新型逆作法结构型式的设计与应用  

Application and design of new top-down excavation method

作　　者：王卫东[1] 翁其平[1] 胡玉银 

机构地区：[1]华东建筑设计研究院有限公司,上海200002 [2]上海建工(集团)总公司技术中心,上海200050

出　　处：《岩土工程学报》2006年第B11期1546-1551,共6页Chinese Journal of Geotechnical Engineering

基　　金：上海科学技术委员会资助课题(04dz12001)

摘　　要：本文基于上海由由国际广场基坑工程的成功实践,在常规逆作法基础之上提出了新型逆作法的结构型式,即结构梁板替代水平支撑、结构竖向构件框架柱与临时立柱相结合,但围护结构采用临时围护体的结构型式。创新性地在由由国际广场工程中提出并应用了围护桩与内部结构之间设置型钢混凝土变刚度转换结构、采用变标高首层结构梁板作为水平支撑、在复杂边界条件下设置多个大直径圆环、以及裙楼逆作主楼顺作的成套新型逆作法技术。实施结果表明:新型逆作法在本基坑工程设计中取得了良好的社会和经济效益,为今后类似基坑工程的设计提供了借鉴,并希望该新型逆作法结构型式在工程实践中得到进一步的提高和完善。Throngh the successful application of Shanghai Youyou International Square project, a new top-down excavation method was introduced based on the general top-down excavation method. The key design techniques of the new top-down method include： （1） using the temporary fender cast-in-place piles as exterior-protected construction in top-down excavation process; （2） substituting level bracing system by basement slabs; （3）combining the vertical structural supporting column with the temporary vertical shoring etc. A series of new techniques, including the profiled bar-concrete controlled bracing system, substituting level bracing system by variable level basement roof slap, several large diameter rings bracing on complex boundary condition, the top-down method of podium and the down-up method of turret etc. were first introduced and practiced in excavation engineering. It is shown that the new top-down method have good economic and social benefits. The method provides a new excavation engineering design choice for the similar pits, and the technology will be modified and improved in the future excavation design applications.

关 键 词：超大面积深基坑 新型逆作法 型钢混凝土变刚度转换结构 大直径圆环 一柱一桩 支护结构与主体结构相结合 结构梁板替代支撑 

分 类 号：TU470[建筑科学—结构工程]