INNER FORM FOR MOLDING OUTER SHELL PCa PILLAR

PROBLEM TO BE SOLVED: To prevent the deformation of an inner form and the deviation of a reinforcing strap from occurring during moving by fitting a square annular reinforcing strap onto the outer periphery of a long-size corner form member which is fixedly erected, in a freely attachable/detachable manner, between the corner parts of a fitment each for a square framelike pillar foot and a square framelike pillar head arranged opposite to each other at a specified interval, and press-holding an intermediate form structure blocking a space between the adjacent corner forms using bags introduced inward. SOLUTION: An intermediate form structure is arranged, in a dividing fashion, in eight spaces S1, S2 of the total nine spaces S1, S2, S0 segmented in the form of a lattice. In addition, an intermediate form member 43 is formed of a flexible material such as rubber into a long- size platelike shape and at the same time, has a projecting cotter formed on the surface and arranged in contact with the inner peripheral face of a reinforcing strap 22. Further, the width of each intermediate form member 43 is formed to the width corresponding to the inside measurement of each space S1, S2. Auxiliary form members 45 cover the periphery of a middle lattice reinforcement 21a, leaving no gap in between so that concrete is prevented from leaking out of the intermediate form members 43. Air bags 47 are made of a slender rubber of rectangular parallelepiped and introduced into the spaces S1, S2, S0 to press-hold the members 43. Thus it is possible to prevent the deformation of the inner form and the deviation of the reinforcing strap from occurring during during moving.