深水高桩系梁新型单壁钢吊箱围堰施工关键技术研究  

Key Technology for Construction of New Single‑Wall Steel Suspended Box Cofferdam with High Pile Tied Beams in Deep Water

作　　者：杨金龙[1] 赵林 江群龙 YANG Jinlong;ZHAO Lin;JIANG Qunlong(CCCC Second Harbor Engineering Company Ltd.,Wuhan,Hubei 430040,China)

机构地区：[1]中交第二航务工程局有限公司,湖北武汉430040

出　　处：《中外公路》2024年第6期219-225,共7页Journal of China & Foreign Highway

基　　金：中交第二航务工程局有限公司科技研发项目(编号:EHYF-2021-B-05-037)。

摘　　要：为确保安全、高效、经济地完成暮坪湘江特大桥深水高桩系梁施工,该文针对高桩系梁所在位置水位深、地层覆盖层浅的特点,结合项目实际情况,设计出一种新型单壁钢吊箱围堰来作为高桩系梁施工时的挡水与围护结构。通过在钢吊箱围堰底板上设置钢套管的创新设计,降低了壁板设计高度,节省了钢材投入量;在创新设计的基础上,优化封底施工工艺,区别于传统钢吊箱满封底施工工艺,新型单壁钢吊箱围堰仅需在钢套管内浇筑封底混凝土,在满足结构受力与体系稳定的前提下,大幅度减少了封底混凝土方量,节省了施工成本;通过在封底混凝土表层加焊劲板的方式,提升了整个结构体系的稳定性,进一步保障了水中作业安全。水中桩系梁施工效果较好,表明新型单壁钢吊箱围堰较适用于深水高桩系梁施工。In order to ensure the safe,efficient,and economical completion of the construction of the high pile tied beam of Muping Xiangjiang River Bridge in deep water,a new type of single-wall steel suspended box cofferdam was designed to act as the water retaining and enclosure structure during high pile tied beam construction according to the characteristics of deep water level and shallow stratum cover layer at the high pile tied beam location.Through the innovative design of steel casing on the bottom of the steel suspended box cofferdam,the design height of the wall panel and the amount of steel input were reduced.On the basis of innovative design,the bottom sealing construction process was optimized.Different from the traditional full bottom sealing construction process of the steel suspended box,the new single-wall steel suspended box cofferdam only needed to pour the bottom sealing concrete in the steel casing,which greatly reduced the amount of bottom sealing concrete and saved the construction cost under the premise of satisfying the structural force and system stability.The stability of the whole structure system was enhanced by welding the stiffening plate on the surface of the bottom sealing concrete,and the safety of operation in water was further guaranteed.The construction effect of pile tied beams in water was good,which indicated that the new single-wall steel suspended box cofferdam was more suitable for the construction of high pile tied beams in deep water.

关 键 词：桥梁工程 高桩系梁 钢吊箱围堰 力学性能 数值模拟 施工技术 

分 类 号：U445.556[建筑科学—桥梁与隧道工程]