Submittal Review (Rubric for assignment provided)

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SECTION 02820 CHAIN-LINK FENCES AND GATES

PART 1 GENERAL 1.01 SCOPE OF WORK

A. This Section includes the following:

1. Galvanized steel chain-link fabric. 2. Galvanized steel framework. 3. Grounding and bonding.

1.02 RELATED WORK (NOT USED) 1.03 SUBMITTALS The Contractor shall submit shop drawings in accordance with Section 01330, Submittals and Acceptance:

A. Product Data: Provide material descriptions, construction details, dimensions of individual components and profiles, and finishes for the products specified in this Section.

B. Product Certificates: Signed by manufacturers of chain-link fences and gates

certifying that products furnished comply with requirements.

C. Field Test Reports: Indicate and interpret test results for compliance of chain-link fence and gate grounding and bonding with performance requirements.

1.04 WORK SEQUENCE (NOT USED) 1.05 REFERENCE STANDARDS Reference standards and recommended practices referred to in this Specification Section shall be the latest revision of any such document in effect at the bid time. The following documents are a part of this Section. Where this Section differs from these documents, the requirements of this Section shall apply.

A. American Concrete Institute (ACI)

1. ACI 301—Specifications for Structural Concrete for Buildings.

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B. American Society for Testing and Materials (ASTM)

1. ASTM A53—Standard Specification for Pipe, Steel, Black and Hot- Dipped, Zinc-Coated, Welded and Seamless.

2. ASTM A121—Standard Specification for Metallic-Coated Carbon Steel Barbed Wire.

3. ASTM A392—Standard Specification for Zinc-Coated Steel Chain-Link Fence Fabric.

4. ASTM A780—Standard Practice for Repair of Damaged and Uncoated Areas of Hot-Dip Galvanized Coatings.

5. ASTM A824—Standard Specification for Metallic-Coated Steel Marcelled Tension Wire for Use With Chain Link Fence.

6. ASTM C33—Standard Specification for Concrete Aggregates. 7. ASTM C94—Standard Specification for Ready-Mixed Concrete. 8. ASTM C150—Standard Specification for Portland Cement. 9. ASTM C387—Standard Specification for Packaged, Dry, Combined

Materials for Mortar and Concrete. 10. ASTM F567—Standard Practice for Installation of Chain-Link Fence. 11. ASTM F626—Standard Specification for Fence Fittings. 12. ASTM F900—Standard Specification for Industrial and Commercial

Swing Gates. 13. ASTM F1043—Standard Specification for Strength and Protective

Coatings on Steel Industrial Chain Link Fence Framework. 14. ASTM F1083—Standard Specification for Pipe, Steel, Hot-Dipped Zinc-

Coated (Galvanized) Welded, for Fence Structures. 15. ASTM F1184—Standard Specification for Industrial and Commercial

Horizontal Slide Gates. 16. ASTM F2200—Standard Specification for Automated Vehicular Gate

Construction.

C. Institute of Electrical and Electronics Engineers

1. IEEE C2—National Electrical Safety Code (NESC) and Handbook Set. 2. IEEE 81—Guide for Measuring Earth Resistivity, Ground Impedance, and

Earth Surface Potentials of a Ground System (Part 1) Normal Measurements.

D. Occupational Safety and Health Administration

1. OSHA 29 CFR 1910.7—Definition and Requirements for a Nationally

Recognized Testing Laboratory.

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E. Underwriters Laboratories (UL)

1. UL 325—Standard for Gate Systems. 2. UL 467—Grounding and Bonding Equipment.

F. National Fire Protection Association (NFPA)

1. NFPA 70—National Electrical Code.

1.06 QUALITY ASSURANCE

A. Source Limitations for Chain-Link Fences and Gates: The Contractor shall obtain each color, grade, finish, type, and variety of component for chain-link fences and gates from one source with resources to provide chain-link fences and gates of consistent quality in appearance and physical properties.

