Description of single wire stressing jack:
Single-wire stressing jacks are manufactured with 220KN and 300KN capacity and 200mm or 400mm stroke. Sigle wire stressing jacks are sutable for 12.7mm,15.2mm , and 15,7mm strands. These jacks generally find their application in commercial buildings like malls, office space etc.
Parameters of single wire stressing jack:
Nominal oil pressure
Tension piston area
Return piston area
Piercing hole diameter
Return oil pressure
Less than or equal to 25
Safety precaution during operating single wire stressing jack:
During Prestressing operation, a huge forces are been induced into the tendons by the Jacking Equipments. These jacking equipments are working under tremendous hydraulic pressure, and thus a careful and competent workmanship can avoid accidents and damage to the equipment.
Some essential precautions are being listed here, to be adhered to:
Operating single wire stressing jack should be carried out by the trained and experienced personnel, under a competent engineer or supervisor.
The equipments, especially the high pressure hose pipes, and the end fittings should be in perfect conditions. Damaged hose pipes must be replaced immediately. Any lack of decision in this regard may cause a serious accident.
Protection caps must be placed over the Hose pipes nipples and the end fittings of the equipments. Always avoid putting the gausses or cotton waste into the nipple hole, as this may cause a severe ingress of dust & dirt into the hydraulic system.
Jacking equipments and power-packs shall never be lifted, using hose pipes as a lifting devise.
Stressing shall be done according to the specified data provided by the designer. In no case the pressure should be exceeded beyond 5% of the allowable limit.
During stressing, nobody should be allowed to stand behind or underneath the Jacking unit, since failure of a tendon can cause a sever injuries or even death.
In the stressing site; which are close to public traffic areas, A strong protective shield should be erected and the jack must be secured by ropes or chain pulley block to prevent failed strands from shooting out. SECTION – H THE FREYSSINET PRESTRESSED CONCRETE COMPANY LTD.
The Prestressing steel (i.e. bars, wires or strands) should be stored carefully to ensure that they are not damaged in any way and should be checked for rust or corrosion before use.
Care should be taken while handling and unwinding of prestressing steel coils, as they may ‘whip-back’ with force, if not securely bound.
All the technicians should wear hand gloves and other safety harnesses while working at overhanging/raised stressing platform. Technicians are prone to fall down from a height in such cases. Ensure that unauthorized people should not gather in and around Stressing Site as sight seeing location. Erect a safety warning sign around.
Wear safety helmets at site during stressing operation.
Do not permit welding operation near H.T. Prestressing steel. Molten sparks arises from welding, if falls on the tendons, will change its mechanical properties and promotes the possibilities of premature failure. The damages caused by inadvertent heating, from welding, may not be detectable by visual inspection.
Do not use Acetylene gas Torch heating apparatus to cut or trim the strand before stressing. Only abrasive cutting wheels should be used.
Prestressing steel should not be used for providing earthing to the electrically operated equipments. An electric spark, when jumps through the prestressing steel, may effect or alter the molecular structure and a loss of strength may occur.
Lightening conductors should be routed clear of tendons and the Anchorages etc. SECTION – H
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