Abstract Two kinds of new reinforce techniques for multiline railway under traffic are in?troduced .The techniques are adopted when big-aperture box-framed under-cross bridge was pushed through multiline railway by use of joist and other light simple member dexterously. The practices have proved that these techniques have many advantages : economical and prac?tical 9 easy to operate,high-cofficient of safety. So, it is worth popularizing.
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Received: 18 April 1997
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