B-24892 REVISED IDOT Specs - Steel Tubular Posts 211110~1.docx
DOCX document 17 KB Posted
- Attached to
- JPMC Steel Tubular Posts
- Solicitation number
- 22-416CMS-BOSS4-B-24892
- Issued by
- Illinois
About this file
This document is a specification from the Illinois Department of Transportation (IDOT) for tubular metal posts, anchors, and omni-directional anchors/sleeves for highway signs. The specification outlines the material, shape, length, and finish requirements for the posts and anchors, which must conform to ASTM standards. The posts and anchors are required to have a smooth galvanized finish and meet specific dimensional tolerances. The specification supersedes a previous version and is effective as of November 2021.
The related state and local contract opportunity is for the procurement of these steel tubular posts, which will be utilized in Illinois. The contract details are not provided, but the specification indicates that the posts shall be securely bundled and shipped in approximately 2,000 lb bundles, while the omni-directional anchors and sleeves shall be shipped in bundles on pallets and containers, respectively.
View the file
Other files
Show all 11
On GovTribe
Work with this file
- Download the original file
- Contacts named in this file
- Similar government files
- Ask GovTribe AI about this file
Text version
STATE OF ILLINOIS
DEPARTMENT OF TRANSPORTATION
SPECIFICATION FOR TUBULAR METAL POSTS, ANCHORS, AND
OMNI DIRECTIONAL ANCHORS/SLEEVES
FOR HIGHWAY SIGNS
T-20-21a
MATERIAL:
Posts shall be a square tube formed of 12 gauge steel according to the standard specification for either Steel Sheet, Zinc-Coated (Galvanized) by Hot-Dip Process ASTM A 653 or Steel Sheet, Carbon, Hot Rolled ASTM A 1011. The post shall be formed to size and, if necessary, shall be welded in such a manner that weld or flash shall not interfere with telescoping. Holes 7/16 ± 1/64 in. will be spaced on 1 in. centers on at least two opposite sides. The holes shall align to accept a 3/8 in. bolt through the post at any location. The post shall have a smooth galvanized finish applied either before or after forming.
The following tolerances will be permitted:
The nominal outside dimension will not vary more than ±0.008 in. (± 0.10 in. for the 2 1/4 in. Size) from the dimension stipulated. The wall thickness will not vary more than +0.011 to -0.008 in. from the standard 12 gauge plate thickness. The maximum allowable twist in a 3 ft length and the permissible variation in squareness shall be as shown in the following table.
Post Size Squareness Twist:
| Post Size |
| Squareness |
| Twist |
| 1 ¾ x 1 ¾ in |
| ±0.010 in |
| 0.062 in |
| 2 x 2 in |
| ±0.012 in |
| 0.062 in |
| 2 ¼ x 2 ¼ in |
| ±0.014 in |
| 0.062 in |
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 ASTM A 653, Grade 40 or Steel Sheet, Carbon, Hot-Rolled, ASTM A 1011, Grade 40. Anchors manufactured from 14 gauge material shall conform to the Standard Specification for Steel Sheet, Zinc-Coated (Galvanized) by Hot-Dip Process ASTM A 653, Grade 50, or Steel Sheet, Carbon, Hot-Rolled ASTM A 1011, Grade 50.
SHAPE:
The cross section of post, anchors, and omni directional anchors/sleeves shall be formed square tubing sized to permit telescoping internally or externally. Section properties shall meet the following:
Posts
| Size |
| U.S.S. Gauge |
| Minimum Yield Strength |
| Weight per Foot, Pounds |
| 1 ½ x 1 ½ in |
| 12 |
| 40,000 psi |
| 1.70 |
| 1 ¾ x 1 ¾ in |
| 12 |
| 40,000 psi |
| 2.06 |
| 2 x 2 in |
| 12 |
| 40,000 psi |
| 2.42 |
| 2 ¼ x 2 ¼ in |
| 12 |
| 40,000 psi |
| 2.77 |
| 2 ½ x 2 ½ in |
| 12 |
| 40,000 psi |
| 3.14 |
Anchors and Omni Directional Anchors / Anchor Sleeves (post component)
| Size |
| U.S.S. Gauge |
| Minimum Yield Strength |
| Weight per Foot, Pounds |
| 2 x 2 in |
| 12 |
| 40,000 psi |
| 2.42 |
| 2 ¼ x 2 ¼ in |
| 12 |
| 40,000 psi |
| 2.77 |
| 2 ½ x 2 ½ in |
| 12 |
| 40,000 psi |
| 3.14 |
LENGTH:
The length of each post or anchor/sleeve shall be as specified with a permissible tolerance of ±¼ in. overall.
FINISH:
The posts shall be straight and have a smooth uniform finish. It shall be possible to telescope all consecutive sizes of posts freely and for at least 10 ft (3.0 m) of their length without the necessity of matching any particular face to any other face. All holes and ends shall be free from burrs and ends shall be cut square.
The posts shall be hot-dip galvanized 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 a weld process is performed after galvanizing, the weld shall be zinc-coated after the scarfing operation.
PACKAGING:
Posts shall be securely bundled with 4 or more steel straps and shall weigh approximately 2000 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-20-21 Effective November 2021
File details come from the government source that posted it. Updated .