BBR VT CONA CMB
Band post-tensioning system
The CONA CMB post-tensioning kit is a multi-strand system for special external and also internal unbonded post-tensioned applications. The standard tendons range from 1 to 16 seven-wire prestressing strands. Most commonly 0.62’’ (15.7 mm) strands with a cross-sectional area of 150 mm2 and a characteristic tensile strength of 1,860 MPa and a compacted 0.6’’ (15.2 mm) strands with a cross-sectional area of 165 mm2 and a characteristic tensile strength of 1,820 MPa are used.
Anchorage configuration
Anchorage configuration
The main components in the anchor zone of the CONA CMB SP system are the wedges, anchor head, load transfer element and trumpet.
In the anchorage zone the strand bundle is spread out towards the anchor head, where each strand is individually locked with special BBR wedges. For the load transfer to the concrete, the CONA CMB SP (square plate) is used.
CONA CMB anchorages are the Type S stressing/active anchorages and the Type F fixed/passive anchorages. The anchor heads of the stressing and fixed anchorages are identical. For restressable and exchangeable tendons, excess strand length is required at the anchorage. The extent of the excess strand length depends on the jack used for restressing or releasing and strand protruding beyond the anchor head requires permanent corrosion protection and an adequate cap.
Deviator/saddle
Deviator/saddle
An element that is specific to external prestressing is the deviator/saddle. The deviator transfers the transversal forces generated by the tendon to the structure and provides a smooth surface for the tendons. The deviator can be made of concrete, steel, HDPE or equivalent.
Corrosion protection
Corrosion protection
The strands are greased/waxed and individually sheathed in the factory with a continuously extruded HDPE sheathing and subsequently grouped parallel and then contained within an additional extruded smooth rectangular plastic sheath.
Available tendon sizes
| Type of strands | |||
| in | 06 | ||
| mm2 | 140 | 150 | 165 |
| MPa | 1,860 | 1,860 | 1,860 |
| Tendon sizes | |||
| Strands | Characteristic ultimate resistance of tendon [kN] | ||
| 01 | 260 | 279 | 300 |
| 02 | 521 | 558 | 601 |
| 04 | 1,042 | 1,116 | 1,201 |
| 06 | 1,562 | 1,674 | 1,802 |
| 08 | 2,083 | 2,232 | 2,402 |
| 12 | 3,125 | 3,348 | 3,604 |
| 16 | 4,166 | 4,464 | 4,805 |
Strand PT Systems - Strong and Versatile
Go to the Download page
European Technical Approvals in different languages
Go to the Download page