JPH0455593A - Shield excavator - Google Patents

Abstract

PURPOSE:To permit the construction of steep curves by a method in which an articulate mechanism to actuate the bending operation of front and back shields is provided to at least one of front and back split shields and between expandibly connected fit parts and the shields. CONSTITUTION:A shield body 1 separated into front and back shields la and 1b is connected with the joint 1c between an outer cylinder 1d and a slidable inner cylinder 1e to enable it to freely bend by an articulate mechanism 2, and thrust jacks 4 whose front and back ends are pivotally attached with the shields la and 1b are provided in the body l. The distance between the shields la and 1b is made expandible by the jacks 4 and grippers 1f and 1g to freely fix the shields la and 1b to the inner wall of tunnel are also provided. The structure of the articulate mechanism can thus be simplified.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an articulated shield excavator that employs a telescopic pink mechanism and is capable of construction along sharp curves.

(Prior Art) A conventional shield excavator for excavating a tunnel has a shield main body a and a front shield b, as shown in FIG. 6 or 7.
and a rear shield C, and these front and rear shields b and c are telescopically fitted through a fitting part d.

In the shield excavator of the above structure, the rear shield C is fixed by the gripper e provided on the rear shield C, and the front shield b is propelled by the thrust jack f to dig, and after digging by the length of the segment, With the front shield b fixed by the gripper g, the rear shield C is advanced by shortening the last jack f, and the above operation is repeated to excavate a tunnel.

In addition, when performing curved construction with the above-mentioned shield excavator, the tunnel is excavated along the curve by repeating the above operation while bending between the front and rear shields b and c using the clearance of the fitting part d. It has become.

(Problems to be Solved by the Invention) In the conventional shield excavator described above, the operation of moving the rear shield C forward after digging the front shield b by one segment length is repeated.

When assembling one segment in one excavation, the length of the fitting part d is equal to the length of one segment.

Therefore, if an attempt is made to bend the space between the front and rear shields b and c using the clearance of the fitting part d, the fitting part d will require a large clearance.

However, if the clearance of the fitting part d is too large, it becomes difficult to seal, so a shield tunneling machine that uses a conventional telescopic pink mechanism cannot obtain a large bending angle, resulting in problems such as the inability to construct sharp curves. there were.

This invention has been made to improve the above-mentioned problems, and aims to provide an articulated shield excavator that employs a telescopic pink mechanism that allows construction on sharp curves.

(Means and effects for solving the problem) In order to achieve the above object, the present invention divides a shield body into a front shield and a rear shield, and has an outer cylinder that slides between the front and rear shields. In a shield excavator in which the front shield and the rear shield are telescopically connected via a fitting part consisting of an inner cylinder, and a thrust jack is provided between the front shield and the rear shield, An articulating mechanism for bending the gap between the front shield and the rear shield is provided at least on one side between the joining part and the rear shield.

As a result, the space between the front shield and the rear shield is extended by the fitting part, and digging is simultaneously performed.

The articulating mechanism allows bending between the front and rear shields, making it easier to construct sharp curves.

(Embodiment) An embodiment of the present invention will be described in detail with reference to FIGS. 1 to 4.

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 1a and IbO are connected via a fitting part 1c, and front and rear shields 1a and 1b are connected before and after the fitting part 1c.
An articulate mechanism 2 is provided that can be bent freely between O's.

The fitting part IC includes an outer cylinder 1d and an inner cylinder 1e slidably provided inside the outer cylinder 1d.The inner cylinder 1 is attached to the rear end of the outer cylinder ld.
A seal 3 is provided in pressure contact with the outer peripheral surface of the outer cylinder 1e to prevent dirt, groundwater, etc. from entering between the outer cylinder 1d and the inner cylinder 1e, and the front end of the outer cylinder 1d is connected to the front articulating mechanism 2. The rear end of the front shield 1a is connected to the rear end of the front shield 1a, and the rear end of the inner cylinder 1e is connected to the front end of the rear shield 1b through a rear articulation mechanism 2, respectively.

In addition, a plurality of thrust jacks 4 are provided in the shield body 1, and the front and rear ends of the thrust jacks 4 are respectively pivotally connected to the front shield 1a and the rear shield 1b. The front and rear shields 1a and 1b are extendable and retractable, and the front and rear shields 1a and 1b protrude and retract from the outer peripheral surface, and the front shield 1a is attached to the inner wall of the tunnel.
and a gripper 1f that alternately fixes the rear shield 1b,
1g is provided.

On the other hand, as shown in FIGS. 2 and 3, the articulate mechanism 2 includes a sliding member 2a provided at the rear end of the front shield 1a, and a pair of sliding members 2a that sandwich the sliding member 2a from the front and back directions. It consists of fitting members 2b and 2c.

The sliding member 2a is formed of a disk, and is curved to have a spherical surface having the same curvature as a part of a spherical surface centered on the center point 0 provided on the center line of the shield body 1, and A circular hole 2d having a slightly smaller diameter than the inner diameter of the fitting members 2b and 2c is opened in the center.

