Caisson

Serial Information: Civil Engineering—ASCE, 1984, Vol. 54, Issue 7, Pg. 48-48


Document Type: Feature article

Abstract:

The Jamaica Bay Water Pollution Plant was renovated and upgraded from l973-l983 and included sinking a 116 ft. x 105 ft. caisson 50 ft. deep adjacent to city streets and buildings. The reinforced concrete caisson was sunk by constructing four 12.5 foot lifts of perimeter wall and then gradually and uniformally removing the supporting earth from the center of the caisson with airlifts, jets and clam shells. A 5 ft. thick concrete sealer was placed over the entire caisson bottem; after it hardened, the site was dewatered by pumping down to the basement level. Thickeners, digestion tanks, preliminary tanks, aeration tanks and final settling tanks were modified or replaced and the system remained in service at all times. Mechanical replacement was being performed while running the plant with half of its four thickening tanks.

Subject Headings: Caissons | Wastewater treatment | Water pollution | Sedimentation tanks | Reinforced concrete | Walls | Streets

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