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N a lifting device utilizing the mechanical advantage of a screw thread, the effort being applied through a bevel drive 千斤顶 (Also called jackscrew, jack)
In connection with an engineering example, this paper introduces the application of a novel active roof-propping technique which uses umbrella-shaped braces and screw jacks for active propping.
在该工程中采用了新颖的伞型斜向支撑技术，并利用螺旋式千斤顶进行主动支顶。
The structure composition method of operation and the feature of the hydraulic climbing scaffolds is described, which are lifted by hydraulic screw jacks with load.
介绍利用穿心式带载升降液压千斤顶做提升动力的液压爬架的结构构造、操作方法及其特点。
Screw jacks are put on the seat pads and adjusted to the same height using a leveling instrument. Then the screw jacks shall be fixed tightly and their positions recorded.
按图纸标高，用水准仪校准到统一高度，按位置记录并收紧螺纹千斤顶。
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