521BEARINGS

521.01 Description. This work shall consist of furnishing and installing

bearings.

521.02 Materials. Materials shall be according to the following.

Item Article/Section

521.03 Metal Bearings. Metal bearings and metal bearing components shall

be fabricated according to Section 505. Exposed surfaces and other portions of the structural steel bearing plates shall be painted according to Article 506.09. During cleaning and painting, the stainless steel and PTFE sheet sliding surfaces and elastomers shall be protected from abrasion and paint.

521.04 Shipping and Handling. The bearing assemblies shall be furnished

as a complete unit from one manufacturing source. Bearing assemblies shall be furnished, packaged, and handled in such a manner that the bearing assembly will be protected from damage.

521.05 Setting of Bearings. Fixed and expansion bearings on concrete shall

be set level and not be placed upon areas that are improperly finished, damaged, or irregular. The concrete under each bearing shall be finished smooth and level, within 1/8 in. (3 mm) of the specified elevation before the bearings are placed. The location of expansion bearings shall correspond with the temperature at the time of erection. Leveling plates, pads, and/or adjustment shims shall be placed as shown on the plans. Bearing plates to be cast into concrete superstructures shall be secured in the proper position, and all wedges or blocking used to position expansion bearings shall be removed as soon as practicable after the concrete is placed.

521.06 Anchor Bolts, Rods, and Side Retainers. Anchor bolts and rods

shall be hot-dip galvanized. Side retainers shall be painted or hot-dip galvanized according to Article 506.09. Anchor rods shall be drilled and set according to Article 509.06, except where anchor bolts are cast into the concrete. Before setting anchor rods with chemical adhesive, hole depths and diameters in the concrete will be verified. Holes shall be kept dry and shall be blown clean prior to installing the anchor rods. Art. 521.06 Bearings After the anchors are installed, the upper end will be checked to verify proper embedment. Anchor lengths shall leave the exposed end projecting between 1/2 in. (13 mm) and 2 in. (50 mm) above the top of the nut. Nuts for anchors in non-moving elements shall be installed snug tight by a few impacts of an impact wrench or the full force of a worker using an ordinary spud wrench. The nuts on anchors through moving parts at expansion bearings shall be adjusted to provide clearance as shown on the plans. All side retainers shall be secured in place prior to forming the bridge deck.

521.07 Work Under Separate Contracts. When the fabrication and erection

of elastomeric bearings and other collateral work are accomplished under separate contracts, the requirements of Article 505.09 shall apply.

521.08 Method of Measurement. Elastomeric bearings will be measured for

payment as each. When paid for as a separate item, steel bearings, will be measured for payment as each. Each will be defined as one complete bearing assembly. When paid for as a separate item, anchor bolts will be measured for payment as each. Each will be defined as an anchor bolt assembly which shall include all washers, nuts, and chemical adhesive necessary to install one anchor bolt.

521.09 Basis of Payment. Elastomeric bearings fabricated and erected

under a single contract will be paid for at the contract unit price per each for ELASTOMERIC BEARING ASSEMBLY, of the type specified. Elastomeric bearings fabricated under a separate contract will be paid for at the contract unit price per each for FURNISHING ELASTOMERIC BEARING ASSEMBLY, of the type specified. Storage and care of fabricated elastomeric bearings by the fabrication Contractor beyond the specified storage period, will be paid for at the contract unit price per calendar day for STORAGE OF ELASTOMERIC BEARING ASSEMBLIES when a pay item is provided for in the contract, or will be paid for according to Article 109.04 when a pay item is not provided for in the contract. Elastomeric bearings erected under a separate contract will be paid for at the contract unit price per each for ERECTING ELASTOMERIC BEARING ASSEMBLY, of the type specified. When an elastomeric bearing is requested by the Department for testing, the furnishing and delivering of the additional bearing assembly will be paid for according to Article 109.04. When steel bearings are paid for separately, this work will be paid for at the contract unit price per each for STEEL BEARING ASSEMBLY. When paid for as a separate item, anchor bolts will be paid for at the contract unit price per each for ANCHOR BOLTS, of the diameter specified. Retaining Walls Art. 522.03 SECTION 522. RETAINING WALLS

522.01 Description. This work shall consist of furnishing and constructing the

retaining wall system(s), as specified to the lines, grades, and dimensions shown on the plans and as directed by the Engineer. This work also includes the preparation of design computations and shop drawings when required for the various retaining walls specified herein.

522.02 Materials. Materials shall be according to the following.

Item Article/Section

522.03 General. Structure excavation shall be according to Section 502, cast-

in-place concrete work shall be according to Section 503, structural steel fabrication and installation shall be according to Section 505, driving of piling shall be according to Section 512, and construction of drilled shafts shall be according to Section 516.

BEARINGS in other states

• Alaska 720 · BEARINGS
• Louisiana 814 · Bearings
• Maryland 432 · Bearings
• Maine 523 · Bearings