HM-type annular anchorage

HM-type annular anchorages are also known intermediate anchorages or free anchorages. They are tensioned with an angulating device in one direction, and the deflection angle is variable by superimposing different numbers of angulating blocks according to the actual working conditions. They are mainly used for prestressed concrete lining structures of diversion tunnels and sand desilting tunnels in hydropower stations, and annular prestressed structures such as large sewage pool and coal bunker, and can also be used as the coupler for prestressing tendons.

Structural diagram: