Barbed Wire Hot dipped galvanized and galvanized wire fence for Perimeter fence System

 

HDG Barbed Wire is extensively used in perimeter fences construction.
In two ways:
1, Barbed wire rolls with posts;
2, Hot dipped galvanized barbed wire with hot dipped galvanized wire fences.

Barbed wire rolls alone used as perimeter or border fences are popular for farms and ranches to keep livestocks.

HDG Chain Link Fence and HDG Barbed Wire are mostly used for Construction of Perimeter Security Fence.
Perimeter fence is widely used for oil extraction wells and facilities Safety and Security, also used in various sensitive areas such as oil production, storage, and transporting facilities.
Installation of Barbed wire and Chain link fence are often used in oil field locations for perimeter safety fencing projects.
Mesh Fencing Fabrics and Barbed Wire supplied with Hot Dip Galvanized Coating for long time corrosion resistance.

The barbed wire + chain link security fencing systems normally include:

Supply of chain link fence, double leaf swing gate and emergency gate
Steel posts
Barbed wire
All accessories to install the chain link fence complete with civil works.

We provide fence construction and installation services:

Before erection, we help with:
i. Help inspect the location;
ii. Help with investigation and testing the soil and site to provide all necessary design parameters and topographic data for foundation design and site development;
iii. Following completion of new installation, all fence perimeter will be properly cleaned, grade, leveled and compacted (where necessary) according to the specifications and acceptance of COMPANY'S inspector.
iv. Help investigate the site, to ensure there are no unforeseen underground obstructions Which require avoidance when excavation for fence posts or other required excavations, to agree on removal of any above ground obstruction or to agree on minor deviation of the route of the fence.

Site Clearance
The site shall be cleared for fence construction. The site shall be cleared of existing structures, and utilities relocated or removed as described above.We help to make sure that normally applied precautionary measures are taken in the WORK site with the purpose of avoiding damages.

Earthworks
The necessary backfilling leveling and compaction shall be carried out along the route of the new fence prior to starting of the excavation. The route of the fence and the distance from the existing is specified and detailed drawings.
Necessary marking excavation and construction of foundations for security electrical barrier gate will be carried out.

STANDARDS AND CODES
Reference is made in this General Specification to the latest edition or revision of the following, which form a part of this Specification
BS 1772 Specification for chain link fence
BS 729 Hot dip galvanized coatings on iron and steel articles
BS 1775 Steel tubes for mechanical, structural and general engineering purposes
BS 4102 Steel wire for fences
BS 4360 Specification for weldable structural steels
BS 4848 Hot rolled structural steel sections
Part 2 Hollow Sections
Part 4 Equal and Unequal Angles

TECHNICAL DESCRIPTION OF FENCE
The overall fence layout and location together with the required of gates and hardware are provided with detail design.
The fence designed, supplied and constructed to conform in general to the BS 1772.
Fence Fabric: Galvanized steel fabric chain link fence, mounted on hot-dipped galvanized steel pipe to BS 729.
Chain link fence of 1800 mm high.
Post arms: All line post, intermediate post, corner post and gateposts include extension v arms for barbed wire.
Three strands of barbed wire carried on post extension
Four line wires to be tensioned by means of braced straining posts.

MATERIALS

All materials necessary to construct the perimeter fence and gates:

Galvanized Wire
i) Wire: all wire shall be galvanized steel and shall comply with BS 4102 Grade A.
ii) Chain Link Fencing: The chain link fencing with a mesh size of 50mm. The wire shall have a core diameter of 3.55mm, an outside diameter of 4.75mm, and shall comply with BS 4102. The top and bottom edges of fencing shall be knuckled finish.
iii) Line Wire: The line wires (four) shall have a core diameter minimum of 3.55mm, and outside diameter of minimum of 4.75 mm. The four line wires will be 600mm apart starting from the bottom of the chainlike fence.
iv) Tying Wire: The wire for securing the chain link fence to the line wire shall be galvanized steel with a core diameter of 1.4 mm and an outside diameter of 2mm. It shall be grade 'A' as specified in BS 4102.
v) Barbed Wire: Barbed wire conforms to the requirements of BS 4102.

B. Steel Posts and Struts
i) Posts and struts shall be of mild steel complying with the requirements of BS 4360 and shall be galvanized after manufacturer to meet requirements of BS 729. The top end of all hollow posts shall be capped and Sealed . The struts shall be bolted to the straining posts with suitable size no Corrosive clamps (stainless steel ) with bolt connections. The bottom of the Posts shall be coated (painted) with proper application up the height of 150mm above the concrete foundation.

C, Gate Posts
i) Gateposts shall be mild steel complying with the requirements of BS 4360 and shall be galvanized after manufacture to meet the requirements of BS 729. The top of the gate and barbet wire shall be leveled with tops of the chain link fencing and barbet wire respectively in the fence.
Gateposts shall have welded or bolted base plates so placed that they do not interfere with adjacent straining posts, alternatively the gate and straining post may be combined in one post. The top end of all hollow posts shall be capped and sealed. Base plates shall comply with BS 1722.

D. Fittings
i) All fittings for the fences shall be galvanized to meet the requirements of BS 729 including hairpin staples, cleats, eyebolt strainers, winders, stretcher bars and extension arms if these are bolted to the posts.
ii) All fittings, the gates and fencing are manufactured with compatibility of components.

E. Gates
i) Double gate normally locked is supplied and installed.
ii) Panic hardware escapes are supplied and installed.
iii) The gate construction is all welded and gates and fittings shall be galvanized after manufacture to the requirements of BS 729
The top of the gates is level with the top of chain link fence and barbed wire of the gates is level with the barbet wires of the fences.

