Initiation method of deep hole blasting for dismounting building

Abstract

The invention relates to the technical field of blasting, in particular to an initiation method of deep hole blasting for dismounting a building, which is characterized by carrying out a deep holes arrangement design and a perforation construction, carrying out a time delay design of blasting detonators blasted in the deep holes and a construction of filling explosives in the deep holes, designing a time delay blasting of ground network detonators, and connecting detonators in blast holes with ground network detonators, wherein adjacent blast holes at detonation points are asymmetrically blasted. The pitch between arranged deep holes is 2.5-6.5m, the row spacing is 2.5-6.5m, and the depth deltah of the deep hole is 0-3.5m. Every two adjacent deep holes of the detonators among mainly control rows of deep holes are taken as one group, the delayed time of the first group of deep holes is 9-25ms, the delayed time of the second group of deep holes is 17-42ms, circulation is sequentially carried out; and the delayed time of the detonators among branch rows of deep holes is 42-100ms. The invention has the characteristics of large blasting amount, high detonation energy, little vibration,low cost, safety, reliability and the like.

Description

technical field [0001] The invention belongs to the technical field of blasting, in particular to an initiation method for deep hole blasting of demolished structures. Background technique [0002] Deep hole blasting is widely used in the production blasting of large and medium-sized open-pit mines. It is characterized by a large amount of blasting at one time, a large amount of explosives, high operating efficiency, and high blasting energy. However, the harmful effect of blasting vibration during blasting is also relatively large. [0003] Now the mine has gradually adopted the advanced blasting effect and the hole-by-hole differential sequential blasting technology. The feature of this technology is that the detonator delay initiation design is adopted at equal intervals between the blast holes and rows. The delay range usually used: 25ms ~75ms, which can meet the quality needs of mine blasting, and the demolition of mine structures, especially reinforced concrete structu...

AI Technical Summary

Problems solved by technology

[0005] 1. If the demolition blasting is carried out according to the conventional blasting initiation method, and the interval between the holes and the rows is delayed, although the blasting energy at one time is relatively large, the blasting energy per unit volume actually applied to the demolition blasting body during blasting is insufficient;

[0006] 2. If the sequential differential detonation between rows is used to meet the requirements of blasting energy, at the same time, the blasting vibration is more harmful, often causing the surrounding buildings and facilities to fail to meet the vibration safety requirements

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