JPH10153568A - Crack sensor for concrete structure - Google Patents
Crack sensor for concrete structureInfo
- Publication number
- JPH10153568A JPH10153568A JP31154796A JP31154796A JPH10153568A JP H10153568 A JPH10153568 A JP H10153568A JP 31154796 A JP31154796 A JP 31154796A JP 31154796 A JP31154796 A JP 31154796A JP H10153568 A JPH10153568 A JP H10153568A
- Authority
- JP
- Japan
- Prior art keywords
- frame
- concrete structure
- sensor
- crack
- crack sensor
- 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.)
- Pending
Links
Landscapes
- Working Measures On Existing Buildindgs (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術の分野】本発明は、コンクリート構
造物のひび割れを検出する技術分野に属する。The present invention belongs to the technical field of detecting cracks in concrete structures.
【０００２】[0002]
【従来の技術】従来、コンクリート構造物のひび割れの
発生の有無を調べるのは専ら目視により行われている。2. Description of the Related Art Conventionally, whether or not a crack has occurred in a concrete structure is examined exclusively by visual observation.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、この目
視による方式は、人間の目に頼っているので検査の専門
家が必要でありコスト高になると共に、人間の目に頼っ
ているぶん検出の信頼性が低いという問題を有し、ま
た、検査員が近くまでいく必要があるので、足場が必要
となりコスト高になると共に、１日に多くの箇所の検査
ができず検査速度が遅くコスト高になり、さらに、人間
の近づけない部位は検査できないという問題を有してい
る。However, since this visual method relies on the human eye, an inspection specialist is required, which increases the cost, and the reliability of the detection depends on the human eye. In addition, there is a problem that the testability is low, and it is necessary for the inspector to be close. In addition, there is a problem that a part that cannot be approached by a human cannot be inspected.
【０００４】本発明は、上記従来の問題を解決するもの
であって、簡単、高精度且つ低コストでコンクリート構
造物のひび割れを検出することができるセンサを提供す
ることを目的とする。An object of the present invention is to solve the above-mentioned conventional problems, and an object of the present invention is to provide a sensor capable of detecting cracks in a concrete structure simply, accurately and at low cost.
【０００５】[0005]
【課題を解決するための手段】そのために、本発明のコ
ンクリート構造物用ひび割れセンサは、コンクリート構
造物９内部の表面近傍に設置されるひび割れセンサ１で
あって、フレーム２と、該フレームに巻回された導電性
繊維線３とを備えたことを特徴とし、請求項２記載の発
明は、請求項１において、上記導電性繊維線が炭素繊維
からなることを特徴とし、請求項３記載の発明は、請求
項１又は２において、上記フレームに固定される取付用
フレーム４と、該取付用フレームに形成された鉄筋７取
付用の係合部６とを備えたことを特徴とする。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もので、これにより本発明が何ら
限定されるものではない。For this purpose, a crack sensor for a concrete structure according to the present invention is a crack sensor 1 installed near a surface inside a concrete structure 9, comprising a frame 2 and a coil wound around the frame. The invention according to claim 2 is characterized in that the conductive fiber line is made of carbon fiber, and the conductive fiber line is made of carbon fiber. The present invention is characterized in that, in the first or second aspect, a mounting frame 4 fixed to the frame and an engaging portion 6 formed on the mounting frame for mounting a reinforcing bar 7 are provided. Note that the numbers added to the above configuration are compared with the drawings for easy understanding of the present invention, and the present invention is not limited thereto.
【０００６】[0006]
【発明の実施の形態】以下、本発明の実施の形態を図面
を参照しつつ説明する。図１〜図３は、本発明のコンク
リート構造物用ひび割れセンサの１実施形態を示す平面
図、図２はセンサをコンクリート内に設置した状態を示
す断面図、図３はセンサの端子部の拡大断面図である。Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 are plan views showing an embodiment of a crack sensor for a concrete structure according to the present invention, FIG. 2 is a sectional view showing a state where the sensor is installed in concrete, and FIG. 3 is an enlarged view of a terminal portion of the sensor. It is sectional drawing.
