| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a formwork material for placing concrete capable of improving durability and extending a useful life. <P>SOLUTION: A formwork material 1 is provided to create a space S for placing concrete therein in a manner that a plurality of the formwork materials 1 are juxtaposed in the form of a fence. The formwork material 1 comprises: a tube body 2 made of rubber which expands or contracts by being charged or discharged with pressurized gas; an exterior body 3 which expands or contracts in response to an internal pressure of the tube body 2 by coating the tube body 2 and creates, when expanded, a curing surface 3S by contacting the concrete to be placed; and a valve 4 to charge or discharge the pressurized gas to and from the tube body 2. <P>COPYRIGHT: (C)2012,JPO&INPIT |
