Allied Construction Products, LLC. www.alliedcp.com
13
TM103337_HP1600_18feb
8.0 Operation – [cont'd]
5.
Maintain down pressure as the material
compacts. For larger areas, decrease boom
down-force and slide the compactor over the
material with a repetitive, back and forth motion.
The initial pass is continued until compaction is
no longer apparent, typically 5 to 15 seconds.
Run the compactor until maximum density is
achieved but avoid unnecessary run time that
can lead to loosening of soil previously
compacted.
6.
Repeat compacted lifts as necessary until a
finished surface is achieved. Optimum
compaction is usually obtained with two passes.
The duration of the initial pass is dependent on
depth and material. The second pass may
require additional fill material and repositioning of
the Ho-Pac to achieve finished grade.
7.
After compaction is complete, re-position the Ho-
Pac and/or carrier to continue working.
NOTE
:
Over-stretching the rubber springs will
shortened spring life. Heat build-up from prolonged
operating cycles will contribute to shorter spring life.
Stop the Ho-Pac during repositioning to help
minimize heat-aging of rubber.
The rate of compaction to a 95% Modified Proctor will
vary due to many factors, including variations in
operator technique. Other factors that will produce
different results include -
x
Soil densities are reduced at the bottom of
excessively high lifts. It may be necessary to try
different lifts to determine the maximum and most
effective lift that can be used and still achieve the
required density.
x
Compaction is affected by material type. Soils
with 50% or more granular content are the most
responsive to compaction through vibratory
action.
x
Moisture content is also critical to achieving
maximum compacted densities of fill material. Fill
materials may need conditioning prior to
compaction.
IMPORTANT
Always practice proper operating techniques.
x
Uneven or excessive down pressure applied to
the rubber springs will create contact between
the mounting frame and compaction plate. Do
not stretch the rubber springs further than
approximately one-half (1/2) their width.
x
Do not use the Ho-Pac to lift or push materials.
x
At temperatures below 32
o
F (0
o
C), allow the oil
to warm before operating. Next, operate the Ho-
Pac for a few minutes at idle speed with only
light down pressure to warm the rubber springs.
x
Do not operate the Ho-Pac if the hydraulic oil
temperature exceeds 180
o
F (80
o
C)
x
Do not operate the Ho-Pac underwater.
x
Do not operate the Ho-Pac without the
compaction plate attached. A dynamic
imbalance may result in equipment damage.
The Allied Ho-Pac combines three actions that are
highly effective in the compaction of granular type
soils:
1.
Vibration
– The vibratory action is generated by
the hydraulic motor that drives the out-of-balance
eccentric mass turning at a high rpm. Granular
soils are extremely responsive to consolidation
by vibration. Soil particles are set in motion and
settle under their own weight. The air surrounding
these particles is forced out, which allows them to
pack closely together.
2.
Impulse Force
- Generated by the centrifugal
force of the rotating eccentric mass. When
properly controlled, this also gives an impact
force.
3.
Down Force
– A pressing force exerted by the
carrier against the rubber springs.
8.3 Compaction Handbook
Further information is available in the “Compaction
Handbook”. To request a copy, contact your local
dealer or Allied’s Customer Service. Ask for part
number 103392.