| 摘要 |
<p>PURPOSE:To stably make a large diameter circular hole in a structure by a lightweight device. CONSTITUTION:A through hole 3 is provided to the circular cutting line of a structure 1 to be cut or the center thereof. A shaft 5 is passed through the through-hole 3 and supporting arms 13, 20, are fixed to both end parts of the shaft 5. An endless wire saw 23 are provided to the pulleys 15, 22 provided on both supporting arms 13, 20 through the through-hole 4 on the cutting line under tension. By driving the wire saw 23 by a driving device and rotating the supporting arms 13, 20 around the shaft 5, the structure is cut in a circular shape.</p> |
