JP2003177087A - Method for estimating deterioration in strength of alc panel - Google Patents
Method for estimating deterioration in strength of alc panelInfo
- Publication number
- JP2003177087A JP2003177087A JP2001377388A JP2001377388A JP2003177087A JP 2003177087 A JP2003177087 A JP 2003177087A JP 2001377388 A JP2001377388 A JP 2001377388A JP 2001377388 A JP2001377388 A JP 2001377388A JP 2003177087 A JP2003177087 A JP 2003177087A
- Authority
- JP
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- Prior art keywords
- screw
- degree
- carbonation
- alc panel
- strength
- 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.)
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Landscapes
- Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)
Abstract
Description
【発明の詳細な説明】
【0001】
【発明の属する技術分野】本発明は、建築物の壁や屋
根、床などに使用されるALCパネル(軽量気泡コンク
リートパネル)の炭酸化による強度の劣化度(耐久性)
を推定する方法に関する。
【0002】
【従来の技術】ALCパネルは、珪石等の珪酸質原料
と、セメントや生石灰等の石灰質原料を主原料とし、こ
れらの微粉末に水とアルミニウム粉末等の添加物を加え
て、スラリー状とした後、補強用鉄筋を配置した型枠内
に流し込み、アルミニウム粉末の反応により発砲させ、
石灰質原料の反応により半硬化させて、所定寸法に形成
した後、オートクレーブによる高温高圧水蒸気養生を行
って製造される。このALCパネルは、絶乾かさ比重
0.5程度の軽量で、耐久性、断熱性、施工性に優れて
いるため、建築材料として広く使用されている。
【0003】ALCパネルの耐久性は、ヒビ割れの発生
や、パネル強度の低下により劣化したと判断されるが、
このALCパネルの耐久性が劣化する要因としては、外
的な要因と内的な要因に大別され、このうち内的な要因
としては凍害、塩害、炭酸化、乾燥収縮等が考えられ
る。この内的な要因の中で炭酸化とは、ALCの主要鉱
物であるトバモライトが、炭酸ガスと水分が存在する環
境下で、シリカゲルと炭酸カルシウムに分解する反応で
あり、仕上げ等の施工が適切に施された場合にも、徐々
に進行することが知られている。また、炭酸化すること
によりALCパネルは収縮(炭酸化収縮)し、さらに炭
酸化したALCパネルは乾燥収縮率が大きくなり、乾燥
収縮と湿潤膨張の繰返しによるひび割れの発生やパネル
強度の低下につながることが懸念される。
【0004】従来、ALCパネルの炭酸化による劣化程
度の推定方法として、ALCパネルの酸化カルシウム含
有量と炭酸ガス含有量を測定し、その測定値に基づいて
劣化程度を推定する方法が知られている(特開2000
−180437参照)。この方法は、当該ALCパネル
の全カルシウム分を定量するために、全酸化カルシウム
含有量を測定する化学分析を行い、また、当該ALCパ
ネルの炭酸カルシウム分を定量するために、炭酸ガス含
有量を測定する熱分析を行い、(炭酸ガス含有量×56
/44)/(全酸化カルシウム含有量)×100なる式
で炭酸化度を算出し、その値から劣化程度を推定する方
法である。ここで、化学分析は、例えばICP−AES
(誘導結合プラズマ原子分光分析)を行い、熱分析は、
例えばDTA−TG(示差熱天秤による熱分析)を行
う。
【0005】また、パネル強度からALCパネルの劣化
程度を推定する方法として、パネル自体からブロック塊
を切り出して圧縮強度等の物性値を測定する方法や、パ
ネル自体を取外し直接曲げ試験等の実物大試験により曲
げ強度を測定する方法により得られた値に基づいて劣化
程度を推定する方法がある。
【0006】
【発明が解決しようとする課題】しかしながら、上記し
た従来のALCパネル劣化程度の推定方法には、以下に
記載する問題点があった。ICP−AES(誘導結合プ
ラズマ原子分光分析)、DTA−TG(示差熱天秤によ
る熱分析)等により当該パネルの炭酸化度を測定し、そ
の測定値に基づいて劣化程度を推定する方法は、パネル
