JPS6283654A - Method for measuring ae in concrete structure - Google Patents
Method for measuring ae in concrete structureInfo
- Publication number
- JPS6283654A JPS6283654A JP60225426A JP22542685A JPS6283654A JP S6283654 A JPS6283654 A JP S6283654A JP 60225426 A JP60225426 A JP 60225426A JP 22542685 A JP22542685 A JP 22542685A JP S6283654 A JPS6283654 A JP S6283654A
- Authority
- JP
- Japan
- Prior art keywords
- concrete structure
- long hole
- sensor
- hole
- liquid
- 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
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
Abstract
Description
【発明の詳細な説明】
［発明の［」的１
産−て上ｐー机囲ラｌ升
本発明は、コンクリート、鉄筋コンクリートあるいは鉄
骨鉄筋コンクリート等のコンクリート構造物がひび割れ
等にょＩ）微小破壊ｔ′丁を生ずる際に、構造物内部に
Ｍ積された歪エネルギーが放出されて微小破壊音を発生
する現永［以下ＡＩ−（アフースティノク・エミンンヨ
ン）という１を利用した計測方法に関し、待に、微小破
壊音などのＡＥ倍信号２個以」−のセンサーまで・到達
する時間の差によりひび割れ位置等の発生源を標定する
方法に係るものである。[Detailed Description of the Invention] [Purpose of the Invention] [Object 1] The present invention is aimed at preventing cracks, etc. in concrete structures such as concrete, reinforced concrete, or steel reinforced concrete. Regarding the measurement method using AI (hereinafter referred to as AI-1), the strain energy accumulated inside the structure is released to generate microfracture sounds. This invention relates to a method of locating the source of a crack, etc., based on the difference in the time it takes for two or more AE multiplied signals, such as sounds, to reach a sensor.
従迷の技術
従来、コンクリート構造物のひび割れ位置を評定する方
法としては、第５図に示すように、例えば梁等のコンク
リート構造物１の両端部にＡＥセンサー２を取り付け、
ＡＥ倍信号到達時間差からひび割れＣ１の発生位置を算
出していた。また、コンクリート面へセンサーを直接取
り付けるのに、接着材を用いるか、グリスを塗って接触
させておくのが常であった。Conventional techniques Conventionally, as shown in FIG. 5, a method for evaluating the location of cracks in a concrete structure involves attaching AE sensors 2 to both ends of a concrete structure 1, such as a beam.
The location of crack C1 was calculated from the difference in arrival time of the AE multiplied signal. Additionally, when attaching sensors directly to concrete surfaces, it was customary to use adhesive or apply grease to maintain contact.
兄□叩プ月怪夛Ｕ２ようとする問題、曽しかしながら、
上記第５図に示すように、例えば二次のひび割れＣ２が
生じた場合、これによるＡＥ（３号は一次のひび古りれ
Ｃ７によって遮られて非常に微小になってしまうか、あ
るいはこの−次ひび割れＣ１を迂回してセンサー２に到
達することになる。Brother □The problem of trying to hit Tsuki Kaidan U2, So, however,
As shown in Fig. 5 above, for example, if a secondary crack C2 occurs, the resulting AE (No. 3 will be blocked by the primary crack C7 and become very small, or this - The next step is to bypass the crack C1 and reach the sensor 2.
このように、後発のひび割れＣ２は既存のひび割れＣ１
により大きく影響を受けるため、位ｉｆｆの割り出し計
算がほとんど不可能な状態であった。In this way, the subsequent crack C2 is similar to the existing crack C1.
Therefore, it has been almost impossible to calculate the position iff.
また、上述のような従来のセンサー取付は方法では、セ
ンサーの取り外しに手間がかかったり、グリス、は測定
中にコンクリート内に吸収されるため受信特性が変化し
てしまう等の問題点があった。In addition, the conventional sensor mounting method described above has problems such as it takes time to remove the sensor, and the reception characteristics change because grease is absorbed into the concrete during measurement. .
本発明は上記問題点を解決するためになされたもので、
その目的とするところは、コンクリート構造物が無ひび
割れの状態から崩壊に至るまでの間に次々発生するひび
割れを、どの時期においても正確に測定することが可能
て゛あり、しかも既存構造物のモニター計測等が可能と
なるＡＩＥの新規な計測方法を提供するにある。The present invention has been made to solve the above problems,
The purpose is to be able to accurately measure cracks that occur one after another in a concrete structure from a crack-free state to collapse at any time, and also to monitor existing structures. The purpose of the present invention is to provide a new AIE measurement method that enables the following.
