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在竖井钻进中,超前孔的直度决定着竖井的直度。美国华盛顿州东北共和矿开凿一口深400米的新辅助与通风井,其超前孔直径为38Q毫米,竖井的校准是B.J.勘探公司要考虑的主要问题。根据合同要求,竖井的最终扩孔直径为2.1米,整个竖井要求能使用直径1.8米对
In shaft drilling, the straightness of the leading hole determines the straightness of the shaft. The NEA mine in northeastern Washington, US, dug a new 400m deep auxiliary and draft shaft with an advance hole diameter of 38Q millimeters and the shaft alignment was a major issue to be considered by the B.J. Exploration Company. According to the contract, the final shaft reaming diameter of 2.1 meters, the shaft requires the use of 1.8 meters in diameter