悬挑式钢支架在崖壁倾斜建筑施工中的应用与分析

Application and analysis of cantilevered steel bracket in construction of cliff inclined building

为解决崖壁倾斜建筑施工中的种种困难,针对建筑核心倾斜筒柱的施工,设计了重力式悬挑式钢支架。在开展钢支架初步设计的基础上,通过有限元仿真,结合悬挑式钢支架吊装、核心筒柱浇筑及养护、模板拆除等施工过程,对钢支架结构的应力及变形进行分析,探究该支架的合理性。并在实际施工过程中开展了支架关键点位的应变监测,以探究该支架的实际实用服役状态。结果表明:最大应力和最大位移均发生在中间弦杆附近,分别94.45MPa和7.12mm,满足规范要求;应力设计较为富余,符合精细化施工要求;上部结构的位移明显大于下部结构的位移,几乎相差50%。最后,结合分析结果,提出了相应的钢支架施工技术要点,以保证建筑结构安全性。研究结果为类似的崖壁倾斜建筑工程施工提供了结构理论及实际经验。

In order to solve the difficulties in the construction of cliff inclined buildings, gravity cantilevered steel bracket is designed in this paper for the construction of core inclined tube column of buildings. On the basis of carrying out the preliminary design of the steel bracket, the stress and deformation of the steel bracket structure are analyzed through finite element simulation, combined with the construction processes of the cantilevered steel bracket lifting, core cylinder column pouring and maintenance, formwork removal and so on, to explore the rationality of the bracket. And the strain monitoring of the key points of the bracket is carried out during the actual construction process to explore the actual practical service state of the bracket. The results show that: the maximum stress and the maximum displacement both occur near the middle chord, 94.45MPa and 7.12mm respectively, which meet the specification requirements;the stress design is more surplus, which meets the requirements of fine construction;the displacement of the superstructure is significantly larger than that of the substructure, with almost 50% difference. Finally, combined with the analysis results,the corresponding technical points of steel bracket construction are proposed to ensure the structural safety. The research results provide structural theory and experience for the construction of similar cliff tilt building projects.