港珠澳大桥珠海连接线拱北隧道工作井施工技术研究

Working Shaft Construction Technique in Gongbei Tunnel for Zhuhai Link of Hong Kong-Zhuhai-Macao Bridge

港珠澳大桥珠海连接线拱北隧道工作井是该工程最先开工和最后完工的特殊结构。介绍了工作井的设计概况,所处的地质条件和周边环境,并根据工程特点对超深工作井施工过程中的主要风险点进行分析,研究出相应的控制风险的关键施工技术措施,从而克服了超深地下墙施工、超深工作井降水及开挖、管幕施工等多项技术难关,有力保证了工程的顺利完成,其中相关经验可为类似工程施工提供借鉴。

Work shaft of Gongbei Tunnel of Zhuhai Link of Hong Kong-Zhuhai-Macao Bridge is the first start of the project and the final completion of the special structure. This paper introduces design work well before,in which geological conditions and surroundings,and according to the project analysis of the characteristics of the ultra-deep wells during the construction work of the main risk areas,develops the corresponding key construction technical measures to control risks,thereby overcomes the ultra-deep underground wall construction,ultra-deep well precipitation and excavation work,pipe curtain construction and many other technical difficulties,which effectively guarantee the successful completion of the project,in which the relevant experience can provide reference for similar construction.