Precast Reinforced Concrete Box Culvert ( C - 1868 )

2026-11-03

1 . Manufacturer shall provide structural design for the Precast Box Culvert in accordance with the following criteria : a . Traffic Loading : AASHTO HL 93 b . Dead Loading : Depth of aggregate backfill of 5 to 7 feet c . Design Standard : ASTM C - 1577 - 17 : AASHTO - LRFD d . Inside dimensions of the culvert shall be 15 feet wide by 5 feet high and the flow line length shall be 52 feet , pending the final engineered design . e . Exterior dimensions ( based upon wall , floor , & lid thickness ) shall be determined by the structural engineer . f . Concrete shall be Type I / II sulfate resistant Portland cement . g . Minimum clear cover on reinforcement shall be 1½ inches on all surfaces except the top deck , which shall have 2 inches minimum clear cover . Concrete clear cover on reinforcing shall not be less than ACI minimum values . h . Epoxy coated reinforcement is not desired . i . Design shall be stamped & signed by a Colorado Registered Professional Engineer . 2 . Manufacturer shall provide # 4 x 2 ’ 0 ” Dayton D - 101 - A female dowel bar splicers in two rows , at 12 ” on - center in each row for the sidewalls and top slab of the box , similar to the diagram below . The bottom slab shall have # 5 x 2 ’- 0 ” Dayton D - 101 - A dowels at 12 inches on - center . Dowel bar splicers shall be placed around the entire perimeter of each end section to develop reinforcing with the cast - in - place apron , headwall and wingwalls .

Rocky Mountain E-Purchasing System

2026-05-06