A reverse digging and penetration blasting method that does not damage the existing shaft when the shaft is extended

Abstract

The invention discloses a reverse digging penetration explosion method having no damage to an installed or used shaft when the shaft well extends. Before a reverse digging penetration rock column (10) to be exploded at the last time, a peripheral bubble curtain generation pipe (12) with jet small holes (11) in the inner side and a middle reinforcing bubble curtain generation pipe (13) with jet small holes (11) in the two sides and the upper part are arranged along the shaft well wall from the bottom of a shaft (17) at a certain distance upwardly, and the peripheral bubble curtain generation pipe and the middle reinforcing bubble curtain generation pipe are communicated with a high pressure air supply pipe (14), water is injected to the bottom of the shaft well along the well wall from a lowest middle driftway (1) of the installed or used shaft, a mine high-pressure air supply pipe supplies air to the peripheral bubble curtain generation pipe (12) of each layer, and the reverse digging penetration rock column (10) to be exploded at the last time is exploded at the end. The damage to the shaft equipment at the bottom of the installed or used shaft on a large scale by the explosion flyrocks and air shock waves of the last explosion can be prevented when the shaft well extends and the reverse digging penetration is carried out, and the phenomenon that the detachment and reinstallation of the damaged shaft require that the mine needs to stop operation for a long time before and after the reverse digging penetration is carried out during the extension of the shaft can be prevented.

Description

technical field [0001] The present invention relates to a vertical shaft extension reverse digging and penetration blasting method, in particular to a vertical shaft that has been installed or is in use, needs to be extended but cannot be shut down, and does not cause damage to the existing shaft (equipment) when reverse drilling is used. method. Background technique [0002] Shaft shafts are widely used in iron and steel, nonferrous metals, gold, chemical, coal and other underground mines. In some mines, due to the staged development or the lack of exploration of the lower resources during the original shaft construction, the resources are not clear, and the existing shafts have not been installed in place at one time. Later, with the development of production, the middle section was extended downwards, and correspondingly, the shafts that had been installed and were in use needed to be extended downwards. At present, the common practice is to leave a rock pillar of a cer...

AI Technical Summary

Problems solved by technology

However, when the rock pillar penetrates through the last blasting, due to the impact of blasting flying stones and air shock waves, the use of existing technologies will often cause greater damage to existing wellbore facilities, especially the bottom of the wellbore, and a large area of ​​the bottom of the well will be destroyed. Shaft equipment such as tank road, tank beam, ladder room, etc. are impacted and deformed, causing the mine to stop production for a long time to remove and reinstall the damaged shaft equipment

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