Prestressed Concrete

Fencing Posts

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Our prestressed concrete fencing posts are the product of over 40 years of experience, and have been used all over Southern Africa, being specified by consulting engineers for some of the highest level security installations in the sub-continent.

 

These posts are designed by a professional engineer, and manufactured in a production facility designed to ensure adherence to the specification and quality standards.

 

Cavcon pre-stressed fencing posts are an excellent choice for your wire mesh fence. Some notably important features are:

 

  • They have little intrinsic value, unlike timber or steel posts, and therefore are ideal for areas where there is high risk of theft.
  • In a field test they were shown to be very much stronger than 50mm x 2mm tubular steel posts.
  • They are extremely long lasting and manufactured for maximum corrosion resistance.
  • They are much more competitively priced than galvanized tubular steel posts.
  • They are aesthetically pleasing and have a beautiful finish.

 

You can have complete confidence in specifying and using fencing posts from Cavcon.

 

Features

 

Cavcon prestressed fencing posts are manufactured to comply in all respects with SABS specifications CKS 451 of 1976 and BS 2691.

 

Corrosion Resistance

Ability to withstand highly corrosive atmospheric conditions in coastal areas (salt penetration) and highly corrosive soil conditions in industrial areas (precipitation of acidic gas, effluent) achieved through:

 

Adequate concrete cover of prestressing wires (20 mm)

  • Densely vibrated concrete in individual moulds
  • Alkali-reaction-free concrete
  • Smooth surface on all faces with rounded corners

 

Bending Resitance

Bending moment values far in excess of requirements of CKS 451 of 1976 achieved through:

 

  • Concrete compressive strength of 50 MPa at 28 days
  • Unique stressing of wires using fixed anchorage
  • Good engineering design maximises strength to mass ratio

 

Quality and Durability

This prime Cavcon objective is achieved through:

 

  • Superiority in all essential technical characteristics
  • Unique patented production and design features
  • Strict adherence to product specifications and quality standards
  • Alkali-reaction-free concrete
  • 50 years experience in producing quality concrete products
  • Production facility designed by professional engineer
  • Backed by Cavcon lifetime guarantee

 

Availability

The following products are available ex-stock and delivered to site:

 

  • Fencing Posts: 1,80m, 2,10m, 2,40m, 2,70m, 3,00m, 3,60m (straining, stay and intermediate posts)
  • Overhangs: single and double (easily attached, bolted on)

 

Specifications

 

Concrete

The concrete shall consist of 13mm quartzitic stone, Swartkops River sand and Portland Cement, weigh-batched to produce a mix which has an average compressive strength of 50Mpa at 28 days for 150mm test cubes.

 

The mix shall be compacted by vibration in steel moulds, to produce dense concrete.

 

Prestressing Wire

Posts are to be prestressed with four crimped prestressing wires accurately positioned in the four corners of the moulds to give a concrete cover of 20 mm. Major posts shall be prestressed with four 5.0mm dia crimped prestressing wires, and intermediate and stay posts with 4.25mm dia crimped prestressing wire.

 

The prestressing wire shall comply with B.S. 2691 having a yield stress of approximately 1500MN and Young’s Modulus of approximately 200GPa.

 

The prestressing wires shall be equally tensioned in the moulds by a force producing an initial stress of not more than 70% of the 0,2% proof stress.

 

No prestressing wires shall be exposed when the posts are erected in concrete.

 

Fittings

The stay connectors and bolts shall be of hot dipped galvanised mild steel or as specified.

 

Spacing of Posts

Major post spacing shall be between 30m to 60m maximum on a straight run and fitted with 1 or 2 stay posts each. Major posts fitted with 2 stay posts shall be erected wherever there is a change of direction in the line of the fence.

 

Intermediate post spacing shall be 3m to 4m.

 

Standard footing sizes for posts are as below (see Dimensions). All footing sizes are dependent on ground conditions and mesh type.

 

Bending Moments

The major posts, intermediate posts and stay posts are to resist a minimum bending moment of 2.7kN.m, 1.3kN.m and 1.3kN.m respectively, in any position before initial failure occurs.

 

(Note: The force required to break a post, so that it does not fully recover, is considerably greater than the above specification.)

