以500 m级钢管混凝土拱桥的设计和成套施工技术为基础，对700 m级钢管混凝土拱桥的设计和建造技术进行可行性研究，确定总体设计和施工方案，较为详细地研究了拱肋制造和安装、管内混凝土灌注等关键技术。研究结果表明，建造700 m级的钢管混凝土拱桥已不存在技术门槛，综合考虑经济、安全等因素，是该跨径级别的强力竞争桥型之一，应尽早进行工程实践和推广。

Based on the design and complete construction techniques of 500m-span concrete filled steel tubular (CFST) arch bridge, a feasibility study on design and construction techniques of 700m-span CFST arch bridge was conducted. The general design and construction schemes were figured out, and key techniques were detailed studied such as manufactory and installation of arch ribs, concrete grouting in tube, etc.. The results showed that there are no technical hurdles to build 700m-span CFST arch bridges. Considering economical efficiency, safety and other factors, CFST arch bridge is a strong competitor when building a 700m-span bridge and should be put on engineering practice and spread as soon as possible.