HomeMy WebLinkAboutR-383913DESIGN NOTES:
Reference. City of Renton. Kennvda|e Vua Point Construction P|onm, January 27, 2015
GooReaources, LLC. Geotechnical Infiltration Letter, June 3, 2014
Springhill, LLC, Kennvda|e Vue Point, January 28, 2015
The following design assumptions were used:
|n1arno| angle of friction for reinforced soil = 32 degrees (assumed for grid sizing)
Unit weight ofreinforced soil = 125 pof
Maximum wall height = 10.0 feet
Batter of vva|| = 1 H : 24V
Surcharge = Traffic Surcharge
TECHNICAL SPECIFICATIONS FOR MECHANICALLY STABILIZED LOCK & LOAD
RETAINING WALLS
GENERAL:
A. The work involves the supply and installation of soil reinforced retaining vva||m. The
work will |no|uda, but is not |irni1od to:
A-1 excavation to the grades shown on the civil drawings
A'2 supply and installation ofAeogrid reinforcement
A-3 supply and installation of drainage fill and piping
A'4 supply and installation of segmental StoneTerra Blocks
A-5 supply and installation of retained and reinforced soil fill
B. The vvo||s shall be installed on undisturbed Native Soils approved by geohaohnoia|
engineer.
MATERIALS
A. Geogrid - See Geogrid Schedule.
B. Drainage Fill ' Drainage Fill placed around and above the perforated drainage pipe
shall consist of 1-1/4 inch Clean Rook (no fines).
C. Reinforced Backfill ' Fill material shall consist of a granular material with fines not
exceeding 15 pen:ent, unless approved by the Geotechnical Emginoer.
D. Leveling Pod - Leveling Pad rneteha| shall consist of 5/8 inch Crushed Rook material.
EXECUTION
A. Contractor shall excavate to the lines and grades shown on the construction drawings,
The Geotechnical Engineer should observe the excavation prior to the placement of
the leveling nnoierie| or fill soils.
B. Over -excavation of deleterious soils shall be replaced with suitable granular material
and compacted to 95% of ASTM [l-1557 (Modified Proctor).
C. The first course of wall materials (StonaTerra) shall be placed on the Leveling Pad and
the alignment and level checked.
D. VVa|| materials shall be placed with the tops level and parallel tothe wall face.
E. Geogrid shall be oriented with the highest strength axis perpendicular to the vva||
alignment.
F Geogrid reinforcement shall be placed at the levels and to the lengths shown on the
drawings,
G. The geoghd shall be laid horizontally in the direction perpendicular to the face of the
retaining vva||. The geogrid shall be pulled taut, free of vvrinh|oa and anchored prior to
backfill placement on the geogrid.
H. The geoghd reinforcement shall be continuous throughout their embedment lengths.
Spliced connection between shorter pieces of Qeogrid is not permitted.
|. The drainage pipe discharge points ahe|| be connected to approved discharge.
J. Reinforced and Retained Backfill shall be p|aoed, apnsed and compacted in such a
manner that minimizes the development of slack in the googrid.
K. Reinforced and Retained Backfill shall be placed and compacted in lifts not to
exceed 8 inches where hand compaction equipment is used and not more than 12 inches
where heavy compaction equipment is used. Hand operated compaction equipment
(700 lbs. to 1,000 lbs.) Vibratory Plate ohe|| be used to compact interface of drainage
fill and reinforced backfill within 38" zone behind concrete facing.
L. Reinforced and Retained Backfill shall be compacted to 8596 of the maximum density
as determined by ASTM [)-1557-B1 (Modified Proctor) or equivalent. The moisture
content of the backfill material prior to and during compaction shall be uniformly
distributed throughout each layer and shall be within 2 percentage points of the
optimum moisture content.
M. Hand -operated equipment (700 lbs. to 1.000 lbs. Vibratory Plate) shall only be used within
38 inches of the back face of the concrete facing.
N. Tracked construction equipment shall not be operated directly upon the Qeogrid
reinforcement. A rninirnurn fill thickness of B inches is required prior to operation of
tracked vehicles over the geogrid.
C}. Rubber tired equipment may pass over the geogrid reinforcement at m|ovv speeds
less than 5 mph. Sudden braking and sharp turning aho|| be avoided.
P. At the end of each day of operadon, the contractor shall slope the last lift of
reinforced backfill away from the vve|| units to direct runoff away from the vva|| face.
The contractor shall not o||ovv surface runoff from adjacent areas to enter the vva||
construction site.
Guardrail
(As Required)
( By Others)
3'Min.
Guardrail
Traffic Surcharge
CN n*.
ofth- � ...... ....... .......
..................
10" Diameter Son.o.W.be
..................
4' Max. .....
Drainage Fill (No Fines)
(By Others)
Sleeve (,See Guardrail S11,61,01ve
StoneTerra
Detail and''Notes),
CM
Traffic Surcharge
Dense Native Cut
( o Be Confirmed By
Note: Toe cover should
Geotechnical Engineer)
be 36" for steeply sloped
toe conditions.
4" Crushed Rock 4" Perforated Rigid
eveling Pad (5/8" Minus) Drain Pipe
Reinforced Backfill
x� FTa
GRAVITYWALL ��
MJA%'yF%M
�(Where
TYPICAL WALL
Cut GnoghdNeatly Guardrail
AmundSonotubn post
`
40TE:
3onotumsu,beplaced concurrently
vuhwall construction, asneeded su
:uarumi| post locations, Once wall
xonstr ctionisoomp|ete.gumnJrai|oehaU
,oplaced and Sonmubeoshall befilled
vithgrout. Googhdshall becut tofit
,eadyaround Sonotubea^asnecessary.
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SIDE
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1211 24"
2411
FRONT VIEW
STONETERRA BLOCK DETAILS
Guardrail
(As Required)
10" Diameter Son.o.W.be
op `
(By Others)
Sleeve (,See Guardrail S11,61,01ve
Detail and''Notes),
CM
Traffic Surcharge
Bench Block
Reinforced Backfill
StoneTerra
Modular Blocks
0
24" (Typical)
0.0
'Geogrid Length - Reinforced Zone
Layer I
Drainage Fill (No Fines"
00
Note. Toe cover should
be 36" for steeply sloped
4" Perforated Rigid
toe conditions,
4" Crushed Rock
Drain Pipe
Leveling Pad (5/8" Minus)
to be Located at Base
Geotechnical Engineer to
of Keyway
Confirm SubgnsdePrior bo
NOTE: Geotechnical Engineer shall
Rock Placement
evaluate the need for Supplement
Drainage behind the Reinforcement
Zone during the. Construction.
TYPICAL WALL
Cut GnoghdNeatly Guardrail
AmundSonotubn post
`
40TE:
3onotumsu,beplaced concurrently
vuhwall construction, asneeded su
:uarumi| post locations, Once wall
xonstr ctionisoomp|ete.gumnJrai|oehaU
,oplaced and Sonmubeoshall befilled
vithgrout. Googhdshall becut tofit
,eadyaround Sonotubea^asnecessary.
24
^=.
24^
� :T61 a IM
4811
10 ]''' al
| 24^ |
SIDE
VIEW
1211 24"
2411
FRONT VIEW
STONETERRA BLOCK DETAILS
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