JPH03287996A - Gripper device of shield excavator - Google Patents

Abstract

PURPOSE:To obtain sufficient support force by forming a large number of recessed parts to the outer peripheral surface of a shield main body in the circumferencial direction and receiving shoes in the recessed parts in a freely protruding and retracting manner to bring the same into contact with the wall of a pit under pressure by a drive means. CONSTITUTION:A face is excavated by the cutter head provided to the leading end of a shield main body 1. When reaction force is supported, oil pressure is supplied into the cylinders 5 provided to respective gripper devices through pipes 6 to extend the cylinders 5. Further, the respective shoes 3a supported on a support shaft 7 are allowed to protrude from recessed parts 1b toward the main body 1 and the earth surfaces of the shoes 3a are brought into contact with the inner surface of a pit wall under pressure and propelling reaction force and the excavating reaction force in a rotary direction are supported by the pit wall through the shoes 3a.

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention is aimed at reducing the propulsion reaction force of the shield body for excavating underground,
The present invention relates to a gripper device for an excavator that supports the excavation reaction force of a cutter head provided at the front of a shield body.

(Conventional technology) Conventional shield excavators that excavate tunnels underground use the propulsion reaction force when propelling the shield body underground, and the cutter head rotatably installed at the front of the shield body. There is a gripper device in which the reaction force during excavation is supported by a gripper device with a shoe pressed against the shaft wall.

Furthermore, as shown in FIG. 4, the above-mentioned gripper device is provided with shoes C at the tip of a guide rod provided in a direction perpendicular to the direction of propulsion of the shield body a, and these shoes C are connected to the shield body by a gripper cylinder d. The shoe C protrudes from both sides of the shaft a toward the shaft wall, and the shoe C is pressed against the shaft wall, or as shown in FIG. The lower end of the shoe C is expanded by a gripper cylinder d, so that the shoe C is pressed against the shaft wall.

(Problem to be Solved by the Invention) However, in the conventional gripper device, when the stratum excavated by the shield body a becomes a soft rock zone or an unconsolidated layer, even if the shoe C is pressed against the shaft wall.

Shoe C sinks into the ground and does not provide sufficient ground pressure.
As a result, there was a problem that the propulsion reaction force and excavation reaction force could not be supported.

The present invention has been made in order to improve the above-mentioned problems, and it is an object of the present invention to provide a gripper device for a shield tunneling machine that can provide sufficient support even in soft ground zones.

(Means and effects for solving the problem) In order to achieve the above object, the present invention provides a shield excavator that excavates with a cutter head rotatably provided at the front of the shield body while propelling the shield body. , a large number of recesses are formed in the outer peripheral surface of the shield main body in a circumferential direction, and shoes are housed in these recesses so that the ground plane can freely protrude and retract from the outer peripheral surface of the shield main body, and each of the shoes is driven by a driving means to the shaft wall. By crimping it to the shield, the propulsive reaction force when the shield body is propelled.

It is designed to support the excavation reaction force caused by the cutter head.

As a result, even if the shield body plunges into a soft rock zone or unconsolidated layer, the numerous shoes provided on the outer circumferential surface of the shield body press against the mine wall over a wide area, providing sufficient support force. It becomes like this.

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

In the figure, 1 is the shield body, and 2 is the cutter head installed at the front of the shield body.

It is rotated by a cutter head motor (not shown). Reference numeral 3 denotes a gripper device provided on the outer periphery of the shield main body 1 at approximately the middle portion thereof.

They are provided in multiple rows in the circumferential direction of the shield body 1.

In the gripper assembly W3, a shoe 3a is housed in a longitudinally elongated elliptical recess 2b opened in the skin plate 1a of the shield body 1 so as to be freely retractable. Said recess 1
b is as many shoes 3 as possible on the outer periphery of the shield body l.
They are formed at narrow intervals to allow the shield body 1 to be attached, and a plurality of rows are also provided in the front and rear directions of the shield body 1.

Furthermore, a loose spherical ground surface 3e is formed on the outer surface of each shoe 3a, and a cylindrical portion 3b continuous with this ground surface @3e.
is fitted into the recess 1b, and the cylindrical portion 3b
A protrusion 3c is provided on the outer circumferential surface of the recess 1b to slide over the entire circumference.

Furthermore, seals 4 are provided on the inner circumferential surface of the recess 1b, the top of which is pressed against the outer circumferential surface of the cylindrical portion 3b0. It is designed to prevent dirt and sand from entering.

