For rationalization of construction work, a new construction method for R/C column using a precast concrete shell was developed. By a new method of assembling tie-hoops and constructing inner forms, and using high fluidity concrete, four workers can construct two high quality cast-in-place precast concrete shells in a day. In the case of a high-rise building, when a unit construction method is adopted (unit consists of a precast concrete shell combined with column main reinforcement and beam reinforcement) installation expenses decrease with work efficiency increase, a 14〜25% reduction is possible over the conventional method in respect to the length of time for skeleton construction work, the number of mechanical joints for reinforcement is decreased by about 25%. This can reduce the cost for skeleton construction of 32-story building by about 3%.
