derrick man

基本解釋

The driller and the derrick man must remain in constant radio contact.
司鑽和井架工必須用對講機(jī)一直保持聯(lián)系。
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The derrick man, positioned at the crown block, is to advise the driller when the snake is coming through the crown sheave.
井架工看守在天車上，儅蛇皮接繩器到達(dá)天車時，通知司鑽。
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The air hoist may be used to hoist a workman (other than derrick-man) when a bosom chair with safety belt or derrick climbing belt is used to hoist the workman.
可以使用配了安全帶或助爬帶的工作吊椅進(jìn)行高空作業(yè)。