730  TRAFFIC SIGN AND SUPPORT MATERIAL

730.01  Steel Tube and Pipe.  Furnish steel tube and pipe according to ASTM A 53, Grade B or ASTM A 501, except provide tubing for truss and end frame diagonals according to 711.01.

730.015  U-Channel Posts.  Furnish U-channel posts fabricated from steel into a characteristic cross-section that may be used alone or paired to form a heavier post by being bolted together back to back.  Furnish posts with a uniform cross section for their full length.  Cut posts square to a length tolerance Ī1 inch (Ī25 mm) and ensure that posts do not have ragged or sharp edges, or cracks or other imperfections affecting strength or durability.  The back of the posts may be flat or contain raised longitudinal ribs.

Furnish posts meeting the deflection criteria of Supplement 1075.  Furnish posts manufactured from rail or billet steel according to ASTM A 499, Grade 60.

Furnish posts with a nominal weight before punching or galvanizing as follows:

Post Size Number

Weight  lb/ft (kg/m)

Tolerances %

1

1.12 (1.7)

-3.5, +10.0

2

2.00 (3)

-3.5, +10.0

3

3.00 (4.5)

-3.5, +10.0

 

Furnish posts with 3/8-inch (10 mm) diameter holes accurately punched on the centerline spaced at 1-inch (25 mm) centers beginning not more than 1 1/8 inches (30 mm) from the top of the post through the entire length, to allow bolting the posts back to back, without redrilling, using 5/16-inch (8 mm) diameter bolts.  Furnish posts that have been galvanized after punching according to 711.02.

Furnish materials according to the Departmentís Qualified Products List (QPL).

730.016  Square Posts.  Furnish square posts fabricated from steel according to ASTM A 1011 with a minimum yield strength of 60,000 pounds per square inch (415 MPa), with 7/16-inch (11 mm) diameter die-cut knockouts or open holes spaced on 1-inch (25 mm) on the centerline of all four sides, in true alignment and opposite each other.  Furnish posts with the dimensional requirements conforming to the Departmentís standard drawings.  Furnish posts that have been finished with one of the following methods:

A.      Both inside and outside of the post are hot-dip galvanized according to ASTM A 653 G-235.

B.      The outside of the post has a zinc coating of 0.80 ounce per square foot (244 g/m2) followed by chromate conversion coating and a cross-linked polyurethane acrylic coating.  The inside of the post has a zinc organic coating.

Furnish materials according to the Departmentís Qualified Products List (QPL).

730.017 Wooden Box Beams.  Furnish wooden box beams fabricated from 1/10 or 1/8 inch (2.54 or 3.18 mm) thick laminated veneers with the grain oriented parallel to the length of the finished beam and the veneers glued together in a continuous process with lap or scarf joints connecting successive veneers in each layer staggered throughout the thickness of the beam.  A 45 degree miter shall be used for the corner joints.  The adhesive used shall be a phenol-formaldehyde which conforms to ASTM D 2559.  The beams shall be pressure treated with a pentachlorophenol preservative meeting AWPA Standard C33, with a minimum preservative retention of 0.60 lb/ft3 (9.6 kg/m3) of pentachlorophenol.

730.02  Steel Anchor Bolts and Nuts.  Furnish anchor bolts made of steel conforming to ASTM F1554 Grade 105, galvanized according to 711.02 at least 2 inches (50 mm) beyond the threads, with the end either bent or with a drilled and tapped steel plate.  Furnish leveling nuts and anchor nuts capable of developing the full strength of the anchor bolt.

Furnish materials according to the Departmentís Qualified Products List (QPL).

730.03  Steel Poles and Arms.  Furnish poles and arms made of steel with a minimum yield strength of 52,000 pounds per square inch (359 MPa) and galvanized according to 711.02.

Furnish certified material according to Supplement 1093

730.04  Base and Arm Plates.   Furnish support or pole anchor bases and arm attachment plates fabricated from steel plate according to ASTM A 36 (A 36M) or ASTM A 572 (A 572M), Grade 42.  Weld plates to supports, poles, or arms both inside and outside with fillet or full penetration welds equal to the wall thickness, or by AWS prequalified welding joints TC U4a-S or TC U4c-GF.  The Contractor may use a cast steel base of equivalent strength.

Furnish certified material according to Supplement 1093.

730.05  Handhole Covers.  Furnish handhole covers for poles and overhead sign supports made of 0.109-inch (2.7 mm) galvanized steel or 0.125-inch (3 mm) nominal aluminum alloy.

Furnish certified material according to Supplement 1093.

730.06  Pole Caps.  Furnish pole caps made of aluminum, galvanized ferrous metal, or zinc die casting.

Furnish certified material according to Supplement 1093.

730.07  Arm Caps.  Furnish arm caps made of steel that cover at least 50 percent of the end area.

Furnish certified material according to Supplement 1093.

730.08  Steel Hardware.  Furnish bolts 5/8-inch (16 mm) diameter or larger according to ASTM A 325 (A 325M).  Furnish bolts and screws less than 5/8-inch (16 mm) diameter according  to SAE J429, Grade 5.  Furnish nuts of all size, except anchor nuts and leveling nuts, according to SAE J995, Grade 2.  Furnish flat washers according to ANSI B18.22.1.  Furnish lock washers according to ASME B18.21.1.  Furnish U-bolts according to ASTM A 307.  Furnish all hardware that is hot-dipped galvanized according to ASTM A 153 or mechanically galvanized according to ASTM B 695, Class 50.

