Chain Link Fencing and Gate

SECTION 7.13 7.13.1 A.

KHBT DEVELOPMENT ZONE AT MAFRAQ EARLY INTERVENTION PHASE INFRASTRUCTURE WORKS

CHAIN LINK FENCING AND ASSOCIATED GATES

GENERAL

Scope: this Section includes galvanized fences and associated gates.

7.13.2

DEFINITIONS

A.

Industrial chain-link fences: fences up to 2.15 m in height as per BS 1722-1.

B.

Anti-Intruder chain-link fences: fences minimum 2.40 m in height with additional 0.48 m (vertical) for barbed wire extension as per BS 1722-10.

7.13.3 A.

SUBMITTALS Shop Drawings: submit shop drawings showing fences and associated gates and installations, including but not necessarily limited to the following: elevations and locations of fences and gates; details of fence panel and gates installation, hardware and accessories the profile of the fence showing ground clearances hardware, and accessories plans, elevations, sections, gate swing and other required installation and operational clearances, and details of post anchorage and attachment and bracing.

B.

Product Data: provide material descriptions, construction details, dimensions of individual components and profiles, representative samples from the same materials to be used for the Work, and finishes for the following: fence and gate posts, rails, and fittings chain-link fabric, reinforcements, and attachments gates and hardware barbed wire


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barbed tape


gate operators, including operating instructions C.

Control Samples: in approved locations complete sample areas of not less than 10 m2 of each type of fencing as part of the permanent work. Obtain approval of appearance before proceeding.

D.

Installer Certificates: signed certificates by product manufacturer certifying that Installer is approved, authorized, or licensed by manufacturer to install his products.

E.

Installer Experience: list of five projects (minimum) of a similar nature carried out successfully by the installer with the same product endorsed by the manufacturer’s representative.

7.13.4

QUALITY ASSURANCE

A.

Installer Qualifications: a qualified firm specializing in performing the work of this Section with minimum three years documented experience and that is approved, authorized, or licensed by the product manufacturer to install his product and that is eligible to receive manufacturer' s warranty. Include project names and addresses, names and addresses of Engineers and Owners, and other relevant information

B.

Source Limitations: obtain each colour, grade, finish, type, and variety of component for fences and gates from one source with resources to provide fences and gates of consistent quality in appearance and physical properties.

C.

Standards: BS 1722-1. Specification for chain link fences BS 1722-10. Specification for anti-intruder fences in chain link and welded mesh

7.13.5 A.

PROJECT CONDITIONS

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


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7.13.6 A.

MATERIALS AND PRODUCTS


Posts and Struts

A.1 Industrial Fence Framing: hot finished structural circular (CHS) hollow sections to BS EN 10210-1 and BS EN 10210-2. Refer to table 4 of BS 1722-1 for sizes of posts and struts. Fence Height: more than 1.80 m high and not exceeding 2.15 m high as per table 2 of BS 1722-1, or as indicated on Drawings. A.2 Anti-Intruder Fence Framing: hot finished structural circular (CHS) hollow sections to BS EN 10210-1 and BS EN 10210-2. Refer to table 2 of BS 1722-10 for sizes of posts and struts. Fence Height: more than 2.40 m high with additional 0.48 m (vertical) for barbed wire extension, or as indicated on Drawings. A.3 Steel Gate Posts: cold formed welded circular hollow section to BS EN 10210-2 made from steel to BS 4360 grade 43 C, or ASTM F1043 Group IC. Minimum yield strength to be not less than 344 MPa (50,000 psi) Gate leaf width

Circular Section

Square Section

up to 2.00 m

114.3 × 5 mm

100 × 100 × 4 mm

2.00 - 4.00 m

139.7 × 5 mm

100 × 100 × 4 mm

4.00 - 6.00 m

168.3 × 5 mm

150 ×150 × 5 mm

6.00 - 10.00 m

219 × 6.3 mm

180 × 180 × 6.3 mm

A.4 S teel Struts: cold formed welded circular hollow section to BS EN 10210-2 made from steel to BS EN 10137 -1>3 [BS 4360 grade 43 C], or ASTM F669 Group IC. Minimum yield strength to be not less than 344 MPa (50,000 psi) Circular Section

Square Section

48.3 × 3.2 mm

40 x 40 x 3.2 mm


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B.


