T-20-16 Tubular Metal Posts and Anchor Specs~1.pdf

STATE OF ILLINOIS

DEPARTMENT OF TRANSPORTATION

SPECIFICATION FOR TUBULAR METAL POSTS, ANCHORS AND

OMNI DIRECTIONAL ANCHORS/SLEEVES

FOR HIGHWAY SIGNS

T-20-16

MATERIAL: Posts, anchors and omni directional anchors/sleeves manufactured from 12 gauge material shall conform to the Standard Specification for either Steel Sheet, Zinc-Coated

(Galvanized) by Hot-Dip Process, Structural Quality, ASTM A 653, Grade 40 or Steel Sheet, Carbon, Hot-Rolled, Structural Quality ASTM A 1011, Grade 40. Posts and anchors manufactured from 14 gauge material shall conform to the Standard Specification for Steel

Sheet, Zinc-Coated (Galvanized) by Hot-Dip Process, Structural Quality, ASTM A 653, Grade

50, or Steel Sheet, Carbon, Hot-Rolled, Structural Quality, ASTM A 570, Grade 50.

SHAPE: The cross section of post, anchors, and omni directional anchors/sleeves shall be carefully formed square tubing, welded in one corner and sized to permit telescoping internally or externally.

SECTION PROPERTIES: All anchors and posts shall meet the following:

Anchors and Omni Directional Anchors/Anchor Sleeves (post component)

U.S.S. Min. Yield Weight Per

Size Gauge Strength Foot, Pounds

2”x2” 12 40,000 psi 2.42

2-1/4”x2-1/4” 12 40,000 psi 2.77

2-1/2”x2-1/2” 12 40,000 psi 3.14

Posts

U.S.S. Min. Yield Weight Per

Size Gauge Strength Foot, Pounds

1-1/2”x1-1/2” 12 40,000 psi 1.70

1-3/4”x1-3/4” 12 40,000 psi 2.06

2”x2” 12 40,000 psi 2.42

2-1/4”x2-1/4” 12 40,000 psi 2.77

2-1/2”x2-1/2” 12 40,000 psi 3.14

1-3/4”x1-3/4” 14 60,000 psi 1.71

2”x2” 14 60,000 psi 1.99

2-1/4”x2-1/4” 14 60,000 psi 2.27

2-1/2”x2-1/2” 14 60,000 psi 2.55

HOLES: Holes shall be fully perforated 7/16” diameter plus or minus 1/64” on 1” centers, on all four sides of post or post component. Holes shall be full length of posts truly aligned to center of a side and exactly opposite each other on opposing sides. Holes shall maintain a plus or minus tolerance of 1/8” in 60” of length.

LENGTH: The length of each post or anchor/sleeve shall be as specified with a permissible tolerance of plus or minus 1/4” overall.

TELESCOPING PROPERTIES: The finished anchor/sleeve and post shall be straight and have a smooth uniform finish. It shall be possible to telescope all consecutive sizes of square tubing freely for at least the length of the anchor without having to match any particular face to any opposing face. All holes and ends shall be free from burrs, ends shall be cut square and anchors shall always be cut exactly between two holes to ensure bolt alignment when reinforcing anchors/sleeves are used.

TOLERANCES: Tolerances on outside sizes:

Nominal Outside Dimensions Outside Tolerances at all Sides at Corners

1-1/2” x 1-1/2” plus or minus .006"

1-3/4” x 1-3/4” plus or minus .008"

2” x 2” plus or minus .008”

2-1/4” x 2-1/4” plus or minus .010”

2-1/2” x 2-1/2” plus or minus .010”

Note: Measurements for outside dimensions shall be made at least 2” from end of tube.

Wall Thickness Tolerance: Permissible variation in wall thickness is plus .011”, minus .008”.

Convexity and Concavity: Measured in the center of the flat side tolerance is plus or minus

0.01” applied to the specific size determined at the corner.

Nominal Outside Dimensions Squareness Tolerance Twist Permissible in 3’ Lengths

1-1/2”x1-1/2” plus or minus .009” .050”

1-3/4” x 1-3/4” plus or minus .010” .062”

2” x 2” plus or minus .012” .062”

2-1/4” x 2-1/4” plus or minus .014” .062”

2-1/2” x 2-1/2” plus or minus .015” .075”

Note: A sample shall be considered to fail if its sides are not 90 degrees to each other by the tolerance listed above.

Straightness Tolerance: Permissible variation in straightness is 1/16” in three feet.

Corner Radii: Standard outside corner radius shall be 5/32” plus or minus 1/32 of an inch.

FINISH: The square sign post, anchors and omni directional anchor/sleeve tubing shall be manufactured from hot dipped galvanized steel according to AASHTO M 111, or given triple coated protection by in-line application of hot-dip galvanized zinc per

AASHTO M 111 followed by a chromate conversion coating and a crosslinked polyurethane acrylic exterior coating. The inside surfaces shall be given corrosion protection by in-line application of a full zinc base organic coating after fabrication, tested in accordance with ASTM B-117. If weld process is performed after galvanizing, weld shall be zinc coated after scarfing operation.

PACKAGING: Posts shall be securely bundled with 4 or more steel straps and shall weigh approximately 2,000 lbs. per bundle.

Omni directional anchors shall be shipped in bundles on pallets. Omni directional anchor sleeves shall be shipped in containers.

This specification supersedes T-20-15.

Effective December 2016.