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景东兰津桥与永平霁虹桥均是跨澜沧江的古代铁链吊桥,兰津桥相传建于东汉明帝,闻名中外,常被国内外科技史学者引用。现在根据实地调查和多方考证:东汉明帝建的景东兰津桥并不存在:永平霁虹桥,西汉及西汉前原是渡口,至迟三国巳建桥梁,明成化时改建为铁索桥,是我国现存最古的铁索桥。因东汉明帝于永平十二年正式设立了永昌郡,霁虹渡口(兰津渡)或桥梁便成了联接该郡各县的枢纽,所记兰津桥很可能就是霁虹桥。
Jingdong Qunjin Bridge and Yongping Qiao Hongqiao are all spanning the Lancang River’s ancient chain suspension bridge. According to legend, Lanjinqiao was built in the Ming Emperor in the Eastern Han Dynasty, which is famous both at home and abroad. It is often quoted by domestic and foreign scientists and historians of science and technology. Now according to the field investigation and multi-textual research: the Eastern Kingdoms Emperor Qidong Lanjinqiao does not exist: Yongping Huang Hongqiao, the Western Han Dynasty and the Western Han Dynasty before the original ferry, The oldest iron bridge. Due to the establishment of Yongchang County by Ming Emperor Dongdi in Yongping County in the 12th year, the crossing of Yonghong Ferry (Lanjindu) or the bridge became the hub linking all counties in the county. The Lanjinqiao recorded is likely to be Hongqiao.