输水盾构隧洞内衬自密实混凝土施工技术  

Construction Technologies of Self-compacting Concrete for Lining of Water Conveyance Shield Tunnel

作　　者：石爱军[1,2,3] 汪永剑 姚楚康[1,2,3] 谢祥明 伍玉龙 蔡怡欣[1] SHI Aijun;WANG Yongjian;YAO Chukang;XIE Xiangming;WU Yulong;CAI Yixin(Guangdong No.2 Hydropower Engineering Company,Ltd.,Guangzhou 511340,China;Guangdong Engineering Technology Research Center of New Materials and Structures,Guangzhou 511340,China;Guangdong Engineering Technology Research Center of Water Resources and Hydropower,Guangzhou 511340,China)

机构地区：[1]广东水电二局股份有限公司,广东广州511340 [2]广东省新材料与结构工程技术研究中心,广东广州511340 [3]广东省水利水电工程技术研究中心,广东广州511340

出　　处：《人民珠江》2022年第1期36-41,55,共7页Pearl River

基　　金：广东省重点领域研发计划(第四批)项目(2019B111108001)。

摘　　要：针对输水盾构隧洞复合衬砌中自密实混凝土井内高落差垂直运输、洞内长距离水平运输、密闭环形结构入仓、浇筑等施工难题,选用合适的自密实混凝土运输方法和入仓方式,通过模拟试验确定内衬钢管(内模)上的自密实混凝土浇筑孔间距,根据复合衬砌结构特性及自密实混凝土施工性能进行计算分析,合理确定浇筑段长度、分层厚度、入仓速度等浇筑工艺及质量控制措施。在珠三角水资源配置工程深圳分干线(试验项目)上应用,自密实混凝土运输过程骨料不分离、浇筑过程内衬钢管不上浮、未侧移,钻孔取芯结果表明,自密实混凝土的脱空高度(自密实混凝土与拱顶外衬管片之间的空隙)满足设计要求,在回填注浆后密闭环形内衬空间填充饱满,复合衬砌自密实混凝土质量良好,可供同类工程施工参考。Some problems exist in the construction of composite lining of water conveyance shield tunnel,such as vertical transportation of self-compacting concrete(SCC)in deep work shafts,long-distance horizontal transportation of SCC in tunnels,and placing and casting of SCC in closed ring structures.In response to them,a transportation method and a placing mode suitable for SCC were chosen.The spacing of casting holes on the lined steel pipe(inner mold)was reasonably determined for SCC through a simulation test.Depending on the characteristics of the composite lining structure and the construction performance of SCC,related calculations and analyses are carried out for reasonable determination of the casting process and quality control measures such as the length of casting section,layer thickness,and placing speed.The determined parameters were applied in the pilot project of Shenzhen main branch of the Water Resources Allocation Project in the Pearl River Delta.We found that no aggregate separation occurred during the transportation of SCC,and the lined steel pipe did not float up or drift sideward during the casting of SCC.The drilling and coring test results showed that the height of the void between SCC and outer lining segment on the vault met the design requirements,and the lining space of closed ring structures was filled after backfilling and grouting.These results indicate that the SCC of composite lining is of good quality.Relevant construction technologies can provide references for the construction of similar projects.

关 键 词：输水隧洞 复合衬砌 自密实混凝土 运输方法 浇筑工艺 

分 类 号：TV314[水利工程—水工结构工程]