Projects
740 8th Ave, NY, NY
Support of excavation
Located along subway lines, near landmarked properties, and close to Times Square, this two-cellar high-rise presented delicate challenges. Space was limited and multiple types of shoring were required, so careful sequencing was essential to support surrounding buildings properly. Under close and recurring scrutiny of the New York City Transit Authority and Department of Building, Ancora successfully implemented a variety of shoring systems including tiebacks, rakers, underpinning, secant walls, and cross-bracing, allowing the project to remain on schedule.
323 8th Avenue, NY, NY
Full Demolition
The second floor and roof of this building were originally indoor tennis courts, built with a bubble dome structure. The roof’s floor framing system included custom-made open-web steel joists spanning more than 100 feet. Also challenging was the high traffic levels on 8th Avenue, which limited access for demolition work. Ancora designed the plans for the successful demolition of the building and enclosure of the site for support of excavation and subsequent new building.
4302 4th Avenue, NY, NY
Structural Bracing and Partial Demolition
Constructed in 1886, this old police precinct station house and stable received landmark designation in 1983, meaning the facade of the station house had to be preserved. Ancora created the full demolition plans for the stable and the partial demolition plans for the station house, and we designed the steel shoring towers to support the facade of the station house during demolition and new construction.
Both the New York City Marathon and the “R” subway line run along 4th Avenue, with the subway tunnel less than 20 feet from the shoring towers. The towers remained in place for approximately three years, preserving the historic facade without interfering with demolition, excavation, new construction, subway operations, or marathon runners.
207 West 84th Street, NY, NY
Full Demolition
Originally five buildings with separate gravity and lateral floor systems, this structure was combined into one building with added wall openings, corridors, and catwalks. This unusual construction history resulted in varied floor and structural systems, including timber framing, concrete-encased steel framing, cold-formed steel framing, and masonry arches. Ancora created the demolition plan for the building and designed successful waterproofing and patching systems for the neighbors’ exposed walls.