Arlington County Traffic Signal Specifications - 2019.pdf

2019 Traffic Signal Specifications

This document contains the specifications for construction and maintenance of traffic signals within Arlington County. These specifications supplement related VDOT Road and Bridge

Specifications.

Version 3: 01/31/2019

Arlington County

List of Document Revisions

Version Date Description Section(s)

Impacted

1 04/12/2017 Added references to new standard mast arm pole foundation designs.

13166

2 09/30/2017 Amended several execution and pay items throughout existing sections. Minor modifications made to cabinet specification. Added new specifications for Electric Signal

Service, Aerial Work, Vehicle Signals.

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13161

13164

13165

13166

13167

13169

13170

13172

13176

13177

13178

13179

13180

13181

13182

3 1/31/2019 Amended several execution and pay items throughout existing sections, adding specifications for field acceptance testing and preventive maintenance for ITS assets.

Modifications made to Closed Circuit Television Cameras specifications.

Added reference to standards for School Beacon

Assemblies.

Added new specifications for Rectangular Rapid Flash

Beacon Assemblies, Variable Message Signs, LED Blank Out

Signs, Radar Speed Indicator Sign Assemblies, Permanent

Count Stations, and Bluetooth Detectors.

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13169

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13173

13174

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13183

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13185

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Content will appear highlighted in grey to mark changes that occur in the latest revision. Revisions from past updates will not appear shaded.

Arlington County Department of Environmental Services i

Table of Contents

Acronyms and Abbreviations for Traffic Signal Specifications ........................................................... vii

Section 13160: Traffic Signal Installation

1 Description

2 Reference Documents

3 Installer Certification

4 Lead Worker / Supervisor

5 Roadway Work and Permit

6 Equipment Salvage

7 Existing Traffic Signals

8 Intersection Power

9 Utilities

10 Job Site Conditions

11 Maintenance of Traffic

12 Required Submittals for Construction

Section 13161: Junction Boxes

1 County Standards

2 Materials

3 Execution

4 Measurement and Payment

Section 13162: Non-Ornamental Signal Mast Arm Poles

1 County Standards

2 General

3 Design

4 Design Loading Requirements

5 Materials

6 Pole Shafts

7 Mast Arms

8 Anchor Bolts

9 High-Strength Bolts

10 Execution

11 Measurement and Payment

Arlington County Department of Environmental Services ii

Section 13163: Round Fluted Ornamental Mast Arm Poles

1 County Standards

2 General

3 Design

4 Design Loading Requirements

5 Materials

6 Pole Shafts

7 Mast Arms

8 Anchor Bolts

9 High-Strength Bolts

10 Execution

11 Measurement and Payment

Section 13164: Traffic Signal Conduit

1 Materials

2 Execution

3 Measurement and Payment

Section 13165: Traffic Cables

1 Materials

2 Execution

3 Measurement and Payment

Section 13166: Foundations

1 County Standards

2 General

3 Materials

4 Execution

5 Measurement and Payment

Section 13167: Pedestrian Signal Poles and Equipment

1 County Standards

2 Materials

3 Execution

4 Measurement and Payment

Section 13168: Accessible Pushbutton System

1 County Standards

Arlington County Department of Environmental Services iii

2 Materials

3 Execution

4 Measurement and Payment

Section 13169: Emergency Vehicle Preemption Systems

1 Materials

2 Execution

3 Measurement and Payment

Section 13170: Traffic Signal Control Cabinet

1 County Standards

2 General

3 Cabinet Components and Layout

4 Warranty

5 Execution

6 Measurement and Payment

Section 13171: Traffic Signal Controllers

1 Materials

2 Execution

3 Measurement and Payment

Section 13172: Closed-Circuit Television Cameras

1 Materials

2 Execution

3 Measurement and Payment

Section 13173: School Beacon Assemblies

1 County Standards

2 Materials

3 Execution

4 Measurement and Payment

Section 13174: Uninterruptible Power Supply

1 Materials

2 UPS Operation

3 Maintenance, Displays, Controls, and Diagnostics

4 Execution

5 Warranty

Arlington County Department of Environmental Services iv

6 Measurement and Payment

Section 13175: Traffic Signal Turn-On, Pickup, Removal, and Maintenance

1 General Description

2 Execution

3 Measurement and Payment

Section 13176: Signal Design

1 Design Elements

2 Plan Development

Section 13177: Cabinet/Overhead Preventive Maintenance

1 Materials

2 Execution

3 Measurement and Payment

Section 13178: Loop Detectors

1. Materials

2. Execution

3 Measurement and Payment

Section 13179: Thermal Video Detection Cameras

1 Materials

2 Warranty

3 Execution

4 Measurement and Payment

Section 13180: Electric Signal Service

1 County Standards

2 Materials

3 Execution

4 Measurement and Payment

Section 13181: Aerial Work

1 Materials

2 Execution

3 Measurement and Payment

Section 13182: Vehicle Signals

1 Materials

2 Execution

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3 Measurement and Payment

Section 13183: Rectangular Rapid Flash Beacon Assemblies (RRFB)

1 County Standards

2 Materials

3 Execution

4 Measurement and Payment

Section 13184: Variable Message Signs

1 Materials

2 Execution

3 Measurement and Payment

Section 13185: LED Blank Out Signs

1 Materials

2 Execution

3 Measurement and Payment

Section 13186: Radar Speed Indicator Sign Assemblies

1 County Standards

2 Materials

3 Execution

4 Measurement and Payment

Section 13187: Permanent Count Stations

5 Materials

6 Execution

7 Measurement and Payment

Section 13188: Bluetooth Detectors

1 Materials

2 Execution

3 Measurement and Payment

Arlington County Department of Environmental Services vi

Tables

Table 62-1: Design Attachment Loading (Dead Loads)

Table 62-2: Material Yields for Construction Components

Table 62-3: Pole Design Shaft Diameter

Table 63-1: Attachment Design Loading (Dead Load)

