3._Fence_Installation_(Attachment_3).pdf

Item: 4

Install Supply Cage Mod:

SD-02 Shop Drawings

Erecation / Installation

Execution Guidelines For Fencing at Travis AFB. Apply the following as needed per individual application:

FENCE INSTALLATION Perform complete installation conforming to ASTM F567.

3.1.1 Line and Grade

Install fence to the lines and grades indicated. Clear the area on either side of the fence line to the extent indicated. Space line posts equidistant at intervals not exceeding 3 m 10 feet. Terminal

(corner, gate, and pull) posts shall be set at abrupt changes in vertical and horizontal alignment.

Provide fabric continuous between terminal posts; however, runs between terminal posts shall not exceed 152.4 m 500 feet. Repair any damage to galvanized surfaces, including welding, with paint containing zinc dust in accordance with ASTM A780/A780M.

3.1.2 Excavation

Clear all post holes of loose material. Spread waste material where directed. Eliminate ground surface irregularities along the fence line to the extent necessary to maintain a [25] [50] mm [1]

[2] inch clearance between the bottom of the fabric and finish grade. [3.1.3 Concrete Slabs and Walls NOTE: Use the following paragraph where required by the design, otherwise delete. Sleeve joints for nonremovable fence sections are usually filled with lead or nonshrink grout.

Removable fence sections may be useful as an economical means for providing access to equipment. Sleeve joints in removable fence sections may be a tight sliding type, or where moisture entry could be a problem, filled with pipe sulphur jointing compound.

************************************************************************** Set posts into zinc-coated sleeves, set in concrete slab or wall, to a minimum depth of 300 mm 12 inches. Fill sleeve joint with lead, nonshrink grout, or other approved material. Set posts for support of removable fence sections into sleeves that provide a tight sliding joint and hold posts aligned and plumb without use of lead or setting material. ]3.2 POST INSTALLATION NOTE: For fences over 1.83 m 6 feet tall in areas of frequent high winds (113 kph (70 mph) or greater), specify hole diameters of 406 mm 16 inches for terminal posts and 305 mm 12 inches for line posts.

3.2.1 Earth and Bedrock a. Set posts plumb and in alignment. Except where solid rock is encountered, set posts in concrete to the depth indicated on the SECTION 32 31 13.53 Page 14 drawings. Where solid rock is encountered with no overburden, set posts to a minimum depth of

457 mm 18 inches in rock. Where solid rock is covered with an overburden of soil or loose rock, set posts to the minimum depth indicated on the drawing unless a penetration of 457 mm 18 inches in solid rock is achieved before reaching the indicated depth, in which case terminate depth of penetration. Grout all portions of posts set in rock. b. Portions of posts not set in rock shall be set in concrete from the rock to ground level. Posts set in concrete shall be set in holes not less than the diameter shown on the drawings. Make diameters of holes in solid rock at least

25 mm 1 inch greater than the largest cross section of the post. Thoroughly consolidate concrete and grout around each post, free of voids and finished to form a dome. Allow concrete and grout to cure for 72 hours prior to attachment of any item to the posts. Group II line posts may be mechanically driven, for temporary fence construction only, if rock is not encountered. Set driven posts to a minimum depth of 914 mm 3 feet and protect with drive caps when setting. c.

Test fence post rigidity by applying a 222.4 newtons 50 pound force on the post, perpendicular to the fabric, at 1.52 m 5 feet above ground. Post movement measured at the point where the force is applied shall be less than or equal to 19 mm 3/4 inch from the relaxed position. Test every tenth post for rigidity. When a post fails this test, make further tests on the next four posts on either side of the failed post. All failed posts shall be removed, replaced, and retested at the

Contractor's expense. [

3.2.2 Concrete Slabs and Walls

NOTE: Use the following paragraph where required by the design, otherwise delete. Sleeve joints for nonremovable fence sections are usually filled with lead or nonshrink grout.

Removable fence sections may be useful as an economical means for providing access to equipment. Sleeve joints in removable fence sections may be a tight sliding type, or where moisture entry could be a problem, filled with pipe sulphur jointing compound.

************************************************************************** Set posts into zinc-coated sleeves, set in concrete slab or wall, to a minimum depth of 300 mm 12 inches. Fill sleeve joint with lead, nonshrink grout, or other approved material. Set posts for support of removable fence sections into sleeves that provide a tight sliding joint and hold posts aligned and plumb without use of lead or setting material. ]

3.3 RAILS

NOTE: Top Rails are normally not applicable to High Security Installations

************************************************************************** Bolt bottom rail to double rail ends and securely fasten double rail ends to the posts. Peen bolts to prevent easy removal. Install bottom rail before chain link fabric. [Provide 3/8" diameter eye hook anchored into SECTION 32 31 13.53 Page 15 concrete footing at midpoint.]

3.4 FABRIC INSTALLATION

NOTE: Normally the bottom of fence fabric will be installed no higher than 50 mm 2 inches from the ground. For Air Force projects, high security fence fabric will be installed no higher than 25 mm 1 inch from the ground. The height requirement for fence fabric will be verified with the user. In areas where the soil along the fence line is prone to erosion, measures should be taken to maintain the level of security for which the fence is designed. Tension requirements are for high security fence applications. Fabric fastening requirement of 300 mm 12 inch spacing to top tension wire and bottom rail is a high security fence requirement.

