Taking into consideration the rapid development of the country and the rising demand of electricity and electrification and thereby the demand of the most economical and durable pre-stressed concrete poles in the expansion of the electrical power network, this industry was registered and established in 993 in the Department of Industry, Government of Nepal.
Traditionally wooden poles and steel tubular poles were used in the electrification network. Due to the decay and rusting behaviour and also the incurring high cost of the products, it has been replacing by the low cost of durable pre-stressed concrete poles.
The Pre Stressed Concrete Poles are manufactured in their respective mould made from MS Sheets of higher thickness. The mould of the poles to be casted are cleaned and well lubricated by using the mould releasing liquid. The reinforcing tendons are pre stressed with the help of the Electrical/Hydraulic Jack and the wires are locked at the end og the wires by using barrel and wedges.
The concrete of required mixed in the concrete mixture maintaining the specified cement content and water cement ration. The concrete mix is then casted in the mould with proper vibration by using form vibrators different locations of the mould for the uniform compaction throughout the pole. The compaction is done sufficiently so that it attains proper compaction and the remains no air voids inside the concrete.
The casted poles are either coverred with a layer of sacking, canvas, hessian or similar absorbent material and kept constantly wet, or it is cured inside the water curing tank and kept inside up to the time when the strength of the concrete is at least equal to the minimum strength of the concrete at the time of transfer of stress. After this the wires are cut at the end of the poles by Means of wire cutting scissors & the stresses are released/transferred to the concrete. The poles are then relased from the mould and immersed inside the watering-curing tank, until it attains its strength. After than the poles are taken out from the tank and kept stacked in the stacking yards, from where the poles are ready for dispatch to the buyers.
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I was really counfused at beginning about choosing the concrete blocks because I didn’t had any idea about it. But the Himalayan Pole team made me clear about the process and the benifits of it. Thanks to the team who were really helpful and I will surely love to work further with you, cheers!
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