JP3336788B2 - Lifting apparatus and lifting method for large structures - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lifting apparatus and a lifting method used for performing a work for installing a large structure, and more particularly to a lifting apparatus and a lifting method suitable for lifting a large structure which is low in rigidity and easily deformable. It is about the method.

[0002]

2. Description of the Related Art FIG. 3 is a schematic view showing an example of a conventional large-structure lifting apparatus. As shown in the drawing, the lifting device 21 includes a balance 23 formed of a steel material having a length substantially equal to the entire length of the large structure serving as the suspended load 22, a lifting wire 24 attached to upper ends of both ends of the balance 23,
It consists of a pair of suspended load wires 25 attached to the lower ends of both ends of the balance 23, and a mounting bracket (not shown) such as a shackle attached to the lower end of each suspended load wire 25.

Conventionally, the work of installing a large structure using the above-described lifting device 21 has been performed by the following lifting method. First, the mounting bracket at the lower end of the suspended load wire 25 is engaged with a gate-shaped mounting jig 26 fixed to the suspended load 22, and the lifting wire 24 is hooked on a hook 27 suspended from a heavy machine such as a crane.

[0004] Next, the take-up wire 28 of the heavy equipment is wound up, the suspended load 22 is lifted through the lifting device 21, and the boom is swung or extended to move the suspended load 22 upward to the installation position. Then, the take-up wire 28 is unwound and the suspended load 22 is seated at the installation position, and is temporarily placed or temporarily attached.

[0005]

The conventional apparatus and method for lifting large structures have high rigidity and are suitable for the installation work of the suspended load 22 which is difficult to deform, but has low rigidity and is easily deformable. There was a problem that it was not suitable for installation work of the load 22.

[0006] That is, the thickness is 5 m like a roof plate of a tank.
When a thin plate of about m to 8 mm is lifted, the roof plate is easily bent and deformed, and the curvature given in advance is impaired.

In particular, as shown in FIG.
Assemble the gantry 30 and the roof raft on the bottom 29a of the
When the roof plate as the suspended load 22 is temporarily attached along this, it is necessary to incline the roof plate 24 in accordance with the curvature of the gantry 30, but in the above-described lifting device 21 and the lifting method, the roof plate 24 is tilted. It was virtually impossible to lift it.

In such a case, the roof plate 24 can be inclined by changing the length or the hanging point of the suspended load wire 25. However, since the inclination angle is not variable, it is not suitable for installation work on site.

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to lift a large structure that can be slanted and lifted without deforming the large structure during installation work of a large structure that is low in rigidity and easily deformable. An object is to provide an apparatus and a lifting method.

[0010]

In order to achieve the above object,
The lifting device for a large structure according to the present invention is a lifting device for a large structure in which a suspended load is lifted by being interposed between a hook fed from a heavy machine and a suspended load which is a large structure, and the lifting load is seated at an installation position. In the lifting device, a balance formed of a material having sufficient rigidity to support the large structure,
A plurality of suspended load wires of the same length that are suspended from the balance and connected to the suspended load, a lifting wire that extends over one end and the center of the balance, and an intermediate portion of the lifting wire are supported. A pulley, a first hook for lifting the pulley, and a staying wire loosely connected between the other end of the balance and a first hook;
A second hook is extended from the heavy equipment separately from the first hook, and is used to suspend the other end and tilt the balance.

In the construction of the lifting device, the suspended load wires are suspended on the balance by a sufficient number to prevent bending of a large-sized structure.

Further, in the method of lifting a large structure according to the present invention, a lifting device is hung on a hook fed out from a heavy machine, a lifting load as a large structure is lifted via the lifting device, and the lifting position is set. In the method of lifting a large structure to be seated on a pulley, a pulley that supports an intermediate portion of a lifting wire that is bridged between one end and a central portion of the balance constituting the lifting device is lifted by a first hook, and The first hook and the other end of the balance are extended and loosely connected by a stay wire, and the other end is lifted by the second hook to tilt the balance.

In the above construction of the lifting method, the large-sized structure is suspended from the balance by a suspended load wire having a sufficient number of wires for preventing bending and having the same length.

[0014]

According to the construction of the lifting device, a suspended load, which is a large structure, is suspended from the balance by a plurality of suspended wires. A pulley that supports a central portion of a lifting wire that is bridged between one end and a central portion of the balance is lifted by a first hook pulled out from a heavy machine such as a crane. On the other hand, a stay wire extending from the first hook through the other end of the balance is loosely connected. The second hook is lifted at the other end of the balance via a hanging wire. As described above, the lifting wire, the lifting wire, and the holding wire are lifted by the first hook and the second hook, so that the suspended load supported by the balance is suspended.

In this state, when the first hook is raised, the rising movement of the first hook is restricted by the restraining wire, so that the balance is inclined with the other end of the balance as a fulcrum, and the balance is suspended from the balance. The suspended load will also be inclined.