1.07 WARRANTIES

A. Warranties shall be in accordance with Division 0, Bidding and Contracting Requirements, and Specification Section 01780, Warranties and Bonds.

1.08 DELIVERY, STORAGE, AND HANDLING

A. The Contractor shall adhere to the requirements specified in Section 01650, Delivery, Storage, and Handling, for storing and protecting the items specified in this Section.

B. Delivery, storage, and handling shall be in accordance with the manufacturer’s

recommendations. 1.09 QUALIFICATIONS

A. Installer Qualifications: An experienced installer who has completed chain-link fences and gates similar in material, design, and extent to those indicated for this Project and whose work has resulted in construction with a record of successful in-service performance.

1.10 TESTING REQUIREMENTS

A. Testing Agency Qualifications: A testing agency as defined by OSHA in 29 CFR 1910.7 or a member company of the International Electrical Testing Association and that is acceptable to authorities having jurisdiction.

1. Testing Agency's Field Supervisor: A person currently certified by the

International Electrical Testing Association or the National Institute for

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Certification in Engineering Technologies to supervise on-site testing specified in Part 3.

1.11 MAINTENANCE (NOT USED) 1.12 RECORD DRAWINGS (NOT USED) 1.13 PROJECT CONDITIONS

A. Field Measurements: The Contractor shall verify layout information for chain-link fences and gates shown on the Drawings in relation to the property survey and existing structures. Verify dimensions by field measurements.

1.14 DEFINITIONS

A. CLFMI: Chain Link Fence Manufacturers Institute. PART 2 PRODUCTS 2.01 GENERAL (NOT USED) 2.02 CHAIN-LINK FENCE FABRIC

A. Steel Chain-Link Fence Fabric: The Contractor shall provide fabric fabricated in one-piece widths for the fencing height shown on the Drawings. Comply with CLFMI's Product Manual and with requirements indicated below:

1. Mesh and Wire Size: 2-inch mesh, 0.192-inch diameter (6 gauge).

2. Height: As indicated in the Drawings.

3. Selvage: Twisted at top selvage and knuckled at bottom.

4. Zinc-Coated Fabric: ASTM A392, with zinc coating applied to steel wire

mesh fabric before or after weaving with the following minimum coating weight:

a. Class 2: Not less than 2.0 ounces per square foot.

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2.03 FENCE FRAMING

A. Round Steel Pipe: Comply with ASTM F1043, Material Design Group 1A Heavy Industrial Fence Framework, Schedule 40, galvanized steel pipe complying with ASTM F1083. External and internal coating Type A, and the following requirements:

1. Line Posts: 1.900-inch O.D. pipe weighing 2.72 lb/ft. 2. End Posts, Corner Posts, and Pull Posts: 2.375-inch O.D. pipe weighing

3.65 lb/ft. 3. Top Rail and Brace Rail: 1.660-inch O.D. pipe weighing 2.27 lb/ft.

B. Brace Rails: Provide brace rail with truss rod assembly for each gate, end, and

pull post. Provide two brace rails extending in opposing directions, each with truss rod assembly, for each corner post and for pull posts. Provide rail ends and brace bands for attaching rails to posts.

C. Top Rails: Fabricate top rail from lengths 21 feet or longer, with swedged-end or

fabricated for expansion-type coupling, forming a continuous rail along the top of chain-link fabric.

2.04 TENSION WIRE

A. General: The Contractor shall provide horizontal tension wire at the following locations:

1. Extended along top of fence fabric.

B. Metallic-Coated Steel Wire: 0.177-inch diameter (7 gauge), marcelled tension

wire complying with ASTM A824 and the following:

1. Coating: Type II, zinc coated (galvanized) with the following minimum coating weight:

a. Class 5: Not less than 2.0 ounces per square foot.

