To hoist both forms and struts by hoisting mechanisms which are half in number compared with the number of mechanisms employed in a conventional method; to cut material costs and labor costs required for replacement etc. to half or less; and to narrow a clearance between concrete and each strut, thereby ensuring secure and safe working conditions and at the same time increasing the allowable load of each hoisting mechanism.

The struts 1 having a multi-stage scaffolding Y fixed thereto are arranged in parallel with the building with a space for moving the forms X being secured therebetween. Then the hoisting mechanism 2 is set on an upper end of each strut and a towing member 3 such as a wire or a chain extending from the hoisting mechanism is wound on a pulley 4a arranged near a lower end of the strut. Further the towing member is wound on a pulley 4b again, which is attached to a fixing member 5 mounted on a concrete wall surface C which delivers the strength thereof, and an end of the towing member is fixed to the strut. Thus the single hoisting mechanism achieves vertical movement of both the form and strut at every hoisting of the strut.