JPH01220696A - Device of stabilizing unloading work for multistoried structure - Google Patents

Abstract

PURPOSE:To improve efficiency of unloading work and to improve safety thereof by suspending a pulley having a weight on a looseness portion provided at a part of a messenger wire and controlling tension of the messenger wire. CONSTITUTION:In case of sequentially letting out a messenger wire 2 with the movement of a jig crane 1, compensation is done by decreasing the amount of looseness of a looseness portion 19 suspended and supported by a pulley 20. Tension at that time is kept by the weight of a weight 21 suspended at the looseness portion 19. As the weight 21 is suspended by the wire 2 through the pulley 20 and the looseness portion 19 itself of the wire 2 is supported by the pulley 20, the wire 2 can be smoothly let out by rotating action of the pulley 20. Thus, work for preventing over-lifting of the jig crane 1 and over tension of the messenger wire 2 is very insignificant, so that the safety and work efficiency of unloading work can be improved greatly.

Description

[Detailed description of the invention] (Industrial application field) The present invention stably holds the unloading wire of the unloading machine,
Concerning a stabilizing device for unloading operations to ensure the safety of lifting operations, this stabilization device is useful for unloading machines that move upward in an integral manner, especially when the structure under construction is gradually built upwards. Regarding.

(Prior art) For example, when constructing high-rise structures such as water towers, communication towers, chimneys, and other high-rise towers, the sliding form construction method is often used, and as the structures are built upward, The light lifting jib crane also rises upwards.

In order to prevent the crane's unloading wire from swinging sideways, the tip of the wire unwound from the winch on the ground (the end of the wire) is attached to the top of the structure under construction, and is used as a metsenger wire to guide the unloading wire.
The wire is fed out from the winch drum according to the progress of the structure while maintaining a constant tension with the winch.

(Problem to be Solved by the Invention) However, since the metsenger wire directly connects the winch drum and the structure, when the formwork is raised, some of the wire is loosened and then re-strung. Therefore, no lifting work was carried out when the formwork was raised.

In addition, the force of the winch will directly act as a load on the top attachment part of the structure being constructed through the wire, which is dangerous, so be careful not to over-tighten the wire, and workers should be careful about the tension of the wire. While doing so, he marked the wire and determined the tension by feel.

In view of the above circumstances, the purpose of the present invention is to simply configure a mesh wire to which a constant tension is automatically applied not only when the formwork is raised, but also at all times, thereby increasing the efficiency and safety of unloading work. The purpose of the present invention is to provide a stabilizing device for unloading operations.

(Means for Solving the Problems) In order to achieve the above object, a stabilizing device for unloading work for high-rise structures according to the present invention is installed at the top of a high-rise structure under construction, and the structure is In a metsenger wire that is suspended from the base of the unloading machine to a lower traction winch and guides the lower end of the unloading wire of the unloading machine, it moves upward as the unloading machine is constructed. Forming a slack supported by a pulley so as to sandwich a part of the metsenger wire on the way to the winch,
By suspending a pulley with a weight suspended from this slack portion, the tension of the metsenger wire is adjusted by the weight. In addition, in order to prevent overwinding of the unloading machine and protect the unloading wire, a detector is installed at the upper end of the unloading wire to determine the upper limit position of the unloading wire, and the output signal of the detector is used to detect the unloading wire. This prevents over-winding. Furthermore, in order to maintain the tension of the messenger wire constant, a detector for detecting the upper limit position of the pulley on which the weight is suspended is installed above the slack part of the messenger wire, and the pulley moves to the upper limit position. When this happens, the Messenon Yar wire is unwound from the winch based on the output signal of the detector.

(Function) The height of the structure increases as construction progresses, and the distance between the unloading machine and the traction winch increases.

Therefore, when the metsenger wire is paid out one after another as the unloading machine moves, the amount of slack in the slack portion supported by the pulley is reduced and compensated for.

