Core Viewpoint - Recent significant progress has been made in the construction of multiple subway lines in Qingdao, including lines 5, 7, 9, and 15, which lays a solid foundation for subsequent engineering advancements [1] Group 1: Subway Line 5 - The main structure of the Metro Line 5 Dasha Station was completed 10 days ahead of schedule with the final concrete pouring on August 10, facilitating subsequent construction of auxiliary structures and shield machine reception [1] Group 2: Subway Line 7 - The construction of Line 7 achieved dual milestones with the "Xin.He" shield machine's cutter head breaking ground, successfully completing the left line tunnel from Beinan Station to Yingpu Road Station, and the right line shield machine entering the steel sleeve, marking dual line completion in the section from Wenfeng Road Station to Lan'ao Road Station [1] Group 3: Subway Line 9 - The shield section from Yuhuangling Station to Xijing Station (referred to as "Yuxi Section") successfully achieved dual line completion on August 18, marking a breakthrough in the first phase of Line 9 construction and yielding multiple technical achievements in full-section hard rock excavation, green energy segment application, and underground tunnel construction [1] Group 4: Subway Line 15 - The right line shield machine of the Dan Mountain Station to Yuxia Road Station section (referred to as "Dan-Yu Section") successfully broke through, marking dual line completion and laying the groundwork for subsequent track laying and electromechanical installation work [1]

Core Points - Qingdao Metro has made significant progress in the construction of multiple lines, including the completion of key milestones such as section connectivity and station topping out, laying a solid foundation for future operations [1][3][5][6] Group 1: Line Developments - The second phase of Line 2 has successfully passed acceptance for the Longchuan Road Station's auxiliary entrance, marking a critical step towards its operational readiness [3] - The construction of Line 5 has advanced with the successful completion of the right line shield tunneling between Ditie Dasha Station and Chuzhou Road Station on July 15 [3] - Line 6's second phase achieved a major milestone with the topping out of the main structure at Chaoyang Mountain Road Station on July 13, becoming the first underground station to reach this stage [3] Group 2: Multiple Line Progress - Line 9 is experiencing rapid progress, with Xijing Station achieving both the topping out of its main structure and the completion of the A entrance underground passage within a month [5] - The right line tunnel between Huicheng Road Station and Yuhuangling Station has been successfully completed using TBM tunneling [5] - The shield machine for the section between Chengzi Station and Huacheng Road Station has also successfully completed its tunneling operations [5] Group 3: Additional Line Achievements - The shield tunneling for the section between Huacheng Road Station and Zhengyang Middle Road Station has commenced with the "Municipal Iron Army No. 11" shield machine [6] - The TBM left line tunneling between Tianshan First Road Station and Tianshan Second Road Station on Line 15 has successfully achieved dual line connectivity [6] - The main structure of Gouchai Station, including the 3rd and 4th ventilation shafts, has been completed on schedule, facilitating further project advancement [6]

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].