A Method of Accurately Controlled Blasting of Medium and Deep Holes in Urban Stonework

Abstract

The invention discloses a method for accurately controlling deep holes in urban stonework, which includes the following steps: (1) design and calculation of blasting parameters, determining hole network parameters, hole layout methods, drilling depth, charge structure, Blockage length, detonation network, differential time, detonation sequence, unit consumption of explosives, flying stone distance check and shock wave safety distance calculation; (3) Explosion and blasting effect inspection; the detonating material in the blasting method is a digital electronic detonator; at least two layers of charges are arranged in the blast hole, and the charges on the same row and on the same layer On the same horizontal plane, the charge claddings between adjacent rows are staggered; when detonating, a "V"-shaped sequence is used to detonate from the bottom of the hole to the top of the hole, and from the bottom to the top. The invention realizes the precise blasting of stonework in cities and towns by using the characteristics of the digital electronic detonator itself, as well as the specific charge structure and detonation sequence.

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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