|This method is only used in loose rock using completely different equipment. In certain regions, however, it can be the ideal well drilling method.
The soil is brought to light with the help of special drilling grabs. Simultaneous lowering of pipe work prevents the walls from collapsing. Following the installation of the filter set, the piping will be pulled out again upon the insertion of the gravel filling. An ideal feature of this procedure is that it does not affect the condition of the soil and that it provides precise information. Thus it is ensured that gravel fillings can exactly be measured and built up.
To be careful with the structure of the gravel fillings is of crucial importance for the continuous performance of this type of well.
Direct flushing procedure & Air-lift procedure