Technical differences in worldwide latest standards for prestress anchors
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摘要: 与国外相比,国内锚杆标准中的技术尚有改进空间。借鉴欧美日最新标准,建议：增加一种锚杆结构划分方法,即按内部结构划分为黏结段、非黏结段及张拉段;基本试验可调整细分为基本调查试验及适应试验,并将前者定性为探究性试验;可采用表观自由长度替代弹性变形以作为锚杆抗拔试验变形评价指标;研究及增加在锚固段与自由段分界处设置止浆塞的技术要求;明确荷载分散型锚杆的张拉只应采用荷载控制方法;研究及增加对锚筋驻留荷载的提离检查;锚杆锁定荷载提高至不小于0.9倍设计承载力。Abstract: 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.
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Keywords:
- anchor structure /
- base test /
- apparent free length /
- packer /
- load control tension method /
- lift-off check /
- lock load
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