浅覆软土中钢管幕顶进施工沉降控制技术研究
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摘要
上海市田林路地道新建工程采用管幕-箱涵工法穿越中环线,地道施工具有覆土浅、断面大、周边环境保护要求高等难点。钢管幕在淤泥质软土中穿越高等级道路,顶进施工时沉降变形控制是极为重要的一环。结合内锁扣形式的管幕钢管设计,从管幕掘进机刀盘与泥土舱设计、顶进纠偏系统、洞口止水装置、触变泥浆系统及管幕施工顺序等多个方面,详细阐述管幕钢管顶进过程中沉降控制施工技术措施。施工监测结果表明,中环线路面变形均控制在±2cm内,沉降控制作用明显。钢管幕群顺利穿越中环线,为后续箱涵推进创造有利条件。
The proposed Tianlin Road tunnel crosses the Mid-ring Road( city expressway) in Shanghai.The tunnel construction has many features and difficulties,include shallow covering,large section,high protection requirements for surrounding environment,and so on. It is intend to use pipe roof-box culvert method as the steel pipe roof is jacking across high grade road in the soft clay, the subsidence deformation control is an important part of this method. Based on the pipe design of inner-lock,the settlement control technology in the process of pipe roof jacking is elaborated. It contains the designs of cutter and soil warehouses for heading machine,deviation rectify system,sealing device,thixotropic mud system and jacking sequence of steel pipes. The monitoring results show that the deformation of Mid-ring Road surface are controlled within the allowable range as ± 2 cm. The successful passage of pipe roof underneath the Mid-ring Road has laid favorable foundation for subsequent culvert advancing.
The proposed Tianlin Road tunnel crosses the Mid-ring Road( city expressway) in Shanghai.The tunnel construction has many features and difficulties,include shallow covering,large section,high protection requirements for surrounding environment,and so on. It is intend to use pipe roof-box culvert method as the steel pipe roof is jacking across high grade road in the soft clay, the subsidence deformation control is an important part of this method. Based on the pipe design of inner-lock,the settlement control technology in the process of pipe roof jacking is elaborated. It contains the designs of cutter and soil warehouses for heading machine,deviation rectify system,sealing device,thixotropic mud system and jacking sequence of steel pipes. The monitoring results show that the deformation of Mid-ring Road surface are controlled within the allowable range as ± 2 cm. The successful passage of pipe roof underneath the Mid-ring Road has laid favorable foundation for subsequent culvert advancing.
引文
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[2]朱合华,闫治国,李向阳,等.饱和软土地层中管幕法隧道施工风险分析[J].岩石力学与工程学报,2005,24(2):5549-5554.
[3]朱侃唯.管幕箱涵法地下通道顶进施工地表沉降分析[J].四川建材,2015,41(2):149-150.
[4]曹书文,陈平,赵冬,等.顶管施工引起古建筑地表沉降分析[J].建筑科学,2011,27(5):96-98.
[5]周松,陈立生.地下穿越施工技术[M].北京:中国建筑工业出版社,2016.
[6]邱跃然,李晓明.顶管过程中触变泥浆减阻的原理及应用[J].市政技术,2012,30(S1):82-84.
[7]李积栋,油新华.支护-结构一体化管幕预筑法地铁车站优化分析[J].施工技术,2018,47(13):89-93.
[8]陶连金,张倍,边金,等.砂卵石地层管幕施工试验研究[J].施工技术,2018,47(7):124-127,156.