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Stobie pole
From Wikipedia, the free encyclopedia
A Stobie pole is a power line pole made of two steel joists held apart by a slab of concrete in the middle. It was invented by Adelaide Electricity Supply Company design engineer James Cyril Stobie (1895–1953).[1] Stobie used materials easily at hand due to the shortage of timber caused by the arid and treeless nature of much of South Australia. In 1924 the pole was patented, Stobie describing his invention as
"an improved pole adopted to be used for very many purposes, but particularly for carrying electric cables, telegraph wires... [it] consists of two flanged beams of iron or steel, preferably rolled steel joist of 'H' or of channel sections, placed one beside the other with their flanges inward and preferably at a very slight angle one with the other and held together by means of tie bolts, the space between them being filled with cement concrete."[2]
Stobie and John Brookman were so confident of the new pole that they formed 'The Stobie Pole Syndicate' for the purpose of patenting the design and then selling the patent or manufacturing rights. The Hume Pipe Company became their first agents and, while there were numerous international enquiries, South Australia has remained, virtually, the only place where they are used.[3]
1937 imprintThe first poles were erected in South Terrace, Adelaide in 1924, and were then used extensively in building the electricity transmission and distribution infrastructure throughout the state. The Stobie pole was central to the speedy expansion of Adelaide Electricity Supply Company's supply. It was cheap and simple to produce, had a uniform appearance, saved an enormous amount of timber from being cut down, had a long life expectancy and, at the time, was seen as more environmentally sensitive.[4]
The poles carry voltages from 415 to 275,000 volts and come in various sizes from 9 to 35 metres in length.[citation needed] The expected service life of a Stobie pole is predicted to be in excess of 80 years. It is now commonly regarded as a South Australian icon.[5] ETSA Utilities manufactures Stobie poles at a plant in Angle Park, South Australia.
Its modern construction is a composite of two steel beams connected intermittently by bolts to manage compressive buckling, with the gap between the beams filled with concrete. The bolts transfer the shear, with an equal number of bolts above and below ground. The poles are tapered from ground level to the top and the toe. This construction uses the tensile properties of the steel, giving the poles excellent properties in bending. Small holes through the concrete enable easy attachment of modular cross-arms, insulators and other hardware. The poles are fireproof, rotproof, and termiteproof. They are also "car proof", causing enormous amounts of damage to vehicles when collided with.[6]
Attempts have been made to beautify their appearance through Stobie pole gardens[7] and Stobie pole art projects.[8][9] Renowned artist Clifton Pugh painted Adam and Eve in the Garden of Eden on a Stobie pole in 1984, but was subsequently asked to "cover up" the genitals on his painting.
Beginning stages of green building project. Doors and windows cut out of the insulated concrete form walls, IFC.
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