Table 63-2: Material Yields for Construction Components

Table 63-3: Pole Design Shaft Diameter

Table 76-1: Minimum Requirements for Signal Design Plan Sheets

Arlington County Department of Environmental Services vii

Acronyms and Abbreviations for Traffic Signal Specifications

°C degrees Celsius cm centimeter dB decibel

Dia. diameter

Hz hertz ksi kilopounds per square inch lbs pounds mV millivolt psi pounds per square inch

SF square feet

V volt

VAC volts alternating current

VDC volts direct current

W watt

AASHTO American Association of State Highway and Transportation Officials

AC alternating current

ADA Americans with Disabilities Act

ANSI American National Standards Institute

APS accessible pushbutton system

ASTM ASTM International

AWG American Wire Gauge

AWS American Welding Society

BBS battery backup system

BIU Bus Interface Unit

CADD computer-aided design and drafting

CCTV closed-circuit television

CCU Central Control Unit

CCU2EN Central Control Unit with Ethernet

County Arlington County, VA

CSA Canadian Standards Association

DC direct current

DTI direct tension indicating

EIA Electronic Industries Alliance

EN2 Ethernet Adaptor

EVP Emergency Vehicle Preemption

FLIR forward-looking infrared

FOV field of view

FS-ATS Fail Safe Automatic Transfer Switch

HDPE high-density polyethylene

ID identification

IEEE Institute of Electrical and Electronics Engineers

IIM Instructional and Informational Memorandum

IMSA International Municipal Signal Association

IP Internet protocol

LCD liquid crystal display

LED light-emitting diode

MUTCD Manual on Uniform Traffic Control Devices for Streets and Highways

NC normally closed

NEC National Electrical Code

NEMA National Electrical Manufacturers Association

NESC National Electrical Safety Code

NFPA National Fire Protection Association

NO normally open

NTSC National Television System Committee

PBS Pushbutton Station

PVC polyvinyl chloride

ROW right-of-way

RS Recommended Standard

Rules Rules for Overhead Electrical Line Construction of the Virginia Public Utilities Commission

S&B Structures and Bridges

TGIC triglycidyl isocyanurate

THD total harmonic distortion

THHN thermoplastic high-heat-resistant nylon-coated

Arlington County Department of Environmental Services viii

TPS Trades Program Supervisor

UL Underwriters Laboratories

UPS uninterruptible power supply

USB universal serial bus

VDOT Virginia Department of Transportation

Arlington County Department of Environmental Services 1

Section 13160: Traffic Signal Installation

1 Description

This document contains the specifications for traffic signals and related electrical systems for projects in Arlington County, VA (County). These specifications include the installation of material, equipment, and work procedures that are described in the Arlington County

Traffic Signal and Streetlight Standards. The specifications meet the minimum functional requirements that must be satisfied.

2 Reference Documents

(a) All equipment and material shall conform to the standards of the following:

(1) Institute of Transportation Engineers

(2) International Municipal Signal Association (IMSA)

(3) 2016 Road and Bridge Specifications, Virginia Department of Transportation

(VDOT)

(4) Virginia Professional Excavator’s Manual, April 2014

(5) American Association of State Highway and Transportation Officials (AASHTO)

Standard Specifications for Structural Supports for Highway Signs, Luminaires, and Traffic Signals, latest edition

(6) VDOT Instructional and Informational Memorandum, Structure and Bridge

Division (IIM-S&B)-90.2, VDOT Guidelines to AASHTO Standard Specifications for Structural Supports for Highway Signs, Luminaires, and Traffic Signals, 6th

Edition, 2013 with 2015 interims

(7) 2009 Manual on Uniform Traffic Control Devices (MUTCD), Federal Highway

Administration

(8) American Welding Society (AWS) D1.1, Structural Welding Code

(b) In addition to the requirements of the above specifications, the plans, standard details, special contract provisions, and all material and work shall conform to the requirements in the following:

(1) Virginia Supplement to the 2009 Manual on Uniform Traffic Control Devices for

Streets and Highways (MUTCD), Revision 1

(2) National Fire Protection Association (NFPA) 70, National Electrical Code (NEC)

(3) Institute of Electrical and Electronics Engineers (IEEE) C2-2017, National

Electrical Safety Code (NESC)

(4) Rules for Overhead Electrical Line Construction of the Virginia Public Utilities

Commission (Rules)

Arlington County Department of Environmental Services 2

(5) Standards of the American Society for Testing and Materials (ASTM)

International (ASTM)

(6) Standards of the American National Standards Institute (ANSI)

(7) Arlington County Department of Environmental Services Construction

Standards and Specifications

(8) Arlington County Traffic Signal and Streetlight Standards and Specifications

(9) National Electrical Manufacturers Association (NEMA), Standards Publication

No. TS2-2003

(10) ANSI/IEEE C.62.41, IEEE Recommended Practice on Characterization of

Surges in Low-Voltage (1000V and Less) AC Power Circuits

(11) Applicable local ordinances

(12) Underwriters Laboratories (UL) Standards

Wherever reference is made in this document or in the special contract provisions to any of the rules and standards listed above, the reference shall be construed to be to the document that is in effect at the date of bidding.

3 Installer Certification

The Contractor(s) awarded under this contract shall have traffic signal technicians who have obtained an International IMSA Level II Traffic Signal Certification if they work on the project site and are in charge of any of the following:

(a) All traffic signal-related electrical wiring terminations and splices, including but not limited to grounding, service entrances, and loops

(b) Controller unit and cabinet assembly set-ups

(c) Testing and review of all operational electrical equipment

(d) Traffic signal assembly

(e) Troubleshooting signals on flash or while working on controller cabinets

(f) Cabinet preventive maintenance

(g) Conduit installation (boring or trenching)

(h) Pole foundation installation and pole setting

(i) Junction box installation

(j) Cable pulling and installation

4 Lead Worker / Supervisor

A Lead Worker / Foreman shall be assigned to each project. This individual is required to have at least 5 years of experience in traffic signal construction and installation and must

Arlington County Department of Environmental Services 3 have an IMSA Level II Traffic Signal Technician Certification. The County must approve the Lead Worker / Foreman and his or her replacement(s) before work on the project begins.

