JP3089593B2 - Rebar exploration method using SQUID sensor - Google Patents
Rebar exploration method using SQUID sensorInfo
- Publication number
- JP3089593B2 JP3089593B2 JP26221493A JP26221493A JP3089593B2 JP 3089593 B2 JP3089593 B2 JP 3089593B2 JP 26221493 A JP26221493 A JP 26221493A JP 26221493 A JP26221493 A JP 26221493A JP 3089593 B2 JP3089593 B2 JP 3089593B2
- Authority
- JP
- Japan
- Prior art keywords
- rebar
- reinforcing bar
- squid sensor
- sensor
- present
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
- Measuring Magnetic Variables (AREA)
- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
- Geophysics And Detection Of Objects (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、ＳＱＵＩＤ（Supercon
ducting Quatum Interference Device：超伝導量子干渉
素子）センサを利用してコンクリート中の鉄筋を探査す
る方法に関する。The present invention relates to a SQUID (Supercon
The present invention relates to a method for searching for a reinforcing bar in concrete using a ducting quench interference device (superconducting quantum interference device) sensor.
【０００２】[0002]
【従来の技術及び発明が解決しようとする課題】従来、
コンクリート中の鉄筋探査装置としては、電磁波を用い
た装置や、電磁誘導を利用した装置や、超音波を利用し
た装置などが知られているが、鉄筋の位置や深さを測定
できる限界はコンクリートのかぶり厚さが１５０ｍｍ程
度までであり、また、測定精度も悪いという問題を有し
ている。2. Description of the Related Art
Devices that use electromagnetic waves, devices that use electromagnetic induction, and devices that use ultrasonic waves are known as devices for searching for reinforcing bars in concrete.However, the limit of measuring the position and depth of reinforcing bars is concrete. The fogging thickness is up to about 150 mm, and the measurement accuracy is poor.
【０００３】ところで、生体磁場計測の分野において、
絶対温度近くまで冷却したときに起こるジョセフソン効
果を利用して微小磁場を測定するＳＱＵＩＤセンサが知
られている。In the field of biomagnetic field measurement,
2. Description of the Related Art There is known an SQUID sensor that measures a minute magnetic field by using a Josephson effect that occurs when the device is cooled to a temperature close to an absolute temperature.
【０００４】本発明は上記問題をＳＱＵＩＤセンサを利
用することにより解決するものであって、コンクリート
中の深い位置にある鉄筋を高精度で探査することができ
る鉄筋探査方法を提供することを目的とする。The present invention solves the above-mentioned problem by using a SQUID sensor, and an object of the present invention is to provide a method for searching for a reinforcing bar capable of detecting a reinforcing bar at a deep position in concrete with high accuracy. I do.
【０００５】[0005]
【課題を解決するための手段】そのために、本発明のＳ
ＱＵＩＤセンサを利用した鉄筋探査方法は、。コンクリ
ート中の鉄筋１の方向に対して直角方向に１次微分型Ｓ
ＱＵＩＤセンサ２を並べ、該センサを鉄筋の方向（ｙ方
向）に対して直角方向（ｘ方向）に走査して、鉄筋の方
向（ｙ方向）成分の磁束密度に対して、直角方向（ｘ方
向）の１次微分を測定することにより、鉄筋の位置、深
さを測定することを特徴とする。なお、上記構成に付加
した番号は、本発明の理解を容易にするために図面と対
比させるためのもので、これにより本発明の構成が何ら
限定されるものではない。For this purpose, the present invention relates to
How to search for a reinforcing bar using a QUID sensor. First-order differential type S perpendicular to the direction of reinforcing bar 1 in concrete
Arranging QUID sensor 2, the direction (y direction rebar said sensor
Direction (x direction) with respect to the direction of the rebar, and the first derivative in the direction perpendicular to the direction (x direction) with respect to the magnetic flux density of the direction (y direction) of the rebar is measured. And measuring the depth. The numbers added to the above configuration are for comparison with the drawings to facilitate understanding of the present invention, and the configuration of the present invention is not limited by this.
【０００６】[0006]
【作用】本発明においては、鉄筋の方向（ｙ方向）成分
の磁束密度に対して、直角方向（ｘ方向）の１次微分を
測定するため、鉄筋内の磁場源の向きを考慮する必要が
なく測定が容易になる。In the present invention, it is necessary to consider the direction of the magnetic field source in the reinforcing bar in order to measure the first derivative of the magnetic flux density in the direction (y direction) of the reinforcing bar in the direction perpendicular to the direction (x direction). Measurement becomes easier.
