Figure 5-14.-Multiple-bench quarry.than one level. All benches must be made wide enoughto allow the use of equipment to remove blasted rock(50 feet minimum). Multiple-bench quarries makepossible greater continuity of operation thansingle-bench quarries.NOTE: When you are developing a multibenchquarry, blasting must be confined to only one bench ata time. Simultaneous blasting at several levels is NOTpermitted under any circumstances.QUARRY EQUIPMENTCESE is available in the Naval Construction ForceTOA to enable construction units to meet their ownaggregate production requirements. Quarry equipmentis subject to exceptionally hard wear due to the abrasiveaction of rock and rock dust; therefore, the operator’smaintenance procedures contained in themanufacturer’s maintenance and service manuals mustbe strictly followed.The equipment used in hard-rock quarriesconsists of bulldozers, air compressors, rock drills,drill steel and bits, loading and hauling equipment,and miscellaneous tools. As the supervisor in chargeof quarry operations, you must ensure that operator’smaintenance is performed and that all cutting edges,end bits, teeth and shanks, dozer tracks, tires, blades,and so forth, are checked daily for wear, adjustments,and cracks.WearfacingEquipment used in quarry operations should bewear-faced. Wearfacing greatly extends the usable lifeof construction equipment, ensures efficient operationwith less downtime, and greatly reduces the need forspare parts. Guidelines for wearfacing equipment partsand accessories are outlined in the NCF WeldingMaterials Handbook, NAVFAC P-433.5-15
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