5 Roadway Work and Permit

Unless stated otherwise, all roadway and sidewalk work shall be in accordance with the latest version of the Virginia Road and Bridge Standards and Specifications. If the VDOT and County specifications conflict, the Contractor shall notify the County Engineer.

Generally, County specifications shall supersede VDOT specifications for County-maintained traffic signals and roadway work within the County right-of-way (ROW).

6 Equipment Salvage

(a) All traffic signal equipment that is removed shall remain the property of the County.

Such property is to be removed from the work site, tagged with date removed and location, and returned by the Contractor to the Arlington County Department of

Environmental Services, 4300 29th Street S., Arlington, VA 22206. At the County

Project Manager’s discretion, the Contractor may be directed to dispose of the materials in lieu of salvage.

(b) When signal pole and mast arm assemblies are removed, all components shall be marked as a set with permanent markings. The equipment shall be returned in the same condition as removed. Contact the Traffic Signal Supervisor to coordinate delivery. At the County Project Manager’s discretion, the Contractor may be directed to dispose of the materials rather than deliver them to the County.

7 Existing Traffic Signals

(a) When existing traffic signal installations are modified or completely rebuilt, the

Contractor shall work around existing traffic signal equipment until the new or modified traffic signal system has been installed and put into operation.

(b) Signal heads that are installed on span wire or poles for new installation and are not ready for actual electrical operation shall be bagged with black plastic or a suitable non-transparent material.

(c) The Contractor shall maintain continuous operation of a minimum of two three-section (red, yellow, and green) traffic signal heads and pedestrian heads (if required) for each roadway approach. Special consideration shall be made to avoid the left-turn trap situation.

8 Intersection Power

The Contractor is responsible for coordinating power sources with Virginia Dominion

Power to obtain power hook-up to the intersection and luminaires. The Contractor shall

Arlington County Department of Environmental Services 4 ensure coordination with Virginia Dominion Power from the early stages of construction to deliver the project on time.

9 Utilities

(a) The utilities shown on the plans are based on records and surface field indications.

All utility locations require field verification in cooperation with the affected utility companies and public agencies.

(b) The Contractor shall follow the guidelines and procedures set forth in the Virginia

Professional Excavator’s Manual and is responsible for locating utility-related equipment such as gas and electric, and sewer laterals, valve boxes, and manholes and for ensuring that the equipment is properly protected and that signal equipment locations are adjusted accordingly with approval from the County Engineer.

(c) Miss Utility does not locate private utility laterals. The Contractor is responsible for locating and marking private utilities in the work area or right-of-way prior to excavation. The Contractor is responsible for repairing any damage to private utilities that occurs as a result of construction at no additional cost to the owner.

10 Job Site Conditions

The Contractor shall maintain a safe and clean job site throughout construction. Upon project completion, the job site shall be neat and clean with all trash and dirt picked up and barricades removed. Landscaping shall be restored and sidewalks swept as needed.

The job site shall be left in as good or better condition than it was before construction.

11 Maintenance of Traffic

All specifications assume that Maintenance of Traffic is incidental to the item descriptions provided unless a specific MOT plan is prepared for the signal work.

12 Required Submittals for Construction

Prior to beginning construction related activities, the Contractor shall provide submittals for all traffic signal and ITS equipment and poles. Use of a VDOT pre-approved material does not preclude the County’s submittal requirement. However, if a product is on the

VDOT approved materials list, this should be noted on the submittal to expedite review.

The submittals shall detail the products intended for installation and their conformance with VDOT and County specifications. Product compliance with required ASTM, ANSI, NEC, IMSA and other technical specifications shall be outlined on the submittals.

At a minimum, the Contractor is required to provide shop drawings and/or product submittals for:

(a) Poles (including caps and bases)

(1) Mast Arms and Signal Poles (PE sealed drawings)

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(2) Pedestal Poles

(3) Bollard Poles

(4) Streetlight Poles

(b) Equipment

(1) Controller

(2) Cabinet

(3) Push buttons and CCU

(4) Pre-emption Systems

(5) Video Detection Systems

(6) Vehicular and Pedestrian Signals and backplates

(7) Mounting Equipment

(8) Signs (regulatory, street name, guide signs, etc.)

(9) LED blank outs

(10) CCTV Camera System

(11) Streetlight fixture

(12) Battery Backup System (including auxiliary cabinet)

(13) Meter Pedestal

(c) Cables

Arlington County Department of Environmental Services 6

Section 13161: Junction Boxes

1 County Standards

The detail drawings in the Arlington County Traffic Signal Standards that are applicable to junction boxes are as follows:

(a) 61-01 Small Junction Box (Non-Traffic Use)

(b) 61-02 Traffic Rated Circular Junction Box

(c) 61-03 Traffic Rated Circular Junction Box Frame and Cover

(d) 61-04 Large Size Junction Box (Non-Traffic Use)

2 Materials

Composite junction boxes shall be Quazite Composite model number PC1212BA12 or equivalent with Cover PC1212CA00 or equivalent per County Standards. The cover shall be marked “Arlington County Transportation.”

Traffic-rated junction boxes shall consist of a 24-inch steel frame and cover set on top of a 24-inch-diameter pre-cast structure per standards.

3 Execution

Execution shall consist of providing the specified box, any required excavation to install the box, installing required conduits into the box, and patching conduit entrance holes per

County Standards.

(a) All conduits entering a junction box shall enter the box tangent to the box wall at the entry point.

(b) Conduit entry holes shall be patched such that debris and water cannot enter the structure.

(c) Conduits shall have bell ends installed in junction boxes.

(d) Conduits shall enter the sides of the structure at the depth of the conduit run and extend a minimum of 2 inches and a maximum of 3 inches into the structure.

(e) All junction boxes shall be set on washed gravel with a minimum of depth of

12 inches.

