a machine for sinking vertical shafts. The aggregate is used in rock up to medium hardness (hardness coefficients up to 8 on M. M. Protod’iakonov’s scale). It combines several processes: disintegration of the rock, the loading of bulk rock into hoisting buckets, the installation of permanent shaft formwork, drainage, and the installation of pipe sections. The aggregate has a three-level metal framework, in which the equipment is installed.
PD shaft-sinking aggregates have been used in the USSR in the Karaganda Coal Basin to sink four shafts with a total depth of more than 2,150 m and in the Donets Coal Basin to sink one shaft to a depth of more than 520 m. The sinking rates achieved by the aggregates were 133 m of finished shaft per month in Karaganda and 175 m per month in the Donets Coal Basin. World records were set for labor productivity of shaft sinkers—13.23 (Karaganda) and 12.7 m3 (Donets Coal Basin) of finished shaft per worker per shift. The aggregates require three workers per shift to operate.
Shaft-sinking aggregates represent a new stage in the development of the technology for sinking shafts. They allow a fivefold to sixfold increase in labor productivity, eliminate heavy physical labor, ensure a high degree of safety in mining work, and improve health conditions. The first shaft-sinking aggregate was built in 1952 in the USSR.
A. S. BANK