A.
B.
Quality assurance.
(1)
Reference standards.
(a)
American Society for Testing and Material (ASTM):
[1]
A53, Pipe, steel, black and hot-dipped, zinc coated, welded
and seamless.
[2]
A121, Zinc coated (galvanized) steel barbed wire.
[3]
A123, Zinc (hot dipped galvanized) coatings on iron and steel
products.
[4]
A392, Zinc coated steel chain-link fence.
[5]
F567, Practice for installation of chain-link fence.
[6]
F626, Fence fittings.
[7]
F043, Strength and protective coatings on metal industrial chain
link fence framework.
[8]
F1083, Pipe, steel, hot-dipped zinc coated (galvanized) welded
for fence structures.
C.
Submittals: manufacturer's catalogue cuts indicating material
compliance.
E.
Products delivery, storage and handling. During loading, transporting
and unloading, exercise care to prevent damage to materials.
A.
Chain link fence fabric.
(1)
Two-inch diamond mesh of high-quality medium carbon steel core wire,
hot-dipped galvanized. Minimum tensile strength shall be 100,000 psi,
nine-gage wire size.
(2)
Wire shall be imprinted with identification of manufacturer or trade
name, country of origin, gage and tensile strength at twelve-inch
intervals.
(3)
Twist and barb top selvage. Twist and knuckle bottom selvage.
B.
Posts.
(1)
Line posts shall be two-and-one-half-inch O.D. tubular steel pipe,
SS40.
(2)
End, corner, angle or pull posts shall be three-inch O.D. tubular
steel pipe, SS40.
(3)
Gate posts shall be four-inch O.D. tubular steel pipe or SS40, for
each seven feet to 12 feet gate leaf.
(4)
All posts shall be hot-dipped galvanized.
C.
Framing and bracing.
(1)
Top rail and bracing rail shall be one-and-five-eighths-inch O.D.
tubular steel pipe (SS40), hot-dipped galvanized.
(2)
Bracing ends (for fastening to posts) shall be formed steel.
(3)
Truss rods shall be steel rods with minimum diameter of three-eighths-inch.
(4)
All framing shall be hot-dipped galvanized.
D.
Concrete bases: concrete minimum twenty-eight-day compressive strength
of 3,000 psi.
E.
Barbed wire and supports.
(1)
Barbed wire shall be galvanized steel double-wire strands, twisted.
Four-point barbs shall be spaced approximately three inches on center.
(2)
Barbed wire supports shall be twelve-gage pressed steel or malleable
iron set 45° (inward or outward) from posts. Supports shall withstand
250 pounds downward pull at end without failure.
(3)
Three rows bar bed wire shall be attached to supports.
(4)
Double V support arms, where specified, shall support six strands
of barbed wire.
F.
Hardware and accessories.
(1)
Top rail sleeves (for expansion and contraction of top rail) shall
be six inches long.
(2)
Wire ties, nine-gauge galvanized steel for line post attachment.
Double wrap thirteen-gauge shall be used for attachments to rails
and braces.
(3)
Nuts and bolts shall be galvanized.
(4)
Post caps shall be formed steel, cast malleable iron or aluminum
alloy weathertight closure cap.
(5)
Tension wire, seven-gauge core wire, galvanized, with tensile strength
of 75,000 psi. Hog ring ties twelve-and-one-half-gauge wire shall
be used to tie fabric to tension wire.
(6)
Stretcher bar, 3/16 inches by 2/4 inches steel bar or equivalent
fiberglass rod. Length shall be two inches less than full height of
fabric sheer fabric meets terminal posts.
G.
Swing gates.
(1)
Gate frames shall be two-inch O.D. tubular steel pipe SS40. Connections
shall be welded to form rigid one-piece unit.
(2)
Hinges shall be structurally capable of supporting gate leaf and
allow 180° of movement without binding. Non-lift-off-type hinge
design.
(3)
A latch shall be a forked type capable of retaining a gate in a closed
position and have provisions for a padlock. A latch shall permit operation
from either side of the gate.
(4)
Keeper. Provide keeper for each leaf over five feet wide. The keeper
shall secure the free end of the gate when fully open until manually
released.
(5)
For double-leaf gates, provide drop rod to hold inactive leaf and
gate stop pipe to engage center drop rod.
(6)
Padlock. Provide one padlock to lock both gate leaves with three
keys. Lock shall conform to Fed. Spec. FF-P-10 lb Type EPA with chain.
(7)
Gate posts shall have heavy ornamental caps.
A.
General.
(1)
Ensure property lines and legal boundaries of work are clearly established.
(2)
Grade areas to receive fencing to eliminate surface irregularities
to maintain required clearance.
(3)
Install four-foot high fence around stormwater basins. Six-foot high
fence with barbed wire shall be installed at pump station sites or
as otherwise directed.
B.
Posts.
(1)
Place terminal post at each fence termination and change in horizontal,
or vertical direction of 30° or more. Space line posts at equidistant
spaces minimum eight feet, 10 feet maximum on centers.
(2)
Drill holes in firm, undisturbed or compacted soil. Holes shall have
diameter four times greater than outside dimension of post and depth
approximately six inches deeper than bottom of post forty-two-inch
minimum depth). Excavate deeper as required for adequate support in
soft or loose soils and for posts with heavy lateral loads.
(3)
Place concrete around posts in a continuous pour. Top of concrete
shall be one inch to two inches above surrounding grade and sloped
to direct water away from posts. Maintain position of post (vertically
and horizontally) during placement operations.
(4)
If solid rock is encountered during drilling, core drill a hole one
inch larger in diameter than the post and 12 inches deep. Grout the
post in place.
C.
Bracing.
(1)
Install horizontal brace at midheight for fences six feet and higher
on each side of terminal posts. Install diagonal truss rods, at same
posts, adjusting to ensure posts remain plumb.
(2)
Connect top rails with sleeves. Install bottom rails if required.
(3)
Install tension wire at bottom of fabric before stretching fabric
and attach to each post with ties.
D.
Fabric.
(1)
Attach fence fabric so that fabric remains in tension after pulling
force is released. Allow two inches clear space between finished ground
and bottom selvage.
(2)
Attach fabric to bracing, rails and line posts with wire ties ±
15 inches on center. Attach fabric to tension wire, if any, with hog
ties at 24 inches on center.
(3)
Bend ends of wire ties to minimize hazard to persons.
(4)
Thread tension bar through taut fabric and attach bar to terminal
posts with bands or clips spaced at 15 inches.
E.
Barbed wire. Uniformly space strands of barbed wire on the support
arms. Each strand shall be pulled taut and securely fastened by clips
or in slots of each support.
F.
Gates.
(1)
Swinging gates. Set posts in concrete and attach fabric. Locate and
place gate stops so that drop rod fully engages. Attach hardware by
means which will prevent unauthorized removal. Adjust hardware for
smooth operation of gate leaves.
(2)
Sliding gates. Set posts, rollers, framing and bracing for smooth
operation. Place gate stops. Adjust hardware.
G.
Cleanup. Clean up debris and unused material and remove from the
site.
