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| MATERIAL |
| A. Strength requirements for posts shall conform to ASTM F 1043. The product of the yield strength and section modulus shall not be less than that for pipe conforming to ASTM F 1083. |
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| B. Products shall be new from recognized, reputable manufacturers. The manufacturers shall have a minimum of 2 years experience. Used, re-rolled or re-galvanized material is not acceptable. |
| C. Welded Wire Fabric shall be fabricated from low carbon steel wire and electronically control welded, forming a specified mesh size. |
D. The wire shall conform to ASTM A 853 Grade AISI 1006, having a minimum tensile strength of 70,000 PSI (485 MPa.) After welding the fabric is hot-dipped, galvanized with a minimum 1.2 oz zinc/ft2
Note: Welded mesh is measured wire center to wire center, whereas, chain link mesh openings are measured inside to inside of the diagonal wires with 1/8" (3 mm) tolerance. I.e. Welded mesh wires located 21 inches oc (57 mm) and compared to 2 inch (51 mm) chain link have the same mesh openings. |
| E. Fabric Heights: |
1. Perimeter Fences typically 8-16 feet or as required single panel construction 1" x 3" X 10.5 gauge. (12.7 mm x 76 mm x 3.25 mm) panel size 7'-3" wide x required height (2.21m).
2. If required, buried fabric separate piece 1" x 3" x 10.5 gage (12.7 mm x 76mm x 3.25mm) panel size 7' - 3" x 2' high (2.21m x 0.61m) |
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| F. Framework: Framework strength and coating shall be in accordance with ASTM F 1043. |
1. Grade A Pipe, hot-dipped galvanized Schedule 40 pipe conforming to ASTM F 1043 Group 1A.
2. Grade B Pipe, Manufactured by cold rolling and radial frequency welding, the steel shall conform to ASTM F 1043 Group IC with a minimum yield strength of 50,000 PSI. (344.0 MPa.). Exterior and Interior coatings shall be in accordance with ASTM F 1043.
3. "C" post, manufactured by cold forming shall conform to ASTM F 1043 Group II with minimum yield strength of 60, 000 PSI. (413.7MPa) "C" post size 31 "x 21" x .130 wall. (83 mm x 64 mm x 3.3 mm)
4. Wind loads: Post shall withstand 70 M.P.H. minimum wind load.
5. Post Sizes, determined in accordance with previous approved practices Line, terminal and gate post shall not be less than 95% of the nominal weight conforming to (ASTM F 1043 Group 1A, 1C. and 11.)
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| a. "C" Post 31" x 21x 0.160 wall are acceptable.
"C" line post with flat attaching bars used to secure welded mesh to post. "C" post brackets spaced 15" o.c. also acceptable for attaching welded mesh to "C" line post. 4" diameter tubular post shall be used as terminal post, exceptions may apply to gate post. (See Section 3.1-K) |
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| 7. Rail Size |
a. 1-5/8" diameter rails located at the top and bottom of the fence.
b. "C" rails 1.625 x 1.25 x 0.80" wall are acceptable for top and bottom rail locations.
c. Secure welded mesh to rails with 9 gauge tie wires (Section 2.1G 5,6, and 7) |
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| G. Fittings and Accessories |
1. Post Tops: Pressed steel or malleable iron, designed as a weather tight enclosure for tubular post. Weather tight enclosures not required for "C" post. Provide one cap for each exposed tubular post end, unless equal protection is afforded by combining post top and barbed wire supporting arm if used. Post caps not required for "C" post.
2. Preformed Power Twisted Ties: Fabric attachment to rails, 9 gauge ties for fabric sizes 10.5 gauge and larger. Ties shall be aluminized with a minimum coating of 0.40 oz. aluminum/ft2 or galvanized.
3. Tie Spacing for top rails are at intervals not exceeding 24",
(bottom rail tie spacing intervals not to exceed 12".
4. Line Post and Terminal Post Brackets: Spacing for line and terminal posts are at intervals not exceeding 15" See drawing for bracket locations. |
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| INSTALLATION |
| A. Installation of the Framework Components shall be in accordance with ASTM F 567 when applicable and as specified herein. Larger corner posts not required for welded mesh installations. |
B. Installation of Welded Wire Fabric components: follow the manufacturer's recommendations.
1. Tolerance: Top to bottom of panel one inch post to panel misalignment tolerance. This tolerance covers those areas where minor grade change can be accommodated, panels are out of square, occasional workmen's oversight and post out of plumb. |
| C. Site Preparation: Prior to the installation, all necessary grading and cleaning on both sides of fence shall be performed by the General Contractor or others responsible for site grading. |
1. Grading shall be done in such a manner as to provide a straight flat and
level surface, Soil or stone fill shall be thoroughly compacted.
2. All excavation shall be coordinated with respect to electrical and mechanical component installations. All existing utilities shall be located prior to starting excavation.
3. Erect the fencing in straight lines between angle points. Erect framework in accordance with ASTM F 567 and as approved by shop drawings. All fencing shall be grounded as shown on the drawing and as specified herein. (3.1 M).
Note: Grounding in section (3.1 M) shall be completed by electrical contractor. |
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| D. Minimum Post Hole Diameters for 2.375" (60 mm) are 10.0" (254 mm), 2.875" (73 mm) are 12.0" (305 mm, 4.0" (102 mm) are 16" (406 mm), 6.625" (168 mm) are 24.0" (610 mm), and 8.625" (219 mm) are 32.0" (813 mm) (Table 1 for Post Hole Depth.). |
| Post Hole Depth Table 1: |
| Exposed Height Of Fabric |
Line Post |
Corner/End Pull Post |
Setting Depth |
6 ft.