Furnish certified material according to Supplement 1092 or 1093.

730.09  Stainless Steel.  Furnish any AISI 300 or 400 series stainless steel.

Furnish certified material according to Supplement 1093.

730.10  Stainless Steel Hardware.  Furnish stainless steel hardware according to ASTM A 320/A 320M (AISI 300 series).  Furnish bolts, screws, nuts, washers, handhole cover chains, and U-bolts that are passivated commercial grade.

Furnish certified material according to Supplement 1092 or 1093.

730.11  Aluminum Sheet and Plate.  Furnish sheets for extrusheet panels according to ASTM B 209 (B 209M), 3003-H18, or 5052-H38.  Furnish sheets for flat sheet and overlay signs, and sign post reflectors, according to ASTM B 209 (B 209M), 3004-H38, 5052-H38, or 6061-T6.  Furnish plates for sign support structures according to ASTM B 209 (B 209M), 6061-T6.

Furnish certified material according to Supplement 1092 or 1093.

730.12  Aluminum Extrusions.  Furnish extruded panels and extrusions for extrusheet panels according to ASTM B 221 (B 221M), 6063-T6.  For sign support structures, provide rolled or cold finished bar, rod, and wire according to ASTM B 211 (B 211M), 6061-T6; provide extruded bars, rods, shapes, and tubes according to ASTM B 221 (B 221M), 6061-T6.

Furnish certified material according to Supplement 1092 or 1093.

730.13  Aluminum Tube and Pipe.  Furnish seamless pipe and seamless extruded tube according to ASTM B 241/B 241M, 6061-T6.  Furnish extruded structural pipe and tube according to ASTM B 429, 6061-T6.

Furnish certified material according to Supplement 1092 or 1093.

730.14  Aluminum Castings.  Furnish sand castings according to ASTM B 26/B 26M, 356-T6 or T7.  Furnish permanent mold castings according to ASTM B 108, 356-T6 or T7.

Furnish certified material according to Supplement 1092 or 1093.

730.15  Aluminum Forgings.  Furnish forgings according to ASTM B 247 (B 247M), 6061-T6.

Furnish certified material according to Supplement 1092 or 1093.

730.16  Aluminum Welding Rods.  Furnish welding rods according to AWS ER-4043.

730.17  Aluminum Hardware.  Furnish hardware according to:

 

ASTM Designation

Alloy

Condition/Temper

Bolts and screws

B 211 (B 211M)

2024

6061

T4

T6

Studs-welded

B 211 (B 211M)

1100

H16

Nuts-hex

B 211 (B 211M)

6061

6262

T6

T9

Nuts-lock

B 211 (B 211M)

2017

T4

Washers-flat

B 209 (B 209M)

Clad 2024

6061

T4

T6

Lock washers

B 211 (B 211M)

7075

T6

Rivets-solid

B 316/B 316M

6053

6061

T6

T6

Rivets-blind

B 316/B 316M

2017

2117

5052

F

F

F

 

In addition, provide break-mandrel aluminum blind rivets with a stainless steel or aluminum mandrel.

Furnish certified material according to Supplement 1092.

730.18  Reflective Sheeting Type F.   Furnish sheeting according to ASTM D 4956, Type I, including supplemental requirement S1.

730.19  Reflective Sheeting Type G.  Furnish Type G reflective sheeting according to Supplement 1049, and according to ASTM D 4956, Type III or IV, including supplemental requirement S1.

Furnish materials according to the Departmentís Qualified Products List (QPL).

730.191 Reflective Sheeting Reboundable.  Furnish reboundable reflective sheeting according to Supplement 1049, and according to ASTM D 4956, Type III, IV, VIII, IX or XI, including supplemental requirements S1 and S2, with watermarks or other identification marks inconspicuously incorporated into the face of the sheeting on a repeating pattern if necessary to distinguish the sheeting from other similarly appearing sheetings.

Furnish materials according to the Departmentís Qualified Products List (QPL).

730.192  Reflective Sheeting Type H.  Furnish Type H reflective sheeting according to Supplement 1049, and according to ASTM D 4956, Type VIII including supplemental requirement S1.

Furnish materials according to the Departmentís Qualified Products List (QPL).

730.193  Reflective Sheeting Type J.  Furnish Type J reflective sheeting according to Supplement 1049, and according to ASTM D 4956, Type IX or XI, including supplemental requirements S1.

Furnish materials according to the Departmentís Qualified Products List (QPL).

730.20  Nonreflective Acrylic Opaque Sheeting.  Furnish non-reflective acrylic opaque sheeting according to ASTM D 4956, except provide sheeting that does not incorporate any optical elements.

 730.22 Silk Screen Inks.  Furnish opaque and transparent process color inks used in the silk screen process that the manufacturer of the reflective sheeting accepts and warrants according to Supplement 1049.  Use inks that provide a tough, durable film of uniform thickness and appearance on the sign surface.  Furnish transparent process color inks used in the reverse screen process according to the Daytime Color Specification Limits table in ASTM D 4956.

730.23  Transparent Acrylic Electronic Cuttable Films.  Furnish transparent acrylic electronic cuttable films the manufacturer of the reflective sheeting warrants according to Supplement 1049.  Use films that provide a uniform appearance on the sign surface.  Furnish films according to the Daytime Color Specification Limits table  in ASTM D 4956.