［発明の構成１
■慎乏邂訣１艷犬カーへＬ閃
本発明のコンクリート構造物におけるＡＥの計測方法は
、フンクＩＪ −） ｖＩ構造物内部に長穴を穿孔して
、その中に直接水等の液体を封入するか、或いは管体を
挿入して構造物内に定着させ、該管体の中に液体を封入
すると共にＡＥセンサーを設置し、必要に応じてＡＥセ
ンサーを移動自在に配設したり複数個配設して、コンク
リート構造物内に発生した微小破壊ｔ１の到達時間を測
定し、その発生源を標定することを特徴とするものであ
る。[Configuration of the Invention 1 ■ Modesty Measures 1. The method of measuring AE in a concrete structure of the present invention is as follows. Enclose a liquid such as water or insert a tube to fix it in the structure, seal the liquid in the tube and install an AE sensor, and make the AE sensor movable as necessary. The present invention is characterized in that it measures the arrival time of micro-fractures t1 generated in a concrete structure by arranging a plurality of micro-fractures t1 and locating the source thereof.
尺舟釘
以下、本発明の実施例について図面を参照しながら説明
する。Hereinafter, embodiments of the present invention will be described with reference to the drawings.
第１図において、１は例えば梁等のコンクリート構造物
であって、その艮手力向に互って削岩磯等で長穴２を穿
孔する。In FIG. 1, reference numeral 1 denotes a concrete structure such as a beam, and elongated holes 2 are bored in the opposite directions of the concrete structure using a rock-cutting rock or the like.
該１と穴２内には水等の液体３を注入すると共に、その
両側には栓体４，４を取付けて、液体３を長穴２内に封
入する。尚、上記長穴２は必ずしも１”［通させる必要
はなく、−側が盲になっていても良い。この場合には、
一端開口側のみ栓体４を取付ける。また、長穴２は直線
状に穿設する必要はなく、カーブしていても良い。A liquid 3 such as water is injected into the hole 1 and the hole 2, and plugs 4, 4 are attached to both sides of the hole 2 to seal the liquid 3 into the elongated hole 2. It should be noted that the elongated hole 2 does not necessarily have to be made to pass through 1", and may be blind on the - side. In this case,
Attach the plug 4 only on the open end side. Further, the elongated hole 2 does not need to be formed in a straight line, but may be curved.
一ト記長穴２の両端部には圧電素子等のＡＥ変換子から
成るＡＥセンサー５を配設し、適宜増幅器、時間差測定
器等（図示せず）を介してコンピューターに接続してお
く。An AE sensor 5 consisting of an AE transducer such as a piezoelectric element is provided at both ends of the elongated hole 2, and is connected to a computer via an appropriate amplifier, time difference measuring device, etc. (not shown).
従って、上記梁状コンクリート構造物１に応勾が働いて
、ひび割れＣが発生すると、これによるコンクリートの
微小破壊音が両側のＡＥセンサー５に受信されると共に
、両ＡＥセンサー５への到達時間差によって位置を算出
し標定することができる。Therefore, when a crack C occurs due to the gradient acting on the beam-like concrete structure 1, the minute cracking sound of the concrete caused by this is received by the AE sensors 5 on both sides, and due to the difference in arrival time to both AE sensors 5. The position can be calculated and oriented.
尚、上記ＡＣセンサー５を長穴２内に沿って移動自在に
設置することにより、発生源付近まて゛移動させて、破
壊音の減衰１こよる受イｄ難を解消したり、或いは２以
上の複数のＡＣセンサー４を配置して標定精度を向上せ
しめることら小米る。By installing the AC sensor 5 movably along the elongated hole 2, it is possible to move it near the source and eliminate the difficulty caused by the attenuation of destructive sound. Xiaomi Ru is equipped with multiple AC sensors 4 to improve the location accuracy.
更に、１ユ記艮穴２を平行状、直交状、斜め状、或いは
任意の方向に複数本あけると共に、これらの長穴２内に
複数のＡＥセンサーを配置することにより、ＡＥ発生源
を直線的、平面的、立体的に高精度に位置標定すること
ができる。Furthermore, by drilling a plurality of holes 2 in parallel, perpendicular, diagonal, or arbitrary directions, and arranging a plurality of AE sensors in these elongated holes 2, the AE source can be located in a straight line. It is possible to locate the position with high precision in a target, two-dimensional, and three-dimensional manner.
第２図はコンクリート構造物１に穿孔した長穴２内にｗ
Ｉ管等の管体６を挿設して、晟管体６と長穴２との間隙
にコンクリートモルタル等の固体充填材や水等の液体充
填材を充填し、この管体６中に水等の液体３を入れて、
栓体４にて封入すると共に、該管体６の両端部にＡＥセ
ンサー５を取付けて、コンクリート１内に発生したＡＥ
を測定せしめるようにしたものである。Figure 2 shows a hole 2 drilled in a concrete structure 1.
