High-temperature blast hole cooling method

Abstract

The invention provides a high-temperature blast hole cooling method. The high-temperature blast hole cooling method comprises the following steps that (1) water and cement grout are injected into an injection machine which is provided with a water spraying rod and a grout spraying rod; (2) the injection machine is installed at a blast hole position, the water spraying rod and the grout spraying rod are made to stretch into a blast hole and be aligned with the center of the blast hole position; (3) the water spraying rod descends, and a water spraying nozzle is used for spraying water on the wall of the blast hole; (4) the water spraying rod ascends, the grout spraying rod descends at the same time, a grout spraying nozzle of the grout spraying rod begins to spray the cement grout in the lower direction and the horizontal direction at the same time when the grout spraying rod descends to the bottom of the blast hole, then the grout spraying rod ascends, and the grout spraying nozzle conducts grout spraying process continuously in the ascending process of the grout spraying rod and stops spraying grout when ascending to the opening of the blast hole; (5) after the grout in the blast hole is solidified, water is injected into the blast hole for cooling. By means of the high-temperature blast hole cooling method, the safety and the operation scale of blasting operation in a high-temperature burning area can be improved, safety is high, water resources are saved, and very high application and popularization value is achieved.

Description

technical field [0001] The invention relates to the field of high-temperature fire zone blasting, in particular to a method for cooling a high-temperature blast hole. Background technique [0002] In my country's Xinjiang, Inner Mongolia, Ningxia, Shanxi and other areas where the coal seams are buried shallowly, due to the coal seam outcropping in open-pit coal mines, the coal seam spontaneous combustion zone and the airtightness of the gob area are not strictly sealed, and the air enters to form a spontaneous combustion zone, forming a large high-temperature fire zone. . The "Blasting Safety Regulations" stipulates that blasting operations with a blasthole bottom temperature higher than 60°C are high-temperature blasting. When the blasthole temperature exceeds 60°C, special blasting safety measures must be taken, including cooling down the blasthole, using high-temperature-resistant blasting equipment and thermal insulation protection for explosives, etc. [0003] At prese...

AI Technical Summary

Problems solved by technology

The above problems seriously restrict the progress of blasting operations in high-temperature fire areas, especially in areas with severe water shortages in the north, where water resources are extremely wasted and safety hazards are high

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