(f) The top of the junction box shall be installed flush with the grade unless otherwise specified.

(g) All metal junction box lids shall be painted black after final installation.

(h) All connections to grounding rods shall be accomplished by mechanical splice using grounding acorn clamps.

Arlington County Department of Environmental Services 7

(i) A 5/8-inch by 8-foot copper-clad grounding rod shall be installed in each junction box.

(j) Small junction boxes shall consist of a 12-inch by 12-inch (internal diameter) Quazite box with Quazite Composite PG Series 12-7/8-inch by 12-7/8-inch box with cover per

County Standards.

(k) Traffic-rated junction boxes shall consist of 24-inch-diameter frames and covers set on top of 24-inch-diameter pre-cast structures per County standards.

(l) Conductor cables shall be installed with their slack length coiled in junction boxes.

The coiled length shall be sufficient to allow cables to extend at least 4 feet above the junction box.

(m) The Contractor shall drill out an area to insert conduits to enter existing junction boxes as directed by the Engineer or authorized representative. The entry point for the conduits shall be 18 to 24 inches below finished grade.

(n) Remove Junction Box shall include removing the junction box, capping or removing conduits, backfill and compaction, and final restoration.

(o) Adjusting Junction Box to grade shall include excavating around the existing box, installing any needed riser sections, re-setting the existing box, re-working conduits, and compacting around the box as needed.

4 Measurement and Payment

(a) Furnish Junction Box shall be measured and paid for per each. The price for a junction box shall include the box, the frame and cover, and any hardware required for installation.

(b) Furnish Junction Box Lid shall be measured and paid for on a per-unit basis and shall include all bolts and necessary hardware required for installation. For circular junction boxes, cost of the lid shall include both frame and cover. For larger, double-door junction boxes, the cost of the lid shall include both halves.

(c) Install Junction Box shall be measured and paid for per each. All materials associated with junction box installation, including frame and cover, grounding rod, parging, gravel base, and ground wire, shall be incidental. Restoration of damaged grass, pavers, concrete, asphalt, or other areas shall be incidental.

(d) Enter Existing Junction Box shall be measured and paid for per each. Payment for entry of junction boxes shall be the same regardless of the type of junction box entered or the number of conduits connected. Restoration of damaged grass, pavers, concrete, asphalt, or other areas shall be incidental.

(e) Remove Junction Box shall be measured and paid for per each. The disposal of the box shall be incidental to the item. Restoration of damaged grass, pavers, concrete, asphalt, or other areas shall be incidental.

Arlington County Department of Environmental Services 8

(f) Adjust Existing Junction Box to Grade shall be measured and paid for per each.

Payment for adjustment of junction boxes shall be the same regardless of the type of junction box adjusted or the number of connected. Restoration of damaged grass, pavers, concrete, asphalt, or other areas shall be incidental.

Arlington County Department of Environmental Services 9

Section 13162: Non-Ornamental Signal Mast Arm Poles

1 County Standards

The detail drawings in the Arlington County Traffic Signal Standards that are applicable to non-ornamental mast arm poles are as follows:

(a) 62-01 Non-Ornamental Pole Design Criteria

(b) 62-02 Non-Ornamental Pole Data (1 of 3)

(c) 62-03 Non-Ornamental Pole Data (2 of 3)

(d) 62-04 Non-Ornamental Pole Data (3 of 3)

(e) 62-05 Non-Ornamental Pole

(f) 62-06 Non-Ornamental Pole Details

(g) 62-07 Non-Ornamental Mast Arm Connections (1 of 2)

(h) 62-08 Non-Ornamental Mast Arm Connections (1 of 2)

(i) 62-09 Non-Ornamental Pole Details

(j) 62-10 Non-Ornamental Pole Anchor Bolts

2 General

This section describes minimum acceptable design and installation standards for poles and arms for traffic signals.

The Contractor shall provide Arlington County a written warranty against any defects in materials and workmanship for 1 year from the date of delivery to Arlington County.

For warranty repairs, all costs of labor, parts, and transportation to and from the site shall be borne by the Contractor.

3 Design

The design shall be in accordance with AASHTO Standard Specifications for Structural

Supports for Highway Signs, Luminaires and Traffic Signals, 6th Edition 2013 with 2015

Interims and VDOT IIM-S&B-90.2.

All welding shall be in accordance with Sections 1 through 8 of AWS D1.1, Structural

Welding Code. Tackers and welders shall be qualified in accordance with AWS D1.1.

4 Design Loading Requirements

(a) Structure components and their connections shall be designed to resist the worst-case loading, upon evaluation of all applicable cases acting separately.

(b) Design attachment loading

Arlington County Department of Environmental Services 10

(1) Attachment loading data are shown in Table 3-1.

Table 62-1: Design Attachment Loading (Dead Loads)

Attachment

Surface

Area (SF)

Dead

Load (lbs)

Aluminum three-section head 6 63

Aluminum four-section head 8 84

8-foot x 2-foot street name sign 16 48

10-foot x 2-foot street name sign 20 60

30-inch x 36-inch regulatory sign 7.5 22.5

CCTV camera 1 22

Video detection camera 1 22

Opticom device 1 22

Luminaire 2 40

SF = square feet; lbs = pounds; CCTV = closed-circuit television

(2) 0- to 40-foot mast arm lengths

(i) Three aluminum three-section heads spaced every 10 feet

(ii) One aluminum four-section head at the end of the arm (1 foot in from the end)

(iii) One 8-foot by 2-foot street name sign mounted between the inside two signals

(iv) Two 30-inch by 36-inch regulatory signs (next to the last two signal heads)

(v) One closed-circuit television (CCTV) camera halfway on the arm

(vi) One video detection camera over the outside lane

(vii) One Opticom device located 2 feet in from the end of the arm

(3) 42- to 50-foot mast arm lengths

(i) Four aluminum three-section heads spaced every 10 feet

(ii) One aluminum four-section head at the end of the arm (1 foot in from the end)

