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.
592 657.2.5 -Brass Shims: Brass shims such as shown on Standard Detail sheets TE1 -3A through TE1 -3C and TE1 -5A through TE1 -5C shall be fabricated from brass shim stock or strip meeting ASTM B36.
657.2.6 -Pipe: Steel pipe such as shown on Standard Detail sheets TE1 -5A through TE1- 5C shall conform to the requirements of ASTM A53, TYPE E or S, Grade B.
657.2.7 -Friction Caps: Steel friction caps such as shown on Standard Detail sheets TE1- 5A through TE1 -5C shall conform to ASTM A653, designation CS, and shall be zinc electrodeposited coated in accordance with ASTM B633, Class 12.
657.2.8 -Anchor Bolts: Anchor bolts for cast -in-place applications such as shown on Standard Detail sheets TE1 -5A through TE1 -5C and TE2 -2 shall conform to the following requirements. Bolts: ASTM F1554 Grade 55. Nuts: ASTM F563 Grade A. Washers: ASTM F436. All galvanized in accordance with ASTM B695.
657.2.9 -Low Carbon Steel Bolts: Small diameter, typically 5/16 -inch, low carbon steel bolts and associated components shown on various Standard Detail sheets shall conform to the following requirements. Bolts: ASTM A307 Grade A. Nuts: ASTM A563A Hex. Flat washers: ASTM F844. Lock washers: ASME B18.21.1. All galvanized in accordance to ASTM F2329.
657.2.10 -Tubular Steel: Tubular steel such as shown on Standard Detail sheets TE2 -1A through TE2 -1B and TE2 -3 shall conform to ASTM A500, Grade B, seamless or welded. Galvanized in accordance to ASTM A123.
657.2.11 -U-Channel Supports and Breakaway Splice Devices: U-channel su pports utilized shall be listed on the Division Approved Products List (APL) for U -Channel Posts. MP 707.02.13 shall be followed. When required, Breakaway Splice Devices shall be supplied with the u -channel supports; such as shown on Standard Detail TE1 -7B.
657.2.12 -Square Tube Supports: Square tube supports shall conform to the requirements of subsection 709.53.
657.2.13 -Omni -Directional Breakaway Devices: Omni -Directional Breakaway Devices shall be designed for use with Steel Beam supports sho wn on Standard Detail sheets TE1 -3A, TE1-3B, and TE1 -3C. When required in the project plans, Omni -Directional Breakaway Devices shall be utilized with specified Steel Beam type support assemblies in order to convert the breakaway connection from bi -direct ional to omni -directional. The device used shall be listed on the WVDOH Approved Products Listing (APL) for Roadside Sign Support Accessories. Omni -Directional Breakaway Devices shall conform to requirements of 709.52.
657.2.14 -Back to Back U -Channel B reakaway Devices: Back to Back U -Channel Breakaway Devices shall be designed for use with 4 -lb/ft and/or 6 -lb/ft back to back supports shown on Standard Details sheets TE1 -7A and TE1 -7B. When required in the project plans, Back to Back U -Channel Breakawa y Devices shall be utilized with specified back to back support assemblies in order to create a breakaway base connection.
593 The device used shall be listed on the WVDOH Approved Products Listing (APL) for Roadside Sign Support Accessories. Back to Back U -Channel Breakaway Devices shall conform to subsection 709.54.
657.2.15 -Surface Mount Breakaway Devices: Surface Mount Breakaway Devices shall be designed for use with 2 -lb/ft and/or 3 -lb/ft u -channel supports shown on Standard Details sheets TE1 -7A and TE1-7B, and/or 2” x 14 -gauge Square Tube Supports. When required in the project plans, Surface Mount Breakaway Devices shall be utilized with specified u -channel support assemblies which are located on asphalt or concrete surfaces. The Contractor shal l select the Surface Mount Breakaway Device to be used following the guidance on Standard Detail TE1 -7B. The device used shall be listed on the WVDOH Approved Products Listing (APL) for Roadside Sign Support Accessories. Surface Mount Breakaway Devices shall conform to subsection 709.51. A complete anchoring system for securing the device on the asphalt or concrete is also required.
