南京长江三桥钢索塔架设平面控制网的建立

Establishment of The Steel-pylon's Erection Horizontal Control Network of Nanjing Third Yangzi River Bridge

南京长江三桥是我国首座主塔采用钢结构形式的特大型斜拉桥。根据钢索塔拼装测量的精度要求,介绍该桥首级平面控制网的概况,对钢索塔架设专用平面控制网的网形选择、方案设计、观测方法和数据处理进行探讨。实践证明,工程所采取的专用平面控制网布设方法和测量方案是合理的,对类似工程具有借鉴意义。

Nanjing Third Yangzi River Bridge was the first cable-stayed bridge in China,whose main tower was the form steel structure.According to requirement of steel-pylon＇s assembling survey in precision,the head horizontal control network allgemein of this bridge was introduced,and net form selection,conceptual design,observation technique and data processing of special horizontal control network for steel pylon＇s erection were researched.The practice has verified that layout method and surveying conceptual of special horizontal control network were reasonable,which could afford some experience to similar projects.