【０００７】図１において、ひび割れセンサ１は、合成
樹脂や繊維強化プラスチック等の絶縁性材料からなるフ
レーム２と、フレーム２に巻回された炭素繊維線３と、
フレーム２の裏側に固定された取付用フレーム４（図２
参照）とから構成されている。フレーム２は、矩形状の
外枠２ａと、外枠２ａの長辺の間に一体に連結された補
強枠２ｂとを備え、炭素繊維線３をフレーム２の長手方
向に巻回し、炭素繊維線３が外枠２ａ及び補強枠２ｂに
接する箇所は接着剤にて固定し、フレーム２の外側にリ
ード線５を接続している。In FIG. 1, a crack sensor 1 includes a frame 2 made of an insulating material such as a synthetic resin or a fiber reinforced plastic, a carbon fiber wire 3 wound around the frame 2,
The mounting frame 4 fixed to the back side of the frame 2 (FIG. 2)
Reference). The frame 2 includes a rectangular outer frame 2a and a reinforcing frame 2b integrally connected between long sides of the outer frame 2a, and the carbon fiber wire 3 is wound in the longitudinal direction of the frame 2 to form a carbon fiber wire. 3 is fixed with an adhesive at a position where it contacts the outer frame 2a and the reinforcing frame 2b, and a lead wire 5 is connected to the outside of the frame 2.
【０００８】炭素繊維線３の巻き付け間隔は、コンクリ
ートの骨材の大きさ、検出したいひび割れ幅（長さに関
係してくる）にもよるが、大略１００ｍｍから２００ｍ
ｍが好ましく、フレーム２の大きさも構造物の規模にも
よるが、大略３００×２０００ｍｍから１０００×４０
００ｍｍが好ましい。The winding interval of the carbon fiber wire 3 depends on the size of the concrete aggregate and the width of the crack to be detected (depending on the length), but is generally from 100 mm to 200 m.
m is preferable, and although it depends on the size of the frame 2 and the scale of the structure, it is approximately 300 × 2000 mm to 1000 × 40 mm.
00 mm is preferred.
【０００９】図２に示すように、取付用フレーム４は、
フレーム２と同様に、合成樹脂や繊維強化プラスチック
等の絶縁性材料からなり、フレーム２と同様の外枠４ａ
を有し、外枠４ａには、鉄筋取付用のフック状の係合部
６が一体に形成されている。そして、係合部６を鉄筋７
に係合させることにより、ひび割れセンサ１を鉄筋７に
固定し、その後コンクリートを打設し、コンクリート構
造物９を構築するものである。As shown in FIG. 2, the mounting frame 4 is
Similarly to the frame 2, the outer frame 4a is made of an insulating material such as a synthetic resin or a fiber-reinforced plastic.
The outer frame 4a is integrally formed with a hook-shaped engaging portion 6 for attaching a reinforcing bar. Then, the engaging portion 6 is connected to the reinforcing bar 7.
To fix the crack sensor 1 to the reinforcing bar 7 and then cast concrete to build a concrete structure 9.
【００１０】図３はセンサの端子部の構造を示してい
る。炭素繊維はハンダ付けができないので、炭素繊維線
３と極細銅線１０で粗く巻いて束ね、導電性接着剤１１
ａで固めた後、リード線５と固めた炭素繊維線３とを改
めて導電性接着剤１１ｂで固め、さらに、熱収縮ビニー
ル管１２を被せ、加熱して接点部分を固定し、最後にフ
レーム２にバインド線で縛着し固定する。FIG. 3 shows the structure of the terminal portion of the sensor. Since the carbon fiber cannot be soldered, the carbon fiber wire 3 and the ultrafine copper wire 10 are roughly wound and bundled, and the conductive adhesive 11
a), the lead wire 5 and the hardened carbon fiber wire 3 are hardened again with the conductive adhesive 11b, further covered with a heat-shrinkable vinyl tube 12 and heated to fix the contact portions. And secure it with a binding wire.
