ANALISIS METODE PELAKSANAAN COR BERTAHAP PRECAST PADA PENYELESAIAN PROYEK OVERPASS PT. TALENTA BUMI MARABAHAN STUDI KASUS PADA PROYEK OVERPASS – MARABAHAN

Abstract

The precast method work is adjusted because the slab elevation is ± 7 meters high, so it takes a lot of scaffolding (material) and time. Determination of precast concrete is done by analyzing preliminary design calculations, precast loading calculations, evaluating the load to be lifted, in the form of precast self-load, for precast concrete lifting time, precast concrete reinforcement, scaffolding calculations against precast self-load. Based on the results of the study for the age of 1 day concrete for the lifting permit of K-35 tons crane more than the precast load, then the load can be carried by the crane. But in the cylinder validation test, the value is obtained on the first day, so the work can be done earlier. As for the top cast with insitu cast method using the coefficient on day 3 with a value of 0.4, the comparative value of Mu = 30.893 tons.m and Mr = 31.877 tons.m according to the cylinder validation test graph with fc' 12 MPa, the work was obtained on day 2 and because the concreting was carried out in the fastest time of 1 day, the casting could be done on day 3 where the quality of concrete compressive strength has met according to PBI'71 regulations.