JPS63285466A - Sampling of corroded part for reinforcing steel - Google Patents
Sampling of corroded part for reinforcing steelInfo
- Publication number
- JPS63285466A JPS63285466A JP62122277A JP12227787A JPS63285466A JP S63285466 A JPS63285466 A JP S63285466A JP 62122277 A JP62122277 A JP 62122277A JP 12227787 A JP12227787 A JP 12227787A JP S63285466 A JPS63285466 A JP S63285466A
- Authority
- JP
- Japan
- Prior art keywords
- reinforcing steel
- mold
- matrix material
- reinforcing bars
- sampling
- 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.)
- Granted
Links
- 238000005070 sampling Methods 0.000 title claims abstract description 8
- 229910001294 Reinforcing steel Inorganic materials 0.000 title abstract description 12
- 239000011159 matrix material Substances 0.000 claims abstract description 12
- 238000000034 method Methods 0.000 claims abstract description 6
- 239000000463 material Substances 0.000 claims abstract description 5
- 229920003002 synthetic resin Polymers 0.000 claims abstract description 5
- 239000000057 synthetic resin Substances 0.000 claims abstract description 5
- 230000003014 reinforcing effect Effects 0.000 claims description 30
- 238000007711 solidification Methods 0.000 claims 1
- 230000008023 solidification Effects 0.000 claims 1
- 230000003647 oxidation Effects 0.000 abstract description 10
- 238000007254 oxidation reaction Methods 0.000 abstract description 10
- 239000004567 concrete Substances 0.000 abstract description 6
- 239000003795 chemical substances by application Substances 0.000 abstract description 3
- 125000006850 spacer group Chemical group 0.000 abstract description 3
- 238000012360 testing method Methods 0.000 abstract description 3
- 238000004088 simulation Methods 0.000 abstract 3
- 229910000831 Steel Inorganic materials 0.000 abstract 1
- 238000002347 injection Methods 0.000 abstract 1
- 239000007924 injection Substances 0.000 abstract 1
- 239000007788 liquid Substances 0.000 abstract 1
- 239000004014 plasticizer Substances 0.000 abstract 1
- 239000010959 steel Substances 0.000 abstract 1
- 230000007797 corrosion Effects 0.000 description 6
- 238000005260 corrosion Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 238000009415 formwork Methods 0.000 description 3
- 238000007689 inspection Methods 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 1
- 235000013980 iron oxide Nutrition 0.000 description 1
- VBMVTYDPPZVILR-UHFFFAOYSA-N iron(2+);oxygen(2-) Chemical class [O-2].[Fe+2] VBMVTYDPPZVILR-UHFFFAOYSA-N 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 230000001932 seasonal effect Effects 0.000 description 1
- 229920002379 silicone rubber Polymers 0.000 description 1
- 239000004945 silicone rubber Substances 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Landscapes
- Sampling And Sample Adjustment (AREA)
- Investigating And Analyzing Materials By Characteristic Methods (AREA)
Abstract
Description
【発明の詳細な説明】
〈産業上の利用分野〉
本発明は、ビルやその他の鉄筋コンクリート建造物にお
いてＪ！！！設鉄筋の腐朽度を検査するに際して行う鉄
筋腐蝕部のサンプリング方法に関する。[Detailed Description of the Invention] <Industrial Application Field> The present invention is applicable to J! ! ! This invention relates to a method for sampling corroded parts of reinforcing bars when inspecting the degree of corrosion of installed reinforcing bars.
く従来技術〉
従来、特に近年、鉄筋コンクリート建造物における埋設
鉄筋の酸化腐蝕による強度低下が間運視されるようにな
り、これに伴って関係業界においては、その現状把握の
ために試料を採取して強度を算出し、対策を検討してい
る。Previously, especially in recent years, it has become increasingly apparent that the strength of buried reinforcing bars in reinforced concrete buildings is decreasing due to oxidative corrosion.As a result, related industries have been collecting samples to understand the current situation. We are calculating the strength and considering countermeasures.
しかし、そのための初期手順としての試料採取が現実に
は最も重要でありながら容易ではなかった。However, although sample collection is the most important initial step, it has not been easy.
