JPH0739993Y2 - Center-break type shield excavator - Google Patents

Description

[Detailed Description of the Invention] (Industrial field of application) The present invention relates to an improvement of a center-break type shield excavator suitable for excavating a tunnel with a sharp bend.

(Prior Art) Conventionally, as this type of intermediate folding shield excavator, for example, as described in Japanese Utility Model Publication No. 57-56886,
The tubular shield body is divided into a front body part and a rear body part, and the rear end of the front body part and the front end of the rear body part are separated from each other by a centering pin arranged at an interval of 180 degrees in the circumferential direction. It has a structure in which it is flexibly connected and the front body and the rear body are connected by several middle-folding jacks. The front body portion is bent at a desired angle with respect to the body portion, and the rear body portion is propelled to advance the front body portion together with the rear body portion in a predetermined direction.

(Problems to be solved by the invention) However, according to such a structure, when the rear end portion of the rear trunk portion receives a reaction force to the front end surface of the segment lining and is propelled by the propulsion jack, the propulsion force is moderate. Since a large load is directly transmitted to the front body portion via the bending pin and acts on the intermediate bending pin in the shearing direction, and the pin may be broken, the pin diameter must be increased.

Similarly, if rolling occurs in the front body due to the rotating force of the cutter plate, etc., the rolling reaction force is also applied to the center folding pin because the rolling reaction force is received by the rear body via the center bending pin. In addition to the need for a large-diameter center-breaking pin, the structure is complicated, and the diameter of the center-breaking pin is also limited so that the front body part and the rear body part can be bent. There was a point.

An object of the present invention is to provide a center-breakable shield excavator capable of solving such problems.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the center-folding shield excavator of the present invention has a tubular shield body having an excavating cutter disposed in the front body portion as a front body portion. It is divided into a rear torso part, a front end of the rear torso part is flexibly joined to the rear end of the front torso part, and a bending actuation means such as a middle-bending jack for refracting the front and rear torso parts is provided. In a center-breaking shield excavator, a front end face is integrally fixed to a rear body part with a pressing member formed in an arcuate surface centered on a bending point, and the front body part slides on the arcuate surface of the pressing member. It has a structure in which a pressure receiving member having an arcuate surface for freely receiving is fixed.

(Operation) When a bending actuating means such as a middle-folded jack disposed between the front and rear body portions is driven, the pressure receiving member fixed to the front body portion is fixed to the rear body portion and the front end arc surface of the pressing member is fixed. While sliding the rear end arc surface, the front body bends at a predetermined angle with respect to the rear body.

Further, when the rear trunk is pushed forward by the propelling jack, the propulsive force is received from the pressing member fixed to the rear trunk to the pressure receiving member abutting against the pressing member, and these pressing,
The front and rear body parts are integrally propelled by being transmitted to the front body part via a pressure receiving member.

Further, when rolling occurs in the front body due to the rotational force of the cutter plate, the rolling reaction force is transferred to the rear end surface of the pressure receiving member through the rear end surface of the pressure receiving member which is curved in an arc shape in the rolling direction. The front end of the contacting pressing member receives the arcuate surface, and rolling is blocked by the rear body portion to which the pressing member is fixed.

Therefore, it is possible to bend the front and rear body portions of the shield excavator, reliably transmit the propulsive force to the front body portion, receive the rolling reaction force, and the like without necessarily using the center bending pin.

(Embodiment) Next, an embodiment of the present invention will be described with reference to the drawings. In FIGS. 1 and 2, (1) is a cylindrical shield body,
This shield body (1) has a front body (1a) in which a cutter plate (2) for excavation is arranged at the front end opening, and a rear body in which propulsion jacks (3) are attached at several points in the rear end. Department (1
It is divided into 2) and b).

Further, the inner peripheral surface of the rear end of the front body portion (1a) is formed as a concave arc-shaped ball seating surface (4), and the inner surface of the rear end portion close to the spherical seating surface (4) has a circumferential direction. A plate-shaped or block-shaped pressure-receiving member (5) having an appropriate thickness as shown in FIGS.
(5) is integrally fixed by welding or the like, and the rear end faces of these pressure receiving members (5) and (5) are centered on a center point O on a vertical plane passing through the center of the ball seating face. It is formed in a concave arc-shaped arc surface (6) in the circumferential direction of 1a).

