摘要
介绍了钻孔灌注桩后注浆技术的发展现状、适用范围及作用机理。以郑州市三环线快速化工程为例,介绍了钻孔灌注桩后注浆的静载试验、施工工艺、注浆参数、技术要求等,同时通过工程数据说明其经济效益。采取桩基后注浆技术后,钻孔灌注桩的竖向抗压承载力得到了显著提高。在承载力要求相同时,可以缩短桩长或缩小桩径,大幅降低工程造价。
This paper introduces the development situation, application scope and function mechanism of cast-in-place pile post-grouting technology. Taking Zhengzhou Ring Line Ⅲ Expressway Project as an example, this paper introduces the static load test, construction technology, grouting parameter and technical requirement of this technology, and meanwhile explains its economic benefit by the engineering data. The vertical compression bearing capacity of cast-in-place pile is greatly improved after the use of pile foundation post-grouting technology. The pile length can be shortened or the pile diameter can be decreased at the same requirements of bearing capacity, which greatly reduce the engineering cost.
作者
李永治
吴纪东
Li Yongzhi;Wu Jidong
出处
《城市道桥与防洪》
2019年第5期210-214,M0023,共6页
Urban Roads Bridges & Flood Control
关键词
后注浆
作用机理
注浆参数
静载试验
post-grouting
function mechanism
grouting parameter
static load test
