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Send  Share  RSS  Twitter  20 Aug 2009

Business: Providing the Power to Move Bridges

 





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“Bridges are being lifted in both Johannesburg and Cape Town to bring them into compliance with newly implemented legislated heights. By lifting the bridges an economically viable alternative is achieved to demolishing and rebuilding them. Highways in and around major metropolitan areas are the lifeblood of commerce. So closing a highway, for any period of time, is a less than favourable option. Rebuilding a bridge also costs in the region of seven million rand, so a safe, cost-effective alternative is always preferable,” says Ian Bennett, General Manager, Power Team SA (Pty) Ltd.

A total of twenty seven double acting jacks, each with a lifting capacity of 187 ton giving a combined lifting capacity of 5049 tons have been supplied. The jacks are in turn powered by three high pressure power packs. Each power pack has nine outlets, individually controlled using adjustable shut off valves.

“The process of lifting a bridge requires a high degree of precision to accomplish successfully. The bridge is first lifted using hydraulics then steel and concrete spacers are inserted. This process is repeated until the required height is attained,” says Bennett.

As a result of the environment that the jacks are exposed to in the general construction industry, the Power Team jacks have heat treated hard chrome plated piston rods to reduce wear due to abrasion. In addition the jacks are supplied standard with a swivel load cap to reduce the effects of off centre loading as well as a built in relief valve on the retract side to prevent over-pressurisation of the retract circuit ensuring that the hydraulic jacks provide a long and reliable service life.

“The supply of high tonnage jacks for a project in which the safety stakes are so high demonstrates the faith that the market places in Power Team products to provide effective solutions which can be used under the most demanding conditions,” concludes Bennett.


 
 
 
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