SECTION 543: METAL RAILING
543.1 Description
This Work consists of providi ng and placing metal railing.
543.2 Materials
543.2.1 Steel Railings
Unless otherwise shown in the Contract, the Contractor shall pr ovide railing in accordance with ASTM A 36 or AASHTO M 270, Grade 50. The Contractor shall provide square or rectangular tube steel i n accordance with ASTM A 500, Grade B or ASTM A 501. The Contractor shall provide black, seamless steel pipe in acco rdance with ASTM A 53. Hydrostatic testing is not required.
543.2.2 Bolts
543.2.2 1 Anchor Bolts
The Contractor shall provide anchor bolts in accordance with AS TM A 325, ASTM A 449, ASTM F 1554 or fabricate alternatively from AISI C-1144 or AISI C-1045 steel bar. The Contractor shall hot dip galvanized anchor bolts in accordance with AASHTO M 232 or mechanically galvanize in accordance with ASTM B 695, Class 50. The Contractor shall provide heavy hex nuts in accordance with ASTM A 563 Grade DH. The Contractor shall provide washers in accordance with ASTM F 436. If the anchor bolts are fabricated from AISI C1144 or C1045 ste el bar, the manufacturer shall supply certifications that demonstrate the anchor bolts m eet the strength requirements of ASTM F 1554.
543.2.2 2 Connection Bolts
The Contractor shall provide c onnection bolts in accordance wit h ASTM A 307, Grade A; connection nuts in accordance with ASTM A 563, Grade A; connect ion washers in accordance with ASTM F 844, unless otherwise noted on the Plans or Standar d Drawings. The Contractor shall ensure that bolt dimensions are in accordance with ANSI B 18.2.1, and nut dimensions are in accordance with ANSI B 18.2.2. The Contractor shall ens ure washer dimensions and tolerances are in accordance wi th Section 542.2.3, “Washers.”
543.2.3 Caulking Compound
The Contractor shall use cold-applied, single component, chemic ally curing silicone joint sealant for concrete pavement ( non sag). Sealant shall conform to ASTM D5893, Type NS.
543.3 Construction Requirements
The Contractor shall fabricate, weld, and erect railing in acco rdance with Section 541, “Steel Structures.” For purposes of impact testing, the Department considers steel Bridge railings and posts as main members. The Contractor shall submit railing shop drawings and erection Plans in accordance with Section 541.3.3, “Shop and Erection Drawings.”
543.3.1 Erection Tolerances
For a Bridge on a tangent, the Contractor shall ensure the rail ing is visually straight. In general, the Contractor shall ensure that the railing does not deviate more than 3/8 inch within 20 horizontal feet. For a Bridge on a curve, the Contractor shall not deviate more than 13/16 inch from the curve within 20 horizontal feet. The Contractor shall ensure the rail posts are plumb within 1/4 inch over the full height.
543.3.2 Protective Coating
When the Contract specifies the railing to be colored, the Cont ractor shall powder coat the railing in accordance with Section 545, “Protective Coating s of Miscellaneous Structural Steel,” unless otherwise specified in the Contract. When the Contract specifies rai ling to be galvanized, the Contr actor shall galvanize in accordance with AASHTO M 111.
543.3.3 Cutting Rail Posts
The Contractor shall bevel cut posts to compensate for Roadway grade, crown, and superelevation. If the Roadway grade is less than or equal to one percent (1%), the Contractor shall fabricate rail posts perpendicular to the grade line, but bevel cut crown and superelevation where necessary.
543.3.4 Caulking Rail Post Base Plates
Before placing rail posts into position on a Bridge deck, the C ontractor shall apply a full circle bead of caulking compound on the deck surface around eac h of the anchor bolts. After erecting and coating the Bridge railing, the Contractor shall a pply a bead of caulking compound around the perimeter of each rail-post base plate. Th e Contractor shall clean the deck surface and the surface of the rail-post anchor plates bef ore applying the caulking compound.
543.4 Method of Measurement
The Department will measure in place metal railing from end to end.
543.5 Basis of Payment
Pay Item Pay Unit Metal Railing Linear Foot
543.5.1 Work Included in Payment
Section 543: Metal Railing Page 516 The following Work and items will be considered as included in the payment for the main item(s) and will not be measured or paid for separately: 1. Submittals; nondestructive test ing; protective coatings; 2. Additional weight of heavier sections provided solely for th e Contractor’s convenience; and 3. All Incidentals necessary for the completion of the Work. Section 544: Protective Coating Of New Structural Steel Page 5 17