A Mixed Construction Method of Radiant and Stepped Small Patios with Tall and Large Chambers

Abstract

The invention provides a small-raise radiation type and step type mixed construction method for a tall and large chamber. The method comprises the following steps: tunneling small raise groups to a preset height, penetrating connection channels among the small raise groups to form radiation type conical well groups, expanding an arch crown till chamber arch crown excavation and support are finished; after excavation and support of all arch crowns are finished, continually expanding the small raise groups till the lower part height of the chamber is suitable for a height required in a positive-step construction method, performing lower-part construction on the chamber by a step method, performing temporary support when the wall part of the chamber is excavated to a design position, and deciding primary molding support or secondary molding support for a chamber wall part according to a rock exposure situation. The method has the characteristics of low de-slagging cost, simple de-slagging process, safety, environmental protection and the like, the construction cost can be lowered, the safety risk is lowered, and the quality is easy to control.

Description

technical field [0001] The invention belongs to the technical field of mine construction, and more specifically relates to a mixed construction method of radial and stepped small patios with tall and large chambers. Background technique [0002] The chamber is a kind of underground roadway whose three axis lengths are not much different and does not lead directly to the ground, such as winch house, substation, coal bunker, etc. The excavation types of chambers are divided into step method, full-section construction method, pilot tunnel method, etc. according to their function and size. Higher and higher, especially the tall and large chambers with a height of more than 12m, a length of more than 30m, and a width of more than 10m. This kind of chamber can not only install more mechanical equipment, store more materials and tools, but also has the function of avoiding danger. Such as the San Jose copper mine disaster in Chile, which occurred on August 5, 2010, and 33 miners w...

AI Technical Summary

Problems solved by technology

However, due to the large cross-sectional size and large span of tall and large chambers, the potential safety hazards in the construction process will also increase accordingly. Using the above-mentioned pilot tunnel method or full-section construction method, first, the early support procedures are complicated, and personnel safety is difficult to guarantee. The second is that the quality of the formed chamber is not high. The most important and most concerned factor is the large investment and high cost

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