JPH0344800Y2 - - Google Patents

Description

[Detailed explanation of the invention] This invention was developed to prevent emergencies from occurring on the elevating work platform used when constructing the reinforcing bars from below into the drilled hard holes when excavating earth and sand from the ground surface to create foundation columns. This invention relates to an emergency stop device for the lifting work platform used in deep foundation column construction, which is activated when the ground is heated.

In general, reinforcing framework work for concrete pouring inside this type of hard hole uses a lifting ladder installed vertically inside the hole, and metal or Generally, wooden scaffolding width boards are erected one after another at the locations where they will be used, and reinforcing bars are assembled while riding on these scaffolding width boards. However, in this case, there is no fence on the scaffold, so
It has the disadvantage that it is easy to fall down and cause serious injury, and because the scaffolding width boards have to be moved vertically or horizontally to change the location, it is very troublesome and has poor workability, and it takes a lot of time to construct. There is a drawback to that.
As a solution to this drawback, there is a method in which a guide post is installed vertically in a hard hole to raise and lower the scaffold work platform, but this is because the scaffold work platform is suspended with a hanging rope, etc. An emergency safety device is absolutely necessary in case the hanging rope breaks during lifting.

This invention is an improvement of the safety stop device for the lifting platform used for scaffolding used in the construction of such deep foundation columns, and its purpose is to reliably prevent danger and ensure that workers can feel at ease. In a deep hole,
This enables rebar framework work to be carried out reliably and quickly. The main structure is a turret frame installed at the top of a circular, vertically excavated hole.
In the emergency stop device for the elevating work platform in the construction of deep foundation pillars, in which the elevating work platform is fitted to the main guide pillar suspended from the turret frame so as to be able to rise and fall freely, the main guide pillar is connected to several connecting rods. At the same time, suspending holes are bored at intervals in the connecting rod. The elevating workbench has a guide tube erected approximately in the center, and an automatic stop device is installed inside the guide tube. This automatic stop device accommodates a pressing cam that presses a spring, and rotatably locks a hanging rod provided with a hook that is movable by the pressing cam. When the hanging rope is cut, the hook stops engaging with the hanging hole provided in the connecting rod. Therefore, according to this invention, even if the suspension rope of the work platform that goes up and down in the hole breaks, the work platform will be reliably suspended from the main guide pillar, which will prevent accidents such as falling and improve safety. This has the effect of allowing you to work carefully and ensuring that the foundation pillars are built quickly and reliably.

Next, an embodiment of this invention will be described with reference to the drawings.
A circular elevating work platform 1 that rises from below inside the
This has a foot plate 24 provided with a circular protective fence 25, and a rectangular guide cylinder 5 having a penetrating interior is erected in the center of the foot plate 24. An automatic stopper 2 is fixed to the inner wall of one side of the guide cylinder 5. The main guide column A for raising and lowering the lifting work platform 1 is suspended and fixed to the horizontal frame 16 of the tower frame 4 installed at the upper part of the hard hole 28, and several connecting rods 3, 3...
It is constructed by sequentially arranging ... in the vertical direction.

Next, in the automatic stopper 2, a pressing cam 7 with an inclined tip for vertical movement is housed in a case 6 which is open at the front and rear, and a spring 8 is wound around the outside to constantly press the pressing cam 7 downward. It has been done. The pressing cam 7 is equipped with a moving rod 22 that slides in a sliding groove 21 bored in the case 6.
An end of a lifting rope 19 for lifting and supporting the lifting workbench 1 is connected to the upper part of the lifting rope 19. Further, a hanging rod 9 provided with a hook 10 at the lower end of the case 6 is rotatably fixed by a rotating shaft 23, and the upper part of the hanging rod 9 is located in a state of being joined to the lower end of the pressing cam 7. . Next, each connecting rod 3 of the main guide pillar A has an H-shaped cross section, and suspension holes 12 are bored in the partition wall 11 at predetermined intervals, into which the hanging claws 10 of the hanging rods 9 engage. It is mandatory. In addition, the connecting portion 13 of the connecting rods 3, 3
, various connecting fittings 14 are attached to bolts and nuts 27.
They are removably connected. 15 is horizontal frame 1
6 and 16 are shown, and 17 is a main hand winch which is installed above the guide cylinder 5 together with a spare sub hand winch 18. A hanging rope 19 is wound around the main and sub-hand winches 17 and 18, and the lifting rope 19 is attached to the lifting work platform 1 via a hanging wheel 20 suspended from a horizontal frame 16, etc. located at the upper part of a hard hole 28, respectively. are arranged in succession so that they can be raised and lowered freely.

This invention consists of the above-mentioned structure, and now to explain how to use this elevating work platform and emergency stop device, after confirming the pile core at the excavation position, assemble the turret frame 4,
The excavation will be carried out vertically in a circular shape, and the planks will be erected sequentially from the top in the circumferential direction, rings will be attached and fastened with bolts and round pins, and the earthen wall will be lowered one after another while being fixed, and the excavation will begin. Excavation is completed when the bottom of the ground is reached. Thereafter, the connecting rods 3, 3 are sequentially connected upward with connecting fittings 14, 14 from the bottom, and the guide cylinder 5 of the suspended lifting work platform 1 is fitted onto the connecting rods 3, 3. do. At this time, the connecting rod 3,
3 is attached to the horizontal frame 16 of the turret frame 4 with a hanging fitting or the like so that it can be raised or detached.

