JPH11311091A - Tunnel excavator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To positively press a grip shoe to a pit wall surface of a tunnel by making the grip shoe follow the pit wall surface of the tunnel, and energizing the grip shoe around a convex spherical surface parallel to a tunnel excavating direction by the resilience of a disc spring. SOLUTION: Connecting mechanism 5 for connecting a grip jack 3 and a grip shoe 4 to each other is provided with a spherical bearing part 13 and disc spring structure 14 provided in the outer peripheral position of the spherical bearing 13. Accordingly, even in the case of a grip body 2 being dislocated, the grip shoe 4 is rotated around the spherical bearing 13 and pressed to a pit wall surface 56 in such a way as to follow it by the disc spring structure 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a tunnel excavator.

[0002]

2. Description of the Related Art A conventional tunnel excavator is shown in FIGS. The tunnel excavator 50 includes an excavator body 50.
A cutter head 51 for excavating the ground mounted on A;
A driving unit 52 for rotatably supporting and driving the cutter head 51 on the excavator body 50A;
2, a beam 53 extending rearward, a grip device 54 attached to the rear of the beam 53, and a drive unit 52 and a cutter head with the grip shoe 55 of the grip device 54 pressed against a pit wall 56. Thrust jack 57 for advancing 51 with beam 53
And

As shown in FIG. 5, the grip device 54 includes a grip body 59 through which the beam 53 is slidably inserted, and a grip jack 58 mounted on both sides of the grip body 59 and at a vertical position. And the grip shoe 55 attached via a pin member disposed over the distal ends of the upper and lower grip jacks 58 and in parallel with the tunnel excavation direction.

In this tunnel excavator 50, a grip jack 58 is driven to move a grip shoe 55 to a pit wall 56.
, The drive unit 52 is driven to rotate the cutter head 51 in a state where the propulsion reaction force of the excavator body 50A is secured, the thrust jack 57 is extended, and the excavator body 50A (cutter head 51) is moved together with the beam 53. Go ahead and excavate the tunnel.

[0005]

In the conventional grip device 54 of the tunnel excavator 50, a grip shoe 55 is provided.
Is mounted on the grip jack 58 via a pin member arranged in parallel with the tunnel excavation direction, over the distal end of the grip jack 58 mounted on the upper and lower positions on both side surfaces of the grip body 59, so that the degree of freedom is increased. poor.

However, in the tunnel excavator 50, the grip shoe 55 is pressed against the pit wall 56 to secure the propulsion reaction force of the excavator body 50A.
It is necessary that the grip shoes 55 follow the curved surface of the pit wall 56.

Accordingly, in the above-described conventional tunnel excavator 50, when the grip body 59 is displaced, the grip shoe 55 cannot follow the curved surface of the pit wall 56, and the excavator body 50 does not move.
There were cases where the propulsion reaction force of A could not be secured.

Therefore, an object of the present invention is to provide a tunnel excavator capable of solving the above-mentioned problems.

[0009]

According to the present invention, there is provided a drive unit for rotatably supporting and driving a cutter head for excavating a ground mounted on an excavator body. A beam is stretched rearward from the part, and a grip device for positioning the rear part of the beam with respect to the pit wall is provided. A forward jack is driven while being positioned with respect to the pit wall so that the drive unit and the cutter head are advanced together with the beam, and a grip extending in a radial direction of a tunnel on a side of a grip device body of the grip device. A jack is provided, and the tip of the grip jack and the grip shoe are connected via a connecting mechanism. A spherical bearing portion comprising a convex spherical surface provided on one of the jack side or the grip shoe side and a concave spherical surface provided on the other of the grip jack side or the grip shoe side and slidably fitted to the convex spherical surface; A plate provided between the mounting member on the grip jack side and the mounting member on the grip shoe side at an outer peripheral position of the spherical bearing portion to bias the grip shoe around the spherical bearing portion in a direction parallel to the tunnel excavation direction. And a spring.

In the above configuration, if the grip device body is misaligned, when the grip jack is extended,
Either the upper end or the lower end of the grip shoe contacts the tunnel wall first, and when the grip jack is further extended, the convex spherical surface slides on the concave spherical surface of the spherical bearing, and the grip shoe moves around the convex spherical surface. The lip shoe follows the tunnel wall surface while rotating, and the elastic force of the disc spring urges the grip shoe around the convex spherical surface in a direction parallel to the tunnel excavation direction, causing the grip shoe to pierce the tunnel wall surface. Press firmly.

