JP2002188322A - Constructing method for steel tower - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently construct a steel tower. SOLUTION: When the steel tower provided with an upper steel tower 1B having cross section smaller than that of an upper part of a lower steel tower 1A on the upper part is constructed, a work stage 3 provided with a climbing mechanism and a lifting device is installed so as to be vertically movable for the lower steel tower 1A after the lowermost part of the lower steel tower 1B is constructed. By repeating a process for extending the lower steel tower 1A upward by lifting a material by using the lifting device and a process for raising the work stage 3 by the climbing mechanism by taking reaction from the extended lower steel tower, the lower steel tower is executed up to the uppermost part. At the time, the upper steel tower is assembled in an elevatable state of the lower steel tower 1A at the inside of the lower steel tower, the upper steel tower is finally pulled up by a lift up device 16 and the lower part is connected and fixed with/to the upper part of the lower steel tower 1A.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a method for constructing a steel tower.

[0002]

2. Description of the Related Art In recent years, for example, a tower for a communication antenna is often provided on the roof of a building. Such a tower is constructed by lifting up materials sequentially by using a tower crane or a mobile crane and starting up the tower. The most common way is to go.

[0003]

However, installation of a tower crane may be difficult depending on the form and structure of a building, and a mobile crane requires a large-sized crane, which is assembled and installed. It is a prerequisite that a large site can be secured in the surrounding area. In any case,
The construction of a steel tower with a tower crane or a mobile crane is expensive, and since work at height must be performed at the center, the cost and labor for safety protection such as fall curing are enormous.

[0004] In view of the above, the present invention is an effective method of constructing a tower more rationally in place of the conventional general method using a tower crane or a mobile crane, and in particular, a smaller section on the upper part of the lower tower. It is an object of the present invention to provide an optimal method for constructing a tower that is applied when constructing a tower having a form in which an upper tower is provided.

[0005]

SUMMARY OF THE INVENTION The present invention is a method for constructing a tower in which an upper tower having a smaller cross section is provided above a lower tower. A work stage equipped with a climbing mechanism and a lifting device is installed on the lower tower so as to be able to ascend and descend through the climbing mechanism, and the material is lifted using the lifting device to extend the lower tower upward. Repeating the step and the step of raising the work stage by the climbing mechanism by taking a reaction force from the extended lower tower, constructing the lower tower to the uppermost part thereof, and when constructing the lower tower by repeating the above steps After assembling the upper tower inside the lower tower with respect to the lower tower, after the construction of the lower tower and the assembly of the upper tower inside the lower tower are completed, A lift-up device for lifting the upper tower is lifted by the lifting device and installed on the upper portion of the lower tower, and the upper tower is lifted by the lift-up device and the lower portion is connected and fixed to the upper portion of the lower tower, The lift-up device is removed by the lifting device, and then the work stage is lowered by the climbing mechanism to be dismantled and removed.

[0006]

Embodiments of the present invention will be described with reference to the drawings. In this embodiment, as shown in FIG. 8, the completed state of the tower 1 in the form of a two-stage structure in which the upper tower 1B having a slightly smaller cross section is provided on the upper part of the lower tower 1A, as shown in FIG. This is applied when constructing, and will be described below in the order of steps.

As shown in FIG. 1, first, a frame of a building 2 is constructed, and a lowermost portion of a lower steel tower 1A is constructed thereon.

As shown in FIG. 2, the constructed lower steel tower 1A
The work stage 3 is set up for. Work stage 3
Has a main frame 4, a climbing mechanism 5, and a lifting device 6, as shown in FIG. The climbing mechanism 5 holds the upper part of the lower steel tower 1A and is capable of moving up and down by itself by rearranging the holding position sequentially upward or downward. It is set up and down with respect to the steel tower 1A. The lifting device 6 is a trolley that can travel in a horizontal direction (both front and rear and right and left directions) by a rail 7, and lifts a material 8 such as a two-node steel frame as shown in the figure and mounts the material 8 on the trolley. It can be transported horizontally up to A work scaffold 9 is provided at the lower part of the main frame 4, a frame scaffold 10 is installed there, and a roof 11 is provided at the upper part of the main frame 4.
Is provided, and an outer periphery curing 12 is suspended from the periphery thereof.

As shown in FIG. 3, the lower steel tower 1A which has been constructed by lifting materials using the lifting device 6 of the work stage 3 is constructed.
The lower tower 1A is sequentially extended upward by sequentially assembling the upper part of the lower tower. When the lower tower 1A is extended by a predetermined height, the entire work stage 3 is lifted by the climbing mechanism 5 by taking a reaction force from the lower tower 1A, and such a process is repeated to construct the lower tower 1A to its uppermost part. I do. Then, simultaneously with the construction of the lower tower 1A, the upper tower 1B is assembled inside the lower tower 1A.
Since the upper tower 1B assembled here is pulled up to the upper part of the lower tower 1A in a later process, the upper tower 1B is assembled in a state capable of being pulled up with respect to the lower tower 1A.

As shown in FIG. 4, the lower tower 1A is constructed up to the uppermost part, and the upper tower 1B is also assembled up to the uppermost part, and various facilities such as the platform 13, the antenna 14, and the lightning rod 15 are provided on the top. After the stage is attached, the lift-up device 16 for lifting the upper tower 1B is lifted by the lifting device 6 and installed above the lower tower 1A. As shown in FIG. 10, the lift-up device 16 includes a plurality of jacks 19 that can pull up the entire upper tower 1B by pulling up a lower receiving table 17 attached to a lower portion of the upper tower 1B via a pulling rod 18. And a guide frame 20 for supporting the side portion of the upper steel tower 1B to guide its rise and to prevent it from overturning.

