Method for side air supply of driving face of large-diameter deep vertical shaft

Abstract

The invention provides a method for side air supply of a driving face of a large-diameter deep vertical shaft. According to the method for side air supply of the driving face of the large-diameter deep vertical shaft, for a high-temperature driving face of a deep vertical shaft with the diameter larger than ten meters, a vertical flexible air duct is connected with a traditional vertical main air supply duct and a four-way main air inlet pipe fixed to the bottom side of a last-layer hanging scaffold, transverse flexible air ducts are connected with branch air inlet pipes of a four-way device and guiding air inlet pipes installed at the bottom of the last-layer hanging scaffold, and then fresh air flow can be directly supplied to the driving face located below the last-layer hanging scaffold. The guiding air inlet pipes are installed on the lower side of the last-layer handing scaffold through a suspender, both the air supply angle and the air supply height of each guiding air inlet pipe can be adjusted, so that air can be supplied to different areas of the driving face, and the functions of vertical ventilation and dust removal are also achieved. By the adoption of the method for side air supply of the driving face of the large-diameter deep vertical shaft, most areas of the driving face are located on the fresh air flow side, the occupied area of the flexible air ducts and the guiding air inlet pipes is small, normal driving construction of the vertical shaft is not influenced, additional arrangement of a tail-end draught fan is not needed, multiple-angle side air supply with multiple air inlet pipes can be achieved through the air pressure of a main ventilation fan, and the thermal environment of the high-temperature driving face of the deep vertical shaft is remarkably improved.

Description

technical field [0001] The invention relates to a ventilation method during shaft excavation, and is especially suitable for ventilating and cooling the excavation surface of a large-diameter high-temperature shaft with a diameter exceeding 10 meters. Background technique [0002] According to the third national coal resource forecast, the coal resources within a buried depth of 2000m are 5.57×10 4 million tons, of which more than 65% are buried deeper than 800m. With the depletion of front resources, the development of deep resources is imperative. [0003] For the deep development of coal and other resources, in order to improve mining efficiency and recovery rate, building large-scale mines is the best choice. Statistics show that in 2008, the number of large-scale mines in my country was 338, an increase of 145% over 2003. [0004] For the excavation construction of deep shafts, when the excavation reaches a certain depth, the temperature of the original surrounding r...

AI Technical Summary

Problems solved by technology

[0005] For large-diameter deep shafts with a diameter of more than 10 meters, because the working area at the bottom of the well is greatly increased compared with the shallow shaft, the air flow cannot be fully convected and diffused in the space of the working face during traditional tunneling ventilation, which cannot effectively improve the working environment of the tunneling surface, and conventional ventilation The dust removal function is also restricted

At present, there is no suitable air supply method to improve the thermal environment of deep shafts, which restricts the construction of large deep mines

Images