JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE) ›› 2009, Vol. 39 ›› Issue (4): 145-148.

• Articles • Previous Articles     Next Articles

Analysis and control of pre-stressing loss in construction  techniques of anchor-eye

  

  1. 1.Geotechnical and Structural  Engineering Research Center,  ShandongUniversity, Jinan 250061， China;
    2. Departmentof resource and civil engineering of  Shandong University of Science and Technology, Taian 271019, China
  • Received:2009-05-04 Online:2009-08-24 Published:2009-08-24

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Abstract:

The mechanism of the anchoring effect of the anchorage cable is very complicated because there are many factors including the materials, the anchor clamping, the quality of anchorage cable and the construction techniques. The effects and control method of the construction techniques on the prestressing loss were studied. Based on the analysis of anchor eye bending and its deviation, a theoretical formula of prestressing loss of friction was deduced, which accords with the  practice of engineering and has more practical meaning. The results showed that the pore theory formula for calculating friction loss works more in line with engineering practice. The hole slope of the drilling anchor holes had relativity with the loss of power, that was, when the hole slope became larger, the power loss of the anchoring cable gets larger. With the same slope  n, anchor pullloading (P) became greater as the loss of anchoring force became larger.The anchor force loss caused by channel pore forming could be reduced by the adoption of appropriate measures.

Key words: construction technics of anchor eye, prestressing loss,  , analysis, control

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