JPS5928713B2 - How to build a steel tower - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a construction method for constructing a steel chimney or the like on the ground.

In the past, when assembling steel towers such as steel chimneys, it was generally done using truck cranes, winches, etc.
The construction method used is to stack the tower's components one by one from the bottom up at the construction site, but as the work progresses, the towers are placed at higher elevations (which not only increases the number of land inspections, but also increases the risk of lice). Because the parts swing, it becomes difficult to assemble the parts using bolts or welding, and work efficiency is significantly reduced.

In addition, if the construction site of the steel tower is small and it is not possible to install a crane, etc. in the immediate vicinity, a large crane with a long boom may be installed at a distance from the construction site to suspend the tower components. There are disadvantages such as the need to raise the crane, which increases operating costs for the crane, and the large cost of transporting the crane.

The present invention has been made in view of the above, and is a steel tower that does not require a large crane and can be efficiently and safely assembled on the ground or at a low position close to the ground, regardless of the size of the construction site. The purpose is to provide a construction method.

The present invention will be explained in detail below with reference to the drawings.

The attached drawing shows an example of the construction of a steel chimney with a frame, and 1 is a pedestal. This pedestal 1 is equipped with a jacking device 2, and a chimney 4 surrounded by a frame 3, that is, a steel tower is planned to be constructed. It is assembled by a small crane (not shown) on the ground (foundation concrete) 5.

Apart from the above, the steel tower has multiple divided structures aybC...
It is divided into upper and lower parts and assembled sequentially from the upper part as follows.

That is, the uppermost divided structure a is obtained by placing the inspection table 7 on top of the frame block 6, inserting the cylinder body 8 into the center of the frame block 6, and integrating both members with the fastening fittings 9. Place the powder blowout preventer 10 on top and assemble.

This divided structure a is carried onto a pedestal 1 by a crane or the like and supported in the air by a jacking device 2 as shown in FIG.

The second divided structure consists of two cylinder bodies 8 and a frame block 1.
3, the two cylinder bodies 8 are carried separately to the frame 1 by a cart 12 equipped with an up-and-down device 11, and they are raised by the up-and-down device 11 and welded etc. to the lower end of the cylinder body 8 of the split structure a. Furthermore, the frame block 13 is carried to the pedestal 1 in the same manner as described above, and is assembled by connecting it to the lower end of the frame block 6 of the divided structure a using high-tensile bolts or the like (see FIG. 4).

The third divided structure C is made up of two cylinder bodies 8 and a frame block 13 in the same way as the second divided structure, and is transported to the frame 1 in the same way as the second divided structure. The upper divided structure A is connected and assembled below the upper divided structure A, but prior to the above-mentioned assembly of the third divided structure C, the upper divided structure A is assembled.

b are raised by the jacking device 2 by the amount necessary for assembling and connecting the divided structures C while still connected together.

The jacking device 2 includes two gripping mechanisms 14 and 15 that grip the divided structures ab, c, etc., and after gripping the divided structure with one gripping mechanism 14 and raising it, the jacking device 2 The gripping mechanism 15 grips the divided structure, the gripping mechanism 14 releases the grip of the divided structure, the gripping mechanism 14 is lowered, the divided structure is gripped again, and the divided structure is raised in a so-called inch-taking or bug-like manner. It is now possible to do so.

The fourth divided structure d includes one cylinder 8 and a frame block 16.
, the fifth divided structure e is each composed of two cylinder bodies B and a large frame block 17 that cannot be gripped by the gripping mechanisms 14 and 15 of the jacking device 2.

In the case of the divided structure d, the already explained divided structure bye
Similarly, in the case of a large divided structure e that cannot be gripped by the jacking device 2, the seventh
As shown in the figure, a part of the splitting tube body 8 is integrally connected to the upper divided structure d by the same operation as described above, and grasped by the jacking device 2 to remove the entire part that has been integrally connected up to that point. The remaining portion of the large divided structure e is then assembled into a frame block 17.

When the large divided structure e is located directly above the pedestal 1, as shown in FIG. Then construct the frame block 17 of the large divided structure e directly above it, lower it supported by the jacking device 2 to the final construction position, and move the frame block 17 to the upper divided structure d and the lower frame 1. Connect to.

Note that the frame 1 is ultimately used as a frame block for the lowermost divided structure f.

After the frame block 16 and the frame block 17 have been connected, and the frame block 17 and the frame 1 have been connected, the cylinder body 18 and the muffler 19 are carried to the frame 1 and sequentially connected to the cylinder body 8 of the fifth divided structure e. Then, the silencer 19 is connected to the foundation concrete 5 using anchor bolts.

In the above, the coupling fittings 20.2N (Fig. 8) fixed to various parts of the barrel and the frame block are coupled together with the coupling bolts 22 to integrate the barrel and the frame block, and the horizontal direction of the frame block with respect to the barrel is Prevents runout.

