Supply of Prefabricated Structures
Design of Walls and Bridges

Precast Concrete Arch Structure

Arch culverts offer both the open-area benefits of a rectangular box culvert as well as the structural load-carrying capacity of an arch structure. The arch shape provides the most efficient and cost-effective structural cross section, while the vertical side walls of the arch-box shape result in greater open area for increased hydraulic clearance. SPECS’ three-sided structure can be set on shallow or pile-supported strip foundations to avoid disturbing wetlands and streams. With a variety of span and rise combinations from 12 feet to 52 feet, the SPECS three-sided arch structures offer speed of construction, environmental avoidance, cost savings compared to conventional box or bridge construction and minimized long-term maintenance.

Corrugated Steel Plate Structures

• Skewed ends, radius or tangent channel alignments
• AREMA, FAA, and AASHTO LRFD design codes 
• Lateral pipe penetration or inspection portals, full-section skylights or maintenance hatches
• Tall vertical clearances for tunnels
• Live Loads including Cooper E-80, Permit loading, HL-93, airport as well as extreme Dead Loads from high-fill configurations and seismic loading

Precast Box Culverts

SPECS has 3- and 4-sided box culvert options that range from 4 feet to 40 feet in span. The 4-sided structures can be made in two pieces to maximize the lay length and minimize the number of joints, as well as offering up to a 16-foot rise.