摘要
以武汉市长江I级阶地某临江深基坑工程为依托,分析对比TRD工法、CSM工法和液压抓斗工法水泥土墙应用范围、优势与不足,总结液压抓斗法嵌岩水泥土墙施工流程、关键技术及质量控制要点,研究结果表明:针对轮廓不规则基坑,帷幕深度范围内有深厚卵石层且需进入基岩层,采用液压抓斗工法有其设计与施工优势;槽壁垂直度为施工关键点,通过确保成槽前、成槽中使抓斗主机开行方向、抓斗斗体中心、槽轴线一致,确保成槽垂直度;需现场试验确定水泥土泌水率,计算水泥土浆高度缩减量,按照计算在浆体到达距顶部一定深度时,暂停注浆,数小时后再将槽中注满。
Based on a deep foundation excavation project on the Yangtze River in Wuhan,the application range,advantages and disadvantages of TRD method,CSM method and hydraulic grab method for cement-soil wall are analyzed and compared.The construction process,key technology and quality control points of rock-socketed cement-soil wall by hydraulic grab method are summarized.The following experiences are obtained,which can be used for reference for similar projects.Aiming at irregular foundation with outline,there are deep pebble layers in the depth range of excavation and curtain,and they need to enter the bedrock stratum.The hydraulic grab method has its advantages in design and construction.The verticality of groove wall is the key point in construction,which ensures the verticality of grooving by ensuring that the direction of grab main engine,the center of grab body and the axis of groove are consistent before and during grooving.Field tests are needed to determine the cement-soil bleeding rate and calculate the height reduction of cement-soil slurry.According to the calculation,when the slurry reaches a certain depth from the top,the grouting is suspended and the tank is filled after several hours.
作者
张松波
黄晓程
张晋华
文滔
黄心颖
ZHANG Songbo;HUANG Xiaocheng;ZHANG Jinhua;WEN Tao;HUANG Xinying(Hubei Building Construction Technology Co.,Ltd.of CCTEB Group Co.,Ltd.,Wuhan,Hubei 430070,China;General Construction Company of CCTEB Group Co.,Ltd.,Wuhan,Hubei 430064,China)
出处
《施工技术》
CAS
2020年第4期58-62,共5页
Construction Technology
关键词
基础
基坑
水泥土墙
止水帷幕
施工技术
foundations
foundation excavation
cement-soil wall
waterproof curtain
construction