Note that the lateral vibration of the cylinder body before the frame block is attached is controlled by a steadying stop (not shown) installed in the jacking device 2.

The frame 1, the cylinder body 18, and the muffler 19 constitute a lowermost divided structure f.

After the above work is completed, attached parts such as a ladder are attached in the usual manner, and the aforementioned connecting bolts 22 and jacking device 2 are removed to complete the construction work.

However, in the above embodiment, the divided structure bCyd,
e is assembled inside the pedestal 1 by connecting it to the upper divided structure, but they can also be assembled outside the pedestal 1 and transported to the pedestal 1.

Moreover, although each divided structure is described above as being composed of a plurality of members, that is, a cylinder body and a frame block, each cylinder body or frame block can be made into a divided structure.

As explained above, in this method of constructing a steel tower, the divided structure consisting of a plurality of upper and lower parts of the steel tube to be constructed is sequentially transported to the pedestal, and the upper part is lifted up by the jacking device of the pedestal. Since the steel tower is constructed by connecting it to the bottom of the structure, the components are suspended by a crane and stacked from below. It can be done in low places.

Therefore, there is less danger and higher safety, and the tower can be constructed efficiently and economically without using a large crane (as small as possible).

Moreover, since the construction work is done in a low place and there is little negative impact from lice, construction can be carried out exactly as planned.

Additionally, since a small crane can be used, the tower can be erected in narrow spaces that could not be built using conventional construction methods.

Furthermore, if the divided structure is transported to the pedestal using an ordinary cart without an up-and-down device, it is difficult to integrally connect the upper divided structure and the assembled lower divided structure. When the jacking device is operated, it is necessary to lower the divided structures supported by the jacking device a little, but in the present invention, each divided structure a to e is moved onto the frame 1 by a cart 12 equipped with a lifting device 11. The structure is such that the divided structure is transported, raised by the vertical device 11, and integrally connected to the lower ends of the upper divided structures a to e supported by the jacking device 2. (
The tower can be constructed quickly, accurately, and safely without any danger, without having to lower the tower (which is very heavy and large at the end of the work).

When assembling the large frame block 170 directly above the frame 1, the jacking device 2 is used to raise the entire frame to a slightly higher position than the final construction position.
The structure block 17 is assembled and the whole structure is lowered to the final construction position to connect the frame block 17 and the lower frame blocks 16 and 1, so that the connection work can be carried out smoothly.

[Brief explanation of the drawing]

The drawings show an embodiment of the method for constructing a steel tower according to the present invention, and FIG. 1 is a front view of the pedestal, FIG. 2 is a front view of the first divided structure at the top, and FIG. 3 is a front view of the second divided structure. The front view of the steel tower where the structure is being assembled, Figure 4 is the front view after the same assembly, Figure 5
The figure is a front view of the steel tower assembling the third divided structure, Figure 6 is the front view of the steel tower assembling the fourth divided structure,
FIG. 7 is a front view of the steel tower that is almost completed, and FIG. 8 is a cross-sectional view showing the state in which the cylinder body and the frame block are connected by connecting bolts. 1... Frame, 2... Jacking device, a, b, c, d
et f...divided structure.

Claims (1)

[Claims] 1 Set up the frame block of the lowermost divided structure f as mount 1 at the location where the steel tower is planned to be constructed, and then set up the mount 1.
A jacking device 2 is installed at the top of the tower, and a divided structure a-d, which is formed by dividing a steel tower into a plurality of upper and lower parts, is mounted on a cart 12 equipped with a vertical device 11 in a divided state or in an assembled state.
It is carried from the upper one to the frame 1 and placed under the raised upper divided structure a-c supported by the jacking device 2, and the divided structure a ''-' c
is raised by the vertical device 11 and integrally connected to the lower end of the upper divided structures a to c supported by the jacking device 2, and the entire divided structures a to C that have been connected together are The construction work progresses by repeating the work process of lifting by the jacking device 2 a necessary number of times, and as the construction progresses, a large divided structure e that cannot be gripped by the jacking device 2 is formed.
When this happens, the part 8 of the large divided structure e is integrally connected to the upper divided structures a to d by the same operation as above, and gripped by the jacking device 2, so that the part 8 of the large divided structure e is connected integrally with the upper divided structures a to d. The whole thing is lifted up by the jacking device 2, and the remaining parts of the large divided structure e are assembled to proceed with construction. When constructing the large divided structure directly above the pedestal 1, it is supported by the jacking device 2. The frame block 17 of the large divided structure is constructed directly above the final construction position by raising the entire structure slightly higher than the final construction position, and the structure supported by the jacking device 2 is lowered to the final construction position and the large structure immediately above it is lifted up slightly higher than the final construction position. A method for constructing a steel tower, characterized in that the construction of the steel tower is completed by connecting the frame blocks 17 of the divided structure to the upper and lower divided structures.