Trapazoidal Steel Box Girders

Still working on the Central Artery Inspection contract, we have switched from concrete segmental boxes to steel box girders.

Now just north of Boston near Cambridge and Somerville, we are inspecting ramps for Interstate 93 which consist of steel box girders.

Currently I'm working on a bridge which has two steel box girders there for making it a fracture critical bridge as well. The bridge is six span continuous with a cast in place concrete deck. The bridge carries Interstate 93 Ramps NS and SN over Boston Sand and Gravel.

For the exterior of the box we used a manlift to inspect and gain access to the interior of the box. The interior of the box is a permit required confined space so we needed air meters and rescue inhalers.