Concrete Products

JAN 2015

Concrete Products covers the issues that attract producers of ready mixed and manufactured concrete focusing on equipment and material technology, market development and management topics.

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www.concreteproducts.com January 2015 • 63 FEATURE COVER STORY The gantry scheme proved its mettle during the frst prestressed girder erection phase (eastbound structure, outer lanes). Each main frame is shifted after a row of beams is placed on new piers. Ed Kraemer & Sons confgured the gantry to bear equally on the exist- ing structure and new pier, the latter via a temporary bracing and mounting assembly (above). The method limits primary lifting re- quirements to one main crane; more importantly, it enables a girder erection sequence between new eastbound and westbound structures such that the fnished bridge will have one longitudinal joint in- stead of three on the original crossing. Crews engage girders for hoisting by threading lifting plates through top fanges, securing them with six bolts near the web midpoint. County Materials is fabricating the 150- to 168.5-ft. bulb tees to Kraemer's lifting-hardware specs and with up to 50 0.6-in. diameter prestressing strand, 22 draped. PHOTOS: Illinois Tollway

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