120 Tons of Steel Suspended over the Construction Site
(Room 200 C)
24 Sep 19
4:30 PM
-
5:00 PM
Tracks:
AREMA Technical Sessions By Date- Structures, AREMA Technical Sessions By Functional Group- Structures, Technical Sessions By Day- Tuesday
Norfolk Southern (NS) Bridge M-275.70 over Randall Creek is a three-span deck plate girder bridge with masonry abutments supported on timber piles and two masonry piers bearing on spread footings. On May 23, 2018, following a localized storm event, NS’ storm patrol discovered pier 1 washed away and exposing the adjacent east abutment’s timber piles. In addition, span 1 a 30’-0” DPG span and span 2 a 71’-6” DPG span were suspended, pinched together in midair; approximately 120 tons of steel suspended without a pier for support. Emergency mobilization of Scott Bridge Company for construction services and retainage of STV for engineering services was issued by NS. As the water receded, 5,000 tons of rock was installed from the east abutment extending into the creek to and slightly beyond the missing pier location. On this island of rock, 36 steel crane matts, 5’x14”x30’, were stacked providing a temporary support replacing pier 1, un-pinching the spans. As emergency support installation was being developed and installed, a final design including means, method, material, capacity and location was being developed in conjunction. On May 27, 2018, the first train operated over the temporary support and construction of the permanent pier began. Two six-foot diameter drilled shafts were installed supporting a steel cross cap. On July 19, 2018, the new permanent pier became operational. The paper features the evolving emergency temporary support design and construction, while considering the permanent pier design and construction, all taking place beneath 120 tons of steel precariously suspended. *Missed this Session or want to view it again? Stop by the VirtualAREMA kiosk located in the Registration area to purchase this product today!