摘要
常规地铁站点施工都是主体结构基坑先开挖,待主体结构完工封顶后才进行附属基坑的开挖,这会使施工周期大大变长,而且还会造成主体基坑的部分结构二次开挖及二次支护的成本增加。滇池湖相沉积的地层较为特殊,由工程性质较差及灵敏度较高的软土组成,为避免二次开挖对周围土体带来过度扰动和节约工期,探索采用主体与附属结构基坑同步施工的施工工艺。以昆明地铁巫家坝站项目为依托,在湖相沉积的软土场地采用主体和附属结构基坑同时开挖的施工工艺。对此施工方法、步骤、工艺措施、实施后连接处的变形缝出现错位及渗漏水等问题进行了研究,结合监测数据对出现问题的原因进行了分析,并采取了有针对性的处理措施确保工程安全,可为地铁站点主体与附属施工提供一种新的施工措施,也为类似工程分析及问题处理提供参考。
The construction of regular subway station points is the first excavation of the main structure foundation pit,After the main structure is completed and capped, then the subsidiary structure foundation pit excavation, which will greatly lengthen the construction cycle, but also cause the main foundation pit part of the structure of the secondary excavation and secondary support cost increased. The soil layer of the Dianchi lacustrine sedimentary stratum is relatively special, which is soft soil with poor engineering properties and high sensitivity. To avoid excessive disturbance of surrounding soil caused by secondary excavation and save the construction period, the construction technology of simultaneous construction of main body and auxiliary structure foundation pit is explored. Based on Kunming Metro Wujiaba station project, the construction technology of excavation of main structure and auxiliary structure simultaneously in a lacustrine soft soil area.This construction method, construction procedure, construction technology, and measures to implement joint deformation after the seam displacement and seepage problems are studied, and combined with the monitoring data of the cause of the problems are analyzed, and targeted treatment measures were taken to ensure the safety of engineering, can be as the main body in the subway stations and affiliated construction provides a new technology measures, It also provides a reference for similar engineering analysis.
作者
王鹏
阮永芬
朱强
WANG Peng;RUAN Yongfen;ZHU Qiang(China Railway 16TH Bureau Beijing Metroengineering Construction Co.,Ltd.,Beijing 101100,China;Faculty of Civil Engineering and Mechanics,Kunming University of Science and Technology,Kunming 650504,China)
出处
《结构工程师》
2022年第6期161-167,共7页
Structural Engineers
关键词
主体
附属结构
变形缝
渗漏
监测数据
Main body
Subsidiary structure
Deformation cracks
Leakage
Monitoring data
