Long hole tophammer drilling tool ODEX series

Drilling through formations with loose,unconsolidated material always comes with problems such as the bore hole cave-in collapse.How to avoid these problems?With years of field pratice and reserch,Teamwhole had developed its eccentric casing system application for strata with silt,sand or small size pebbles.With its simple struture,easy operation and reliable performace,this system can advance the casing easily for depth within 30 meters.And it's retrievable with long serive life. 1.When drilling starts, the ODEX reamer swings out and reams the pilot-hole wide enough for the casing tube to slide down behind the drill bit assembly. 2 When the required depth is reached, rotation is reversed carefully, whereupon the reamer swings in, allowing the drill bit assembly to be pulled up through the casing. 3.Casing tubes that are to be left in the drill hole should be sealed at the bottom of the hole by means of cement grout or some other sealing agent. 4.Drilling continues to the desired depth in the bedrock using a conventional drillstring.