DRILLING OF WATER WELLS/TUBEWELLS
This method is suitable for soft and fissured rock formations. In purely soil formations, it gives very high working rate. This method consists in breaking down and pulverizing the subsoil material by repeated blows with a cutter made of hard metal. The pulverized material mixes with water and then is removed. Sometimes this method is also called cable tool method. Bores as big as 30 cm in diameter and over 200 to 300 m deep can be drilled conveniently which meet normal requirements. Before boring the hole, water must be poured in. As the plunger drops down, slurry fills it up. The plunger is then taken out and the slurry is removed by turning it upside down. The plunger is again lowered and dropped into place again. This process continues until the casing pipe reaches a predetermined depth. When this happens, additional pipe may be added at the top of […]