摘要
深中通道西人工岛处于外海环境,岛上现浇隧道结构尺寸大,断面宽度及墙身高度呈渐变形式。施工过程中,为确保隧道主线临时通行需求,对敞开段隧道结构墙体进行部分预留,待交通转换后进行浇筑封闭。因其龄期间隔时间长,新老混凝土间易因收缩不同步造成结构开裂。为降低混凝土开裂风险,确保海工混凝土结构耐久性,对外海现浇隧道后浇筑墙体开展系统性控裂研究,通过采用有限元仿真模拟分析、研发智能温控系统、辅以温控硬件措施投入等综合控裂措施,实现后浇筑墙体控裂目标,有效避免了墙体有害裂缝的发生。
The west artificial island of Shenzhen-Zhongshan Link is located in an offshore environment.The structure size of the cast-in-place tunnel on the island is large,and the section width and the height of the wall body are in gradual changes.During the construction process,in order to ensure the temporary traffic demand of the main line of the tunnel,part of the structural wall of the open tunnel is partially reserved to be poured and closed after traffic conversion.Due to the long time interval between ages,it is easy for cracks to occur in the structure because of asynchronous shrinkage between the old and new concrete.In order to reduce the risk of concrete cracking and ensure the durability of offshore concrete structures,a systematic crack control study was carried out on the post-casting wall of the offshore cast-in-place tunnel.Through comprehensive crack control measures such as finite element simulation analysis,intelligent temperature control system development,and supplemented by investment in temperature control hardware measures,the goal of post-casting wall crack control was achieved,effectively avoiding harmful cracks in the wall.
作者
郑伟涛
王从李
王朔
刘帅
ZHENG Wei-tao;WANG Cong-li;WANG Shuo;LIU Shuai(No.1 Engineering Co.,Ltd.of CCCC First Harbor Engineering Co.,Ltd.,Tianjin 300456,China)
出处
《中国港湾建设》
2024年第7期28-33,共6页
China Harbour Engineering
基金
中交集团院士专项项目(YSZX-2023-02)。
关键词
深中通道
西人工岛
后浇筑墙体
大体积混凝土
控裂
Shenzhen-Zhongshan Link
west artificial island
post-casting wall
mass concrete
control crack
