The Multi-storey Formwork Supports System And Its Safety Research For High Rise Building

With the development of the construction technology, multi-storey formwork supports system has been applied more widely in the high rise construction, and the construction period has accelerated to one story per 7 to 5 days or more quick. But collapses of supports system and cracks of floor happen frequently during the period of construction because of unsuitable configuration of supports system, incorrect removal of formwork supports and curing of early-age concrete. All the facts above affect the safety of construction and the performance of building. Therefore the research of multi-story formwork supports system is significant to the safety of construction and the reduction of construction period.Research in this paper shows that the multi-storey formwork supports system is a temporal and spatial system on the basis of field detection of different structure tapes and construction period. At the same time, study is done on the variation of axial force of the supports, the distribution of internal force of the floor and the support-structure interaction relation ship. By this study, the effects of the removal time and erecting method of supports on the bearing capacity of structure are revealed, the main corresponding technique points with different structural forms are presented; besides, the simplified model of multi-story formwork supports system is modified from the two aspects of the choice of low age concrete elastic modulus and asymmetry of different floors; finally a high rise concrete structure safety control measure is put forward for construction period.