宣杭铁路复线东苕溪特大桥上部结构施工技术

宣杭铁路复线东苕溪特大桥主桥为跨度112m的下承式尼尔森体系提篮式钢管混凝土系杆拱桥，先拱后梁，在国内为首次设计施工。主拱采用缆索吊机、扣索塔架斜拉扣挂分段悬拼，系梁采用2套挂篮对称现浇施工。介绍该桥上部结构施工技术。

Construction Techniques for Superstructure of Dongtiao Creek Bridge on Xuancheng-Hangzhou Double-Track Railway

The main bridge of Dongtiao Creek Bridge on Xuancheng-Hangzhou Double-Track Railway is a concrete-filled steel tube basket handle through tied arch bridge of Nielsen system with a main span 112 m. The construction of the Bridge proceeded in a way that the arch ribs were erected first and the beam afterwards, and the Bridge is the first of its kind having been designed and constructed in China. In the construction of the superstructure of the Bridge, the cable cranes and cable-stayed suspension and connection method were used for cantilever segmental assembling of the main arch and the concrete of the tie beam was cast in situ symmetrically by two sets of form travelers. In this paper, the construction techniques for the superstructure are presented.