| 摘要 |
FIELD: process of blastings in rocks, applicable in mining of non-metallic building materials and in case of flooded rock masses. SUBSTANCE: for use in flooded bore-holes of hydrolabile lost-cost explosives, the deep-hole charge including a hydrolabile explosive enclosed in a cylindrical shell of nonsoakable material, whose length exceeds the length of the explosive charge, is placed on the bottom of a water-filled deep-hole. The explosive charge is hermetically closed with a layer of thermoplastic material, for example, asphalt, which from the top is filled up with large ballast up to the upper edge of the shell. The shell of the deep-hole charge is made of polyethylene pipe with a hermetically sealed lower end. Besides, the deep-hole charge lowered to the bottom of water-filled a deep-hole is additionally filled up with ballast tamping. EFFECT: enhanced reliability of the charge at reduced cost of its manufacture. 3 cl, 2 dwg |
