HomeMy WebLinkAboutRevised W1 & W4 Sheets.pdfEarthSolutionsNWLLCEarth Solutions NWLLCGeotechnical Engineering,Construction Monitoring
Sheet No.Proj. No.Drwn. ByChecked ByDateDateRevisionsand Environmental SciencesStoneTerra Wall Designs and NotesAVANARIDGERenton, Washington4147.0101/31/2017CAMKDHW1
DESIGN NOTES
Reference: D.R. Strong Consulting Engineers, Inc., Grading Plan, dated January 2017
The following design assumptions were used:
Internal angle of friction for reinforced soil = 32 degrees (design only)
Unit weight of reinforced soil = 125 pcf
Maximum wall height = 6.0 feet
Batter of wall = 1H : 24V or 1H : 6V (See Details)
Surcharges (Where Applicable) = 250 psf Uniform Slope Surcharge
TECHNICAL SPECIFICATIONS FOR GRAVITY STONETERRARETAINING WALLS
GENERAL
A. The walls shall be installed on undisturbed Native Soil or Structural Fill, as appropriate.
MATERIALS
A. Drainage Fill - Drainage Fill placed around and above the perforated drainage pipe
shall consist of round or angular, 2-inch “Clean” Crushed Rock.
B. Reinforced and Retained Backfill - Suitable granular material approved by the
Geotechnical Engineer. Fines shall not exceed 25 percent.
C. 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 No. 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 “B” above and compacted to 95% of
ASTM D1557 (Modified Proctor) within 2% of the optimum moisture content of the soil.
C. The first course of StoneTerra Blocks shall be placed on the Leveling Course and
the alignment and level shall be checked.
D. Blocks shall be placed with the tops level and parallel to the wall face.
E. The drainage pipe discharge points shall be connected to an approved discharge system,
where applicable.
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. In lieu of 4" Diameter Perforated PVC Drain Pipe
installation, drainage through the Wall Face may
be considered, upon approval by the Geotechnical
Engineer during construction.
StoneTerra
Modular Blocks
Wall Height
H = 5' (Max.)
18"
(Min.)
See Note 3
GRAVITY WALL DETAIL
EXPOSED H = 5' (MAX.)
NOT - TO - SCALE
StoneTerra
Bench Block
12"
(Min.)
Retained Soil
or Structural Fill
1
24
*18" (Min.)
*NOTE: Wall Toe Cover shall be 18" (Min.)
for 2H : 1V sloping condition in front of wall.
Leveling Course
4"- 6" Crushed Rock
Finish Grade
At Wall Face
Drainage Fill
2" Clean Crushed Rock
2
1
2H : 1V (Max.)
Slope Behind Wall
StoneTerra
Modular Blocks
Wall Height
H = 6' (Max.)
Drainage Fill
2" Clean Crushed Rock
See Note 3
Leveling Course
4"- 6" Crushed Rock
12"
(Min.)
Retained Soil
or Structural Fill
1
6
2H:1V (Max.)
Slope Behind Wall
2
112"
(Min.)
Area in front of Wall Face must be “overbuilt”
with Structural Fill, mechanically compacted,
and re-cut into for Gravity Wall construction
GRAVITY WALL DETAIL
EXPOSED H = 6' (MAX.)
NOT - TO - SCALE
48"
24"
24"
BOTTOM VIEW
TOP VIEW
48"
24"
24"
24"
13"
9"
24"
24"
SIDE VIEW
48"
24"12"
24"
FRONT VIEW
STONETERRABLOCK DETAILS
NOT - TO - SCALE
01/31/2017
EarthSolutionsNWLLCEarth Solutions NWLLCGeotechnical Engineering,Construction Monitoring
Sheet No.Proj. No.Drwn. ByChecked ByDateDateRevisionsand Environmental SciencesKeystone Wall Detail and NotesAVANARIDGERenton, Washington4147.0101/31/2017MRSKDHW404/06/2017Top Slope Condition
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. In lieu of 4" Diameter Perforated PVC Drain Pipe
installation, drainage through the Wall Face may
be considered, upon approval by the Geotechnical
Engineer during construction.
Keystone
Standard Block
Unit Drainage Fill
1" Clean
Crushed Rock
See Note 3
8"
4" Leveling Pad
(Crushed Rock)
12" Min.
Wall Height
H = 4.67' (Max.)
Finish Grade
Competent
Cut
4"
GRAVITY WALL DETAIL
NOT - TO - SCALE
1
12
GENERAL
A. Work shall consist of furnishing and construction of a Keystone Block Retaining Wall
System or equivalent in accordance with these specifications and in reasonably close
conformity with the lines, grades, and dimensions shown on the plans.
B. Work includes preparing foundation soil, furnishing and installing leveling pads, drainage
fill, and backfill to the lines and grades shown on the construction drawings.
C. Work includes furnishing and installing geogrid soil reinforcement of the type, size,
location, and lengths designated on the construction drawings.
SUBMITTALS
A. Contractor shall submit a stamped design with calculations prior to start of work for
approval by the engineer.
