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一种自钻式差异注浆组合锚杆及其锚固方法

  • Release time:2020-10-30
  • Hits:
  • School Sign: 

    第一单位
  • Type of Patent: 

    国内
  • State of Patent: 

    专利授权
  • Application Number: 

    201710815492.3
  • Number of Inventors: 

    1
  • Service Invention or Not: 

    no
  • Application Date: 

    2017-09-12
  • Authorization Date: 

    2020-05-19
  • First Author: 

    Guoan Xu