三角变截面轻型桁架导梁设计与顶推施工关键技术

Key Technology of Design and Incremental Launching Construction of Triangular Variable Section Light Truss Guide Beam

结合温州七都北汊桥引桥钢箱梁导梁施工项目,对多跨钢箱梁三角变截面桁架轻型导梁的设计、临时支架与顶推支座的布置、各工况安全分析、预抛高设置等内容进行了总结和研究。通过采取有效的控制措施,确保了钢箱梁三角桁架轻型导梁的安全施工,可为今后类似工程提供借鉴。

Combined with the construction project of steel box girder guide beam of approach bridge of Qidu Beicha bridge in Wenzhou,the design of light guide beam with triangular variable cross-section truss of multi span steel box girder,the layout of temporary support and pushing support,safety analysis of various working conditions and setting of pre throwing height are summarized and studied.By taking effective control measures,the safe construction of the steel box girder triangular truss light guide beam is ensured,which can provide reference for similar projects in the future.