************************************************************************** a.

Install chain link fabric on the side of the post indicated. Attach fabric to terminal posts with stretcher bars and tension bands. Space bands at approximately 381 mm 15 inch intervals. Install fabric and pull taut to provide a smooth and uniform appearance free from sag, without permanently distorting the fabric diamond or reducing the fabric height. Fasten fabric to line posts at approximately 381 mm 15 inch intervals and fastened to all rails and tension wires at approximately [610] [305] mm [24] [12] inch intervals. b. Cut fabric by untwisting and removing pickets. Accomplish splicing by weaving a single picket into the ends of the rolls to be joined.

The bottom of the installed fabric shall be [50] [25] mm plus or minus 13 mm [2] [1] plus or minus 1/2 inch above the ground. c. After the fabric installation is complete, exercise the fabric by applying a 222 newtons 50 pound push-pull force at the center of the fabric between posts;

the use of a 133 newtons 30 pound pull at the center of the panel shall cause fabric deflection of not more than 63.5 mm 2.5 inches when pulling fabric from the post side of the fence; every second fence panel shall meet this requirement; resecure and retest all failed panels at the

Contractor's expense.

3.5 SUPPORTING ARMS

Install barbed wire supporting arms and barbed wire as indicated on the drawings and as recommended by the manufacturer. Anchor supporting arms [to the posts in a manner to prevent easy removal with hand tools] [with 9.5 mm 3/8 inch diameter plain pin rivets or, at the

Contractor's option, with studs driven by low-velocity explosive-actuated tools for steel, wrought iron, ductile iron, or malleable iron. Studs driven by an explosive-actuated tool shall not be used with gray iron or other material that can be fractured. Use a minimum of two studs per support arm.] Pull barbed wire taut and attach to the arms with clips or other means that will prevent easy removal. SECTION 32 31 13.53 Page 16 [

3.6 BARBED TAPE INSTALLATION

NOTE: Barbed tape is a high security fence option when required.

Install stainless steel reinforced barbed tape as detailed on the drawings. Stretch out barbed tape to its manufacturer's recommended length, set on top of the barbed wire and "V" shaped support arms, then secure it to the barbed wire. Secure the barbed tape to the barbed wire at the two points and at every spiral turn of both coils as shown on the drawings. Install stainless steel

[reinforced][non-reinforced] barbed tape for ground applications [in accordance with manufacturer's recommendations][as shown on the drawings]. ]

3.7 GATE INSTALLATION a. Install gates at the locations shown. Mount gates to swing as indicated. Install latches, stops, and keepers as required. Install [Slide] [Lift] gates as recommended by the manufacturer. b. Attach padlocks to gates or gate posts with chains. Weld or otherwise secure hinge pins, and hardware assembly to prevent removal. c. Submit [6]

[_____] copies of operating and maintenance instructions, a minimum of 2 weeks prior to field training. Operating instructions shall outline the step-by-step procedures required for system startup, operation, and shutdown. Include the manufacturer's name, model number, service manual, parts list, and brief description of all equipment and their basic operating features.

Include in the maintenance instructions routine maintenance procedures, possible breakdowns and repairs, and troubleshooting guide. Also include the general gate layout, equipment layout and simplified wiring and control diagrams of the system as installed.

3.8 GROUNDING

NOTE: Delete this paragraph if grounding is not required. If grounding is required and lightning protection is not part of project design, the requirements in the second set of brackets will be used in lieu of those in the first set of brackets. Provide fence grounding details when composite type posts are specified where grounding of the fence is required.

************************************************************************** a.

Ground fencing as [indicated on drawings][and][specified]. b. [Ground fences crossed by overhead powerlines in excess of 600 volts. Electrical equipment attached to the fence shall be grounded.] c. [Ground fences on each side of all gates, at each corner, at the closest approach to each building located within 15 m 50 feet of the fence, and where the fence alignment changes more than 15 degrees. Grounding locations shall not exceed 198 m 650 feet. Bond each gate panel with a flexible bond strap to its gate post. Ground fences SECTION 32 31 13.53 Page 17 crossed by powerlines of 600 volts or more at or near the point of crossing and at distances not exceeding 45 m 150 feet on each side of crossing.] d. [Provide ground conductor consisting of

No. 8 AWG solid copper wire. Grounding electrodes shall be 19 mm 3/4 inch by 3.05 m 10 foot long copper-clad steel rod. Drive electrodes into the earth so that the top of the electrode is at least 152 mm 6 inches below the grade. Where driving is impracticable, electrodes shall be buried a minimum of 305 mm 12 inches deep and radially from the fence. The top of the electrode shall not be less than 610 mm 2 feet or more than 2.4 m 8 feet from the fence. Clamp ground conductor to the fence and electrodes with bronze grounding clamps to create electrical continuity between fence posts, fence fabric, and ground rods. Total resistance of the fence to ground shall not be greater than 25 ohms.] [

3.9 SECURITY

NOTE: Delete this paragraph if new fencing does not involve relocation or replacement of existing security fencing. Depending on nature of fence work, paragraph may need further elaboration regarding necessary construction to maintain perimeter.

Install new security fencing, remove existing security fencing, and perform related work to provide continuous security for facility. Schedule and fully coordinate work with Contracting

Officer and cognizant Security Officer. ]3.10 CLEANUP Remove waste fencing materials and other debris from the work site each workday.

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