目前,排除鑽桿折断事故所使用的雄錐和雌锥往往不能起到很好的效果,尤其在被折断的鑽桿尖端不整齐的情况下。本文所介紹的工具曾在地質勘探队进行过实际試驗,并且取得了良好的效果。同时,此种工具构造简單,在任何野外勘探队里都可以制作。这种工具是用直徑73公厘或89公厘的岩心管制成的。制作方法是将岩心管中间部份內徑分别压缩到46或54公厘,使其除能通过42或s0公厘的鑽桿外, At present, male and female cones, which are used to rule out breakage of a drill pipe, often do not work well, especially if the broken drill pipe tip is not well-aligned. The tools described in this article have been actually tested in geological prospecting teams and have yielded good results. At the same time, this tool is simple to construct and can be made in any field exploration team. This tool is made of core tubes 73 mm or 89 mm in diameter. The production method is to compress the core diameter of the middle part of the core pipe to 46 or 54 mm, respectively, so that it can pass through the drill pipe of 42 mm or 0 mm,