2.05 BARBED WIRE

A. General: The Contractor shall provide three horizontal strands of barbed wire at the following locations:

1. Above the top rail and fence fabric on 45-degree barbed wire arms.

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B. Metallic-Coated Steel Barbed Wire: Comply with ASTM A121, Design Number 12-4-5-14R, double 12-1/2 gauge twisted strand wire, with four-point 14 gauge round barbs spaced 5-inches on center and the following:

1. Strand Wire Coating: Type Z, zinc coated (galvanized) with the following

minimum coating weight:

a. Class 3: Not less than 0.80 ounce per square foot.

2. Barb Coating: Type Z, zinc coated (galvanized) with the following minimum coating weight:

a. Class 3: Not less than 0.70 ounce per square foot.

2.06 FITTINGS The Contractor shall do the following:

A. General: Provide fittings for a complete fence installation, including special fittings for corners. All fittings shall comply with ASTM F626.

B. Post and Line Caps: Pressed steel galvanized after fabrication having a minimum

zinc coating of 1.20 ounces per square foot. Provide weathertight closure cap for each post.

1. Provide line post caps with loop to receive top rail.

C. Rail and Brace Ends: Pressed steel galvanized after fabrication having a minimum

zinc coating of 1.20 ounces per square foot. Provide rail ends or other means for attaching rails securely to each gate, corner, pull, and end post.

D. Rail Fittings: Provide the following:

1. Top Rail Sleeves: Pressed steel galvanized after fabrication not less than

6 inches long. 2. Rail Clamps: Pressed steel galvanized after fabrication. Provide line and

corner boulevard clamps for connecting rails in the fence line to line posts.

E. Tension and Brace Bands: Galvanized pressed steel, minimum steel thickness of 12 gauge, minimum width of 3/4-inch and minimum zinc coating of 1.20 ounces per square foot.

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F. Tension Bars: Galvanized steel one-piece length 2 inches less than the fabric height. Provide one bar for each gate and end post and two for each corner and pull post. Minimum zinc coating of 1.20 ounces per square foot.

1. Bars for 2-inch mesh shall have a minimum cross section of 3/16-inch by

3/4-inch.

G. Truss Rod Assemblies: 3/8-inch diameter steel truss rod with a pressed steel tightener, minimum zinc coating of 1.20 ounces per square foot, assembly capable of withstanding a tension of 2,000 pounds.

H. Tie Wires, Clips, Hog Rings, and Fasteners: Provide the following types

according to ASTM F626:

1. Rail Tie Wires: For attaching chain-link fabric to posts, rails, and frames, complying with the following:

a. Galvanized Steel Preformed Power-Fastened Wire Ties:

0.148-inch diameter (9 gauge) wire; minimum zinc coating thickness of 1.20 ounces for square foot.

2. Wire Hog Rings: For attaching chain-link fabric to horizontal tension

wires complying with the following:

a. Galvanized Steel: 0.148-inch diameter (9 gauge) wire; minimum zinc coating thickness of 1.20 ounces per square foot.

I. Pipe Sleeves: For posts set into concrete, provide preset hot-dip galvanized steel

pipe sleeves complying with ASTM A53, not less than 6 inches long with inside dimensions not less than 1/2 inch more than the outside dimension of the post and flat steel plate forming bottom closure.

J. Barbed Wire Arms: Pressed steel galvanized after fabrication, minimum zinc

coating of 1.20 oz/sq ft, capable of supporting a vertical 250-lb load complying with the following:

1. Type I: Three strand 45-degree arm.

2.07 SWING GATES

A. General: Comply with ASTM F900 for the following swing-gate types:

1. Single gate. 2. Double gate.

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B. Fence Fabric: Match gate fabric to that of the fence system.

C. Round Steel Pipe: Comply with ASTM F1043, Material Design Group 1A Heavy Industrial Fence Framework, Schedule 40, galvanized-steel pipe complying with ASTM F1083.

D. Frames and Bracing: Fabricate members from galvanized steel tubing with

outside dimension and weight according to ASTM F900 and fence height shown on the Drawings and within this Specification. Welded joints shall be protected by applying zinc-rich paint in accordance with ASTM A780.

