桥梁深水基础钢箱围堰施工技术浅析

Analysis of construction technology of steel box cofferdam in deep water foundation of bridge

结合武汉鹦鹉洲长江大桥2#中塔基础工程实例,对桥梁深水基础钢箱围堰的总体施工方案、围堰设计、施工关键技术进行分析和阐述,其中:桥梁深水基础总体方案的选择,应结合项目的工程特点(如基础埋深、工期等)和施工条件(如水文、地质等),经过技术、经济比选后确定;围堰设计除满足受力要求外,还应重点对下沉系数、封底厚度进行计算和校核;围堰吸泥下沉应根据围堰入水深度和地质情况,选择合适的吸泥设备,也可考虑多种吸泥设备联合作业。

Combined with Wuhan parrot island Yangtze River bridge 2# tower foundation engineering examples,to analyze and elaborate the overall construction scheme,cofferdam design and construction key technology of the steel box cofferdam in deep water foundation.Among them： the choice of the overall plan of the deep foundation of the bridge should be combined with the project characteristics （such as the foundation depth,construction period,etc） and construction conditions （such as hydrology, geology,etc）,after technical and economic comparison;Cofferdam design in addition to meet the requirements of stress, the focus should be calculated and checked on subsidence coefficient,cover thickness;According to the depth and the geological condition of the cofferdam, the cofferdam suction mud should be selected and the appropriate suction equipment can be chosen.