BBR VT CONA CME
External post-tensioning system
The CONA CME post-tensioning kit is the ultimate multi-strand system for all types of externally post-tensioned applications. The standard tendon sizes range from 1 to 61 seven-wire prestressing strands. Larger sizes are also possible and CONA CME tendons with 73 strands have already been used. 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 are used.
Anchorage configuration

Anchorage configuration
The main components in the anchor zone of the CONA CME system are the wedges, anchor head, load transfer element and trumpet. In the anchorage zone, the duct is connected to the trumpet and 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 CME BT (bearing trumplate) can be used for tendon sizes from 2 to 61 strands and the CONA CME SP (square plate) can be used for 1 to 73 strands. The CONA CME BT bearing trumplate system makes use of an advanced and proprietary three plane load transfer, allowing for very small centre and edge distances at the anchorages, as well as application of the full post-tensioning load at very low concrete strengths. The CONA CME SP square plate is a more traditional system with a single plane load transfer to the concrete.
CONA CME anchorages are Type S stressing/active anchorages and Type F fixed/passive anchorages. The anchor heads of the stressing and fixed anchorages are identical. For construction works, the wedges of inaccessible fixed anchorages are secured by special wedge retaining measures and are protected by a cap during concreting. 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 re-stressing or releasing and the strand protruding beyond the anchor head requires permanent corrosion protection and an adequate cap.
Fixed and stressable couplers
Fixed and stressable couplers
Although less common for external tendons, CONA CME tendons can be coupled using proprietary Type K overlap coupler for tendons ranging from 2 to 31 strands (larger sizes on request) or Type H sleeve coupler for 1 to 73 strands.
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 strand bundle is enclosed in a smooth round plastic or steel duct. The filling of the tendons is carried out using a high performance BBR grout or grease/wax. The use of greased/waxed and HDPE sheathed monostrand is a further possibility.
Available tendon sizes
| Type of strands | ||
| in | 06 | |
| mm2 | 140 | 150 |
| MPa | 1,860 | 1,860 |
| Tendon sizes | ||
| Strands | Characteristic ultimate resistance of tendon [kN] | |
| 01 | 260 | 279 |
| 02 | 521 | 558 |
| 03 | 781 | 837 |
| 04 | 1,042 | 1,116 |
| 05 | 1,302 | 1,395 |
| 06 | 1,562 | 1,674 |
| 07 | 1,823 | 1,953 |
| 08 | 2,083 | 2,232 |
| 09 | 2,344 | 2,511 |
| 12 | 3,125 | 3,348 |
| 13 | 3,385 | 3,627 |
| 15 | 3,906 | 4,185 |
| 16 | 4,166 | 4,464 |
| 19 | 4,948 | 5,301 |
| 22 | 5,729 | 6,138 |
| 24 | 6,250 | 6,696 |
| 25 | 6,510 | 6,975 |
| 27 | 7,031 | 7,533 |
| 31 | 8,072 | 8,649 |
| 37 | 9,635 | 10,323 |
| 42 | 10,937 | 11,718 |
| 43 | 11,197 | 11,997 |
| 48 | 12,499 | 13,392 |
| 55 | 14,322 | 15,345 |
| 61 | 15,884 | 17,019 |
| 69 | 17,968 | 19,251 |
| 73 | 19,009 | 20,367 |
Strand PT Systems - Strong and Versatile
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