JPH10305988A - Grab for lifting work - Google Patents

Abstract

PROBLEM TO BE SOLVED: To dispense with the slinging work, and to achieve the labor saving and automation by closing an arm while a grab is positioned to a work, and opening the arm while the work is lowered on the ground. SOLUTION: A grab 10 is provided with an upper frame 11 to be suspended and held in a horizontal condition by a hook (lifting sling) 1 of a crane. A pair of arms 15 are suspended parallel to each other from the lower side of the upper frame 11, and the arms 15 are slidable in the horizontal direction so as to open/close the gap therebetween. A work receiving part 15c to pick up a segment (work) W by being inserted in the lower side of the segment W, is projected inside the lowest end of each arm, and four work receiving parts 15c are located in the same horizontal plane. In addition, a cylinder (a hydraulic cylinder, etc.) as a drive mechanism to open/close the arms 15 is provided between one arm 15 and the other arm 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lifting glove suitable for use when a shield segment is lowered by a hoist mainly in a shaft of a tunnel.

[0002]

2. Description of the Related Art When a segment is suspended in a shaft of a tunnel, the following is conventionally performed. That is, first, an operator puts a slinging wire on a segment placed on the ground, and hooks the wire on a hook of a hoist. Next, it is lifted and moved above the shaft, and suspended in a narrow shaft. At that time, suspend the car while paying attention not to touch the walls and equipment in the narrow shaft, and then hang it down to the bottom of the shaft, and the worker who took it below places the segment in a predetermined position (for example, on a bogie). In the process of removing the slinging wire.

[0003]

However, the conventional lifting operation has the following problems. (1) Since slinging is performed, the work load is large and automation is difficult. (2) At least two workers are required above and below the shaft, and it is difficult to save labor. (3) Due to the swing or rotation of the suspended load, the suspended load may come into contact with a side wall, a belly raising material, equipment, or the like in the narrow shaft, causing a collapse of the load.

[0004] The present invention takes into account the above circumstances, does not require slinging work, can achieve labor saving and automation, and
An object of the present invention is to provide a grab for a lifting operation that prevents a suspended load from swaying or rotating and enables a safe lifting operation.

[0005]

According to the first aspect of the present invention, there is provided a grab for lifting operation, comprising: an upper frame suspended and held by a lifting machine; A pair of arms slidably provided in a horizontal direction so as to be able to open and close the gap between them, a work receiving portion projecting from the inside of the lower end of each arm and receiving the work by being inserted below the work, A drive mechanism for opening and closing the arm.

When carrying out a lifting operation using this grab, first, the upper frame of the grab is lifted by a lifting machine. Then, the pair of arms suspended below the upper frame are opened by operating the drive mechanism, and in this state, the grab is suspended so as to cover the work on the ground. When the lower end of the arm approaches the ground, the lowering of the grab is stopped, and then the drive mechanism is operated to close the arm. Then, the work receiving portion projecting inside the lower end of the arm is inserted below the work. When the grab is lifted in this state, the work is lifted with the work placed on the work receiving portion. Next, the grab is moved to a position above the transport destination, and when the grab is moved, the grab is lowered. When the work lands on the receiving position of the transfer destination, the lowering of the grab is stopped and the arm is opened. By doing so, the lifting work of the work is completed.

A second aspect of the present invention is characterized in that a guide portion slidably engaged with a vertically installed guide rail is provided. In this glove, by engaging the guide portion with the guide rail, the glove can be lifted and lowered in a stable posture along the guide rail.

According to a third aspect of the present invention, a cylinder is provided as the drive mechanism for opening and closing the arm by being extended and contracted by connecting both ends to each arm, a closed position stopper for stopping the arm at a closed position, and An open position stopper for stopping at a position is provided. In this grab, since both ends of the cylinder are connected to the arm, the arm can be opened to the open position defined by the open position stopper by extending the cylinder, and the arm is defined by the closed position stopper by contracting the cylinder. Can be closed to the closed position. In this case, since the cylinder is not fixed to the upper frame, the freely moving arm is driven, and if both move freely, both arms are driven simultaneously. And, when one arm hits the work or hits the stopper, the other free arm is driven, and finally, when closing, both arms hit the closing position stopper and stop in the closed state, When opening, both arms come into contact with the open position stopper and stop in the open state.

