公铁合建超深车站施工方法比选

针对武汉地铁7号线徐家棚站基坑工程,对明挖顺作和盖挖逆作施工方法进行比选研究.通过数值计算、设计分析和工程实践经验总结,得到如下结论:一是开创"先逆后顺再拓"新型逆作工法,相对于同等厚度(1 500 mm)围护地连墙明挖法施工,节省投资占土建总投资的7.3％;相对于1 200 mm厚地连墙明挖法施工,节省投资占土建总投...

Comparison and Selection of Construction Methods of the Combined Highway and Subway for Ultra Deep Station

To reasonably determine the construction method of the Xujiapeng Station of the Wuhan Metro Line 7, through numerical calculation, design analysis, and engineering practice experience summary, open-cut and cover cut top-down construction methods of this project are compared and selected. The conclusions are as follows:(1) a new reverse construction method of "first reverse, then smooth, and finally extension" is created. Compared with the open-cut construction method of the enclosure diaphragm wall with the same thickness(1,500 mm), the investment saving accounts for 7.3% of the total civil engineering investment;compared with the open-cut method of a 1,200 mm thick diaphragm wall, the saved investment accounts for 5.3% of the total civil engineering investment.(2) The new top-down method is safe and reliable, with less investment, a better construction period, and environmental protection;this is a construction method of sustainable development and green construction.(3) The "two-point mechanical positioning method" of concrete-filled steel tubular columns is created, which is convenient and precise. The maximum accuracy can reach over 1/500 h, which can meet the requirements of design and engineering.