565.01 Description
This work is the furnishing and placing of bearing devices.
565.02 Materials
Furnish material in accordance with the following subsection requirements:
A.Elastomeric Devices
1.Elastomeric Bearing Devices ............................. 711.14
2.Steel Laminates................................................. 711.14
3.Polytetrafluoroethylene (PTFE) ......................... 711.20
4.Stainless Steel Sheets....................................... 711.20
B.Fiber Reinforced Pads .......................................... 711.16
C.Steel Bearing Plates .............................................. 711.02
565.03 Construction Requirements
565.03.1 General
Submit shop drawings as directed by the contract. Do not fabricate bearings prior to receiving approved drawings.
A.Packaging. Package and protect the bearings from damage and prevent contamination of the contact surfaces of the sliding elements during handling, transporting, and storage. Replace any bearing damaged by handling, transporting or storage at no cost to the State.
B.Installation of Elastomeric Devices. Place bearings on a level surface. Correct any misalignment of the support to form a level surface. The instantaneous temperatures of the sole plates must not exceed 300 °F (149 °C) when field welding the sole plate to the steel girder or base plates embedded in concrete beams. Replace any bearing damaged during installation at Contractor expense.
565.03.2 Bearing and Anchorage
Place masonry bearing plates on bearing areas that meet the contract requirements. Install bearing plates level to provide full bearing on the masonry. Place masonry bearing plates on fiber reinforced pads in accordance with Subsection 711.16 that project a minimum ½-inch (13 mm) on all sides of the bearing plate. Finish the bearing area to a level plane. The surface must not vary by more than 1⁄16-inch (2 mm) from a straightedge placed in any direction across the area. Extend the bearing area at least 1-inch (25 mm) beyond the bearing contact area. The finished elevation of the bearing surface must not vary by more than ⅛-inch (3 mm) from the specified beam-seat elevation unless otherwise approved by the Project Manager.
A.Steel Structures. Make allowances for bottom chord elongation due to dead load when setting shoes or bearing plates for steel truss spans. Install bridge rocker shoes to be vertical under full dead load at 32 °F (0 °C). Raise spans and make adjustments if the rockers are not correctly positioned with the final dead load on spans.
B.Steel Shims. Use steel shims when necessary to bring the masonry plates up to grade. Use shims of the same size as the masonry plate and a minimum ¼-inch (6 mm) thick. 565 – BEARING DEVICES 2020 EDITION V5.1 565-2
565.03.3 PTFE Bearings
Furnish PTFE bearings composed of pure, unreinforced, polytetrafluoroethylene fluorocarbon resin sheets bonded to the elastomeric pads. Weld stainless steel sheets to the sole plates as shown in the contract. Use only new materials for the manufacture of the bearings with no reclaimed material incorporated into a finished bearing. The dimensions of the finished bearings must meet the tolerances as specified in Section 564 . Unless otherwise approved by the Project Manager, furnish bearing assemblies, including the sole plates, as a complete unit from one manufacturing source. Polish stainless steel in contact with the PTFE surface to a mirror bright finish as specified in ASTM A480, finish No. 8. Edge weld the stainless steel sheets to the sole plates using E308L or E309L electrodes as specified in ASW A5.4 and Section 624, sized for the stainless steel sheet. Any portion of the weld that extends above the surface of the finish of the stainless-steel sheet must be ground to the surface of the sheet. Repair any imperfections in the finish of the stainless-steel sheet caused by welding or grinding prior to shipment. Vulcanize bond steel backing plates and masonry plates, if any, to the elastomeric pad.
565.04 Method of Measurement
Elastomeric devices are measured by each device required for 1 beam seat. Fiber reinforced pads are not measured for payment. Steel bearing plates are included in the cost of concrete beams but are measured in accordance with Subsection 556.04 if steel girders are supplied.
565.05 Basis of Payment
Payment for the completed and accepted quantities is made under the following: Pay Item Pay Unit Elastomeric Bearing Devices Each Elastomeric Bearing Devices-PTFE Each
Referenced in this section
Sections that cite this one
Bearing Devices in other states
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Source: Standard Specifications for Road and Bridge Construction, 2020 (v5.1) Edition. Pages 397–398 of 611. View official source ↗