の炭酸化度の測定に比較的時間がかかる欠点がある。ま
た、パネルからブロック塊を切出し強度等の物性値を測
定したり、パネルそのものを建物から取外し、曲げ強度
を測定する等の方法は、いずれも大掛かりな方法であ
り、劣化程度の推定に多くの手間と時間を要するのみな
らず、建築物所有者にとっても大きな負担を強いられる
という問題があった。
【0007】本発明は、上記した従来の問題点を解決す
るためになされたもので、建物の現場で炭酸化による強
度劣化程度を簡易迅速に推定することができ、かつ建築
物所有者の負荷を可及的に少なくし得るALCパネルの
強度劣化推定方法を提案することを目的とするものであ
る。
【0008】
【課題を解決するための手段】本発明者らは、上記した
従来の問題を解決するために種々検討を重ねた結果、既
存建築物のALCパネルの炭酸化度と圧縮強度およびス
クリューネジの最大締付けトルクの間に強い相関がある
ことを知見し、既存の建築物のALCパネルに対して、
直径約4〜7mmのスクリューネジを取り付ける際の締
付けトルクを測定するだけで、炭酸化による強度の劣化
程度が容易に推定でき、かつ測定後はスクリューネジを
取り除き、直径約4〜7mmの穴を補修するだけで、既
存の建築物に調査のための負荷がほとんどかからないA
LCパネルの炭酸化による強度劣化程度を推定する方法
を見出した。すなわち、本発明に係るALCパネルの劣
化度推定方法は、トルク測定が可能な電動またはエアー
駆動式のドライバーと、同一軸線上にスクリューネジを
緩貫通し得る通孔を有する下部ハウジングおよび上部ハ
ウジングを軸受けを介して相互に回動自在に相重ねて一
体に設け、かつ上部ハウジングの通孔開口部に、スクリ
ューネジの頭部を受けるラッパ状凹部を有するトルク測
定用治具を用い、ALCパネル表面に前記トルク測定用
治具を設置した状態で当該治具の通孔にスクリューネジ
をセットし、該スクリューネジを前記ドライバーにてね
じ込み、当該スクリューネジが空転する直前の最大トル
ク値を測定し、その最大トルク値と炭酸化度からALC
パネルの炭酸化による強度劣化程度を推定することを特
徴とするものである。
【0009】本発明におけるスクリューネジは、特に限
定するものではないが、直径約4〜7mmのものが適当
である。また、トルク測定が可能な電動またはエアー駆
動式のドライバーは、既存のものを使用することができ
る。例えば、電動またはエアー駆動式のドライバーに出
力装置(記録装置)を接続したものを用いる。トルク測
定用治具は、スクリューネジを空転させる機構を備え、
かつALCパネルの表面に対して直角にスクリューネジ
を保持してトルク測定ができると共に、測定後もネジ穴
を大きくすることなく垂直にかつ容易にスクリューネジ
を取り除くことが可能となっている。具体的には、軸受
を介して相互に回動自在に一体化した下部ハウジングお
よび上部ハウジングとからなり、上下ハウジングに緩貫
通したスクリューネジが前記ドライバーにて締め付けら
れても、さらにスクリューネジが回転(空転)すること
が可能となして、当該スクリューネジが空転する直前の
最大トルク値を測定できるようになっている。本発明で
は、この最大トルク値と、前記した公知の方法で予め算
出したALCパネルの炭酸化度からALCパネルの炭酸
化による強度劣化程度を推定する。
【0010】なお、ALCパネルの炭酸化度は、前記し
たICP−AES(誘導結合プラズマ原子分光分析)、
DTA−TG(示差熱天秤による熱分析)により測定す
ることができる。すなわち、当該ALCパネルの全カル
シウム分を定量するために、ICP−AESにより全酸
化カルシウム含有量を測定し、また、当該ALCパネル
の炭酸カルシウム分を定量するために、DTA−TGに
より炭酸ガス含有量を測定し、(炭酸ガス含有量×56
/44)/(全酸化カルシウム含有量)×100なる式
で炭酸化度を算出する。
【0011】
【発明の実施の形態】図1は本発明のALCパネルの強
度劣化推定方法を実施するための装置構成を示す概略
図、図2は同上装置のトルク測定用治具を拡大して示す
概略縦断面図であり、11はALCパネル、12はトル
ク測定用治具、13は動力式ドライバー、14は出力装
置、15はスクリューネジである。
【0012】すなわち、本発明方法を実施するための装
置は、ALCパネル11にスクリューネジ15を保持し
て空転させるためのトルク測定用治具12、トルク測定
用治具に保持されたスクリューネジ15を締め付ける動
力式ドライバー13および、該ドライバーに接続された
出力装置14とから構成され、ALCパネル11に締め
付けられたスクリューネジ15が空転する直前の最大ト
ルク値を測定する出力装置14とから構成される。トル
ク測定用治具12は、図2に拡大して示すように、中心
にスクリューネジ15を緩貫通し得る通孔12−1aと
スクリューネジ15の頭部15−1を受けるラッパ状凹
部12−1bを有する上部ハウジング12−1と、前記
通孔12−1aと同一中心線上にスクリューネジ15を