On the other hand, on the inner peripheral surface of the front end portion of the rear body portion (1b), a short cylindrical joint ring body (8) is formed, the outer peripheral surface of which is formed into a convex arc-shaped spherical surface (7) which is in sliding contact with the spherical seat surface (4). The outer peripheral surface of the rear end is integrally fixed, and further, plate-like pressing members (9) and (9) face the pressure receiving members (5) and (5) in the front-rear direction, and the joining ring body (8). Are integrally fixed to the inner peripheral surface of the pressing member by welding or the like, and the front end faces of these pressing members (9) (9) are connected to the pressure receiving member (5)
The arcuate surface (6) is formed on a convex arcuate arcuate surface (10) having the same curvature, and both arcuate surfaces (6) and (10) are slidably abutted in a surface contact state.

(11) is a center-folding jack arranged on all four sides of the inner peripheral surface of the front and rear body parts (1a) and (1b) joined flexibly.
Connect one of the cylinder and rod tip to the front body (1
In a), the other is connected to the rear trunk (1b).

(12) is a rotation driving means for the cutter plate (2), which is rotatably supported by a partition wall (13) provided inside the front end of the front body portion (1a) of the shield body (1). The central axis (14) is driven to rotate.

With this configuration, when excavating a tunnel portion that bends in the left-right direction during tunnel excavation, first, the pressing members (9) (9) arranged on the upper and lower sides by actuating the four-way center-folded jacks (11). Centered on the axis between, the front trunk (1a)
Is refracted in a predetermined direction with respect to the rear body part (1b). At this time, the concave arcuate spherical seat surface (4) of the front torso (1a) and the rear torso (1b)
The front body portion (1a) is bent while sliding on the convex arcuate spherical surface (7) of the front body portion (1a), and the pressure receiving member (5) fixed to the rear end of the front body portion (1a) is formed into a rear end concave arcuate arc. The surface (6) is rotated in the left-right direction while slidingly contacting the front end concave arcuate arc surface (10) of the pressing member (9) fixed to the joint ring body (8) of the rear body portion (1b).

In this way, when the propelling jack (3) is extended after being bent by a predetermined angle, the propelling jack (3) is rearward while the segment lining (not shown) of the already built tunnel receives the reaction force. Propel the trunk (1b) forward.

This propulsive force is in contact with the arc surface (10) through the front end arc surface (10) of the pressing member (9) integrally fixed to the rear body portion (1b). Transmitted to (5),
Therefore, the front body portion (1a) provided with this pressure receiving member (5)
Is to be integrated with the rear torso (1b).

Further, when an action force for rolling on the front body portion (1a) is generated by the rotation of the cutter plate (2), the circular arc surface (6) of the pressure receiving member (5) integrated with the front body portion (1a) is It is received by the arcuate surface (10) of the pressing member (9) in a locked state, and rolling is blocked by the rear body portion (1b) provided with this pressing member (9).

The pressure receiving member (5) and the pressing member (9) are connected to the front and rear body parts (1
a) When located on the refraction part side of (1b), the contact surface between the pressure receiving member (5) and the pressing member (9) has a thickness of the pressure receiving member (5) centered on the spherical seat surface (4). Since they move in the same direction, the concavo-convex arc surfaces (6) that come into contact with each other during the displacement
It is desirable that the front end surface of the pressing member (9) is formed into a curved surface centered on the refraction portion so that the sliding of (10) can be performed smoothly.

Next, FIGS. 5 and 6 show another embodiment of the present invention.
Rolling prevention pin (15) in the structure of the above embodiment
Is attached.

That is, the front end portion of the plate-shaped pin holding member (16) is detachably fixed to the pressure receiving member (5) fixed to the front body portion (1a) by a bolt (21) or the like, and the pin holding member (5 16) A rolling prevention pin (15) protruding toward the center of the ball seating surface (4) is detachably provided at the rear part of the 16), while a pressing member (9) fixed to the rear body part (1b). The pin hole (17) into which the pin (15) is fitted is provided in the pin hole (1
7) is a long hole with a short diameter substantially equal to the diameter of the pin (15), which is long in the front-rear direction, and is bent into the pin hole (17) when bending between the front and rear body parts (1a) (1b). A gap (18) is provided to allow the front and rear movement of (15).

