Procedure for bidirectional drilling and demolishing with explosive and apparatus for drilling blast holes using the same

摘要

Procedure for drilling blast holes for demolition with explosives of a predetermined top half section of a pilot tunnel excavated by a drilling machine. It comprises the stages of drilling the blast holes in the top half section in a predetermined direction and simultaneous drilling of longitudinally axial blast holes in a more external section of excavation of the pilot tunnel, filling the holes with blasting powder and simultaneous filling of a precise powder in the outermost axial blast holes, firing of the powder and clearance of the debris, and drilling only of axial blast holes in the outermost section again, because the drilling of blast holes transversally has been completed inside a pilot tunnel already drilled. An associated apparatus is also provided, capable of precisely controlling the drilling angle and length of the transverse blast holes. (Fig. 5A) IMAGE