緩貫通し得る通孔12−2aを有する下部ハウジング1
2−2が軸受12−3を介して相互に回動自在に相重ね
られて一体化され、上部ハウジング12−1および下部
ハウジング12−2の通孔12−1a、12−2aに緩
貫通したスクリューネジ15が前記ドライバー13にて
締め付けられても、さらにスクリューネジが回転(空
転)することが可能な構造となしている。
【0013】上記構成の装置によりALCパネルの強度
劣化を推定する場合は、当該ALCパネル11の表面に
前記トルク測定用治具12を設置した状態で当該治具の
通孔通孔12−1a、12−2aにスクリューネジ15
をセットし、該スクリューネジ15を前記ドライバー1
3にてねじ込む。この時のトルク値は、ドライバー13
に接続された出力装置14により記録される。この出力
装置14により、当該スクリューネジ15が空転する直
前の最大トルク値を測定し、その最大トルク値と、予め
求めた炭酸化度から当該ALCパネル11の炭酸化によ
る強度劣化程度を推定する。
【0014】図3は上記装置を用いて求めた実際の建物
のALCパネルの最大トルク値と炭酸化度の関係を示し
たものである。使用したスクリューネジは、直径約4m
mで、ドライバー13は電動式のものを用いた。炭酸化
度は、前記したICP−AES(誘導結合プラズマ原子
分光分析)、DTA−TG(示差熱天秤による熱分析)
により測定した。なお、測定後はスクリューネジを取り
除き、直径約4mmの穴を補修した。この図3に示すデ
ータから明らかなごとく、スクリューネジの最大締付け
トルクによってALCパネルの炭酸化による強度劣化程
度を推定することができる。
【0015】
【発明の効果】以上説明したごとく、本発明方法によれ
ば、ALCパネルに対して、直径約4〜7mm程度のス
クリューネジをねじ込む際の最大締付けトルクを測定す
るだけでALCパネルの炭酸化による強度劣化程度を推
定することができるので、建物の現場で炭酸化による強
度劣化程度を簡易迅速に推定することができ、また測定
後はスクリューネジを取り除き、そのねじ穴を補修する
だけで済むので、既存の建築物に対しては調査のための
負荷をほとんどかけずにALCパネルの炭酸化による強
度劣化程度を推定することができるという顕著な効果を
奏する。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a degree of deterioration of strength due to carbonation of ALC panels (lightweight cellular concrete panels) used for walls, roofs, floors and the like of buildings. (durability)
And a method for estimating. 2. Description of the Related Art An ALC panel is mainly composed of a siliceous raw material such as silica stone and a calcareous raw material such as cement and quick lime, and water, aluminum powder and other additives are added to these fine powders to form a slurry. After that, it is poured into the formwork in which the reinforcing steel bars are arranged, and fired by the reaction of the aluminum powder,
It is semi-cured by the reaction of calcareous raw materials, formed into a predetermined size, and then subjected to high-temperature and high-pressure steam curing using an autoclave. This ALC panel is widely used as a building material because it is lightweight with an absolute dryness specific gravity of about 0.5, and has excellent durability, heat insulation properties, and workability. [0003] The durability of the ALC panel is judged to have deteriorated due to the occurrence of cracks and a decrease in panel strength.