即ち、これまでは、先ず建造物に外観上の亀裂があるか
或は鉄鎖の色が呈色していないか、又探知器でみる時空
川音を発するか否かを予め種々の手段によって探り、腐
蝕個所が判明した時、その周辺のコンクリートを除去し
ながら鉄筋を露出させ、酸化侵蝕がある時は、なお該個
所の鉄筋について、更に周囲の錆などを充分に取り除き
、酸化の様子が良く判明できるようにして目視観察又は
酸化によって痩せた部分の外径を測定したり、更には必
要な時には切断しでサンプリングするなどしていた。That is, in the past, the first step was to use various methods to find out in advance whether there were any cracks in the exterior of the building, whether the iron chains were discolored, and whether or not the building emitted a sound that could be detected using a detector. When a corroded area is identified, the surrounding concrete is removed to expose the reinforcing steel, and if there is oxidation corrosion, the reinforcing steel at that location is thoroughly removed from surrounding rust to clearly see the oxidation state. This was done by visual observation or by measuring the outer diameter of the thinned part due to oxidation, or by cutting and sampling when necessary.
又、様子を探るだけの時は、Ｘ＃Ｘ、超音波などの照射
による非破壊検査を実施していた。Also, when just checking the situation, non-destructive inspections were conducted using X#X, ultrasonic irradiation, etc.
〈発明が解決しようとする問題点〉
しかし、上記のように酸化の進行度を目視したり、外径
を測定したり又はＸ線や超音波照射をしたりする検査は
、酸化の程度を把握するだけであって、これでは強度低
下を定量的に捉えることはできず、そして、酸化状態に
ある埋設鉄筋を切離して試料とする方法は、切離する作
業が困難であると共に、切離したとしても鉄筋を切断す
ることにより強度低下を米す虞れもあるので鉄筋自体を
サンプリングすることは好ましくないなどの欠点があっ
た。<Problems to be solved by the invention> However, the above-mentioned inspections that visually observe the degree of oxidation, measure the outer diameter, or use X-rays or ultrasonic irradiation do not allow the degree of oxidation to be ascertained. However, it is not possible to quantitatively grasp the decrease in strength, and the method of separating buried reinforcing bars that are in an oxidized state and using them as samples is difficult to perform, and the However, there is a drawback that it is not preferable to sample the reinforcing bars themselves because cutting the reinforcing bars may reduce the strength.
そこで本発明は、上記従来例のように鉄筋をサンプルと
して直接採取したりすることなく模擬サンプルとして採
取することにより酸化による腐朽度を定量的に測定可能
ならしめることを目的とする。Therefore, it is an object of the present invention to make it possible to quantitatively measure the degree of decay due to oxidation by taking a reinforcing bar as a simulated sample instead of directly taking it as a sample as in the conventional example.
く間厘点を解決するための手段〉
腐蝕鉄筋の周囲を母型材にて囲繞して固化安定させるこ
とによりモールド形成し、該モールドを用いて合成樹脂
等の塑性材によりｆ５！擬試料をイσ−るようにしてな
る。Measures to solve the problem of corrosion: A mold is formed by surrounding the corroded reinforcing steel with a matrix material to solidify and stabilize it, and using the mold, f5! is formed using a plastic material such as a synthetic resin. The pseudo sample is made to be σ-.
く作用〉
母型材が鉄筋の酸化侵蝕部の形状を忠実に再現して雌型
を形成するので、これをモールドとすることにより鉄筋
と同じ形状の模擬サンプルが得られる。Effect> Since the matrix material faithfully reproduces the shape of the oxidation-eroded part of the reinforcing bar to form a female mold, by using this as a mold, a simulated sample with the same shape as the reinforcing bar can be obtained.
〈実施例〉 以下、本発明について実施例を挙げて詳細に説明する。<Example> Hereinafter, the present invention will be described in detail by giving examples.
先ず、これまでのように鉄筋の酸化腐蝕の個所を１、？
定付けるために、コンクリート建造物の表面の亀裂や膨
らみの有無、又は鉄筋の酸化色が表面に呈色しているか
或は、槌打や超音波照射による空胴前の有無を調べる。First of all, as before, we will look at the oxidation corrosion spots on the reinforcing bars.
To determine whether there are any cracks or bulges on the surface of the concrete building, whether there is oxidized color on the surface of the reinforcing steel, or whether there is a cavity created by hammering or ultrasonic irradiation.
