DJ&A provided surveying and engineering services for the rehabilitation of a 120-foot steel bridge in Idaho. DJ&A completed an inspection of the existing steel truss, timber approach spans and concrete substructure then performed a load rating of all of the spans to determine the value in rehabilitating the structure.
Although not typically a viable option for single lane county bridges, DJ&A’s investigation found that bridge rehabilitation would be the most a cost efficient and effective means of extending the serviceability of this bridge.
DJ&A prepared preliminary cost estimates and developed rehabilitation plans and specifications for the structure. Repair work included replacing the timber deck and rail elements, and repairing the concrete piers and abutments.
- Conducted bridge inspection bridge load ratings
- Design preliminary alternatives
- Finalized structural design, bridge plans, cost estimate and project specifications
- Reviewed of construction shop drawings
- Scanned the pre-construction structure for historic preservation documentation
In addition to providing a three-dimensional image of the existing bridge for historic preservation, DJ&A’s use of a high definition laser scanner on this project proved to be an effective tool in gathering information on the existing structure without making extra trips to the field.