JPH07172767A - Mast dismantler of tower crane - Google Patents

Abstract

PURPOSE:To perform the mast removal of a tower crane easily by locking a crane body an uppermost floor skeleton and supporting it tight with an outrigger at the position after the completion of skeletal construction work with the tower crane, and then lifting up the upper masts successively. CONSTITUTION:When uppermost floor skeletal construction work is completed, two outriggers 10 and 10 are overhung, and each hydraulic cylinder 11 is situated on the specified steel frame, and then these hydraulic cylinders 11 and 11 are pushed out. In addition a crane body 4 is supported by the steel frame via these hydraulic cylinders 11 and the outriggers 10. Subsequently, a mast upper part being inserted through an opening part of a swivel base 12 of this crane body 4 and slightly projecting upward from this upper end is hitched on a hook at the end of a boom 13, lifting it just above, and thus it is removed. At this time, a climbing boom 6 is stored in a lower part of the outrigger 10 in advance after contracting another hydraulic cylinder 7. In succession, the next mast upper part is hitched on by the hook, lifting up as it is for removal. This operation is repeated successively, whereby this mast upper part is lifted up to the mast and a footing base for removal.

Description

Detailed Description of the Invention

[0001]

[Field of Industrial Application] The present invention, after the construction of a building structure is completed,
The present invention relates to a device that can easily remove a mast of a tower crane.

[0002]

2. Description of the Related Art When building a building using a mast climbing type tower crane, first, a mast is established at a predetermined position in the building, and a crane body equipped with a climbing device is provided on the mast. As the skeleton construction progresses, the masts are successively added and the crane main body is raised by the climbing device to build the top floor of the skeleton. After the completion of the work on the top floor, the tower crane that is no longer needed when the crane work is completed is dismantled and removed using a large mobile crane for dismantling.

[0003]

However, since the tower crane is installed inside the building, the mast of this tower crane on the floor of the building must be removed until the crane work such as tower construction and outer wall construction is completed and the tower crane is removed. The opening that is being inserted cannot be closed. For this reason, it was not possible to start the internal finish early, and there was a limit to the shortening of the construction period.

According to the present invention, after the construction of the building up to the top floor is completed, the climbing crane main body is supported on the top floor building by the outriggers provided in the crane main body, and then the climbing device and the crane main body are used for the addition. The purpose is to lift the mast sequentially from the top and remove it using the crane body.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above object, and is a hoisting device for a revolving base having an opening through which the mast is supported so as to be able to move up and down. Also, a boom that can be lifted up and down is installed, an outmast is arranged under this swivel base, and a crane main body is configured with a climbing frame via a hydraulic cylinder for climbing on this outmast, and it is possible to project to this outmast It has a built-in outrigger and is equipped with a hydraulic cylinder that supports it on the top floor structure. After the crane body is supported on the top floor structure, the crane is lifted up from the upper part of the mast through the opening of the swivel base and then removed. With this, the mast is removed after supporting the crane body on the uppermost floor of the body via the outrigger, which makes it possible to start the floor closing work of the mast insertion part etc. early.
The crane body can be used as a rooftop stationary jib crane.

[0006]

[Operation] After the tower crane is installed inside the building, after the steel frame assembly work, that is, the skeleton construction work, the outrigger provided at the bottom of the outmast of the crane body is extended and the hydraulic jack built into this outrigger is pushed out. Next, the crane body is fixed on the bundle material that is installed in advance on the steel frame of the top floor structure. Then, the uppermost mast is lifted from the opening in the center of the crane body using the crane body. At this time, the uppermost mast is separated from the lowermost mast, and the uppermost mast is removed. Next, the second mast from the top is separated from the third mast, and the second mast is lifted from the opening in the center of the crane main body and removed. In this way, from the upper part of the mast to the lower stay and foundation base are sequentially lifted and removed from the opening in the center of the crane's swivel base, and the crane body supported by this top-floor skeleton is used as a rooftop stationary jib crane to finish the building. To use. Furthermore, this allows the mast to be removed using the tower crane body, and the internal finishing work such as closing the opening of each floor can be started early.

[0007]

The present invention will be described below with reference to the illustrated embodiments. Tower crane mast 1 in place inside the building
Like the mast of a conventional tower crane, this is constructed by sequentially adding a mast 1 of the required length to the upper part of the foundation base 2 so that it projects above the uppermost floor of the skeleton and the lower stay is at the bottom. 3 is provided. The mast 1 is equipped with a self-elevating crane body 4.

As shown in FIGS. 1 to 3, the self-elevating type crane main body 4 has a climbing frame 6 disposed below a outmast 5 which is fitted on the mast 1 via a climbing cylinder 7. In order to raise the crane main body along the mast by the peristaltic movement between the climbing frame 6 and the outmast, the hydraulic cylinders 7, 7 for climbing provided on the 5th side are provided. The mast 6 is provided with mast holding mechanisms 8 and 9 for holding and releasing the mast 1, respectively, and the mast 1 is attached to the mast 1 by a combination of the holding and releasing operations of the mast holding mechanisms 8 and 9 and the expanding and contracting operation of the climbing hydraulic cylinder 7. Then, the crane body 4 is raised.

