一、工程概况亚洲跨度最大的上承式钢管拱桥郑州铁路黄河特大桥主拱在2011年底成功合龙,标志着该桥钢管拱合龙、拱肋拱混凝土顶升,拱上墩柱π型梁三个施工阶段中,取得了第一阶段性突破。该桥属于重大、高新、尖端、复杂、难工程项目,采用跨度 First, the project profile on the span of China’s largest span steel tube arch bridge Zhengzhou Railway Huanghe Super Major Bridge at the end of 2011 the success of the dragon, marking the bridge arch steel arch, arch rib arch concrete rise, pigeon pier arch beam three During the construction phase, the first-stage breakthrough was achieved. The bridge is a major, high-tech, sophisticated, complex and difficult projects, the use of span