The tension at that time is maintained by the weight of a weight suspended on the slack part, and this weight is suspended on the wire via a pulley, and the slack part of the wire itself is also supported by the pulley, so the wire cannot be fed out. This is done smoothly by the rotating action of the pulley.

If the unloading wire of the unloading machine is hoisted too much, the Metsusenger wire will be pulled up, so in order to prevent this, a detector detects the upper limit of the unloading wire, and the detector starts the hoisting operation at the upper limit position of the unloading wire. Stop.

In addition, the movement of the formwork as the structure is completed upwards,
In other words, when the movement of the unloading machine exceeds the amount of slack in the metsenger wire, the pulley on which the weight is suspended reaches its upper limit position, and the wire is unwound from the winch in response to the change in the signal of the detector, maximizing the amount of slack. do. then,
Since a weight is suspended from the slack part of the Metsenger wire, the tension remains constant.

(Embodiments) Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows the entire jib crane 1 and its metsenger wire 2 from the side. In the figure, when the pedestal 3 of the crane 1 lifts up the weir plate 6 of the sliding form construction method assembled to construct the outer wall 5 of the tower-like structure 4, the jib crane 1 also moves upward together.

The mesh wire 2 is wound and tensioned in a straight line from the pedestal 3 to the winch 7 on the ground via the tension adjustment section.

As shown in FIG. 2, the unloading hook 9 suspended from the lower end of the unloading wire 8 of the jib crane 1 has a shackle 10 attached to its side, and a shackle 10 and a shackle 10 are attached to the side of the unloading hook 9 which is suspended from the lower end of the unloading wire 8 of the jib crane 1. are connected by a wire 12.

As the unloading hook 9 moves up and down, the pulley 11 moves up and down the metsenger wire 2, and the wire 12 and the pulley 11 keep the lateral swing of the unloading hook 9 within a certain limit.

A limit switch 13 is fixed to the upper end of the metsenger wire 2, and a metsenger catch pulley 1
If 1 is hit, the switch 13 is activated (ON). When this switch 13 is turned on, the jib crane 1 stops hoisting the unloading wire 8, making further hoisting impossible.

Next, the tension adjustment portion of the Metsenger wire 2 will be explained with reference to FIG.

The lower part of the Metsenger wire 2 hanging down from the pedestal 3 is guided to a tension adjustment tower located at a distance from the outer wall 5 of the tower-like structure 4 through a sheave 14 installed on the ground. This is to adjust the

That is, the lower part of the metsenger wire 2, which is stretched almost vertically along the outer wall 5 with the Tsuzumi-type sheave 14, is further turned horizontally, and the tension adjustment tower body is moved to the outer wall so that the unloaded cargo does not hit the tension adjustment tower. Isolated from 5.

This tower consists of suspended sheaves 17-17 suspended at regular intervals on beams 16 passed between the tops of columns 15-15, and
5-15 and guide sheaves 18-18 fixed to each base.

The mesh wire 2 is guided by the sheave 14 toward the guide sheave 18 of the support column 15, and further guided by the guide sheave 18 toward the suspension sheave 17, and this guide sheave 1
7, turn the hook and lower it once in the vertical direction to form a U-shaped slack part 19, then turn the hook again toward the other suspension sheave 17, and move it downward while following the upper side of this sheave 17. It is wound from the inside of the guide sheave 18 at the base of the other support column 15 to the lower side, and is wound and locked to the winch 7.

Then, a pulley 20 is placed on the slack part 19, and this pulley 20
A weight 21 for tension adjustment is suspended from the. weight 2
1, the heavier the crane, the stronger the tension, but this tension is
It is determined by the weight of the load to be lifted, so 0 to 1000k
Select within a range of about 100 g.

The vertical length of the slack portion 19 is approximately 1 m. This is because the amount of rise of the weir plate 6 is about 6 m per day. Further, from the point of view of work safety, a slack portion 19 of approximately 1 m is sufficient.

