Stepney Cross Road – Low Rise, Low Profile Arch Culvert with Cobble Faced GRS Wall … Turtle approved.

Challenge – An existing bridge over Fortune Creek in Spallumcheen, BC required replacement.  This agricultural setting included deep fine-textured soils and budget constraints did not allow for significant changes to the horizontal or vertical road alignment.

Solution – Landmark was retained to construct a timber pile supported, low profile arch culvert with minimal vertical fill. Low bearing capacity of the foundation soil required timber piles to support the precast footings.  The arch length allows for two way traffic.  Preassembly in an adjacent staging area provides for crane-lifting into place.  A cobble-faced GRS (Geosynthetic Reinforced Soil) wall, with multiple layers of geotextile retains the soil mass using local material.

Specs:

•   Arch Span – 11.0 m
•   Rise – 2.5 m
•   Arch Length – 12.9 m
•   Pile depth – 8-15 m (25-50′)
•   Design load – BCL 625

Another successful project done in collaboration with Terratech Consulting Ltd.