JP3779722B1 - Anchor bolt required adhesion strength confirmation device and anchor bolt necessary adhesion strength confirmation method - Google Patents
Anchor bolt required adhesion strength confirmation device and anchor bolt necessary adhesion strength confirmation method Download PDFInfo
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Abstract
【課題】 既設アンカーボルトの必要付着耐力有無を確認するため、そのナットを緩めたり締めたりしかできない程狭い状態でも、そのアンカーボルトの必要付着耐力有無を精度よく簡単に確認できる装置および方法を提供する。
【解決手段】 使用する弾塑性体の圧縮試験を予め行い、その弾塑性変形特性を把握し、必要断面積を算定し、円筒状の弾塑性体加工品を作成する。次に、その弾塑性体加工品を再び圧縮試験し、その弾塑性変形特性を把握しておく。その弾塑性体加工品を図3の1のように既設アンカーボルトに装着し、そのアンカーボルトに引抜きが起こらない限り、その弾塑性体加工品が塑性変形に移行し予め設定された長さに達するまでこのナットを締め付け続ける。その後、このナットを緩め、その弾塑性体加工品を外し、その長さをノギス等で測定し、塑性変形量を確認することにより、必要付着耐力が有ることを確認できる装置および方法。
【選択図】 図3
PROBLEM TO BE SOLVED: To provide an apparatus and a method capable of accurately and easily confirming whether or not an anchor bolt has a required adhesion strength even in a narrow state where the nut can only be loosened or tightened in order to confirm the presence or absence of the required adhesion strength of an existing anchor bolt To do.
A compression test of an elastic-plastic body to be used is performed in advance, its elastic-plastic deformation characteristics are grasped, a necessary cross-sectional area is calculated, and a cylindrical elastic-plastic processed product is created. Next, the elasto-plastic processed product is again subjected to a compression test to grasp its elasto-plastic deformation characteristics. The elastic-plastic workpiece is attached to an existing anchor bolt as shown in 1 of FIG. 3, and the elastic-plastic workpiece is shifted to plastic deformation to a preset length unless the anchor bolt is pulled out. Continue tightening this nut until it reaches. Thereafter, an apparatus and method for confirming that the required adhesion strength can be obtained by loosening the nut, removing the elastic-plastic processed product, measuring the length with a caliper or the like, and confirming the amount of plastic deformation.
[Selection] Figure 3
Description
本発明はアンカーボルトの必要付着耐力有無を確認する装置および方法に関するものである。 The present invention relates to an apparatus and a method for confirming the presence or absence of a required adhesion strength of an anchor bolt.
アンカーボルトの必要付着耐力有無を確認するために、そのナットを締め付けた時のアンカーボルト軸力を確認する方法が利用できる。従来のボルト軸力確認方法の内、ボルトが狭い場所に設置されていても確認できる方法として、トルクレンチによる方法があるが、アンカーボルトではトルク係数値が未知数なので精度が良い測定はできない。(非特許文献1参照。)他に、超音波ボルト軸力計による方法もあるが、応力の間接的試験方法なので、精度に不安感がある。(特許文献1参照。)他に、弾性体をナットで締め付け、その弾性変形特性を利用してボルト軸力を確認する方法が有るが、弾性変形範囲のため変形量が小さく、精度が良い測定はできない。(特許文献2参照。)
特許文献2によるボルト軸力確認方法では、円筒状でかつゴムのような柔らかい加工品をナットで締め付けその弾性変形量を視認することによりボルト軸力を確認するため、ボルトの許容応力程度の大きな軸力を確認するためには不向きである。また、ボルトの許容応力程度の大きな軸力を視認するため、ゴムより圧縮強度の大きい弾性体で前記加工品を作成したとしても、その弾性変形量は小さく、ボルト軸力を視認することは困難である。また、その視認結果を検証するものが写真や記録文書以外に残らないので、試験後に確実な検証ができない。本発明はアンカーボルトの必要付着耐力を確認するため、ボルト軸力の確認精度を高め、ボルト軸力確認後に確認結果の検証品を残せるようにすることを目的とするものである。
In the method for confirming the bolt axial force according to Patent Document 2 , the bolt axial force is confirmed by tightening a cylindrical and soft workpiece such as rubber with a nut and visually confirming the amount of elastic deformation. It is not suitable for checking the axial force. Moreover, in order to visually recognize a large axial force that is about the allowable stress of the bolt, even if the processed product is made of an elastic body having a compressive strength greater than that of rubber, the amount of elastic deformation is small and it is difficult to visually recognize the bolt axial force. It is. In addition, since there is nothing other than a photograph or recorded document that verifies the visual recognition result, it cannot be reliably verified after the test. An object of the present invention is to increase the accuracy of confirmation of bolt axial force in order to confirm the required adhesion strength of anchor bolts, and to make it possible to leave a verification product of the confirmation result after confirmation of the bolt axial force.