(iii) One 8-foot by 2-foot street name sign mounted between the inside two signals

(iv) Three 30-inch by 36-inch regulatory signs (next to the last two signal heads)

Arlington County Department of Environmental Services 11

(v) One CCTV camera halfway on the arm

(vi) One video detection camera over the outside lane

(vii) One Opticom device located 2 feet in from the end of the arm

(4) 52- to 60-foot mast arm lengths:

(i) Four aluminum three-section heads spaced every 10 feet

(ii) Two aluminum four-section head at the end of the arm (1 foot in from the end)

(iii) One 8-foot by 2-foot street name sign mounted between the inside two signals

(iv) Four 30-inch by 36-inch regulatory signs (next to the last two signal heads)

(v) One CCTV camera halfway on the arm

(vi) Two video detection cameras (over the outside lane, and over the middle of the remaining length)

(vii) One Opticom device located 2 feet in from the end of the arm

(5) 62- to 66-foot mast arm lengths

(i) Five aluminum three-section heads spaced every 10 feet

(ii) Two aluminum four-section head at the end of the arm (1 foot in from the end)

(iii) One 10-foot by 2-foot street name sign mounted between the inside two signals

(iv) Five 30-inch by 36-inch regulatory signs (next to the last two signal heads)

(v) One CCTV camera halfway on the arm

(vi) Two video detection cameras (over the outside lane and over the middle of the remaining length)

(vii) One Opticom device located 2 feet in from the end of the arm

(6) All poles shall also be designed for one 12-foot luminaire arm and one luminaire at the end of the luminaire arm. This allows longer luminaire arms to be installed in the future.

(c) Wind loading

The entire assembly shall be designed to meet the wind loading requirements of

VDOT IIM-S&B-90.2.

(d) Fatigue loading

Arlington County Department of Environmental Services 12

The entire assembly shall be designed to meet the fatigue loading requirements of

VDOT IIM-S&B-90.2.

(e) Special designs

Mast arm signal pole systems with a larger loading than specified above require a special design. Special designs shall be submitted to the County with sealed shop drawings and a letter from a Professional Engineer in the Commonwealth of Virginia certifying that the design meets the requirements of this specification.

Design shall include mast arm(s), luminaire arm, pole, baseplate, and anchor bolt analysis. Maximum arm and pole loads, stresses, and combined stress ratios shall be provided for each group load, as well as maximum pole dead load rotation.

For anchor bolt forces, pole forces shall be positioned in such a manner to maximize the force on any individual bolt regardless of the actual bolt orientation with the pole.

The design of anchor bolts shall result in a ductile steel failure prior to any sudden brittle failure of the concrete.

Provide to the County, shop drawings detailing the poles as designed. Shop drawings shall contain all component drawings necessary to fabricate the structure.

Drawings shall at a minimum specify the pole height, arm length(s), pole and arm diameters at the base and tip, splice locations, bolt circle diameter, bolt diameters, and detailed drawings showing the handhole cover assemblies. The drawings shall also show the width, depth, length, and thickness of all material and list pertinent

ASTM specification designations together with the tensile strength of metallic members.

5 Materials

(a) The materials used for construction shall meet the requirements listed in Table 3-2.

Table 62-2: Material Yields for Construction Components

Component ASTM Designation Minimum Yield (ksi)

Pole shaft A595 or A572 55

Pole base A36 36

Galvanizing structure A123 —

Galvanizing hardware A153 —

Arm shaft A595 or A572 55

Arm connection A36 36

Arm connection bolts F3125 GALVD. To A153 —

DTI washers ASTM F959 —

Luminaire arm shaft Per manufacturer 35

Luminaire arm casting A27GR.65-35 35

Arlington County Department of Environmental Services 13

Component ASTM Designation Minimum Yield (ksi)

Luminaire arm connection bolts SAE GR.5 or ASTM F3125 —

Plate and channel A36 36

Anchor bolts F1554 55 ksi = kilopounds per square inch; DTI = direct tension indicating

(b) The manufacturer shall provide mill certifications for steel materials.

(c) All poles, arms, transformer bases, and hardware shall be galvanized with powder coating or painted as specified on the plans or by the Engineer prior to installation.

(d) Non-ornamental poles shall have a rust-resistant coating applied to the inside of the pole. The color of the outside of the pole will be specified at time of order. All poles, arms, ornamental bases, and hardware shall use one of the following coating systems:

(1) Option 1

(i) Primer = DuPont 25P Primer

(ii) Top Coat = DuPont 333 Imron

(2) Option 2

(i) Triglycidyl isocyanurate (TGIC) polyester powder at a minimum thickness of 2.0 mils

6 Pole Shafts

(a) There are four size categories of single-arm mast arm poles:

(1) 20 to 40 feet

(2) 42 to 48 feet

(3) 50 to 60 feet

(4) 62 to 66 feet

To achieve interchangeability between poles and foundations, all of the poles in a size category shall have the same base plate size and bolt pattern.

(b) There are four size categories of dual-arm mast arm poles:

(1) 20 to 40 feet

(2) 42 to 48 feet

(3) 50 to 60 feet

(4) 62 to 66 feet

Arlington County Department of Environmental Services 14

The lengths listed are the longest arm. To achieve interchangeability between poles and foundations, all of the poles in a size category shall have the same base plate size and bolt pattern.

(c) Mast arm poles shall be 30 feet tall. The mast arm connection shall be located

20 feet above the base of the pole. The luminaire arm connection shall be located 29 feet and 6 inches above the base of the pole.

Truncated pole shafts (poles without extra height for luminaires) shall be 2 feet taller than the top of the connection plate. The design of the pole should assume conditions for a pole with luminaire arm.

(d) Mast arm poles shall be round. Multi-sided pole shafts are unacceptable. The shaft shall be one piece and contain no circumferential weld butt splices. The shaft shall have a constant linear taper of 0.14 inch per foot. The minimum thickness of steel shall be 7 gauge.

(e) Pole diameters at the connection to the base plate shall not exceed the diameters listed in Table 3-3.

