En­er­pac’s no-tears way to peel away prob­lems of onion jack stress­ing

DEMM Engineering & Manufacturing - - PRODUCT WATCH -

One of the chal­lenges to the pop­u­lar method of us­ing an onion jack to stress steel strand ca­bles in con­crete struc­tures is en­sur­ing safe re­li­able hy­draulic power where mains elec­tric­ity is not al­ways avail­able.

En­er­pac XC cord­less pumps pro­vide a clean, quiet go-any­where source of power for the onion-jack method, which in­volves ap­ply­ing hy­draulic force to the clamped end of the braided steel stress­ing strands, which forms into an onion shape that can then be fixed and con­creted into place within the con­crete struc­ture to form an an­chor­ing point to stress from.

Th­ese pow­er­ful 700 bar (10,000psi) cord­less hy­draulic pumps of­fer the per­for­mance ca­pa­bil­i­ties of an elec­tric or pneu­matic pow­ered pump with the con­ve­nient porta­bil­ity of a hand pump, says En­er­pac Aus­tralia and New Zealand Na­tional Sales Man­ager Mr Dar­ryl Lange. De­signed to sat­isfy the need for a long-last­ing pump that can be used in hard-to-ac­cess and re­mote ar­eas, XCSeries cord­less pumps are con­structed of light­weight ma­te­ri­als, equipped with a pow­er­ful, one-half horse­power mo­tor and fea­ture 28-volt, Lithium-Ion bat­tery tech­nol­ogy to de­liver the speed, power and longevity of a corded pump.

“In ad­di­tion to pow­er­ing onion jacks, th­ese ver­sa­tile pumps can also be used in and around in­ac­ces­si­ble and re­mote sites to power a host of tools widely used in con­struc­tion, in­fras­truc­ture, build­ing, min­ing, en­ergy, in­dus­trial plant and ve­hi­cle main­te­nance tasks. The light­weight XC pump comes com­plete with a carry strap for in­creased mo­bil­ity on site,” said Mr Lange.

The onion jack process is com­mon to multi-story or slab con­struc­tion where ac­cess is in­hib­ited by beams or other ob­struc­tions. In such cases, work­site per­son­nel can­not use stress­ing ca­bles’ stan­dard live end and dead ends.

The En­er­pac onion jack­ing method can also be used where a strand blow-out has oc­curred and needs re­work to the strand, says Mr Lange.

With its blad­der reser­voir, En­er­pac’s cord­less pumps elim­i­nate vent­ing and of­fer leak-free op­er­a­tion in any ori­en­ta­tion. Plus, the over­all body, han­dle and trig­ger have been er­gonom­i­cally en­gi­neered to max­imise ease-of-use and porta­bil­ity. XC-Se­ries cord­less pumps de­liver oil flow of two litres per minute at its low-pres­sure set­ting and .25 litres per minute when op­er­at­ing at full pres­sure, up to 700bar (10,000 psi). Ad­di­tion­ally, the lithium-ion tech­nol­ogy en­sures XC-Se­ries pumps pro­vide end users with the bat­tery run­time nec­es­sary to ac­com­mo­date de­mand­ing ap­pli­ca­tion re­quire­ments. En­er­pac’s XC-Se­ries pro­motes op­er­a­tor safety by re­mov­ing trip haz­ards as­so­ci­ated with tra­di­tional pow­ered pumps, and a trig­ger lock-off mech­a­nism that pro­tects against un­in­tended op­er­a­tion dur­ing trans­port. “With our in-depth un­der­stand­ing of industry de­mands and the chal­lenges plagu­ing portable pump tech­nol­ogy, we de­signed the XC-Se­ries to be a durable so­lu­tion ver­sa­tile enough to sat­isfy our cus­tomers’ per­for­mance re­quire­ments,” said Mr Lange. “The XC-Se­ries fea­tures a two-litre reser­voir model, mak­ing this cord­less pump the ideal so­lu­tion for op­er­at­ing small to medium tools and cylin­ders.” The XC se­ries portable pump com­ple­ments the broader En­er­pac range of pump­ing tech­nolo­gies used and backed with com­pre­hen­sive ser­vice through­out Aus­trala­sia, rang­ing from hand types to pow­er­ful, en­ergy-sav­ing elec­tric and fast-act­ing pneu­matic types. The ranges in­clude rugged work­horses such as the ZU448REA300 dou­ble-act­ing pump can be cou­pled with com­pact and pow­er­ful En­er­pac post-ten­sion­ing tools for mono strand con­struc­tion ap­pli­ca­tions com­mon on build­ing and in­fras­truc­ture de­vel­op­ment sites. En­er­pac fea­tures a ver­sa­tile line of con­crete pre-stress­ing and post-ten­sion­ing prod­ucts, along with an ex­ten­sive range of as­so­ci­ated hy­draulic pumps and ac­ces­sories, all from a sin­gle source.

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