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The systems are primary designed to suit for the post tension slabs and shallow depth structures such as in the transverse post tension of bridge deck slab and most of building slab. The systems are available for both unbonded and bonded tendon systems.

Single strand - unbonded tendon systems
The single strand system is normally adapted for unbonded tendon which the strand is greased and PE coated for corrosion protection as well as reducing friction.

Anchorage components

Stressing Anchorage Data

A normal reinforcing bar of 2 DB 12 Grade 40 is normally provided behind the stressing anchoring to act as brusting reinforcement in the anchorage zone.

Dead end anchorage

Multistrand flat duct - bonded tendon systems

The multistrand flat duct systems is normally adapted for bonded tendon. The strands are individually gripped in one flat anchor head unit and tramsmits their prestressing forces by mean of flat type anchor plate casting unit. The strands are stressed individually by mean of a mono strand jack. The strands are contained in one flat duct which is made of corrugated galvanized or non-galvanized metal. To ensure corrosion protection and to give adequate bond strength, the tendons are filled with suitable cement grout mix after complete stressing of the strands.

   

Anchorage Components

Stressing anchorage data

The Same anchorage for stressing anchorage can be used as dead end anchorage in which case the wedges are preseated in the anchor head unit by applying norminal force to the strand using the stressing jack.

Dead end anchorage

A bulb anchorage can be used as a dead end anchorage with simpler solution and more cost effective. In this case each strand is formed into a bulb shape by means of special bulb forming jack.

Anchorage dimensions, mm.

Multiple Stressing Systems

The systems are commonly used in bridge construction as well as other civil engineering structures such as silo., water tank etc. The systems normally adapted for bonded tendons. The tendon consists of a bundle of strand with a norminal diameter of 0.5” (12.7 mm.) or 0.6” (15.2 mm). The number of strands per tendon can be form 4 strands up to 31 strands of diameter 0.5” or 22 strands of diameter 0.6”. The strands in the tendons are contained in one round duct which is made of corrugated galvanized or non-galvanized metal.

Anchorage Components

The same anchorage can be used as dead end anchorage in which case the strands are gripped by means of wedge and are secured are secured by springs and covered with cap fastened against anchor plate casting to prevent intrusion of cement slurry into
the anchorage.

Multi strand anchorage type M with round duct

Anchorage dimensions, mm.

Spiral reinforcement for anchorage type M
for 25 N/mm2. concrete cylindrical strength at prestressing

   

Dimensions, mm.

Anchorage Coupling

   
 

Dead end anchorage

Bulb anchorage can be effectively used as dead end anchorage. In this case each strand is formed into a bulb shape by means of special bulb forming jack.

 

   

Spiral for buld dead end anchorage


for 25 N/mm.2 concrete cylindrical strength at prestressing

Tech9 Mono strand stressing jack

Multi Strand stressing jack

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