B. Contractor shall submit certifications with each delivery or shipment of block.
QUALITYASSURANCE
A. Owner shall provide soil testing and quality assurance inspection during earthwork and
wall construction operations. Owner’s quality assurance program does not relieve the
contractor of responsibility for wall performance.
DELIVERY, STORAGE AND HANDLING
A. Contractor shall check all materials upon delivery to ensure that the proper type, grade,
color, and certification has been received.
B. Contractor shall protect all materials from damage due to jobsite conditions and in
accordance with the recommendations of the manufacturer. Damaged materials shall
not be incorporated into the work.
PRODUCTS
DEFINITIONS
A. Modular Unit: a concrete retaining wall element, machine-made from Portland Cement,
water, and aggregates.
B. Unit Drainage Fill: drainage aggregate which is placed within and immediately behind
the modular concrete units.
MODULAR CONCRETE RETAINING WALL UNITS
A. Modular Concrete Units shall conform to the following architectural requirements:
Face Color: concrete gray
Face Finish: tri-plane face configuration
Bond Configuration: running with bonds nominally located at midpoint vertically adjacent
units, in both straight and curved alignments.
B. Modular concrete materials shall conform to the requirements of ASTM C1372
(Standard Specifications for Segmental Retaining Wall Units).
C. Modular concrete units shall conform to the following structural and geometric
requirements:
Compressive Strength: 4000 psi minimum
Absorption: 8% maximum (6% in northwestern states) for standard weight aggregates
Dimensional Tolerances: ±1/8" from nominal unit dimensions not including rough split
face; ±1/16" unit height for the top and bottom planes
Unit Size: 100 lb/unit minimum for standard weight aggregates
Inter-unit Shear Strength: 1500 plf minimum at 2 psi normal pressure
D. Modular concrete units shall conform to the following constructability requirements:
Alignment and Grid Positioning Mechanism: fiberglass pins, two per unit minimum
Horizontal Spacing between Erected Units: 1/2-inch maximum
SHEAR CONNECTORS
A. Shear connectors shall be 1/2-inch-diameter, thermoset isopthalic polyester,
resin-pultruded fiberglass reinforcement rods or equivalent to provide connection
between vertically and horizontally adjacent units. Strength of shear connectors
between vertical adjacent units shall be applicable over a design temperature of 10
degrees F to ±100 degrees F.
BASE LEVELING PAD MATERIAL
A. Material shall consist of a compacted crushed rock base or non-reinforced concrete
at the option of the contractor.
DRAINAGE FILL
A. Drainage Fill shall consist of 1-inch “clean” crushed rock meeting the following
gradation tested in accordance with ASTM D422:
Sieve Size Percent Passing
1 inch 100
3/4 inch 75 - 100
No. 4 0 - 10
No. 50 0 - 5
B. Drainage Fill shall be placed within cores of, between, and behind units a minimum
distance of 12 inches as shown on the plans.
DRAINAGE PIPE
A. If required, the drainage pipe shall be perforated pipe manufactured in accordance
with ASTM D3034.
EXECUTION
EXCAVATION
A. Contractor shall excavate to the lines and grades shown on the construction drawings.
The Geotechnical Engineer shall observe the excavation and provide approval prior to
placement of Leveling Pad material. The foundation area shall be proofrolled
as recommended by the Geotechnical Engineer.
BASE LEVELING PAD
A. Leveling Pad material shall be placed to the lines and grades shown on the construction
drawings, to a minimum thickness of 4 inches and extended laterally a minimum of
6 inches in front of, and behind, the modular wall unit.
B. Soil Leveling Pad material shall be compacted until firm and unyielding, as confirmed by
the Geotechnical Engineer at the time of construction.
C. Leveling Pad shall be prepared to ensure full contact to the base surface of the concrete
units.
MODULAR UNIT INSTALLATION
A. The first course of units shall be placed on the leveling pad at the appropriate line and
grade. Alignment and level shall be checked in all directions to ensure that all units are
in full contact with the base and properly seated.
B. Place the front units side-by-side. Layout of corners and curves shall be in accordance
with the recommendations of the manufacturer.
C. Install shear connectors to achieve wall batter per approved plans.
D. Maximum stacked vertical height of wall units, prior to unit drainage fill and backfill
placement and compaction, shall not exceed three courses.
CAP INSTALLATION
A. Cap units shall be glued to underlying units with polyurenthane adhesive.
AS-BUILT CONSTRUCTION TOLERANCES
A. Vertical Alignment: ±1.5 inches over any 10-foot distance
B. Wall Batter: within 2 degrees of design batter
C. Horizontal Alignment: ±1.5 inches over any 10-foot distance
Corners, Bends, Curves: ±1 foot to theoretical location
D. Horizontal Gap between Erected Units: 1/2-inch maximum
E. Installation Location: with 2 inches of staked base location
FIELD QUALITY CONTROL
A. The wall footings shall be observed by the Geotechnical Engineer on a full-time
basis. Testing of the compacted backfill shall be performed by the owner at least
once every two lifts of backfill placement and compaction.
B. At a minimum, quality assurance should include foundation soil inspection, soil and
backfill testing, verification of design parameters, and observation of construction for
general compliance with design drawings and specifications.
04/06/2017