Державний Вищий Навчальний Заклад "Криворізький Національний Університет"
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Priority to UAU201508600UpriorityCriticalpatent/UA106211U/en
Publication of UA106211UpublicationCriticalpatent/UA106211U/en
Drilling And Exploitation, And Mining Machines And Methods
(AREA)
Earth Drilling
(AREA)
Abstract
A blast hole charge, drilled in the mountain range in the contours of excavation, including the cavity of the hole in which is placed a charge of explosive with means of initiation, as well as taps, isolating the explosive charge from the space generation. In the cavity of the hole in its end part is a cylindrical restrictive element from a material with acoustic stiffness, the value of which is less than the acoustic stiffness of the rocks in the contours of excavation, the length of the restrictive element is equal to the estimated length of "glass" - section of the end part of the hole formed after the collapse of the rock for sinking of workings.