JP2803526B2 - Underground excavator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an excavator used for excavating a road, for example.

[0002]

2. Description of the Related Art As an excavator for constructing an underground wall in a space having a height restriction such as an underground construction, an excavator equipped with a kelly bar having a high head is not suitable. It is generally used.

The wire type grab excavator includes a boom pivotally supported at the tip of a base machine so as to be tiltable, and an excavation grab suspended at a tip of the boom via a wire so as to be able to move up and down. A base machine is set at a target excavation place, and a wire is fed by a winch installed on the base machine, and a wire is excavated under a road by a grab.

[0004]

In such a conventional excavator, the grab excavation position can be changed in the front-rear direction of the base machine by changing the inclination angle of the boom. The excavation position of the grab cannot be changed in the width direction of the base machine. For this reason, when excavating a continuous groove in the lateral direction, it is necessary to move the base machine laterally after excavating one groove.

However, when the corner of the trench to be excavated or the end of the underground continuous wall is close to the retaining wall or the adjacent structure, the width of the glove is smaller than the width of the base machine. However, there is a problem in that even if the base machine is brought close to these retaining walls and structures as far as possible, it is not possible to excavate the adjacent portion.

[0006] The present invention solves the above-mentioned problems, and by exposing the grab itself to the base machine, it is possible to excavate a trench close to a retaining wall or an adjacent structure. An object of the present invention is to provide an underground excavator.

[0007]

In order to achieve the above object, the present invention provides a boom pivotally supported by a base machine, and a boom suspended from the tip of the boom via a pair of wires. A road-side excavator equipped with an excavating grab, the rotatable plate being rotatable relative to a vertical axis with respect to a top of the grab, and each wire being connected thereto, and being fixed to the top of the grab. And a driving means for rotating the turntable by a predetermined angle.

[0008]

According to the above arrangement, when the rotating disk is rotated by the driving of the driving means, the glove can be rotated at a rotation angle corresponding to the rotation angle, and as a result, the attitude of the glove with respect to the base machine can be changed. .

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. 1 to 3 show a road excavator according to the present invention. The excavator includes a base machine 1,
Boom 2 pivotally supported at the front of base machine 1
And a digging grab 4 suspended from the tip of the boom 2 via a pair of wires 3 so as to be able to move up and down. The base machine 1 includes a machine body 7 that can turn on the track 5 and can run by driving the track 5. The cab 6 and various driving mechanisms are mounted on the machine body 7.

[0010] The boom 2 is formed in an inverted L-shape toward the front in accordance with height restrictions in an underpass or the like.
By driving a pair of tilting hydraulic cylinders 8, the tilting hydraulic cylinders 8 are supported to tilt at a predetermined angle with respect to the machine body 7. A winch 9 for winding and feeding the wire 3 is fixedly arranged at the rear of the boom 2 in a backpacking manner. Wire 3
Is a sheave 1 pivotally supported at the top and front of the boom 2
It is fed out or wound up by the winch 9 using 0 and 11 as guides.

The glove 4 includes a body 12 suspended from the wire 3, a guide 14 for keeping the vehicle arranged all around the upper portion of the body 12, and a pair of openable and closable excavations provided at the lower end of the body 12. And a drive hydraulic cylinder 16 for opening and closing each shell 15.

In the center of the top of the body 12, FIG.
As shown in FIG. 2, a rotating disk 17 rotatable around a vertical axis with respect to the body 12 is pivotally supported. The pair of wires 3 is fixed to the upper portion of the rotating disk 17. A sprocket portion 18 is provided integrally on the outer periphery. A chain 19 is hung around the sprocket portion 18, and both ends of the chain 19 are connected to respective plungers 20 a of a set of hydraulic cylinders 20 (drive means) for posture change fixed to the top of the body 12. Each hydraulic cylinder 20 has one plunger 20
By setting the hydraulic drive circuit so that the other expands when a is retracted, the sprocket 18 can be rotated via the chain 19 and the glove 4 can be turned in both forward and reverse directions.