The bottom of the gate shall have a ground clearance of not more than 50 mm.
Infilling of the gates consist of galvanized wire fabric of the same mesh and gauge as the fencing fabric. Infilling is fixed to the frames by galvanized Clam bars; the outside of the face shall be flush.
The hanging and shutting stiles shall be extended vertically upwards 300, to carry out 3 lines of barbed wire.

iv) Hinges, at the top and bottom, shall be of the heel and socket type.
The female half of the hinge is welded to the gate frame and the plate carrying the pin shall be bolted to the gateposts and inverted.
v) Drop bolts and slam plates: Mild steel drop bolts M20 diameter, shall be so fitted to all gate frames (and therefore to each leaf of a double gate) . Correspondingly sleeves to receive the bolts shall be set securely in the ground and concreted in.

The last closing leaf of a pair of gates shall incorporate a stop which prevents one drop bolt being lifted when the gates are closed.

Double gates which will normally be kept locked shall be provided all materials required including a slam plate of not less than 10 mm thick.

Locking devices shall be fitted to all gates. A locking bar not less than 40 mm x 10 mm flat shall be secured in a frame of 40 mm X 10 mm flat welded to the gate frame at the junction of the horizontal brace on the shutting stile. Using a padlock should operate the device.

F. Concrete Surrounding Bases of Posts and Struts
i) Concrete surrounding bases of posts and struts shall be according to the standards that have been used on site. A trail mix design shall be provided prior to commencement of concrete works. Concrete shall be a type Il sulphate resisting concrete mix, 30N at 28 days strength. Foundation shall be crowned above grade to shed water.

ERECTION OF THE GALVANIZED WIRE FENCE

Eerection of fencing, gates, stinging post, corner post, post footings and all other related works required to finish the fencing.

Line and Level
Erection of the fence includes such cutting and filling of the ground required to ensure a smooth vertical profile of the line of the top of the fence. The grading shall extend for a minimum of 3 m on either side of the fence line.
Where possible the line of the fence shall be set out in such a manner that changes of direction are formed as obtuse angles, no angle being less than 130°.

Posts Erecting
Straining posts shall be provided at all ends and corners of fences, at changes of direction or at acute variations in level, and at intervals not exceeding 60 m on straight lengths of fence.
All posts shall be pipe type.
Intermediate posts shall be spaced at regular intervals not exceeding 3 m.
After insertion of posts, the holes shall be filled in stages with concrete, well rammed as the filling proceeds, and consolidated. This process shall continue until the concrete is brought to a height of 50 mm above the surrounding ground level and finished with a sloping top to prevent accumulation of water and enable run off away from the post (or strut).

Struts Fitting
Struts shall be fitted to all straining posts in the direction of the line of the fence. The bottom end shall be not less than 0.6 m below the ground level. Holes of sufficient plan area and depth to accommodate strut and concrete surround shall be excavated.
After insertion of the struts, the holes shall be filled to their full depth with concrete, well rammed as the filling proceeds and consolidated. The minimum cover on all faces and at the ends of the struts shall be 75 mm.

Line Wires
Four rows of line wires evenly spaced (600 mm).
The bottom line wire is at the bottom and top wire shall be at top of chain link fabric. The bottom line wire shall be approximately 25 mm above ground level.
Each line wire is strained tightly by means of eyebolt strainers or winders at each straining post.
Each line wire is secured to each intermediate post by a wire stirrup passed through a hole in the post and secured to the line wire by three complete turns on each side of the post.
Alternatively the line wire may pass through a hole in the post.

Fixing chain link fencing
The chain link fencing is strained between each pair of straining post and secured to each straining post by means of a stretcher bar. The top Line wire shall be threaded through the appropriate adjacent rows of meshes, care being taken that the line wire except where deviation is necessary at the straining post bypasses on meshes in rows, the fencing shall be attached to the top and bottom line wires by wire ties spaced 150 mm apart, and to the middle line wires by wire ties spaced 450mm apart.

Barbed Wire Fixing
Three lines of barbed wire is supported on extension arms on each straining and intermediate post. Each line of barbed wire is strained to the posts on each straining post and gate post by means of eye bolt strainers or winding brackets. Barbed wire is secured to extension arms. Extension arms for barbed wire on gates are not be cranked, it is vertical.

Bolts
All bolts to fencing shall be burred over.

Steel Post and Strut Treatment
Where the post or strut enters a concrete footing the following treatment shall be applied:
• Paint with asphalt
• One wrap of felt
• Paint with asphalt
This treatment shall extend 25 mm above the top of the concrete and 125 mm into the concrete.

Renovation of Damaged Areas of Hot Dip Galvanized Coating
Small areas of hot dip galvanized coating damaged by welding, cutting or during transit and erection shall be renovated either by the use of low melting point zinc alloy repair rods or powders made specifically for the purpose or by the use of at least two coats of good quality zinc rich paint.
Sufficient material shall be applied to provide a zinc coating at least equal in thickness to the original layer.

GROUNDING

All fencing system including gates shall be adequately earthed by using galvanized or copper ground rods (1500 mm long) connected to gateposts (two rods for each gate).
Fencing shall be of an approved metallic type suitable for receiving bonding ground clamps.

We can provide the services of all necessary personnel and equipment for the fence installation:

• All earthworks associated with ground levelling, digging, and trenching related to the installation of Chain Link Fence.
• All equipment and personnel associated with the ground securing, including straining wires, clips, pegs, etc.
• All equipment and personnel associated with the installation of Chain Link Fence and Gates including civil works.
• Sufficient supervising personnel throughout the preparation, installation, and final inspection of the project.