Jefferson Lab Site Tour
Experimental Hall C Post-Tensioning Cables - September 1991
September 17, 1991: Wrapping the "Post-Tensioning" cables around the Hall C "Tension Ring". These steel strands, which are stressed to over 70,000 PSI, resist the outward forces which will be produced by the weight of the earth that will ultimately cover the dome. The winding apparatus was pulled by a large tractor for hundreds of revolutions around the dome. Electronics mounted on the winder allowed the operator (standing on tractor) to precisely control the tension in the Post-Tensioning cables. The winder, and many of the techniques used in the construction of the domes, were invented and perfected by the subcontractor, Crom Corp.
This tour reflects Jefferson Lab as it was in the late 1990s and early 2000s. In particular, this predates the 12 GeV upgrade and the addition of Hall D. For a modern look at the Lab, please see the Jeffeson Lab Virtual Tour.
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For questions about this page, please contact Steve Gagnon.