As shown in FIG. 5, after the roof 11 on the upper part of the work stage 3 is disassembled to secure a path for lifting the upper tower 1B, the upper tower 1B is sequentially lifted by the lift-up device 16.

As shown in FIG. 6, the lower end of the upper tower 1B is raised to the height of the upper end of the lower tower 1A, where they are connected and fixed. At this time, the guide frame 20
May be projected above the lower tower 1A, or other means may be used as needed to prevent the upper tower 1B from tipping over. Alternatively, the upper part of the lower tower 1A and the lower part of the upper tower 1B may be connected and fixed in a wrapped state. Thereafter, the lift-up device 16 is disassembled and removed by the lifting device 6, the work stage 3 is slightly lowered, and the platform 21 is constructed on the upper portion of the lower steel tower 1A using the upper portion of the main frame 4 as a scaffold.

When the work stage 3 is lowered as shown in FIG. 7 and dismantled and removed, the steel tower 1 is completed as shown in FIG.

According to the method of the present embodiment, the work stage 3 is raised by the climbing mechanism 5 and the steel tower 1 is constructed by the lifting device 6 mounted on the work stage 3. No mobile crane is required, so that the tower 1 can be constructed efficiently even under conditions where a tower crane or a mobile crane cannot be used or is difficult to use. In addition, since most of the work can be performed on the work stage 3, work at a high place is substantially eliminated, and since the work scaffold 9 and the outer peripheral curing 12 are provided, safety protection is thorough, and the roof 11 is provided. It is not affected by the weather. In addition, when the lower tower 1A is constructed, the upper tower 1B is assembled at the same time inside the lower tower 1A. Finally, the upper tower 1B is lifted up by the lift-up device 16 and connected and fixed to the upper part of the lower tower 1A. The assembling of the tower 1B can be performed efficiently and safely, and the work stage 3 can be raised to the top of the lower tower 1A.

As described above, according to the tower construction method of the present embodiment, the tower construction can be performed much more efficiently than the conventional general method, and therefore, the construction cost and the construction period can be reduced. This is extremely effective.

It should be noted that the present invention is not limited to the above-described embodiment, but the lower tower can be constructed by raising the work stage, and the upper tower can be assembled inside the lower tower. To some extent, the form, scale and structure of the steel tower to be constructed are arbitrary, and are naturally applicable not only to those constructed on the roof of a building but also those constructed on the ground. In addition, the work stage, the lifting device and climbing mechanism mounted on it, the lift-up device and other configurations are also the form and scale of the steel tower to be built,
Appropriate design changes may be made in accordance with the structure. Further, in the above embodiment, it is preferable to provide the outer peripheral curing and the roof provided on the work stage, but these are not indispensable and may be omitted when unnecessary.

[0017]

According to the present invention, a work stage provided with a climbing mechanism and a lifting device is installed on a lower steel tower, and while the work stage is lifted, materials are lifted by a lifting device mounted on the work stage to lower the lower steel tower. While extending upward,
At that time, the upper tower was assembled inside the lower tower, and the upper tower was lifted up by a lift-up device and connected to and fixed to the upper part of the lower tower, so the construction of a two-stage tower consisting of the lower tower and the upper tower was constructed. Can be carried out efficiently without using tower cranes or mobile cranes.Moreover, the use of a work stage can eliminate high-altitude work, and is also thorough in terms of safety protection. This is extremely effective because it can reduce the construction cost and construction period related to steel tower construction.

[Brief description of the drawings]

FIG. 1 shows a construction method according to an embodiment of the present invention, and shows a state in which the lowermost part of a lower steel tower is constructed.

FIG. 2 is a diagram showing a state in which a work stage is installed.

FIG. 3 is a diagram showing a state where an upper tower is being assembled inside a lower tower while the same is being constructed.

FIG. 4 is a diagram showing a state where a lift-up device is installed.

FIG. 5 is a diagram showing a state in which the upper steel tower is lifted up.

FIG. 6 is a view showing a state where the lower part of the upper tower is connected and fixed to the upper part of the lower tower.

FIG. 7 is a view showing a state where the work stage is lowered.

FIG. 8 is a diagram showing a state where the steel tower is completed.

FIG. 9 is a diagram showing an outline of a work stage.

FIG. 10 is a diagram showing an outline of the lift-up device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Steel tower 1A Lower steel tower 1B Upper steel tower 2 Building 3 Work stage 4 Main frame 5 Climbing mechanism 6 Lifting device 7 Rail 8 Material 9 Work scaffold 10 Frame scaffold 11 Roof 12 Peripheral curing 13 Platform 14 Antenna 15 Lightning rod 16 Lifting device 17 Lower part Cradle 18 Lift rod 19 Jack 20 Guide frame 21 Platform

Claims (1)

[Claims] 1. A method for constructing a tower in which an upper tower having a smaller cross section is provided above a lower tower, comprising a climbing mechanism and a lifting device after constructing a lowermost part of the lower tower. The work stage is installed so as to be able to ascend and descend through the climbing mechanism with respect to the lower tower, a step of lifting the lower tower with materials using the lifting device, and extending the lower tower. The step of raising the work stage by the climbing mechanism by taking a reaction force is repeated to construct the lower tower to the uppermost part thereof, and when the lower tower is constructed by repeating the above steps, the upper tower is placed inside the lower tower. After assembling the lower tower and assembling the upper tower inside the lower tower, lift the upper tower. The lifting device is lifted by the lifting device and installed on the upper part of the lower tower. The upper tower is lifted by the lifting device and the lower part is connected and fixed to the upper part of the lower tower. Removing the lift-up device, and then lowering the work stage by a climbing mechanism to dismantle and remove it.