7-86 provided with a wire inlet as shown on the standard details. On dual-purpose poles, a pull wire shall be provided for the luminaire.
b.Pedestal Poles Shafts shall be 4 inch nominal ID, schedule 40 pipe without splices. The length of the pole plus the base shall be 10 feet, except t hat the length of poles supporting only pedestrian heads shall be 8 feet.
c.Bridges, Cantilever, and Butterfly Type Sign Support Structu res The configuration of the foundations, bases, shafts, and trusses shall be of the Con tractor's design as approved by the Resident and shall use only material specified above.
720.04 Steel Mast Arm and Bracket Arm Material for mast arms a nd bracket arms shall
be as specified in Section 720.03. Int ernal diameters, bents, joints, and attachments shall permit internal wiring in the upper member of the arms. Arms s hall be hot dipped galvanized, both inside and outside, in conformance with AASHTO M 111. All work shall conform to the applicable provisions of Section 504 - Structura l Steel.
a.Mast Arms for Signals Mast arms may be of the single member or the truss type. Single member type mast arms shall be a single, straight or tap ered, round member and may incorporate a maximum of 2 telescopic splices. Truss type mast arms shall be of a tapered design consisting of an upper and a lower member connected by v ertical struts welded to form an integral unit. Mast arms shall be equipped with sturdy signal hangers and/or appropriate tenons for mounting the signal heads and shall have weatherproof wire inlets located close to the suspended signal heads.
b.Bracket Arms for Luminaires Bracket arms may be of the sing le member or the truss type. Single member type bracket arms shall be of the tapered u psweep design. Truss type bracket arms shall be of a tapered design consisting of an uppe r and lower member connected by a single vertical s trut, welded to form an integra l unit. Bracket arms shall be equipped with an appropriate tenon f or the attachment of the lu minaire.
720.05 High Mast Light Standard High mast light standards shal l have a cross section
that is either round or polygonal with not less than 12 sides, and shall have a uniform taper from the base to the top, except that an expanded base section may be used, if required, to accommodate the electrical and mechanical equipment. All work shall conform to the applicable provisions of Section 504 - Structural Steel. For unpainted high mast structures, material for the shaft, ba se and attachments shall conform to the requirements ASTM A 709 Grade 50W or ASTM A 595, Grade C. The base plate and reinforci ng components of high mast poles s hall be considered main load carrying members and shall comply with the requiremen ts of Table A, Section
713.01 Structural Steel. If applicable, the Contractor shall submit a proposed coating
specification for approval by the Fabrication Engineer. 7-87 A Certificate of Compliance shall be provided for all material in accordance with the requirements of the General Statement of Division 700 - Materia ls.
720.06 Steel H-beam Posts Steel H-beam Posts shall conform to the requirements of
ASTM A 992. All work shall conform to the applicable provision s of Section 504 - Structural Steel. Steel shall be hot-dip galvanized in accorda nce with AASHTO M 111. All steel hardware for use with H-beam poles shall be hot-dip galva nized in accordance with AASHTO M 232 (ASTM A 153 or B 695, Class 50, Type 1).
720.07 Anchor Bolts Anchor bolts and nuts supplied for aluminu m and/or steel
supports shall conform to ASTM A 449, Type 1, or ASTM F 1554, G rade 55, both with a minimum yield strength of 55 ksi. Anchor bolts shall be suppli ed with 2 heavy hex nuts and 2 hardened washers and unless otherwise specified the anchor bo lts shall have a 90° bend with a 6 inch minimum leg length at the lower end. The anchor bolts, nuts and hardened washers shall be hot-dip galvanized in accordance with AASHTO M 232 or AASHTO M 298 Class 50, Type 1. The bolt shall be zinc-coated 12 inches from the exposed end, unless otherwise specified. If the anchor bolts are to be used with b reakaway devices incorporating the function of a nut, for example, longitudinally grooved brea kaway couplings, nuts or washers will not be required. Alternate materials, grades, and designs may be used for the a nchor bolts subject to approval of the Engineer.
720.08 U-Channel Posts Except as otherwise authorized, Rib Ba ck U-Channel posts
for signs of less than 4 ft² in area, shall be fabricated of st eel weighing 2.5 lb/ft, and shall not be doubled-up. Aluminum U-channel posts having the same streng th characteristics and shape as steel U-channel posts may be used, subject to the appr oval of the Resident. The steel U-channel posts shall be powder coat green in accordance with AASHTO M 111.
720.09 Wood Ornamental Light Standard Material for wood light standards shall be
Western Red Cedar (Rhuja Plicata) or other species with equal o r better decay resistance, approved by the Resident . The wood cross section shall be 10 by 10 inches minimum. The m ounting height and depth of burial shall be as shown on the plans. The following items shall be supplied, a 2 inch slipfitter of corrosion resistant material of adequate length to support the luminaire, a sideplo wed wire-way covered by a suitable flush filler strip to accommodate three, number 12 con ductors, a pair of two-piece plinths for conduit entrance and splice box. All bolts shall be hot-dip galvanized in accordance with AASHT O M 232 or AASHTO M 298 Class 50, Type 1. All parts of the wood light standard shall be prefitted and pr edrilled, holes shall be counterbored to conceal bolts and filled with mastic compound.
Source: Maine Standard Specifications for Road and Bridge Construction, 2020 Edition. Pages 791–792 of 817.