青岛地铁建设再传捷报，5、7、9、15号线关键节点有突破

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]