Multistrand Post-tensioning
Live anchorages
Type CS 2000
This revolutionary anchorage has a composite bearing plate (metal - high performance concrete) and is lighter, smaller and easier to handle. It comes in three different configurations: CS 2000 - STANDARD for normal applications, CS 2000 - Plus using VSL' s PT-PLUSTM duct system for enhanced corrosion protection or improved fatigue resistance, and CS 2000 - SUPER able to provide an electrically isolated tendon. Equipped with an additional retainer plate, the CS 2000 anchorage can also be used as dead-end anchorage
Type GC
This is a compact and easy to handle anchorage system. If necessary, the spiral can be replaced by suitably laid out orthogonal reinforcements. Equipped with an additional retainer plate, the GC anchorage can also be used as a dead-end anchorage.
Type E
The prestressing force is transferred to the concrete by a bearing plate. If necessary, the spiral can be replaced by suitably laid out orthogonal reinforcements. Equipped with an additional retainer plate, the E anchorage can also be used as a dead-end anchorage
Type SC
This is a compact and easy to handle anchorage system. If necessary, the spiral can be replaced by suitably laid out orthogonal reinforcements. Equipped with an additional retainer plate, the SC anchorage can also be used as a dead-end anchorage.
Type Stronghold
This compact and easy to handle anchorage system allows prestressing force to be transferred through two flanges. If necessary, the spiral can be replaced by suitably laid out orthogonal reinforcements. Equipped with an additional retainer plate, the Stronghold anchorage can also be used as a dead-end anchorage.
Couplers and intermediate anchorages
Type K
This fixed coupler is used for connections to a cable that has already been installed and stressed. The strands are anchored using compression fittings positioned onto the coupling head grooves.
Type C
This fixed coupler is used for connections to a cable that has already been installed and stressed. The strands are anchored using compression fittings positioned onto the coupling head grooves.
Type Stronghold
This fixed coupler is used for connections to a cable that has already been installed and stressed. The strands are anchored using compression fittings positioned onto the coupling head.
Type V
This movable coupler is used for connecting to a cable that has already been installed but not stressed. The strands of the new cable are anchored using compression fittings positioned onto the coupling head of the previously installed cable.
Intermediate anchorage Type Z and ZU
Intermediate anchorages are used for those tendons where the ends cannot be fitted using normal stressing anchorages. The anchorage head is loosely placed in the blockout and moves during the stressing operation on the tendon axis.
Z type intermediate anchorages are used:
- For pressure shaft and pressure tunnel ring tendons, avoiding the use of internal buttresses;
- For silo and reservoir circular structure ring tendons, avoiding the use of external buttresses;
- For transversal bridge deck prestressing where, for aesthetic reasons, external anchorage blockouts are undesirable;
- For frame, arch and shell structure tension ties where there is no or limited access to end anchorages.
The VSL type ZU intermediate anchorage has similar application possibilities as type Z. It is particularly adapted to small cable units in structures without dynamic loading.
Dead-end anchorages
VSL Type P
This type of anchorage is used where the prestressing force has to be transferred to the structure at the far end of the tendon. It consists of a folded plate incorporating holes for the strands to pass through. The strands are anchored using compression fittings bearing onto the plate. The compression fittings are locked into position by a retainer plate. Where the force shall only be transferred to the concrete using a bearing plate, polyethylene tubes can be used to sheath the strands between the end of the duct and the bearing plate.
VSL Type H
This type of anchorage is the best solution when strands need to be pushed through on site. The prestressing force is transferred to the concrete by bond. The spiral (for 5-7 / 6-7 and larger units) and tension ring prevent in admissible stresses due to deviated forces acting on the concrete. The rebar net at the anchorage end zone acts as a spacer for individual strands.
VSL Type AF
This type of anchorage is used for vertical tendons installed once a structure is concreted, where the prestressing force has to be transferred to the structure at the lowest end of the tendon and when there is no access to the dead-end anchorage.
The strands are placed in the tendons with compression fittings at their lower ends, which are then bonded into the AF anchorage with a special cement grout. Once the grouted anchorage has achieved sufficient strength the tendon can be stressed from the live anchorage and then grouted.
VSL Type L
This type of anchorage is used for tendons installed once a structure is concreted and where there is no access to the dead-end anchorage. It is often used for vertical tendons in reservoir walls, for nailing pier head segments to piers in segmental bridge construction, or for horizontal tendons in slabs or foundation rafts. The strands are installed into the duct after concreting and simultaneously stressed using jacks at both stressing anchorage points.
VSL Type LD
When loops with a smaller radius are required, special half round ducts are available upon request. VSL type LD Loops are available with a 590 mm radius. The tendon sizes available are the same as type L, the difference is in duct configuration as indicated. A tight radius is good for nailing of precast box segments to piers.
Bonded slab post-tensioning
Live anchorages
VSL Type SO
VSL Type S
VSL Type Bondtech
Couplers
VSL Type SK
VSL Type S (Australia)
Bonded slab post-tensioning
Live anchorages
VSL Type SO
VSL Type S
VSL Type Bondtech
Couplers
VSL Type SK
VSL Type S (Australia)
Dead anchorages
VSL Type H
VSL Type P
VSL Type N
Monostrand slab post-tensioning
The VSL monostrand system has advantages similar to those of the VSL bonded slab post-tensioning system. The VSL monostrand system uses 13 mm (0.5'') or 15 mm (0.6'') diameter strands, which are given a coating of permanent corrosion-preventing grease and are enclosed in an extruded plastic sheathing. The grease and plastic provide double corrosion protection, as well as preventing any bonding between the strands and the surrounding concrete. The plastic sheathing is usually in polyethylene or polypropylene with approximately 1 mm wall thickness.
- 13 mm (0.5'') or 15 mm (0.6'') diameter strand in accordance with the concerned prestressing steel standards.
- External diameter of the plastic sheathing: approximately 16 mm and 18 mm respectively. Permanent corrosion-preventing grease and plastic sheathing in accordance with fib/PTI recommendations
The monostrands are installed either singly or in bundles of two, three or four. Each strand is individually anchored, stressed and locked-off. To ensure continuous corrosion protection, special sleeves are used to join the sheathings to the anchorages. The anchorages are provided with a protective cap.
Anchorages
Type S
Type SF
Type Bondtech
Couplers
Coupler type SK |
