JPH0867459A - Lift device for shaft - Google Patents

Abstract

PURPOSE: To simplify a cage elevating mechanism and to maintain it regardless of blasting work by devising a guide block to relatively slide as a load is applied on a guide winch winding shaft and tensile force is applied on a guide wire by weight of a counter weight at the time when the counter weight reaches the bottom of a shaft. CONSTITUTION: When a guide wire 5a is delivered, a counter weight 6 is lowered by its dead-weight and it reaches the bottom of a shaft 51. When it reaches the bottom of the shaft 51, torque is controlled so that a winding shaft of a guide winch 5 is not made an idler but can be maintained in a state where certain tension is applied on the guide wire 5a. Consequently, it is possible to maintain a vertical position of the guide wire 5a without deflection by using weight of the counter weight 6. In this way, it be comes possible to constrain and guide the posture of a cage 3 by two pieces of the guide wires 5a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lift that is used at a shaft excavation site when constructing a deep foundation or the like, and is provided for an operator to enter and exit the shaft.

[0002]

2. Description of the Related Art As a construction method for underground shafts such as deep foundations,
Generally, a steel sheet pile is driven into the ground to form a shield space, and a cylindrical liner plate is sequentially arranged in a shaft to construct a shield space.

In the latter case, a liner plate is constructed and a dedicated lifting device is attached to the operator to enter and exit the shaft, which is used for blasting work at the bottom of the shaft, observing excavation conditions, and treating groundwater. Work is done.
The lift device includes a cage connected to a winch on the ground side by a wire, and the operator is transferred between the shaft bottom and the ground side by moving the cage up and down.

In order to move the cage up and down in the shaft, conventionally, racks are sequentially connected to the liner plate, and the cage is generally provided with a guide pinion that meshes with the rack. If the rack and the guide pinion are provided, the cage is lifted and lowered while the posture is kept stable by the operation of the wire between the winch and the winch.

[0005]

However, it is necessary to construct a liner plate according to the depth of excavation and to add racks accordingly. For this reason, the rack laying work takes time with respect to the progress of the excavation work, and the increase in the construction time and the work load cannot be ignored.

Further, in order to allow the cage to reach the bottom of the shaft, it is necessary to install the rack along the liner plate to a position immediately near the bottom of the shaft. In this case, when blasting at the bottom of the shaft, the blasting work is performed without removing the rack, so the rack is easily damaged. For this reason, it may be necessary to replace the rack, and it may be difficult to move the cage up and down quickly.

As described above, the conventional cage raising / lowering mechanism has a problem in terms of labor for laying the rack and damage to the rack.

An object to be solved in the present invention is to provide a lift device which can drive a cage up and down with a simple mechanism and can maintain the cage regardless of blasting work or the like.

[0009]

SUMMARY OF THE INVENTION The present invention is directed to a frame installed on the ground facing a vertical shaft, a wire connected to a lifting winch provided in the frame for feeding and winding, and a wire suspended from the wire. A lift device provided with a cage that is lowered and moves downward inside the shaft and moves upward toward the outside, the guide wire being fed out and wound up from a guide winch provided in the frame, and connected to the guide wire. And a counterweight for landing on the bottom of the shaft, wherein the cage is provided with a guide block capable of sliding the guidewire substantially vertically and restraining the posture of the cage together with the guidewire. It is characterized by

The guide wire may be a U-shaped loop that drops from the frame into the shaft to form two tracks in the vertical direction, and the guide block may be connected to each of the two guide wires. .

It is also possible to provide guide blocks at at least two upper and lower positions for each of the two guide wires.

[0012]

[Function] When the counterweight is landed on the bottom of the shaft, if the load is applied to the take-up shaft of the guide winch, the weight of the counterweight can give tension to the guide wire and the guide block It becomes relatively slidable along the guide wire, and the cage moves up and down by being guided by the guide wire.

If the guide wire is a U-shaped loop,
The cage can be connected to the two guide wires, and the cage can be restrained and held at at least two points. Further, if guide blocks are provided at upper and lower two positions with respect to each line, the cage can be held by four-point support.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a side view showing a situation in which the lift device of the present invention is attached to a construction site of a vertical shaft, and FIG. 2 is a front view thereof. 3 is a plan view of FIG. 1 and FIG. 4 is AA of FIG.
FIG. 6 is a plan view of the main part at the position of the arrow.

