到 2 0 0 2年 9月 9日为止 ,在海拔 46 5 0ｍ的清水河建设工地上 ,青藏铁路第一长桥———清水河特大桥已完成双柱墩 5 5 9个 ,占设计总量的 43%。青藏铁路格拉段所经过的清水河地区 ,属多年冻土区高温极不稳定区及高温不稳定区 ,在线路设计上采取以桥代路的方式通过。清水河特 As of September 9, 2002, at the Qingshuihe construction site of 465m above sea level, the first Qinghai-Tibet Railway’s Qingshuihe Grand Bridge has completed 559 double column piers, 43% of the volume. The Qingshuihe area, where the Gela section of the Qinghai-Tibet Railway passes, belongs to a very unstable and highly unstable area with high temperature in permafrost regions. The design of the route is taken by way of bridge approach. Qingshui He special