虹桥商务区供能管沟工程的结构设计
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摘要
虹桥商务区核心区一期面积约1.4 km2,供能管沟工程全长3 506 m。管沟结构设计采用内径4.2 m钢顶管或4 m混凝土顶管结合明挖法现浇箱涵方案。采用河道压载措施解决顶管浅覆土过河问题;采用高压旋喷加固保护减小顶管穿越对高架桩基的影响;设计承插式中继间协调钢顶管段与能源站结构间的差异沉降。对顶管井及一般明挖段小尺度基坑采用较规范标准降低基坑安全等级的进行优化设计;对顶管井结构进行三维分析,大直径顶管洞口依据有限元计算结果进行配筋加强;管沟在地块接口处预设临时封堵墙、变形缝及顶板挡土墙以便后续地块衔接。结合相关工程经验及规范要求,确定了管沟结构的保护标准。
The core zone area of the Hongqiao business district is about 1. 4 km2 and the length of energy supply tunnel is 3506 m. Steel jacking pipe with inner diameter of 4. 2 m and concrete jacking pipe with inner diameter of4. 0 m and cast-in-situ concrete box culvert are used in the tunnel structure design. The ballasts are placed on river bed as the jacking pipe is passing through the river with shallow overburden; the jet-grouting piles are designed to protect overpass pile foundation as the jacking pipe is passing; Spigot joint of steel jacking pipe is adopted to adjust the settlement difference between the steel pipe segment and the energy station structure. The excavation pits of pipe jacking work well and normal tunnel section having small scale characteristic and lower safety degrees are used to optimize excavation design; The work well structure is analyzed by 3D modeling and the strengthening bars of large opening are determined by using FEM results; The temporary wall,deformation joint and retaining wall on tunnel roof are prepared for block connecting. Combined with the experience and regulation of related engineering,the standards for the protection of pipe trench structure are determined.
The core zone area of the Hongqiao business district is about 1. 4 km2 and the length of energy supply tunnel is 3506 m. Steel jacking pipe with inner diameter of 4. 2 m and concrete jacking pipe with inner diameter of4. 0 m and cast-in-situ concrete box culvert are used in the tunnel structure design. The ballasts are placed on river bed as the jacking pipe is passing through the river with shallow overburden; the jet-grouting piles are designed to protect overpass pile foundation as the jacking pipe is passing; Spigot joint of steel jacking pipe is adopted to adjust the settlement difference between the steel pipe segment and the energy station structure. The excavation pits of pipe jacking work well and normal tunnel section having small scale characteristic and lower safety degrees are used to optimize excavation design; The work well structure is analyzed by 3D modeling and the strengthening bars of large opening are determined by using FEM results; The temporary wall,deformation joint and retaining wall on tunnel roof are prepared for block connecting. Combined with the experience and regulation of related engineering,the standards for the protection of pipe trench structure are determined.
引文
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[8]王晓伟,童华炜.考虑深基坑坑角效应的支护结构变形计算[J].地下空间与工程学报,2011,7(3):479-484.(Wang Xiaowei,Tong Huawei.Deformation calculation of supporting structure considering deep excavation pit corner[J].Chinese Journal of Underground Space and Engineering,2011,7(3):479-484.(in Chinese))
[9]何宇,曹净,马跃,等.狭长内撑深基坑整体稳定性分析及优化设计[J].工业建筑,2012,42(增):420-423.(He Yu,Cao Jing,Ma Yao,et al.Overall stability analysis and optimization design of narrow long strutted deep excavation[J].Industrial Construction,2012,42(Supp.):420-423.(in Chinese))
[10]杨金华,夏元友,刘毅,等.狭长土岩组合基坑支护结构变形与受力变化规律的现场测试[J].武汉理工大学学报,2012,34(12):78-82.(Yang Jinhua,Xia Yuanyou,Liu Yi,et al.Field test of deformation behavior and stress mechanism for long-narrow type and soilrock composition excavation[J].Journal of Wuhan University of Technology,2012,34(12):78-82.(in Chinese))
[2]中国工程建设标准化协会.给水排水工程顶管技术规程(CECS246:2008)[S].北京:中国计划出版社,2008.(China Engineering Construction Standardization Association.Technical specification for pipe jacking of water supply and sewerage engineering(CECS246:2008)[S].Beijing:China Planning Press,2008.(in Chinese))
[3]魏纲,徐日庆,屠玮.顶管施工引起的土体扰动理论分析及试验研究[J].岩石力学与工程学报,2004,23(3):476-482.(Wei Gang,Xu Riqing,Tu Wei.Testing study and analysis on soil disturbance induced by pipe jacking construction[J].China Journal of Rock Mechanics and Engineering,2004,23(3):476-482.(in Chinese))
[4]黄亮.顶管近距离穿越建(构)筑物及地下管线的保护措施[J].建筑施工,2010,32(4):304-306.(Huang Liang.Protective measures for pipe-jacking closely passing through building(structure)and underground pipeline[J].Building Construction,2010,32(4):304-306.(in Chinese))
[5]彭春强,张毅,范民权.超大直径钢筋混凝土顶管在排水工程中的应用[J].特种结构,2011,28(4):21-24.(Peng Chunqiang,Zhang Yi,Fan Minquan.Application of reinforced concrete pipe jacking with exaggerated size in sewer woks[J].Special Structures,2011,28(4):21-24.(in Chinese))
[6]许龙.大口径钢管长距离曲线顶管原理与设计[J].市政技术,2011,29(2):65-67.(Xu Long.Mechanism and design of long distance curved pipe jacking of large diameter steel pipe[J].Municipal Engineering Technology,2004,23(3):476-482.(in Chinese))
[7]吴绍珍,李玉磊.曲线钢顶管关键技术初探[J].地下空间与工程学报,2011,7(增1):1450-1453.(Wu Shaozhen,Li Yulei.Study on key technology for curved steel jacking pipe[J].Chinese Journal of Underground Space and Engineering,2011,7(Supp.1):1450-1453.(in Chinese))
[8]王晓伟,童华炜.考虑深基坑坑角效应的支护结构变形计算[J].地下空间与工程学报,2011,7(3):479-484.(Wang Xiaowei,Tong Huawei.Deformation calculation of supporting structure considering deep excavation pit corner[J].Chinese Journal of Underground Space and Engineering,2011,7(3):479-484.(in Chinese))
[9]何宇,曹净,马跃,等.狭长内撑深基坑整体稳定性分析及优化设计[J].工业建筑,2012,42(增):420-423.(He Yu,Cao Jing,Ma Yao,et al.Overall stability analysis and optimization design of narrow long strutted deep excavation[J].Industrial Construction,2012,42(Supp.):420-423.(in Chinese))
[10]杨金华,夏元友,刘毅,等.狭长土岩组合基坑支护结构变形与受力变化规律的现场测试[J].武汉理工大学学报,2012,34(12):78-82.(Yang Jinhua,Xia Yuanyou,Liu Yi,et al.Field test of deformation behavior and stress mechanism for long-narrow type and soilrock composition excavation[J].Journal of Wuhan University of Technology,2012,34(12):78-82.(in Chinese))