To provide an economical concrete placing method, by which a cement is favorably hardened and an early demolding work become possible even in summer or ion winter.
Form panels 2 and 4 are box-shaped members having respectively internal spaces. Over the whole regions of form surfaces 2a and 4a, a plurality of fine pores communicating with the internal spaces are formed. On the rear surfaces 2b, feed holes 24 communicating with the internal spaces are provided. Just before the placement of a concrete C, the supplying of a concrete accelerator from a fluid supplying system into the internal spaces is started. In this case, through the flowing-in of the concrete accelerator from the internal spaces through the fine pores inside form surfaces, the hardening of the concrete C on a surface side is hastened as compared with that on an interior side. Thus, since the surface side of the concrete hardens eariler that its interior, an effective means is realized when the early demolding work of the form panels 2 and 4 or the reduction of the side pressure of concrete applying to the form panels 2 and 4 by the placing of high fluid concrete is intended.
KYO GAIRIN
SAKAMOTO ATSUSHI
SHINDO TAKEFUMI
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