A New Method Of Landslide Reconnoitering

Nowadays, there are such technical problems as drilling poor hole, low efficiency in drilling etc. in landslide reconnoitering work, which influence seriously landslide reconnoitering and landslide prevention and cure. Down-the-Hole (DTH) hammer drilling has already been applied in many areas as an efficient drill method. The thesis is to explore a new method of landslide reconnoitering—simultaneous casing & coring method by pneumatic DTH hammer drilling.The method adopts pneumatic DTH hammer drilling principle, combines simultaneous casing method by pneumatic DTH hammer drilling with coring, gives free rein to technical superiority of the former in fast drilling and simultaneous casing good protection for wall and the latter in high capacity gathering core through optimizing design and forms a new drill method for landslide reconnoitering—simultaneous casing & coring method by pneumatic DTH hammer drilling. The thesis introduces the structure ofΦ168 simultaneous casing & coring method by pneumatic DTH hammer driller, the principle of simultaneous casing & coring drilling, the feature of driller, essential equipment and implement in drilling, the technology of simultaneous casing & coring method by pneumatic DTH hammer drilling etc.In the light of outside pipe connecting screw thread crack in test production, the thesis puts forward the way to solve the stress concentration in outside pipe screw thread connection through changing the distance of outside pipe screw thread.The thesis recommends the test for landslide on Xiatong Street at Changdu in Tibet. The test acquired good technical effect of simultaneous casing & coring drilling, gathered more than 90% core, stratum sequence was clear(no pollution and no confusion), drill efficiency raised more than 100% comparing with common drill methods, met the standard and requirement of landslide geology reconnoitering。...