<正>沪宁高速公路南京东互通立交Ｇ（４）标段，构造物多，线形复杂。为了确保九座跨线桥、一座跨河桥、八座小桥等构造物的准确定位和十五条线路的准确接线，利用ＰＣ－Ｅ５００便携式微机快速实现各种曲线形式的中桩坐标、桥轴线及护桩的坐标计算和利用全站仪采用极坐标法施工放样、检测的放样数据什算。减少了大量的计算工作量，为工程的顺利进行起到了积极的实效，并打破了传统的由曲线主点放样曲线细部的方式。

The G(4) bidding section of the Shanghai-Nanjing freeway interchange in Eastern Nanjingis of many styuctures and complex alignment. The PC-E500 portable computer is used to ensure the accurate orientation of 9 overpass bridges, 1 river-spanning bridge and 8 small bridges and the exact connection between 15 routes. It is applied to the compunction of center-line shake coordinates of differentforms of curves, the coordinate computation of bridge axes and reference stakes, and the staking-outdata processing in constuction lay-out and measurement with total stations by pole coordinate method.With the use of computers, the computation work is greatly reduced. This practice helds the engineering construction, a breakthough from the conventional method of detail lay-out of curves from mainpoints of curves.