一、引言我国河北、河南、山东等地区,凿井灌溉技术方面,两百年以前就广泛的使用了木管及竹管作滤水管。而我国解放以来水文地质勘探工作中还是采用铁管作滤水管。当水文地质勘探事业迅速发展,开始进行全国综合性水文地质调查后,所需管材增加数量相当庞大,于是产生了管材供不应求的现象,影响勘探试验工作的进行,至五七年农业发展要求勘探钻孔必须结 I. INTRODUCTION In China, Hebei, Henan, Shandong, etc., for well drilling irrigation technology, wood pipes and bamboo pipes were widely used as filter pipes two hundred years ago. The hydrogeological exploration work in China since the liberation of iron pipes used as a filter. After the rapid development of hydrogeological exploration and the commencement of a nationwide comprehensive hydrogeological survey, the increase in the number of pipes required is quite large. As a result, the phenomenon that the supply of pipes is in short supply has affected the conduct of exploration and test work. By the year 1997, the development of agricultural drilling required exploration drilling. Hole must knot