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Title:
DAMAGE EVALUATION METHOD AND DAMAGE EVALUATION DEVICE FOR MAGNETIC LINEAR OBJECT
Document Type and Number:
WIPO Patent Application WO/2018/100709
Kind Code:
A1
Abstract:
A damage evaluation device (1) is installed and used on a concrete structure in which a tendon (10) to be evaluated for damage is embedded, and includes a magnetizer (20) for generating a magnetic force, and detectors (41F, 41R, 61) for detecting an amount of magnetic variation occurring from a damaged location of the tendon (10) magnetized by the generated magnetic force. The magnetizer includes: an excitation coil (24); an iron core (26) inserted in a center hole of the excitation coil; a pair of columnar yokes (31F, 31R) connected to both ends of the iron core and each extending toward the concrete surface; and a pair of plate-shaped yokes (32F, 32R) for forming magnetic poles having a spread along the concrete surface, the plate-shaped yokes (32F, 32R) being connected to respective distal ends of the pair of columnar yokes. An electric current is caused to flow through the excitation coil, whereby a magnetic circuit is formed by a yoke shaft, the pair of columnar yokes, the pair of plate-shaped yokes, and the range of the tendon that is positioned between the pair of plate-shaped yokes.

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Inventors:
ITOI HIROAKI (JP)
SHIIKI SADANORI (JP)
SUGAHARA MASAMICHI (JP)
MORIYA TOSHIYUKI (JP)
Application Number:
PCT/JP2016/085704
Publication Date:
June 07, 2018
Filing Date:
December 01, 2016
Export Citation:
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Assignee:
TOKYO ROPE MFG CO (JP)
International Classes:
G01N27/82; G01N27/83
Foreign References:
JP2005292111A2005-10-20
JP2004279245A2004-10-07
JPH09113592A1997-05-02
JP2014062745A2014-04-10
JPS62276454A1987-12-01
JP3163378U2010-10-14
Other References:
H. -J. KRAUSE ET AL.: "SQUID array for magnetic inspection of prestressed concrete bridges", PHYSICA C, vol. 368, 2002, pages 91 - 95, XP004336187, DOI: doi:10.1016/S0921-4534(01)01145-5
Attorney, Agent or Firm:
PATENT PROFESSIONAL CORPORATION TOKYO UIT INTERNATIONAL et al. (JP)
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