E. Frame Corner Construction: As follows:

1. Welded or assembled with corner fittings and 5/16-inch-diameter

adjustable truss rods for panels 5 feet wide or wider.

F. Gate Posts: Fabricate members from round galvanized steel pipe with outside dimension and weight according to ASTM F900 for each gate leaf as follows:

1. Up to 6-feet wide: 3.500-inch O.D. pipe weighing 7.58 lb/ft. 2. Over 6-feet wide and up to 13-feet wide: 4.000-inch O.D. pipe weighing

9.12 lb/ft. 3. Over 13-feet wide and up to 18-feet wide: 6.625-inch O.D. pipe weighing

18.99 lb/ft. 4. Over 18-feet wide: 8.625-inch O.D. pipe weighing 28.58 lb/ft.

G. Hardware: Latches permitting operation from both sides of the gate, hinges, and

keepers. Fabricate latches with integral eye openings for padlocking; the padlock shall be accessible from both sides of the gate.

2.08 HORIZONTAL SLIDE GATES

A. General: Comply with ASTM F1184 Type II for the following slide-gate types:

1. Class 2 – Internal Roller Design.

B. Fence Fabric: Match gate fabric to that of the fence system.

C. Round Steel Pipe: Comply with ASTM F1043, Material Design Group 1A Heavy Industrial Fence Framework, Schedule 40, galvanized-steel pipe complying with ASTM F1083.

D. Frames and Bracing: Fabricate members from galvanized steel tubing or

aluminum tubing with outside dimension and weight according to ASTM F1184 Type II and fence height shown on the Drawings and within this Specification.

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Top horizontal member to be one-piece extruded section having an integral internal track to accommodate truck assemblies. Vertical and horizontal members shall be located no greater than 8 feet apart. The length of back frame support section shall be a minimum of 40% of the opening. Class 2 cantilever slide gates shall comply with the performance deflection criteria listed in ASTM F1184. Gates shall be designed to open or close by applying an initial pull force no greater than 40 lb. Internal truck assemblies designed to handle the forces required for gate size opening and height. Welded joints shall be protected by applying zinc-rich paint in accordance with ASTM A780.

E. Gate Posts: Fabricate members from round galvanized steel pipe with outside

dimension and weight according to ASTM F1184 as follows:

1. 4.000-inch O.D. pipe weighing 9.12 lb/ft.

F. Frame Corner Construction: As follows:

1. Welded or assembled with corner fittings and 5/16-inch-diameter adjustable truss rods for panels.

G. Hardware: Internal rollers shall consist of two swivel-type trucks having sealed

lubricated ball bearing wheels and a means to ensure that the trucks remain properly aligned in the track during all normal operations of the gate.

2.09 GATE OPERATORS

A. General: Electrically operated gates and accessories must be manufactured and installed to comply with the safety requirements of ASTM F2200 and UL 325. Comply with NFPA 70.

The Contractor shall do the following:

1. Provide a factory-assembled automatic operating system designed for gate

size, type, weight, and operation frequency. Provide operation control system with characteristics suitable for Project conditions, with remote control stations, safety devices, and weatherproof enclosures. Coordinate electrical requirements with the site electrical system.

2. Provide an operator with a design that enables the motor to be removed without disturbing limit-switch adjustment and without affecting the auxiliary emergency operator.

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3. Provide the operator with UL-approved components. 4. Provide electronic components with a built-in troubleshooting diagnostic

feature. 5. Provide a unit designed and wired for both right-hand/left-hand opening,

permitting universal installation.

B. Motor Characteristics: 1. Motors shall be sufficient to start, accelerate, and operate connected loads

at designated speeds, within the installed environment, with an indicated operating sequence, and without exceeding the nameplate rating or considering service factor. Motors shall comply with NEMA MG 1, and the following:

a. Voltage, phase: 460V, 3-phase. b. Horsepower: 2 horsepower. c. Enclosure: Totally enclosed fan cooled (TEFC). d. Duty: Continuous duty at an ambient temperature of 105°F and at

an altitude of 3,300 feet above sea level. e. Service Factor: 1.15 or greater.

