Town rock medium-length hole accurate controlled blasting method

Abstract

The invention discloses a town rock medium-length hole accurate controlled blasting method which comprises the following steps of: (1) designing and calculating blasting parameters and according to a blasted object, determining hole pattern parameters, a hole arrangement mode, a drilling depth, a charge structure, a length of stemming, a priming circuit, elementary error time, a firing order and explosive single consumption, carrying out checking calculation on a flying stone distance and calculating a safety distance of a blast wave; (2) carrying out arrangement before blasting, which comprises hole arrangement, hole drilling, formed hole inspection and acceptance, charging, stemming, networking and safety alert; and (3) blasting and checking a blasting effect. In the blasting method, initiating equipment is a digital electronic detonator; at least two layers of explosive bags are arranged in blast holes; the explosive bags on the same layer on the same row are on the same plane and the explosive bags on the adjacent rows are arranged in a staggered mode; and in the initiating process, the blasting is carried out from the hole bottom to the hole top from bottom to top by adopting a V-type sequence. According to the invention, by the characteristics of the digital electronic detonator, the specific charging structure and the specific initiating sequence, the accurate blasting on town rocks is implemented.

Description

technical field [0001] The invention belongs to the technical field of blasting, and in particular relates to a method for precisely controlling deep holes in urban stone cubes. Background technique [0002] Usually, there are two construction methods for excavation of earth and rockwork: controlled blasting of shallow holes in urban stonework and controlled blasting of medium and deep holes in urban stonework. The method of controlled blasting of shallow holes in urban stonework generally has low construction efficiency, long time of disturbing residents, and various relevant government departments are under great pressure to ensure construction; while the method of controlled blasting of medium and deep holes in urban stonework can be used at the highest level due to the small number of blasting times. Level blasting safety protection and warning measures, similar to demolition blasting safety protection and warning measures, all personnel and machinery within the warning ...

AI Technical Summary

Problems solved by technology

[0003] The controlled blasting of medium and deep holes in urban stone cubes can vary according to the types of blasting equipment (mainly detonators: detonators), including the controlled blasting of medium and deep holes in urban stone cubes with differential electric detonators and the medium and deep holes of urban stone cubes with differential non-conductive blasting. Explosive tube detonator-controlled blasting, among which: deep-hole micro-differential electric detonator-controlled blasting in urban stonework. Because the electric detonator network used in the blasting network has extremely strict requirements on field stray currents and induced currents, it generally cannot be used in nearby areas. High-voltage lines, power plants, telecommunication towers, radio and television transmission towers and other construction sites that can generate stray currents and induced currents, and are greatly affected by the weather, and construction cannot be carried out in thunderstorm weather; at present, there are few series of differential detonators, poor quality, Problems such as large segment errors and insufficient delay time cannot meet the on-site needs of short-range protection buildings, and cannot solve the problem of short-range blasting vibration hazards; non-conductive blasting controlled by deep-hole nonel detonator detonators in urban stonework Although the explosion tube network effectively solves the impact of the electric detonator network on the surrounding power environment and weather, the reliability of the large network is low, and it still cannot solve the problem of short-range blasting vibration hazards

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