A pipe body 6 such as an I pipe is inserted, and the gap between the straight pipe body 6 and the long hole 2 is filled with a solid filler such as concrete mortar or a liquid filler such as water. Add liquid 3 such as
In addition to sealing with a plug body 4, AE sensors 5 are attached to both ends of the pipe body 6 to detect AE generated in the concrete 1.
It is designed to allow the measurement of
本実施例においても、ＡＥセンサー５を管体６内に移動
自在に配設したり、複数個配置して標定精度を向−Ｊ二
せしめることができる。In this embodiment as well, the AE sensor 5 can be movably disposed within the tubular body 6, or a plurality of AE sensors 5 can be disposed to improve the positioning accuracy.
第３図は、橋脚におけるＡＥ計測の応用例を示すもので
、既存のコンクリート橋脚８に適宜長穴９を穿設し、該
長穴９内に水を充填すると共に、ＡＥセンサー１０を挿
入し、目標とする計測個所付近にまで移動させておく。FIG. 3 shows an example of application of AE measurement on a bridge pier, in which an appropriate long hole 9 is bored in an existing concrete pier 8, the long hole 9 is filled with water, and an AE sensor 10 is inserted. , move it close to the target measurement point.
橋脚８にひび割れＣが入り微小破壊音が発生すると各へ
ト：センサーに１時間泊をもって伝わり受イＪ工され、
ひびｉ’：ｉれ位置が標定される。When a crack C appears in the pier 8 and a micro-destructive sound is generated, it is transmitted to each sensor within 1 hour and is detected.
Crack i': The crack position is located.
尚、図示のように橋脚の下の基礎ぐいまで穿孔してＡＬ
、センサーを導入し、同様にしてＡ Ｅ計測をすること
ができる。In addition, as shown in the diagram, drill a hole under the pier to the foundation
, a sensor can be introduced and AE measurement can be performed in the same way.
第４図は、橋脚８の検査用長穴１１の近傍に補修孔１２
を穿孔し、標定されｒこひび劃れＣを挟む位置にバンカ
ー１３をセントして、合成？、！［系の補（ｒｉｉを圧
力注入し、ひび割れＣＩ：浸透させる。FIG. 4 shows a repair hole 12 near the inspection long hole 11 of the pier 8.
Drill a hole, place bunker 13 at a position sandwiching the oriented crack C, and combine? ,! [Pressure injection of system supplement (rii) to penetrate crack CI.
数日後、再びセンサー１０により計測し、？ｌｌ修効果
を確認する。然る後、次のひび割れ位置まで補修孔１２
をモルタル１４充填し、同様の作業を繰り返す。A few days later, the sensor 10 measures again. Check the repair effect. After that, repair hole 12 is opened to the next crack position.
Fill with 14 pieces of mortar and repeat the same operation.
本発明は、コンクリート構造物であれば、一般の建築物
の他に、基礎ビヤ、橋梁、グム、トンネル、原子炉、地
下空洞等のいずれのものにも応用し、その劣化状態を調
べることができる。The present invention can be applied not only to general buildings but also to foundation buildings, bridges, tunnels, nuclear reactors, underground cavities, etc., as long as it is a concrete structure, and its deterioration state can be investigated. can.
［発明の効果１
（１）既存のコンクリート構造物の内部欠陥を遠隔捏作
によって調べることができる。[Effect of the invention 1 (1) Internal defects in existing concrete structures can be investigated by remote fabrication.
（２）ａ脚等の海や川の中の基礎構造物、建築物の基礎
ビヤ等、内部検査が非常に困難な個所でも、地上部から
穿孔し、任意の位置にセンサーを移動させて、内部欠陥
を評定することができる。(2) Even in places where internal inspection is extremely difficult, such as foundation structures in the sea or rivers such as A-legs, and foundation buildings of buildings, we can drill holes from above the ground and move the sensor to any position. Internal defects can be assessed.
（３） コンクリート構造物の耐久性診断、補修効果
の確認、断続使用の可否、使用時の警告モニター等に応
用し得る。(3) Can be applied to durability diagnosis of concrete structures, confirmation of repair effectiveness, availability of intermittent use, warning monitoring during use, etc.
第１図は本発明の一実施例を示す図、第２図は別の実施
例の図、第３図は橋脚における応用例の図、第４図は欠
陥の補（ｒＩを組み合わせた応用例の図、第５図は従来
のＡ Ｃ計測例の図である。
１・・・コンクリート構造物、２・・・長穴、３・・・
流体、４・・・栓体、５・・・ＡＥセンサー、６・・・
管体、７・・・充填材。
第４図
Ｉ
第５図
し２シ１Fig. 1 is a diagram showing one embodiment of the present invention, Fig. 2 is a diagram of another embodiment, Fig. 3 is a diagram of an application example in a bridge pier, and Fig. 4 is an application example combining defect correction (rI). , and Figure 5 are diagrams of conventional AC measurement examples. 1... Concrete structure, 2... Elongated hole, 3...
