适用快速施工的桥梁承台加固用钢吊箱围堰结构设计

Structural design of steel hanging box cofferdam for strengthening bridge cap in rapid construction

加固用围堰设计面临着"限高度、大流速、高潮差"的复杂作业困境以及钢吊箱围堰基础加固施工所存在的封底困难、混凝土和钢材浪费严重、钢板周转率低、拼装慢且拆除难等普遍问题。本文以某大桥桥墩基础加固工程为背景,通过对钢吊箱的侧壁模数化合理划分与设计,并以凹槽与凸榫快速承插式的连接,实现任意钢吊箱结构尺寸的模数化快速拼装,极大地降低了起吊拼装技术要求,提高了拼装效率和钢吊箱重复周转利用率。同时,通过数值分析和现场监测,验证了该结构的有效性。

The design of cofferdam for reinforcement is faced with complex environmental conditions such as"limited height,large flow rate and high tidal range",as well as common problems such as bottom sealing difficulties,serious waste of concrete and steel,low turnover of steel plate,slow assembly and difficult demolition in reinforcement construction of steel cofferdam foundation.Based on a bridge pier foundation strengthening project,through the rational division and design of the side wall of the steel lifting box,and the connection of the groove and the fast socket type,this paper realizes the modular rapid assembly of any steel lifting box structure size,greatly reduces the technical requirements of lifting and assembling,and improves the assembly efficiency and the repeated turnover ratio of the steel lifting box.At the same time,the effectiveness of the structure is verified by numerical analysis and field monitoring.