Further, if a plurality of hanging load wires are suspended on the balance with the same length enough to prevent the bending of the large-sized structure, the large-sized structure having low rigidity and being easily deformed can be deformed without being deformed. It can be lifted by being inclined in accordance with a desired inclination angle.

On the other hand, according to the construction of the above-mentioned lifting method, first, the first hook pulled out from a heavy machine such as a crane or the like, the lifting wire extended over one end and the center of the balance constituting the lifting device. Hoist the pulley that supports the center of the car. At the same time, the stay wire extending through the other end of the balance is lifted. Further, the other end of the balance is lifted by the second hook via the hanging wire. Further, the other end of the balance is lifted by the second hook via the hanging wire. In this way, the lifting wire and the holding wire are lifted by the first hook and the second hook, and the suspended load supported by the balance is suspended. Next, when the first hook is raised, the upward movement of the first hook is restricted by the restraining wire, and the balance is tilted with the other end of the balance as a fulcrum, and the suspended load suspended on the balance is inclined. Is also inclined. Next, the boom of the heavy equipment is swung or expanded and contracted to
And the second hook are moved to position the suspended load above the installation position.

Further, when lifting the large-sized structure,
If a large structure is suspended from the balance with the same number of hanging load wires of sufficient length to prevent its deflection, a large structure with low rigidity and easy deformation can be formed at a desired inclination angle without deformation. It can be lifted by being inclined together.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a lifting apparatus and a lifting method for a large structure according to the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 is a schematic view showing one embodiment of a large structure lifting apparatus according to the present invention. As shown
The lifting device 1 of the present embodiment is interposed between a large structure 4 and a hook 2 attached to a winding wire 15 and a hook 3 attached to a winding wire 17 that are fed out from a heavy machine such as a crane. To lift the large structure 4.

The balance 5 which is the main body of the lifting device 1
It is formed of a material having sufficient rigidity to support the large structure 4, for example, an H steel material or a channel steel material. The balance 5 has a length substantially equal to the entire length of the large structure 4. In this embodiment, since the roof plate of the tank is adopted as the large structure 4, the scale 5 is adjusted to the curvature of the roof plate. The lower surface is formed in a curved concave shape.

A plurality of suspended load wires 6 are suspended from the lower surface of the balance 5. In this embodiment, one pair is provided at both ends and the center of the lower surface of the balance 5 for a total of 6
The hanging load wires 6 are suspended, and the hanging wires 6 having the same length are used. A mounting bracket (not shown) such as a shackle is attached to the lower end of each hanging load wire 6. The mounting bracket is a gate-shaped mounting jig 7 temporarily attached to the large structure 4 as a roof panel. Is engaged.

In the present embodiment, the balance 5
Although the suspended load wires 6 were suspended, the number is not limited to the number, and the number and suspension points sufficient to prevent bending of the large structure 4 such as a roof plate of a tank are appropriately calculated and set by an electronic computer. Is done. Further, in the present embodiment, the mounting bracket attached to the lower end of each hanging load wire 6 is configured to be engaged with the mounting jig 7 temporarily attached to the large-sized structure 4, but is not limited thereto. Not the mounting jig 7
Each hanging load wire 6 may be directly engaged.

A lifting wire 8 that is sufficiently longer than the space between these ends is wrapped around one end and the center of the upper surface of the balance 5. That is, one end of the lifting wire 8 is attached to the mounting bracket 9 at one end of the upper surface of the balance 5,
The other end is attached to a mounting bracket 10 at the center of the upper surface of the balance 5. The center to intermediate portion of the lifting wire 8 is supported by a pulley 11, and the pulley 11 is lifted by a first hook 2 fed from a heavy machine such as a crane. In this embodiment, two heavy machines are used, and the first hook 2 is extended from one of the heavy machines.

The other end of the balance 5 is provided with the first
As shown by a solid line in the drawing, a stay wire 12 for regulating the maximum inclination of the balance 5 is connected between the hook 2 and the metal fitting 13 provided at the other end of the upper surface of the balance 5. This metal fitting 13 is lifted by the second hook 3 of another heavy equipment via the hanging wire 18. The base end of the stay wire 12 is hooked on the first hook 2, and the other end is loosely connected to the mounting bracket 13 at the other end of the upper surface of the balance 5, so that the balance 5 connects the pulley 11. The wire 12 can be tilted to the center and the wire 12 restricts the maximum tilt.

In this embodiment, two heavy machines are used, and the first hook 2 and the second hook 3 are extended from separate heavy machines. However, the present invention is not limited to this. Instead, the parent hook and the child hook may be extended from one heavy machine and used as the first hook 2 and the second hook 3.