As the frame 3 of the crane 1 moves upward, the Messenger wire 2 is pulled out from the slack part 19 while pulling the weight 12 upward, and when the pulley 20 suspending the weight 21 reaches the upper limit position, Tension adjustment tower beam 1
The switch 22 attached to 6 is activated. The switch 22 may be used to sound an alarm and the winch 7 may be operated manually, or the wire may be automatically unwound from the winch 7 in conjunction with the switch 22.

Of course, the winch 7 may be operated by visually observing the movement status of the pulley 20 without providing the switch 22.

In addition, a switch 23 is installed near the bottom of the unwinding wire of the winch 7 to detect slack in the wire between the guide sheave 18 near the winch 7 and the winch 7. may be automatically controlled.

(Effects) Since the present invention is configured as described above, even if the unloading machine moves upward by the sliding form construction method,
Since a part of the Metsenger wire is slackened and a weight is suspended from this slack part, the Metsenger wire can be fed out while maintaining a constant tension determined by the mass of the weight. Therefore, there is no need to unwind and loosen the wire from the winch before raising the weir plate, so the unloading work can be carried out continuously and efficiently. That is, there is no need for tension adjustment work such as re-stretching the metsenger wire.

In addition, a pulley is used to loosen the metsenger wire and suspend the weight, so that the resistance to feeding out the metsenger wire is extremely small, and the weight can be moved up and down smoothly.

Furthermore, if a detector is installed at the upper limit position of the weight, it will automatically detect when there is no slack and the wire can be unwound from the winch in response, so that the metsenger wire will not be subject to the direct tensile load caused by the rise of the weir plate. There is no need to worry about this happening, and work safety can be guaranteed. Similarly, providing a switch at the upper end of the metsenger wire has the effect of preventing the danger of the connector connecting the unloading wire of the unloading machine to the metsenger wire being pulled up due to overwinding of the unloading wire.

Therefore, the work required to prevent the unloading machine from overlifting, the metsenger wire from being overtensioned, etc. becomes extremely light, and the safety and work efficiency of the lifting work are dramatically improved.

[Brief explanation of the drawing]

The figures show an embodiment of the present invention; FIG. 1 is a side view showing the whole, FIG. 2 is a side view showing the upper end of the Messenger wire in FIG. 1, and FIG. It is a side view which shows a part. 1...Jib crane 2...Metsenger wire 3...
Frame 4... Tower-like structure 5...
...Outer wall 6...Weir board 7...
... Winch 8 ... Unloading wire 9 ... Unloading hook 10 ... Shackle 11 ... Metsenger catch pulley 12 ...
・Wire 13...Switch 14...Tsut type sheave 15...Support 16...Beam
17... Suspension sheave 18... Guide sheave 19... Slack portion 20... Pulley
21... Heavy Li 22... Switch 2
3...Switch patent applicant Co., Ltd.
Kumiyoshi Obayashi Patent Attorney - Ken Iro Rinma Patent Attorney Masatoshi Matsumoto 2nd
figure

Claims (3)

[Claims] (1) The unloading machine is installed at the top of the high-rise structure under construction and moves upward as the structure is built upwards.The unloading machine is suspended from the base of the unloading machine to a traction winch below. In the messenger wire that guides the lower end of the unloading wire, a slack is formed on the way from the base of the unloading machine to the winch by supporting it with a pulley so as to sandwich a part of the messenger wire, and a weight is attached to this slack part. A stabilizing device for unloading work for high-rise structures, characterized in that the tension of the messenger wire is adjusted by the weight by suspending a suspended pulley. (2) A high-rise building according to claim 1, characterized in that a detector for determining the upper limit position of the unloading wire is installed at the upper end of the messenger wire, and the output signal of the detector prevents overwinding of the unloading wire. Stabilization device for structural unloading operations. (3) A detector for detecting the upper limit position of the pulley on which the weight is suspended is installed above the slack part of the messenger wire, and when the pulley moves to the upper limit position, the output signal of the detector detects the messenger wire from the winch. The stabilizing device for unloading work for high-rise structures according to claim 1, characterized in that the device unwinds a wire.