| 摘要 |
<p>PURPOSE:To perform work safely and to improve efficiency without causing a danger accompanied by work at an elevated spot and by the use of explosives. CONSTITUTION:A suspension staging 4 is assembled so as to surround the base of a steel tower 1 and a guy drawing device 6 is provided at the base of each guy. At first, an antenna 3 is removed and a grip 7 is fixed to the tower 1 in the staging 4 and at the same time a lifting device 8 is provided between the grip 7 and the staging 4. The tower 1 is lifted slightly and under such conditions the lower part of the tower 1 is cut off and removed and thereafter the tower 1 is lowered and the guy 2 is drawn by means of the device 6 to support the tower 1 by a temporary supporting bases 4e, 11 and under such conditions the grip 7 is replaced, which operation is repeated.</p> |