The invention according to claim 4 is characterized in that two work receiving portions of each of the arms are arranged at intervals in a horizontal direction orthogonal to the opening and closing direction of the arms. In this grab,
Since two work receiving portions are provided for each arm, a substantially rectangular work such as a segment can be held in a stable posture.

The invention according to claim 5 is characterized in that a suspender receiver for hanging a suspender of a hoist is arranged above the upper frame, and the upper frame is connected to the suspender receiver via a horizontal turning mechanism. And In this grab, the direction of the work can be freely changed by operating the turning mechanism while being suspended by the lifting machine.

According to a sixth aspect of the present invention, a sensor for detecting that a load acting on a work receiving portion has decreased from a predetermined level to a predetermined level or less, and a driving mechanism is controlled in accordance with a detection signal of the sensor to close the sensor. A control device for operating the arm at the position to the open position. In this grab, when the work lands from the suspended state, the sensor detects the decrease in the load applied to the work receiving part,
The arm can be automatically driven in the opening direction.

The invention of claim 7 is characterized in that the grab is used for carrying out a lifting operation in a shaft. The invention of claim 8 is characterized in that the grab is used for lifting a tunnel segment in a shaft.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side view of the glove 10 of the embodiment, FIG. 2 is a plan view thereof, and FIG. 3 is a front view thereof. For convenience of explanation, the arrow X direction is a horizontal direction, and the arrow Y
The direction is the front-back direction.

The grab 10 is used for lifting a shield segment (work) W in a shaft during construction of a tunnel.
Frame 1 suspended and held in a horizontal state by
One. On the upper side of the upper frame 11, a suspender receiver 20 for hanging the hook 1 of the hoist is arranged.
Are connected via Reference numeral 23 denotes a turning shaft of the turning mechanism 22, to which the upper frame 11 is connected.

The upper frame 11 is formed by combining a pair of vertical frames 11a arranged at left and right ends (ends in the X direction) and a pair of horizontal frames 11b arranged at front and rear ends (ends in the Y direction). The central frame 1 arranged at the center in the left-right direction
1d is coupled to the pivot 23 at the longitudinal center. Also, one end 11c of each vertical frame 11a protrudes outward from the joint position with the horizontal frame 11b,
A guide roller (guide portion) 5 is provided on a side surface of each end 11c so as to be engaged with the guide rail 2 disposed vertically in the shaft. By fitting the guide roller 5 to the guide rail 2, the glove 10 is guided in the vertical direction in a state where the glove 10 is prevented from rotating.

Below the upper frame 11, a pair of arms 15 are suspended parallel to each other so as to face each other in the Y direction (front-back direction). These arms 15 are provided so as to be slidable in the horizontal direction so that the gap between them can be opened and closed. The arm 15 has a gate shape including a horizontal arm 15a at an upper end and a pair of left and right vertical arms 15b. Guide shafts 13 are arranged along the vertical frame 11 a on the lower surfaces of the left and right vertical frames 11 a of the upper frame 11.
The upper ends of the vertical arms 15b are slidably connected to each other.

Each guide shaft 13 is fixed to the lower surface of the vertical frame 11a of the upper frame 11 by an outer bracket 12 also serving as an open position stopper and an inner bracket 14 also serving as a closed position stopper. The outer bracket 12 as an open position stopper defines the position when the arm 15 is fully opened outward, and the inner bracket 14 as the closed position stopper defines the position when the arm 15 is minimized inward. It is specified. Also,
A work receiving portion 15c for scooping up the segment W by being inserted below the segment W is provided protruding from the lowermost inner side of each arm 15. There are a total of four work receiving portions 15c, which are located in the same horizontal plane. The maximum open position of the arm 15 is set so that the segment W
The position where c can pass sufficiently and the minimum closed position of the arm 15 are set to positions where the workpiece receiving portion 15c can surely scoop up the segment W.

