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。
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。
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