548ELASTOMERIC BEARINGS

New Hampshire Department of Transportation Standard Specifications – 2016 Description

1.1This work shall consist of furnishing and placing elastomeric bearing pads for structural members. The pads shall be

fabricated in conformity with the dimensions shown on the plans.

1.2This work shall consist of furnishing and placing elastomeric bearing assemblies for structural members. Assemblies shall

include elastomeric bearing pads, masonry and sole plates, connection bolts, anchor bolts, nuts and washers, shim plates and fabric bearing pads. The assemblies shall be fabricated in conformity with the dimensions shown on the plans. Materials

2.1Elastomeric bearing pads shall be furnished according to the Plans and as specified herein.

2.2Elastomeric compound shall be 100 percent virgin natural rubber meeting or exceeding the requirements of AASHTO LRFD

Bridge Construction Specifications, Section 18.2 – Elastomeric Bearings.

2.3Internal steel plates shall conform to AASHTO M 270 (ASTM A709/), Grade 36 or 50 (or ASTM A36, A572).

2.4External load bearing plates shall conform to AASHTO M 270 (ASTM A709/A 709M), Grade 50W (345W).

2.5Preformed fabric bearing pads for external bearing plates shall conform to 550.2.6, Type 1.

2.6Anchor bolts shall conform to 550.2.5.

2.7The surface finish of bearing surfaces shall conform to AASHTO LRFD Bridge Construction Specifications, Section 11.4.6.

2.8Quality Assurance.

2.8.1 The Contractor shall furnish certified test results indicating compliance with each physical and chemical property specified. Construction Requirements

3.1The fabrication, testing and installation shall be performed in accordance with the requirements of the Plans, AASHTO LRFD

Bridge Construction Specifications, Section 14, and Section 18.

3.2The Contractor shall submit all shop fabrication drawings for approval in accordance with 105.02.

3.2.1 Fabrication shall not begin until written approval of the submitted shop fabrication drawings has been received from the Department.

3.3The elastomeric bearing pads and assemblies shall be set on a carefully prepared surface as required by the applicable

provisions of 550.3.15.5.

3.4The anchor bolts shall be installed as required by the applicable provisions of 550.3.15.4.

3.5Elastomeric bearings. Following the manufacture of these bearings and verification of the int ernal steel laminates, the pin

groove openings shall be coated with an approved asphaltic sealer and the space filled with silicone caulking. Method of Measurement

4.1Elastomeric bearing pads or elastomeric bearing assemblies will not be measured, but shall be the Each final pay quantities

in accordance with 109.11 for bearings required as shown on the plans. When more than one structure is included in the Contract, separate item numbers will be used for each separate and complete structure. Basis of Payment

5.1Elastomeric bearing pads or elastomeric bearing assemblies are final pay quantity items and will be paid for at the Contract

unit price per each complete in place in accordance with 109.11. Pay items and units: 548.1X Elastomeric Bearing Pads (F) Each 548.2X Elastomeric Bearing Assemblies (F) Each New Hampshire Department of Transportation Standard Specifications – 2016

Description

General. This work shall consist of furnishing, fabricating, painting if required, transporting, and erecting all structural steel,

bridge shoes, and other materials in accordance with these Specifications, the contract documents, and as shown on the plans. 1.1.1 References within this section are identified by a section number (e.g. 3.15.5 Setting Bearings), and references to sections of AASHTO LRFD Bridge Construction Specifications (current edition and interim specifications) are identified by the abbreviation AASHTO followed by the section number (e.g. AASHTO 11.3.1.7). Materials

General. Materials for steel structures shall be as specified in the current edition and interim specifications of the AASHTO

LRFD Bridge Design Specifications, unless otherwise specified herein. 2.1.1 Materials shall conform to the AASHTO “ StandardS pecifications for Transportation Materials and Methods of Sampling and Testing”, in accordance with current editions and interim specifications, and as modified herein.

Structural steel.

Steel shall be furnished according to the following specifications, or as otherwise specified on the plans. 2.2.1 General. 2.2.1.1 Structural steel shall meet the Standard Specifications for General Requirements for Rolled Structural Steel Bars, Plates, Shapes, and Sheet Piling, ASTM A 6. 2.2.1.2 Unless otherwise specified, structural carbon steel shall be furnished for all structural steel. Structural carbon steel shall conform to AASHTO M 270 (ASTM A 709), Grade 36. 2.2.2 High-strength, low-alloy (HSLA) structural steel shall conform to AASHTO M 270 (ASTM A 709) Grade 50 or Grade 50W (weathering), or HPS 50W, as shown on the plans. 2.2.3 Charpy V-notch impact requirements. All structural steel used in main load -carrying member components subject to tensile stress shall conform to the requirements for Zone 2 of AASHTO M 270 for the longitudinal Charpy V-notch impact tests. 2.2.3.1 These impact requirements are mandatory for members including but not necessarily limited to rolled beams, welded cover plates, webs and tension flanges of built-up girders, flange and web splice plates, longitudinal stiffener plates, cross frames and their connection plates on horizontally curved girders, and other members as shown on the plans.

Paint.

2.3.1 Paint shall conform to NEPCOAT Qualified Products List A or B, unless supers eded by a Special Provision for Item 550.

High Strength Bolts.

2.4.1 Blank. 2.4.2 Specifications. 2.4.2.1 Bolts. High strength bolts for structural steel joints including suitable nuts and plain hardened washers shall meet the requirements of ASTM A 325 as amended and modified herein. High strength bolts, nuts, and washers used with weathering steel shall be Type 3. 2.4.2.1.1 When high strength galvanized bolts are specified, they shall conform to ASTM B 695 Class 50 for mechanically-deposited galvanizing. Use galvanized fasteners where structural steel is painted. 2.4.2.1.2 The use of ASTM A 490 bolts will not be permitted without authorization by the Administrator, Bureau of Bridge Design. 2.4.2.2 Nuts. Nuts shall conform to ASTM A 563. 2.4.2.3 Washers. All washers shall be hardened steel and shall conform to ASTM F 436 and these specifications. 2.4.2.4 Direct Tension Indicators (DTI). All DTI’s shall conform to the requirements of ASTM F 959 Type 325, except that DTI's shall not exceed Rockwell hardness C35. The DTI supplier shall certify that testing has been performed on equipment required by ASTM F 959. 2.4.2.4.1 DTI's shall be furnished “ galvanized” (i.e. mechanically zinc coated) unless noted otherwise. For use with weathering steel, DTI’s shall be furnished as weathering steel or “ painted” (i.e. mechanically galvanized and epoxy coated or baked epoxy).