Originally constructed in 1898, the Shore Line Bridge carries the Massachusetts Bay Transportation Authority (MBTA) commuter rail and CSX freight lines over Amtrak’s Northeast Corridor. MBTA needed to replace the existing steel through-...
Vermont’s Agency of Transportation was undertaking the rehabilitation of Bridge 219 over Otter Creek. As part of this project, Engineers Construction, Inc. (ECI) needed to replace distressed stone-masonry pier with a new reinforced concrete...
Constructed in the 1950s and carrying over 100,000 vehicles per day, the Storrow Drive Interchange is a major commuting route and link to Back Bay. The interchange includes two reinforced concrete tunnels with steel-framed and reinforced...
Working for the University of Notre Dame, SGH completed a feasibility study (Phase 1) to determine how to support and enclose a 5 MV vertical ion accelerator over an existing physics laboratory. The accelerator, weighing about 24,000...
The Central Artery/Tunnel (CA/T) Project relocated Boston’s elevated Central Artery below ground. The CA/T tunnel walls used soldier pile tremie concrete (SPTC) slurry walls as a component of the final structure. During later stages of...
The Crystal River Nuclear Power Plant, Unit 3, is part of a 4,700 acre energy complex that contains a 914 MW pressurized water reactor. When the client planned rigging operations for replacement of a steam generator at Unit 3, they required an...
The Defense Advanced Research Projects Agency Space Surveillance Telescope (SST) has a 3.5 m dia. primary mirror with large, curved, focal surface array sensors. The device offers a wider view of deep space objects to support broad-area searches...
The Electronic Space Systems Corporation and Georgia Tech Research Institute sought to construct a highly accurate compact range reflector at the U.S. Army Electronic Proving Ground that would maintain a surface accuracy of 0.007 in. rms under...
Opened in 1971, Neponset River Bridge carries Morrissey Boulevard traffic over Neponset River. The superstructure consists of steel plate girders and cover-plated steel stringers supporting a 7.5 in. thick reinforced concrete deck. The girders...