Steel Poles Line Support
Steel poles are used as an alternative to wooden poles. These poles have much more mechanical strength, durability and tensile strength than wood or concrete poles.
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These poles are usually used in long spans, from low pressure distribution lines to high pressure lines up to 11 kV. However, sometimes it is seen to use such pail in 33 KV line.
Types of steel poles
Steel poles are generally of three types.
(i) Rail poles
(ii) Tubular poles and
(iii) rolled steel joist pole
(i) Rail poles
The power of the rail pal is very high. But it also costs more to transport and pay for oil due to its high weight.
These poles are more commonly used in railways. 11 KV To 33 kV. Rail piles are used more in the line. Rail piles are usually 9 to 13 meters long. When steel piles are buried in the ground, bitumen is applied on the lower part and red oxide on the upper part.
These poles are usually built to a depth of 1.5 m and have an average lifespan of more than 40 years.
(ii) Tubular poles
Among these poles, there are two types of tubular poles, viz.
(1) Stepped pole
(2) Sweged pole
Both of these types of sails are made from unpaired steel tubes or welded steel sheets. In the case of stepped pail, a tube is made by pulling a die between different diameters.
When making a sized type pail, one end of the rod, tube or tube is heated and the edge of the six-diameter pipe is held very tightly with the help of a sewage device.
Tubular pails are usually 9 to 12 m long and come in different diameters. A cap is attached to the front of the pail and a welded base plate is attached to the bottom.
iii) rolled steel joist pole
Rolled steel joy pole is also known as I Beam. These beams are made from ordinary light steel. However, it can also be made of aluminum or other materials. These poles are brought to a certain size by hot rolling, cold rolling or extrusion.
