S T R U C T U R A L W A L L | K E Y S T O N E S T A N D A R D ™S T R U C T U R A L W A L L | K E Y S T E E L ® ( K E Y S Y S T E M ™ I )

The KeySteel SQ FT MSE Wall System is a high performance retaining wall system designed specifically for use in transportation and tall walls with high load applications. This system has been used extensively for structures supporting railroads, multi-story buildings, bridge approach and abutments, and mining applications. The KeySteel SQ FT MSE Wall System has been evaluated by HITEC (CERF report #40478) and found to be in accordance with the high standards of the AASHTO bridge specification manual. The system utilizes the Keystone KeySteel SQ FT unit and inextensible KeyStrip soil reinforcement. This system is also known as KeySystem I in some markets.

Unit Dimensions: 8"h x 18"w x 12"d (200mm x 455mm x 305 mm)

Unit Weights: 90 - 95 lbs (41 - 43 kg)

Units/sq.ft.: 1

Pin Specifications: ½" x 5¼" Fiberglass Pins (12.7mm x 134mm) 9⁄16" x 8" Steel Pins (14.3mm x 200mm)

Tri-plane

Straight Split

Ideal Applications

• River & flood walls

• Bridge abutments

• Rail transporations

• Roadway support

• Headwalls & wingwalls

Maximum Versatility and Performance

• Allows for various positive connections with reinforcement to build engineered walls in excess of 60 feet (18m) tall.

• Increases vertical drainage through face units.

• Higher unit-to-unit shear resistance.

• Open cores allow for gravel interlock across block interfaces.

Cost-Effective Results

• Comparable cost-effectiveness of segmental retaining walls (SRW) with the strength and reliability of mechanically stabilized earth (MSE) walls.

• Wall deflections of KeySteel SQ. FT. walls are 3x less than geosynthetic reinforced walls.

• Design life of 75 years for typical structures, and up to 100 years for critical structures.

FEATURES & BENEFITS

Note: Unit color, dimensions, weight & availability varies by manufacturer.

S T R U C T U R A L W A L L | K E Y S T E E L ® ( K E Y S Y S T E M ™ I )

See drainage notes

Drainage Notes:When site conditions require, wrap drainagetile in ¾"(19mm) aggregate and filter fabric withdrainage composite or aggregate back drainsystem, as directed by geotechnical engineer.

Existing grade(varies)

Existing Ground Approximate limits of excavation

EXCAVATION

STEP 1

INSTALLATION INSTRUCTIONS

W = Unit depthW +12" (305mm)

6" (152mm) Unreinforced concrete leveling pad

W6"(152mm)

6"(152mm)

Overlap steppedbase course 1½ unitson sloping grade

8" or 16"(203mm or 406mm) step

Leveling pad

PLACE LEVELING PAD

Front face of unit

KeySteel SQ FT Unit

Align units alongpin holes or back of unit

Pin hole

Set and align the base course

Drainage pipe (as required)

PLACE AND ALIGN BASE COURSE / DRAINAGE

Place galvanized or fiberglasspins in pin holes for the nextcourse above (Typ)

Fill unit voids andarea between unitswith drainage fill

Compacted wall backfillzone (each course)

Fill unit voids and area between units with drainage fill

Unit drainage fill(each course)

24" (610mm) unit drainage fill zone(¾"(19mm) crushed rock or stone)

PLACE PINS, UNIT/ DRAINAGE MATERIAL, COMPACTED BACKFILL

Finished Grade

Passive soil wedgebackfill

Place the next coursealigning the kidney holeswith the pins in the coursebelow, then slide forward to contact pin with kidney

Sweep off top of unit prior to placing next course

12"

COREFILL AND BACKFILL

(305mm)

Where the design requires, place the KeyStrip reinforcementover galvanized steel connector pins and on level and uniform compacted backfill

KeyStrip reinforcementon level compacted backfill

12"

PLACE REINFORCEMENT, AS REQUIRED

(305mm)

Alternate construction courses until all KeySteel unitsare installed

ALTERNATE CONSTRUCTION COURSES

KeyStrip reinforcement

Place finished grade and ladscaping

8"(203mm)min. low permeable soilFinished grade

KEYSTEEL FINISHED GRADE

STEP 2 STEP 3

STEP 4 STEP 5 STEP 6

STEP 7 STEP 8

©2018 Keystone Retaining Wall Systems LLC

Keystone Retaining Wall Systems LLC 4444 West 78th Street • Minneapolis, MN 55435

(952) 897-1040 • www.keystonewalls.com