shaft sinking

基本解释

In a word, a reasonable freezing arrangement is the key point for safty, fast, economy in shaft sinking by freezing.
总之，合理的冻结孔布置是确保冻结法凿井施工安全、快速、经济的关键所在。
This paper analyses the piston effect problem in dellling shaft sinking method and its detriments. In the meantime, the approaches of solving the problem are proposed by the author.
本文分析了钻井法凿井中所出现的钻井活塞效应问题及带来的危害．提出了解决钻井活塞效应的方向和途径。
In shaft construction, many sinking hoists were used to hang or bring to the stretch equipment like Hang dish, and template.
立井施工期间，采用多台凿井绞车同时悬吊或张紧一个设备，如：吊盘、模板等。

Hecla has also begun preparatory work for sinking of No. 4 Shaft, which is planned to access extensions to reserves, resources and additional exploration targets.
FORBES: Update:Hecla Plans To Reopen Lucky Friday Mine In 1Q; Loss Reported In 3Q