JPH07103776B2 - Shield machine - Google Patents

Description

TECHNICAL FIELD The present invention relates to a shield machine that can be installed along a sharp curve.

(Prior Art) Conventional shield excavators for excavating tunnels employ a gripper propulsion system that allows construction along a curve while receiving a reaction force from the gripper.

Some excavators adopting the gripper propulsion system have a main beam b provided at the center of a shield body a as shown in FIG.

A cutter head c for excavating a face is provided at the tip of the main beam b, and a gripper d is movably supported at an intermediate portion of the main beam b. Between the gripper d and the main beam b. Is provided with a thrust cylinder e that propels the main beam b.

When the work is performed along a curved line, the rear end of the main beam b is swung by the gripper cylinder f that expands and contracts the gripper d, and the cutter head c provided at the tip of the main beam b is turned in the curved direction to form a curved line. It is possible to dig along.

As another shield excavator, as shown in FIG. 9, the shield body a is divided into a front shield g and a rear shield h, and the space between the shields g and h is made flexible by an articulate cylinder i. There is something.

Each shield g, h is provided with a gripper j, k for receiving a reaction force. The grippers j, k excavate while receiving a reaction force from each other. The front and rear shields g, h are bent. This made it possible to construct along a curve.

(Problems to be Solved by the Invention) However, any shield machine requires an extra excavation to excavate the outside of the shield main body a during curved construction, so that the excavation speed is slow and construction other than rock is difficult.

Further, if the former main beam b penetrates the central portion of the shield body a, it is difficult to construct along the sharp curve, and even if the latter shield body a is divided into front and rear, construction along the sharp curve is difficult. In this case, since it becomes difficult to seal the fitting portion 1 provided between the front shield g and the rear shield h, there is a problem that construction along a sharp curve is difficult.

The present invention has been made for the purpose of improving the above problems, and an object of the present invention is to provide a shield machine in which construction along a sharp curve can be performed easily and efficiently.

(Means and Actions for Solving the Problems) In order to achieve the above object, the present invention divides a shield body into multiple parts, for example, a front shield, an intermediate shield, and a rear shield, and divides the front part of the front shield into front faces. A cutter head for excavating the face is provided on each of the shields, and a gripper is provided on each shield to support the reaction force at the time of propulsion by these grippers, and the shields are expandable and contractible and rotatable about the spherical portion. The shields are connected flexibly by a device, and a plurality of thrust cylinders provided between the shields alternately propel the shields.

This eliminates the need for a skin plate mating part that limits the center bending angle, so that excavation along a sharp curve can be performed without excess digging, and multiple grippers among the grippers provided on each shield can be used. Since it receives a propulsion reaction force, it enables sharp curve construction in a wide range of geology such as hard rock, soft rock, and rock.

(Embodiment) An embodiment of the present invention will be described in detail with reference to the drawings shown in FIGS. 1 to 7.

In the figure, reference numeral 1 is a shield body, which is divided into three parts, a front shield 1a, an intermediate shield 1b, and a rear shield 1c.

A cutter head 3 which is rotated by a cutter motor 2 is provided on the front surface of the front shield 1a. The cutter head 3 excavates a face in front of the shield body 1 and the excavated earth and sand are removed into the chamber 3a. After being inserted, the soil discharging device 4 such as a belt conveyor provided so as to penetrate through the central portion of the shield body 1 is carried out rearward.

Also, the front shield 1a, the middle shield 1b, and the rear shield
The shields 1a to 1c are alternately fixed to the inner wall of the tunnel on the outer periphery of each 1c and grippers 5, 6 and
7 is provided, and the shields 1a, 1b, 1c are flexibly connected by a connecting device 8 made of a ball joint.

That is, the rear end of the front shield 1a, the front and rear ends of the intermediate shield 1b, and the front end of the rear shield 1c are formed in a tapered shape so as not to interfere with each other during bending, and the central portion of the front shield 1a and the rear shield 1c are formed. A shaft portion 8a of the connecting device 8 is slidably supported at the center portion.

The shaft portion 8a has a double structure as shown in FIGS. 3 and 4, and the tubular portion 8b slidably fitted to the shaft portion 8a is attached to the front shield 1a and the rear shield 1c. The shaft portion 8a and the spherical portion 8c that is bulged at one end of the shaft portion 8a are hollow, and are hollow so that the soil discharging device 4 can pass therethrough.

