To provide a work platform lifted and lowered along the external wall surface of a chimney by an elevator for safely conducting chimney demolition work efficiently.
In a working floor 11 in which a floor face is constituted by adjusting the overlap quantity of a plurality of step floor members 12 and 13 in response to the diametral change of the chimney 1, a plurality of the working floors 11 are supported at upper ends and arranged at specified intervals along the external wall surface of the chimney in conformity with the external shape of the assembled chimney 1, and unit frames 20 capable of supporting rod expansion/contraction operations of extension jacks 25 by re-piling upper-stage bearing plates 23 and lower-stage bearing plates 24 pushed and fixed to the surface of the external wall surface concrete of the chimney with high friction are used as main structures. Grip jacks 41 and ring chains 45 adjusting a length in the peripheral direction in response to the change of the diameter of the chimney and being capable of adjusting a trace quantity in the peripheral direction for controlling a pushing force against the external wall surface of the chimney of the bearing plates 23 and the bearing plates 24 are mounted among the unit frames 20 and the adjacent unit frames 20.
COPYRIGHT: (C)2004,JPO
Akira Yasokawa
Umeo Oishi
Terumi Akizumi
Eiji Fujisawa
Hisahide Kobayashi
Takashi Watanabe
Hirohisa Yamashita
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