Prinsco HydroStor HS180, Руководство по конструкции

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Design Guide
Page 16 ©2015 Prinsco, Inc | 800.992.1725 | www.prinsco.com
05/15
Table 6 - Acceptable Backfill Requirements
Fill Material Location Material Description
AASHTO M43
Designation
[D] Final Backfill - Fill material for Layer D
starts at the top of the C layer to the bottom of
the pavement or to the finished grade of an
unpaved surface. The pavement subbase may
be part of the final backfill.
Any backfill which provides
adequate subgrade for the project
per the engineer's plans. Plans shall
indicate subgrade requirements.
N/A
[C] Initial Backfill - Material for layer C starts
at the top of the embedment zone (layer B)
and continues to 24" above the top of the
chamber for the HS180 and 18" for the HS75.
The pavement subbase may be part of the
initial backfill layer.
Well graded granular material,
<35% fines.
AASHTO M45
A-1, A-2, A-3
or
AASHTO M43
3, 357, 4, 467, 5, 56, 57, 6,
67, 68, 7, 78, 8, 89, 9,10
[B] Embedment Stone - Embedment stone
will surround the chambers and extends from
the top of the bedding stone (layer A) to the
bottom of the fabric layer. 3/4" to 2" washed, crushed, angular
stone.
AASHTO M43
3, 357, 4, 467, 5, 56, 57
[A] Bedding Stone - Bedding Stone extends
from the sub grade to the foot of the
chambers.
3/4'' to 2" washed, crushed, angular
stone.
AASHTO M43
3, 357, 4, 467, 5, 56, 57
Table 7 - Backfill Placement & Compaction Requirements
Fill Material
Location
Placement Methods /
Restrictions
HS180 Compaction Requirements HS75 Compaction Requirements
[D] Final Backfill
A variety of placement methods
may be used. All construction
loads must not exceed the limits in
Table 4.
Subgrade will be placed and compacted to
the requirements as shown on the site
plans.
Subgrade will be placed and compacted to the
requirements as shown on the site plans.
[C] Initial Backfill
Use of an excavator positioned off
bed is recommended. Small
excavators and small dozers may
be allowed based on the
information in Table 4.
Compaction will not begin until a
minimum of 24" of material is placed over
the chambers. Additional layers shall be
compacted in 12" lifts to a minimum of
95% standard proctor density for well
graded material.
Compaction will not begin until a minimum of
12" of material is placed over the chambers.
Additional layers shall be compacted in 6" lifts to
a minimum of 95% standard proctor density for
well graded material. Roller gross vehicles are
not to exceed 12,000 lbs. and dynamic force not
to exceed 20,000 lbs.
[B] Embedment
Stone
No equipment is allowed on bare
chambers. Use excavator or stone
conveyor positioned off bed to
evenly place the backfill around
and on top of all of the chambers.
No compaction required. No compaction required
[A] Bedding Stone
Placement with a variety of
equipment is acceptable to
provide a stable, level base.
Placed in 9" lifts and compacted with a
vibratory roller. Placed in 6" lifts and compacted with a vibratory
roller.