SECTION 512 – SIGN SUPPORT STRUCTURES
512.01 Description
This Section describes the requirements for constructing sign support structures.
512.02 Materials
512.02.01 Materials
Provide materials as specified: Concrete ................................ ................................ ................................ ................................ ....................... 903.03 Reinforcement Steel ................................ ................................ ................................ ................................ ...... 905.01 Sign Structures ................................ ................................ ................................ ................................ .............. 906.05 Anchor Bolts ................................ ................................ ................................ ................................ ............ 908.01.03 Electrical Conduit and Fittings ................................ ................................ ................................ ...................... 918.01
512.02.02 Equipment
Provide equipment as specified: Vibrator ................................ ................................ ................................ ................................ ...................... 1005.04 Concrete Batching Plant ................................ ................................ ................................ .............................. 1010.01 Concrete Trucks ................................ ................................ ................................ ................................ .......... 1010.02
512.03 Construction
512.03.01 Sign Support Structures
A.Working Drawings. At least 30 days before beginning work, submit working drawings for certification.
B.Storage and Handling. Load, transport, unload, and erect structural materials so that the metal is kept clean and free from injury in handling. Store structural materials above the ground on platforms, skids, or other supports. Keep the structural materials free from accumulation of dirt, oil, acids, or other foreign matter.
C.Erection Plan. At least 15 days before erecting posts, tower shafts, and trusses, submit a plan to the RE showing the proposed equipment to be used. Include calculations and lift points to maintain the truss assembly in plumb position during placement, detailed erection instructions and drawings of all structures, and the proposed scheme for traffic control during the erection of the towers and trusses. Ensure that the plan includes the method to install walkways, luminaires, signs, and miscellaneous attachments within the same 8 hour period that the trusses are erected unless otherwise approved by the RE.
D.Excavating. Excavate as specified in 202.03.03. Shape and compact the underlying material to produce a firm, even surface. Obtain RE approval before finishing excavation. If the RE determines that the bottom of the excavation is unstable, undercut, backfill, and compact as directed by the RE.
E.Placing Concrete for Pedestals. Set anchor bolts into a template to maintain alignment and elevation. Secure in position to prevent displacement while placing concrete. Before placing the concrete, place reinforcement steel as specified in 504.03.01 and conduit. Ensure that concrete placement complies with the limitations specified in
504.03.02 C. Place concrete as specified in 504.03.02.D. Cure concrete as specified in 504.03.02.F.
F.Installing Electrical Material. Provide and install galvanized steel conduit ells in pedestals. Where this conduit is not to be extended to a junction box, terminate the lower end of each ell 3 feet from the face of the pedestal and 18 inches below grade, and cap with a standard galvanized steel pipe cap. Ensure the upper end of each ell projects above the pedestal for a sufficient distance to terminate at the level of the bottom of the handhole in the sign support post or tower shaft, or at a maximum of 2 inches below such level. Terminate the ell by ground bonding bushing (with closure disk in conduit not to be extended). Where a cable passes through a hole or runs along a surface at any point on the complete assembly, ensure holes and surfaces are deburred and free of sharp edges or protuberances that may damage the cable.
G.Erecting Posts, Trusses, and Tower Structures. Straighten any deformed structural material before being laid out, punched, drilled, or otherwise worked on in the shop. The RE will reject structural material with sharp kinks or bends. Verify bolt alignment before erecting towers. Do not erect posts and tower shafts on the completed pedestals until the concrete has attained a strength of 3 ,000 pounds per square inch as determined from 2 concrete cylinders field cured according to AASHTO T 23. If concrete cylinders are n ot tested, or do not meet a strength of 3,000 pounds per square inch when tested, do not erect posts and tower shafts until the pe destal concrete has cured for 3 days.
1.Trusses. Connect the truss abutting chord splices according to Subsection 11.5.6 of the AASHTO LRFD Bridge Construction Specifications. Provide 2 working platforms that allow the bolt assembly tightening from opposite sides of the structure. Provide 2 impact wrenches. Sequentially tighten by initiating and progressing the tightening of the bolts in a pattern whereby a 180 degree opposite side repetition is maintained. Sequentially tighten each bolt and nut to the same calibrated increment. Install high-strength steel bolts as specified in 506.03.01.E.
2.Posts and Tower Shafts. Clean and lubricate threads of anchor bolts and nuts before installing post or tower shaft. Ensure that the top of the concrete pedestals or caissons is free of dirt or other foreign materials. Install the top and bottom bolt assemblies as shown on the Plans and set level and as specified in 506.03.01.E. After erecting the posts or tower shafts and tightening all nuts as outlined above, add a second nut to each anchor bolt and adjust snug tight. The Contractor may use self-locking nuts to maintain the connection. After installing the second nut, or self-locking nut, adjust the leveling nuts to a snug tight condition. Snug tight is defined as the tightness that exists when all surfaces on the joint are in firm contact with one another. Leave the space between the top of the pedestal and the bottom of the post open. At least 15 days before erecting VMS structures, provide 2 stainless steel mounting U -bolts per lot, to the NJDOT Bureau of Materials. Verify the location of an electrical power source in the field before foundation construction and before fabrication of the structure.
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Source: Standard Specifications for Road and Bridge Construction, 2019 (rev. 2022-12-21) Edition. Pages 294–295 of 651. View official source ↗