そして、鉄筋の酸化腐蝕個所が定まれば図示のようにそ
の部分のコンクリート１を欠除して内部の埋設鉄筋２を
露出させると共に、該鉄筋２の表面部に発生した鉄の酸
化物を化学的即ち錆取削或は機械的即ちワイヤーブラシ
などによって充分に除去し、該鉄筋２の周囲にくまなく
離型剤を塗布すると共にスペーサ５，５を介して型枠４
（合わせ型）を被せて該型枠４と鉄筋２との間隙内に速
硬性のある塑性材例えばシリコンゴムなどのような母型
材３を注入充填し、一定時間即ち母型材３が充分に固化
した時点で鉄筋２上に被せた型枠４、スペーサ５等を順
次取り外し、次いで母型材３をカッターなどによって縦
に割ることにより、予め鉄筋２の表面に塗布した離型剤
の作用で該母型材３は鉄筋表面から容易に分離する。Once the location of oxidation corrosion on the reinforcing bars is determined, as shown in the figure, the concrete 1 in that area is removed to expose the buried reinforcing bars 2, and the iron oxides generated on the surface of the reinforcing bars 2 are chemically removed. The rust is thoroughly removed by target removal or mechanically using a wire brush, etc., and a release agent is applied all over the reinforcing bars 2, and the formwork 4 is removed through spacers 5, 5.
A matrix material 3 such as a fast-hardening plastic material such as silicone rubber is injected and filled into the gap between the formwork 4 and the reinforcing bars 2 for a certain period of time, that is, the matrix material 3 is sufficiently solidified. At this point, the formwork 4, spacer 5, etc. placed on the reinforcing bars 2 are removed one after another, and then the matrix material 3 is split vertically with a cutter or the like, so that the matrix material 3 is separated by the action of the release agent applied to the surface of the reinforcing bars 2 in advance. The profile 3 is easily separated from the reinforcing bar surface.
そして、上述のように鉄筋表面から取り除いた母型材３
は割れ目を合わせて鉄筋表面を掩っていた時と同様に復
元することによりこれをモールド（割型）となし、該モ
ールドのキャビティ内に塑性のある２液性タイプの合成
樹脂、つまり速硬性があり、しかも充分な塑性を有する
合成樹脂溶液を注入し、硬化条件を一定に保つために、
例えば６０℃の温度で２０分間そのままの状態を保って
装置した後、モールド内で形成された？５！ｉサンプル
（上記モールド内に注入した樹脂の固化生成物）を該モ
ールド内から取り出して直ちに所定の強度試験機にセッ
トし、引っ張り或は圧縮等の荷重を載架することにより
強度試験を行うものである。Then, the matrix material 3 removed from the reinforcing bar surface as described above.
This is made into a mold (split mold) by aligning the cracks and restoring it in the same way as when it was covering the surface of the reinforcing steel, and inside the cavity of the mold is a plastic two-component type synthetic resin, that is, a fast-setting resin. In order to inject a synthetic resin solution with sufficient plasticity and to maintain constant curing conditions,
For example, after keeping the device as it is at a temperature of 60°C for 20 minutes, is it formed in the mold? 5! i) A sample (solidified product of the resin injected into the mold) is removed from the mold, immediately set in a specified strength testing machine, and subjected to a strength test by applying a load such as tension or compression. It is.
このようにして現場の鉄筋から直接模擬サンプルを採取
すると同時に、他方では全く酸化損傷のない状態の前記
現場の鉄筋と同じ外径、形状の鉄筋（同じ現場で損傷の
ない鉄筋から同じ要領で採取しても良い）から前記模擬
サンプルと全く同じ要領で標準サンプルを採取する。In this way, a simulated sample can be taken directly from the reinforcing bars at the site, and at the same time, on the other hand, a reinforcing bar with the same outer diameter and shape as the reinforcing bars at the site without any oxidation damage (collected in the same manner from undamaged reinforcing bars at the same site). A standard sample is collected from the standard sample in exactly the same manner as the above-mentioned simulated sample.
そして、強度測定に当たっては標準サンプルと、欠損の
ない鉄筋との間の荷重に対する相関性が予め求ゆ−られ
ており、この状態で上記模擬サンプルと標準サンプルと
の間における強度の相関性から鉄筋についての強度を間
接的に算出するものである。When measuring the strength, the correlation with respect to the load between the standard sample and the reinforcing bars without defects is determined in advance, and in this state, the correlation between the strength between the above-mentioned simulated sample and the standard sample is used to measure the strength of the reinforcing bars. This method indirectly calculates the strength of .