【０００７】[0007]
【実施例】以下、本発明の実施例を図面を参照しつつ説
明する。図１および図２は本発明の１実施例を示し、図
１は鉄筋探査方法を説明するための模式図、図２は測定
データを示す図である。Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show one embodiment of the present invention. FIG. 1 is a schematic diagram for explaining a method of searching for a reinforcing bar, and FIG. 2 is a diagram showing measurement data.
【０００８】図１において、１はコンクリート中に埋設
された鉄筋を示し、この鉄筋１の方向（ｙ方向）に対し
て直角方向（ｘ方向）に１次微分型ＳＱＵＩＤセンサ２
を並べ、１次微分型ＳＱＵＩＤセンサ２をｘ方向に走査
して、鉄筋１で生じる磁束の１次微分を測定する。In FIG. 1, reference numeral 1 denotes a reinforcing bar buried in concrete, and a first-order differential SQUID sensor 2 in a direction (x direction) perpendicular to the direction of the reinforcing bar 1 (y direction).
Are scanned in the x direction by the primary differential type SQUID sensor 2 to measure the primary differential of the magnetic flux generated in the reinforcing bar 1.
【０００９】一般に、磁気双極子ｍが座標原点にあると
き、距離ｒ離れた位置での磁束密度Ｂは、下記式で表
される。Generally, when the magnetic dipole m is at the coordinate origin, the magnetic flux density B at a position separated by a distance r is represented by the following equation.
【００１０】 Ｂ＝−（１／４π）［ｍｒ2 −３（ｍｒ）ｒ］／ｒ5 … 磁気双極子のｘ、ｙ、ｚ方向成分をｍx、ｍy、ｍzと
し、走査線上にて距離ｒ離れた位置での磁束密度の各方
向成分をＢx、Ｂy、Ｂzとすると、ＢxとＢzはｍxとｍz
の関数となるのに対して、Ｂyはｍyの関数となる。Ｂy
は鉄筋内の磁場源の向きに関わらず、ｍyのみにより変
化するため、鉄筋内の磁場源の向きを考慮する必要がな
くなる。またｘ方向に走査したとき、Ｂyは鉄筋を中心
にして対称的に変化するため、測定が容易になる。B = − (1 / 4π) [mr 2 −3 (mr) r] / r 5 ... The x, y, and z components of the magnetic dipole are m x , m y , and m z, and the directional components of the magnetic flux density at a position separated by a distance r Te B x, B y, When B z, B x and B z is m x and m z
Whereas the function, B y is a function of m y. B y
Regardless of the orientation of the magnetic field source within the rebar, to change only the m y, it is not necessary to consider the direction of the magnetic field source within the rebar. Also when scanned in the x direction, B y is to vary symmetrically about the rebar facilitates measurement.
【００１１】式からｘ方向の１次微分を求めると図２
に示すようになり、図２中のｘ1、ｘ2を用いて鉄筋の位
置ｘ0と深さｚ0は下記の式、式で表される。When the first derivative in the x direction is obtained from the equation, FIG.
The position x 0 and the depth z 0 of the reinforcing bar are represented by the following equations using x 1 and x 2 in FIG.
【００１２】[0012]
【数１】 (Equation 1)
【００１３】鉄筋径Ｄが１３ｍｍ、２２ｍｍ、３２ｍｍ
で実験を行ったところ、ｘ0 の精度がσ＝３ｍｍ、式
に対する回帰直線が ｚ0＝−３．７４＋０．９３（ｘ2−ｘ1）；Ｒ＝０．９８ … であった。また、深さｚ0 は３１０ｍｍまで測定でき、
ノイズから換算すると数ｍまで測定可能と思われる。[0013] Reinforcing bar diameter D is 13mm, 22mm, 32mm
As a result, the precision of x 0 was σ = 3 mm, and the regression line for the equation was z 0 = −3.74 + 0.93 (x 2 −x 1 ); R = 0.98. Also, the depth z 0 can be measured up to 310 mm,
When converted from noise, it seems that measurement is possible up to several meters.
【００１４】[0014]
【数２】 (Equation 2)
【００１５】[0015]
【００１６】[0016]
【発明の効果】以上の説明から明らかなように本発明に
よれば、深い位置にある鉄筋の微小磁場の計測が可能に
なるので、従来の鉄筋探査方法に比較して、より深い位
置にある鉄筋を高い空間分解能で、鉄筋内の磁場の向き
をそろえる必要なく、鉄筋の位置、深さを測定すること
ができる。According to apparent the present invention from the above description, deep since it is possible to measure the minute magnetic field rebar in position, as compared with the conventional reinforcing bars exploration methods, more deep position
Direction of the magnetic field inside the rebar with high spatial resolution
Measuring the position and depth of rebar without having to align
Can be .
