南昌红谷隧道沉管外包防水施工技术  

Construction Technology for Enclosed Waterproofing of Honggu Immersed Tunnel in Nanchang

作　　者：黄学军[1] 

机构地区：[1]中铁隧道集团二处有限公司,河北三河065201

出　　处：《隧道建设》2016年第9期1125-1131,共7页Tunnel Construction

基　　金：中铁隧道集团科技创新计划重大课题(隧研合2014-04)

摘　　要：沉管隧道管段结构防水关系到隧道后期运营及使用寿命,一旦渗漏,修复难度非常大。以南昌红谷隧道为例,采用"防水底钢板+顶板、侧墙喷涂聚合物水泥防水涂层"的外包防水施工技术:防水底钢板采用6 mm厚带锚筋钢板,能够减小管底吸附力,保证管段顺利起浮;顶板、侧墙选用兼有有机和无机防水涂料优点的聚合物水泥防水涂层,采用"一布四涂"大面积机械喷涂施工工艺,工效快、成本低、质量好。通过错缝焊接底钢板、改善锚筋锚固形式、薄弱部位强化处理、加强试验检测等施工方法和技术措施,有效改善外包防水施工质量,降低管段渗漏水风险,为今后沉管隧道外包防水设计及施工提供参考。The waterproofing quality of immersed tunnel segment has a significant influence on tunnel operation safety and tunnel service life. The enclosed waterproofing technology of ＂waterproofing base steel plate ＋ spraying polymer cement on roof and sidewall＂ is adopted in Honggu Immersed Tunnel in Nanchang. The technologies include ： 1 ） Use steel plate of 6 mm with anchor to reduce adsorption force. 2 ） Polymer cement spraying on roof and sidewall. The enclosed waterproofing technologies are improved by staggered joints welding of base steel, changing the connection mode of anchor bar, reinforcing of weak points and strengthening test and monitoring.

关 键 词：沉管隧道 外包防水 防水底钢板 聚合物水泥防水涂层 

分 类 号：U455[建筑科学—桥梁与隧道工程]