On the other hand, the spherical portion 8c formed at one end of each shaft portion 8a is slidably supported on the central portion of the intermediate shield 1b via a spherical surface receiver 8d, and the front and rear shields 1a, 1c are centered around these spherical portions 8c. The intermediate shield 1b can be bent, and the spherical portions 8c are connected to each other via a flexible tube 9 in which the soil discharging device 4 is inserted.

In addition, a plurality of thrust cylinders are provided between the front shield 1a and the middle shield 1b, and between the middle shield 1b and the rear shield 1c.
Ten are provided.

The shield portions 10a of the thrust cylinders 10 are attached to the intermediate shield 1b and the rear shield 1c via a spherical bush 11, respectively, and the tip of a rod 10b protruding from the cylinder portion 10a is attached to the front via a spherical bush 12. They are attached to the rear end of the partial shield 1a and the rear end of the intermediate shield 1b, respectively.

Next, the operation of excavating along a sharp curve by the shield machine will be described.

During straight line excavation, the front shield 1a, the intermediate shield 1b, and the rear shield 1c are held in a straight line as shown in FIG. 2, and the thrust cylinder 10 causes the front shield 1a,
The intermediate shield 1b and the rear shield 1c are sequentially advanced to proceed with the excavation. When constructing along a sharp curve, the expansion / contraction amount of each thrust cylinder 10 is adjusted as shown in FIG. 1 to adjust the front shield 1a and the intermediate shield 1b. Also, the space between the rear shields 1c is bent along a sharp curve.

First, as shown in FIG. 5, the middle shield 1b and the rear shield 1c are fixed to the inner wall of the tunnel by grippers 6 and 7, and in this state, the front shield is formed by the thrust cylinder 10.
1a is propelled and the cutter head 3 excavates while receiving a reaction force by the grippers 6 and 7.

The excavated earth and sand are taken into the chamber 3a and then discharged to the rear by the earth discharging device 4, and when one pitch is excavated, the front shield 1a and the rear shield 1c are then removed by the grippers 5 and 7 as shown in FIG. Fixed, middle shield 1b and rear shield
The thrust cylinder 10 of 1c propels the intermediate shield 1b.

Thereafter, as shown in FIG. 7, the front shield 1a and the intermediate shield 1b are fixed by the grippers 5 and 6, the thrust cylinder 10 of the intermediate shield 1b and the rear shield 1c is shortened, and the rear shield 1c is advanced.

By excavating along the sharp curve by repeating the above operation, the center lines of the front and rear shields 1a and 1c can be bent up to about 20 ° with respect to the center line of the intermediate shield 1b. It becomes possible to easily perform the construction.

(Effects of the Invention) As described in detail above, the present invention divides the shield body into multiple parts, connects the shields with a connecting device that is expandable and rotatable, and uses a thrust cylinder provided between the shields. Since the shields are alternately propelled and excavated, it is not necessary to provide a fitting part for limiting the center bending angle between the front and rear shields, unlike the conventional shield having a skin plate on the outer circumference. The construction along the curve can be done easily.

In addition, since no extra trench is required, it is possible to greatly improve the excavation efficiency during curved construction, and it is possible to excavate while receiving the reaction force by the multiple grippers provided on each shield. Since it is possible to propel even on soft ground, it is possible to easily perform construction on a wide range of soils.

In addition, since the inside of the connecting device for connecting the shields is formed to be hollow so that the soil can be discharged, the soil can be easily discharged.

[Brief description of drawings]

FIG. 1 is a sectional view of a shield machine according to an embodiment of the present invention, FIG. 2 is a schematic view thereof, FIG. 3 is an enlarged perspective view of a connecting device, and FIG. 4 is a perspective view of the same when extended. 5 to 7 are explanatory views of the operation, and FIGS. 8 and 9 are explanatory views of the conventional shield machine. 1 ... shield body, 1a ... front shield, 1b ... intermediate shield, 1c ... rear shield, 3 ... cutter head, 5,6,7 ... gripper, 8 ... coupling device, 8c ... sphere Part, 10 ... Thrust cylinder.

Claims (1)

[Claims] 1. A shield head 1 is divided into multiple parts, for example, a front shield 1a, an intermediate shield 1b, and a rear shield 1c, and a cutter head 3 for excavating a face is provided on the front face of the front shield 1a. Grippers 5, 6 and 7 are provided on the shields 1a, 1b and 1c, respectively, to support the reaction force during propulsion by these grippers 5, 6 and 7 and to expand and contract between the shields 1a, 1b and 1c and the spherical portion 8c. So that the shields 1a, 1b, 1c are alternately propelled by a plurality of thrust cylinders 10 provided between the shields 1a, 1b, 1c. A shield excavator.