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Memorandum All Style Section Personnel J. Kapur August 16, 2002 Bridge Bearing Replacement Arrangements This design memo is intended to clarify the intent of Section 8. 4.3. C. 6 of the Bridge Design Manual. All bridge bearings besides steel enhanced elastomeric bearings will generally be created and detailed to accommodate the installation and operation of hydraulic jacks to facilitate bearing replacement.

Some concerns have emerged relating to the requirement to accommodate elastomeric bearing replacement at prestressed concrete girder bridge abutments. End type "A" girders (having essential end diaphragms) need not be detailed to accommodate elastomeric bearing replacement. End type "B" girders (having L-type abutments) will be designed and detailed to accommodate elastomeric bearing replacement.

The basic end diaphragms for long span girders may not have sufficient flexural and shear capacity for the jacking operations. The designer shall inspect these and provide enough steel support to accommodate shear forces and moments caused by jacking operations (Girder end types "A" and "B" are portrayed on BDM sheets 6.

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2-A1-6). Incidentally, intermediate piers having actually steel reinforced elastomeric bearings shall also be created and detailed to assist in bearing replacement. Background Girder end type "A" corresponds to bridges having integral end diaphragms over abutments. These structures are reasonably brief (less then 400 feet). Consequently, the elastomeric bearings go through smaller longitudinal shear distortions and rotations.

Girder end type "B" corresponds to bridges having L-type abutments. These structures are typically longer that 400 feet or have big skew angles. As a result, they go through bigger longitudinal shear deformations and rotations. Check Here For More of these bearings slipping out and needing resetting or replacement is higher. Easy modifications having very little economic impact can be made to girder stops and/or end diaphragms to facilitate hydraulic jack setup and bearing replacement.

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Freyssinet provides a range of jacking techniques, consisting of applications which overcome problems in both new building and existing structures or buildings. Jacks can be run vertically to raise structures but also horizontally to move them. Freyssinet's abilities include bridge lifting and moving, bearing replacement, high strength bar tensioning, load transfer, pre-stressing, control of settlement and settlement jacking, force measurement, and weighing.