The circuit and structure of the equipment on suppression of a dust are proved at explosive works and crushing of rocks. Use in an alternating mode different polarity liquids allows to raise (increase) essentially efficiency suppression of a dust.
The shape of the complete set of the equipment for ventilation deep career by cascade explosion of a fuel -air mix is proved. The complete set of the equipment includes the basic units and elements: capacity of siphon type, a support for accommodation of charges ВВ, devices of management of undermining and the device of the control.
Changes in the explosive characteristics of gelpor associated with its aging have been studied. The changes consist in the decrease of energy release of "old" gelpor up to 2 times in comparison with "fresh" one. Recommendations on application of gelpor in engineering are given.
