Lesson 2/Learning Event 3
Learning Event 3
DESCRIBE THE PLANT INSTALLATION CONSIDERATIONS
After the layout of the quarrying site has been determined, prepare a detailed operations plan. This plan
should specify the methods and procedures to be followed for the entire life span of the quarry. It
should take into account the factors of required production, equipment available, site conditions,
maintenance requirements, safety requirements, and troop availability and training.
You should start work on the installation of the crushing, screening, and washing plant as soon as
possible after the site becomes accessible. Work can then progress simultaneously with the construction
of access roads and opening of the quarry. The crushing operation is normally done on two levels (see
Figure 6), requiring construction of a retaining wall.
Plant site preparation consists of the following basic steps:
Preliminary Earthwork. Initially, cut the lower level of the site to the proper grade and dimensions. A
predetermined portion of the excavated material may be deposited above the planned headwall
anchorage for later use in backfilling behind the retaining wall. Where necessary, earthwork may also
include the excavation of water storage and settlement ponds.
Hardstands. Plant equipment should be stationed on stable hardstands which are capable of supporting
the weight and vibration of the plant without settlement. Ideally, hardstands should be constructed of
reinforced concrete, but this is seldom practical in the theater of operations. A primary crusher can be
used to provide base course material for hardstands. This material should be carefully leveled and
thoroughly compacted to provide adequate support.
Headwalls. You may begin work on the crusher headwall after completion of the earthwork on the
lower level. Support for the headwall may be provided by driven piles. Holes may be drilled and piles
or posts set in and concreted individually. Or the base of the wall may be entrenched and piles set in a
continuous concrete footer.
STATIONING THE PLANT
Crushing and screening plants can be operated from their wheelbase for short periods. However, it is
better on longer and more deliberate jobs to block