461-1 Description.
Furnish and install multirotational bearings in accordance with the recommendations of the manufacturer and details shown in the Plans. Obtain all multirotational bearings from a fabricator that is currently on the Department’s Production Facility Listing. Provide bearings on each bridge from the same manufacturer. This Section covers the following types of multirotational bearings:
1.pot bearings .
2.disc bearings.
461-2 Materials.
Provide materials in accordance with the AASHTO LRFD Bridge Design Specifications and as follows.
461-2.1 Structural Steel:
Furnish structural steel conforming to ASTM A709 Grade 50W.
461-2.2 Stainless Steel:
Furnish stainless steel conformin g to ASTM A240, Type 316, 16 gage minimum thickness.
461-2.3 Metalizing Wire:
Furnish metalizing wire in accordance with ASTM B833, having an 85% zinc/15% aluminum (Z30700) composition.
461-2.4 Anchor Rods, Nuts and Washers:
Furnish galvanized anchor rods, nuts and washers in accordance with Section 962.
461-3 Design.
Design bearings in accordance with the AASHTO LRFD Bridge Design Specifications. Design bearing connections to allow for bearing replacement without having to remove the masonry plate o r sole plate. Detail all steel bearing components with sliding surfaces (e.g., stainless-steel plates or PTFE plates), masonry plates and elastomeric components to be replaceable. Welded attachments are not considered a replaceable connection. Design guid ed bearings for the lateral load shown in the Plans or 10% of the vertical load capacity of the bearing shown in the Plans, whichever is greater. For disc bearings, provide steel limiting rings around the top and bottom of the polyether urethane disc except if using the following: a minimum 62 Type (Shore) D durometer disc, a shear restraint device, and surface friction between the disc and steel plates.
461-4 Shop Drawings.
Submit shop drawings in accordance with Section 5. Include design calculations, s igned and sealed by a Specialty Engineer, confirming that all components are in conformance with the requirements of this Section. Include the following information on the shop drawings:
1.Items listed in AASHTO LRFD Bridge Construction Specifications
Article 18 — 1.1.
2.The bearing manufacturer’s instructions for proper installation, including the proper positioning settings for a minimum 100°F temperature range.
3.Items required in 461-6.1. FY 2023-24 Return to Table of Contents
461-5 Fabrication.
Fabricate bearings in accordance with the AASHTO LRFD Bridge Construction Specifications and the following requirements. Shop metalize and seal all steel surfaces, except PTFE -stainless steel sliding surfaces, the insides of pots and the bottoms of pistons in accordance with S SPC-CS23.00/AWS C2.23M/NACE No. 12, “Specification for the Application of Thermal Spray Coatings (Metalizing) of Aluminum, Zinc, and Their Alloys and Composites for the Corrosion Protection of Steel”. Prepare surfaces prior to metalizing to a "near white" metal condition in accordance with SSPC -SP10 using abrasives meeting the requirements of 560 -2. Achieve a sharp angular blast anchor profile meeting the requirements of ASTM D4417, Method C, 3 mils plus or minus 1 mil (75 µm plus or minus 25 µm). Provide a metalizing thickness of 10 mils minimum and 20 mils maximum. Prepare a sample coupon using the same processes used to prepare the surfaces and apply the coating to the bearing. Test the coating bond strength on the coupon in accordance with ASTM D4541. Th e bond strength must be a minimum of 700 psi. If the bond strength of the coating on the coupon is deficient, test the coating on the bearing. If the required bond strength is achieved, repair the coating on the bearing. Prior to shipment , bearings shall be packaged in such a manner to ensure that during shipment and storage the bearings will be protected against damage from handling, weather, or any normal hazard. Secure bearing assemblies in the fabrication plant with temporary metal bolts or straps to a void separation during transport and installation.
461-6 Testing and Certification.
461-6.1 General :
Test the materials used to fabricate the bearings and the completed bearings themselves in accordance with the AASHTO LRFD Bridge Construction Specifications . Submit all test results including visual documentation of the bearing both during testing and upon disassembly after testing to the Engineer.
461-6.2 Long-Term Proof Load Test: Conduct long -term proof load testing on full -size
bearings on a per LOT basis using the reactions, rotations and movements shown in the Plans for each type of bearing.
461-6.3 Long-Term Deterioration Test: Long-term deterioration testing requirements
will be considered satisfied by either of the following:
1.Testing of full -size bearings on a per LOT basis.
2.Prequalification in accordance with Materials Manual Chapter 11.1. The capacity of successfully tested bearings must be within 25% of the required demand specified in the Plans (reactions and resultant com pressive stresses, rotations, and movements) for prequalification testing to be considered satisfied for a project. Test results for bearings of a given type and configuration are valid for five years from the original date of testing. Production bearing s must be manufactured using the same materials, methods, and quality control procedures as those used for testing.
