It has been proved through practices that to 2-column type tubular steel towers in places inaccessible by cranes, assembling by parts through square type800 lifing pole is an effective and economic way.

Besides concrete and steel composition section,the steel tower column is divided into 21 sections.

With the increase of steel output at home and the advance of bridge design and manufacture, steel tower column is so properly applied to Nanjing No.

3 Yangtze river bridge consist of five across continuous cable-stayed bridge of steel tower and steel beam,the tower above the beam adopts steel tower pillar,this paper describes the basic circumstance of installation, the equipments of installation and the key technology of the installation.

It is the first time that the steel tower is applied in Nanjing 3~(rd) Yangzi River Bridge in China.

Application and structural design of steel tube towers for large span crossing transmission lines;

The whole hoisting methods of 220kV four circuit steel tube tower;

Research on the seismic responses of large diameter steel tube towers;

The 500kV Zhao-hua-bo transmission line adopts large assembly method of steel-pipe-tower,introduces the structure,construction basis design and installation process of steel-pipe-tower,and expounds the decomposition assembly method of internal suspension.

Through actual project example,load force of the steel-pipe-tower basis is analysed,the concrete dimension of the basis is obtained.