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Sheet No.Proj. No.Drwn. ByChecked ByDateDateRevisionsand Environmental SciencesLock & Load Wall Design and NotesRESERVE AT TIFFANY PARKRenton, Washington363310/29/2014KDHKDHLK1
DESIGN NOTES
Reference: Barghausen Consulting Engineers, Inc., Site Plans, Dated October 8, 2014
Associated Earth Sciences, Inc., Subsurface Exploration, Geologic Hazard, and
Limited Geotechnical Engineering Report, Dated September 28, 2012
The following design assumptions were used:
Internal angle of friction for reinforced soil = 32 degrees (design only - see Materials
Note “F”)
Unit weight of reinforced soil = 125 pcf
Maximum wall height = 18.67 feet
Batter of wall = 1H : 10V
Surcharges (Where Applicable) = 3000 plf Footing Strip Load
250 psf Uniform Soil Load
100 psf Traffic Live Load
TECHNICAL SPECIFICATIONS FOR MECHANICALLY STABILIZED LOCK & LOAD
RETAINING WALLS
GENERAL
A. The work involves the supply and installation of soil-reinforced retaining walls. The
Concrete Panels and Counterforts will consist of Lock & Load Stone. Counterfort and
Geogrid are the types of soil reinforcement. The work will include, but is not limited to:
A-1 excavation to the grades shown on the civil drawings
A-2 supply and installation of geogrid reinforcement
A-3 supply and installation of drainage fill and piping
A-4 supply and installation of segmental Lock & Load Stones
A-5 supply and installation of retained and reinforced soil fill
B. The walls shall be installed on undisturbed Native Soils or Structural Fill as
appropriate.
MATERIALS
A. Concrete Panels and Counterforts are locked together to form a “Stone”. The
retaining walls have been designed on the basis of Lock & Load Retaining Wall
“Stones”. “Stones” are to be purchased from a licensed Lock & Load manufacturer.
The Lock & Load trademark on each pallet identifies Lock & Load products.
B. Information on the purchase of Lock & Load products can be obtained through:
Lock & Load Retaining Walls Ltd.
Tel. (877) 901-9990
Website: www.lock-load.com
C. Geogrid - Structural geogrid reinforcement shall consist of Synteen SF-55 or Synteen
SF-80, or an alternative as approved by the Geotechncial Engineer with a minimum
long-term design strength of 2,740 lbs/ft and 4,137 lbs/ft, respectively.
D. Drainage Fill - Drainage Fill placed around and above the perforated drainage pipe
shall consist of round or angular 3/4 inch to 1 inch “clean” rock.
E. Face Gravel - 3/4 inch clean crushed rock or approved equivalent by the Geotechnical
Engineer.
F. Reinforced and Retained Backfill - Suitable granular material approved by the
Geotechnical Engineer. Fines shall not exceed 25 percent.
G. Leveling Course - The Leveling Course shall consist of angular, crushed aggregate with
maximum size of 3/4 inch. The Leveling Course Fill may be single size or may be well-
graded containing a maximum of 5% passing the #200 sieve.
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 material or fill soils.
B. Over-excavation of deleterious soils or rock shall be replaced with material meeting
the specifications described in Materials Section “F” above and compacted to 95%
of ASTM D1557 (Modified Proctor) within 2% of optimum moisture content of the soil.
C. The first course of concrete Lock & Load “Stones” shall be placed on the Leveling Course
and the alignment and level shall be checked.
D. “Stones” shall be placed with the top of the panel level and parallel to the wall face.
The Counterfort Base shall be installed horizontal and perpendicular to the face of the
retaining wall.
E. Geogrid shall be oriented with the highest strength axis perpendicular to the wall
alignment.
F. Geogrid reinforcement shall be placed at the levels and to the lengths shown on the
drawings beginning at the back of the Lock & Load Panels.
G. The geogrid shall be laid horizontally in the direction perpendicular to the face of the
retaining wall. The geogrid shall be pulled taut, free of wrinkles, and anchored prior to
backfill placement on the geogrid.
H. The geogrid reinforcement shall be continuous throughout respective embedment lengths.
Spliced connection between shorter pieces of geogrid is not permitted.
I. The drainage pipe discharge points shall be connected to approved discharge.
J. Reinforced and Retained Backfill shall be placed, spread, and compacted in such a
manner that minimizes the development of slack in the geogrid.
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. Compaction should occur over the tail of the
Counterfort prior to areas away from the retaining wall. Hand-operated vibratory plate
compaction equipment (700 lbs. to 1,000 lbs.) shall be used to compact face gravel at
wall face.
L. Reinforced and Retained Backfill shall be compacted to 95% of the maximum density
as determined by ASTM D1557 (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 compaction equipment (700 lbs. to 1,000 lbs.) shall be used within
26 inches of the front face of the concrete facing.
N. Tracked construction equipment shall not be operated directly upon the geogrid
reinforcement. A minimum fill thickness of 6 inches is required prior to operation of
tracked vehicles over the geogrid.
O. Rubber tired equipment may pass over the geogrid reinforcement at speeds
less than 10 mph. Sudden braking and sharp turning shall be avoided.
P. At the end of each day of operation, the contractor shall slope the last lift of
reinforced backfill away from the wall units to direct runoff away from the wall face.
The contractor shall not allow surface runoff from adjacent areas to enter the wall
construction site.