[0011]

FIG. 1 is a block diagram showing an embodiment of the present invention.
This will be described with reference to FIG. 4 and FIG. 5 is different from the conventional tunnel excavator 50 in the configuration of the grip device 54, and the other configuration is the same as that of the tunnel excavator 50 described above. Omitted.

A grip device 1 of a tunnel excavator 50 according to an embodiment of the present invention has a base body fixed to both sides (only one side is shown in the figure) of a grip body (grip device main body) 2 and a tunnel. The grip jacks 3 extending in the radial direction A are provided, and each of the grip jacks 3 is connected to the grip shoe 4 which is in contact with the tunnel wall 56 of the tunnel T via a connection mechanism 5.

The connecting mechanism 5 includes a spherical bearing 13 and
A disc spring structure 14 provided at an outer peripheral position of the spherical bearing portion 13, wherein the spherical bearing portion 13 has a convex spherical surface 7 formed at the tip of the horizontal extension portion 6 of the grip jack 3;
And a receiving member 11 fixed to the pressed member 8 on the back side of the grip shoe 4 by a bolt 10, and a concave spherical surface 1 provided on the receiving member 11 and slidably fitted to the convex spherical surface 7.
2a.

The disc spring structure 14 includes the receiving member 11.
A support member 16 attached to the stepped portion 11a of the support member 16 via a rib 15, an abutted plate 18 attached to the support member 16 via a bolt 17, and a rib 20 on a side portion of the horizontal extension portion 6 via a rib 20. A shaft insertion plate 21 to be attached, a contact member 23 having a curved surface 23 a formed at a tip end of a shaft bolt 22 inserted into the shaft insertion plate 21 and abutting against the contacted plate 18, and a shaft bolt 22. It is composed of a disc spring 24 that is fitted outside and is disposed between the shaft insertion plate 21 and the contact member 23. The disc spring 24 biases the grip shoe 4 around the convex spherical surface 7 of the spherical bearing portion 13 in a direction parallel to the tunnel excavation direction.

Reference numeral 25 denotes a dust seal member provided between the cylinder portion 26 of the grip jack 3 and the horizontal extension portion 6, and reference numeral 27 denotes a convex spherical pressing member attached to the receiving member 11 via bolts 28.

In the above configuration, when excavating the ground G, the grip jack 3 is extended, the grip shoe 4 is pressed against the pit wall surface 56, the grip body 2 is positioned at the center in the tunnel T, and the driving section 52 is moved. Drive to rotate the cutter head 51, extend the thrust jack 57,
The excavator body 50A (cutter head 51) is advanced with the beam 53 to excavate the ground G.

After excavating a predetermined distance, the front support F is driven to fix the grip body 2 to the side of the pit wall 56, and the rear support R is driven to support the rear end of the beam 53. Then, the grip jack 3 is contracted, and the thrust jack 57 is contracted. In this manner, the entire grip device 1 is moved forward along the beam 53. When the entire grip device 1 moves to a predetermined position, the grip jack 3 is extended again to press the grip shoe 4 against the pit wall surface 56 to position the grip body 2 at the center in the tunnel T, and the drive unit 52 Is driven to rotate the cutter head 51, extend the thrust jack 57, and advance the excavator body 50A together with the beam 53. By repeating such an operation,
Excavation work on the ground G is performed.

The rotation torque generated by the rotation of the cutter head 51 acts on the grip device 1 via the beam 53. For this reason, during excavation of the ground G, the grip body 2 (the entire grip device 1) may rotate around the central axis of the tunnel T and may be displaced from a predetermined position.
In some cases, the grip body 2 may be
May be displaced in the radial direction (vertical direction) perpendicular to.

