峡谷地区铁路上承式钢管混凝土拱桥绿色施工技术

Green construction technology of a deck-arch railway bridge with concrete-filled steel-tube ribs in canyon area

以新建浩吉铁路洛河大桥工程为背景,针对桥位处地形险峻陡峭、施工落差大、环保要求严等特点,提出峡谷地区上承式钢管混凝土拱桥全过程绿色施工技术。总体采取无便道施工方案,最大限度地减少对山体和植被的破坏;研发高落差混凝土输送及二次搅拌装置,实现拱座190 m高落差大体积混凝土的快速、连续输送;主拱肋节段采用“1+2”短线法卧拼及“半整体”吊装工艺,节约了预拼场地的面积,提高了施工效率;拱上结构全部采用装配化施工技术,降低了总体能耗,消减了安全风险。洛河大桥的施工,为我国重载铁路桥梁建设积累了宝贵经验。

Taking the Luohe bridge in the new-built Haolebaoji-Ji’an railway segment as engineering background,the construction process of the bridge was discussed in the present study.Due to the steep terrain,steep construction dropping,and strict environmental protection requirement,a green construction technology,mainly including a construction scheme without access roads,a high-drop concrete conveying and secondary stirring device,“1+2”short-line horizontal assembling and“semi-integral”hoisting built process of the main arch,and assemblage construction technology of all of the spandrel structure,was proposed during the construction process.This novel and environmentally friendly technology minimizes the damage to the mountain and vegetation,realizes the rapid and continuous conveyance of large-volume concrete of the skewback with a high drop of 190 m,saves the land area of the pre-assembled site,improves the construction efficiency,brings down the overall energy consumption,and reduces the safety risks.The present green construction technology of Luohe bridge provides valuable experience for the construction of heavy-haul railway bridges in China.