Table 62-3: Pole Design Shaft Diameter

Single-Mast Arm Poles Dual-Mast Arm Poles

Arm Length (ft) Max Dia. (in.) Arm Length (largest) (ft) Max Dia. (in.)

<40 18 <50 20

40-48 20 50+ 24

50+ 24 — — ft = feet; in. = inches; dia. = diameter

(f) Identification tag

Provide an identification tag affixed to the pole with the following information:

(1) Arlington County, VA

(2) Manufacturer

(3) Date of manufacture (MM/YY)

(4) Pole height and gage

(5) Arm length and gage

(6) Anchor bolt diameter and length

(7) Bolt circle diameter (on center of bolts)

(8) Serial number

The tag shall be attached between 4 feet and 5 feet above the base of the pole.

Arlington County Department of Environmental Services 15

(g) Handholes

(1) An access hole and J-hook shall be provided on the opposite side of the pole shaft from the mast arm at the same elevation as the center of the mast arm.

The access hole at the mast arm height shall have an outside dimension of 4 inches by 6 inches exclusive of reinforcement. The handhole cover shall be attached to the inside of the pole with a chain to prevent dropping the handhole cover.

(2) A second access hole shall be provided 2 feet above the pole base to the bottom of the access hole. The lower access hole shall be provided on the opposite side from the attachment of the longest mast arm. The lower access hole shall have an outside dimension of 6 inches by 8 inches exclusive of reinforcement.

(3) Provide a grounding L-clip welded directly opposite the access hole on the inside wall of the pole.

(4) All handholes shall have a neoprene rubber gasket that is permanently secured to the handhole frame to ensure weather-tight protection. Handholes shall be provided with a bolted-on galvanized steel cover painted to match the pole. The handhole cover shall be removable from the frame.

(h) Connection plate

The mast arm connection plate shall be located 20 feet above the base of the pole.

The connection plate shall have an upward angle 3 degrees from the horizontal plane. See attached drawings.

(i) Pole top

Each pole shall be provided with an end cap secured in place with set screws.

(j) Luminaire arm

(1) Poles shall be supplied with a luminaire arm. The luminaire arm shall be a King

Luminaire model KA120-S or equivalent. See attached drawings.

(2) The luminaire arm connection shall be located 29 feet and 6 inches above the base of the pole. The arm shall extend 6 feet from the pole shaft.

7 Mast Arms

(a) There are four size categories of mast arms:

(1) 20 to 40 feet

(2) 42 to 48 feet

(3) 50 to 60 feet

(4) 62 to 66 feet

Arlington County Department of Environmental Services 16

(b) To achieve interchangeability between arms and poles, all of the arms in a size category shall have the same connection plate size and bolt pattern.

(c) Mast arms shall be round. Multi-sided and fluted mast arms are unacceptable. Mast arms shall have a constant linear taper of 0.14 inch per foot. The minimum thickness of steel shall be 7 gauge.

(d) Mast arms up to 50 feet in length shall be manufactured and shipped in one piece.

Mast arms 50 feet and longer shall be manufactured and shipped in two pieces with no piece having a length greater than 40 feet. Circumferential welded tube butt splices and laminated tubes are not permitted.

(e) Wire entrance holes 1-3/8 inches in diameter shall be drilled into the bottom of the arm every 11 feet starting at a point approximately 9 inches from the free end of the arm. Rubber grommets shall be installed in all wire entrance holes.

8 Anchor Bolts

(a) A minimum of six fully galvanized anchor bolts shall be supplied for all mast arm poles. There shall be two steel templates provided per pole. All templates shall be fully galvanized.

(b) Provide galvanized nuts compatible with the anchor bolts as needed to complete the installation. Nut covers shall be provided for all nuts.

(c) Furnish two flat washers with each bolt/nut/washer assembly. Furnish galvanized direct tension indicating (DTI) washers. Use the size, number, type, and configuration of hardened flat washers the DTI manufacturer recommends for the anchor bolt diameter.

(d) The following notes shall be included on all plans and/or shop drawings in reference to anchor bolts:

(1) Pretensioning of all anchor bolts is required and shall be accomplished with the use of DTI washers. Nuts shall be tightened until proper pretensioning is indicated by the DTI washer.

(2) The maximum clearance between the bottom of the leveling nuts and the top of the concrete is critical and shall not exceed the amount specified on the drawing.

9 High-Strength Bolts

(a) Provide galvanized high-strength bolts for connections. Provide galvanized nuts compatible with the bolts as needed to complete the installation.

(b) Furnish two flat washers with each bolt/nut/washer assembly. Furnish galvanized

DTI washers. Use the size, number, type, and configuration of hardened flat washers the DTI manufacturer recommends for the bolt diameter.

Arlington County Department of Environmental Services 17

10 Execution

(a) Installation of mast arm poles shall include transporting the poles from the Arlington

County Trades Center or other designated location to the job site, placing the poles on the proper foundations, and installing luminaire arms if necessary. Once placed, the Contractor must properly clean all poles and remove all labels prior to acceptance.

(1) Steel poles shall be placed and securely mounted on concrete foundations.

(2) Strain poles and mast arm poles shall have a 3% rake or as specified by the

Engineer or the authorized representative such that the pole is vertical under dead loads.

(3) All pole accessories including scrolls, nuts, nut covers, handhole covers, mast arm end caps, and pole caps shall be in place prior to acceptance.

(4) Installation shall include bolting the mast arm(s) to the pole. Any traffic control required for installation shall be incidental to the installation of the mast arm.

(5) Pretensioning of all connection and anchor bolts is required and shall be accomplished with the use of DTI washers. Nuts shall be tightened until proper pretensioning is indicated by the DTI washer according to the instructions detailed by the DTI washer manufacturer.

(6) Field welding is not permissible without written approval by the Engineer.

(7) The use of grout under base plates is not permitted.

(8) Install traffic signal heads and signs within 5 days after the mast arm is installed.

