专利汇可以提供Drill-and-blast excavating apparatus and method专利检索,专利查询,专利分析的服务。并且Drill-and-blast excavating apparatus has a powered carriage having a forward end which confronts a face in a geological formation; supporting arm members pivotally mounted on the carriage; drill-and-blast modules pivotally and rotatably mounted on the supporting arm members, the modules being adapted to drill holes in the face, load the holes with charges of condensed secondary explosive, and thereafter deliver energy to the charges in the holes to initiate the charges; explosives supply and feeding means communicating with the modules; a ventilating unit; at least one pair of gathering arms and a conveyor associated therewith mounted on the lower, chassis portion of the carriage; and protective shielding means including one or more transverse barriers mounted on the carriage behind the supporting arm members and drill-and-blast modules and forward of the explosives supply means, and adapted intermittently to engage the surrounding surfaces of an underground opening as a seal to effect pressure and noise attenuation. A process comprising performing substantially concurrent groups of drill-load-blast sequences in substantially continuous succession while removing muck and airborne fumes, and attenuating blast pressure and noise in an environmental transition region behind the face to the extent that blast pressure and noise levels in a zone behind the transition region, e.g., a zone up to about 50-100 feet from the face, are within prescribed safe limits of human tolerance.,下面是Drill-and-blast excavating apparatus and method专利的具体信息内容。
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