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为了合理布置钻孔、降低成木，斜孔日益被广泛采用，但目前尚缺乏斜孔铁塔、一般斜孔都使用木三角架，而木三角架对孔深超过300米的钻孔则不便采用。如采用直塔加滑车（导向滑车）的方法，则立根的提引长度就要降低。例采用17.5米高的塔打75°的
In order to reasonably arrange the drill holes and reduce the wood into slats, the slant holes are increasingly widely used. However, there is a lack of slant-hole iron towers at present. Generally, the slant holes use the wood tripod, and the wood tripod is inconvenient to drill holes with a hole depth of more than 300 meters . Such as the use of straight tower plus tackle (guide pulley) method, then the root of the lead length should be reduced. Example using a 17.5-meter tower beat 75 °