Rails

B.1 Top Rails: cold formed welded circular hollow section to BS EN 10210-1 and BS EN 10210-2 made from steel to BS 4360 grade 43 C, or ASTM F669 Group IC. Minimum yield strength to be not less than 344 MPa (50,000 psi)

C.

Circular Section

Square Section

42.2 × 3.2 mm

40 × 40 × 3.2 mm

Gates

C.1 Gate Frame: cold formed welded circular hollow section to BS EN 10210-1 and BS EN 10210-2. Refer to table 3 of BS 1722-10 for anti-intruder fencing, for sizes of gateposts and struts. Provide braces and truss rods when necessary to prevent sagging. Gate leaves wider than 1.75 m are to be provided with rollers. C.

Sundries

C.1 Stretcher Bars: 25 x 5 mm hot rolled flat bars to BS 1449- 1.1. C.2 Cranked Tops: to posts shall be at an angle of 45 deg. to the vertical and are to be 707 mm long on the oblique. C.3 Barbed Wire Extension: integral extension of intermediate, straining, end and gate posts extended vertically. C.4 Barbed Wire Extension: integral extension of gate frame extended vertically. C.5 Barbed Wire Extension: hot rolled mild steel equal angle 50 x 50 x 6 mm to BS EN 10056-1 made from steel to BS 4360 grade 43 C and of sufficient strength to carry a weight of 115 kg applied at the outer strand of barbed wire. Extension arms are to be as shown on drawings and to have the same finish as posts. Arms are to be of such a length as will increase fence height by 500 mm. C.6 Barbed Wire Extension: concrete extension arms are to be cast with the posts. Cranked tops for intermediate posts shall taper to 100 mm x 85 mm at the top and shall be provided with 10 mm diameter holes for stirrup wires for securing three lines of barbed wire 200 mm apart. Cranked tops for straining posts shall taper to 150 mm


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x 85 mm at the top and shall be provided with 12 mm diameter holes for straining eye bolts for securing three lines of barbed wire 200 mm apart. D.

Wire and Mesh

D.1 Barbed Wire: mild steel galvanised wire to the requirements of BS EN 10223-1. D.2 Line Wire: mild steel galvanised wire to the requirements of BS 4102 and BS 172210 for anti-intruder fencing. D.3 Typing Wire: mild steel galvanised wire 1.4 mm core diameter and 2 mm outside diameter to the requirements of BS 4102. D.4 Stirrup Wire: mild steel galvanised wire 2.50 mm core diameter and 3.55 mm outside diameter to the requirements of BS 4102. D.5 Chain Link Fabric: galvanised mild steel wire conforming to 5.2a and table 2 of BS EN 10223-6, helically wound and interwoven in such a manner as to provide a continuous mesh without knots or ties except in the form of knuckling or twisting the ends of the wire to form the selvage at both ends of the fabric. The woven wires will form a mesh with a diamond-shaped openings. E.

Coatings

E.1 Galvanized Sub-Base: on steel wires and fabrics to BS EN 10244-2. The weight of the zinc coating to be 244 g/m2. F.

Components and Accessories

F.1 Winding Brackets: bands made from mild steel flat 40 x 2.5 mm and fitted with a winding bolt and double nuts of M16 minimum diameter and with a ferrule or ratchet winder. Winding brackets for double line wires to be suitably modified. F.2 Ties or Clips of adequate strength are to be provided in sufficient number for attaching the fabric to all line posts at intervals not exceeding 380 mm; and not exceeding 600 mm when attaching fabric to top rail or tension wire.


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F.3 Posts Caps: to consist of plain, ornamental or combination caps with barbed wire supporting arms as shown on drawings. When top rails are specified, the post cap is to be provided with a hole suitable for the through passage of the top rail. Post caps are to fit over the outside of posts and are to exclude moisture from posts. F.4 Fittings and accessories are to be galvanised steel, primed and coated with matching powder coating. Painted fittings are not acceptable. F.5 Bolts: nuts and washers are to be austenitic stainless steel. 7.13.7 A.