C. Gate Operators

1. Gate operators shall be concrete base/pad mounted and as follows:

a. Hydraulic slide gate operators. b. Operator shall be HySecurity Gate Operator Model 222 EX-ST

with Smart touch controller or an approved equal.

D. Operation

1. Operation shall be by means of a metal rail passing between a pair of solid metal wheels with polyurethane treads. Operator motors shall be hydraulic, roller type, and the system shall not include belts, gears, pulleys, roller chains, or sprockets to transfer power from operator to gate panel. The operator shall generate a minimum horizontal pull of 300 pounds without the drive wheels slipping and without the distortion of supporting arms. The operator shall be capable of handling gates weighing up to 4,000 lb. Gate panel velocity shall not be less than 2.0 feet per second and shall be stopped gradually to prevent shock loads to the gate and operator assembly. The 'soft stop' feature of the gate operator shall be controlled by two adjustable hydraulic brake valves (one for each direction). The "soft start" feature shall allow the pump to start at zero pressure and then progressively increase the pressure over a period no less than 2 seconds to 1,000 psi.

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2. Standard mechanical components shall include as a minimum:

a. Supporting arms: Cast aluminum channel. Arms shall incorporate a

fully brushed 1-1/2 foot bronze bearing surface, acting on arm pivot pins (Item b below).

b. Arm pivot pins: 3/4 inch-diameter, stainless steel, with integral tabs for ease of removal.

c. Tension spring: 2-1/2-inch heavy-duty, 800-pound capacity. d. Tension adjustment: Finger tightened nut, not requiring the use of

tools. e. Drive release: Must instantly release tension on both drive wheels,

and disengage them from contact with drive rail in a single motion, for manual operation.

f. Limit switches: Fully adjustable, toggle types, with plug connection to control panel.

g. Electrical enclosure: Oversized, metal, with hinged lid gasketed for protection from intrusion of foreign objects and providing ample space for the addition of accessories.

h. Chassis: 1/4-inch steel base plate, and #10 Ga. sides and back welded and ground smooth.

i. Cover: #16 Ga. galvanized sheet metal with a powder paint finish. All joints welded, tilled, and ground smooth. Finished corners square and true with no visible joints.

j. Finish: Fully zinc-plated then finished with a coat of high gloss powder paint withstanding a 1,000-hour salt spray test.

k. Drive wheels: 8-inch diameter. Metal hub with polyurethane tread. l. Drive rail: Shall be extruded 6061 to no less than 1/8-foot thick.

The drive rail shall incorporate alignment pins for ease of replacement or splicing. Pins shall enable a perfect butt splice.

m. Hydraulic hose: Shall be 1/4-inch synthetic, rated to 2,750 psi. n. Hydraulic valves: Shall be individually replaceable cartridge type,

in an integrated hydraulic manifold. o. Hose fittings: At manifold shall be quick-disconnect type. Others

shall be swivel type. p. Hydraulic fluid: High-performance type with a viscosity index

greater than 375. q. A 0 to 2,000-psi pressure gauge, mounted on the manifold for

diagnostics, shall be a standard component. r. The hydraulic fluid reservoir shall be formed from a single piece of

metal, non-welded, and shall be powder painted on the inside and the outside to prevent fluid contamination.

