591 SECTION 657 ROADSIDE SIGN SUPPORTS
657.1 -DESCRIPTION : This work shall consist of the fabrication and erection of all supports for roadside mounted signs in accordance with the requirements of the Plans and of these Specifications. This shall include the supports for all signs which are located outside of the shoulder and do not extend over the shoulder. All details not specified or not shown on the Plans shall conform to the details and requirements set forth in th e following specifications and publications:
Book Vol. II, Signing, Signals, Lighting, Markings, and ITS, latest issue, including revisions (further referenced to herein as the Standard Details). ii. The Manual on Uniform Traffic Control Devices for Streets and Highways, latest issue, as printed by the Federal Highway Administration, U.S. Department of Transportation. (Referred to as the MUTCD). iii. Standard Specifications for Struct ural Supports for Highway Signs, Luminaires and Traffic Signals, 6th Edition, including revisions, American Association of State Highway and Transportation Officials.
657.2 -MATERIALS : Materials furnished sha ll be of new stock, shall be the product of reputable manufacturers of signing supports and accessories, shall conform to the Specifications, and shall meet the approval of the Engineer.
657.2.1 -Beams : Steel Beams such as shown on Standard Detail sheets TE1-3A through TE1-3C shall be standard wide flange shapes fabricated from steel conforming to ASTM A36 or ASTM A572 Grade 50. Steel conforming to ASTM A992 and dual certified to ASTM A572 Grade 50 may also be used. The beams shall be galvanized in acco rdance with ASTM A123.
657.2.2 -Plates: Flat steel plates such as stiffener plates, base plates, hinge plates, arm plates, and gusset plates shown on various Standard Detail sheets shall conform to ASTM A36 and shall be galvanized in accordance to ASTM A123.
657.2.3 -Structural Connection Bolts: Steel structural connection bolts and associated hardware shown on various Standard Detail sheets shall conform to the following requirements. Bolts: ASTM F3125 Grade A325, Type I. Nuts: ASTM A563, Grade DH with lubricant contrasting with the color of the galvanizing. Washers: ASTM F436, Type I. All galvanized in accordance to ASTM F 2329.
657.2.4 -Keeper Plates: Steel keeper plates such as shown on Standard Detail sheets TE1- 3A through TE1 -3C and TE1 -5A through TE1 -5C shall conform to ASTM A653, designation CS, and shall be galvanized. Thickness for use with Steel Beam supports shall be 20 gauge. Thickness for use with Pipe Post supports shall be 28 gauge.