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Caissons Skirt a Tunnel

by Issa S. Oweis, (M.ASCE), Vice Pres.; Converse Consultants East, Caldwell, NJ,
John Muller, (M.ASCE), Assoc. Partner; Severud-Szegezdy Consulting Engrs., New York, NY 10017,


Serial Information: Civil Engineering—ASCE, 1988, Vol. 58, Issue 12, Pg. 75-77


Document Type: Feature article

Abstract:

Exchange Place Center is a 490 ft, 30 story office tower built directly over the existing transportation hub in Jersey City, N.J., where trains and buses meet the PATH Tubes that carry commuters under the Hudson River to and from Manhattan. Because of the PATH tunnels, most of the building's loads had to be transmitted to bedrock via drilled-in caissons installed adjacent to the tunnels. Concrete girders transfer the loads from the building columns to the 53 caissons, which are 44 in. dia. The caissons were installed by lowering a 48 in. dia. steel shell into a hole drilled by a 5 ft auger, then drilling with soil and rock augers. A total of 522 tons of core steel was used in the caissons, the largest being 98 ft long and weighing 730 lb/ft.

Subject Headings: Caissons | Tunnels | Drilling | Steel | Load factors | Buildings | Shell structures

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