【００１１】以上のようにして、コンクリート構造物９
内部の表面近傍にひび割れセンサ１を設置することがで
き、しかも、コンクリート打設時に位置がずれて鉄筋と
接触して漏電したり電気腐食したりするのを防止するこ
とができる。コンクリートにひび割れが入ると炭素繊維
線３が破断しその電気抵抗が急激に増大する。従って、
リード線５にテスター等の計測器を接続し電気抵抗を測
定することによりひび割れの有無を簡単に高精度で検知
することができると共に、端子と計測器の着脱による測
定誤差が多少あっても無視できるので、１台の計測器で
何点も転用して計測できる。As described above, the concrete structure 9
The crack sensor 1 can be installed in the vicinity of the inner surface, and furthermore, it is possible to prevent the position from being shifted at the time of placing the concrete and coming into contact with the reinforcing steel bar, thereby preventing the electric leakage or the electric corrosion. If the concrete cracks, the carbon fiber wire 3 breaks and the electric resistance increases rapidly. Therefore,
By connecting a measuring instrument such as a tester to the lead wire 5 and measuring the electric resistance, the presence or absence of cracks can be easily detected with high accuracy, and even if there is some measurement error due to the attachment and detachment of the terminal and the measuring instrument, it is ignored. It is possible to convert and measure many points with one measuring instrument.
【００１２】また、常時モニタリングの必要は無く、必
要なときに或いは定期的に計測すればよく、計測器もテ
スターのような簡便なもので済むのでコストがあまりか
からない。また、計測の自動化も簡単に行うことができ
る。さらに、構造物から離れていてもコンクリートのひ
び割れ発生の有無を検査できるので、検査用の足場が不
要となりコストを低減させることができる。Further, there is no need for constant monitoring, and measurement may be performed when necessary or at regular intervals. Since a simple measuring device such as a tester may be used, the cost is low. In addition, automation of measurement can be easily performed. Furthermore, since the presence / absence of cracks in concrete can be inspected even if it is away from the structure, a scaffold for inspection is not required and the cost can be reduced.
【００１３】また、取付用フレーム４を用いることによ
り、ひび割れセンサをコンクリート構造物９の内部にお
ける表面近傍に簡単に精度良く設置することができる。The use of the mounting frame 4 makes it possible to easily and accurately install the crack sensor near the surface inside the concrete structure 9.
【００１４】以上、本発明の実施の形態について説明し
たが、本発明はこれに限定されるものではなく種々の変
更が可能である。例えば、上記実施形態においては、炭
素繊維線３を用いているが、これは導電性を有する繊維
のうち破断伸びが最も小さく、ひび割れセンサに最適な
ものであるが、これに限定されるものではなく、コンク
リート打設時の強度に耐え、且つ、破断伸びの小さい導
電性材料からなる導電性繊維線であればよい。Although the embodiment of the present invention has been described above, the present invention is not limited to this, and various modifications can be made. For example, in the above embodiment, the carbon fiber wire 3 is used, which is the smallest in elongation at break among conductive fibers, and is most suitable for a crack sensor, but is not limited thereto. Instead, any conductive fiber wire made of a conductive material that can withstand the strength at the time of placing concrete and has a small breaking elongation may be used.
【００１５】また、上記実施形態においては、取付用フ
レーム４を用い鉄筋取付用係合部６により、ひび割れセ
ンサ１を鉄筋７に取り付けているが、取付用フレーム４
は必ずしも必要なものではなく、フレーム２を絶縁性の
取付部材により直接、鉄筋７に取り付けるようにしても
よい。In the above embodiment, the crack sensor 1 is attached to the reinforcing bar 7 by the reinforcing bar attaching portion 6 using the attaching frame 4.
Is not always necessary, and the frame 2 may be directly attached to the reinforcing bar 7 by an insulating attachment member.
【図１】本発明のコンクリート構造物用ひび割れセンサ
の１実施形態を示す平面図である。FIG. 1 is a plan view showing one embodiment of a crack sensor for a concrete structure of the present invention.
