铁道标准设计2018，Vol.62Issue(6)：104-109,6.DOI:10.13238/j.issn.1004-2954.201707070001
地铁隧道下穿异型连续梁桩基托换设计
Design of Pile Foundation Underpinning for Metro Tunnels Under-passing Irregular Continuous Beam
摘要
Abstract
As the double track tunnel of the intercity rail from Xi'an North Railway Station to the airport passes under the main bridge,eight piles of 22-1 and 22-2 bridge piers have to be removed.The existing upper structure is irregular continuous beam.To insure that the traffic of the existing bridge is not interrupted,active pile underpinning is adopted.The underpinning force is approaching 30 000 kN,meanwhile,the span of the underpinning beam is close to 20 meters,which make the project complex and difficult to design and construct.By analyzing the ambient control factors,the paper introduces relevant designs and main controlling measures,including design of underpinning beam,control value of main monitoring projects and main construction procedures.At present,the project is completed and the whole process is in line with the design expectation.Practice shows that the underpinning process design is rational and the structure is reliable.关键词
地铁/主动托换/托换梁/桩基/异型梁/桥墩Key words
Metro/Active underpinning/Underpinning beam/Pile/Irregular beam/Bridge pier分类
交通工程引用本文复制引用
杨正华..地铁隧道下穿异型连续梁桩基托换设计[J].铁道标准设计,2018,62(6):104-109,6.基金项目
中铁第一勘察设计院集团有限公司科研项目(院科13-14) （院科13-14）
