The raise boring method is a precise and efficient technique for constructing shafts in tunneling projects. This method involves drilling a pilot tunnel downward from the surface to the desired depth. Once the pilot hole reaches the target location, a reaming head is attached, and the hole is enlarged as it is pulled back upward, creating a smooth, circular shaft. This technique is highly effective for creating vertical and inclined shafts with minimal disruption and increased safety compared to
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