裸岩浅埋无封底PC组合围堰设计与施工关键技术  

Key Design and Construction Technologies for PC Combined Cofferdam on Shallow-Buried Bare Rock Without Bottom Cover

作　　者：卢文 LU Wen(Railway Combat Readiness Pontoon Bridge Division,Qihe 251100,China)

机构地区：[1]铁道战备舟桥处,山东齐河251100

出　　处：《国防交通工程与技术》2025年第1期65-69,共5页Traffic Engineering and Technology for National Defence

摘　　要：潍宿高铁墙夼水库特大桥53#~55#水中墩承台基础为挖井基础,墩位处最大水深为6.6 m,围堰内河床岩层为砂岩,基本无覆盖层。54#墩的承台施工采用钢管桩与钢板桩组合围堰,针对裸岩浅埋无封底围堰的施工特点,通过建模分析各个工况下围堰体系的变形与受力情况,表明围堰结构及整体稳定性安全。无封底钢管桩与钢板桩组合围堰的综合性施工难度较大,介绍铣槽、沉桩、基槽内清淤、柱脚锚固浇筑等关键施工技术,现场实施效果良好。The foundation of Piers 53#to 55#in the Weifang-Suqian High-Speed Railway Qiangkuang Reservoir superstructure utilize dug-well foundations.At the pier locations,the maximum water depth reaches 6.6 meters,and the riverbed rock strata within the cofferdam consist of sandstone with virtually no overburden layer.For Pier 54#,the construction of the cap foundation employs a combined cofferdam system of steel pipe piles and steel sheet piles.Considering the construction characteristics of unlined cofferdams on shallow-buried bare rock without bottom covers,the deformation and stress conditions of the cofferdam system under various working conditions were analyzed through modeling.The analysis demonstrates that the structural integrity and overall stability of the cofferdam are secure.Constructing unlined PC combined cofferdams using steel pipe piles and steel sheet piles presents significant challenges.This study introduces key construction techniques such as milling grooves,pile sinking,silt removal within foundation trenches,and the pouring of column base anchorage.The on-site implementation of these techniques yielded favorable results,ensuring the successful and safe construction of the cofferdam system.

关 键 词：裸岩浅埋 无封底 PC组合围堰 结构设计 铣槽 柱脚锚固 混凝土浇筑 

分 类 号：U445.556[建筑科学—桥梁与隧道工程]