FIG. 4A shows a state in which the body 12 of the glove 4 is held in alignment with a line O parallel to the width direction of the machine body 7. In this state, when the rotary cylinder 17 is rotated clockwise in the figure by driving the hydraulic cylinder 20 as shown in FIG. 4 (b), the wire 3 is twisted, and the tension always causes the rotary disk 17 to be in the initial position. As a result of a counterclockwise reaction force to be returned, the body 12 is suspended from each wire 3 in a state in which the posture is changed with respect to the parallel line O of the machine body 7 by an angle corresponding to the driving amount of the hydraulic cylinder 20. Will be retained.

Therefore, as shown in FIG. 5, in the case of constructing an underground continuous wall in a direction perpendicular to the direction in which the obstacles 30 such as H steel and shoring constituting the side wall of the underpass are arranged (left-right direction in the figure). When the end is close to the obstacle 30, first, the boom 2 is positioned substantially at the center of the machine body 7, as shown in FIG. In this state, the groove 31 a is excavated by feeding and winding the wire 3 by the winch 9 and opening and closing the shell 15 by driving the hydraulic cylinder 16. After that, in the conventional excavator, the end groove 31b could not be excavated even if the base machine 1 was moved toward the obstacle 30 as far as possible.

On the other hand, in the present invention, the base machine 1 is turned rightward (clockwise in the figure) by a predetermined angle to advance the glove 4 so as to approach the obstacle 30 and to drive the hydraulic cylinder 20. By rotating the turntable 17 in the opposite direction, the glove 4 can be positioned at the end of the groove 31a along the continuous direction of the groove 31a, as shown in FIG. By opening and closing the shell 15 by driving of the 16, the end groove 31 b continuous with the groove 31 a and close to the obstacle 30 can be excavated.

In the above embodiment, the rotary drive means of the rotary disk 17 is constituted by a set of hydraulic cylinders 20. However, another configuration, for example, a gear is engraved on the outer periphery of the rotary disk 17 and meshes with this gear. Of course, the gear may be rotated by a motor. Further, in the above embodiment, the rotating disk 17
Is supported on the top of the grab 4 and the lower end of the wire 3 is fixed to the turntable 17. For example, the wire is inserted into an insertion hole formed in the turntable 17 without supporting the turntable 17 on the top of the grab 4. And the lower end of the wire is inserted into the body 1 of the grab 4.
2 and the rotating disk 17 may be rotated by driving means fixed to the top of the glove 4.

[0017]

As explained in detail in the above embodiment, in the underground excavator according to the present invention, the turning angle grab according to the rotation angle of the turntable by the driving means is turned, and the base machine Can be changed, so that a groove close to a retaining wall or an adjacent structure or a groove where a base machine cannot turn can be excavated.

[Brief description of the drawings]

FIG. 1 is a side view of a below-road excavator according to the present invention.

FIG. 2 is a plan view of the same.

FIG. 3 is a front view of the same.

FIG. 4 shows a main part of the present invention, and FIG. 4 (a) is a plan view of the main part when a glove is positioned parallel to a base machine. (B) is a main part plan view when the posture of the grab is changed.

FIG. 5 shows excavation work by the excavator of the present invention,
(A) is a top view at the time of normal excavation. (B) is a top view when excavating a ditch near an obstacle.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Base machine 2 Boom 3 Wire 4 Excavation glove 12 Body 17 Turntable 18 Sprocket part 19 Chain 20 Attitude change hydraulic cylinder (drive means) 20a Plunger

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) E02F 3/47 E02F 5/02 E21B 11/04

Claims (1)

(57) [Claims] 1. An under-road excavator comprising: a boom pivotally supported by a base machine so as to be tiltable; and an excavation grab suspended at a tip of the boom via a pair of wires so as to be able to move up and down. A rotating disk that is rotatable relative to a vertical axis with respect to the top of the grab and to which the wires are connected, and a driving unit that is fixed to the top of the grab and rotates the rotating disk by a predetermined angle. An underground excavator characterized by the following.