BBR VT CONA CMM TWO/FOUR
Monostrand post-tensioning system
The CONA CMM TWO and FOUR post-tensioning kit is a monostrand system for internally unbonded applications. The standard tendons have 2 or 4 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 special 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 CMM system are the wedges, monolithic anchorage and individual trumpet tubes. In the anchorage zone, the strands are guided into the individual trumpet tubes to the monolithic anchorage, where each strand is individually locked with special BBR wedges. The anchoring of the strand and load transfer to the concrete is carried out with one and the same unit, allowing for a high economy, small centre and edge distances at the anchorages, as well as application of the full post-tensioning load at very low concrete strengths.
CONA CMM anchorages are stressing/active anchorage (Type S) and the fixed/passive anchorage (Type F). Both types 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 restressing or releasing and strand protruding beyond the anchor head requires permanent corrosion protection and an adequate cap.
Fixed and stressable couplers

Fixed and stressable couplers
CONA CMM FOUR tendons can be coupled using propriety Type H sleeve coupler, whereas the couplers can serve as a stressing/active anchorage coupler (Type S) or fixed/passive anchorage coupler (Type F) during the first construction stage.
Corrosion protection
Corrosion protection
For CONA CMM TWO and FOUR applications, the monostrand are greased/waxed and individually sheathed in the factory with a continuously extruded HDPE sheathing.
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] | ||
| 02 | 521 | 558 | 601 |
| 04 | 1,042 | 1,116 | 1,201 |
Strand PT Systems - Strong and Versatile
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