12月27日10时15分，济南地铁4、8号线和6号线东段将开通运营。"三条线路总计里程约85.1公里，车站64座，加上已经运营的1、2、3号线及济南云巴和 年底将开通的济阳线，届时济南多制式轨道交通线网规模将达到248公里，大幅提升济南轨道交通的影响力。"济南轨道交通集团规划技术中心技术管理部 副部长胡冰冰接受记者采访时表示。 其中，4号线全长40.3公里，设站33座，是济南市当前线路最长、设站最多、客流密度最大的线路。这条线路串联历下、高新、历城等5个行政区，是贯穿 主城区的骨干线路，将对城区客流集散发挥重要作用。 济南轨道交通集团建设投资公司4号线项目管理部经理曹殿彬说："4号线工程建设的特点可以概括为保泉优先、环境复杂、要求极致。我们通过绕避抬升 等措施，实现了工程建设与泉水保护的共荣共生；面对富水、硬岩、岩溶、断裂带、采空区等地质条件及城区管线密集的周边环境，我们采取超前地质预 报、定制盾构设备、创新工艺工法等措施确保了工程建设的安全；建设标准与协调难度大，我们与沿线单位协同攻坚，实现工程安全、生态安全、社会影 响的多重平衡。" 该项目在建设中创造了多个全国第一，全国首座全范围应用"永临一体"和"预制 ...

Core Points - The Beijing Infrastructure Investment Company has released the full environmental impact report for the connection line project between the Yizhuang Line and Lines 5 and 10, which is set to begin construction by the end of 2025 [2][3] - The project aims to directly connect the Yizhuang Line with Line 5 and facilitate same-platform transfers with Line 10, significantly improving transit efficiency and service levels [2][3] - The construction will cover approximately 2.7 kilometers, with 2.2 kilometers being newly constructed underground lines, and is expected to alleviate congestion at Songjiazhuang Station, which currently handles the highest transfer volume in the network [2][3] Project Details - The connection line will start from Xiaocun Station in Chaoyang District and end at Songjiazhuang Station in Fengtai District, with no new or expanded stations planned [2] - The project will utilize shield tunneling, open-cut, and underground excavation methods, avoiding blasting operations [2] - The implementation of this project is part of the third phase of Beijing's urban rail transit construction plan, which aims to enhance connectivity for the Yizhuang New Town with the central urban area [3] Expected Benefits - The project is projected to reduce the transfer passenger flow at Songjiazhuang Station by approximately 10,000 during peak hours, benefiting over 170,000 passengers daily, which accounts for about 88% of the average daily transfer volume [3] - The estimated changes include 71,000 passengers no longer needing to transfer, 36,000 passengers switching to same-platform transfers, and 65,000 passengers adjusting their transfer platforms, thus shortening transfer distances by about 150 meters and 100 meters respectively [3] - The completion of the project is anticipated by December 2028, pending official announcements from relevant government departments [3]