In May of 2011, Cascade Industries Northwest installed 3,000 square feet of Bridge Preservation™ BDM bridge deck waterproofing and Bridge Preservation’s patented “T-Cup” joint system on bridges for the Utah Transit Authority’s Frontrunner Project.
The UTA approached Bridge Preservation because the longitudinal joints of their precast box beam girder bridges were leaking. They had attempted to use typical joint systems, but they had failed because of the vertical deflections present on the bridges during normal use. They required a bridge deck waterproofing solution that would seal the joint, fit into the 1/4” clearance between the girders, and accommodate the free-floating tabbed protection plates present on the bridges. To complicate matters, the joints were slightly wider than 1/4”. Bridge Preservation designed the “T-Cup” joint system, which was narrow enough to fit into the small clearance area, but could also accept the centering tabs.
After surface preparation and primer application, the joints were positioned and installed using Bridge Preservation™ Joint Adhesive. Bridge Deck Membrane bridge deck waterproofing waterproofing was then applied to the bridge deck. The tabbed protection plates were then placed in position and a bond breaker was applied over them. Another layer of Bridge Deck Membrane bridge deck waterproofing was applied, providing a “belt and suspenders” waterproofing solution at the joints.
Utah Transit Authority
Provo to Salt Lake FrontRunner Project
45,000 SF; 14 Bridges