Figure 5-14.-Multiple-bench quarry.
than one level. All benches must be made wide enough
to allow the use of equipment to remove blasted rock
(50 feet minimum). Multiple-bench quarries make
possible greater continuity of operation than
NOTE: When you are developing a multibench
quarry, blasting must be confined to only one bench at
a time. Simultaneous blasting at several levels is NOT
permitted under any circumstances.
CESE is available in the Naval Construction Force
TOA to enable construction units to meet their own
aggregate production requirements. Quarry equipment
is subject to exceptionally hard wear due to the abrasive
action of rock and rock dust; therefore, the operators
maintenance procedures contained in the
manufacturers maintenance and service manuals must
be strictly followed.
The equipment used in hard-rock quarries
consists of bulldozers, air compressors, rock drills,
drill steel and bits, loading and hauling equipment,
and miscellaneous tools. As the supervisor in charge
of quarry operations, you must ensure that operators
maintenance 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,
Equipment used in quarry operations should be
wear-faced. Wearfacing greatly extends the usable life
of construction equipment, ensures efficient operation
with less downtime, and greatly reduces the need for
spare parts. Guidelines for wearfacing equipment parts
and accessories are outlined in the NCF Welding
Materials Handbook, NAVFAC P-433.