Structural steel installed for top of Linac Tunnel

Construction workers began installing structural steel today for the top of the linear accelerator tunnel. The beams used in the installation are the heaviest steel beams manufactured in the United States, weighing in at 12 tons each. Sixty-one beams and seven columns will be installed by the end of the week. The columns weigh in at 2.6 tons a piece. Once complete, the tunnel top will weigh around 915 tons.