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3. Minimum standard electrical components: a. Pump motor: Shall be a 2-hp, 3-phase, 460 volt, 56 C, TEFC,

continuous duty motor, with a service factor of 1.15, or greater. b. All components shall have overload protection. c. Controls: Smart Touch Controller Board with 128K memory

containing:

(1) An inherent entrapment sensor. (2) A built\-in “warn before operate system.” (3) A built-in timer to close. (4) A liquid crystal display for the reporting of functions. (5) 19 programmable output relay options. (6) An anti-tailgate mode. (7) Built-in power surge/lightning strike protection. (8) The capability with optional software of event logging

EEPROM for trouble-shooting diagnostics. (9) An RS232 port for connection to laptop or other computer

peripheral and an RS485 connection of master/slave systems.

d. Transformer 75 VA, non-jumpered taps, for all common voltages. e. Control circuit: 24VDC.

E. Remote Controls

1. Each gate operator control system shall operate based on discrete signals (OPEN/CLOSE) provided by the vehicle loop detector and the key enter station. See the Drawings for additional requirements on key enter stations.

2. Vehicle Loop Detector

a. The vehicle loop detector system shall include an automatic

closing timer with an adjustable time delay before closing, a timer cut-off switch, and a loop detector designed to hold the gate open until traffic clears. Provide an electronic detector with adjustable detection patterns, adjustable sensitivity, and frequency settings, and a panel indicator light designed to detect the presence or transit of a vehicle over an embedded loop of wire and to emit a signal activating the gate operator. The Contractor shall provide the number of loops consisting of multiple strands of wire, number of

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turns, loop size, and method of placement at location shown on the Drawings, as recommended in writing by the detection system manufacturer for the function indicated.

b. Loop:

(1) Factory preformed in the size indicated; style saw-cut with epoxy-grouted installation.

F. Obstruction Detection Devices

1. Provide each motorized gate with automatic safety sensor(s). The

activation of the sensor(s) causes the operator to immediately function as follows:

a. Action

(1) Reverse gate in both opening and closing cycles and hold

until clear of obstruction.

b. Sensor Edge (1) Contact-pressure-sensitive safety edge, profile, and

sensitivity designed for type of gate and component indicated, in locations as follows. Connect to control circuit using the gate edge transmitter and operator receiver system.

(2) Along the entire gate leaf leading edge. (3) Along the entire gate leaf trailing edge.

c. Photoelectric/Infrared Sensor (1) System designed to detect an obstruction in gate’s path

when infrared beam in the zone pattern is interrupted.

G. Limit Switches

1. Limit switches shall be adjustable switches, interlocked with motor controls, and set to automatically stop the gate at fully retracted and fully extended positions.

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H. Emergency Release Mechanism

1. The emergency release mechanism shall be a quick-disconnect release of operator drive system of the following type of mechanism, permitting manual operation if operator fails. Design the system so the control circuit power is disconnected during manual operation.

2. Type a. Integral fail-safe release, allowing gate to be pushed open without

mechanical devices, keys, cranks, or special knowledge.

2.10 CAST-IN-PLACE CONCRETE

A. General: The Contractor shall comply with ACI 301 for cast-in-place concrete.

B. Materials: Portland cement complying with ASTM C150, aggregates complying with ASTM C33 and potable water for ready-mixed concrete complying with ASTM C94.

1. Concrete Mixes: Normal-weight concrete with not less than 3,000-psi

compressive strength (28 days), 3-inch slump, and 1-inch maximum size aggregate.

C. Materials: Dry-packaged concrete mix complying with ASTM C387 for normal-

weight concrete mixed with potable water according to the manufacturer's written instructions.

2.11 FENCE GROUNDING

A. Conductors: Bare, copper solid wire for No. 6 AWG and smaller; stranded wire for No. 4 AWG and larger.

B. Connectors and Ground Rods: Listed in UL 467:

1. Connectors for Below-Grade Use: Exothermic welded type.

2. Ground Rods: Copper-clad steel.

a. Size: 5/8 inch by 96 inches.

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PART 3 EXECUTION 3.01 EXAMINATION

A. The Contractor shall examine areas and conditions with the installer present for compliance with requirements for site clearing, earthwork, pavement work, and other conditions affecting performance.