(b) Removal of strain pole shall include the removal of the pole, overhead span wire, and any equipment on the pole or span. The Contractor shall check with the County representative on whether to salvage and return the pole. The foundation of the pole shall be removed to a minimum of 2 feet below grade or as required for installation of the new pole.

(c) Removal of mast arm pole shall include removal of the pole including the mast arm from the site. The Contractor shall check with the County representative on whether to store it or dispose of it. The foundation of the pole shall be removed as per County specifications.

(d) Removal of wood poles shall include removal of the wood pole from the site and disposal of the pole by the Contractor. The hole remaining shall be backfilled with select material and compacted to a density of 95%. The area disturbed by removal of the pole shall be patched with cold mix asphalt.

Arlington County Department of Environmental Services 18

(e) Removal of down guy shall include the removal and disposal of the guy strand, guy guard, guy anchor rod, and associated hardware from the pole. The Contractor shall dispose of these materials at its own expense.

11 Measurement and Payment

(a) Furnish Traffic Signal Pole shall be measured and paid for at the contract unit price per each for each size. This shall include mast arms, flanges plates, anchor plates, bolts, transformer bases, painting, welding, labor, and all other associated equipment and hardware required for installation.

(b) Furnish Luminaire Arm shall be measured and paid for at the contract unit price per each. This shall include mounting, LED lamp, photocell, and all other associated equipment and hardware required for installation.

(c) Install Signal Pole & Mast Arm shall be measured and paid for on a per-unit basis.

When not included as a separate line item, but where called for on the plans, installation of luminaire arms shall be included in the installation cost of the signal pole.

(d) Remove Signal Pole & Mast Arm shall be measured and paid for on a per-unit basis.

(e) Remove Signal Strain Pole shall be measured and paid for on a per-unit basis.

Arlington County Department of Environmental Services 19

Section 13163: Round Fluted Ornamental Mast Arm Poles

1 County Standards

(a) 63-01 Ornamental Pole Design Criteria

(b) 63-02 Ornamental Pole Data (1 of 3)

(c) 63-03 Ornamental Pole Data (2 of 3)

(d) 63-04 Ornamental Pole Data (3 of 3)

(e) 63-05 Ornamental Pole

(f) 63-06 Ornamental Mast Arm Connections (1 of 2)

(g) 63-07 Ornamental Mast Arm Connections (1 of 2)

(h) 63-08 Ornamental Pole Details

(i) 63-09 Ornamental Pole Anchor Bolts

2 General

(a) This section describes minimum acceptable design and installation standards for poles and arms for traffic signals.

(b) The Contractor shall provide the County with a written warranty against any defects in materials and workmanship for a period of 1 year from the time of delivery to the

County.

(c) For warranty repairs, all costs of labor, parts, and transportation to and from the

Contractor shall be borne by the Contractor.

3 Design

(a) The design shall be in accordance with AASHTO Standard Specifications for

Structural Supports for Highway Signs, Luminaires and Traffic Signals, 6th Edition

2013 with 2015 Interims and VDOT IIM-S&B-90.2.

(b) All welding shall be in accordance with Sections 1 through 8 of AWS D1.1 Structural

Welding Code. Tackers and welders shall be qualified in accordance with AWS D1.1.

4 Design Loading Requirements

(a) Structure components and their connections shall be designed to resist the worst-case loading, upon evaluation of all applicable cases acting separately.

(b) Design attachment loading

(1) Attachment loading requirements are summarized in Table 4-1.

Arlington County Department of Environmental Services 20

Table 63-1: Attachment Design Loading (Dead Load)

Attachment Surface Area

(SF)

Dead Load (lbs)

Aluminum three-section head 6 63

Aluminum four-section head 8 84

8-foot by 2-foot street name sign 16 48

10-foot by 2-foot street name sign 20 60

30-inch by 36-inch regulatory sign 7.5 22.5

CCTV camera 1 22

Video detection camera 1 22

Opticom device 1 22

Luminaire 2 40

SF = square feet; lbs = pounds; CCTV = closed-circuit television

(2) 0-foot to 40-foot mast arm lengths:

(i) Three aluminum three-section heads spaced every 10 feet

(ii) One aluminum four-section head at the end of the arm (1 foot in from the end)

(iii) One 8-foot by 2-foot street name sign mounted between the inside two signals

(iv) Two 30-inch by 36-inch regulatory signs (next to the last two signal heads)

(v) One CCTV camera halfway on the arm

(vi) One video detection camera over the outside lane

(vii) One Opticom device located 2 feet in from the end of the arm

(3) 42-foot to 50-foot mast arm lengths:

(i) Four aluminum three-section heads spaced every 10 feet

(ii) One aluminum four-section head at the end of the arm (1 foot in from the end)

(iii) One 8-foot by 2-foot street name sign mounted between the inside two signals

(iv) Three 30-inch by 36-inch regulatory signs (next to the last two signal heads)

(v) One CCTV camera halfway on the arm

(vi) One video detection camera over the outside lane

(vii) One Opticom device located 2 feet in from the end of the arm

Arlington County Department of Environmental Services 21

(4) 52-foot to 60-foot mast arm lengths:

(i) Four aluminum three-section heads spaced every 10 feet

(ii) Two aluminum four-section heads at the end of the arm (1 foot in from the end)

(iii) One 8-foot by 2-foot street name sign mounted between the inside two signals

(iv) Four 30-inch by 36-inch regulatory signs (next to the last two signal heads)

(v) One CCTV camera halfway on the arm

(vi) Two video detection cameras (over the outside lane, and over the middle of the remaining length)

(vii) One Opticom device located 2 feet in from the end of the arm

(5) 62-foot to 66-foot mast arm lengths:

(i) Five aluminum three-section heads spaced every 10 feet

(ii) Two aluminum four-section heads at the end of the arm (1 foot in from the end)

(iii) One 10-foot by 2-foot street name sign mounted between the inside two signals

(iv) Five 30-inch by 36-inch regulatory signs (next to the last two signal heads)

(v) One CCTV camera halfway on the arm

(vi) Two video detection cameras (over the outside lane, and over the middle of the remaining length)

(vii) One Opticom device located 2 feet in from the end of the arm

(6) All poles shall also be designed for one 12-foot luminaire arm and one luminaire at the end of the luminaire arm. This allows longer luminaire arms to be installed in the future.

