AIL’s innovative Geotextile Reinforced Soil (GRS) technology puts the dirt to work in soil bridge solutions.
The AIL GRS technology is a patented buried bridge system originally developed for the forestry and resource industry sectors. It uses steel anchor rods to connect a Super•Cor structural plate arch to the backfill/geotextile composite and transfer the loads into the surrounding GRS mass.
How GRS technology works
GRS buried bridges are a soil-steel-bridge geotextile composite structure. Dead and live loads are supported by the reinforced soil, structure and natural or improved subgrade soils.
1. Anchor Rods – The soil arch structure is connected to the GRS soil mass composite with soil anchor rods. The anchor rods ensure the soil bridge structure maintains shape during backfilling.
2. GRS – Closely spaced geotextile between layers of compacted backfill act to confine the soil particles.
3. Boulder layer foundation – Used in lieu of conventional strip footings or pile foundations.
Fish and wildlife friendly
GRS buried bridges maintain the original streambed, reducing the impact on fish and wildlife. Where the streambed does not exist, streambed reconstruction is part of the soil-steel bridge design. Structures can be sized wider than the natural streambed to permit passage of other wildlife. Flexible headwall designs help to minimize the footprint of the soil arch.
Boulder foundation preparation eliminates concrete footings and, in many cases, pile foundations. Components ship on a single truck to be installed with conventional road building equipment and local labour in only a matter of days. Natural boulder foundations and backfill are typically sourced locally, reducing hauling costs and accelerating construction in regions with limited infrastructure.
AIL’s GRS solutions make very efficient soil bridge or soil arch solutions for resource road crossings, stream crossings and fish passages in remote locations and environmentally sensitive areas.
For more information, e-mail or call Phil Carroll at 1-604-818-1507.
AIL Branded Geotextiles are also available for our GRS applications
AIL Geotextiles are composed of high-tenacity polypropylene yarns woven into a network to retain their relative positions. AIL Geotextiles are inert to biological degradation and resistant to naturally-encountered chemicals, alkalis, and acids. We offer three increasing strengths of AIL Geotextiles to help you complete your GRS project. Download our Technical Data Sheets for more information or talk to one of our GRS experts.
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Structural Plate Bridges or Buried Metal Bridges offer many advantages over concrete equivalents and traditional site-built beam bridges.
Visit our Buried Metal Bridge Benefits page to learn more >>
8-page, full-colour brochure outlining GRS product, applications and specifications.Download
Download a PDF of our two largest pre-designed structures of Super•Cor Low Profile Arches; 20S Low Profile Arch and 28S Low Profile Arch.