TCS_8.pdf
PDF 3 MB Posted
- Attached to
- DOTD MAST ARM POLES
- Solicitation number
- 3000026540
- Issued by
- East Baton Rouge Parish, Louisiana
About this file
This is a Traffic Control Standard specification document issued by the Louisiana Department of Transportation and Development (DOTD) for mast arm and twin mast arm steel poles. The specification establishes technical requirements for single and dual mast arm poles ranging from 16 to 17 feet in height, with arm tips positioned at a minimum of 20 feet and maximum of 21 feet above ground after deflection loading. The poles are designed to accommodate signal heads at multiple locations along the arm, with boss spacing requirements varying based on arm length: 10- to 20-foot arms require 2 bosses, 25- to 30-foot arms require 3 bosses, and 35- to 50-foot arms require 4 bosses. Each boss accommodates 1-inch rigid conduit thread connections positioned 10 feet apart horizontally, with the first boss located 16 inches from the arm tip. The specification references multiple SAP material numbers and stock numbers for both single mast arms (11066-11072) and dual mast arms (11073-11084), with associated figures and detailed dimensional requirements for shaft diameters, base plate bolt circles, and transformer base configurations.
The poles must be designed to simultaneously support signal heads weighing 100 pounds each with a projected area of 11 square feet, capable of withstanding sustained wind velocities of 100 miles per hour in accordance with the latest AASHTO Standard Specification for Structural Supports for Highway Signs, Luminaries, and Traffic Signals. The transformer base is approximately 20 inches high with 360-degree rotation capability and includes a removable access panel and grounding provisions. All material shall conform to the Louisiana Standard Specifications for Roads and Bridges, 2016 Edition, Section 1013. Hardware components, including four 1-inch threaded bolts and grounding lugs (Fargo GC202 or approved equal), must be packaged together on a per-pole basis, with the manufacturer's name and specifications marked on the pole shaft, mast arm, and transformer base.
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Other files
| File | Type | Posted |
|---|---|---|
| U S Preference.pdf | ||
| Louisiana Preference.pdf | ||
| Bid Submission Instructions.pdf | ||
| 3000026540.pdf |
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Text version
TCS#8 Page 2 of 7 MAST ARM AND TWIN MAST ARM STEEL POLES Revised 02/20/2024
Traffic Control Standard #8
Mast Arm and Twin Mast Arm Steel Poles
The poles, including transformer base, shall be approximately 16’ to 17’ high. The height of the arm(s) at the tip shall be a minimum 20’/ maximum 21’ to the bottom of the transformer base after the deflection from the loaded weight of the arm. The length of the arm(s) will be specified on order. Mast arm shall slip fit to shaft.
For more mast arm specifications, see Figure 1 for single mast arms
(SAP Material Number 11066 (Stock# 14-12-1625), 11067 (14-12-1661) 11068 (14-12-1707) 11069 (14-12-1712) 11070 (14-12-1715) 11071 (14-12-1718) 11072 (14-12-1720) and
And Figure 1a for dual mast arms (SAP Material Number 11073 (Stock# 14-12-1722), 11074 (14-12-1725) 11075 (14-12-1730) 11076 (14-12-1732) 11077 (14-12-1735) 11078 (14-12-1747) 11079 (14-12-1750) 11080 (14-12-1753) 11081 (14-12-1760) 11082 (14-12-1763) 11083 (14-12-1767) 11084 (14-12-1769)
A hand hole shall be provided at the union of the arm and pole shaft to provide access into wire way. Bosses in the mast arm shall be 1-½” rigid conduit thread and set at 45 from the horizontal (downward rotation at center of boss, 0 toward arm tip). Bosses shall be located at a horizontal distance of 10' apart, with the first located 16" from the tip of arm. The number of bosses required is listed in the following table:
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ARM LENGTH NO. BOSSES SHAFT DIAMETER
(MAX)
SHAFT BASE PLATE
BOLT CIRCLE (MAX)
10' - 20' 2 10" 14-1/2" 25' - 30' 3 12" 15" 35' - 50' 4 13" 16"
Bosses shall have galvanized plugs installed to full-thread depth prior to shipment from the manufacturer. These plugs shall be 1-½” rigid conduit thread.
A hanger plate and horizontal boss shall be at the tip of the arm. The arm shall have an upsweep design. The traffic support pole shall be designed to be simultaneously loaded, at each boss, with a signal head. Each signal head shall have a designed weight of 100 pounds, have a projected area of 11 square feet, and be subject to a sustained wind velocity of V = 100 MPH. The design shall meet the requirements of the latest edition of AASHTO Standard Specification for Structural Supports for Highway Signs, Luminaries, and Traffic Signals.
The pole shaft base is to have an approximate diameter as listed above and shall be bolt coupled to the transformer base utilizing four (4) 1-½” threaded bolts conforming to the specifications as shown in Figure 2. Pole shaft shall have a 1” and a 3” boss centered on a horizontal line 6” from the base. When facing the bosses, the 1” boss shall be a maximum of 35˚ to the right of the 3” boss.
The transformer base is to be approximately 20" high and rotate 360˚. The top of the transformer base is to have four (4) slots approximately 1-½” X 2-½” in size for bolting the pole to transformer base.
A removable panel shall be provided on the side of the transformer base for access into the base.
A ½” 13NC threaded grounding nut shall be provided on the sidewall to the left of the panel. A grounding lug shall also be provided with each pole (Fargo GC202 or approved equal). The bottom of the transformer base shall be designed to fit a 16" diameter bolt pattern utilizing four (4) 1-¾” threaded bolts supplied with each pole. These bolts shall conform to the specifications as shown in Figure 3.
The pole shaft and mast arm(s) shall have a suitable wire way throughout their length.
The pole shaft, mast arm(s), and transformer base shall have the manufacturer’s name, the primary mast arm length and clamp-on mast arm length respectively. (Example LADOTD 30/20).
All pole hardware shall be packaged together on a per pole basis.
All material shall conform to the Louisiana Standard Specifications for Roads and Bridges, 2016 Edition, Section 1013.
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