Builders of the U.K.’s tallest skyscraper, London’s Shard, will save valuable time by excavating its three-floor basement while slipforming the core. A novel machine is now at work, plunging columns into pile tops some 15 meters below ground to prop up the rising core as soil beneath is removed. Slide Show Photo: Peter Reina / ENR The small site sits hard against the busy London Bridge railroad hub. Related Links: Top Down To Speed Shard Building With the core on the critical path, “the month or two” top-down exercise is “giving us breathing space,” says Bob Gordon, chief engineer of
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.