青岛地铁建设加速跑！2、5、7、15号线传来多项关键进展

Core Viewpoint - The Qingdao Metro construction is making significant progress with multiple key milestones achieved across various lines, enhancing the city's rail transit network efficiency and connectivity. Group 1: Line 2 - The second phase of Line 2 has successfully completed the structural topping of the East Chuan Road Station, which connects the eastern urban area with Laoshan, improving transit coverage in the region [2]. Group 2: Line 5 - The main structure of the Funing Interchange Station on Line 5 has been successfully poured, and the "Haihu" section has achieved double-line completion 15 days ahead of schedule, overcoming complex geological conditions [3]. Group 3: Line 7 - The assembly of the first prefabricated track top wind duct in Qingdao Metro has been completed, significantly reducing construction time and minimizing on-site dust and noise [4]. Group 4: Line 15 - Line 15 has made critical advancements with the completion of the main structure at the Jingcheng Road Station and the successful tunneling of the "Xiafu" section, enhancing connectivity between key urban areas [5]. - Currently, the total length of the under-construction lines exceeds 100 kilometers, with over 20 key milestones achieved this year [5].