Core Points - The completion of the last pair of steel rails at the Shandong University East Road Station marks the full track connection of the Jinan Metro Line 4, laying a solid foundation for the line's opening by the end of this year [1][4] Group 1: Project Overview - The Jinan Metro Line 4 is a major east-west transportation artery in Jinan, with a total length of 40.3 kilometers and 33 stations [3] - The total length of the track laid is 85.074 kilometers, indicating a large-scale construction project [3] Group 2: Challenges and Innovations - The project faced multiple challenges, including long lines, tight schedules, dispersed work areas, frequent handovers, and complex environments [3] - To minimize environmental impact, the project team focused on overcoming technical challenges related to vibration and noise reduction [3] - A significant innovation was the optimization of the traditional cast-in-place spring floating slab track bed to a prefabricated assembly process, which improved construction precision and efficiency while reducing future noise levels by 10 to 14 decibels [3] Group 3: Construction Efforts - During peak construction, seven work fronts were opened simultaneously, utilizing three rail machines and 14 intelligent track-laying devices, with over 400 workers on round-the-clock shifts [3] - The project achieved a record of laying 670 meters of track in a single day through meticulous planning and dynamic optimization [3] - Safety and quality were prioritized throughout the construction process, with strict implementation of detailed control requirements [3][4] Group 4: Progress and Future Steps - The Jinan Metro Line 4 has successfully completed two major milestones: "tunnel completion" and "track completion," setting the stage for subsequent key phases such as electrical testing, joint debugging, and trial operations [4]