Core Points - The construction of the Hangzhou Bay Cross-Sea Railway Bridge has officially entered the superstructure construction phase with the installation of a 626-ton steel beam [1] - This bridge is a key project for the high-speed railway connecting Nantong in Jiangsu to Ningbo in Zhejiang, with a total length of 29.2 kilometers [1] Group 1 - The steel beam was precisely installed on the No. 8 main pier, marking a significant milestone in the bridge's construction [1] - The bridge serves as a critical infrastructure project aimed at enhancing transportation connectivity between two major cities in China [1]