JPH0344180B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a method for raising the height of a power transmission tower.

Existing tower-like structures such as power transmission towers need to be raised in height due to industrial development, increased power capacity, and urbanization.

However, in order to raise the height of the tower, it is not only difficult to secure land to construct a new steel tower, but also the construction cost is enormous.

Therefore, it is necessary to raise the height of the steel tower on the existing site. However, in the past, in order to raise the height of an existing steel tower, for example, the joint with the tower's foundation was removed and jacked up, but the height of each raising was small, and as a result, the construction period was long. Furthermore, there are many problems in increasing the size and cost due to insufficient strength of the steel tower members due to raising the height, as well as ensuring safety during construction.

In view of these points, the present invention is a construction method that deals with this problem.

In other words, the existing steel tower is used as is, the vertical space inside the tower is used, the main column is raised to a higher height and stands upright, and the main column and the tower members are reinforced with reinforcing pieces, etc. This is a construction method that connects and integrates and raises the height, and is provided for the purpose of shortening the height raising period, increasing safety by raising the height, and reducing construction costs. , unit main pillars of appropriate length are successively connected at the bottom, and then raised using appropriate lifting means such as jacks or lifting machines with the steel tower as a guide, assembled to a raised height, and then erected. The feature is that the support column and the existing steel tower are connected with reinforcing pieces, etc., and are integrated to raise the height.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the power transmission tower raising method of the present invention will be described in detail below with reference to the accompanying drawings.

1 is the existing steel tower, 2 is the main pillar, and this main pillar 2 is
At the center of the vertical space 3 in the steel tower 1, unit main columns a are vertically assembled sequentially from below until they reach a raised height and are erected on the foundation.

In addition, to assemble the main column 2, for example, unit main column a is guided and lifted within the steel tower using an appropriate lifting means such as jacking or pulling, and the next unit main column a is placed below this unit main column a. Connect them and repeat this process to assemble them one by one.

Numeral 4 is a reinforcing piece that connects and integrates the steel tower and the main column 2 to give strength to the main column 2.

Reference numeral 5 is a cross arm, which is attached to the upper side of the main pillar 2.

As described above, the present invention utilizes the vertical space 3 in the existing steel tower 1, and uses the steel tower 1 as a guide to lift the unit main column a in a certain range by lifting means such as jacks or ropes. , (See Figure 2) Add another connected unit main pillar a to the lower side of this lifted unit main pillar a, and make the uppermost unit main pillar a.
A main pillar consisting of unit main pillars a and a is vertically erected in the space with the height of the raised height, and the steel tower 1 and the main pillar 2 are further connected by a reinforcing piece 4 to be integrated and raised ( (See FIG. 3) After this raising work is completed, a cross arm 5 is attached to the upper side of the main column 1 according to demand. (See Fig. 4) As described above, the height raising of the present invention involves assembling and erecting a new main column 2 in the vertical space 3 in the existing steel tower 1 to the raised height, and then using the steel tower 1 and reinforcing pieces 4. Since the project is to be raised in an integrated manner and is carried out on the site of the existing steel tower 1, there is no difficulty in securing land and the period can be shortened, unlike when constructing a new tower.

In addition, since the main pillar 2 is installed inside the tower while leaving it as is, there is very little need to increase the size of the existing tower due to lack of strength when raising the tower, and furthermore, power transmission outages can be shortened.

It also has the effect of reducing costs.

It goes without saying that the unit main column structure can be designed as a single column made of steel pipes or H-beams, a composite column, or an assembled column such as a lattice column, as required.

[Brief explanation of drawings]

The drawings are explanatory diagrams of the power transmission tower raising method according to the present invention. Figure 1 is a front view of an existing tower, Figure 2 is a front view of the main pillar connected when raising the tower, and Figure 3 is a diagram showing how the main pillar is raised. Figure 4 is a front view of the main pillar assembled at the same height, Figure 4 is a front view of the cross arm attached to the upper side of the main pillar, Figure 5 is an enlarged view of a part of the main pillar integrated by connecting them with reinforcing pieces, Figure 6 The figure is a plan view of FIG. 5. 1... Existing steel tower, 2... Main pillar, 3... Space section,
4... Reinforcement piece, 5... Bracelet, a... Unit main pillar.

Claims (1)

[Claims] 1. In a tower-like structure such as an existing power transmission tower assembled on a foundation, a large number of unit main columns are successively installed vertically in the center of the vertical space within the tower using an appropriate lifting means. The new main pillars, which were connected to each other and assembled at a raised height, were then erected on the foundation, and
A method of raising the height of a power transmission tower, in which the new main pillar and the existing tower are connected as one piece with appropriate reinforcing pieces, and arms are attached to the top of the new main pillar at appropriate intervals.