高速铁路技术
高速鐵路技術
고속철로기술
HIGH SPEED RAILWAY TECHNOLOGY
2014年
4期
82-88
,共7页
钢桁桥%组合结构%顶推%设施
鋼桁橋%組閤結構%頂推%設施
강항교%조합결구%정추%설시
steel truss bridge%composite structure%thrusting%facility
顶推法常运用于跨越繁忙交通干线的钢桥施工，合理设计的支撑、顶推体系是确保桥梁施工质量及安全性的关键因素。结合双线铁路(114-75+229-5+114-75) m大跨度钢桁梁柔性拱组合结构，该桥小角度斜交上跨高速公路采用顶推施工，提出了综合考虑现场条件、成本等因素的“分段拼装、钢桁梁带拱顶推、柔性拱拱脚合龙冶施工新技术，采用空间管桁架辅助支撑体系、箱型截面滑道梁顶推滑移体系和变截面桁架长导梁结构等合理设计，对超长超高的万t级组合结构安全顶推至设计桥位提供了技术支持。基于有限元程序Midas和SAP2000的多工况检算表明：空间管桁架支架具有强度高、刚度大、稳定性好、安装拆卸方便、可回收利用等诸多优点，并能提供较大安装操作平台；箱型截面滑道梁整体性好、承载力强、变形小；变截面桁架长导梁解决了大吨位、大悬臂状态钢桁梁上墩的技术难题。
頂推法常運用于跨越繁忙交通榦線的鋼橋施工，閤理設計的支撐、頂推體繫是確保橋樑施工質量及安全性的關鍵因素。結閤雙線鐵路(114-75+229-5+114-75) m大跨度鋼桁樑柔性拱組閤結構，該橋小角度斜交上跨高速公路採用頂推施工，提齣瞭綜閤攷慮現場條件、成本等因素的“分段拼裝、鋼桁樑帶拱頂推、柔性拱拱腳閤龍冶施工新技術，採用空間管桁架輔助支撐體繫、箱型截麵滑道樑頂推滑移體繫和變截麵桁架長導樑結構等閤理設計，對超長超高的萬t級組閤結構安全頂推至設計橋位提供瞭技術支持。基于有限元程序Midas和SAP2000的多工況檢算錶明：空間管桁架支架具有彊度高、剛度大、穩定性好、安裝拆卸方便、可迴收利用等諸多優點，併能提供較大安裝操作平檯；箱型截麵滑道樑整體性好、承載力彊、變形小；變截麵桁架長導樑解決瞭大噸位、大懸臂狀態鋼桁樑上墩的技術難題。
정추법상운용우과월번망교통간선적강교시공，합리설계적지탱、정추체계시학보교량시공질량급안전성적관건인소。결합쌍선철로(114-75+229-5+114-75) m대과도강항량유성공조합결구，해교소각도사교상과고속공로채용정추시공，제출료종합고필현장조건、성본등인소적“분단병장、강항량대공정추、유성공공각합룡야시공신기술，채용공간관항가보조지탱체계、상형절면활도량정추활이체계화변절면항가장도량결구등합리설계，대초장초고적만t급조합결구안전정추지설계교위제공료기술지지。기우유한원정서Midas화SAP2000적다공황검산표명：공간관항가지가구유강도고、강도대、은정성호、안장탁사방편、가회수이용등제다우점，병능제공교대안장조작평태；상형절면활도량정체성호、승재력강、변형소；변절면항가장도량해결료대둔위、대현비상태강항량상돈적기술난제。
Thrusting method has been widely applied to the construction of steel bridge overpassing a busy main line, and a reasonable design of supporting and thrusting facilities is the key factor to ensure quality and safety of the bridge con-struction. Using the thrusting project of a double line railway with long-span and steel truss flexible arch composite struc-ture overpassing a high way as a case study and taking into account of the site condition, cost and other factors, the pa-per presents a new technology of “assembly in sections, steel truss girds with arch thrusting and closure at flexible arch foot”. Which employs the supporting system assisted by spatial pipe truss, thrusting slipping system with box cross-sec-tion slide girder and long guiding girder with variable cross-section truss and that provides technical solution from the thrusting to design position of the safety of super-long and ultra high structure. Based on calculation in multiple operating conditions with FEM procedure Midas and SAP2000 , many advantages in the supporting of spatial pipe truss have been showed such as high strength and stiffness, good stability, convenient installation or recycling, and an operation platform attached. Furthermore, the box cross-section sliding girder presentes good integrity, strong bearing capacity and uneasy deformation. With long guiding girder of variable cross-section truss, the position control of long cantilever state in thrusting process could be settled.