461-7 Installation .
Store multirotational bearings delivered to the bridge site under cover on a platform above the ground surface. Protect bearings at all times from damage and ensure they are clean, dry and free from dirt, oil, grease or other foreign substances before placement. Install the bearings in accordance with the recommendations of the manufacturer, contract drawings, and as may be directed by the Engineer. If there is any discrepancy between the recommendations of the FY 2023-24 Return to Table of Contents manufacturer, these Specifications, and Contract Drawings, the Engineer will be the sole judge in reconciling any such discrepancy. Obtain the services of a qualifi ed technical representative, employed by the manufacturer of the bearings, to supervise the first installation of each type of bearing (expansion pot, fixed pot, expansion disc, fixed disc or other type as defined by the Engineer) but for only one size of each type. Submit to the Engineer a certified statement from the manufacturer that its representative has the necessary technical experience and knowledge to supervise bearing installations and to train Contractor personnel about proper bearing installatio n procedures and methods. Do not install the bearings before the Engineer receives the certification and the representative is on the job site. Assume this responsibility at no further expense to the Department. Perform any required touchup repair and fie ld metalizing as directed by the Engineer.
461-8 Method of Measurement.
Quantities for fixed and expansion bearings will be the plan quantity number of each type of bearing constructed and accepted.
461-9 Basis of Payment.
461-9.1 Basic Items of Bearings : The Contract unit price per each for bearings will be
full compensation for all work and materials necessary for the complete installation. Such price and payment will include, but not limited to, the following specific incidental items:
1.testing,
2.tools and equipment required for installation,
3.any work to replace rejected bearings,
4.any repairs to the metalized coating on the bearings,
5.all costs associated with the manufacturer’s installation technician ,
6.sole plate, masonry plate, high strength bolt assemblies , and anchor rod assemblies.
461-9.2 Payment Items:
Payment will be made under: Item No. 461 -113- Multirotational Bearing Assembly - Fixed - each. Item No. 461 -114- Multirotational Bearing Assembly - Expansion - each. FY 2023-24 Return to Table of Contents SECTION 462 POST-TENSIONIN G
462-1 Description.
1.Furnish, test, transport, store, handle, and install all components of Post -Tensioning (PT) systems, in accordance with the requirements of this Section and the component manufacturer’s recommendations. Constituent components of PT systems include, but are not limited to, anchorage assemblies, filler containment assemblies, filler material, and related steel reinforcement. Use the most stringent requirements, as determined by the Engineer, of those specified in this Section or the component manufacturer’s recommendations for protecting components from damage due to environmental exposure, improper handling, or improper installation.
2.With the exception of mild reinforcing and prestressing steel, furnish all PT system components from a single supplier (vendor).
3.Submit PT system shop drawings in accordance with Section 5. Perform PT system testing in accordance with Section 960. Include in the PT system testing all possi ble combinations of components to be incorporated into the structure.
4.Use only PT systems meeting the requirements of Section 960 and approved by the Engineer in accordance with Section 5 .
a.Use only PT systems of appropriate type and size required to construct tendons shown in the Contract Documents.
b.Use only the exact manufacturer and/or model of major components, as defined in 960-2, that were used in system testing and as listed on the approved PT system shop drawings.
c.With the exceptio n of local zone reinforcement, do not substitute, modify, or delete any major components , as defined in 960 -2, of a PT system approved by the Engineer for use on the project .
5.Provide a mockup test in accordance with this Section. PT system acceptance testing may be performed concurrent with mockup testing if performed prior to installation of any PT system hardware .
6.Just prior to PT tendon installation, blow oil -free dry compressed air meeting ASTM D4285 through the duct . Provide visual confirmatio n that the duct is free of water and moisture.
7.Install the PT tendon (e.g., strands, wires, or bars) in duct. Stress the PT tendon to a predetermined load, anchor ends directly against hardened concrete and install permanent anchorage caps.
8.Just prior to wax filler injection, blow oil -free dry compressed air meeting ASTM D4285 through the duct. Provide visual confirmation that the duct and tendon are free of water and moisture.
9.Inject ducts with filler to completely fill voids and install prot ection at anchorages.
10.Submit all required documents in accordance with this Section and Section 5 to the Engineer for review and written approval.
11.Arches, cable supported and extradosed bridges are not covered by this Specification.
12.Install duct filler. Provide fully filled duct and anchorage assemblies free from leaks, blockages, and voids. Submit test data to the Engineer to verify that the work meets the requirements of this Section. Perform filler injection operations in accordanc e with 462 -7.4. FY 2023-24 Return to Table of Contents
Source: Florida Standard Specifications for Road and Bridge Construction, 2024 Edition. Pages 669–671 of 1,299.