1. Do not begin installation before final grading is completed. 2. Verify limits of existing wetlands to be traversed.

B. Proceed with installation only after unsatisfactory conditions have been corrected.

3.02 PREPARATION

A. The Contractor shall stake locations of fence lines, gates, and terminal posts. Locate all utilities, lawn sprinkler system, underground structures, benchmarks, and property monuments within the proposed fencing and gate layout shown on the Drawings, and report any interferences with these structures or utilities to the Engineer before beginning work.

3.03 INSTALLATION, GENERAL The Contractor shall do the following:

A. General: Install chain-link fencing to comply with ASTM F567 and more stringent requirements specified.

1. Install fencing on established boundary lines inside property line.

B. Post Setting: Set posts in concrete footing. Protect portion of posts above ground

from concrete splatter. Place concrete around posts and vibrate or tamp for consolidation. Verify that the posts are set plumb, aligned, and at the correct height and spacing, and hold the posts in position during placement and finishing operations until the concrete is sufficiently cured.

1. Dimensions and Profile: All posts shall be at least 6 feet tall with a 1-foot

barbed wire assembly and shall follow the alignment specified on the Drawings.

2. Exposed Concrete Footings: Extend concrete 2 inches above grade, smooth, and shape to shed water.

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3.04 CHAIN-LINK FENCE INSTALLATION The Contractor shall do the following:

A. Terminal Posts: Locate terminal end, corner, and gate posts in accordance with ASTM F567 and terminal pull posts at changes in horizontal or vertical alignment of 15º or more.

B. Line Posts: Space line posts uniformly at 10 feet o.c.

C. Post Bracing Assemblies: Install according to ASTM F567, maintaining plumb

position and alignment of fencing. Install braces at end and gate posts and at both sides of corner and pull posts. Locate horizontal braces at midheight of fabric on fences with top rail and at two-thirds fabric height on fences without top rail. Install so posts are plumb when diagonal rod is under proper tension.

D. Tension Wire: Install according to ASTM F567, maintaining plumb position and

alignment of fencing. Pull wire taut, without sags. Fasten fabric to tension wire with hog rings of the same material and finish as fabric wire, spaced a maximum of 18 inches o.c. Install tension wire in locations indicated before stretching fabric.

1. Bottom Tension Wire: Install tension wire 4 inches up from the bottom of

the fabric and tie to each post with not less than the same gauge and type of wire.

E. Top Rail: Install according to ASTM F567, maintaining plumb position and

alignment of fencing. Run rail continuously through line post caps, bending to radius for curved runs and terminating into rail end attached to posts or post caps fabricated to receive rail at terminal posts. Provide expansion couplings as recommended by the fencing manufacturer.

F. Intermediate Rails: Install in one piece at post-height center span, spanning

between posts, using fittings, special offset fittings, and accessories. G. Chain-Link Fabric: Apply fabric to inside of enclosing framework. Leave 2 inches

between finish grade or surface and bottom selvage, unless otherwise indicated. Pull fabric taut and tie to posts, rails, and tension wires. Anchor to framework so fabric remains under tension after pulling force is released.

H. Tension or Stretcher Bars: Thread through fabric and secure to end, corner, pull,

and gate posts with tension bands spaced not more than 12 inches o.c.

I. Tie Wires: Use wire of proper length to firmly secure fabric to line posts and rails. Attach wire at one end to chain-link fabric, wrap wire around post a minimum of

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180º and attach the other end to chain-link fabric in accordance with ASTM F626. Bend ends of wire to minimize hazard to individuals and clothing.

1. Maximum Spacing: Tie fabric to line posts 12 inches o.c. and to braces

24 inches o.c.

J. Fasteners: Install nuts for tension bands and carriage bolts on the side of the fence opposite the fabric side.

3.05 BARBED WIRE INSTALLATION

A. Barbed Wire: Stretched taut between terminal posts and secured in the slots provided on the line post barb arms. Attach each strand of barbed wire to the terminal post using a brace band.

