JPH09290991A - Weight suspending device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify a structure and to eliminate a large electric motor by horizontally suspending a horizontal member with a support point of an apex of two wires mounted to the horizontal member for mounting a hoisted heavy matter and by adjusting the length of the wire near a counter weight while holding the length of the wire 4 near the heavy matter when the center of gravity is moved by mounting the heavy matter. SOLUTION: In a state before mounting a hoisted heavy matter, a horizontal member 1 can be horizontally held by determining the length of wires 3, 4 so that a point of intersection S is positioned directly above the center of gravity C of the horizontal member 1. The heavy matter is mounted to the horizontal member 1 from this state, the center of gravity is moved to the side of the weight and the horizontal member 1 is apt to tilt to the side of the heavy matter. Then, the length of the wire 3 is adjusted by an electric chain block 5 while holding the length of the wire 4 at a specified length to move the point of intersection of wires 3, 4, whereby the horizontal member 1 can be balanced in to and fro directions. Therefore, the horizontal member 1 can be always held horizontally with a simple structure and the heavy matter is suspended horizontally.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to lifting equipment for horizontally lifting a temporary scaffold or the like in a high-rise building.

[0002]

2. Description of the Related Art Conventionally, precast prestressing work, which is one of the prefabricated construction methods, has been actively performed in order to shorten the construction period and save labor in high-rise buildings. In particular, recently, a method of constructing a beam with a slab using a precast member has been adopted when constructing a part such as a balcony or a corridor that projects from a building. Briefly explaining the process, if the precast member is completely fixed on a certain floor, another precast member is attached to the upper floor and a supporting structure is temporarily installed between the two so that the precast member on the upper floor does not fall off. So keep supporting. After that, every time the fixing of the precast member is completed, the support work is diverted to the upper floor. In this way, since the precast member on the upper floor that is supported by the support work can be used as a scaffold for work, conventionally,
This has brought about a great advantage that it is possible to eliminate the use of the frame scaffolding, which has been troublesome in disassembling and assembling (no scaffolding method).

[0003]

By the way, when the supporting work is diverted to the upper floor, a means for hoisting the supporting work horizontally so as not to contact the precast member is indispensable. Therefore, conventionally, the supporting equipment (a) has been hoisted by using hoisting equipment as shown in FIG. That is, this lifting equipment is one in which a counterweight (c) is slidably attached to a horizontal member (b), and by supporting the counterweight (c) by sliding the counterweight (c) in accordance with the center of gravity of the horizontal member (b), support work is carried out. The horizontal member (b) is always kept horizontal regardless of whether or not (a) is attached. However, according to this suspension equipment, it is necessary to use a large electric motor to slide a counterweight of a considerable weight, and there is a problem that the cost of the suspension equipment increases.

The present invention has been made to solve the above-mentioned problems, and an object thereof is to provide a hoisting-lifting facility which simplifies the structure and does not require a large electric motor.

[0005]

In order to achieve the above object, according to the present invention, a counterweight is provided in the front part, and a horizontal member on which a lift can be mounted is provided in the rear part, and two horizontal members are attached to the horizontal member. The horizontal member is suspended horizontally with the apex of the triangle formed by
With the movement of the center of gravity when a heavy object is attached to the horizontal member, the length of the wire closer to the counterweight is adjusted while the wire closer to the heavy object among the wires is kept at a constant length. The method of balancing the front and back was used.

According to the above means, the horizontal member can be regarded as a suspension balance, and before mounting a lifting object such as a supporting member on the horizontal member, the apex of the triangle, that is, the fulcrum is located directly above the center of gravity of the horizontal member. The horizontal member can be kept horizontal by arranging at the position. Next, when a lifting object is attached to the horizontal member, its center of gravity moves to the lifting object side, but at this time, while keeping the wire near the lifting object at a constant length, the length of only the wire near the counterweight is adjusted. By making the length longer, the apex of the triangle can be positioned right above the center of gravity after the movement, and the front and rear of the horizontal member can be balanced. The means for adjusting the length of the wire closer to the counterweight in the present invention includes all conventionally known means, and specifically, it can be performed by an electric chain block or a winch.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be described below with reference to FIGS. FIG. 1 shows the entire suspension equipment according to the present invention. The structure is such that a counterweight 2 is provided in the front part, a lift member Y is attachable to the rear part, and a horizontal member 1 is provided at a predetermined interval before and after the horizontal member 1. The wires 3 and 4 attached in step 3 form a triangle, and the wire 3 near the counterweight among the wires 3 and 4 is configured to be adjustable in length by the electric chain block 5. Then, with the intersection S of the wires 3 and 4, that is, the apex of the triangle as a fulcrum, the hanging metal fitting 6 is hung on the intersection S and the horizontal member 1 is lifted by a crane (not shown).

Next, the operation principle of the hoisting equipment having the above structure will be described. First, in the state before the lifting object Y is mounted on the horizontal member 1 (see FIG. 1), the intersection point S is the center of gravity C of the horizontal member 1.
The horizontal member 1 can be held horizontally by determining the lengths of the wires 3 and 4 so as to be located right above. When the lifting object Y is attached to the horizontal member 1 from this state, the center of gravity C ′ moves to the lifting object Y side, so that the horizontal member 1 tends to lean toward the lifting object Y. Therefore, the length of the wire 3 is adjusted by the electric chain block 5 while keeping the wire 4 at a constant length, and the intersection point S ′ of the wires 3 and 4 is positioned directly above the center of gravity C ′ after the movement, whereby a horizontal member is obtained. The balance before and after 1 can be obtained (see FIG. 2).

That is, when the center of gravity of the horizontal member 1 is located between the wires 3 and 4 of the horizontal member 1, that is, on any of the bases of the triangle, the length of the wire 3 near the counterweight 2 is adjusted. As a result, the horizontal member 1 can always be hung horizontally regardless of whether or not the lifted object Y is attached. At this time, how much the wire 3 is unwound can be obtained by calculating the lever ratio if the weight of the lifting object Y is known.

[0010]

As described above, according to the present invention,
Even with a simple structure, the horizontal member regardless of the presence or absence of the lifted object can always be kept horizontal, and the lifted object such as the support work can be hoisted horizontally. Further, the counterweight may be made of concrete lumps or steel frames that are no longer needed at the site, which can reduce the cost of the hanging equipment and at the same time contribute to the utilization of waste. At this time, the weight of the counterweight will vary slightly depending on the site,
With the function of adjusting the length of the wire closer to the counterweight, fine adjustment is possible regardless of the weight of the counterweight. Furthermore, the wire length can be adjusted using an electric chain block that can be easily prepared by leasing, etc.
Precast work can be performed at an extremely low cost compared to the conventional method.

[Brief description of drawings]

FIG. 1 is a side view before mounting a heavy object showing an embodiment of the present invention.

FIG. 2 is a side view of the same after mounting a heavy object.

FIG. 3 is a side view showing a conventional technique.

[Explanation of symbols]

 1 horizontal member 2 counterweight 3 wire (adjustable length) 4 wire (fixed length) 5 electric chain block 6 hanging bracket

Claims (1)

[Claims] 1. A counterweight is provided on the front part,
The horizontal member is horizontally hung on the apex of a triangle formed by a horizontal member on the rear of which a load can be attached and two wires attached to the horizontal member, and the horizontal member is lifted on the horizontal member. With the movement of the center of gravity when an object is attached, among the above wires, the wire near the lifted object is kept at a constant length, and the length of the wire near the counterweight is adjusted to balance the front and rear of the horizontal member. Lifting equipment for lifting.