德天铁路跨线大桥的施工测量控制网的案设计毕业论文设计.doc

德天铁路跨线大桥的施工测量控制网的方案设计毕业论文设计 This article mainly aims at the Niagara railway cross line bridge construction, Construction surveying control network design, And verify the feasibility of the. Introduced the characteristics of bridge construction surveying control network, Network principle and method, According to the bridge, Bridge length construction surveying control network precision design, And the application of variance covariance propagation law of design scheme can meet the precision requirement of estimation. According to the precision analysis, Triangulation network triangulation is helpful to control the azimuth error, I.e., Transverse error, And trilateration network facilitates the control of size deviation, I.e. Vertical error, In the establishment of control network in order to make full use of triangulation network and Trilateration Network of these features, Iayout measuring angle and side control network, Whereby the edge corner net. In the layout of corner of the net at the same time, also laying elevation control network for bridge linear control. Linear control of main goal is to make a bridge line to meet the design requirements, Which requires accurate measurement in the process of the construction of each working procedure after the completion of the beam end elevation changes and midline deviation. Key words: Control etwork; Network design; The demonstration of the Programme;Precision Evaluation 目 录摘要 1 1 绪论 1 1.1 施工控制的目的与意义 1 1.2 国内外施工控制技术的发展现状 2 1.5 控制网发展现状 3 1.6 控制网对桥梁建设的实际意义 6 2 德天铁路跨线大桥控制网方案 7 2.1 工程概况 7 2.2 平面控制网 7 2.3 平面控制网精度设计 8 2.4 平面控制网观测方案 10 2.5 高程控制网 10 3 桥梁控制网设计 11 3.1 控制网网形设计原则 11 3.2 桥梁施工控制网 12 3.3 控制网设计方案 13 4 桥梁施工控制网的精度估算 16 4.1 间接平差模型的基础方程和解 16 4.2 最小二乘法原理 17 4.3 精度论证 19 5 总结与展望 25 参考文献 26 致谢 28 1 绪论 1.1 施工控制的目的与意义 德天铁路跨线大桥主桥为45+75+45m预应力混凝土连续梁,其主跨跨度在同类型桥梁中是较大的,具有一定的技术难度。 对高墩大跨径连续刚构桥,从基础施工到通车运营,主要经历了下部施工、主梁悬臂施工、全桥合拢及桥面系施工等环节。尽管按照现有较为成熟的理论和方法可以方便地求出主梁各施工阶段的变形值及预拱度,但结构的实际变形却未必能达