TESTS OF IMPORT SUBSTITUTING BURIED PNEUMOHAMMERS OF HIGH PRESSURE
In the paper, technical and economic advantages of using buried pheumohummers of high pressure including increasing of boring rate up to 1000mm/min and life time increasing up to 5000 buried meters and more are shown. Construction features of pheumohummers of high pressure concluding in using schemes of closed type and slide-valveless system of air distribution are considered. Native scheme of buried pheumohummer meeting all requirements with hummer without inner channels, weakening its cross-sections is represented. Constructions of pheumohummers PV170 and PV 130, created by this scheme, are considered; its parameters are represented. Conditions of pheumohummer prototypes tests at various areas are shown. Some test results are represented. Mechanical boring rate by pheumohummer PV 130 of granite is 600mm/min. It does not yield to foreign analogues.