对既有人防商场下进行结构托换的可行性分析

Feasibility Study of the Underpinning Method under Civil Air Defense Marketplace

研究目的：通过对既有人防商场下修建地铁车站设计的介绍，总结出城市轨道交通在既有建筑物下修建地铁时设计的几条经验。研究方法：针对哈尔滨主干道东大直街下既有人防商场修建地铁车站的实际情况，在分析主动托换技术的基础上，采用有限元模拟和结构计算分析的研究方法对既有人防商场下修建地铁车站进行研究分析。研究结果：通过对对地下商业街立柱进行两次托换，第一次托换消除可能产生的1．7～2．4mm的差异沉降。第二次转换时，消除地下商业街侧墙与立柱可能产生的最大沉降差8．4mm后。整个施工过程中，通过对既有商场结构的托换可以保证地下商场的安全，路面交通的顺畅，保证了周边商业的正常营业。研究结论：地下商场结构托换的设计施工方法是可行的，对于在既有地下建筑物下修建结构，采用主动托换技术，设计中还有许多问题值得研究探讨，这是今后工作的研究方向。

Research purposes： This paper gives some experiences in railway designing in the condition of having buildings by introducing the designing of railway with having civil air defense marketplace. Research methods：According to the real construction situation of railway station under civil air defense under the East Straight Street in Haerbin, the analysis and research have been made by adopting the methods of finite analysis and structure analysis on the railway station under civil air defense based on the analysis of initiative underpinning method. Research results： After two underpinning to marketplace structure, the possible different settlement of 1.7 - 2.4 mm are banished and then the maximal settlement between side walls and pillars of 8.4 mm is eliminated. In the whole construction, the method assures the traffic in sequence and the business in normal. And it is an effect method to put in practice. Research conclusions： It is feasible to adopt the underpinning method to marketplace underground in construction. There are many questions to research in design of buildings which are in the condition of having buildings underground and adopt the initiative underpinning technology, and it is the research direction in the following work.