The Optimization Of Winter Construction Of Building Engineering In Shen Yang City

In ShenYang zone the winter is very long. It is approximately 120 to 150 days from the beginning of November to the beginning of April in next year. In this period the construction of building engineering is shutdown. The main task of the dissertation researches suitable method of winter construction requirement in ShenYang zone.According to unsteady heat transfer theory, thermal retardation of concrete is analysed in daitail using numberial simulation method. The main inflence factors are the factor of heat conductivity and the specific heat of concrete, the heat of hydration of cement, contact material such as soil, insulating layer and outer temperature. The influence digree is studied. The early strenth of concrete is evaluted by the maturity.The applicability and thermal retardation effect of thermos method is studied using numberial simulation method. The different cast-in-situ concrete structure members are analysed in different atmospheric temperature. The foundation engineering is studied by mass concrete and driven cast-in-place pile. The main work is studied by the column and slab.The foundation engineering of Shengshihaoli Square is investigated on technique and ecnomy. Tent heating method and comprehensive thermos method were used in the same time. The thermal retardation effect is analysed by the surface and center temperature of concrete. It is reliable that numberial simulation method validated by the comparison with pratical data.Thermos method, comprehensive thermos method, curing method at subzero temperature and tent heating method are optional methods in ShenYang zone by the research of former project and the comparison of usual winter construction method, at the meantime the time-interval is divided for winter construction.