JPH08303197A - Grasping device for assembling simple tunnel timbering steel - Google Patents

Abstract

PURPOSE: To improve workability by a method wherein a pair of grasping arms are pivotally mounted on the yoke part of a base mounted on the tip of the boom of a back hoe, etc., and rotated by a hydraulic cylinder for nipping to nip a timbering steel therebetween, and the end face of the timbering steel is pressed by a cylinder for pushing. CONSTITUTION: When timbering steels S1 placed at the bottom of a tunnel are assembled together, grasping arms 17 and 22 of a grasping device 10 are moved to a position, wherein the timbering steel S1 is grasped, by operating a beam. A hydraulic cylinder 26 for nipping is then stretched, the grasping arm 17 is rotated to the timbering steel S1 side, and the grasping arm 22 is rotated to the timbering steel S1 side through the medium of a link plate 25. The arms 17 and 22 then grasp a timbering steel middle thickness part S and when an oil pressure in the cylinder 26 is increased to a value higher than a specified value, a cylinder 27 for pushing is stretched, the timbering steel S1 is pressed by a presser fitment 29 to reliably grasp the timbering steel. Further, by operating a boom, the timbering steel S1 is moved to a given position for assembly. This constitution performs safe execution of a work by using a general purpose machine.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gripping device for assembling a simple tunnel supporting steel.

[0002]

2. Description of the Related Art FIG. 1 is a view showing an embodiment of the present invention. Of these, known parts will be described for better understanding of the present invention.

For example, in order to prevent the mountain G from collapsing by excavating a mountain tunnel T, a reaction force is applied to the lower part of the tunnel T, and a steel material (usually H-shaped steel) joins the upper part of the tunnel cross section in a semicircular shape. The supporting steel S has been conventionally assembled by manpower or a dedicated machine.

[0004]

The conventional manual assembly is a dangerous work, and the installation by a dedicated machine increases the construction cost.

It is an object of the present invention to provide a safe and inexpensive gripping device for assembling a simple tunnel supporting steel.

[0006]

According to the present invention, there is provided a gripping device which is mounted in place of the bucket of a machine having a required reach and which can move a bucket at the tip of a boom up and down. A pair of gripping arms that are attached to each other and have gripping parts formed in a direction toward each other, a sandwiching hydraulic cylinder that rotates the pair of gripping arms to sandwich the supporting steel, and the hydraulic pressure of the hydraulic cylinder is equal to or greater than a predetermined value. And an extruding cylinder attached to the base for pressing the end face of the supporting steel.

[0007]

In the simple tunnel support steel assembling gripping device constructed as described above, the boom tip is moved to position the gripping arm of the gripping device at a position where the support steel placed on the tunnel bottom can be sandwiched. . Then, the sandwiching hydraulic cylinder is operated to close the gripping arm and sandwich the supporting steel.
Then, when the hydraulic pressure of the hydraulic cylinder reaches a predetermined value or more, the pushing cylinder automatically extends to press the end surface of the supporting steel held by the gripping arms to fix the supporting steel. Therefore, the boom is moved to position the gripping device at a predetermined position, the supporting steel is assembled, and the supporting steel is released by the operation reverse to the above.

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, a machine having a required reach capable of vertically moving a bucket at the tip of a boom, in the illustrated example, a second boom is provided at the tip of a first boom 3 which is undulated by a first hydraulic cylinder 2 of a backhoe 1. One end of 5 is pivotally attached and the second
It is designed to be undulated by the hydraulic cylinder 4. A gripping device, generally designated by 10, is attached to the other end of the second boom 5, and is configured to be undulated with respect to the second boom 5 by a third hydraulic cylinder 6 and a link 7.

2 and 3, the base 11 of the gripping device 10 has a yoke-like connecting portion 13 connected to the second boom 5 and the link 7 protruding from one end of a cylindrical body 12. Two pairs of yoke portions 14 and 15 are projectingly provided at the ends. One of the yoke portions 14 (lower side in FIG. 3),
A gripping arm 17 is pivotally attached to the frame 14 by a vertical pin 16, and an inwardly bending gripping part 18 is formed at the end thereof. A connecting pin 19 is erected on the side of the arm 17 facing the grip portion 18, and a drive pin 20 is erected on the outside of the connecting pin 19. Similarly, the vertical yoke 21 holds the grip portion 23 on the other yoke portion 15, 15.
A gripping arm 22 having a pin is pivotally attached to the gripping portion 2 of the pin 21.
A connecting pin 24 is erected on the 3 side.

Both connecting pins 19 and 24 are connected by a link plate 25. A sandwiching hydraulic cylinder 26 is provided between the drive pin 20 and the main body 12.