On the other hand, the depth of the recess 1b formed on the outer periphery of the shield body 1 is relatively shallow so as not to reduce the effective inner diameter of the shield body 1, and an elastic material such as rubber is inserted into the recess 1b. A bellows-shaped cylinder 5 formed by
is accommodated.

One end of the cylinder 5 is fixed to the shield body 1 side, and the other end is fixed to the shoe 3 side.
It is expandable and retractable in the radial direction, and hydraulic pressure can be supplied into the cylinder 5 from the inside of the shield body 1 via a conduit 6.

A support shaft 7 is supported at the center of the recess 1b so as to be slidable in the radial direction of the shield body 1, and a spherical portion 7a formed at the tip of the support shaft 7 is attached to the inner center of each shoe 3. A portion 3d of the provided ball holder is rotatably supported.

Next, to explain the operation, the shield body 1 is propelled underground by a shield jack (not shown), and the shield body l
The face in front of the shield body 1 is excavated by the cutter head 2 installed at the tip of the cutter 7. The propulsive reaction force when the shield body 1 is propelled and the excavation reaction force in the rotational direction when the cutter 2 excavates are transferred to the gripper device 3. Supported by

That is, when supporting the reaction force, hydraulic pressure is supplied into the cylinder 5 provided in each gripper device 3 to cause the cylinder 5 to extend.

As a result, each shoe 3 is projected outward from the shield body 1 from inside the recess 1b, and the ground surface of the shoe 3 is pressed against the inner surface of the shaft wall, so that the propulsive reaction force and the excavation reaction force in the rotational direction are absorbed by these shoes. It comes to be supported by the pit wall through 3.

In addition, even if the shield body 1 plunges into soft rock or unconsolidated layers, the shoes 3 provided around the entire circumference of the shield body 1 compress the ground over a wide area, so the shoes 3 will not sink into the ground. This makes it possible to reliably support the propulsion reaction force and excavation reaction force.

In addition, since the area around the retractable shoe 3 is sealed off by the seal 4, water and dirt will not enter into the gap between the recess 1b and the shoe 3. It can also be applied to

(Effects of the Invention) As described in detail above, this invention provides shoes around the entire circumference of the shield body and presses these shoes against the mine wall, thereby reducing the propulsion reaction force during propulsion of the shield body and the cutter head excavation. Since the shoe supports the excavation reaction force during excavation, even if the propulsion stratum enters a soft rock zone or unconsolidated layer, the shoe will come into contact with the tunnel wall over a wide area, so the shoe will not sink into the ground. Problems such as not being able to obtain a predetermined ground pressure can be resolved.

This makes it possible to sufficiently support the propulsion reaction force and excavation reaction force, making it possible to excavate efficiently even in soft rock zones, and by making the recess that accommodates the shield shallower, the effective inner diameter of the shield body can be reduced. Since it does not decrease in size, there are no restrictions on the equipment that can be installed within the Nord body.

In addition, since the entire structure can be made compact, by increasing the number of shoes, it can be easily installed in a small-diameter shield excavator.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which FIG. 1 is a side view of the shield body, FIG. 2 is a sectional view taken along the line nn in FIG. 1, FIG. 3 is an enlarged sectional view of the gripper device, and FIG. FIG. 5 and FIG. 5 are explanatory diagrams of a conventional grinding device. 1...Shield body 1b...Concavity 2...Cutter head 3a...Shoe 3e...Ground surface
4...Seal 5...Cylinder

Claims (3)

[Claims] (1) While propelling the shield body 1, the shield body 1
In a shield excavator that excavates with a cutter head 2 rotatably provided at the front part of the shield body 1, a large number of recesses 1b are formed in the circumferential direction on the outer peripheral surface of the shield body 1, and a ground plane 3e is formed in these recesses 1b. accommodates the shoes 3a such that they can freely protrude and retract from the outer peripheral surface of the shield body 1, and each of the shoes 3a
A gripper device for a shield excavator, which is configured to support the propulsion reaction force during propulsion of the shield body 1 and the excavation reaction force by the cutter head 2 by pressing the shield body 1 against the shaft wall using a driving means. (2) Each shoe 3a is formed in an elongated elliptical shape in the direction of propulsion of the shield body 1, and a water-stopping seal 4 is interposed between the inner circumferential surface of the recess 1b on the outer circumferential surface of the shoe 3a. Gripper device as described. (3) The gripper device according to claim 1, wherein the means for driving the shoe 3a is constituted by a bellows-shaped cylinder 5 made of an elastic body, and the cylinder 5 is expanded and contracted by supplying hydraulic pressure into the cylinder 5.