Method for improved programmed explosive hole boring in driving galleries in rock and tunnel drilling

摘要

The method for improved programmed explosive hole bore in driving a gallery or a tunnel by drilling and explosive work, and corresp. to a pre-programmed drilling scheme firstly in accordance with individual findings and the geological situation mostly in the middle of the work face in predetermined direction one or more large bore holes are drilled or a wedge-shaped break-in is exploded. The drill waste falling on the ground is then removed.The gallery drilling vehicle is then positioned at a fixed distance from the work face, the drill carriage is then brought by the operator to the basic position of the first explosive hole parallel to the large bore holes and after drilling this first hole the carriage is moved to the position of the next explosive hole in accordance with the drilling scheme. The drill waste is removed by flushing with air-fluid or straight fluid.