On the other hand, an inner cylinder A is inserted inside the main body 12 via a bush B made of synthetic resin.
A hydraulic cylinder 27 for extrusion is formed in the cylinder 27, and a push fitting 29 is attached to the tip of the piston rod 28 of the cylinder 27.
Is fixed. And both cylinders 26 and 27 are
Each is connected to a hydraulic control valve 30. In addition,
Reference numeral 31 in FIG. 2 is a hose connector connected to a hydraulic source (not shown), and reference numeral 32 in FIG. 3 is a sandwiching hydraulic cylinder protective steel plate.

Next, the operation will be described.

As shown in FIG. 1, excavating downward from the upper surface of the tunnel T, the supporting steel S1 indicated by a chain line at the tunnel bottom T1 is placed under the supporting steel S previously assembled as indicated by the solid line. At the time of assembling, first, the booms 3 and 5 of the backhoe 1 and the cylinders 2, 4 and 6 are operated, and the gripping device 1
As shown in FIG. 3, the zero gripping arms 17 and 22 are moved to a position where the supporting steel S1 can be gripped.

Then, when the sandwiching hydraulic cylinder 26 is extended by the hydraulic control valve 30, the gripping arm 17 is rotated to the supporting steel S1 side with the vertical pin 16 as a fulcrum, and at the same time, the connecting pin 19, the link plate 25 and the connecting pin 2 are connected.
The other gripping arm 22 is rotated via 4 to the supporting steel S1 side. Then, the gripping portion 1 of both gripping arms 17 and 22
When 8 and 23 grip the inner wall portion s (see FIG. 3) of the supporting steel S1 and the hydraulic pressure of the cylinder 26 rises above a certain value, the hydraulic control valve 30 causes the pushing hydraulic cylinder 27 to move.
To stretch. Then, the retainer 29 is pushed out and presses the top surface s1 of the supporting steel S1, and both gripping arms 17, 22 are pressed.
The supporting steel S1 is securely gripped and fixed in cooperation with.

Next, both booms 3, 5 and cylinder 2,
4 and 6 are operated to move the supporting steel S1 to the solid line position to assemble the supporting steel S below the supporting steel S. Then, both cylinders 25 and 26 are contracted, and the supporting steel S1 is released from the gripping device 10 to Move to working position.

In FIG. 1, the supporting steel S1 can be sandwiched by the gripping device even if it is placed at a right angle and an angle with respect to the machine body 1.

In FIG. 3, a nylon bush B is inserted between the base 11 and the inner cylinder A, and both are about 110.
The degree position is designed to rotate. Therefore, supporting steel S
If the center of No. 1 is removed and gripped, the one who is heavier by gravity always comes down, and the supporting steel becomes vertical so that it can be in the built-up posture.

[0019]

EFFECTS OF THE INVENTION Since the present invention is constructed as described above, it is possible to assemble the supporting steel safely at low cost by using a general-purpose machine such as a backhoe, and safely without manpower. Can be planned.

[Brief description of drawings]

FIG. 1 is a side view showing a backhoe to which a gripping device embodying the present invention is attached.

FIG. 2 is a side view showing an embodiment of the present invention.

FIG. 3 is a top view of FIG.

[Explanation of symbols]

 G ... Solid ground S, S1 ... Support steel T ... Tunnel T1 ... Tunnel bottom s ... Medium part s1 ... Top surface 1 ... Backhoe 2 ... First hydraulic pressure Cylinder 3 ... 1st boom 4 ... 2nd hydraulic cylinder 5 ... 2nd boom 6 ... 3rd hydraulic cylinder 7 ... Link 10 ... Grasping device 11 ... Base 12 ... -Main body 13 ... Connection part 14, 15 ... Yoke part 16, 21 ... Vertical pin 17, 22 ... Grip arm 18, 23 ... Grip part 19, 24 ... Connection pin 25. ..Link plate 26 ... Holding hydraulic cylinder 27 ... Pushing hydraulic cylinder 28 ... Piston rod 29 ... Pushing metal fitting 30 ... Hydraulic control valve 31 ... Hose connector 32 ... Holding Hydraulic cylinder protective steel plate

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yasuge Adachi 1-25-1, Nishishinjuku, Shinjuku-ku, Tokyo Taisei Corporation

Claims (1)

[Claims] 1. A gripping device, which is attached in place of a bucket of a machine capable of vertically moving a boom tip bucket having a required reach, wherein the gripping parts are pivotally attached to the yoke portions of the base and are close to each other. A pair of gripping arms formed, a sandwiching hydraulic cylinder that rotates the pair of gripping arms to sandwich the supporting steel, and the end face of the supporting steel is pressed when the hydraulic pressure of the hydraulic cylinder is a predetermined value or more. A gripping device for assembling a simple tunnel supporting steel, comprising a pushing cylinder attached to a base.