Better Roads Digital Magazine
Issue link: https://read.dmtmag.com/i/109757
team will use three methods to check the amount of deformation in the truss: (1) Marks on the translation beams or track beams as described above. The contractor team will periodically check the actual location of the truss along the beams against numbers on OM's "Offset Table" to see if the truss is within tolerance for sideways bending. (2) Laser instruments attached to the truss itself with laser beams aligned along the truss. SSJV personnel will monitor the laser beams at each truss support point to make sure the truss stays in a straight line up and down as well as sideways. (3) Visual surveying by an SSJV sub- contractor with an instrument set up on shore. This survey program mentioned above will provide data on truss shape as well as on truss location. In addition to deforOmega Morgan crews in final preparation to slide the Sellwood span mation checks by the from its old concrete piers to new, temporary, steel piers. contractor team, the and other structures has installed county team will also electrical strain gauges on critido the following: cal truss members. These gauges (1) GPS surveying by a county engiwill measure deformations in neering team. the members during translation. (2) Strain gauge measurements Engineers on the county team on truss members. A local enhave set limits on the amount of gineering firm specializing in allowable strain. monitoring stresses in bridges XT r e m e P Cordless e r F o r m A N C e C o N V e N I e N C e XC-SerieS Cordless PumP The performance of a powered pump. The portability of a hand pump. • p to 2X faster than air powered pumps U • 8 volt Li-ion battery for long run time 2 • eighs less than most common hand pumps W • uilt to perform in the toughest work environments (700 bar/10,000 psi) B Learn more at www.enerpac.com/xc Text INFO to 205-289-3789 or visit www.betterroads.com/info Better Roads February 2013 21