NOTES
1. Wall alignment and heights to be established by contractor / surveyor.
2. Geotechnical Engineer to confirm Keyway stability,support characteristics,
and overall global stability prior to construction.
3. Fences will be installed on top of all walls. Such fencing may include
temporary safety fencing (chain link or equal) until permanent fences are
installed. Permanent fences shall be no greater than six feet in height
above the top of the wall and may be either solid wood, vinyl-clad chain link,
or such other type as determined by the owner.
GEOGRID SCHEDULE
Wall*
Height
(feet)
Layers
12345678910
4.00
5.33
6.67
8.00
9.33
10.67
12.00
13.33
14.67
16.00
17.33
18.67
A---------
AA--------
AA--------
AAA-------
AAA-------
AAAA------
BAAA------
BAAAA-----
BAAAA-----
BBAAAA----
BBAAAA----
BBAAAAA- - -
GEOGRID:A = Synteen SF-55
B = Synteen SF-80
Geogrid
Length
(feet)
4.00
5.00
6.00
7.00
8.00
9.00
10.00
11.00
12.00
13.00
14.00
15.00
#of
Panels
3
4
5
6
7
8
9
10
11
12
13
14
22"
16"
32"
Outline of
Connecting Loop
FRONT VIEW
6.75"
TOP VIEW
Connecting
Loop
6.75"
4.5"
1.6"
16"
1.25"
3.75"
SIDE VIEW
Poly Fiber Reinforced
1 1/2" fiber (4 lbs./yard)
6,000 psi concrete
Casting Tolerance
NOTES:
1. Installation to be completed in accordance with manufacturer’s
specifications.
2. Do not scale from drawings.
LOCK&LOADPANEL
NOT - TO - SCALE
LLOOCCKK++LLOOAA DD
LLOOCCKK++LLOOAADD
TOP VIEW
SIDE VIEWFRONT
FRONTBACKBACKNOTES:
1. Installation to be completed in accordance with manufacturer’s
specifications.
2. Do not scale from drawings.
LOCK&LOADCOUNTERFORT
NOT - TO - SCALE
REINFORCEMENT BAR
BENDING DETAIL
PICTORIAL VIEW
6"
27"
3"
7.65"
4"
27"
6.75"
20.4"
90
80
90
1.6"
4.4"
Finish Grade
at Wall Face
16" (Min.)
Wall Height
H = 18.67'
(Max.)
TYPICAL WALL SECTION
NOT - TO - SCALE
2.67'
(typ.)
4" Perforated Drainpipe
Surround with 1 cf of
Washed Rock per lineal foot
of Pipe
Reinforced
Soil
Retained
Soils
Retained
Soils
4" - 6" Crushed Rock
Leveling Course
Geogrid Reinforcement
(See Geogrid Schedule)
18" of Well-Compacted
3/4" Clean Crushed Rock
Geogrid Layer 1
Geogrid Layer 2
Geogrid Layer 3
Geogrid Layer 4 (etc.)
6' - 0"
(Max.)
Fence
(By Others)
2
1
24" (Min.)*
NOTE: Wall Toe cover shall be 24" (Min.)
for 2H:1V Sloping Condition in Front of Wall
*
NOTE: Geotechnical Engineer shall
evaluate the need for Supplementary
Drainage behind the Reinforcement
Zone during Construction.
5' (Min.)
Footing Setback
Drainage Blanket
(As Necessary per
Geotechnical Engineer)
1
10
Reinforced
Soil
Mirafi 140N
Filter Fabric
(If Necessary per
Geotechnical Engineer)
Traffic Surcharge
(Where Applicable)
Uniform Soil Surcharge
(Where Applicable)
2H:1V (Max.)
Slope Behind Wall
2
15' (Min.)
Footing Setback
Traffic Surcharge
(Where Applicable)
Uniform Soil Surcharge
(Where Applicable)
2H:1V (Max.)
Slope Behind Wall
Finish Grade
at Wall Face 16" (Min.)
Wall Height
H=6'
(Max.)
GRAVITY WALL CONDITION
H = 6' (MAX.)
NOT - TO - SCALE
4" Perforated Drainpipe
Surround with 1 cf of
Washed Rock per lineal foot
of Pipe
Retained
Soils
4" Crushed Rock
Leveling Course
18" of Well-Compacted
3/4" Clean Crushed Rock
6' - 0"
Max.
Fence
(By Others)
NOTE: Geotechnical Engineer shall
evaluate the need for Supplementary
Drainage behind the Reinforcement
Zone during Construction.
Drainage Blanket
(As Necessary per
Geotechnical Engineer)
Structural
Fill or
Competent Cut
1
10
PR13007339
B19005144
RECEIVED
09/24/2019 lwalker
BUILDING DIVISION
REVIEWED
By: Alan Findlay, P.E.
Date: 10/08/2019
APPROVED
BUILDING DIVISION
THIS SET OF APPROVED PLANS MUST BE ON THE JOB AT ALL
TIMES DURING CONSTRUCTION. THIS BUILDING IS NOT TO BE
OCCUPIED UNTIL AFTER FINAL INSPECTION BY THE RENTON
BUILDING DIVISION AND RECEIPT OF CERTIFICATE OF
OCCUPANCY.
APPROVAL SHALL NOT BE CONSTRUED AS THE AUTHORITY TO
VIOLATE OR CANCEL ANY PROVISIONS OF CODES, ORDINANCES,
OR OTHER REGULATIONS ENFORCED BY THIS CITY.
DATE: 10/09/2019