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FP-96 English Version - Eastern Federal Lands Highway Division

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Section 564Fabricate elastomeric bearings according to AASHTO M 251. Use materialthat meets the flash tolerance, finish, and appearance requirements of theRubber Handbook as published by the Rubber Manufacturer's AssociationIncorporated, RMA F3 and T.063 for molded bearings and RMA F2 for extrudedbearings. Determine compliance with AASHTO M 251, level I acceptancecriteria.Mark each reinforced bearing with indelible ink or flexible paint. The markinginformation shall include the order number, lot number, bearing identificationnumber, and elastomer type and grade number. Unless otherwise specified,mark on a face that is visible after erection of the bridge. Furnish a list of allindividual bearing numbers.Place bearings on a level surface. Correct any misalignment in the support toform a level surface. Do not weld steel girders or base plates to the exteriorplates of the bearing unless there is more than 1.5 inches of steel between theweld and elastomer. Do not expose the elastomer or elastomer bond to instantaneoustemperatures greater than 400 bF.564.05 Rocker, Roller, and Sliding Bearings. When TFE coatings arerequired, use coatings conforming to Subsection 564.07.Fabricate rocker, roller, and sliding bearings according to the details shown onthe plans and to Section 555. Perform fabrication according to the standardpractice in modern commercial shops. Remove burrs, rough and sharp edges,and other flaws. Stress relieve rocker, roller, and other bearings that are builtup by welding sections of plate together before boring, straightening, or finishedmachining.Thoroughly coat all contact surfaces with oil and graphite just before placingroller bearings. Install rocker, roller, and sliding bearings so they are verticalat the specified mean temperature after release of falsework and after anyshortening due to prestressing forces. Take into account any variation frommean temperature of the supported span at time of installation and any otheranticipated changes in length of the supported span.Make sure the superstructure has full and free movement at movable bearings.Carefully position cylindrical bearings so that their axes of rotation align andcoincide with the axis of rotation of the superstructure.504

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