Next, the operation of the lifting apparatus 1 of the above embodiment will be described together with the method of lifting a large structure according to the present invention. The lifting method according to the present embodiment is performed using the above-described lifting device 1. First, the lifting method is extended between one end and the center of the balance 5 by the first hook 2 fed from one heavy machine. The pulley 11 that supports the central part to the intermediate part of the lifted wire 8 is lifted.

In order to tilt the large structure 4 in this state, the suspension wire 18 is pulled down by the second hook 3 fed from the other heavy machine, or the first hook 2 is lifted so that the holding wire 12 is taut. By doing so, it can be tilted to any angle.

Next, the boom of the heavy equipment is swiveled or expanded and contracted.
The first hook 2 is moved to position the inclined large structure 4 above the installation position. For example, when assembling a roof plate of an underground tank, as shown in FIG. 2, the large structure 4 is often temporarily assembled at the bottom 14 a of the underground tank 14. The large structure 4 is located directly above the bottom 14 a of the underground tank 14.

When the second hook 3 is moved up and down, the balance 5
Turns around the pulley 11 and tilts. Since each suspended load wire 6 always hangs in the direction of gravity, the balance 5, the large structure 4 and the suspended load wire 6 have a parallelogram shape as a whole, and the large structure 4 suspended on the balance 5 also has an inclination angle. Will be inclined along.

Further, in this embodiment, the large structure 4 is suspended by the number of hanging wires 6 sufficient to prevent the bending of the large structure, and the length of each hanging wire 6 Is uniform, a large-sized structure having a low rigidity and easily deformable like the large-sized structure 4 can be lifted without being deformed and inclined in accordance with a desired inclination angle.

That is, the large structure 4 can be inclined according to the inclination angle of the gantry 16 and the roof raft temporarily assembled on the bottom 14a of the underground tank 14, and the assembling work can be performed without deforming the large structure 4. It can be performed efficiently.

Further, according to the lifting device 1 and the lifting method of the present embodiment, a large structure having low rigidity and easily deformable
Since it can be moved horizontally without being deformed, and can be lifted while being tilted to a desired tilt angle, it is not necessary to temporarily place it on the tilted base 16.

[0034]

As described above, according to the apparatus and method for lifting a large structure according to the present invention, the large structure is deformed during the installation work of the large structure which is low in rigidity and easily deformable. In addition, it has an excellent effect that it can be lifted while being inclined.

[Brief description of the drawings]

FIG. 1 is a schematic view showing an embodiment of a large structure lifting apparatus according to the present invention.

FIG. 2 is a schematic view showing an assembling operation of a roof plate of an underground tank using the lifting device and the lifting method for a large structure according to the present embodiment.

FIG. 3 is a schematic diagram showing an example of a conventional large-structure lifting apparatus.

FIG. 4 is a schematic view showing an assembling operation of a roof plate of an underground tank using a conventional large-structure lifting apparatus and method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lifting device 2 1st hook 3 2nd hook 4 Hanging load 5 Balance 6 Hanging wire 7 Mounting jig 8 Lifting wire 9 Mounting bracket 10 Mounting bracket 11 Pulley 12 Standing wire 13 Mounting bracket 14 Underground tank 14a Bottom part 15 winding Take-off wire 16 Mount 17 Take-up wire 18 Hanging wire

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B66C 1/10 B66C 13/08

Claims (4)

(57) [Claims] 1. A suspended load, which is interposed between a hook fed out from a heavy machine and a suspended load which is a large-sized structure,
In a lifting device for a large structure, which is seated at an installation position, a balance formed of a material having sufficient rigidity to support the large structure, and a plurality of suspensions suspended from the balance and connected to a suspended load. A load wire, a lifting wire spanned between one end and the center of the balance, a pulley for supporting an intermediate portion of the lifting wire, a first hook for lifting the pulley, and the other end of the balance. A stay wire loosely connected therebetween, and a second hook which is fed out of the heavy equipment separately from the first hook, and suspends the other end to tilt the balance. Equipment for lifting large structures. 2. A lower surface of the balance is formed in the same shape as a structure, and the number of the suspended load wires is sufficient to prevent bending of a large-sized structure, and each of the suspended wires is suspended by the balance with the same length. The lifting device for a large structure according to claim 1. 3. A method for lifting a large structure, comprising: suspending a lifting device on a hook fed from a heavy machine, lifting a suspended load as a large structure via the lifting device, and seating the suspended load at an installation position. A pulley that supports an intermediate portion of a lifting wire bridged between one end and a central portion of a balance constituting a lifting device is lifted by a first hook, and the first hook and the other end of the balance are lifted. And lifting the other end with a second hook, and tilting the balance to lift the balance. 4. The method of lifting a large structure according to claim 3, wherein the large structure is suspended from a balance with a sufficient number of hanging load wires to prevent the bending of the large structure.