摘要
针对冬奥会延庆赛区外围配套综合管廊工程竖井明挖基坑上软下硬的地层特点,在上部卵漂石及强风化岩层内采用多支点排桩支护技术,对围护桩顶设置钢筋混凝土冠梁及支撑,桩底入弱风化岩层,并采用混凝土圈梁和预应力锚索进行锁脚;下部弱风化岩层采用锚喷支护体系.通过对多支点排桩支护结构进行计算分析和施工实践,验证了该支护体系对基坑的防护效果.
In view of the soft and hard formation characteristics of open-digging foundation pit in vertical shaft of comprehensive pipe gallery project in Yanqing district of Winter Olympic Games,multi-fulcus pile-laying support technology is adopted in upper pebble and strongly weathered rock stratum,reinforced concrete crown beam and support are set up on the top of retaining pile,the bottom of pile is entered into weakly weathered rock stratum,and the concrete ring beam and prestressed anchor cable are used to lock the foot.bolting and shotcreting support system is used in the lower weak weathered rock strata.Through the calculation and analysis of construction practice of multi-fulcus row pile supporting structure,the protective effect of this support system on foundation pit is verified.
出处
《智能城市》
2020年第10期62-64,共3页
Intelligent City
关键词
明挖基坑
围护结构
吊脚桩
锚索
锁脚
open excavation
retaining structure
hanging pile
anchor cable
locking foot
