TUNNELS INJECTION CASE STUDY
Project: Downtown Path Restoration Program
Location: New York, NY
Owner: Port Authority Trans-Hudson Corporation of NY and NJ
GC: Yonkers / Tulley / Pegno, JWI
As the World Trade Center Towers collapsed, the subway station beneath them was totally destroyed and the tunnels leading into and out of it were severely damaged. The tunnels that lead to New Jersey beneath the Hudson River partially filled with water.
The first phase of rebuilding following the months of clean up, was to restore the subway station and its tunnels. Yonkers / Tully / Pegno (Y/T/P) of Yonkers, NY was in charge of this task.
As the tunnels were de-watered and work progressed, several areas were found to be leaking where non had been prior to 9/11. Some of these leaks interfered with the pouring of new concrete duct banks that were being installed in the tunnels, therefore the water infiltration had to be eliminated.
Y/T/P needed an injection waterproofing system and resins that are specified by the NYC DOT and Port Authority for below-grade water leak repairs. They contacted Jean’s Waterproofing, Inc. (JWI), who had been applying injection resins for over 15 years.
Together JWI and Y/T/P developed a joint venture where JWI would supply the supervisory expertise and equipment to direct and guide the Y/T/P personnel through the proper preparation and application of the resin injection system.
The resin chosen was a non-toxic, water-based, acrylate-ester resin.
The project was a success and continues to be so, as more leaks are being discovered as the workers proceed through the tunnels.
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