Next, when framing reinforcing bars (not shown) from the bottom of the hard hole 28, the worker places concrete on the lifting platform 1 located at the lower end of the main guide column A and pours concrete in order from the frame. As concrete pouring progresses, the concrete plates and rings are dismantled and removed from the bottom, the main guide pillar A is pulled up, the connecting rods 3 and 3 at the top are sequentially removed, and at the same time, the lifting work platform 1 is also removed. A hand winch 17 is used to gradually construct concrete foundation columns at the bottom while raising the column.

When the suspension rope 19 of the lifting work platform 1 is cut during the construction of such a foundation column, the automatic stopper 2 provided inside the guide cylinder 5 is activated. That is, when the hanging rope 19 is cut, the pressing cam 7 connected to the hanging rope 19 is pushed downward by the restoring force of the spring 8 as shown in FIG. 9 is moved by the rotating shaft 23 by pushing the head. Next, the hook 10 at the tip of the movable hanging rod 9 is inserted into the hanging hole 12 of the connecting rod 3 and locked, and the lifting work platform 1 is stopped by the main guide column A to deal with an emergency situation. It is.

As described above, according to the emergency stop device of this invention,
It has the effect of reliably protecting the safety of the elevating work platform used for creating deep foundation columns and preventing dangers such as falling. Therefore, there is an effect that reinforcing bar framework work in hard holes can be carried out efficiently and quickly. Since the main guide pillar is connected to several connecting rods, it has the advantage that it can be used by freely attaching and detaching it, regardless of the length of the deep layer. Furthermore, since the hanging holes provided at predetermined intervals of the connecting rod are bored in the partition wall of the connecting rod, there is an effect that the hanging rod of the automatic stop device is always engaged.
In addition, the automatic stop device installed inside the guide tube that stands up on the lifting workbench is housed inside the main guide column and goes up and down, so it does not get in the way and is extremely convenient, as well as being extremely convenient. It has the effect of sufficiently dealing with damage. Furthermore, since the automatic stop device houses a pressing cam that is pressed by a spring, when the hanging rope breaks, a restoring force is applied accurately to ensure that the hanging rod located below is pressed and rotated. Since it has a simple structure that only requires pressing a spring, there is no damage or malfunction. In addition, the hook provided at the top of the hanging rod reliably engages with several hanging holes drilled in the connecting rod, and also fully fulfills the role of suspending the lifting work platform from the main guide column. It has a huge effect. Furthermore, since the main hand winch and the sub hand winch are each wrapped with a hanging rope, even if one breaks down, the other winch can be used to adjust the lifting and lowering accordingly, which is extremely convenient. During disassembly, the removal position of the connecting rod can be easily selected and the work can be conveniently carried out by sequentially lifting the rod.

[Brief explanation of drawings]

The drawings show an embodiment of this invention. Fig. 1 is a vertical sectional front view of the entire device with some parts removed, Fig. 2 is an enlarged sectional view of the main part, and Fig. 3 is a cross-sectional view of the workbench. FIG. 4 is a top view, FIG. 4 is a slope view, and FIG. 5 is a perspective view showing a state in which the connecting rods are connected and partially cut out.
FIG. 6 is a side view of the automatic stop device in a normal state, FIG. 7 is a side view of the automatic stop device in a stopped state in an emergency, and FIG. 8 is a partially cutaway front view of the stop device. Symbol A is the main guide pillar, 1 is the lifting work platform, 2 is the automatic stopper, 3 is the connecting rod, 4 is the turret frame, 5 is the guide cylinder,
6 is a case, 7 is a pressing cam, 8 is a spring, 9
10 is a hanging rod, 11 is a bulkhead, 12 is a hanging hole, 14 is a connecting fitting, 17 is a main hand winch, 1
8 is an auxiliary hand winch, 19 is a hanging rope, 20 is a hanging wheel, 21 is a sliding groove, 24 is a foot plate, and 28 is a hard hole.

Claims (1)

[Scope of utility model registration request] A circular elevating work platform 1 that ascends from below inside a circular vertically excavated hard hole 28 of various sizes has a foot tread 24 provided with a circular protective fence 25. A rectangular guide cylinder 5 with a penetrating interior is erected in the center of the guide cylinder 24, and an automatic stopper 2 is fixed to the inner wall of one side of the guide cylinder 5, and a guide for raising and lowering the lifting work platform 1 is installed. The main pillar A is connected by several connecting rods 3, 3, and the upper end of the connecting rod 3 is always fixed to the horizontal frame 16 of the turret frame 4 installed in the upper part of the hard hole 28, and the automatic stopper 2 has a pressing cam 7 for vertical movement with an inclined tip inside a case 6 which is open at the front and rear, and a pressing cam 7 on the outer periphery of the pressing cam 7.
The spring 8 that constantly presses the
The upper end of the pressing cam 7 is connected to the end of a hanging rope 19 that lifts and supports the lifting workbench 1, and the pressing cam 7 is provided with a moving rod that slides in a sliding groove 21 formed in the case 6. 22, a hanging rod 9 provided with a hook 10 is rotatably fixed to the lower end of the case 6 by a rotary shaft 23, and is in contact with the lower end of the pressing cam 7. Each connecting rod 3 has an H-shaped cross section, and the H-shaped partition wall 11 has a suspension hole 12 at a predetermined interval, into which the hook 10 of the suspension rod 9 engages.
12, and the connecting portion 13 of the connecting rods 3, 3.
The connecting fittings 14 are removably connected to each other using bolt nuts 27, 27, and a main hand winding winch 17 and a sub hand winding winch 18 are connected to the upper part of the guide cylinder 5.
An emergency stop device for an elevating work platform in the construction of deep foundation columns, characterized in that the main and sub-hand winches 17 and 18 are wound with hanging ropes 19 and 19, respectively.