Technical differences in worldwide latest standards for prestress anchors

The anchor technology in China's standards has some room for improvement compared with the foreign ones. Based on the latest standards of European Union, USA and Japan, some suggestions are put forward: (1) An anchor structure division method is proposed, that is, the internal structure is divided into tendon bond length, tendon free length and tension length. (2) The base tests are adjusted and subdivided into investigation test and suitability test. (3) The apparent free length can be used as the deformation evaluation index for anchor tests instead of elastic deformation. (4) The technical requirements for setting the packer between fixed length and free length are investigated. (5) Only the load control tension method can be used for the load dispersion anchor. (6) The lift-off check for resident load on the anchor tendon should be studied and added. (7) The lock load should be raised to more than 0.9 times the design load.