Aveng Infraset concrete poles and masts are manufactured in ISO 9001-2008 accredited factories in Gauteng, KwaZulu-Natal and the Northern Cape. They are available in a wide range of strengths and sizes designed to fill most MV and LV line requirements, and comply with Eskom DTC 0106 and various SABS and Transnet specifications.
Our poles and masts are based on a unique design pioneered by Firth Stresscrete in New Zealand, a recognised authority on electricity reticulation poles. The units are ideally suited to applications such as power transmission, distribution, telecommunications and overhead electrical equipment (OHTE) for railways.
Their design is based on the optimal reinforcement of concrete, resulting in lightweight poles and masts with considerable transport and handling advantages.
Poles and masts - Ideal reticulation
The high strength-to-weight ratio of prestressed-concrete electrification poles and masts places them in a class of their own. Prestressed concrete poles and masts are functional yet relatively light, making them convenient for contractors to handle.
• Cast with tapered I-Section designs in aesthetically-pleasing light-grey concrete
• High-strength, high-density concrete has a smooth finish which is resistant to the elements.
• Experience worldwide demonstrates that during their lifetime, prestressed concrete poles are maintenance-free
• Concrete, unlike other materials, suffers no loss of strength over the years, being resistant to insects, fire, rot and corrosion
• Concrete poles and masts require no chemical treatment thus avoiding the risk of soil contamination
• Unlikely target of vandalism or theft as concrete poles have no resale or scrap value, nor can they be used to make fires or as building material.
Strength and availability
• Prestressed concrete poles and masts are resilient and will recover from the effects of a greater degree of overload than any other type of structural material
• The poles and masts have a crushing strength of 60 MPa after 28 days and are fully prestressed
• They are manufactured in a wide range of strengths and sizes to fill most requirements in MV and LV lines
• By choosing the appropriate pole or mast and foundation design, end-poles can be planted without stays, thereby saving space and eliminating clutter
• Prestressed concrete poles and masts are manufactured to guarantee maximum strength, which takes the guesswork out of line design.
• Can be cast with internal conduits for use in applications such as street lighting, security cameras etc.
• Supplied with standard holes
• All poles and masts are earthing ready
• Earthing bars with 12mm sockets at standard points can be cast into the poles on request
• Poles and masts can be stockpiled indefinitely in remote places without concern for theft, rot or corrosion.
Poles and masts are designed to different ultimate loads, depending on the strength class required. External loads i.e. winds, line tension, conductor type and installation conditions determine a pole’s working load. A factor of safety is then added to the working load to determine the ultimate (design) load.
Testing takes place on a test bed where the design tip load is applied, simulating working conditions. Working loads should never exceed design loads.
Pole and mast design is based on the OHS Act, which stipulates minimum requirements. If it is suspected that a load may exceed the requirement, the structure/span lengths needs to be redesigned. Broken conductors are not taken into account in the design.
All poles and masts are designed for a maximum wind load of 700Pa. When facing downline a pole can only draw 25% of its transverse strength. This downline loading has been found to be sufficient to resist minor accidental loads incurred during handling and installation.