| 摘要 |
Constructing cylindrical structures such as tall steel chimneys, advertisement towers and antenna supports by separately preparing a cylinder with a closed upper end, which will become the top end section of the intended cylindrical structure, and a plurality of extension cylinders to be successively connected thereto, fitting said closed-end cylinder to a fixed guide in telescopic relation, supplying compressed gas into an inside air-tight space surrounded by said cylinder and guide to lift the closed-end cylinder, connecting one of the extension cylinders to the lower end of the lifted cylinder and lifting the extended cylindrical structure by again utilizing compressed gas. These procedures are repeated whereby a cylindrical structure of desired height can be safely constructed.
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