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针对长江隧桥B1标浅滩区28座高桩承台,充分考虑长江口所处施工环境特点,对多种围堰方案进行了技术经济分析,选取了混凝土底板钢吊箱。该围堰由混凝土底板、钢吊箱壁板及内支撑、吊挂系统(下沉系统)等组成,壁板和底板是围堰的主要阻水结构并兼作承台模板,具有施工周期短、周转材料投入少和施工风险低的特点。根据最不利工况,确定了底篮、吊挂系统和封底混凝土;采用三维有限元方法,对吊箱结构的受力和变形进行了模拟分析,分析结果表明各构件应力和变形均在允许范围内。
According to the characteristics of the construction environment in the Yangtze River estuary B1, 28 high-pile capstans in the B1 shoal of the Yangtze River Bridge, the technical and economic analyzes of various cofferdam schemes were carried out, and the concrete floor steel cage was selected. The cofferdam is composed of a concrete floor, a steel hanging box wall, an inner support and a hanging system (sinking system), and the wall and the floor are the main water blocking structures of the cofferdam and also serves as a template for the platform, which has the advantages of short construction period, Turnover materials less investment and construction of low risk characteristics. According to the most unfavorable condition, the bottom basket, suspension system and back cover concrete were determined. The three-dimensional finite element method was used to simulate the stress and deformation of the box structure. The analysis results showed that the stress and deformation of each component were within the allowable range Inside.