In order to ensure the unbonded prestressed concrete structure after transforming the stress performance, we must decrease the loss of prestress as much as possible. Two types of simple and high effective opening anchorages have been developed by combining rebuilding of a tall building. Working anchorage and tool anchorage are prepared. Demolish in the tensioning state of unbonded prestressed steel strand with special opening anchorage anchor after truncation, and then remove it .The former has effective anchor ability and the latter can keep tendons from dispersing and improve force station w...
