Metropolitan Transportation Authority, Construction Administration and Inspection Services, Superstorm Sandy Rehabilitation, Queens Midtown Tunnel

Posted on March 19, 2015

Client: Triborough Bridge and Tunnel Authority
Project Type: Construction Administration and Inspection Services for Project QM-40S, Superstorm Sandy Restoration and Mitigation and Projects QM-40/QM-18, Rehabilitation of the Tunnel Walls, Roadway and Manhattan Exit Plaza at the Queens Midtown Tunnel
Project Period: Ongoing
Project Cost: $300,000,000

Major Components

  • Ceiling Slab and Veneer Panels
  • Roadway Slab and Cathodic Protection System
  • Fresh Air and Exhaust Ducts
  • Side Walls, Upper Bench Walls, Catwalk and Railing
  • Low Tension Duct Bank
  • Traffic Signal Control and Wall Signage
  • Ventilation Control
  • Tunnel Lighting
  • Code Call System
  • Tunnel CCTV System
  • Fire Standpipe System
  • Drainage System
  • Mid-River Pump Room

Project Description

MTA-0241_001D&B Engineers and Architects, P.C. is providing, as a subconsultant, Construction Administration and Inspection Services for  Project QM-40S, Superstorm Sandy Restoration and Mitigation and Projects QM-40/QM-18, Rehabilitation of the Tunnel Walls, Roadway and Manhattan Exit Plaza at the Queens Midtown Tunnel.

In October 2012, the Queens Midtown Tunnel (QMT) was significantly impacted by Superstorm Sandy. Major flooding occurred  in both the North and South Tubes of the tunnel. Approximately 2,500 feet of each tube was flooded resulting in damage to the  tunnel, ventilation buildings and the systems within. Projects QM-40 and QM-40S include work for replacement, repair or  upgrade of tunnel elements, systems and components to restore them to their originally intended functionality and to arrest propagation of any further deterioration.

Project QM-18 involves improvements to the tunnel’s Manhattan Exit Plaza. The Manhattan Exit Plaza begins at the portal of the  North tube approximately mid-block between 1st and 2nd Avenues just south of East 37th Street. Approximately mid-block between 2nd and 3rd Avenues, the plaza splits into an exit to East 37th Street and a left turn to service the downtown exits at  East 34th and 35th Streets. The plaza is a U-shaped “bathtub” structure comprised of a base slab and retaining walls, designed to be watertight and to resist uplifting hydrostatic forces with adequate dead load. Therefore, the thickness of the section varies  depending on the applicable ground water table elevation. The Manhattan Exit Plaza is approximately 70 years old and  the base slab is constantly in need of maintenance repairs.

Improvements under Project QM-18 include:

  • Rehabilitation of the base slab in areas where the concrete is exhibiting signs of deterioration;
  • Rehabilitation of expansion joints of the base slab;
  • Rehabilitation of gutters and sidewalks;
  • Installation of drainage facilities in the plaza, particularly in areas where the base slab is severely deteriorated; and
  • Cleaning and re-pointing of the retaining walls.

MTA-Picture1D&B is currently providing Preconstruction and Constructability and Bidability Reviews.

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