葡萄牙塔古斯大桥改扩建工程

为应对持续增长的交通量,葡萄牙工程师们从1996年开始,对1966年建成的塔古斯大桥进行了彻底的翻修和扩建,在不中断交通条件下,历时3年,把原先的4车道公路桥变成6车道公铁两用桥,加装了2条主缆,更换了下层桁架,加铺了铁轨,拓宽了公路桥面,并重新命名为4月25日桥。4月25日桥的改扩建措施为今后的桥梁维护改造提供了新思路。

Retrofitting and Widening of Tagus Bridge in Portugal

To cope with the continuing growth of traffic flow,the Portuguese engineers, starting from the year 1996,have implemented thorough retrofitting and widening of the Tagus Bridge in Portugal that was first open to traffic in 1966.It took three years to complete the retro- fitting of the bridge without interruption of traffic and the existing 4-lane roadway bridge was ret- rofitted into a new bridge of 6-lane roadways and railways,on which two main cables were added, the lower deck steel trusses were replaced,the railway tracks were installed,the roadway deck was widened,and the new bridge was again named as the April 25 Bridge.The retrofitting and widening measures taken for the April 25 Bridge provide brand new ideas for the maintenance and retrofitting of bridges of similar kind in the future.