As described above, when the grip jack 3 is extended when the grip body 2 is displaced, the upper end or the lower end of the grip shoe 4 comes into contact with the pit wall 56 first depending on how the grip device 1 is displaced. However, since the grip jack 3 and the grip shoe 4 are connected via the spherical bearing portion 13, even if the upper end or the lower end of the grip shoe 4 first hits the pit wall surface 56, the concave surface of the concave spherical seat 12 is formed. The grip shoe 4 rotates around the convex spherical surface 7 by sliding on the convex spherical surface 7 on the spherical surface 12a (for example, indicated by a virtual line).
In addition, the grip shoe 4 is urged around the convex spherical surface 7 in a direction parallel to the excavation direction of the tunnel T by the elastic force of the disk spring 24 of the disk spring structure 14, and follows the pit wall surface 56,
The pressing force of the grip jack 3 causes the grip shoe 4
Presses down on the pit wall 56 to securely hold the grip body 2.

As described above, according to the embodiment of the present invention, since the grip jack 3 and the grip shoe 4 are connected via the spherical bearing 13 and the disc spring structure 14, the grip shoe 4 is This is a case in which the grip jack 4 is extended in a state where the grip shoe 4 is displaced in a state in which the degree of freedom of the grip shoe 4 is increased by being urged around the convex spherical surface 7 of the spherical bearing portion 13 in a direction parallel to the excavation direction. However, the grip shoe 4 can be made to follow the pit wall surface 56, and the pressing force of the grip jack 3 causes the grip shoe 4 to press the pit wall surface 56, so that the grip body 2 can be reliably held. .

[0021]

As is apparent from the above description, the present invention is provided with a grip jack extending in the radial direction of the tunnel on the side of the grip device body of the grip device. Are connected via a connecting mechanism, and the connecting mechanism slides on the convex spherical surface provided on one of the grip jack side or the grip shoe side and the convex spherical surface provided on the other of the grip jack side or the grip shoe side. A spherical bearing portion formed of a concave spherical surface that fits freely, and is provided between a mounting member on the grip jack side and a mounting member on the grip shoe side at an outer peripheral position of the spherical bearing portion. The grip device body was displaced because it was provided with a disc spring that urged around the spherical bearing in a direction parallel to the direction. When the grip jack is extended, either the upper end or the lower end of the grip shoe contacts the tunnel wall first, and when the grip jack is further extended, the convex sphere slides on the concave spherical surface of the spherical bearing. As the grip shoe rotates around the convex spherical surface, the lip shoe can follow the tunnel wall surface, and the elastic force of the disc spring allows the grip shoe to rotate around the convex spherical surface in a direction parallel to the tunnel excavation direction. Because it is urged to
The grip shoe can reliably press the tunnel against the tunnel wall.

[Brief description of the drawings]

FIG. 1 is a front sectional view showing an entire configuration of a grip device in a tunnel excavator showing an embodiment of the present invention.

FIG. 2 is an enlarged front sectional view of the same.

FIG. 3 is a view in the direction of arrows XX in FIG. 1;

FIG. 4 is a side sectional view commonly used for the present invention and the prior art.

FIG. 5 is a detailed sectional view of a conventional grip device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Grip device 2 Grip body 3 Grip jack 4 Grip shoe 7 Convex spherical surface 12 Concave spherical seat 12a Concave spherical surface 13 Spherical bearing part 14 Disc spring structure 24 Disc spring G Guchiyama T Tunnel

Claims (1)

[Claims] 1. A driving unit for rotatably supporting and driving a cutter head for ground excavation attached to an excavator body is provided, and a beam is stretched rearward from the driving unit. A grip device for positioning the rear portion of the beam with respect to the pit wall is provided. A tunnel excavator that drives the cutter and the cutter head forward with the beam, wherein a grip jack extending in a radial direction of the tunnel is provided on a side of a grip device body of the grip device, The tip of the grip jack and the grip shoe are connected via a connecting mechanism, and the connecting mechanism is connected to the grip jack or the grip. A spherical bearing portion comprising a convex spherical surface provided on one of the lip shoe sides, a concave spherical surface provided on the grip jack side or the other of the grip shoe side and slidably fitted to the convex spherical surface, and the spherical bearing portion; A disc spring provided between the mounting member on the grip jack side and the mounting member on the grip shoe at the outer peripheral position of the spring to bias the grip shoe around the spherical bearing in a direction parallel to the tunnel excavation direction. A tunnel excavator, comprising: