三峡水利枢纽右岸三期工程预应力门机大梁施工工艺

Construction technology of psestressed gantry crane girder for the third stage works of Three Gorges project

三峡水利枢纽右岸三期工程坝顶预应力门机大梁高度大、跨度长、钢筋密集、结构体型复杂、张拉吨位大、张拉要求高。针对门机大梁以上特点,对梁体模板设计、混凝土浇筑振捣、梁体张拉施工技术难点进行了深入研究。

The prestressed gantry crane girder, located on dam crest of right bank in the third stage works of Three Gorges project, is high, long span and complicated in structure, with close spaced reinforcement and large tensioning tonnage. As to the above characteristics of the gantry crane, the further study has been made for formwork design, concreting and vibrating and girder in tension.