新型桩-墙咬合圆形锚碇基坑支护施工关键技术研究  

Research on Key Technologies of New Pile-wall Occluded Circular Anchorage Pit Supporting Construction

作　　者：卢焕然 LU Huanran

机构地区：[1]上海远方基础工程有限公司,上海市200436

出　　处：《城市道桥与防洪》2022年第11期178-181,I0017,共5页Urban Roads Bridges & Flood Control

摘　　要：圆形基坑支护结构在开挖期间具有良好的受力特性,在大型锚碇基础基坑支护中较为常用。根据某大桥东锚碇基坑支护工程对新型桩-墙咬合圆形锚碇基坑支护施工工艺进行施工过程关键技术研究,结果表明:桩基施工作为Ⅰ期施工段,地下连续墙施工作为Ⅱ期施工段。Ⅰ期桩基施工应跳槽施工,Ⅱ期地连墙施工时应减少与Ⅰ期桩基混凝土龄期差;钢导墙代替常规导墙能有效缩短工期,避免常规导墙制作的繁琐工艺。The circular foundation pit support structure has the good mechanical characteristics during excavation and is more commonly used in the foundation pit supporting of large anchorage foundation.According to the east anchorage foundation pit supporting project of a bridge,the key technologies of the new pile-wall occluded circular anchorage pit supporting in the construction process are studied.The results show that the pile foundation construction is used as the first phase of construction,and the construction of underground diaphragm wall is used as the second phase of construction.The pile foundation construction of the first phase should be"job-hopping"construction,and when the underground diaphragm wall of the second phase is constructed,the age difference with the pile foundation concrete of the first phase should be reduced.The steel guide wall can effectively shorten the construction period instead of the conventional guide wall,which avoids the tedious process of manufacturing the conventional guide wall.

关 键 词：桩-墙咬合 施工工艺 关键技术 地下连续墙 钢导墙 

分 类 号：TU473.2[建筑科学—结构工程]