跨海大桥桥墩大体积混凝土温控  

Research on Temperature Control of Mass Concrete for Piers of Cross Sea Bridge

作　　者：郭欣 刘恒 李立坤 毛奎 汪建群[2] GUO Xin;LIU Heng;LI Likun;MAO Kui;WANG Jianqun(CCCC-SHEC Second Highway Engineering Co.,Ltd.,Xi'an 710019,China;School of Civil Engineering,Hunan University of Science and Technology,Xiangtan 411201,China;CCCC-SHEC First Highway Engineering Co.,Ltd.,Wuhan 430014,China)

机构地区：[1]中交二公局第二工程有限公司,陕西西安710119 [2]湖南科技大学土木工程学院,湖南湘潭411201 [3]中交二公局第一工程有限公司,湖北武汉430014

出　　处：《湖南科技大学学报（自然科学版）》2023年第2期48-57,共10页Journal of Hunan University of Science And Technology：Natural Science Edition

基　　金：国家自然科学基金资助项目(51408218);湖南省科技厅项目资助(14JJ2094,18A202)。

摘　　要：实心桥墩为典型的大体积混凝土制件,其温控容易被忽视,因此,在施工过程中容易产生温致裂缝.跨海大桥桥墩面临海水和浪溅工作环境,桥墩裂缝将影响结构的耐久性和安全性.以深中通道非通航孔桥为工程背景,对跨海大桥桥墩大体积混凝土进行了温控研究.该桥为(89×90)m长联多跨桥梁,采用整体式现浇桥墩,翻模法施工,模板周转周期快,拆模时间短;施工面临大风、潮汐和昼夜温差大的环境;桥墩为扁平结构,表面失温快,保温困难;上述条件均不利于大体积混凝土的施工养护.文章从配合比设计和冷却管布置等方面对桥墩大体积混凝土进行了温控优化设计,并模拟施工全过程进行了有限元分析,结果表明:实测与仿真吻合良好.温控方法节约了造价,节省了工期,相关优化思路可为桥墩大体积混凝土施工提供参考.Solid bridge piers are typical mass concrete parts,but their temperature control is easily ignored,so temperature induced cracks are prone to occur during the construction process.The piers of cross sea bridges work in the environments of seawater and waves.Thus,the cracks in the piers will affect the durability and safety of the structure.Taking the non-navigable span bridge of the Shenzhong Link as the engineering background,temperature control research is conducted on the mass concrete of the pier of the cross sea bridge.The bridge is(89x90)m long multi-span bridge,using integral cast-in-place piers and flip formwork construction method,with fast formwork turnover cycle and short formwork removal time.Construction faces environments with heavy winds,tides,and large temperature differences between day and night.The bridge pier is a flat structure,which causes rapid surface temperature loss and difficulty in insulation.The reasons mentioned above are not conducive to the construction and maintenance of large volume concrete.This paper optimizes the temperature control design of large volume concrete for bridge piers from the aspects of mix proportion design and cooling pipe layout,and simulates the entire construction process for finite element analysis.Results show that the measured and simulated results are in good agreement.The temperature control method in this paper has saved money and time.The relevant optimization ideas can provide references for the construction of large volume concrete for bridge piers.

关 键 词：大体积混凝土 桥墩 配合比设计 冷却管布置 仿真分析 

分 类 号：U455.4[建筑科学—桥梁与隧道工程]