Box Culverts. The Consultant shall provide the structural design for all box culverts (new and/or existing) for both storm water and wildlife crossings. Existing box culverts that are hydraulically adequate shall be structurally evaluated to determine whether it is appropriate to extend or replace the structure. Applicable FDOT Box Culvert standards shall be evaluated and incorporated to the extent possible. All box culverts are to be determined by the Consultant and approved by the County. [Add locations here]
Box Culverts. (If Required) Details shall be provided for box culverts showing all dimensions, critical elevations and all reinforcing steel. Major box culverts may be included in the bridge plans portion of the construction plans.
Box Culverts. Box culverts shall be built to the lines, levels and dimensions shown on the drawings or as directed by the Engineer. The base shall rest on firm soil and if the nature of the soil encountered requires the foundation to be lowered, the extra depth excavated shall be filled up with class 15 concrete containing 25% of plums. The bottom of the excavation shall be filled with class 15 blinding concrete. The top of the base slab shall be finished smooth to a steady gradient and the fall shall be as directed by the Engineer. The base slab and the cut-off walls shall be executed in class 30 concrete. The supporting walls and the wing walls shall be built with class 30 concrete. All exposed surfaces shall have a smooth off shutter finish and construction joints shall be rubbed down to a smooth finish. The supporting walls and the wing walls may be built in masonry at the option of the contractor. The top of the supporting walls shall be finished smooth to a perfectly level surface (by a layer of concrete in the case of masonry walls) so that no rocking of the precast apron slabs occurs once the latter is fixed in position. The apron slabs shall be cast to have a smooth off shutter finish to the dimensions and levels given in the drawings or as directed by the Engineer in class 30 concrete. These slabs may be cast in-situ or precast at the option of the contractor. If they are precast, they shall, in all respects, comply with the requirements for precast concrete given in Article 8.12.
Box Culverts a. The construction of box culvert extensions, or demolition or maintenance activities on any box culvert, shall take place outside of the breeding and nesting season of migratory birds, which begins April 1 and extends through August 31, unless exclusionary barriers are put in place to prevent birds from nesting. Exclusionary barriers consist of overlapping strips of flexible plastic (also called “PVC Strip Doors” or “Strip Curtains”). Due to the risk of entanglement, nets are not appropriate exclusionary barriers on a box culvert. Exclusionary barriers on any box culvert must be installed prior to March 15, but at no time between March 15 and August 31 unless the GDOT State Environmental Liaison provides written authorization.
