
Excavation of a technological duct for a vertical shaft ...
misc{etde_, title = {Excavation of a technological duct for a vertical shaft using the NPK40 system} author = {Mustafin, Z Sh, Shalagin, A M, and Orlov, N V} abstractNote = {The Ukrshakhtostroi has developed the NPK40 integrated system for shaft sinking. It has been used for excavating the top zone of shafts to 40 m deep with a diameter of up to 12 m.