港口航道与近海工程2024，Vol.61Issue(4)：111-118,8.DOI:10.16403/j.cnki.ggjs20240423
桥梁巨型承台围堰设计及施工关键技术研究
Research on the design and Construction Key Technologies of Giant Cap cofferdam of Gongtie Yangtze River Bridge in Ma'anshan
庾焱秋 1付甦 2邓松涛 1戴也 3徐安祺1
作者信息
- 1. 中交武汉港湾工程设计研究院有限公司,湖北武汉 430040||中交第二航务工程局有限公司,湖北武汉 430040||海工结构新材料及维护加固技术湖北省重点实验室,湖北武汉 430040
- 2. 中交第二航务工程局有限公司,湖北武汉 430040
- 3. 武汉中力岩土工程有限公司,湖北武汉 430071
- 折叠
摘要
Abstract
Ma'anshan Gongtie Yangtze River Bridge is a three-tower steel girder cable-stayed bridge with three main towers.Z5#pier cap is close to the main waterway of the Yangtze River,buried deep in the deep and water-rich sand layer in the heart of the river.The cap volume is 25 717 m3,and the optimization design of the supporting structure is faced with a huge problem.Combined with the bridge site,the steel sheet pile cofferdam is planned to be used as the construction support structure of the cap.After comprehensive consideration of cap structure size,buried depth,geological conditions,hydrological conditions and construction equipment and other factors,the PC engineering pile cofferdam scheme is adopted.The incremental calculation principle is used to analyze the construction process of earth collection in dry work of cofferdam.The empirical calculation shows that the structural strength and stiffness of cofferdam meet the specification requirements.The construction adopts deep well dewatering measures to ensure the anhydrous environment in the cofferdam and ensure the smooth implementation of no bottom sealing scheme.During the construction,the dynamic real-time monitoring is carried out on the structural stress and deformation of the main parts of the cofferdam.Through the comparison and analysis between the monitoring data and the theoretical value,the conclusion is drawn that the incremental method can better reflect the engineering practice and has obvious advantages over the traditional full method.关键词
深埋承台/富水砂层/PC工法桩/围堰/增量法计算/施工监测Key words
deep-buried cap/water-rich sand layer/PC engineering piles/cofferdam/incremental load method/construction monitoring分类
交通工程引用本文复制引用
庾焱秋,付甦,邓松涛,戴也,徐安祺..桥梁巨型承台围堰设计及施工关键技术研究[J].港口航道与近海工程,2024,61(4):111-118,8.