Factors that deteriorate the durability of the ALC panel are roughly classified into external factors and internal factors. Among these factors, internal factors include frost damage, salt damage, carbonation, drying shrinkage, and the like. Among these internal factors, carbonation is a reaction in which tobermorite, a main mineral of ALC, is decomposed into silica gel and calcium carbonate in an environment where carbon dioxide gas and moisture are present. It is known that even when applied to a subject, it gradually progresses. In addition, the carbonation causes the ALC panel to contract (carbonation contraction), and the carbonized ALC panel increases in dry shrinkage, leading to cracks and reduced panel strength due to repeated drying shrinkage and wet expansion. It is concerned. Conventionally, as a method of estimating the degree of deterioration of an ALC panel due to carbonation, a method of measuring the calcium oxide content and the carbon dioxide gas content of an ALC panel and estimating the degree of deterioration based on the measured values is known. (Japanese Patent Laid-Open 2000
-180437). This method performs a chemical analysis to measure the total calcium oxide content in order to determine the total calcium content of the ALC panel, and the carbon dioxide gas content in order to determine the calcium carbonate content in the ALC panel. A thermal analysis for measurement was performed,
/ 44) / (total calcium oxide content) × 100 is a method of calculating the degree of carbonation and estimating the degree of deterioration from the value. Here, the chemical analysis is performed, for example, by ICP-AES.
(Inductively coupled plasma atomic spectroscopy) and thermal analysis
For example, DTA-TG (thermal analysis using a differential thermal balance) is performed. Further, as a method of estimating the degree of deterioration of the ALC panel from the panel strength, a method of measuring physical properties such as compressive strength by cutting out a block block from the panel itself, or a method of removing the panel itself and performing a direct bending test or the like. There is a method of estimating the degree of deterioration based on a value obtained by a method of measuring bending strength by a test. [0006] However, the above-mentioned conventional method for estimating the degree of deterioration of the ALC panel has the following problems. The method of measuring the degree of carbonation of the panel by ICP-AES (inductively coupled plasma atomic spectroscopy), DTA-TG (thermal analysis using a differential thermal balance), or the like, and estimating the degree of deterioration based on the measured value is described in Panel Has the disadvantage that it takes a relatively long time to measure the degree of carbonation. Also, methods such as cutting out a block block from a panel and measuring physical properties such as strength, and removing the panel itself from a building and measuring bending strength are all large-scale methods. There is a problem that not only is time and labor required, but also a great burden is imposed on the building owner. SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and it is possible to easily and quickly estimate the degree of strength deterioration due to carbonation at a building site, and to reduce the burden on the building owner. It is an object of the present invention to propose a method of estimating the strength deterioration of an ALC panel which can reduce the intensity as much as possible. The present inventors have made various studies to solve the above-mentioned conventional problems, and as a result, have found that the degree of carbonation and compressive strength of the ALC panel of an existing building and the screw strength have been improved. We found that there was a strong correlation between the maximum tightening torque of the screws, and for existing building ALC panels,
Only by measuring the tightening torque when attaching a screw screw having a diameter of about 4 to 7 mm, the degree of deterioration in strength due to carbonation can be easily estimated, and after the measurement, the screw screw is removed and a hole having a diameter of about 4 to 7 mm is removed. A: The existing building is hardly surveyed by repairing.