1.8 m |
2.375
60 mm |
2.375
60 mm |
30
762 mm |
7 ft.
2.1 m |
2.375
60 mm |
2.375
60 mm |
33
838 mm |
8 ft.
2.4 m |
2.375
60 mm |
2.375
60 mm |
36
914 mm |
9 ft.
2.7 m |
2.875
73 mm |
2.875
73 mm |
39
990 mm |
10 ft.
3 m |
2.875
73 mm |
2.875
73 mm |
42
1066 mm |
11 ft.
3.4 m |
2.875
73 mm |
2.875
73 mm |
45
1143 mm |
12 ft.
3.7 m |
2.875
73 mm |
2.875
73 mm |
48
1219 mm |
13 ft.
4 m |
2.875
73 mm |
2.875
73 mm |
51
1295 mm |
14 ft.
4.3 m |
4.0
102 mm |
4.0
102 mm |
54
1372 mm |
15 ft.
4.6 m |
4.0
102 mm |
4.0
102 mm |
57
1447 mm |
16 ft.
4.9 m |
4.0
102 mm |
4.0
102 mm |
60
1524 mm |
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| Note: Posts depths shall be a minimum of 24", (610 mm) plus 3" (76 mm) for each 1 - Ft. (.305 m) increase in the fence height over 4 ft. (1.2 m) (ASTM A 567) |
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E. Post Holes in Solid Rock or Concrete: Drill holes into solid rock or concrete 1/2" (13 mm) wider than pipe diameter, and 18" (457 mm) deep for end, corner and gate posts and 12" (305 mm) deep for line post.
Half-fill the void with non-shrinkable grout and force the post to the bottom of the hole, leaving no voids. Crown the grout to shed water. The use of sleeves in new concrete is recommended. |
| F. Concrete Mix: Shall be in accordance with ASTM C 94 with maximum 3/4" (19 mm) aggregate, and having a minimum compression strength of 3000 PSI (20.69 MPa.) at 28 days. Concrete shall be thoroughly worked into the post holes leaving no voids. |
| G. Allow concrete to cure a minimum of (7 days) before installing fence fabric or fittings. The top surface of the post footing shall have a crown water shed finish. |
| H. Post Spacing: Space post equal distance in the fence line to a maximum of 81' on center (2.4 m). No terminal posts larger than line post required, except for gate post; welded mesh requires no stretching. |
| I. Ground Cover: After the filter fabric is installed cover zone between fences with a 5" (127 mm) depth of crushed stone, 1" (25.4 mm) - 11" (38 mm) #2 aggregate. The filter fabric and stone should extend 6" (152 mm) beyond the exterior fence and up to the interior fence. |
| J. Rails: Install rails as called for on the drawings and in these Specifications. All rails shall be installed on the side of the fence which is being protected to provide the least access for climbing. No corner bracing required for welded wire fabric installations |
1. Top rails, with the use of 7" (178 mm) sleeve, shall run continuously through the top caps or extension arms. Bottom rails shall be connected to the line and terminal post using boulevards or bands and rail ends. Attachment bolts for bands shall be 5/16" (7.9 mm) x 1 1 " (38 mm) carriage bolts with nuts.
2. Boulevard bolts shall be 3/8" (10 mm) minimum in diameter. Bottom rails locations shall correspond with this specification and drawings.
3. Two way brace bands and rail ends may be used in place of boulevards. |
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| K. Welded Wire Fabric General: Welded wire panels are fabricated to correspond with the widths and heights specified. Welded mesh panels are attached with a combination of brackets and tie wire in accordance with the drawing. Option (1) Continuous flat bar drilled 12" (305 m) o.c. running top to bottom of exposed fabric. Option 2 Preformed 1" (25.4 mm) x 10 gage (3.4 mm) thick two piece brackets, zinc coated are secured to the line post with 5/16" (7.9 mm) carriage bolts. Terminal post connections are comprised of tension bands. Band spacing not exceed 15" (381 mm) for terminal post. See corner connection detail for securing tension bands. Continuous punched "C" post and flat bar method preferred over round post. |
| M. Grounding to the Earth: Grounding and bonding of the perimeter systems shall be in accordance with the N.E.C. (National Electric Code), N.E.S.C. (National Electric Safety Code) ASTM F 1916 and as specified herein. |
1. Fences crossing power lines of 600 volts or more shall be grounded at or near the point of crossing and at distances not exceeding 150 feet (46 m) on each side of crossing.
Where electronic detection is an integral part of the fence, grounding electrodes shall be installed at 200'. (61 m) intervals along the fence line (For additional information consult with the electronic system manufacturer.)
2. The grounding electrodes shall be a minimum 3/4"(19 mm) diameter x 10' (3 m) long copper clad rod, driven into the earth until the top is 12 in (305 mm) below grade. Attach a No. 2 AWG bare stranded copper conductor by exothermically welding to the ground rods and extend underground in the immediate vicinity of the fence post.
Secure the grounding conductor to the post with 5/16" (7.9 mm) self-tapping galvanized or stainless steel bolts and approved copper compression terminal ends or clamps.
3. After grounding connections have been completed, perform a ground resistance test in the presence of the Owner's Representative. The ground resistance shall not exceed 25 OHMS under normal dry conditions.
Where resistance requirements cannot be attained, install additional rods no closer than 6'. (1.8 m) on center. Install no more than two additional rods at each location.
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| CLEANING |
| CLEANUP: UPON COMPLETION OF THE INSTALLATION, CLEAN UP ALL WASTE MATERIAL RESULTING FROM THE FENCE CONSTRUCTION. |
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