STUDY ON OPERATION STANDARD TIME WITH PRECAST MEMBERS IN CONSTRUCTION OF HIGH-RISE RC BUILDINGS USING HIGH STRENGTH CONCRETE

A 45-story RC building, where pre-cast concrete members were employed for its outer frame as well as inside columns and beams, were construction, and the estimate equation of the operation standard time was examined with its construction data. As a result, the following conclusions were obtained. 1) In this measurement, the installation time of the pre-cast member in the top floor has decreased to 39.4〜63.8% compared with that in the floor. 2) In the construction of the high-rise RC building, the reason for the reduction in installation of the pre-cast column and the pre-cast beam from a lower floor to the upper depends on both the improvement of worker's capability and the change in the work difficulty. 3) The change in the total mean operation time by repeating work in high-rise RC buildings can be estimated with the logarithm model of the learning engineering. However, it is necessary to consider the change in the work difficulty for evaluation of the installation time of pre-cast members in high-rise RC buildings.