椒江特大桥主桥建造关键技术

Key Technologies for Main Bridge Construction of Jiaojiang River Super Major Bridge

椒江特大桥主桥为设计速度250 km/h、预留速度300 km/h的4线高速铁路双塔双索面钢桁梁斜拉桥,是杭绍台铁路项目的控制性工程、是采用双主桁钢桁梁结构的大跨度高铁斜拉桥。桥位处分布深厚海积相淤泥土层,施工期受强潮汐及台风影响,特殊环境条件给桥梁建造增加了难度,对施工技术提出了更高要求。通过对超深钻孔桩基础、大体量双壁钢套箱围堰结构、桥塔施工工艺、钢梁架设方法进行研究,安全、优质、高效地完成椒江特大桥主桥建造任务。椒江特大桥主桥建造规模大、施工条件差、技术难度高,该桥建造关键技术可为沿海地区同类桥梁结构施工提供参考。

The main bridge of the Jiaojiang River Super Major Bridge is a four-track high-speed railway steel truss girder cable-stayed bridge with two towers and two cable planes,with a design speed of 250 km/h and a reserved length of 300 km.It is critical work of the Hangzhou-Shaoxing-Taizhou HSR Project and a large-span high-speed railway cable-stayed bridge with a double main steel truss girder structure.The bridge site is distributed with a deep marine silt layer.Such special environmental conditions as strong tides and typhoons make it more difficult in terms of bridge construction,thus making higher construction technology much in need.Through the study of ultra-deep bored pile foundation,large-scale double-wall steel case box cofferdam structure,bridge tower construction technology,and steel beam erection method,the construction of the main bridge of Jiaojiang River Super Major Bridge is completed safely,with high-quality and high efficiency.With the characteristics of large scale,poor conditions,and high level of technical difficulty in terms of the construction of the main bridge of the Jiaojiang River Super Major Bridge,to which the key technologies applied can provide a reference for the construction of other similar bridge structures along the coastal region.