A cylindrical portion 1c protruding from the rear end of the front shield 1a and the rear end of the inner cylinder 1e of the fitting portion 1c is connected to the inner circumferential portion of the circular hole 2d. The sliding member 2a is attached to the front shield 1a side and the inner cylinder 1e, and an annular groove 2e is formed on the outer peripheral surface of the sliding member 2a, and a seal ring is installed in the annular groove 2e. 6 is accommodated.

Further, the fitting members 2b and 2c that sandwich the sliding member 2a from the front and rear directions are each formed in an annular shape, and the rear fitting member 2c is the front part of the outer cylinder 1d and the rear shield 1 of the fitting part 1c.
These fitting members 2 are fixed to the front ends of b.
A front fitting member 2b is attached to the front surface of c by a fixing member 7.

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 2r 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 2a1 slide on the inner surface of the fitting groove 2f. The fitting groove 2f is adapted to be moved by the rear shield 1b.
On the other hand, even if the front shield 1a is bent at a large center bending angle, the tip of the sliding member 2a is formed in advance to a length that will not interfere with the tip.

A seal ring 6 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 performing straight line construction using the shield body 1, the front shield 1a and the rear shield 1b are held in a straight line as shown in the embodiment of FIG. The shield 1b is fixed to the inner wall of the tunnel, and in this state, each thrust jack 4 is extended by the same amount to propel the front shield 1a.
The face is excavated by a canterhead lh provided in front of a.

The earth and sand excavated by the canter head 1h is taken into the shield body 1 and then carried out to the rear by an earth removal device (not shown), and when the front shield 1a has dug the length of one segment, the front shield 1a The front shield 1a is fixed with the gripper 1f provided at the rear shield 1b, and the gripper 1g of the rear shield 1b is released.

In this state, the thrust jack 4 is shortened to move the rear shield 1b forward, and the above-mentioned operation is repeated to perform linear excavation of the tunnel.

On the other hand, when performing curve construction along a sharp curve, the rear shield 1
When the front shield 1a is propelled by the thrust jack 4 with the front shield 1a fixed with the gripper 1g, the thrust jack 4 located on the inside of the sharp curve is small, and the thrust jack 4 located on the outside expands greatly. .

As a result, the front shield 1a is propelled, and at the same time, the articulating mechanism 2 provided before and after the fitting part 1c moves the fourth As shown in the figure, sliding member 2
Since it is refracted around the center point 0 of the spherical surface of a, it becomes possible to excavate along a sharp curve.

Also, when the canterhead 1h provided at the front of the front shield 1a excavates the face while rotating, the front shield 1a
The excavation torque reaction force acting on the rear shield 1b is transmitted to the rear shield 1b via the thrust jack 4. However, the thrust jack 4 is previously inserted between the front shield 1a and the rear shield 1b as shown in FIG. By arranging it in a square shape, it is possible to prevent the front shield 1a from rolling due to the reaction force of the excavation torque.

(Effects of the Invention) As described in detail above, the present invention is characterized in that an articulating mechanism is provided before and after the fitting portion that extends and contracts between the front shield and the rear shield.

It becomes possible to bend the beam between the front shield and the rear shield with a large bending angle.

This makes it possible to construct sharp curves using a shield excavator that uses a telescopic structure, which was previously difficult, and eliminates the need to provide a large clearance between the inner and outer cylinders of the three-fitting section. can be easily and reliably sealed.

In addition, since the thrust jack that expands and contracts between the front and rear shields allows bending between the front and rear shields,
The articulate jaws used in conventional articulated shield tunneling machines are no longer required, and the articulating mechanism can be simplified.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a shield tunneling machine showing an embodiment of the present invention, FIG. 2 is an enlarged sectional view of an articulating mechanism,
FIG. 3 is an exploded perspective view, FIG. 4 is an explanatory diagram of the operation, FIG. 5 is a layout diagram of a thrust jack, and FIGS. 6 and 7 are explanatory diagrams showing a conventional shield excavator. 1...Shield body, 1a...Front shield 1b...Rear shield, 1c...Fitting part 1
d...Outer cylinder, le...Inner cylinder 2...
Articulating mechanism. 2a...Sliding member. 2b, 2c... Fitting member 2 2f... Fitting groove. 4...Thrust Jafuki Patent Attorney Osamu Matsuzawa (Patent Attorney) Komatsu Ltd. (patent attorney) 1m Fig. Fig.

Claims (2)

[Claims] (1) A fitting part 1 that divides the shield body 1 into a front shield 1a and a rear shield 1b, and is made up of an outer cylinder 1d and an inner cylinder 1e that mutually slide between the front and rear shields 1a and 1b.
In the shield excavator, the front shield 1a and the rear shield 1b are connected telescopically via c, and a thrust jack 4 is provided between the front shield 1a and the rear shield 1b.
The shield excavator is provided with an articulating mechanism 2 for bending the front shield 1a and the rear shield 1b between the fitting part 1c and the fitting part 1c and at least one of the fitting part 1c and the rear shield 1b. (2) a sliding member 2a in which the articulate mechanism 2 is formed by curving an annular plate into a spherical shape;
The shield excavator according to claim 1, wherein the sliding member 2a is constituted by fitting members 2b and 2c having a spherical fitting groove 2f into which the sliding member 2a is slidably fitted.