3.06 GATE INSTALLATION

A. General: The Contractor shall install gates according to the manufacturer's written instructions, level, plumb, and secure for full opening without interference. Attach fabric in the same way as fencing. Attach hardware using tamper-resistant or concealed means. Install ground-set items in concrete for anchorage. Adjust hardware for smooth operation and lubricate where necessary.

3.07 GATE OPERATOR INSTALLATION

A. The Contractor shall comply with NFPA 70 and the manufacturer's written instructions for grounding of electric-powered motors, controls, and other devices.

B. General

1. The Contractor shall install gate operators according to the manufacturer's

written instructions, aligned and true to fence line and grade.

C. Excavation for Concrete Bases/Pads

1. The Contractor shall hand-excavate holes for bases/pads in firm, undisturbed soil to dimensions and depths and at locations as required by the gate operator component manufacturer's written instructions and as indicated.

D. Concrete Bases/Pads

1. The Contractor shall provide cast-in-place or precast concrete, at a depth

not less than 12 inches, dimensioned and reinforced according to the gate

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operator component manufacturer's written instructions and as indicated on the Drawings.

E. Vehicle Loop Detector System

1. The Contractor shall cut grooves in pavement and bury and seal wire loop

according to the manufacturer's written instructions. Connect to equipment operated by the detector.

3.08 GROUNDING AND BONDING The Contractor shall do the following:

A. Fences Enclosing Electrical Power Distribution Equipment: Ground as required by IEEE C2, unless otherwise indicated.

B. Grounding Method: At each grounding location, drive a ground rod vertically

until the top is 6 inches below finished grade. Connect rod to fence with No. 6 AWG conductor. Connect conductor to each fence component at the grounding location, including the following:

1. Each Barbed Wire Strand. Make grounding connections to barbed wire

with wire-to-wire connectors designed for this purpose.

C. Bonding Method for Gates: Connect bonding jumper between the gate post and gate frame.

D. Connections: Make connections so the possibility of galvanic action or

electrolysis is minimized. Select connectors, connection hardware, conductors, and connection methods so metals in direct contact will be galvanically compatible.

1. Use electroplated or hot-tin-coated materials to ensure high conductivity

and to make contact points closer in order of galvanic series. 2. Make connections with clean, bare metal at points of contact. 3. Coat and seal connections having dissimilar metals with inert material to

prevent future penetration of moisture to contact surfaces. 3.09 FIELD QUALITY CONTROL

A. Ground-Resistance Testing Agency: The Contractor shall engage a qualified independent testing agency to perform field-quality control testing.

B. Ground-Resistance Tests: Subject completed grounding system to a megger test at

each grounding location. Measure ground resistance not less than 2 full days after

03860-046-01 CHAIN-LINK FENCES AND GATES January 2017 02820-19

the last trace of precipitation, without the soil having been moistened by any means other than natural drainage or seepage and without chemical treatment or other artificial means of reducing natural ground resistance. Perform tests by the two-point method according to IEEE 81.

C. Desired Maximum Grounding Resistance Value: 25 ohms.

D. Excessive Ground Resistance: If resistance to ground exceeds desired value, the

Contractor shall provide recommendations to reduce ground resistance and a proposal to accomplish the recommended work.

E. Report: The Contractor shall prepare test reports, certified by the testing agency,

of ground resistance at each test location. Include observations of weather and other phenomena that may affect test results.

3.10 ADJUSTING

A. Gate: The Contractor shall adjust the gate to operate smoothly, easily, and quietly, free from binding, warp, excessive deflection, distortion, nonalignment, misplacement, disruption, or malfunction throughout the entire operational range. Confirm that latches and locks engage accurately and securely without forcing or binding.

B. Lubricate hardware and other moving parts.

3.11 DEMONSTRATION

A. The Contractor shall engage a factory-authorized service representative to train the Owner's personnel to adjust, operate, and maintain gates.

END OF SECTION