To save labor for form work and installation of reinforcement at construction site and to save wood resources ， square shell concrete form (PCa − shell) was developed ， The PCa − shell is made of high strength concrete 〔 Fc 窩 500 kgf／cmz)and contains hoops and tie bars ． A column is made by putting the PCa − shell on main bars and then molding core concrete in it ， So main bars of the column do not touch directly with lateral reinforcements ． 正 nthis pape ら the shear − flexural structural experiments on cast − in − place reinforced concrete members using the PCa − shell (half − precast members) were described ．

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