(c) Wind loading

The entire assembly shall be designed to meet the wind loading requirements of

VDOT IIM-S&B-90.2.

(d) Fatigue loading

The entire assembly shall be designed to meet the fatigue loading requirements of

VDOT IIM-S&B-90.2.

(e) Special designs

(1) Mast arm signal pole systems with a larger loading than specified above require a special design. Special designs shall be submitted to the County with sealed

Arlington County Department of Environmental Services 22 shop drawings and a letter from a Professional Engineer registered in the

Commonwealth of Virginia certifying that the design meets the requirements of this specification.

(2) Design shall include mast arm(s), luminaire arm, pole, baseplate, and anchor bolt analysis. Maximum arm and pole loads, stresses, and combined stress ratios shall be provided for each group load, as well as maximum pole dead load rotation.

(3) For anchor bolt forces, pole forces shall be positioned in such a manner to maximize the force on any individual bolt regardless of the actual bolt orientation with the pole. The design of anchor bolts shall result in a ductile steel failure prior to any sudden brittle failure of the concrete.

(4) Provide to the County shop drawings detailing the poles as designed. Shop drawings shall contain all component drawings necessary to fabricate the structure. Drawings shall at a minimum specify the pole height, arm length(s), pole and arm diameters at the base and tip, splice locations, bolt circle diameter, bolt diameters, and detailed drawings showing the handhole cover assemblies. The drawings shall also show the width, depth, length, and thickness of all material and list pertinent ASTM specification designations together with the tensile strength of metallic members.

5 Materials

(a) The materials used for construction shall meet the requirements in Table 4-2.

Table 63-2: Material Yields for Construction Components

Component ASTM Designation Minimum

Yield (ksi)

Pole shaft A595 or A572 55

Pole base A36 36

Galvanizing structure A123 —

Galvanizing hardware A153 —

Arm shaft A595 or A572 55

Arm connection A36 36

Arm connection bolts F3125 GALVD. TO A153 —

DTI washers ASTM F959 —

Luminaire arm shaft Per manufacturer 35

Luminaire arm casting A27GR.65-35 35

Luminaire arm connection bolts SAE GR.5 OR ASTM F3125 —

Plate and channel A36 36

Anchor bolts F1554 55

Arlington County Department of Environmental Services 23

Ornamental base Cast aluminum-356 F — ksi = kilopounds per square inch; DTI = direct tension indicating

(b) The manufacturer shall provide mill certifications for steel materials.

(c) All poles, arms, transformer bases, and hardware shall be galvanized with powder coating or painted as specified on the plans or by the Engineer prior to installation.

(d) Ornamental poles shall have a rust-resistant coating applied to the inside of the pole.

The color of the outside of the pole will be specified at time of order. All poles, arms, ornamental bases, and hardware shall use one of the following coating systems:

(1) Option 1:

(i) Primer = DuPont 25P Primer

(ii) Top Coat = DuPont 333 Imron

(2) Option 2:

(i) TGIC polyester powder at a minimum thickness of 2.0 mils

6 Pole Shafts

(a) There are four size categories of single-arm mast arm poles:

(1) 20 to 40 feet

(2) 42 to 48 feet

(3) 50 to 60 feet

(4) 62 to 66 feet

To achieve interchangeability between poles and foundations, all of the poles in a size category shall have the same base plate size and bolt pattern.

(b) There are four size categories of dual-arm mast arm poles:

(1) 20 to 40 feet

(2) 42 to 48 feet

(3) 50 to 60 feet

(4) 62 to 66 feet

The lengths listed are the longest arm. To achieve interchangeability between poles and foundations, all of the poles in a size category shall have the same base plate size and bolt pattern.

(c) Pole shafts shall be 26 feet tall. The mast arm connection shall be located 15 feet above the base of the pole. The luminaire arm connection shall be located 25 feet and 6 inches above the base of the pole.

Arlington County Department of Environmental Services 24

Truncated pole shafts (poles without extra height for luminaires) shall be 2 feet taller than the top of the connection plate. The design of the pole should assume conditions for a pole with luminaire arm.

(d) The shaft shall be one piece, and contain no circumferential weld butt splices. The pole shaft shall have 16 sharp flutes and shall have a constant linear taper of 0.14 inch per foot. Laminated tubes or round poles with separate fluted sheeting are not permitted. The flutes shall terminate 6 inches above the base plate connection. The minimum thickness of steel shall be 7 gauge.

(e) Pole diameters at their connections to base plates shall not exceed the diameters listed in Table 4.3.

Table 63-3: Pole Design Shaft Diameter

Single-Mast Arm Poles Dual-Mast Arm Poles

Arm Length (ft) Max Dia. (in.) Arm Length (largest) (ft) Max Dia. (in.)

<40 18 <50 20

40-48 20 50+ 24

50+ 24 ft = feet; in. = inches; dia. = diameter

(f) Identification tag

Provide an identification tag affixed to the pole with the following information:

(1) Arlington County, VA

(2) Manufacturer

(3) Date of manufacture (MM/YY)

(4) Pole height and gage

(5) Arm length and gage

(6) Anchor bolt diameter and length

(7) Bolt circle diameter (on center of bolts)

(8) Serial number

The tag shall be attached between 4 feet and 5 feet above the base of the pole.

(g) Handholes

(1) An access hole and J-hook shall be provided on the opposite side of the pole shaft from the mast arm at the same elevation as the center of the mast arm.

The access hole at the mast arm height shall have an outside dimension of 4 inches by 6 inches exclusive of reinforcement. The handhole cover shall be

Arlington County Department of Environmental Services 25 attached to the inside of the pole with a chain to prevent dropping the handhole cover.

A second…