Aviation | Transportation

Miami-Dade Transit | Metrorail Rapid Transit System

Dade County, Florida

The Metrorail consists of 23 miles of elevated transit structures and 20 passenger stations.  Near the end of construction, the Miami Dade County Office of Quality Assurance retained RRJ to consult on concerns regarding elements of the system's structure design and construction. Executed over a five-year period, RRJ provided engineering consulting services including: an investigation and structural analysis of the prestressed, precast concrete guideway double-tee elements; full-scale load testing; specialized field testing consisting of condition surveys, inspections and radiography; development of a comprehensive baseline inspection of the entire girder population; review of the pier cap ledge capacity for severe derailment loading involving a design review of ledges, and full-scale load testing of four caps; development of new methods of analysis and repair of pier caps, and laboratory load testing of a 1/3 scale model of pier caps.  RRJ  developed of a comprehensive, integrated structural bridge inspection program for the Metrorail System.

Michigan Avenue Bascule Lift Bridge Restoration

Chicago, Illinois

When the Michigan Avenue bascule bridge leaf accidentally lifted out of control, it rotated so violently that it tore itself off its main supports and dropped to the bottom of the counter-weight pit.  RRJ investigated the cause of this freak accident and assisted in restoring the bridge with the primary task of lifting and positioning the 3.2 million pound bridge and repairing the parts damaged by accident.

RRJ conducted a condition survey and computer modeling of the concrete pit walls, floor, and caissons and analyzed them for the massive jack reactions so that the jacking operation could be performed safely.  Repair designs were required of the main bearing beams and anchorage system along with designs for various temporary steel brackets used to reposition the bridge. Hydraulic jacking was used to restore the bridge to its original position.

Midway International Airport | Terminal Building

Chicago, Illinois

Performance verification testing of one of the curtain wall installations at the new terminal building.  Initial air infiltration and water penetration tests verified compliance with the project air infiltration requirements but revealed nonperformance issues during water penetration testing. An investigation into the as-built curtain wall construction revealed end dam detailing and isolated glazing deficiencies. Together with the glazing contractor developed repair procedures to address the deficiencies. Subsequent testing with remedial repairs in place verified compliance with the project specifications.