DEEP-HOLE STEMMING Russian patent published in 2004 - IPC

FIELD: drilling and blasting operations, in particular, locking of gaseous products of explosion in the charge space, applicable in explosive destruction of rocks by the method of deep-hole charges. SUBSTANCE: the invention is characterized by the fact that the deep-hole stemming is made of plastic polymeric material and has the shape of a cylinder, whose diameter is commensurable with the diameter of the deep hole with an axial inner cavity, having the shape of an elongated hemisphere conjugated to a truncated cone, it directly joins the explosive charge, the cylinder is made hollow and thin-walled, and the mentioned axial inner cavity is made in the form of a thin-walled funnel, whose walls have the same thickness as the cylinder walls and are made of the same material, the space between the funnel and the cylinder is filled with an inert material, the thickness of the cylinder walls and the funnel makes up 2 to 4 mm. EFFECT: simplified arrangement of the stemming inside the deep hole at different coefficients of drilling-out and roughness of the deep-hole walls due to enhanced elasticity of the structure+ADs- simplified manufacture of the stemming at a use of thin-walled profiles+ADs- considerably reduced cost due to the saving of the material. 2 cl, 2 dwg