世界跨径最大钢拱桥凤来大溪河特大桥钢桁拱合龙 武隆至两江新区高速公路是重庆高速公路网中"四环二十二射六十联线"的第十六联线，建成通车后，将 串联起仙女山、白马山等旅游资源，助力沿线特色农业及生态旅游产业发展。(完) 来源：中国新闻网 编辑：陈俊明 广告等商务合作，请点击这里 本文为转载内容，授权事宜请联系原著作权人 中新社重庆11月27日电 (记者 郭虹 肖江川)27日，世界跨径最大的钢拱桥——重庆武隆至两江新区高速 公路凤来大溪河特大桥钢桁拱成功合龙。 11月27日，世界跨径最大钢拱桥凤来大溪河特大桥钢桁拱成功合龙。王凯 摄 凤来大溪河特大桥全长1136.7米，主桥采用580米上承式钢箱桁架拱桥设计，为目前世界跨径最大的钢 拱桥。大桥地处武隆区高陡深切峡谷地带，桥面距河面高差超310米，相当于100层楼的高度。大桥采用 全钢结构，总用钢量2.5万吨。 中铁二院工程集团副总工程师、凤来大溪河特大桥总设计师陈克坚在现场告诉记者，设计选用更经济、 更适合深山峡谷地形的钢拱桥施工方案，其受力更加明确、安全性相对可靠、施工相对方便。 据了解，在大桥建设过程中，施工团队攻克了全栓接钢桁拱桥节段应力和线形双控、有限空间桁 ...

Core Viewpoint - The article reflects on the historical significance and engineering challenges of the Qiantang River Bridge, emphasizing its role in Chinese history and the sacrifices made during its construction amid wartime conditions [1][3][36]. Group 1: Historical Context - The Qiantang River Bridge was the first modern bridge in China designed and constructed entirely by Chinese engineers, symbolizing national pride and technological advancement [3][4]. - The bridge was completed in 1937 but was destroyed shortly after its completion to prevent it from being used by invading Japanese forces, highlighting the tragic circumstances of wartime [1][37]. Group 2: Engineering Challenges - The construction faced numerous difficulties, including the unique geological conditions of the Qiantang River, characterized by deep layers of quicksand and strong tidal forces [11][13][26]. - Innovative techniques, such as the "water jet method" for pile driving, were developed to address the challenges posed by the river's conditions, significantly improving construction efficiency [27][28]. Group 3: Financial and Political Aspects - The funding for the bridge was a significant challenge, requiring collaboration between various banks and government entities to secure the necessary capital [16][17][18]. - Political tensions and the involvement of multiple stakeholders, including the Ministry of Railways, complicated the financing and construction process [18][19]. Group 4: Personal Sacrifices and Leadership - The lead engineer, Ma Yisheng, demonstrated exceptional commitment and leadership throughout the project, often working under extreme pressure and facing personal risks [30][32]. - The emotional toll of having to destroy the bridge he had worked so hard to build was profound for Ma, reflecting the deep connection engineers have with their creations [37][38].

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]