Title:
DAMAGE LOCATING SYSTEM FOR STRUCTURE
Document Type and Number:
Japanese Patent JP3540067
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a method for locating a damage of a structure of concrete, for example, due to earthquake conveniently.
SOLUTION: A shape memory alloy wire 1 of NiTi or a superelastic alloy wire 2 is embedded in concrete 3. When the concrete 3 is damaged due to earthquake or the like, an ultrasonic wave 5 is transmitted through the shape memory alloy wire 1 or a superelastic allay wire 2 from the end part thereof. The ultrasonic wave 5 is reflected from a damaged part (a) and returned back to the end part. Assuming the time required for the ultrasonic wave transmitted through the shape memory alloy wire 1 or superelastic alloy wire 2 from the end part thereof to return back to the end part is T and the propagation speed of an ultrasonic wave through the shape memory alloy wire 1 or superelastic alloy wire 2 is V, the distance L to the damaged position (part a) from the end of the shape memory alloy wire 1 or the superelastic alloy wire 2 can be determined according to a formula; L=(V.T) /2.
Inventors:
Tadahiro Kakizawa
Sadatoshi Ohno
Takatoshi Ogawa
Toshio Saito
Sadatoshi Ohno
Takatoshi Ogawa
Toshio Saito
Application Number:
JP27421695A
Publication Date:
July 07, 2004
Filing Date:
October 23, 1995
Export Citation:
Assignee:
TAKENAKA CORPORATION
International Classes:
G01N29/04; G01N29/00; G01N29/07; G01N29/22; G01N29/44; (IPC1-7): G01N29/10; G01N29/22
Domestic Patent References:
| JP61264253A |
Other References:
柿沢忠弘他1名,「コンクリート部材の知能化のための材料の基礎的研究」,コンクリート工学年次論文報告集,日本,社団法人日本コンクリート工学協会,1994年 6月 3日,第16巻第1号,第771-776頁
Attorney, Agent or Firm:
Atsushi Nakajima
Kato Kazunori
Katsuichi Nishimoto
Hiroshi Fukuda
Kato Kazunori
Katsuichi Nishimoto
Hiroshi Fukuda