地质钻探需要大量的岩心管，这些岩心管都用优质钢材，成本很高。我们在土门子土库地质勘探大坝帷幕灌浆施工中，为了解决岩心管消耗量大的问题，组成了由钻探工人和后勤机械加工工人组成的小组，进行了专门研究。发现岩心管都是在接头外径处磨露丝扣而报废的。岩心管壁是4.5毫米，在制作岩心管时要把管壁车掉近一半，只剩下2.5毫米厚。岩心管在工作时外径和孔壁接触，磨损较重；内径跟岩心接触，磨损比较轻。针对这个问 Geological drilling requires a large number of core tubes, these core tubes are made of high quality steel, the cost is high. In order to solve the problem of large core pipe consumption, we formed a team of drilling workers and back-up mechanical workers in the Tumenzi geological exploration dam curtain grouting construction and conducted special studies. Found that the core tube are exposed at the outer diameter of the threaded connector and scrapped. The core wall is 4.5 mm, making it nearly halved when making a core tube, leaving only 2.5 mm thick. Core tube diameter and hole wall contact at work, wear heavier; inner diameter with the core contact, wear and tear lighter. For this question