Also, one arm 15 and the other arm 1
A cylinder 18 (any one of an air cylinder, a hydraulic cylinder, and an electric cylinder) as an opening / closing drive mechanism for the arm 15 is disposed between the arms 5. The cylinder 18 has a main body 18 a fixed to one arm 15 via a bracket 17, and a distal end of a rod 18 b connected to the other arm 15.

Next, the operation will be described. When hanging down the segment W in the shaft using this grab 10, first,
The hook 1 of the hoist is hooked on the hoist receiver 20 of the grab 10, the grab 10 is lifted by the hoist, and stopped just above the segment W to be conveyed. Then, the cylinder 18 is driven to open and fix the arm 15 to the maximum, and in that state,
The grab 10 is suspended so as to cover the work W on the ground.

With the assistance of a worker, the lowering of the glove 10 is stopped when the lower end of the arm 15 approaches the ground,
Next, the arm 15 is closed by operating the cylinder 18. Then, the four work receiving portions 15c provided at the lowermost end of the arm 15 are inserted below the segment W. When the grab 10 is lifted in this state, the segment W is gripped and lifted between the arms 15 while being scooped up by the work receiving portion 15c.

Next, the grab 10 is moved above the shaft,
After the movement, the direction of the segment W is changed by operating the turning mechanism 22 in a state where the segment W is hung by the hoist, if necessary. The guide roller 5 is guided by an operator.
Is fitted to the guide rails 2 arranged in the shaft, and the glove 10 is lowered to land on the bogie below the shaft. After landing, the descent of the glove 10 is stopped, and the arm 15 is fully opened by the cylinder 18.

When the transfer from the grab 10 to the bogie is completed, the hoisting of the hoist is started, the grab 10 is raised along the guide rail 2, the grab 10 is removed at the upper end of the guide rail 2, and the grab 10 is moved to a predetermined position. After turning, the grab 10 is returned to the segment yard by the hoist, and one cycle of work is completed.

In the above operation, the glove 10 can be lifted and lowered in a stable posture along the guide rail 2, so that the glove 1 can be mounted on the wall or equipment in the shaft.
Work safety can be achieved without contacting 0 or the segment W. Also, two work receiving portions 1 are provided for each arm 15.
5c, the rectangular segment W can be held in a stable posture. In addition, since the cylinder 18 is directly fixed to both arms 15 without being fixed to the upper frame 11, only the arm 15 that can move freely can be driven. If both arms 15 move freely, both arms 15 15 can be driven simultaneously. Therefore, the segment W can be gripped while maintaining the balance.

In addition, the segment W can be held and released by opening and closing the arm 15 in a state where the glove 10 is aligned with the segment W as described above. This greatly reduces the work load. In addition, since it is sufficient to arrange one full-time worker for lifting on the ground, labor saving is possible and it is possible to contribute to automation.

A sensor for detecting that the load acting on the work receiving portion 15c has fallen from a predetermined level to a predetermined level or less is provided, and the cylinder 18 is driven by a control device in accordance with a detection signal from the sensor to close the closed position. When the arm 15 is moved to the open position, the arm 15 can be automatically opened when the segment W lands from the suspended state. Therefore, the confirmation work under the shaft can be reduced, and further automation becomes possible.

[0026]

As described above, according to the first aspect of the present invention, the work can be held by the glove by closing the arm while the glove is positioned on the work. The holding of the work can be released by opening and operating the arm in a state where the landing is performed. Therefore, the slinging operation using the wire is unnecessary, and the work load can be greatly reduced. Also, as long as the operator only checks the positioning of the glove when holding the work and the movement of the glove to the upper side of the transport destination, the work can be left to the machine almost, so that labor can be saved, With only one worker on the ground, the lifting operation of the segment into the shaft can be performed. Therefore, automation can be easily handled.

