近几年来,新的工程地质钻机不断出现,但对其配套工具,尤其是对影响钻进效率和成孔质量较大的钻头,在研制改进方面却很少见有介绍。我们在配合研制DTZ-8型动力触探钻机的同时,对钻头的形式和尺寸作了一些对比试验,现作一简略介绍。工民建地基勘察中,对常遇到的粘性土、砂卵 In recent years, new engineering geological drilling rigs have emerged continuously, but their supporting tools, especially drills that affect the drilling efficiency and the quality of the formation of holes, have rarely been introduced in terms of development and improvement. While we were cooperating with the development of the DTZ-8 type dynamic penetration drilling rig, we made some comparative tests on the form and size of the drill bit. We will now give a brief introduction. In the survey of workers’ foundations, there are often encountered clayey and sand eggs.