Shafts are the doorways to the underground, serving as the location at which all material enters and exits. They vary in size and depth, and their design and construction are key to the successful completion of any tunneling project.
The most common shaft construction methods, from simplest to complex, are:
- Trench boxes and speed slide rails
- Soldier piles and wood lagging (or steel plates)
- Liner plates
- Precast segments
- Conventional excavation with rock dowels and shotcrete
- Shee
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