转自：北京日报客户端 那年今日 巍巍钱塘潮，壮哉中华魂。1937年7月7日，"七七事变"爆发。两个多月后的 9月26日，我国第一座完全 由国人自主设计、施工的现代化大桥——钱塘江大桥正式通车。 然而谁也想不到的是，这座大桥在设计之初，便预留了一个放置炸药的长方形空洞，为的就是战争爆发 时能够将大桥彻底炸毁，不给敌人留下使用的余地。 令人痛心的是，预想竟真的成了现实。仅仅竣工89天后，为了防止日军利用大桥运输兵力物资，设计师 茅以升亲手炸毁了这座倾注自己心血的桥梁，"就好比必须亲自捏死自己的儿子一般。" "抗战必胜，此桥必复"，茅以升含泪写下了八个大字。多年以后，虽身不在杭州，但茅以升始终心系钱 塘江大桥。在他的推动下，历经7年修复，1953年9月钱塘江大桥终于全面通车，茅以升当年"不复原桥 不丈夫"的誓言终于变成现实。今天，北京日报客户端通过一篇长文，回顾钱塘江大桥的修建历程，再 现那些悲壮与辉煌同在的历史片段。 杭州钱塘潮头，六和塔前，钱塘江大桥默然伫立了近九十年，宛如长虹横卧。 今天，与它一般横跨钱塘江、担负人们日常通行的桥，杭州境内已有十座。然而，这座年岁最长、起于 战火烽烟之中的大桥，始终是杭州老百姓 ...

Core Points - The successful completion of the Danjiang Xiaosanxia Bridge marks a significant milestone for the Mianxi Expressway project, which connects Henan and Hubei provinces [1][2] - The bridge is the largest span cable-stayed bridge in Henan province, with a main span of 536 meters and a total length of 919 meters [1] - The Mianxi Expressway project is expected to reduce travel time between Xichuan, Henan, and Danjiangkou, Hubei, by over one hour, benefiting approximately three million residents in the area [2] Summary by Sections Project Overview - The Mianxi Expressway spans 24.838 kilometers, designed for a speed of 100 km/h, and features a dual four-lane configuration [1] - The Danjiang Xiaosanxia Bridge is a key control project within this expressway, constructed by China Communications Construction Company [1] Construction Details - The main beam of the bridge is a separated steel box beam, constructed from 35 segments, with a maximum single segment weight of approximately 312 tons [1] - The total steel usage for the bridge approaches 10,000 tons, highlighting the scale of the construction [1] - The construction faced challenges due to environmental factors such as wind and bridge sway, necessitating high precision in monitoring and control during the installation [1] Future Implications - Following the completion of the bridge, the project will transition to the construction of road and bridge ancillary facilities, with an expected completion date in 2025 [2] - The new expressway will create a new transportation corridor for industrial development and the movement of people and goods among the provinces of Shaanxi, Henan, and Hubei [2]