PURPOSE: To save working labor, and to shorten the construction period dispens ing with the need of assembling, disassembling, and reassembling work of a form at each time of concrete placement as well as the need of assembling, disassembling, and with drawing work of timbering.
CONSTITUTION: A form device is provided with a cylindrical form 5 on the outside of which concrete C is placed, a formwork lifting device 6 that is installed so as to be brought into contact with the top of the concrete C, an edging sheet 7 that is interposed between the outer circumference of the form 5 and the concrete C so as to cause relative slide therebetween, and fixing jigs 8 for temporarily fixing the lower end of the form to the hollow inside of the concrete C. The lifting device 6 is provided with an equilateral triangular beam 17 (not shown) crosswise arranged on the top of the form, a plurality of supporting legs 19 that are positioned below the respective apexes of the beam 17 and are erected on the top of the existing concrete, and lifting jacks 21 that are arranged on the beam 17 in the intersection with the form 5 and are connected with the form 5 through hanging wires W.
OKUDA YUKIO
NOZAKI TOKIHISA
MIZUMOTO MINORU