Helical Anchors for Bridge Abutments
The Winslow Geo Anchor was recently used for the foundation of a 70-foot bridge
(H20-44 loading) in Walnut Creek, California.
The span crosses a large stream, enabling the development of two prime hillside
lots previously restricted due to the inability of transporting materials from one
side to the other. 14 anchors were used in the foundation -- seven on each side
-- instead of 20 piers initially architected. The structure will easily meet the
37-ton load (enough to support a county fire engine) requirement, as each anchor
has been tested at 50 tons capability.
Jim Winslow, director of deep foundations at Best Base noted, “Not only did our
anchors save a considerable amount of money in materials because we used significantly
less concrete and no cages/caissons, but the anchors were installed in one day vs.
the one week estimated for the concrete piers -- saving a huge amount in additional
Rick Kolby, principal of the group developing the project, Tice Valley Partners,
said, “In addition to the nearly 50% we saved in materials and labor, the Winslow
Geo Anchor had no impact on the stream itself. It was easily installed, is environmentally
friendly and extremely structurally sound -- factors made the code and review process
easy. In essence, we were able to provide a much better look and feel to the entire
area, and that will be a huge benefit as the years go by and future households enjoy