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Method and equipment for inspecting reinforced concrete pipe

  • US 7,360,462 B2
  • Filed: 04/10/2003
  • Issued: 04/22/2008
  • Est. Priority Date: 05/08/2002
  • Status: Expired due to Term
First Claim
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1. An inspection method for reinforced concrete pipes for inspecting the deterioration state of a reinforced concrete pipe inside the pipe, comprising the steps of:

  • measuring propagation waves of a pipe to be inspected by carrying out an impact elastic wave test;

    analyzing the resonant frequency spectrum of the propagation waves; and

    determining the deterioration level based on the area ratio between an area of a high frequency component and an area of a low frequency component in the resonant frequency spectrum.

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