According to the second aspect of the present invention, the glove can be raised and lowered in a stable posture along the guide rail by engaging the guide portion with the vertically installed guide rail. Therefore, swinging and rotation of the work in the suspended state can be reliably prevented, and work safety can be ensured.

According to the third aspect of the present invention, the work can be held or released by expanding and contracting the cylinder. In particular, since both ends of the cylinder are directly fixed to each arm, only the arm that can move freely can be driven, and the work can be held while balancing the two arms.

According to the fourth aspect of the present invention, since two work receiving portions are provided for each arm, a substantially rectangular work such as a segment can be reliably held in a stable posture.

According to the fifth aspect of the present invention, the direction of the work can be freely changed by operating the turning mechanism while being suspended by the lifting machine.

According to the sixth aspect of the present invention, when the work is hung to a predetermined destination, the arm can be automatically opened to release the holding of the work.

According to the invention of claim 7, it is possible to safely carry out the lifting work of materials and equipment in the shaft while reducing the work load, and according to the invention of claim 8, It is possible to safely lift tunnel segments within the tunnel.

[Brief description of the drawings]

FIG. 1 is a side view of an embodiment of the present invention.

FIG. 2 is a plan view of the embodiment of the present invention.

FIG. 3 is a front view of the embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lifter hook (hanging tool) 2 Guide rail 5 Guide roller (guide part) 11 Upper frame 12 Outer bracket (open position stopper) 14 Inner bracket (closed position stopper) 15 Arm 15c Work receiving part 18 Cylinder (drive mechanism) Reference Signs List 20 Hanger receiver 22 Horizontal turning mechanism W segment (work)

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kenji Watanabe 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Corporation (72) Inventor Teruo Ariga 4036-1 Nakatsu, Aikawa-cho, Aikawa-gun, Kanagawa Pref. Inside Koki Co., Ltd. (72) Inventor Tohru Yonekura 4036-1 Nakatsu, Aikawa-cho, Aiko-gun, Kanagawa Kokudo Koki Co., Ltd.

Claims (8)

[Claims] 1. A pair of upper frames suspended and held by a hoist, and a pair of horizontal frames suspended below the upper frames and slidably provided in a horizontal direction so as to open and close a gap between the upper frames. An arm, a work receiving portion projecting from a lower end of each arm and receiving the work by being inserted below the work, and a drive mechanism for opening and closing the arm. Grab for lifting work. 2. A glove for lifting work according to claim 1, further comprising a guide portion slidably engaged with a vertically installed guide rail. 3. A closing position stopper for stopping the arm at a closed position, and a cylinder for stopping the arm at an open position, wherein a cylinder for opening and closing the arm by extending and contracting the both ends is connected to each of the arms. 3. An open position stopper is provided.
Grab for lifting operation as described. 4. The apparatus according to claim 1, wherein two work receiving portions of each arm are arranged at an interval in a horizontal direction orthogonal to the opening and closing direction of the arms. Grab for lifting work. 5. A hoist receiver for hanging a hoist of the hoist is disposed above the upper frame, and the upper frame is connected to the hoist receiver via a horizontal turning mechanism. The glove for lifting work according to any one of claims 1 to 4, characterized in that: 6. A sensor for detecting that a load acting on the work receiving portion has fallen from a predetermined value to a predetermined value or less, and controlling the drive mechanism in accordance with a detection signal of the sensor, the sensor is in the closed position. The glove for lifting work according to any one of claims 1 to 5, further comprising a control device for moving the arm to the open position. 7. The glove for lifting work according to claim 1, which is used for performing a lifting work in a shaft. 8. The grab for lifting work according to claim 7, wherein the grab is used for lifting a segment of a tunnel in a shaft.