自降螺旋千斤顶的螺纹无自锁作用，装有制动器。
From falls screw jack's thread non-self-locking action, is loaded with the brake.
普通螺旋千斤顶靠螺纹自锁作用支持重物，构造简单，但传动效率低，返程慢。
The ordinary screw jack depending on the thread self-locking action support heavy item, the structure is simple, but the transmission efficiency is low, the return trip is slow.
本文是对自锁锚杆在拉伸和剪切荷载共同作用下的锚固机理进行研究。
The anchorage mechanism of the locking anchor under tension together shear loads is studied in the paper.
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