augmented by high frequency vertical impact energy.
Depths normally range from about 10 to 20 feet,
depending on design requirements. This displacement
process helps to eliminate spoils.
2. Once driven to design depth, the confining sleeve
remains in place. Aggregate (clear stone or clean sand)
is then placed and densified inside the confining HDPE
sleeve. Compaction is achieved through static down
force and dynamic vertical ramming from the hammer
and mandrel. The process densifies aggregate vertically
and forces the aggregate and confining sleeve laterally,
expanding into the soft matrix soil. This results in
lateral stress increase that, combined with the high
stiffness element, provides excellent settlement control
with superior strength and stiffness in soft clay and
organic soils.
3. Following installation, RAP elements: support shallow
foundations, floor slabs and mats; reduce liquefaction
potential and improve stability support of embankments,
walls and tank pads. The applied stresses are attracted
to the stiff RAP elements, resulting in engineered
settlement control.
RAP solutions are designed to provide total land differential
settlement control and increase bearing support to meet
and exceed project requirements in some of the most challenging
©2020 Simpson Strong-Tie Company Inc. RPSUW16
TECHNICAL
Applications
The Armorpact system offers support for
virtually any soil type and groundwater condition
across many applications, including:
• Industrial facilities
• Storage tanks
• Liquefaction mitigation
• Mechanically stabilized earth walls/
embankment support
• Slope stabilization
• Transportation
• Wind turbines
• Lateral load resistance
Mark Tigchelaar is president and founder of GeoSolv Design/
Build Inc. Tigchelaar is a licensed engineer in both Ontario and
Alberta, chair of the Industry Advisory Board of York University
and the past chair of the Canadian Geotechnical Society-
Southern Ontario section. For inquiries about this article or
ground improvement, reach Tigchelaar at mark@geosolv.ca.
Don’t replace.
Repair in place.
soft soil conditions.
Watch How to Install FX-70® Jackets in Water at strongtie.com/videolibrary
and subscribe to our YouTube Channel at youtube.com/strongtie.
With 40+ years of proven performance,
our FX-70® Structural Repair and
Protection System repairs concrete,
steel and wood piles in service
without dewatering while protecting
against further deterioration. From
custom-manufactured fiberglass
jackets to underwater epoxies
and cementitious grouts, we have
cost-effective, practical, long-term solutions for
your repair projects.
Since 1956, Simpson Strong-Tie has
brought innovative solutions to customers’
construction challenges. To learn more
about our products that repair, protect and
strengthen, visit go.strongtie.com/rps or call
us at (800) 999-5099.
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