Rocla Strong Poles Provide a Reliable Infrastructure Solution
With South-East Queensland’s western corridor expected to experience substantial population growth in the next 25 years, the Energex project to upgrade an existing 110kV power line between Postman’s Ridge and Middle Ridge aimed to boost reliability and secure the future power supply.
A new 110kV circuit was added to the existing 2.7 kilometre overhead power line, running from Energex’s Postman’s Ridge substation and connecting to an existing 275kV circuit. As part of the project, the existing timber and concrete H-frame structures were replaced with Rocla spun concrete poles, which could support a double circuit on single concrete poles without stays.
By utilising the existing 110kV easement, Energex was also able to minimise impacts on the local community and environment. Rocla supplied poles ranging from 21.5 to 34 metres in length, with ultimate strengths from 80kN to 160kN. Poles longer than 24.5 metres were jointed, as were all of the Rocla® Strong Poles. Some poles located close to the road were painted green to reduce the visual impact.
About Rocla® Strong Poles
Rocla® Strong Poles were developed to service the high voltage transmission market and to provide an economical alternative for Rocla customers who previously sourced similar products from overseas.
The availability of the range has increased the support options and given authorities more flexibility when designing transmission lines. Their high strength and longer lengths (up to 56 metres) mean Rocla® Strong Poles have been used in areas where it was not previously possible to use standard Rocla® concrete poles.
The free-standing capability of the poles means no stay wires are required, a great advantage where land area and access are more constrained. Additionally, this eliminates the problem of stay failure. Various foundation options are also available, making the poles quick and easy to install. These include pad footings and direct embedment footing, as well as cast in situ piles or driven piles for soft ground conditions.
The Rocla® RSP range is available in either reinforced or pre-stressed concrete with common tip sizes to suit crossarms and other steelwork. Poles are supplied in sections that are bolted together on site using simple lug and stud connectors.