箱梁
箱梁（英文：Box girder、Tubular girder），又稱箱型樑，是桥梁工程中的一种建築構件，内部呈空心状，上部两侧有翼缘，形狀似箱子，因此而得名。分有单箱及多箱等種類。
Section of the original tubular Britannia Bridge
The patent curved and tapered box girder jib of a Fairbairn steam crane
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