RG Johnson employs conventional methods of vertical shaft construction including: blasting and excavating. In this video the "MUCK RG Johnson employs conventional methods of vertical shaft construction including: blasting and excavating. In this video the "MUCKING" or excavating process is demonstrated.
what lining is on the walls of the shaft? precast, shotcrete, cast in-situ?
sonofmoresby 1 month ago
where was this filmed?
kennymagnum 1 year ago