Products 01/05/2011 Tunnel Construction: Custom Multi-Armed Rig Drills Deep In a brief follow-up to the Atlas Copco Boomer XL3 D featured in ENR’s Nov. 3, 2010, issue, a custom-built Atlas Copco Boomer XE4 C drill rig currently is being used to dig a rail tunnel near Gothenburg, Sweden. Tunneling contractor Veidekke, Oslo, Norway, is employing the fully computerized unit to drill all the pre-grout holes as well as blast holes in the tunnel. The machine’s four booms were equipped with COP 3038 rock drills and feature the new Auto RHS E rod-handling system for drilling up to 30-meter-deep grout holes
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.