| 摘要 |
For the working down of light poles, e.g. for light bridges, use is made of tubular poles (2), which are mounted by the flush-down method, whereby, however, use is not made of auxiliary flushing spears, but of the single tubular poles (2) as a self-contained permanent flushing spear. Correspondingly the poles are easy to take up, by introduction of compressed air therein. The mounting work is facilitated to the degree that light bridges can now be erected by a single operator, making use of an additionally disclosed method. |
