【摘要】 探讨了潜孔锤冲击挤密钻进成孔法的产生、钻进机理及其优点，并就该成孔法在锚杆孔施工中所存在的问题，从理论上进行了分析研究，并据此设计了两种结构的挤密钻头。更多还原

【Abstract】 The history, drilling mechanism and advantages of drilling holes with DTH ramming and displacement are discussed. The thoeretical analysis is made based on the problems present with the method in anchor installation and two types of displacing bits have been designed.更多还原