In the figure, a shaft 51 is constructed by a liner plate 50 arranged in parallel with excavation work, and a lift device 1 is installed on the ground.

The lift device 1 is provided with a frame 2 having a weight 2a fixed to the ground side, and a cage 3 which can be lifted and lowered from the frame 2 with respect to a vertical shaft 51.

The cage 3 is connected at one end to a lifting winch 4 provided on the frame 2 and is connected to a wire 4a passing through a sheave 4b rotatably provided at the upper end of the frame 2,
By driving the lifting winch 4, the lifting operation can be performed at a predetermined speed. The lifting operation is operated from the ground side by the operation panel 2b provided on the frame 2 side. In addition, a cable (not shown) for power supply is connected to the cage 3, and a manually operated cable reel 2c for winding and unwinding the cable as the cage 3 moves up and down is attached to the frame 2. Set up.

Further, a guide winch 5 is provided on the frame 2 and one end thereof is connected to a winding shaft of the guide wire 5a.
Through a movable sheave 5b provided on the upper end of the frame 2, and one end thereof is similarly connected to a fixed sheave 5c arranged on the upper end of the frame 2. These movable sheaves 5b
The fixed sheave 5c and the fixed sheave 5c are arranged on the left and right sides of the sheave 4b for the cage 3 as shown in FIG.

The guide wire 5a draws a substantially U-shaped loop between the movable sheave 5b and the fixed sheave 5c, and the operation of the guide winch 5 moves the loop up and down. Then, the counterweight 6 is connected to the guide wire 5a so as to be included in the loop portion.

As shown in FIG. 5, the counterweight 6 is provided with a weight block 6a and a pair of pulleys 6b and 6c arranged on the upper surface side thereof. Both of these pulleys 6b and 6c are rotatable, and the guide wire 5a passes through so as to scoop up the pulleys 6b and 6c. The distance between the axes of the pulleys 6b and 6c is set so that the two guide wires 5a suspended from the movable and fixed sheaves 5b and 5c are parallel to each other. The weight of the counterweight 6 is about 1.5 tons.

With the arrangement of the counterweight 6 as described above, the guide winch 5 is driven to guide the guide wire 5a.
2 is pulled up from the state of FIG. 2, the guide wire 5a is wound up from the movable sheave 5b side, and the counterweight 6 is raised while the posture shown is maintained by the rotation of the pulleys 6b and 6c. Further, when the guide wire 5a is unwound, it is lowered by the weight of the counterweight 6 and can be landed on the bottom of the vertical shaft 51 as shown in FIG.

When the counterweight 6 is landed on the bottom of the vertical shaft 51 as shown in FIG. 2, the take-up shaft of the guide winch 5 is not an idler, but a certain amount of tension is applied to the guide wire 5a. The torque is controlled so that it can be kept as it is. By this operation, the weight of the counterweight 6 can be used to hold the guide wire 5a in a vertical posture without bending, and the guide wire 5a having two threads can restrain and guide the posture of the cage 3. It will be possible.

FIG. 6 is a right side view of the cage 3, and FIG. 7 is a rear view showing the right half as an internal structure.

The back surface of the cage 3 has a symmetrical structure,
The skids 3a are vertically fixed to the left and right ends, and guide blocks 3b are provided at the upper and lower ends of the skids 3a. This guide block 3b
As shown in the left half of the plan view of the casing 2 in FIG. 3, a slide hole 3c is formed so that the guide wire 5a can relatively pierce through. 6 and 7, one guide block 3b is provided on the lower end side, but instead of this, the guide block 3b arranged on the lower side as shown in FIG. Can be provided at any position, and in any case, one guide wire 5a
However, the cage 3 may be restrained by supporting at two points.

In addition, in the portion sandwiched between these guide blocks 3b, a conventionally known escape prevention device 3d is incorporated so that the guide wire 5a can be passed therethrough, and the cage 3
At the time of abnormal descent, the casing 3 is automatically stopped by holding and locking the guide wire 5a.