〈発明の効果〉
上述のように本発明は直接現場において現物をサンプリ
ングすることなく、模擬サンプルによって強度の測定を
しようとするものであるから、鉄筋を切離する作業がな
くサンプリングが容易にできる。<Effects of the Invention> As mentioned above, the present invention attempts to measure the strength using a simulated sample without directly sampling the actual product at the site, so sampling can be easily performed without the need to separate the reinforcing bars. .
又、鉄筋を切！（非破壊）しないので強度低下を招来し
ない。Also, cut the reinforcing bars! (Non-destructive), so it does not cause a decrease in strength.
そして、模擬サンプルを固化させる条件と、標準サンプ
ルを固化させる条件とを全く同じに保つ、即ち温度と時
間を同じくすることにより周囲の温度の影響や季節的変
動に関係なく正確に強度測定が可能である。By keeping the conditions for solidifying the simulated sample and the standard sample exactly the same, that is, by keeping the same temperature and time, it is possible to accurately measure strength regardless of the effects of ambient temperature or seasonal fluctuations. It is.
このように俣擬サンプルが得られることで鉄筋の強度を
定量的に測定することができるなど多くの優れた効果を
有する。Obtaining a simulated sample in this way has many excellent effects, such as being able to quantitatively measure the strength of reinforcing bars.
図面は、コンクリートｕ造物からサンプリングする様子
を示す一部切欠断面図である。
１・・・コンクリート 、２・・・鉄筋３・・・母
型材The drawing is a partially cutaway sectional view showing sampling from a concrete U structure. 1... Concrete, 2... Rebar 3... Base material
Claims (1)
固化安定させることによりモールドを形成し、該モール
ド内に合成樹脂等の塑性材を注入充填することにより模
擬試料を得ることを特徴とする鉄筋腐蝕部のサンプリン
グ方法。1. A mold is formed by surrounding the peeled and exposed corroded reinforcing bars with a matrix material to stabilize the solidification, and a simulated sample is obtained by injecting and filling the mold with a plastic material such as a synthetic resin. sampling method for corroded reinforcing bars.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62122277A JPS63285466A (en) | 1987-05-18 | 1987-05-18 | Sampling of corroded part for reinforcing steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62122277A JPS63285466A (en) | 1987-05-18 | 1987-05-18 | Sampling of corroded part for reinforcing steel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63285466A true JPS63285466A (en) | 1988-11-22 |
| JPH0519094B2 JPH0519094B2 (en) | 1993-03-15 |
Family
ID=14831981
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62122277A Granted JPS63285466A (en) | 1987-05-18 | 1987-05-18 | Sampling of corroded part for reinforcing steel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63285466A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007263924A (en) * | 2006-03-30 | 2007-10-11 | Railway Technical Res Inst | Method for estimating strength characteristics of reinforcement of existing structure |
| JP2010190739A (en) * | 2009-02-18 | 2010-09-02 | Saga Univ | Method for measuring shape of object |
| CN105973718A (en) * | 2016-03-18 | 2016-09-28 | 山东龙马重科有限公司 | Method for rapidly detecting bending strength of furan resin-sand |
| WO2017220567A1 (en) * | 2016-06-24 | 2017-12-28 | Covestro Deutschland Ag | Method for the mechanical testing of a structure formed as one part on the basis of test pieces generated by a 3d printing process |
-
1987
- 1987-05-18 JP JP62122277A patent/JPS63285466A/en active Granted
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007263924A (en) * | 2006-03-30 | 2007-10-11 | Railway Technical Res Inst | Method for estimating strength characteristics of reinforcement of existing structure |
| JP2010190739A (en) * | 2009-02-18 | 2010-09-02 | Saga Univ | Method for measuring shape of object |
| CN105973718A (en) * | 2016-03-18 | 2016-09-28 | 山东龙马重科有限公司 | Method for rapidly detecting bending strength of furan resin-sand |
| WO2017220567A1 (en) * | 2016-06-24 | 2017-12-28 | Covestro Deutschland Ag | Method for the mechanical testing of a structure formed as one part on the basis of test pieces generated by a 3d printing process |
| US11248998B2 (en) | 2016-06-24 | 2022-02-15 | Covestro Deutschland Ag | Method for the mechanical testing of a structure formed as one part on the basis of test pieces generated by a 3D printing process |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0519094B2 (en) | 1993-03-15 |
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