Fluid, 4... Plug body, 5... AE sensor, 6...
Pipe body, 7...filling material. Figure 4I Figure 5Shi2S1
Claims (6)
の中に水等の液体を封入すると共にＡＥセンサーを設置
して、コンクリート構造物内に発生する微小破壊音の到
達時間を測定し、その発生源を標定することを特徴とす
るコンクリート構造物におけるＡＥの計測方法。(1) Drill a long hole inside the concrete structure, fill it with liquid such as water, and install an AE sensor to measure the arrival time of the minute breaking sound generated inside the concrete structure. , a method for measuring AE in a concrete structure, characterized by locating its source.
を特徴とする前記特許請求の範囲第１項に記載のコンク
リート構造物におけるＡＥの計測方法。(2) A method for measuring AE in a concrete structure according to claim 1, characterized in that an AE sensor is movably installed in a long hole.
徴とする前記特許請求の範囲第１項または第２項に記載
のコンクリート構造物におけるＡＥの計測方法。(3) A method for measuring AE in a concrete structure according to claim 1 or 2, which comprises installing a plurality of AE sensors in a long hole.
中に鋼管等の管体を挿入して長穴との間隙に流体又は固
体の充填材を充填すると共に管体内に水等の液体を封入
し、該管体内にＡＥセンサーを設置して、コンクリート
構造物内に発生する微小破壊音の到達時間を測定し、そ
の発生源を標定することを特徴とするコンクリート構造
物におけるＡＥの計測方法。(4) Drill a long hole inside the concrete structure, insert a pipe such as a steel pipe into the hole, fill the gap between the long hole and the long hole with a fluid or solid filler, and fill the pipe with liquid such as water. AE measurement in a concrete structure, characterized in that an AE sensor is installed in the pipe to measure the arrival time of microdestructive sound generated in the concrete structure, and to locate the source of the sound. Method.
を特徴とする前記特許請求の範囲第４項に記載のコンク
リート構造物におけるＡＥの計測方法。(5) The method for measuring AE in a concrete structure according to claim 4, characterized in that the AE sensor is movably installed within the tube.
徴とする前記特許請求の範囲第４項または第５項に記載
のコンクリート構造物におけるＡＥの計測方法。(6) A method for measuring AE in a concrete structure according to claim 4 or 5, characterized in that a plurality of AE sensors are installed in a tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60225426A JPS6283654A (en) | 1985-10-09 | 1985-10-09 | Method for measuring ae in concrete structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60225426A JPS6283654A (en) | 1985-10-09 | 1985-10-09 | Method for measuring ae in concrete structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6283654A true JPS6283654A (en) | 1987-04-17 |
Family
ID=16829183
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60225426A Pending JPS6283654A (en) | 1985-10-09 | 1985-10-09 | Method for measuring ae in concrete structure |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6283654A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5457994A (en) * | 1992-11-06 | 1995-10-17 | Southwest Research Institute | Nondestructive evaluation of non-ferromagnetic materials using magnetostrictively induced acoustic/ultrasonic waves and magnetostrictively detected acoustic emissions |
| JPH08261994A (en) * | 1995-03-24 | 1996-10-11 | Tobishima Corp | Pile breakage surveying method and device used for it |
| US5581037A (en) * | 1992-11-06 | 1996-12-03 | Southwest Research Institute | Nondestructive evaluation of pipes and tubes using magnetostrictive sensors |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5290980A (en) * | 1976-01-24 | 1977-07-30 | Nippon Ii Tei Eru Kk | Method of measuring sound of dstruction of earth and rock |
| JPS577553A (en) * | 1980-06-17 | 1982-01-14 | Toda Constr Co Ltd | Measuring method for excessive stress generated in rock bed |
-
1985
- 1985-10-09 JP JP60225426A patent/JPS6283654A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5290980A (en) * | 1976-01-24 | 1977-07-30 | Nippon Ii Tei Eru Kk | Method of measuring sound of dstruction of earth and rock |
| JPS577553A (en) * | 1980-06-17 | 1982-01-14 | Toda Constr Co Ltd | Measuring method for excessive stress generated in rock bed |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5457994A (en) * | 1992-11-06 | 1995-10-17 | Southwest Research Institute | Nondestructive evaluation of non-ferromagnetic materials using magnetostrictively induced acoustic/ultrasonic waves and magnetostrictively detected acoustic emissions |
| US5581037A (en) * | 1992-11-06 | 1996-12-03 | Southwest Research Institute | Nondestructive evaluation of pipes and tubes using magnetostrictive sensors |
| JPH08261994A (en) * | 1995-03-24 | 1996-10-11 | Tobishima Corp | Pile breakage surveying method and device used for it |
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