紧邻在建城市轨道交通特别保护区开口基坑支护实践  

Practice of retaining and protection for unclosed excavations adjacent to urban rail transit special reserve under construction

作　　者：吴亮 Wu Liang(Wuxi Architectural Design and Research Institute Co.,Ltd.,Wuxi Jiangsu 214001,China)

机构地区：[1]无锡市建筑设计研究院有限责任公司,江苏无锡214001

出　　处：《山西建筑》2025年第2期77-81,共5页Shanxi Architecture

摘　　要：基坑北侧距离济南市在建城市轨道交通R2线特别保护区仅1.9 m,特别保护区内严禁支护结构进入,务必在该有限的空间内实现支护桩和止水桩的布置,因此济南市常规的桩锚支护体系难以应用。基坑南侧为先开挖到底的居住地块基坑,因其邻近本基坑侧采用放坡支护,导致本基坑在南侧形成开口,难以满足支撑支点设置要求。通过在居住地块侧设置专门的支撑传力结构作为支座,在解决支撑支点设置问题的同时还增加了地下室的实际使用面积,使本基坑成为R2线特别保护区边首个采用钢管支撑的地下2层深基坑,在确保基坑本身安全的同时,满足了R2线的建设控制要求。The north side of the excavation is only 1.9 m away from the special protection zone of urban rail transit R2 line under construction in Jinan.The support structure is strictly forbidden to enter the special protection zone.The layout of support piles and water stop piles must be realized in this limited space.Therefore,the conventional pile anchor support system in Jinan is difficult to apply.The south side of the excavation is the residential plot excavation excavated to the bottom first.Because the slope support is adopted near the side of the excavation,the opening of the excavation is formed in the south side,which is difficult to meet the requirements of supporting fulcrum setting.By setting a special supporting force transfer structure as a support at the side of the residential plot,the problem of supporting fulcrum setting is solved,and the actual use area of the basement is increased,making this excavation the first two-story deep excavation supported by steel pipes at the side of the special protection zone of line R2.While ensuring the safety of the excavation itself,it meets the construction control requirements of line R2.

关 键 词：城市轨道交通 特别保护区 基坑支护 钢管支撑 支撑传力结构 

分 类 号：TU473[建筑科学—结构工程]