明尼苏达大桥的垮塌让美国人记忆深刻，然而放眼整个国家，又有多少老久的桥梁该让人们足够注意呢？
And we all remember the Minneapolis bridge collapse, but up to a quarter of all the bridges in the country are in need of attention.
有些老混凝土工程或新建混凝土工程出现施工缺陷，客观条件下不允许按常规方法修补，如公路路面、桥梁、隧道等。
It is not allowed to repair by normal ways when construction defects happened to some old concrete engineering or new-built ones, eg pavement, bridge, tunnel, etc.
该软件主要用于新、老桥的极限承载能力分析以及桥梁现状的识别鉴定。
Software is studied and programed for analyzing the ultimate bearing capacity of the new and old bridge, and appraising the existing bridge.
通过对南城桥二次拓宽改造的方案优化过程、主要技术措施及改建成效等方面的阐述，探讨中小桥梁老桥改建技术。
In this paper description is given to the optimization of the 2 nd widening and improving scheme of the Nancheng Bridge, as well as the main facilities and their effects.
通过对南城桥二次拓宽改造的方案优化过程、主要技术措施及改建成效等方面的阐述，探讨中小桥梁老桥改建技术。
In this paper description is given to the optimization of the 2 nd widening and improving scheme of the Nancheng Bridge, as well as the main facilities and their effects.
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