A structural retaining wall positioned adjacent to a bridge abutment, box culvert, or tunnel entrance. These walls angle outward to hold back the roadway embankment and prevent soil from spilling into the waterway or right-of-way. They channel water flow smoothly into the culvert opening and stabilize the earth fill supporting the approaching roadbed.
Heard on the job
The excavation crew needs to backfill behind the south wing wall before we pour the approach slab.