厂房内圆形超深设备基坑双层咬合桩支护及挖土施工技术  

Construction Technology of Double-layer Secant Pile Support and Excavation for the Circular and Ultra-deep Equipment Foundation Pit in the Factory Building

作　　者：张程宝 潘伟峰 华锦耀 ZHANG Chengbao;PAN Weifeng;HUA Jinyao(Ningbo Metallurgical Survey and Design Research Co.,Ltd.,Ningbo,Zhejiang 315040,China;Darong Construction Group Co.,Ltd.,Ningbo,Zhejiang 315192,China;Zhejiang Hongchen Construction Co.,Ltd.,Ningbo,Zhejiang 315032,China)

机构地区：[1]宁波冶金勘察设计研究股份有限公司,浙江宁波315040 [2]大荣建设集团有限公司,浙江宁波315192 [3]浙江鸿晨建设有限公司,浙江宁波315032

出　　处：《建筑施工》2021年第5期784-786,共3页Building Construction

摘　　要：以某公司厂房内超深设备基坑工程为背景,针对厂房内超深设备基坑平面尺寸较小且邻近厂房柱基础的特点,对圆形超深设备基坑应用的双层咬合桩(即双圆环式钻孔灌注咬合桩)支护及挖土施工技术进行了总结。通过采用双层咬合桩、高压旋喷桩截水帷幕作为超深设备基坑的围护结构,以及逆作式施工设备基础侧壁,成功地解决了厂房狭小空间内施工的难题,保护了邻近厂房柱基础,控制了既有设备基础的变形位移,施工效果良好,可为类似工程施工提供技术参考。Taking the ultra-deep equipment foundation pit project in the factory of a certain company as the background,based on the characteristics of the small plane size of the ultra-deep equipment foundation pit in the workshop and the adjacent plant column foundation,the double-layer secant pile applied to the circular ultra-deep equipment foundation pit(i.e.double-ring bored cast-in-place secant pile)support and excavation construction technology is summarized.By adopting double-layer secant piles and high-pressure jet-grouting pile interception curtains as the support structure of the ultra-deep equipment foundation pit,as well as the side walls of the top-down construction equipment foundation,successfully solved the construction problems in the narrow space of the factory building,protected the adjacent plant column foundation,and controlled the deformation and displacement of the existing equipment foundation.The construction effect is good,which can provide technical reference for the construction of similar projects.

关 键 词：狭小空间 超深设备基坑 双层咬合桩 高压旋喷桩 围护结构 

分 类 号：TU753[建筑科学—建筑技术科学]