摘要
常德—益阳—长沙铁路跨沅江大桥主桥桩基础采用先桩后堰法施工。从围堰设计、围堰拼装平台搭设与底节围堰原位拼装、围堰下放系统及导向系统设置、围堰下放、吸泥下沉、智能监控六个方面介绍了深水大直径超高双壁钢围堰设计和施工技术。经实践验证,双壁钢围堰工厂内分块制作、现场拼装,有利于围堰加工质量控制;采用先桩后堰法施工,先搭设水上钻孔施工平台,待桩基施工完成后对平台进行改造,用于双壁钢围堰整体拼装,有利于拼装精度控制;利用永久桩及辅助桩接长钢护筒作为双壁钢围堰整体下放系统和导向系统的支撑,解决了围堰底节下沉难题;智能化监控系统对围堰姿态、壁板应力及围堰内外水位差的实时监控和反馈,解决了在深水下沉过程中围堰受力过大等问题。
The pile foundation of the main bridge of Changde-Yiyang-Changsha railway bridge crossing Yuanjiang is constructed by the method of pile first and then cofferdam.The design and construction technology of large diameter super high double-wall steel cofferdam in deep water are introduced from six aspects,including that cofferdam design,cofferdam assembly platform erection and in-situ assembly of bottom section cofferdam,cofferdam lowering system and guidance system setting,cofferdam lowering,mud suction sinking and intelligent monitoring.It is proved by practice that the block processing and on-site assembly of double-wall steel cofferdam in the factory are conducive to the quality control of cofferdam processing.The construction method of pile first and then cofferdam is adopted.The water drilling construction platform is erected first.After the pile foundation construction is completed,the platform is transformed for the integral assembly of double-wall steel cofferdam,which is conducive to the control of assembly accuracy.The permanent pile and auxiliary pile are used to lengthen the steel casing as the support of the whole lowering system and guiding system of double-wall steel cofferdam,which solves the sinking problem of the bottom section cofferdam.The intelligent monitoring system monitors and feeds back the cofferdam attitude,wall plate stress and water level difference inside and outside the cofferdam in real time,which solves the problems of excessive stress on the cofferdam in the sinking process in deep water.
作者
王勇
易先坤
郭星亮
WANG Yong;YI Xiankun;GUO Xingliang(China Railway No.3 Engineering Group Co.Ltd.,Taiyuan 030001,China;Bridge&Tunnel Engineering Company of China Railway No.3 Engineering Group Co.Ltd.,Chengdu 610000,China)
出处
《铁道建筑》
北大核心
2021年第12期44-47,共4页
Railway Engineering
基金
中国中铁股份有限公司科技研究开发计划(2020-引导-19)
中铁三局集团有限公司2020年度科技研究开发计划(K20-重大-5)。
关键词
铁路桥梁
拼装下放
现场试验
双壁钢围堰
分块加工
下放系统
吸泥下沉
智能监控
railway bridge
assembling and lowering
field test
double-wall steel cofferdam
block processing
lowering system
mud suction sinking
intelligent monitoring
