Heat-resistant insulation sheath

Abstract

The invention discloses a temperature-resistance thermal insulation protecting bush which is used for charge blasting in a high-temperature blast hole and comprises a cylinder body with a cavity. The cylinder body is formed by stacking a fireproof layer, an insulation layer and a waterproof layer from exterior to interior in a composite mode, the cavity of the cylinder body is filled with a stick dynamite in a non-coupling mode, the gap between the inner wall of the cylinder and the stick dynamite is filled with high heat capacity liquid, the cylinder body is formed by stacking the fireproof layer, the insulation layer and the waterproof layer in the composite mode, each layer is made of heat insulation flame retardant materials, the heat conductivity coefficient is small, in the process that external heat energy is transmitted to the interior of the cylinder body, and the heat is gradually and greatly attenuated. Meanwhile, the high heat capacity liquid serving as energy consumed liquid is contained, the high specific heat capacity characteristics of the liquid are utilized for achieving energy conversion, a large amount of heat is absorbed, it is ensured that the temperature of the stick dynamite in the cylinder body is within the suitable range, under the heat insulation action of the cylinder and the heat absorption action of the high thermal capacity liquid, even though the temperature of the blast hole is high, blasting work can be safely performed, the bush is not limited by construction conditions, and operation is convenient and rapid.

Description

technical field [0001] The invention relates to the technical field of blasting engineering, in particular to a temperature-resistant and heat-insulating sheath for blasting in high-temperature blastholes. Background technique [0002] At present, the following methods are generally adopted for the blasting construction in the coal seam spontaneous combustion fire area: by reducing the drilling depth, changing the deep hole blasting to shallow hole blasting, and then injecting water into the blast hole to lower the temperature of the blast hole to below 80°C. Before the temperature of the blast hole rises, charge (the explosive is an ordinary industrial explosive and has not been subjected to high-temperature heat insulation treatment), filling, and detonation work quickly. The process generally does not exceed 3 minutes, so the entire blasting operation takes a very long time. Hasty, blasting operations in such a short period of time can easily lead to high mental stress of...

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Problems solved by technology

[0002] At present, the following methods are generally adopted for the blasting construction in the coal seam spontaneous combustion fire area: by reducing the drilling depth, changing the deep hole blasting to shallow hole blasting, and then injecting water into the blast hole to lower the temperature of the blast hole to below 80°C. Before the temperature of the blast hole rises, charge (the explosive is an ordinary industrial explosive and has not been subjected to high-temperature heat insulation treatment), filling, and detonation work quickly. The process generally does not exceed 3 minutes, so the entire blasting operation takes a very long time. Rush, blasting operations in such a short period of time can easily lead to high mental stress of workers, which can easily lead to safety accidents

[0003] At the same time, the traditional method of blasting still has the following defects: 1. With the continuous deterioration of the ecological environment caused by mining, the water resources in the mining area are also gradually exhausted. The simple method of water injection in the hole is single and has poor applicability; 2. The high temperature in the fire area Under the environment (80°C-350°C), the development of rock fractures is very good, and the development of rock fractures makes it difficult to retain water in the holes, and it is difficult to cool down in a short time (within 60 minutes) to meet the requirements of the environmental temperature of explosives; 3. The explosives used in blasting operations are also It is not a special high-temperature-resistant explosive. Although the high-temperature-resistant explosive that has been successfully developed is currently very expensive, it is mainly used in aerospace and military applications, and it cannot be extended to blasting in mines and coalfield fire areas; 4. Single blasting operations in fire areas The amount of explosives loaded (within 500kg) is small, and there are great potential safety hazards, which have seriously restricted the progress of stripping and excavation work

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