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Mono strand system
Flat tendon system
Multi strand system
External Prestessing


PBL Superforces Post tensioning Systems For Slab, Type SF.

Mono strand - unbonded tendon systems

The single strand system is normally adopted for unbonded tendon which the strand is greased and PE coated for corrosion protection as well as reducing friction.The strand is gripped in single strand anchorage type. To provide for a corrosion protection system the anchorage is encapsulated by a special plastic cap after the stressing and the strand end has been cut.

Stressing anchorage data

Strand Dia. 0.5 (12.7 mm.) 0.6 (15.2 mm.)
No. of strand 1 1
Type of anchorage SF105 SF106
Ultimate tensile force, KN 186 265
Stressing force at 0.8 U.T.S.,KN 149 212
Jack Type V16 V24

The same anchorage for stressing anchorage can be used as intermediate stressing anchorage and dead end anchorage. For dead end anchorage, the wedge is pre-seated in the anchorage by applying nominal force to the strand using the stressing Jack.

Alternatively a loop dead end anchorage can be used in which case the strand is formed in loop shape around the loop bearing plate and stressing anchorages are used at the stressing ends of the loop tendon.

A nominal reinforcing bar of 2 DB 12 grade 40 is normally provided behind the stressing anchorage to act as brustling reinforcement in the anchorage zone.

Dead end anchorage

Loop dead end anchorage for unbonded tendon

1. Loop dead end
2. Loop plate
3. Burstling reinforcement

Mono strand stressing jack

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Tel. 66(0)2562-0765-9, 66(0)2941-1692-3 Fax. 66(0)2562-0764 PBLGROUP@PBL-Thailand.com