【図１】本発明の１実施例を示し、鉄筋探査方法を説明
するための模式図である。FIG. 1 is a schematic diagram illustrating an embodiment of the present invention and illustrating a method for searching for a reinforcing bar.
【図２】本発明における測定原理を示す図である。FIG. 2 is a diagram showing a measurement principle in the present invention.
１…鉄筋、２…１次微分型ＳＱＵＩＤセンサ 1. Reinforcing bar, 2. Primary differential SQUID sensor
───────────────────────────────────────────────────── フロントページの続き (72)発明者 茅根 一夫 千葉県千葉市美浜区中瀬１丁目８番地 セイコー電子工業株式会社内 (72)発明者 中山 哲 千葉県千葉市美浜区中瀬１丁目８番地 セイコー電子工業株式会社内 (56)参考文献 特開 昭62−98287（ＪＰ，Ａ) 特開 平２−290588（ＪＰ，Ａ) 特開 昭58−210683（ＪＰ，Ａ) 特開 平４−232482（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) G01V 3/08 G01B 7/00 G01N 27/72 G01R 33/035 ZAA ──────────────────────────────────────────────────続 き Continuing on the front page (72) Kazuo Chine 1-8-8 Nakase, Mihama-ku, Chiba-shi, Chiba Seiko Electronic Industries Co., Ltd. (72) Inventor Satoshi Nakayama 1-8-1, Nakase, Mihama-ku, Chiba-shi, Chiba (56) References JP-A-62-98287 (JP, A) JP-A-2-290588 (JP, A) JP-A-58-210683 (JP, A) JP-A-4-232482 ( JP, A) (58) Fields investigated (Int. Cl. 7 , DB name) G01V 3/08 G01B 7/00 G01N 27/72 G01R 33/035 ZAA
Claims (1)
方向に１次微分型ＳＱＵＩＤセンサを並べ、該センサを
鉄筋の方向に対して直角方向に走査して、鉄筋の方向成
分の磁束密度に対して、直角方向の１次微分を測定する
ことにより、鉄筋の位置、深さを測定することを特徴と
するＳＱＵＩＤセンサを利用した鉄筋探査方法。1. A first-order differential SQUID sensor is arranged in a direction perpendicular to the direction of a reinforcing bar in concrete, and the sensor is
The position and depth of the rebar are measured by scanning in the direction perpendicular to the direction of the rebar and measuring the first derivative in the direction perpendicular to the magnetic flux density of the directional component of the rebar. A method for searching for a reinforcing bar using a SQUID sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26221493A JP3089593B2 (en) | 1993-10-20 | 1993-10-20 | Rebar exploration method using SQUID sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26221493A JP3089593B2 (en) | 1993-10-20 | 1993-10-20 | Rebar exploration method using SQUID sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07120558A JPH07120558A (en) | 1995-05-12 |
| JP3089593B2 true JP3089593B2 (en) | 2000-09-18 |
Family
ID=17372669
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26221493A Expired - Fee Related JP3089593B2 (en) | 1993-10-20 | 1993-10-20 | Rebar exploration method using SQUID sensor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3089593B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006103910A1 (en) * | 2005-03-25 | 2006-10-05 | Kyushu Institute Of Technology | Nondestructive inspection method and device |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5013363B2 (en) * | 2005-10-11 | 2012-08-29 | 国立大学法人大阪大学 | Nondestructive inspection equipment |
| CN101907693B (en) * | 2010-07-07 | 2013-01-09 | 中国科学院上海微系统与信息技术研究所 | Method for quantitatively calibrating and eliminating crosstalk of SQUID (Superconducting Quantum Interference Device) planar three-shaft magnetometer |
-
1993
- 1993-10-20 JP JP26221493A patent/JP3089593B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006103910A1 (en) * | 2005-03-25 | 2006-10-05 | Kyushu Institute Of Technology | Nondestructive inspection method and device |
| JPWO2006103910A1 (en) * | 2005-03-25 | 2008-09-04 | 国立大学法人九州工業大学 | Nondestructive inspection method and device |
| JP4639339B2 (en) * | 2005-03-25 | 2011-02-23 | 国立大学法人九州工業大学 | Nondestructive inspection method and apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07120558A (en) | 1995-05-12 |
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