金属构件防腐新技术在桥梁养护工作中的应用

桥梁金属构件养护特别是防腐处理是桥梁养护的重点和难点。结合江苏省淮安市国省干线公路桥梁金属构件近年来的成功养护实践，介绍喷砂除锈和热喷锌防腐新技术的施工工艺、质量要求与控制要点。

Force Research on Steel Stiffening Truss Girder of Mountainous Long-span Suspension Bridge

Due to the big vertical stiffness,good ventilation performance of truss stiffening girder,it is used in large-span suspension bridge,but the erection technology of the stiffening girder of mountain extra large span suspension bridge has been one of the factors in the development of its application. Deck erection gantry method has the advantages of less aerial operational work,short construction pe-riod and is widely used in stiffening girder erection of suspension bridges in mountainous area.In or-der to ensure safety,taking the construction installation of steel truss stiffening girder of mountains large span suspension bridge as the background,the finite element model of a cable crane steel truss is established,and the strength,stiffness and stability research on the force of the steel truss are ana-lyzed.The results show that under the most unfavorable load condition the strength of across steel truss meets the requirements of the cable crane,the maximum stress is 1 5 7 MPa,the stability of steel truss satisfies the requirement,and the first order buckling coefficient is 12.1.