【図２】図１のセンサをコンクリート内に設置した状態
を示す断面図である。FIG. 2 is a sectional view showing a state where the sensor of FIG. 1 is installed in concrete.
【図３】図１のセンサの端子部の拡大断面図である。FIG. 3 is an enlarged sectional view of a terminal portion of the sensor of FIG.
１…ひび割れセンサ、２…フレーム、３…炭素繊維線
（導電性繊維線） ４…取付用フレーム、５…リード線、６…鉄筋取付用係
合部、７…鉄筋 ９…コンクリート構造物DESCRIPTION OF SYMBOLS 1 ... Crack sensor, 2 ... Frame, 3 ... Carbon fiber wire (conductive fiber wire) 4 ... Mounting frame, 5 ... Lead wire, 6 ... Reinforcing bar mounting engaging part, 7 ... Reinforcing bar 9 ... Concrete structure
Claims (3)
されるひび割れセンサであって、フレームと、該フレー
ムに巻回された導電性繊維線とを備えたことを特徴とす
るコンクリート構造物用ひび割れセンサ。A crack sensor installed near a surface inside a concrete structure, comprising: a frame; and a conductive fiber wire wound around the frame. Sensor.
を特徴とする請求項１記載のコンクリート構造物用ひび
割れセンサ。2. The crack sensor for a concrete structure according to claim 1, wherein said conductive fiber wire is made of carbon fiber.
と、該取付用フレームに形成された鉄筋取付用の係合部
とを備えたことを特徴とする請求項１又は２記載のコン
クリート構造物用ひび割れセンサ。3. The concrete structure according to claim 1, further comprising a mounting frame fixed to said frame, and an engaging portion formed on said mounting frame for mounting a reinforcing bar. For crack sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31154796A JPH10153568A (en) | 1996-11-22 | 1996-11-22 | Crack sensor for concrete structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31154796A JPH10153568A (en) | 1996-11-22 | 1996-11-22 | Crack sensor for concrete structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH10153568A true JPH10153568A (en) | 1998-06-09 |
Family
ID=18018557
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP31154796A Pending JPH10153568A (en) | 1996-11-22 | 1996-11-22 | Crack sensor for concrete structure |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH10153568A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101461657B1 (en) * | 2013-05-02 | 2014-11-20 | 조명기 | Mortar hardening process monitoring/measuring system of concrete and mortar hardening process monitoring/measuring method of concrete |
| JP2016024147A (en) * | 2014-07-24 | 2016-02-08 | 公益財団法人鉄道総合技術研究所 | Crack detection sensor and measurement method |
| CN112160240A (en) * | 2020-10-23 | 2021-01-01 | 同济大学 | Stress damage self-induction concrete bridge deck and manufacturing method |
| CN113189146A (en) * | 2021-04-16 | 2021-07-30 | 国网甘肃省电力公司经济技术研究院 | Device and method for monitoring ground fissure landslide by conductive concrete grounding network |
-
1996
- 1996-11-22 JP JP31154796A patent/JPH10153568A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101461657B1 (en) * | 2013-05-02 | 2014-11-20 | 조명기 | Mortar hardening process monitoring/measuring system of concrete and mortar hardening process monitoring/measuring method of concrete |
| JP2016024147A (en) * | 2014-07-24 | 2016-02-08 | 公益財団法人鉄道総合技術研究所 | Crack detection sensor and measurement method |
| CN112160240A (en) * | 2020-10-23 | 2021-01-01 | 同济大学 | Stress damage self-induction concrete bridge deck and manufacturing method |
| CN113189146A (en) * | 2021-04-16 | 2021-07-30 | 国网甘肃省电力公司经济技术研究院 | Device and method for monitoring ground fissure landslide by conductive concrete grounding network |
| CN113189146B (en) * | 2021-04-16 | 2024-05-28 | 国网甘肃省电力公司经济技术研究院 | Device and method for monitoring ground crack landslide through conductive concrete grounding grid |
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