灌河大桥大型深水承台双壁钢吊箱围堰施工技术

灌河大桥主4号墩承台为哑铃形,墩位处水深、潮差大、水流流速快,选用双壁钢围堰进行承台施工。文中对围堰的设计、制作、下水、运输、吊装定位下放等关键技术进行了介绍。通过对钢围堰加工制作质量的控制、关键焊缝的检测、安全运输、整体吊装及定位下放,顺利完成了承台施工。

Construction Technology of Large Double-wall Steel Cofferdam of High Pile Cap in Deep Water of the Guan-he Bridge

The pile cap of the No.4 main pier of the Guan-he bridge is designed in shape of dumbbell structure ,and the pier is in the deep water in which there are large tidal range and fast flow velocity, and the double-wall steel cofferdam for construction of pile caps is taken.In this paper,the design, making,transportation,water cofferdam,lifting and positioning of key technology of decentralization were introduced,and by the steel cofferdam manufacture quality control,the key of weld detection, safe transport,integral lifting and positioning down,the construction of pile cap was successfully completed.