前方交会法在苏通大桥钢护筒中心位置放样与检测中的应用与分析

The Analysis and Application of Forward Intersection Method in Checking and Staking-out the Center of the Steel Protective Canister in the Construction of the Sutong-Yangtze-River-Bridge

结合苏通大桥钢护筒的施工,前方交会法作为有效的放样与检测钢护筒中心位置的方法之一,在钢护筒的施工中得到了较好的应用,在钢护筒中心设计位置一定的情况下,就如何选择加密控制点进行了较详细的分析,并对加密控制点精度的要求、交会图形、如何保证钢护筒中心的精确定位等问题进行了简单的分析,得出了一些有益的结论。

The forward intersection method is an effective method for checking and staking-out the center of the steel protective canister in the construction of the Sutong-Yangtze-River-Bridge, it is used widely in surveying of steel protective canister. The problem about making use of increased control point is discussed in detail. The necessary accuracy of increased control point, the optimum intersection figure and effective measure for precision position of the steel protective canister are discussed too. Some valuable conclusion is drawn in the paper.