摘要
为解决桩基因地质环境复杂、成桩易出现塌孔、卡钻、钢护筒倾斜等问题,文中结合双屿门通航孔桥六横侧的主塔桩基,设计了不同直径的钻孔钻头,有效解决了复杂地形条件下大直径钻孔灌注桩成桩困难等问题。结果表明设计的4种不同直径钻头能够有效保证成孔质量,并通过改进永久钢护筒、提升钢筋笼施工工艺、采取导管限位操作平台和连接定位架等手段,解决了永久钢护筒安装难度大、混凝土浇筑困难等问题,极大降低此工程中大直径钻孔灌注桩的施工难度,提升了施工效率,为今后的类似工程提供参考。
The main tower piles at the six transverse spans of the Shuangyumen navigation hole bridge are taken to address issues such as borehole collapse,stuck drilling tools,and steel casing inclination caused by complex geological conditions during pile foundation construction.Different diameters of drill bits were designed to effectively overcome the difficulties in constructing large-diameter bored piles under complex terrain conditions.The results show that the four designed drill bits can effectively ensure borehole quality.Additionally,by improving the permanent steel casing,enhancing the reinforcement cage installation process,and adopting measures such as a conduit limiting operation platform and connecting positioning frame,difficulties in installing permanent steel casings and concrete pouring were resolved.These innovations greatly reduce the construction challenges of large-diameter bored piles in this project,improve construction efficiency,and provide valuable references for similar future projects.
作者
刘贺
赵鑫
杨涛
甄东起
黄冲
LIU He;ZHAO Xin;YANG Tao;ZHEN Dongqi;HUANG Chong(China Railway Construction Bridge Engineering Bureau Group 1ST Engineering Co.,Ltd.,Liaoning Dalian 116021,China)
出处
《低温建筑技术》
2025年第7期74-77,共4页
Low Temperature Architecture Technology
基金
中国铁建股份有限公司2023年度科技研发计划(2023-B10)
2023年度中国铁建大桥局科技创新项目开发计划(DQJ-2023-A04)
中国铁建股份有限公司2022年度科技研发计划(2022-B05)。
关键词
超大跨度悬索桥
钻孔灌注桩
永久钢护筒
水下混凝土浇筑
super-span suspension bridge
bored cast-in-place pile
permanent steel casing
underwater concrete pouring
