杭州湾跨海铁路大桥首座主塔封顶

Group 1 - The Hangzhou Bay Cross-Sea Railway Bridge, the longest cross-sea railway bridge in the world, has reached a significant milestone with the successful topping of the main tower No. 8, which stands at 200 meters high [1] - The bridge is a key project of the Tongzhou-Ningbo High-Speed Railway, spanning 29.2 kilometers and featuring a dual-line ballastless track design for speeds of up to 350 km/h [1] - The bridge consists of three navigation bridges and a total of 26 kilometers of sea and shallow water approach bridges, with the northern navigation bridge being the largest span ballastless cable-stayed bridge under construction globally, measuring 932.7 meters in length and a main span of 450 meters [1] Group 2 - The main pier of the northern navigation bridge utilizes 52 piles with a diameter of 2.5 meters and a maximum depth of 150 meters, designed to penetrate complex seabed layers and ensure structural safety [2] - Innovative construction techniques, such as the "large double-wall steel caisson with full load and high-precision synchronous control," have been employed to create a stable working platform at sea [2] - The main tower is composed of multiple sections with high precision requirements, and the anchorage area for the stay cables employs a combination of steel anchor beams and steel brackets, requiring precise integration at significant heights [2]