1、摘要 本文主要针对德天铁路跨线大桥的施工，进行施工测量控制网的方案设计，并验证 该方案实施的可行性。 介绍了桥梁施工测量控制网的特点、 布网原则与方法， 根据桥型、 桥长进行施工测量控制网的精度设计，并应用方差-协方差传播定律估算设计方案能否 达到精度要求。根据精度分析,测角网(三角网) 有利于控制方位误差, 即横向误差,而 测边网有利于控制尺寸误差,即纵向误差,在建立控制网时为了充分发挥测角网和测边 网的这些特点, 布设同时测角和测边的控制网, 即边角网。在布设边角网的同时，也布 设高程控制网用于桥梁的线形控制。线形控制的主要目标是使成桥后的线形满足设计要 求，为此需要准确测量施工过程中每一
2、道工序完成后的梁端标高变化和中线偏位。 关键词：施工测量控制网；网形设计；方案论证；精度估算 ABSTRACT 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, N
3、etwork 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, Triangulatio
4、n 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 l
