Quazite® Pre-Formed Polymer Concrete Box Collars - Hubbell Power Systems

Introducing polymer concrete box collars by Hubbell. Often, underground enclosures are surrounded by a poured concrete apron that protects the cover and sidewall from damage. The process is labor intensive and difficult to justify when the job is small. The project starts with excavation, suitable forms, gravel backfill, and reinforcing mesh. Concrete is either trucked in or mixed on site, and poured in place. Vibration is used to ensure the even distribution of the wet concrete. Skilled labor trowels the concrete to a smooth finish. A box collar is a simple, effective alternative that eliminates much of the labor and time in installation. After excavating approximately three inches of top soil around the enclosure, add a thin layer of gravel backfill and tamp with a mechanical compactor. The finished grade should be three inches below the top of the enclosure. Box collars for smaller enclosures can be easily lifted and placed by hand. Larger box collars include threaded inserts for adding lifting eyes. A small excavator can assist in placing larger collars—generally those are collars for enclosures 24 inches x 36 inches and larger. Once in place, lifting eyes are removed. Backfill is added so that the collar and the enclosure are level with grade. The mechanical compactor can be used again to tamp the backfill before grass seed or other ground cover is added. A box collar can be installed in a fraction of the time required for cast-in-place concrete. The collar can also be easily replaced if damaged. For more information, please contact your local Hubbell representative.