Wuhan Yingwuzhou Yangtze River Bridge located in the city center of Wuhan. It is about 2.3 kilometers to the upper reaches of Wuhan Yangtze River Bridge and it is an important part of the planning of the new link. Its construction site is affected by topography, climate conditions, and its bridge across Yangtze River. All of these make the traditional leveling and opposite trigonometric leveling become infeasible in the steel tower construction and benchmark cable adjustment. In order to solve this problem, this paper presents a new method of baseline cable alignment based on unidirectional trigonometric leveling. It is a good way to solve the standard cable strand one-way trigonometric leveling, the precision measurement of sidespan and midspan spans and high-precision second-class measurement of the rivers and valleys and other a series of problems to provide powerful guarantee for the smooth progress of the construction.%武汉鹦鹉洲长江大桥地处市区中心,位于武汉长江大桥上游约2.3公里处,是规划的新内环线重要组成部分.其施工现场受地形、气候条件影响较大,桥梁横跨长江两岸,这使得在钢塔施工和基准索调索测量工作中,传统的精密水准测量和对向三角高程测量都变得不可行.为了解决这个难题,本文提出了一种基于单向三角高程测量的基准索线形测量新方法,它很好地解决了基准索股单向三角高程测量、边跨中跨跨度精密测量以及跨越江河峡谷的高精度二等水准测量等一系列难题,为施工的顺利进行提供了有力的保证.
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