Gradient pre-splitting blasting method and device of lancing cartridges around vertical shaft

Abstract

An embodiment of the invention discloses a gradient pre-splitting blasting method and device of lancing cartridges around a vertical shaft. The method includes distributing directional-breaking blasthole rings around the vertical shaft, distributing wedge-cut blasthole rings in the center and distributing main blasthole rings with preset ring number from the center to outside; setting a blasting sequence that the directional-breaking blasthole rings blast first, and the blasthole rings from the center to outside blast sequentially; sequentially dividing the directional-breaking blasthole rings into a plurality of directional-breaking areas and setting the corresponding area blasting sequence; subjecting the directional-breaking areas to segmentation and setting the corresponding segmental axial blasting sequence; putting explosive into lancing tubes and inserting nonel detonators corresponding to the segmental axial blasting sequence into the lancing tubes to make lancing cartridges; placing the lancing cartridges in directional-breaking blastholes around the vertical shaft, filling and sealing the wedge-cut blastholes and the main blastholes, and connecting the blastholes to form a detonating network. By the use of the gradient pre-splitting blasting method and device, blasting damage is reduced during the blasting, and blasting effect is improved.

Description

technical field [0001] The invention relates to the blasting technology of large-diameter vertical shafts, in particular to a method and a device for pre-splitting blasting with a gradient charge pack around vertical shafts. Background technique [0002] With the gradual scarcity of current resource exploitation, the diameter of vertical shafts used for mining resources is getting larger and larger, and the depth of the wellbore is getting deeper and deeper, which makes the construction of the shaft more and more difficult. Among them, before the wellbore construction, the freezing method is generally adopted, that is, before the wellbore is excavated, holes are drilled downward at intervals from the ground along the concentric circumference of the well to be built at a certain distance, and the bottom of the hole goes deep into the impermeable layer, and then in each Put the freezing tube in the borehole, and install the freezing equipment on the ground, and use the circula...

AI Technical Summary

Problems solved by technology

However, in this method, due to the simultaneous detonation of the slit charges around the vertical shaft and the limitation of the structure of the large-diameter vertical shaft, most of the blasting has the phenomenon of over-excavation, under-excavation, uneven surrounding and serious slope damage, which makes the blasting effect Not ideal; at the same time, the explosion hazard caused by simultaneous detonation is still relatively large

Images