BBR VT CONA CMM SINGLE
Monostrand post-tensioning system

The CONA CMM SINGLE post-tensioning kit is a monostrand system with one strand for internally unbonded or bonded applications. Both 0.62’’ (15.7 mm) strands with a cross-sectional area of 150 mm2 and 0.5’’ (12.9 mm) strands with 100 mm2 are commonly used, whereas the characteristic tensile strength for both strands is 1,860 MPa. For unbonded applications, use of a compacted 0.6’’ (15.2 mm) strand with a cross-sectional area of 165 mm2 and a tensile strength of 1,820 MPa is possible.

 

Anchorage configuration

Anchorage configuration

The main components in the anchor zone of the CONA CMM SINGLE system are the wedge, monolithic anchorage and an individual trumpet tube. In the anchorage zone, the strand is guided into the individual trumpet tube to the monolithic anchorage, where the strand is individually locked with a special BBR wedge. The anchoring of the strand and load transfer to the concrete is done with one and the same unit, allowing for a high economy, small centre and edge distances at the anchorage, 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 the strand protruding beyond the anchor head requires permanent corrosion protection and an adequate cap.

Fixed and stressable couplers

Fixed and stressable couplers

CONA CMM SINGLE tendons can be coupled using proprietaryType H sleeve coupler, whereas the coupler can serve as a stressing/active anchorage coupler (Type S) or fixed/passive anchorage coupler (Type F) during the first construction stage.

Available tendon sizes

Type of strands
in0506
mm293100140150165
MPa1,8601,8601,8601,8601,820
Tendon sizes
Strands Characteristic ultimate resistance of tendon [kN]
01173186260279300

Strand PT Systems - Strong and Versatile

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