Further, two guide rails 3e running in the vertical direction are provided at the center of the back of the cage 3. These guide rails 3e have a shape in which the upper end and the lower end open slightly to the outside, and are used as guides for the frame 2 when it is raised to the frame 2 side and as restraint members between the frame 2 and the frame.

In the above construction, as shown in FIGS. 1 and 2, the counterweight 6 is landed on the bottom of the shaft 51 in accordance with the excavation depth of the shaft 51, and a proper tension is applied to the guide wire 5a. Set to. Such an operation is possible by maintaining the amount of rotation and torque of the output shaft of the guide winch 5, and if the amount of extension of the guide wire 5a is operated, the counterweight 6 can be adjusted in accordance with the digging depth of the vertical shaft 51. Can be properly installed on the bottom.

The cage 3 can be lowered from the position indicated by the solid line in FIG. 1 to the position indicated by the alternate long and short dash line by feeding out the wire 4a by the winch 4 for raising and lowering. At this time, the guide block 3b provided on the back portion of the cage 3 causes the cage 3 to move to four guide wires 5a.
It slides while being restrained at points. Since the guide wire 5a is held so as to have an appropriate tension, the cage 3 does not swing back and forth, but descends in a stable posture.

In this way, by providing the two guide wires 5a with tension between the counterweight 6 and the guide winch 5, the lowering of the cage 3 can be guided like the conventional rack and guide pinion. it can. Then, during the work of blasting the bottom of the shaft 51 and the recovery of the worker, the cage 3 can be raised to the ground side while maintaining the posture by the guide wire 5a.

When blasting or performing other work at the bottom of the shaft 51, the guide wire 5a is wound up by the guide winch 5 and the counterweight 6 is also pulled up and retracted. When the blasting work is completed, the vertical shaft 5
If it is operated so as to be lowered to the bottom of 1, the counterweight 6 and the guide wire 5a will not be damaged.

[0031]

According to the present invention, since the guide wire with the counterweight suspended can be used for guiding the raising and lowering operation of the cage, it is not necessary to add a guide rack each time the digging depth increases as in the conventional case. The workability is improved and the work load is reduced.

In addition, during work such as blasting, not only the cage but also the counterweight and guide wire can be raised and retracted, so that damage can be prevented and the counterweight can be simply lowered after the work is completed. The guide mechanism for the cage can be obtained immediately and the construction time can be shortened.

[Brief description of drawings]

FIG. 1 is a side view showing a main part when a lift device of the present invention is installed in a shaft excavation site.

FIG. 2 is a view of the lift of FIG. 1 as seen from the front side of the device.

FIG. 3 is a plan view of FIG.

FIG. 4 is a plan view taken along the line AA of FIG.

FIG. 5 is a detail of the weight block, (a) of which is a front view thereof and (b) of which is a right side view thereof.

FIG. 6 is a right side view of the cage.

FIG. 7 is a view of the cage seen from the rear side, showing the left half as an external appearance and the right half as an internal structure.

FIG. 8 is a plan view of the cage showing the arrangement of the guide block and the escape prevention device.

[Explanation of symbols]

1 Lifting device 5 Guide winch 2 Frame 5a Guide wire 3 Cage 5b Movable sheave 3b Guide block 5c Fixed sheave 3c Sliding hole 6 Counterweight 4 Lifting winch 6a Weight block 4a Wire 6b Pulley 4b Sheave 6c Pulley

Claims (3)

[Claims] 1. A frame installed on the ground facing a vertical shaft, a wire connected to an elevating winch provided in the frame for feeding and winding, and a wire suspended from the wire and lowered into the vertical shaft. And a cage that moves upward to the outside, and a guide wire that is fed out and wound up from a guide winch provided in the frame, and landed on the bottom of the shaft connected to the guide wire. And a counterweight, wherein the guidewire is slidable in a substantially vertical direction in the cage, and the cage is provided with a guide block capable of restraining the posture of the cage together with the guidewire. 2. The guide wire is a U-shaped loop that drops from the frame into the shaft to form two tracks in the vertical direction, and the guide block is provided for each of the two guide wires. The lift device for a vertical shaft according to claim 2, wherein the lift devices are connected to each other. 3. The lift device for a vertical shaft according to claim 2, wherein the guide blocks are provided at at least two upper and lower positions with respect to each of the two guide wires.