横钦高速郁江特大桥实现“毫米级”精准合龙

Core Viewpoint - The successful high-precision closure of the Yujing Bridge, a key project of the Hengqin Expressway, marks a significant advancement in the construction of the Western Land-Sea New Corridor, with minimal axis and elevation deviations of only 3mm and 6mm respectively [1][2]. Group 1: Project Overview - The Yujing Bridge is the first large-span cable-stayed bridge in Guangxi to achieve millimeter-level closure without counterweights, featuring a total length of 980 meters and a main span of 580 meters [1][2]. - The bridge is located in a karst geological area, presenting challenges due to a complex network of caves, with the largest cavity reaching a height of 25.7 meters [1]. Group 2: Construction Techniques - Innovative construction techniques were employed, including segmented drilling and the use of rotary drilling rigs to enhance the success rate of drilling through caves, completing the main bridge pile foundation in just three months [1]. - The longest pile foundation extends to a depth of 65 meters underground, ensuring a solid foundation for the quality engineering of the bridge [1]. Group 3: Economic Impact - Upon completion, the bridge will reduce travel time between the two banks of the Yujing River by 40%, establishing a vital connection between the Beibu Gulf International Port and the interior of Guangxi, thus boosting the region's maritime economy [2].