double girder bridge [机] 双梁桥架
double girder crane 双梁起重机
double girder gantry crane [机] 双梁门式起重机 ; 双主梁门式起重机桁架式
Single and double girder crane 单双梁起重机
Single and double girder cranes 单双梁起重机
double girder system 双层交叉梁系
double-girder-truss crane 双梁桁架门式起重机
Double girder overhead crane [机] 双梁桥式起重机
flat double-girder bridge decks 扁平双边肋主梁
The structure of shipbuilding gantry crane has single and double girder types.
造船龙门起重机结构型式分为单梁和双梁。
As a new installation method for big structures, double girder integral lift is mainly composed of fixed girder, moveable girder, work anchor, moveable anchor, jacks and guide rail.
双梁式整体提升法是一种新型的大型结构安装方法，主要由固定梁、活动梁、钢绞线、工作锚、工具锚、导向装置及千斤顶组成，与现在常用的安装方法相比，具有价廉、安全、高效和易推广等特点。
A new technique is put forward that high-low brace gantry crane wide double guiding girder method to construct bridge.
本文提出了高低支腿龙门吊宽幅双导梁法这种新的桥梁工程施工方法。
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