Dimensions

1.8m Posts

Type

Major

Stay

Intermediate

Code

MP180

SP180

IP180

Mass

57kg

31kg

31kg

Nominal Dimensions (mm)

1800 long, 115 x 115 cross section

1800 long, 80 x 80 cross section

1800 long, 80 x 80 cross section

Footing Size (mm)

450W x 450L x 600D

400W x 500L x 350D

350W x 350L x 600D

 

2.1m Posts

Type

Major

Stay

Intermediate

Code

MP210

SP210

IP210

Mass

65kg

37kg

37kg

Nominal Dimensions (mm)

2100 long, 115 x 115 cross section

2100 long, 115 x 115 cross section

2100 long, 80 x 80 cross section

Footing Size (mm)

450W x 450L x 600D

400W x 600L x 350D

400W x 400L x 550D

 

2.4m Posts

Type

Major

Stay

Intermediate

Code

M240

SP240

IP240

Mass

76kg

42kg

42kg

Nominal Dimensions (mm)

2400 long, 115 x 115 cross section

2400 long, 80 x 80 cross section

2400 long, 80 x 80 cross section

Footing Size (mm)

500W x 500L x 600D

400W x 600L x 350D

450W x 450L x 600D

 

2.7m Posts

Type

Major

Stay

Intermediate

Code

MP270

SP270

IP270

Mass

86kg

46kg

46kg

Nominal Dimensions (mm)

2700 long, 115 x 115 cross section

2700 long, 80 x 80 cross section

2700 long, 80 x 80 cross section

Footing Size (mm)

450W x 450L x 600D

400W x 600L x 350D

400W x 400L x 550D

 

3.0m Posts

Type

Major

Stay

Intermediate

Code

MP300

SP300

IP300

Mass

95Kg

51kg

51kg

Nominal Dimensions (mm)

3000 long, 115 x 115 cross section

3000 long, 80 x 80 cross section

3000 long, 80 x 80 cross section

Footing Size (mm)

500W x 500L x 600D

400W x 600L x 350D

450W x 450L x 600

 

3.6m Posts

Type

Major

Stay

Intermediate

Code

MP360

SP360

IP360

Mass

107Kg

88kg

88kg

Nominal Dimensions (mm)

3600 long, 115 x 115 cross section

3600 long, 80 x 80 cross section

3600 long, 80 x 80 tapered to 115 x 115

Footing Size (mm)

500W x 500L x 600D

400W x 600L x 350D

450W x 450L x 600D

See our products in action

Happy Customer

It is always a pleasure to get feed back from our customers!

 

We supplied our prestressed concrete fencing posts to Alcape Fencing ( http://www.alcapefencing.co.za/ ) for the boundary fence for the King David Mowbray Golf Course.   Both Alcape Fencing and the Golf Club are very satisfied.

Cavcon Fencing Posts – Test of Time

Cavcon prestressed fencing posts are highly durable and extremely long lasting.  This fence was erected mid 2007 and today (July 2016) it still looks in excellent condition.  The fence surrounds a motor factory on the outskirts of Motherwell, Port Elizabeth

Prestressed Concrete Fencing Posts

August 2008 to August 2009

Cavcon continues to manufacture and supply top quality prestressed fencing posts to all parts of the country. Some contracts include:

 

  • DWAF - Geelhout Canal
  • General Motors - Markman Plant
  • PWD - Rural roads in Eastern Cape
  • Vaal Marina - Water System
  • Various schools

Cavcon supplies the Department of Water Affairs and Forestry with 13 000 prestressed fencing posts. The fence is being erected to protect water canals. The Department is very happy with the quality and strength of the Cavcon posts.

The contracts with Department of Water Affairs are nearly completed. The second last load of prestressed posts are dispatched to the Bonniebrook Canal near Amsterdam in Mpumalanga.

 

From 2009 to 2015, Cavcon has supplied approximately 30 000 of their Prestressed Concrete Fencing Posts to various Department of Water Affairs (DWA) projects.

 

No posts are reported broken or faulty – a great testament to the superior quality of Cavcon’s products.

 

SALES EASTERN CAPE

+27 (0) 71 290 9703 (Cell)

+27 (0) 41 991 0622 (Tel)

+27 (0) 41 991 0636 (Fax)

sales@cavcon.co.za

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SALES WESTERN CAPE

+27 (0) 60 997 6199 (Cell)

salescpt@cavcon.co.za

 

 

CAVCON MANUFACTURING PLANT

8 Brickfields Road

Alexander Park Industrial

Uitenhage

Eastern Cape

South Africa, 6229

 

CAVCON POSTAL

P.O. Box 328

Uitenhage

Eastern Cape

South Africa, 6230

 

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