Blasting method for high-temperature sealed fire areas

Abstract

The invention discloses a blasting method for high-temperature sealed fire areas. The blasting method comprises the following steps that a, blasting design is carried out; b, holes are distributed; c, holes are drilled, checked and accepted; d, five-position temperature measurement is carried out, wherein temperature measurement is carried out twice, according to the temperature measurement of the second time, thermal insulation pieces are placed in blast holes firstly, then the gaps between inner cylinders and outer cylinders of the thermal insulation pieces are filled with water, and the temperatures of all points between the inner cylinders and the outer cylinders are measured ten minutes later; e, design approval is carried out; f, temperature is measured before explosive filling; g, blasting supplies are transported; h, blasting warning is carried out; j, explosive filling preparation is carried out, wherein adhesive plasters are used for fixing explosive columns and filling sections on the same bamboo bar; k, explosive filling is carried out; l, evacuation is carried out; m, initiation is achieved; n, inspection after blasting is carried out; o, warning is withdrawn. According to the method, the thermal insulation pieces are used for separating the temperatures of the blast holes and the explosive and the initiation supplies, the method is simple and reliable, good in safety, low in cost, long in rebound time, and capable of reliably and safely guaranteeing explosive filling and further safely and efficiently achieving blasting.

Description

technical field [0001] The invention relates to a blasting method, in particular to a blasting method used in a high-temperature fire zone. Background technique [0002] In my country's Xinjiang, Inner Mongolia, Ningxia, Shanxi and other areas where coal seams are buried shallowly, more and more coal mines adopt open-pit mining technology, and the number of underground mines converted to open-pit mines is gradually increasing, and coal seam combustion in open-pit coal mines will form high-temperature fire zones. [0003] Existing blasting method steps that are used in high-temperature fire areas are as follows: a, blasting design, design blasting parameters such as hole depth, hole row spacing, blast hole height, unit consumption, network, etc. Generally, it is 10m, and the blasting design specification shall be compiled; b. Hole layout, the position of the blast hole shall be marked on site according to the parameters indicated in the blast design; c. Perforation and accept...

AI Technical Summary

Problems solved by technology

However, due to the large amount of time and water needed for water injection to cool down, and the limitation of the number of blast holes in a single blast, the scale and progress of blasting in the fire zone are greatly reduced. Secondly, the temperature rebound time in the fire zone is sometimes affected by natural conditions or drilling reasons. However, it cannot fundamentally solve the problem that the blasthole temperature acts on explosives and detonating materials, and there are still certain safety hazards during blasting.

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