitting grooves 2d that can be fitted freely are connected in a flexible manner by an articulate mechanism 2 provided in multiple stages.