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在大型公路桥梁的变形观测中,挠度变形观测是一项主要的内容,而对于大跨度预应力混凝土悬臂梁桥而言,徐变挠度的观测具有突出的地位。本文从挠度变形的规律出发,分析了观测精度要求,确立了合理的精度与观测周期之间的内在联系。通过对我国几座同类型大桥,特别是对重庆长江大桥多次挠度观测资料的分析,在满足设计要求的前提下,对大桥挠度观测的技术要求、观测点的布置、水准路线的设计导,进行了初步的探讨。为了满足观测时只能局部停车的条件,对选择观测时机和观测方法作了一定的研究。最后对观测资料的整理提出了初浅的看法。
In the deformation observation of large-scale highway bridges, deflection deformation observation is a major content, while for large-span prestressed concrete cantilever beam bridge, the observation of creep deflection has a prominent position. Based on the law of deflection deformation, this paper analyzes the requirements of observation accuracy and establishes the intrinsic relationship between reasonable accuracy and observation period. Based on the analysis of multiple deflection observation data of several bridges of the same type in our country, especially for Chongqing Yangtze River Bridge, the technical requirements of deflection observation of bridge, the arrangement of observation points, the design guide of leveling route, Conducted a preliminary discussion. In order to satisfy the condition of only partial parking when observing, we made some researches on choosing the timing and method of observation. At last, it puts forward a shallow view on how to organize the observation data.