Used to press the fixed end of the prestressed steel strand into a pear-shaped scattered flower(Onion) shape, equipped with wedge, spiral ribs and other structural ribs, formed by the embossing part of the steel strand and the concrete by being wrapped, squeezed, and anchored to Self-anchor anchor head. This saves anchors at the fixed end.
The prestressing onion jack is mainly composed of hydraulic jack, jack head, frame, wedges that clamps the steel strand, and a set of loose clamp mechanism. The PC strand is stretched into the top pressure head clamp through the steel strand splint, and the PC strand is slightly clamped by the spring elastic force. When the hydraulic cylinder enters the oil, the piston moves, and the top pressure head bears the steel strand. Move the head together. At the same time, the clamp clamps the PC strand by the inclination, and as the piston moves, the clamp clamps the PC strand tightly by the inclination. When the piston moves in place, the PC strand between the clamping part of the clip and the top pressure head will be pressed into a pear-shaped scattered flower shape, and then the piston will return. When the piston return is about to end, the loosening mechanism will be pulled to drive the clamp to withdraw. The twisted wire can be taken out and the fixed end is completed.
ACI 318-19 (Chapter 20) – American Concrete Institute’s prestressed concrete provisions
ASTM A416/A416M – Standard specification for prestressing steel strands
BS 5896:2012 – British standard for high-tensile steel wire & strand
GB/T 5224-2014 – Chinese standard for prestressed steel strands
Post-Tensioning Institute (PTI) – Provides design manuals & field guides for post-tensioning
PCI (Precast/Prestressed Concrete Institute) – Industry-leading technical resources & certifications
Yes, our round wedge anchorages integrate seamlessly with HDPE/PVC ducts & cement grout injection.
Absolutely! We provide stainless steel (SS304/SS316) and epoxy-coated anchorages for saltwater exposure.
Yes, we provide customized services for all multi strands anchorage and PT slab anchor system.
Yes, we provide OEM services for prestressed anchorage.
Our MOQ is 50sets.
Estrella Polar Technology Co., Limited is a leading manufacturer and supplier specializing in prestressed construction equipment, backed by over 20 years of expertise in product design and manufacturing.
we are also a professional trading company with over a decade of international trade experience.
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