657.2.16 -Types A and B Barrier Wall Sign Support Brackets: Types A and B Barrier Wall Sign Support Brackets shall be designed for use with 2 -inch x 14 -gauge Square Tube Supports. When required in the project plans, Types A and/or B brackets shall be utilized with specified assemblies to be installed on top of a median barrier wall or parapet. Type A brackets are intended to be specified for use with barriers less than ten (10) inches in width at the top. Type B brackets are intended to be specified for use with barriers ten (10) inches or greater in width at th e top. A complete anchoring system for connecting the bracket to the concrete and hardware for connecting the square tube support to the bracket are required. The bracket used shall be listed on the WVDOH Approved Products Listing (APL) for Roadside Sign Support Accessories. The requirements for Types A and B Barrier Wall Sign Support Brackets are specified in subsection 709.55.
657.2.17 -Anchors for Brackets: It shall be the responsibility of the bracket fabricator to select and specify an approp riate anchoring system for retrofit installations of the following sign brackets: Types C and D Barrier Wall Sign Support Brackets as shown on Standard Detail sheets TP3 -2 and TE2 -3; Types K and L Bridge or Retaining Wall Sign Mounting Brackets as shown on Standard Detail sheets TE2 -1A, TE2 -1B, and TE2 -2. Mechanical or chemical anchoring systems may be used. The anchors and associated hardware components of the anchoring system shall be galvanized steel. The anchoring system shall be selected based on the design loading information provided on the previously referenced Standard Detail sheets. It shall be the fabricator’s responsibility to verify the dimensions of the barrier, parapet, or retaining wall if necessary in order to select the anchorin g system. All specifications and details related to the anchoring system shall be included as part of the fabricator’s shop drawings. All necessary materials to install the anchoring system shall be provided by the fabricator with the bracket.
657.2.18 -Concrete: All concrete shall be Class B in accordance with Section 601.
657.2.19 -Reinforcing Steel: All reinforcing steel shall be meet the requirements of
594 CONSTRUCTION METHODS
657.3 -FABRICATION : 657.3.1 -General: Fabrication of all parts of supports shall be in accordance with dimensions shown on the Plans and Standard Drawings. Work shall be done in a uniform workmanlike manner.
657.3.2 -Shop Drawings: The Contractor shall submit Shop Drawings showing all dimensions, quantities, and fabrication details for all supports and brackets for the Engineer’s approval. All associated accessories and hardware to be supplied with the supports and brackets shall b e included, including details and specifications for retrofit anchors as described in Section 657.2.17. Eight copies of the Shop Drawings shall be submitted. Multiple submissions will be permitted. However, all Shop Drawings for Steel Beam Supports shal l be submitted in one submission; all Shop Drawings for Pipe Post Supports shall be submitted in one submission; and all Shop Drawings for Parapet, Retaining Wall, and Barrier Brackets shall be submitted in one submission.
657.3.3 -Structural Bolt Tighte ning: When fully tightening structural connection bolts as part of the shop fabrication process, only un -weathered hardware components in new condition shall be used. All nuts shall be pre -coated with a lubricant as specified herein. After pre - assembly of the connections, the bolts shall be brought to a “snug tight” condition. Prior to snug tightening the nuts, if the threads of the bolts have not been lubricated, were last lubricated more than twenty -four hours prior, or have gotten wet since they were last lubricated, lubricant shall be applied to the bolt threads. Beeswax or toilet ring wax may be used. The assembler may turn the nuts while holding the heads of the bolts or vice versa. If the heads of the bolts are turned, the assembler shall apply lubricant to the face of the washer that the bottom of the bolt head is to be tightened against. The bolts shall be snug tightened in a star pattern. “Snug Tight” condition is defined by the Research Council on Structural Connections (RCSC) as “the ti ghtness that is attained with a few impacts of an impact wrench or the full effort of an ironworker using an ordinary spud wrench to bring the plies into firm contact”. After the snug tightening process, no less than seventy -five percent (75%) of the su rface areas of the faces being connected should be in visible contact. The assembler shall take care during the snug tightening process to ensure that components being assembled remain properly aligned, loosening the connection and repeating the snug tigh tening process if necessary. After the snug tightening process has been completed, each nut or bolt head shall be fully tightened by the turn -of-the-nut method. This shall require further tightening each fastener one-third (⅓) of a turn, which shall be equivalent to two flats of a typical nut or bolt head with five flats. This shall be verifiable by first marking the nut or bolt head on one of the flats and placing a corresponding mark on the component two flats away. The fasteners shall be fully tightened in a star pattern and incrementally by fully tightening each over at least two cycles.
657.3.4 -Welding: The welding of steel shall be in accordance with the requirements of American Welding Society Specification D1.1 and shall be done by qualified welders.