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    1.3 Pre-tensioning Systems and Devices This section covers the following topics. ... The jacks are used to apply tension to the tendons. Hydraulic jacks are commonly used. ... Hydraulic jack at stretching end Initial gap End plate (c) Stretching of strands .

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    For tensioning, a hydraulic jack is used. Wires are gripped at the bulkheads, using split-cone wedges. These wedges are made from tapered conical pins. ... The cable is anchored at one end of the member and stretched using a hydraulic jack at the other end. After stretching the cable is anchored at the other end also. ... electric current of ...

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    • Tensioning Devices • Electric Prestressing • Chemical Prestressing • Basic Assumptions ... The wire tendons are mainly used in post tensioning system for prestressed concrete, they are cold drawn and stress is relieved with a yield stress of about 1300mpa and the diameter generally ranges from between 5mm-8mm. ... Hydraulic jacks are ...

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    The prefered and most accurate way to pre-stress an anchor is to use a hollow ram hydraulic jack which couples directly to the end of the anchor with a pull rod assembly. The jack frame typically bears against the steel plate while the hydraulic ram transfers a direct tension load to the anchor. ... Pre-stressed earth anchors are often used for ...

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    What is post tensioning in Civil Engineering? Update Cancel. ad by Aha! ... such initial compression in concrete is applied by tendon (cable) under tension (Prestressed concrete). ... the concrete members shifted to site and tendons were placed along the ducts and the cables will be pulled by hydraulic jacks. You can see HT strands in the above ...

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    Post-tensioning is a method of producing prestressed concrete, masonry and other structural elements. ... Tension is applied to prestressing steel by using a hydraulic stressing jack. The jack bears against one of the anchors that is ... The hydraulic jacks used to tension the post-tensioning

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    1.4 Post-tensioning Systems and Devices This section covers the following topics • Introduction ... Jack (b) Tensioning of tendons Anchor (c) Anchoring the tendon at the stretching end ... a hydraulic jack. This can be observed from the third photo.

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    Advantage of this method is that only two stretching mechanisms (two jacks - one at each end or one jack at one end and one anchoring device at the other end) ... Placing of jacks Applying tension to the tendons Jack Casting of concrete Cutting of the tendons. ... Documents Similar To Pretensioning Systems. Skip carousel. carousel previous ...

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    Pre-Tensioning and Post-Tensioning in Prestressed Concrete Design Pre-Tensioning in Prestressed Concrete Pre-tensioning is accomplished by stressing wires or strands, called tendons, to predetermined amount by stretching them between two anchorages prior to placing concrete as shown in …

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    Products > Prestressed Concrete Technology > Stressing on the Construction Site: International >> Order brochure . ... The stress is increased or reduced by stretching the whole stay cable and tightening or loosening the anchor nuts. Portable pump unit; Portable pump unit and multi-strand stressing jack for post-tensioning in mobile use.

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    Detensioning Unbonded Post-Tension Tendons. Posted on July 28, 2011 by Neel Khosa. ... the post-tensioning tendon will have to be “over-stressed.” The PTI Field Manual recommends that the hydraulic jack and pump gauge pressure should not be taken more than 5% over the normal stressing gauge pressure (at 33 kips of 0.5? tendon). ...

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