Allied Construction Products, LLC www.alliedcp.com
TM577696_HP400B_16aug
13
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 Ho-Pac
repositioning to achieve finished grade.
7. After compaction is complete, re-position the Ho-
Pac and/or carrier to continue working.
NOTE
:
Exposure to abrasions, over-stretching and
heat build-up from prolonged operating cycles all
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 -
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.
Compaction is affected by material type. Soils
with 50% or more granular content are the most
responsive to compaction through vibratory
action.
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.
Do not allow mounting frame to contact base
plate. Spring mount and frame damage may
result. Stretch the spring mounts no more than
approximately one-half (1/2) their width.
Do not use the Ho-Pac to lift or push materials.
Damage to spring mounts and other
components may result.
Do not operate the Ho-Pac underwater. Bearing
damage may result.
Do not operate the Ho-Pac without the
compaction plate attached. A dynamic
imbalance may result in equipment damage.
At temperatures below 32
o
F (0
o
C), operate the
Ho-Pac for a few minutes without down force to
allow the spring mounts to warm.
Do not operate Ho-Pac with hydraulic oil
temperature above 180
o
F (80
o
C)
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 Ho-Pac 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.