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
flat double-girder bridge decks 扁平双边肋主梁
double girder truss gantry crane 双桁架梁龙门起重机
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。
The main hull girder to consist of upper deck, topside tanks, hopper tanks and double bottom.
主船体梁由上甲板，顶边舱，斜边舱和双层底组成。
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