Reference numeral (19) is a planar crescent-shaped distance piece that is interposed in the gap (18) according to the size of the gap (18).

A gap (20) allowing refraction between the front and rear body portions (1a) (1b) is also provided on the opposing surfaces of the pin holding member (16) and the pressing member (9).

With this configuration, when the shield body (1) is advanced, the propulsive force from the rear body portion (1b) side is pushed from the pressing member (9) through the pressure receiving member (5) to the front body portion (1a). However, when rolling occurs, the pin (15) fitted in the pin hole (17) of the pressing member (9) is moved to the inner circumference of the pin hole (17). By reliably contacting and receiving the wall surface, rolling is prevented reliably.

Other structures and operations are the same as those in the above-mentioned embodiment.

In the above embodiment, the rear end circular arc surface (6) of the pressure receiving member (5) has a concave arc shape and the front end circular arc surface (10) of the pressing member (5) has a convex arc shape. Of course, it may be formed.

(Effect of the Invention) As described above, according to the center-bending shield excavator of the present invention, the cylindrical shield body having the excavating cutter at the front end is divided into the front body portion and the rear body portion. At the same time, the front end of the rear trunk portion is flexibly joined to the rear end of the front trunk portion, and a bending actuating means such as a middle folding jack for bending the front and rear trunk portions together is disposed. In, the front end surface is integrally fixed to the rear body part with a pressing member formed in an arcuate surface centered on the refraction point, and the front body part has an arcuate surface slidably receiving the arc surface of the pressing member. Since the pressure receiving member provided with is fixed, the front end arc of the pressure receiving member fixed to the front body portion and the pressing member fixed to the rear body portion at the time of center bending between the front and rear body portions. While making the circular arc surfaces that are in contact with each other slidably contact with each other, smoothly and reliably bend at a predetermined angle In addition, the propulsive force from the rear torso portion side is firmly received from the pressure member fixed to the rear torso portion to the pressure receiving member on the front torso portion contacting the tip end surface of the pressing member. It is possible to configure a propulsion force transmission structure that can be easily and reliably transmitted through these pressing and pressure receiving members while being stopped, and that can be provided for long-term use with a simple structure.

In addition, when the front body portion is rolled due to the rotational force of the cutter plate, the rolling reaction force is curved in an arc shape in the rolling direction through the rear end surface of the pressure receiving member and the rear end surface of the pressure receiving member. The front end arc surface of the pressing member that is in contact with the pressing member can receive the pressing member, and rolling can be prevented without necessarily using the center bending pin as in the related art.

[Brief description of drawings]

The drawings show an embodiment of the present invention. Fig. 1 is a simplified vertical sectional side view, Fig. 2 is a vertical sectional front view thereof, Fig. 3 is an enlarged vertical sectional side view of a refraction portion, and Fig. 4 is a plan view thereof. FIG. 5 is an enlarged vertical side view of a refraction part showing another embodiment of the present invention, and FIG. 6 is a plan view thereof. (1) ... shield body, (1a) ... front body part, (1b) rear body part, (5) ... pressure receiving member, (6) (10) ... arc surface,
(9) …… Pressing member, (11) …… Center folding jack, (1
5) …… Rolling prevention pin, (16) …… Pin holding member, (17) …… Pin hole.

Claims (1)

[Scope of utility model registration request] 1. A tubular shield body having an excavating cutter at the front end is divided into a front body portion and a rear body portion, and
In a middle-breaking-type shield excavator in which the front end of the rear body is flexibly joined to the rear end of the front body, and a refraction actuating means such as a center-folding jack for refracting the front and rear body is provided. A pressing member whose front end surface is formed in an arcuate surface centered on the bending point is integrally fixed to the rear body part, and an arcuate surface is slidably received in the front body part so as to slidably receive the arcuate surface of the pressing member. A center-breakable shield excavator characterized in that a pressure-receiving member is fixed.