A method for estimating the degree of strength deterioration due to carbonation of an LC panel was found. That is, the method for estimating the degree of deterioration of an ALC panel according to the present invention includes an electric or air-driven driver capable of measuring torque, a lower housing and an upper housing having through holes that can pass through screw screws on the same axis. Using a torque measuring jig having a trumpet-shaped recess for receiving the head of a screw screw at the opening of the through hole of the upper housing, and using a torque measuring jig, In the state where the torque measuring jig is installed, a screw screw is set in the through hole of the jig, the screw screw is screwed with the screwdriver, and the maximum torque value immediately before the screw screw idles is measured, ALC from its maximum torque value and degree of carbonation
It is characterized by estimating the degree of strength deterioration due to carbonation of the panel. The screw in the present invention is not particularly limited, but a screw having a diameter of about 4 to 7 mm is suitable. An existing electric or pneumatic driver capable of measuring torque can be used. For example, a driver in which an output device (recording device) is connected to an electric or air-driven driver is used. The jig for torque measurement has a mechanism to idle the screw screw,
In addition, the torque can be measured while holding the screw at right angles to the surface of the ALC panel, and the screw can be removed vertically and easily after the measurement without increasing the screw hole. More specifically, the lower and upper housings are rotatably integrated with each other via a bearing. Even if the screw is loosely screwed into the upper and lower housings by the screwdriver, the screw further rotates. (I.e., idle) so that the maximum torque value immediately before the screw screw idles can be measured. In the present invention, the degree of strength deterioration due to carbonation of the ALC panel is estimated from the maximum torque value and the degree of carbonation of the ALC panel previously calculated by the above-described known method. The degree of carbonation of the ALC panel is determined by the above-mentioned ICP-AES (inductively coupled plasma atomic spectroscopy),
It can be measured by DTA-TG (thermal analysis using a differential thermal balance). That is, in order to determine the total calcium content of the ALC panel, the total calcium oxide content was measured by ICP-AES, and in order to quantify the calcium carbonate content of the ALC panel, the carbon dioxide content was measured by DTA-TG. The amount was measured and (carbon dioxide content x 56
/ 44) / (total calcium oxide content) × 100 to calculate the degree of carbonation. FIG. 1 is a schematic view showing the structure of an apparatus for carrying out a method for estimating the strength deterioration of an ALC panel according to the present invention. FIG. 2 is an enlarged view of a torque measuring jig of the same apparatus. 1 is a schematic longitudinal sectional view showing an ALC panel, 11 a torque measuring jig, 13 a power driver, 14 an output device, and 15 a screw screw. That is, the apparatus for carrying out the method of the present invention comprises a torque measuring jig 12 for holding a screw screw 15 on an ALC panel 11 and causing the screw screw 15 to spin, and a screw screw 15 held by the torque measuring jig. And an output device 14 for measuring the maximum torque value immediately before the screw screw 15 fastened to the ALC panel 11 idles. You. As shown in FIG. 2 in an enlarged manner, the torque measuring jig 12 has a through hole 12-1a at the center thereof through which the screw screw 15 can be slowly penetrated, and a trumpet-shaped recess 12- which receives the head 15-1 of the screw screw 15. 1b, and a lower housing 1 having a through hole 12-2a through which the screw screw 15 can be slowly penetrated on the same center line as the through hole 12-1a.
2-2 are rotatably overlapped with each other via a bearing 12-3, and are integrated, and loosely penetrate through the through holes 12-1a and 12-2a of the upper housing 12-1 and the lower housing 12-2. Even if the screw screw 15 is tightened by the driver 13, the screw screw can be further rotated (idle). When estimating the deterioration of the strength of the ALC panel by the apparatus having the above structure, the torque measuring jig 12 is installed on the surface of the ALC panel 11 and the through holes 12-1a, 12-2a with screw screw 15
And screw the screw 15 to the screwdriver 1
Screw in 3. The torque value at this time is
Is recorded by the output device 14 connected to the. The output device 14 measures the maximum torque value immediately before the screw screw 15 idles, and estimates the degree of strength deterioration due to carbonation of the ALC panel 11 from the maximum torque value and a previously determined degree of carbonation. FIG. 3 shows the relationship between the maximum torque value of the ALC panel of the actual building and the degree of carbonation obtained by using the above apparatus. The screw used is about 4m in diameter
m, an electric driver 13 was used. The degree of carbonation is determined by the above-mentioned ICP-AES (inductively coupled plasma atomic spectroscopy) and DTA-TG (thermal analysis using a differential thermobalance).
Was measured by After the measurement, the screw was removed, and a hole having a diameter of about 4 mm was repaired. As is clear from the data shown in FIG. 3, the degree of strength deterioration due to carbonation of the ALC panel can be estimated from the maximum tightening torque of the screw. As described above, according to the method of the present invention, the measurement of the maximum tightening torque when screwing a screw having a diameter of about 4 to 7 mm into the ALC panel is performed only by measuring the maximum tightening torque. Since the degree of strength deterioration due to carbonation can be estimated, the degree of strength deterioration due to carbonation can be easily and quickly estimated at the building site, and after measurement, screw screws are removed and the screw holes are simply repaired Therefore, it is possible to estimate the degree of strength deterioration of the existing building due to carbonation of the ALC panel with almost no load on the existing building.
