Blast hole insulating device and blasting method

Abstract

The invention discloses a blast hole insulating device and a blasting method. The blast hole insulating device comprises an insulating barrel, a first sealing cap, a second sealing cap and a cushion column, wherein the cushion column is made from a ceramic fiber or glass fiber material, the insulating barrel is provided with an insulating chamber for arranging an explosive material, the first sealing cap and the second sealing cap are respectively connected to two ends of the insulating barrel for sealing an insulating chamber, a side wall of the insulating barrel comprises a force-bearing layer, a water absorbing layer and a resistance reducing layer, the force-bearing layer, the water absorbing layer and the resistance reducing layer are distributed in turn from inside to outside, the cushion column is shaped like a hollow barrel, one end of the cushion column is sealed, the other end of the same is open, and the end, provided with an opening, of the cushion column is matched with the end, provided with the second sealing cap, of the insulating barrel in a contact manner when the insulating barrel is matched with the cushion column. The blast hole insulating device disclosed by the invention has the advantages of low cost and reduced working strength of a worker, and the influence of a water source on blast is avoided.

Description

technical field [0001] The invention relates to the field of blasting heat insulation, in particular to a blasthole heat insulation device and a blasting method. Background technique [0002] In my country's Shanxi, Inner Mongolia, Xinjiang and other places, there are a large number of spontaneous coal mine fire areas. Open-pit drilling and blasting is generally adopted in coal mine fire areas, but the spontaneous combustion of the coal seam heats the surrounding rock, making the temperature of the blast hole above 500°C, and the safe use temperature of the industrial explosives used in blasting is below 80°C, so measures must be taken. Make the temperature of the explosive in the blast hole below 80°C within a certain period of time. [0003] At present, there are mainly three ways to keep the temperature of the explosive in the high-temperature blast hole below 80°C. The first is the widely used method of injecting water into blastholes to cool down the temperature, but ...

AI Technical Summary

Problems solved by technology

The first is the widely used method of injecting water into blastholes to cool down the temperature, but the effect is not very satisfactory. First, coal mine fire areas are generally located in water-deficient areas, and water sources are scarce, so it is impossible to inject water into a large number of blastholes at the same time and for a long time; secondly, the water is extremely large. Part of it was lost from the cracks of the blast hole, but the temperature of the blast hole was not cooled, resulting in a poor cooling effect of water injection; the cooling process took a long time, which affected the blasting arrangement; The temperature may rise rapidly; thirdly, the integrity of the local blast hole is good, and it will become a water hole after water injection, which will affect the charging speed and blasting quality; the final cooling process will cause great damage to the rock wall of the blast hole, and hole collapse and hole jamming will easily occur

The second method is to protect the explosives with a heat-insulating sheath, but the material used in the heat-insulating sheath is a multi-layer high-temperature-resistant heat-insulating material, which is expensive, uneconomical, and difficult to use on a large scale, and the thickness of the heat-insulating sheath is relatively thick. Large, easy to get stuck in the charging process, affecting blasting safety

The third is to use a water storage device within the entire length of the blast hole, so that the explosive is located in the water environment. The operation of this device is more complicated, easy to punch, and the water storage device may leak during use, which is safe. Hidden danger

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