Core Insights - The completion of the 20th main pier foundation pouring for the Fuchimen dual-use bridge marks a significant milestone in the construction of the Ningbo-Zhoushan Railway, which is a major project in China's medium- and long-term railway network plan [1][2] Group 1: Project Overview - The Ningbo-Zhoushan Railway spans 76.4 kilometers, connecting Ningbo East Station to Baichuan Town in Dinghai District, and will end the historical lack of railway access in the Zhoushan archipelago [1] - The Fuchimen dual-use bridge, a key control project of the railway, is 1,726 meters long and features a "road-rail flat layer" design, with a railway in the middle and roads on both sides [1] Group 2: Engineering Features - The bridge boasts two world records: the main span of 388 meters is the largest for a high-low tower dual-use bridge, and it features the widest cantilever steel box girder bridge [2] - The bridge employs a unique design with a bridge tower penetrating the cantilever steel box girder, a global first [2] Group 3: Construction Details - The 20th main pier foundation was poured in two stages, with the first stage at 2.25 meters and the second at 4.25 meters, using approximately 4,300 cubic meters of concrete [2] - A smart temperature control system was implemented to monitor and adjust the temperature of the large volume of concrete, ensuring quality control during the pouring process [2]