Companies working on the $670-million Mississippi River Bridge in St. Louis have shattered geotechnical records with a 36,067-ton load test on one of the bridge's drilled-shaft, concrete foundations. Photo: MTA Joint Venture Record-breaking load cell makes its final descent. Related Links: St. Louis Link Will Be Tough, Diverse, Green Osterberg Cell Transformed Testing Award of Excellence Winner Clyde Baker The test, performed this past June, consisted of drilling an 11.5-ft-dia shaft 43.5 ft under the riverbed, then cutting an 11-ft-dia socket more than 23 ft into the underlying limestone bedrock. An Osterberg hydraulic load cell was then lowered to the
The market is generally healthy and steadily growing, and margins are up for large specialty contractors. Further, advances in design tools and owner demand for collaboration are giving subcontractors a seat at the table early on in projects.