Flushing Commons is a large mixed use development project located in Flushing, Queens, NY. The Laquila Group, Inc. was hired to perform the work associated with the excavation and foundation package, and was chosen to perform the work, in part, due to their reputation for successfully executing very large excavation projects with short schedule durations. The massive site measured approximately 70,000 SF and the total depth of the excavation was in excess of 50’, yielding 150,000 cubic yards of soil off the jobsite.
The project started with the installation of a conventional soldier pile and lagging wall, complete with 4 tiers of tiebacks to provide earth support. Multiple, massive excavators loaded as many as 100 loads of regulated soil on some days to quickly reach the subgrade depth. A deep well dewatering system was used to control groundwater. Concrete work started very early on, first with the construction of large spread footings and grade beams, then the foundation mat, and finally the 50’ high foundation walls. The foundation walls, some two-faced and some one-faced, were all poured in a single lift, maximizing production and reducing the overall amount of time to build the walls. All in all, over 10,000 cubic yards of concrete was placed on this project, sometimes using very novel placement methods. The project was successfully completed on time and on budget, allowing the superstructure work to advance on schedule.