深圳沿江高速前海湾浅水非自浮沉管隧道关键技术创新  

Key Technology Innovation of Shallow Water Non-self-floating Immersed Tunnel at Shenzhen Yanjiang Expressway in Qianhaiwan

作　　者：王勇[1] 徐国平[1] 梁杰忠[2] 刘洪洲[1] 陈伟彬[2] 龚毅 卢志楷 WANG Yong;XU Guoping;LIANG Jiezhong;LIU Hongzhou;CHEN Weibin;GONG Yi;LU Zhikai(CCCC Highway Consultants Co.,Ltd.Beijing 100088;CCCC Fourth Harbour Engineering Co.,Ltd.Guangzhou 510000)

机构地区：[1]中交公路规划设计院有限公司,北京100088 [2]中交第四航务工程局有限公司,广州510000

出　　处：《现代隧道技术》2020年第S01期40-51,共12页Modern Tunnelling Technology

摘　　要：文章结合深圳沿江沉管隧道建设条件及项目特点,系统论述了浅水非自浮沉管隧道的管节结构类型及浮力体系选型、管节长度及纵向体系确定、管节快速预制及舾装、浅吃水半潜驳干式运输及管船协同变形控制、较大负浮力状态的槽内移运及沉放对接等成套关键技术和创新成果。研究结果表明:(1)对于浅水浅埋沉管管节结构选型,宜结合工程质量保障、风险控制、工期造价等综合选定;(2)对于湿拖作业距离短、水上作业条件好、移运风险可控的沉管隧道,可选用非自浮管节体系;可结合工序工期需求、船机装备、移运沉放风险控制等综合确定浮运期的管节负浮力系数;(3)管节最优长度可通过结构安全、工期、造价等评价指标综合评分定量确定;(4)通过采用工厂法通长内模全断面顺浇预制技术,配合温度调节辅助措施,可有效提升整体式管节预制质量、控制大体积混凝土浇筑裂缝、提升预制工效;通过采用装配式端封门、轻量化简易测量塔、取消压载水系统等技术,可实现非自浮管节快速舾装;(5)采用大载重浅吃水半潜驳干式运输可有效应对浅水沉管移运问题;通过运用自适应液压台车、橡胶支墩、不均匀压载等技术,可解决在上驳、移运、下驳过程中的管船变形协同和管节结构控裂问题;(6)通过采用大吊力浅吃水骑吊驳可便捷匹配半潜运输工艺,可有效应对非自浮沉管的运输和安装;(7)浅水非自浮沉管成套关键技术和创新成果,实现了沉管隧道在浅水环境中的应用,填补了非自浮沉管的技术空白,对于拓展沉管法隧道适用性、完善沉管法隧道技术体系具有重要意义。Combining with the construction conditions and project characteristics of the immersed tunnel on Yanjiang expressway in Shenzhen,this paper systematically discusses the complete set of key technologies and innovative results of shallow water non-self-floating immersed tunnel,such as element structure type and buoyancy system selection,element length and longitudinal system determination,element quick prefabrication and outfitting,shallow draft semi-submersible barge dry transportation and coordinated deformation control,element movement and sinking with large negative buoyancy,etc.The research results show that:(1)for the selection of shallow water and shallow buried immersed tunnel structure,it is advisable to make a comprehensive selection based on project quality assurance,risk control,construction period and cost,etc;(2)for the immersed tunnel with short operation distance,good water operation conditions and controllable transportation risks,a non-self-floating element system can be selected;the negative buoyancy coefficient of the element during the floating transportation period can be comprehensively determined according to the requirements of the process construction period,ship machinery equipment,and risk control during transportation and sinking;(3)the optimal length of the element can be quantitatively determined through the comprehensive scores of evaluation indicators such as structural safety,construction period,cost,etc;(4)through the usage of factory-method through-length internal mold full-section cast-in-sequence prefabrication technology,combined with temperature adjustment auxiliary measures,it can effectively improve the overall quality of prefabricated element,the control of large-volume concrete pouring cracks,and the improvement of prefabrication efficiency;the rapid outfitting of non-self-floating elements can be realized by the usage of prefabricated end-sealing doors,lightweight and simple measuring towers,and the elimination of ballast water systems;(5)the problem of shallow-water tra

关 键 词：沉管隧道 浅水 非自浮 选型设计 

分 类 号：U459.9[建筑科学—桥梁与隧道工程]