The outmast 5 of the crane body 4 has the same cross-sectional shape as the mast 1 so as to be fitted onto the mast 1, and has a required length so that the crane body can be stably held by the mast 1. The out mast 5 is provided with outriggers 10, 10 in addition to the climbing hydraulic cylinder 7 and the mast holding mechanism 9 described above.

This outrigger 10 is provided with one crane main body 4 in a stable manner so as to be capable of supporting two or more cranes directly or directly on a steel frame of the uppermost floor frame or on a bundle material previously installed on this steel frame. The outrigger 10 is provided with a hydraulic cylinder 11 that expands and contracts in the vertical direction. The outriggers 10 are horizontally expandable and contractable on both lower sides of the outmast 5 of the crane body 4.

A swivel base 12 is provided on the upper portion of the out mast 5 which is designed to ascend itself by a climbing mechanism along the mast 1, and the swivel base 12 has a boom 13 of a required length which can be lifted and lowered. A hoisting winch 14 of a wire rope W having a hook at its tip and a hook at the tip, and other parts necessary for crane work are provided.

Next, the construction method of the present invention will be described with reference to FIG. The building B in which the mast 1 is installed has a required structure including columns P, beams H, and the like. This skeleton work is performed in the same way as work using conventional tower cranes. That is, a self-elevating crane body 4 is installed on a mast 1 installed at a predetermined position in a building, and pillars, beams, etc. are lifted by the crane body and assembled sequentially from the lower floor side, and the crane is constructed according to the assembly level. The mast is lifted up and the mast is added to the upper part to complete the construction work on the top floor. In this skeleton work, the climbing frame is raised sequentially along the mast by the climbing hydraulic cylinder, and the crane body is supported by being clamped by the mast by the out-mast clamp mechanism. Sometimes I don't use outriggers. (See Fig. 4 (1))

Then, as shown in FIG. 4 (2), when the construction of the skeleton on the top floor is completed, the outriggers 10 and 10 are extended,
The outrigger hydraulic cylinder 11 that overhangs is positioned on a predetermined steel frame or a bundle material 15 that is installed in advance on the steel frame, and as shown in FIGS. 4 (3) and (4), the hydraulic cylinder 11 built in the outrigger is positioned. , 11 are pushed out. Then, the crane main body 4 is supported by the steel frame or the bundled material via the hydraulic cylinders 11 and 11 outriggers 10, and thereby the swivel base opening of the crane main body 4 is inserted to protrude a little above the upper end of the mast. Figure 4 (5)
Hook the hook at the boom end of the crane body as shown in, and lift the mast upper part just above to remove it. At this time, the climbing frame is stored under the outrigger by compressing the hydraulic cylinder for clamming.

Then, the upper part of the next mast is hooked by a hook and lifted up and removed. Repeating this operation, the mast is replenished, and the mast is separated from the upper part in the opposite order and lifted up (FIGS. 4 (6) and (7)), and finally the foundation base is also lifted up with hooks and removed.

After removing all the masts in this way, the crane body is supported as it is on the frame of the uppermost floor via the outriggers, and is used as a rooftop stationary jib crane for finishing work of the building. The mast insertion opening on the floor will be closed and interior work will be performed.

[0016]

According to the present invention, after the construction of the structure using the tower crane is completed, after the tower main body is fixed and supported by the outrigger provided on the crane main body at the position where the tower crane was installed, Since the upper mast is sequentially lifted and removed by the crane body by inserting it through the opening of the swivel base of the crane body, the crane body can be used for removing the mast without moving it, and It can be used as a rooftop jib crane and has the advantage that the construction period can be shortened because the floor opening can be closed and interior work can be performed by removing only the mast.

[Brief description of drawings]

FIG. 1 is a front view of a mast removing device of a tower crane of the present invention.

FIG. 2 is a side view of the same.

FIG. 3 is a plan view of the same.

FIG. 4 is an explanatory diagram of an operation sequence of the device of the present invention.

[Explanation of symbols]

 1 Mast 2 Basic Base 3 Lower Station 4 Crane Main Body 5 Out Mast 6 Climbing Frame 7 Climbing Hydraulic Cylinder 8 Lower Mast Clamping Device 9 Upper Mast Clamping Device 10 Outrigger 11 Crane Main Body Support Hydraulic Cylinder 12 Swing Stand 13 Boom 14 Winding winch 15 Bunch

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[Procedure amendment]

[Submission date] May 13, 1994

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Figure 3]

[Figure 1]

[Fig. 2]

[Figure 4]

Claims (1)

[Claims] 1. A hoisting device and a boom which can be lifted up and down are provided on a swivel having an opening through which the mast can be penetrated, and an outmast is arranged below the swivel. The outmast is equipped with a climbing frame via a climbing hydraulic cylinder to form a crane body, and the outmast has a built-in outrigger that can be extended, and is equipped with a hydraulic cylinder that is supported on the top floor skeleton. A mast removing device for a tower crane, characterized in that the crane main body is supported on the top-floor skeleton, and then it is lifted from the upper part of the mast through the opening of the swivel and then removed.