【図面の簡単な説明】
【図1】本発明のALCパネルの強度劣化推定方法を実
施するための装置構成を示す概略図である。
【図2】同上装置のトルク測定用治具を拡大して示す概
略縦断面図である。
【図3】本発明法により求めた実際の建物のALCパネ
ルの最大トルク値と炭酸化度の関係を示す図である。
【符号の説明】
11 ALCパネル
12 トルク測定用治具
12−1 上部ハウジング
12−2 下部ハウジング
12−1a、12−2a 通孔
12−1b ラッパ状凹部
13 ドライバー
14 出力装置
15 スクリューネジBRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram showing an apparatus configuration for implementing a method for estimating the strength deterioration of an ALC panel according to the present invention. FIG. 2 is a schematic longitudinal sectional view showing a torque measuring jig of the above device in an enlarged manner. FIG. 3 is a diagram showing a relationship between a maximum torque value of an ALC panel of an actual building and a degree of carbonation obtained by the method of the present invention. [Description of Signs] 11 ALC panel 12 Jig for torque measurement 12-1 Upper housing 12-2 Lower housing 12-1a, 12-2a Through-hole 12-1b Trunk-shaped recess 13 Driver 14 Output device 15 Screw screw
Claims (1)
動式のドライバーと、同一軸線上にスクリューネジを緩
貫通し得る通孔を有する下部ハウジングおよび上部ハウ
ジングを軸受けを介して相互に回動自在に相重ねて一体
に設け、かつ上部ハウジングの通孔開口部に、スクリュ
ーネジの頭部を受けるラッパ状凹部を有するトルク測定
用治具を用い、ALCパネル表面に前記トルク測定用治
具を設置した状態で当該治具の通孔にスクリューネジを
セットし、該スクリューネジを前記ドライバーにてねじ
込み、当該スクリューネジが空転する直前の最大トルク
値を測定し、その最大トルク値と炭酸化度からALCパ
ネルの炭酸化による強度劣化程度を推定することを特徴
とするALCパネルの強度劣化推定方法。Claims 1. An electric or pneumatic driver capable of measuring torque and a lower housing and an upper housing having through holes through which a screw screw can be slowly penetrated on the same axis via a bearing. The torque measurement jig is provided on the ALC panel surface by using a torque measurement jig having a trumpet-shaped recess for receiving the head of a screw screw at the opening of the through hole of the upper housing and integrally provided so as to be mutually rotatable. In the state where the jig is installed, a screw screw is set in the through hole of the jig, the screw screw is screwed in with the screwdriver, the maximum torque value immediately before the screw screw idles is measured, and the maximum torque value is measured. A method for estimating the degree of strength deterioration of the ALC panel due to carbonation from the carbonation degree and the degree of carbonation.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2001377388A JP2003177087A (en) | 2001-12-11 | 2001-12-11 | Method for estimating deterioration in strength of alc panel |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2001377388A JP2003177087A (en) | 2001-12-11 | 2001-12-11 | Method for estimating deterioration in strength of alc panel |
Publications (1)
Publication Number | Publication Date |
---|---|
JP2003177087A true JP2003177087A (en) | 2003-06-27 |
Family
ID=19185369
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2001377388A Pending JP2003177087A (en) | 2001-12-11 | 2001-12-11 | Method for estimating deterioration in strength of alc panel |
Country Status (1)
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JP (1) | JP2003177087A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2011196817A (en) * | 2010-03-19 | 2011-10-06 | Sekisui House Ltd | Behavior reproduction device of joint part, and behavior reproduction method of joint part |
CN108225887A (en) * | 2017-12-14 | 2018-06-29 | 中国特种飞行器研究所 | Bolt class standard part corrosion detecting method |
-
2001
- 2001-12-11 JP JP2001377388A patent/JP2003177087A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2011196817A (en) * | 2010-03-19 | 2011-10-06 | Sekisui House Ltd | Behavior reproduction device of joint part, and behavior reproduction method of joint part |
CN108225887A (en) * | 2017-12-14 | 2018-06-29 | 中国特种飞行器研究所 | Bolt class standard part corrosion detecting method |
CN108225887B (en) * | 2017-12-14 | 2020-09-22 | 中国特种飞行器研究所 | Corrosion detection method for bolt standard parts |
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