WORKMANSHIP Generally

A.1 Quality of Work: work in this section is to be executed in accordance with BS 1722 1, 10 and 13. A.2 Quality of Work: set out and erect fencing accurately, with posts: in straight lines or smoothly flowing curves as shown on drawings set with tops following profile of the ground set secure, plumb and to specified depth, or greater where necessary to ensure adequate support on completion, check fencing and ensure that posts are rigid and fastenings secure. A.3 Fence Route: clear vegetation or other obstructions along fence routes. Remove any humps and fill any hollows with compacted soil to provide a clear way, permitting unobstructed passage on both sides of the fence, approximately level or with smooth undulations. B.

Posts and Struts

B.1

Steel Posts set in concrete are to have spragged ends.

B.2 Straining Posts: provide at spacing specified in BS 1722-10 in straight runs and at all ends, corners, changes of direction and acute variations in level.


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B.3 Straining Posts: provide at all ends, corners, changes of direction and acute variations in level. B.4 Straining Posts: set posts in holes 500 x 500 mm or 300 diameter x 750 mm deep. Fill the depth with Class B concrete. B.5 Intermediate Posts: set posts in holes 300 × 300 mm or 300 diameter × 750 mm deep. Fill the depth with Class B concrete.

B.6 Struts: provide struts to all straining posts in direction of the line of the fence. Struts are to be uniformly angled to give maximum support. B.7 Struts: set struts in holes 300 × 450 mm × 500 mm deep. Fill the depth with Class B concrete. B.8 Setting Posts in concrete: excavate holes neatly and with vertical sides. Position post/strut and fill hole with Class B concrete to the specified depth, well rammed as filling proceeds and consolidated. B.9 Exposed Concrete Foundations not subsequently covered by paving to be compacted until air bubbles cease to appear on the upper surface, then weathered to shed water and trowelled smooth. C.

Line Wires

C.1 Provide four line wires, evenly spaced, for anti- intruder fencing, the top wire to be doubled. C.2 Bottom Wire: secure reasonably close to ground level. C.3 Strain line wires tightly to each steel straining posts with winders. C.4 Secure line wires to steel intermediate posts by a wire stirrup passing through a hole in the post and secured to the line wire by three complete turns on each side of the post.


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D.

Fixing Chain Link Fabric


D.1 Strain chain link fabric between each pair of straining posts and secure at each straining post with a stretcher bar. D.2 Secure stretcher bar to straining post at brackets or bands securing line winders. D.3 Fix chain link fabric to top line wires with tie wires spaced at 150 mm. D.4 Fix chain link fabric to top rail with tie wires spaced at 350 mm. D.5 Fix chain link fabric to intermediate and bottom line wires with tie wires spaced at 150 mm on bottom line wire and 450 mm on the remaining line wires for general purpose and anti-intruder fences. D.6 Concrete Sill: cast a continuous concrete sill, spanning the full distance between posts, 125 mm wide x 225 mm high with its top at ground level approximately 25 mm below the bottom of chain link fabric. Fix fabric to the concrete sill with hair pin staples set 150 mm deep into the sill. E.

Gates

E.1 Gates: are to be constructed of powder coated sections joined at the corners with specially designed corner fittings. Braces and truss rods are to be provided as necessary to prevent sagging. E.2 Gate Fabric is to be the same type used in the fence construction. The fabric is to be attached securely to the gate frame at intervals not exceeding 380 mm. E.5 Gate Hinges are to be of adequate strength for gate, and with large bearing surfaces for clamping in position. The hinges are not to twist or turn under the action of the gate. The gates are to be capable of being opened and closed easily by one person. E.6 Gate Latches, Stops and Keepers are to be provided for all gates. Latches are to have a plunger-bar arranged to engage the center stop, except that for single gates of openings less than 3.00 m wide a forked latch may be provided. Latches are to be arranged for locking. Center stops are to consist of a device arranged to be set in concrete and to engage a plunger bar of the latch of double gates. No stop is required


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for single gates. Keepers are to consist of a mechanical device for securing the free end of the gate when in the full open position. F.

Barbed Wire and Extension Arms

F.1 Steel Extension Arms: bolt to steel or concrete posts. F.2 Barbed Wire: provide 3 lines of barbed wires. Strain each line with strainers attached to straining posts or to extension arms. Secure each line to each intermediate post or to extension arms.


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Chain Link Fencing and Gate

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