Ndị DTH hammers na ngwongwo buru ibu

Nkọwa ndoro nke nke ukwuu nke Down-The-Hole (DTH) na-egbu nwere ike ịdị mkpa n'ulo nkọwa ndoro na ụlọ ọrịa ndoro n'okpuru ugbu a na-akpọ soil nailing na ụlọ ọrịa ndoro nke ugbu a. DTH na-egbu ndoro na-egbu pneumatic ma ọ bụ hydraulic na-egbu nke na-eme ka ike tụọrọ n'ime ọnụ ọnụ drill bit n'oge ndoro drill string, na-enyere aka ịdị mfe n'oge ndoro n'ime umeala ndoro dị mfe ma ọ bụ ndoro n'ime umeala ndoro dị mfe ma ọ bụ ndoro n'ime umeala ndoro dị mfe. Nke a na-eme ka ndoro na-egbu na-eme ka ndoro na-egbu na-eme ka ndoro na-egbu na-eme ka ndoro na-egbu na-eme ka ndoro na-egbu. Nke a na-eme ka ndoro na-egbu na-eme ka ndoro na-egbu na-eme ka ndoro na-egbu na-eme ka ndoro na-egbu na-eme ka ndoro na-egbu. Nke a na-eme ka ndoro na-egbu na-eme ka ndoro na-egbu na-eme ka ndoro na-egbu na-eme ka ndoro na-egbu na-eme ka ndoro na-egbu.