上記目的を達成するべく本発明の請求項1によるアンカーボルト必要付着耐力確認装置は、被締結体又は構造物の面からその一部が突き出されたアンカーボルトと、上記アンカーボルトの上記突き出された部分に螺合されるナットと、上記被締結体又は構造物の面と上記ナットとの間に介挿され、円筒状をなし、上記アンカーボルトの必要付着耐力に対応する所定量だけ上記ナットを締め付けることによりノギスによる測定によって認知可能な量だけ軸方向に塑性変形するように構成されたアンカーボルト必要付着耐力確認用弾塑性体加工品と、上記アンカーボルトと上記アンカーボルト必要付着耐力確認用弾塑性体加工品との間に介挿され上記アンカーボルト必要付着耐力確認用弾塑性体加工品の位置を保持するための輪状軟質弾性体加工品と、を具備したことを特徴とするものである。
又、請求項2によるアンカーボルト必要付着耐力確認装置は、請求項1記載のアンカーボルト必要付着耐力確認装置において、上記アンカーボルト必要付着耐力確認用弾塑性体加工品の軸方向両側に平ワッシャーを装着することを特徴とするものである。
又、請求項3によるアンカーボルト必要付着耐力確認装置は、請求項1又は請求項2記載のアンカーボルト必要付着耐力確認装置において、予め設定された量だけ軸方向に弾塑性変形した後の上記アンカーボルト必要付着耐力確認用弾塑性体加工品の軸方向長さに対応した長さを一辺とする正方形断面の角棒を設け、該角棒によって上記アンカーボルト必要付着耐力確認用弾塑性体加工品の軸方向長さが所定長さになったことを確認するようにしたことを特徴とするものである。
又、請求項4によるアンカーボルト必要付着耐力確認方法は、アンカーボルトの突き出し部にアンカーボルト必要付着耐力確認用弾塑性体加工品を輪状軟質弾性体加工品を介して装着した状態でナットを取り付ける工程と、上記ナットを上記アンカーボルト必要付着耐力確認用部材が予め設定された軸方向長さになるまで締め付ける工程と、上記アンカーボルト必要付着耐力確認用弾塑性体加工品の軸方向の塑性変形量により上記アンカーボルトの必要付着耐力を確認する工程と、を具備したことを特徴とするものである。
In order to achieve the above object, an anchor bolt required adhesion strength confirmation device according to
The anchor bolt required adhesion strength confirmation device according to claim 2 is the anchor bolt required adhesion strength confirmation device according to
According to a third aspect of the present invention, there is provided the anchor bolt required adhesion strength confirmation device according to
According to a fourth aspect of the present invention, there is provided a method for confirming the required adhesion strength of an anchor bolt, wherein a nut is attached to a protruding portion of the anchor bolt while an elastic-plastic processed product for confirming the required adhesive strength of an anchor bolt is mounted via an annular soft elastic material processed product. Tightening the nut until the anchor bolt required adhesion strength confirmation member has a predetermined axial length, and axial plastic deformation of the anchor bolt necessary adhesion strength confirmation elastic-plastic product And a step of confirming the required adhesion strength of the anchor bolt according to the amount.
本発明により、ナットを緩めたり締めたりしかできない程狭い状態でも既設アンカーボルトの必要付着耐力の有無を確認することができる。 According to the present invention, it is possible to confirm the presence or absence of the required adhesion strength of the existing anchor bolt even in such a narrow state that only the nut can be loosened or tightened.
本発明により、既設アンカーボルトの必要付着耐力有無を安く量産できる前記弾塑性体加工品で確認でき、かつ、簡単な操作で確認することができる。 According to the present invention, the presence or absence of the required adhesion strength of existing anchor bolts can be confirmed with the above-mentioned elastic-plastic processed product that can be mass-produced at low cost, and can be confirmed with a simple operation.
本発明により、既設アンカーボルトの必要付着耐力有無の確認結果として塑性変形した前記弾塑性体加工品を確認結果の検証品として残せる。 According to the present invention, it is possible to leave the elasto-plastic body processed product plastically deformed as a confirmation result of the presence or absence of the required adhesion strength of the existing anchor bolt as a verification product of the confirmation result.
以下、本発明の一実施の形態について図面を参照しながら説明する。 Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
図1は本発明の前記弾塑性体加工品の正面図である。必要付着耐力有無の確認試験を行うアンカーボルトやその平ワッシャー等の材料の許容引張応力度より適度に小さい引張強度でかつ靭性が大きい弾塑性体を選定する。前記弾塑性体としてはアルミニウムA1050等が挙げられる。 FIG. 1 is a front view of the elasto-plastic processed product of the present invention. Select an elastoplastic material that has a tensile strength moderately smaller than the allowable tensile stress of the material such as anchor bolts and flat washers to be used to confirm the required adhesion strength, and that has high toughness. Examples of the elastic-plastic body include aluminum A1050.
予め、前期弾塑性体の圧縮試験を行い、その圧縮応力度−ひずみ曲線を求める。その弾塑性変形特性に基づき必要断面積を算定し、前記弾塑性体加工品の断面を決定する。前記弾塑性体加工品の断面を決定する際、前記アンカーボルト軸径より4mm程度内径を大きくする。また、平ワッシャー等は前記弾塑性体加工品の外径より4mm程度以上大きいものを使用するか作成し、前記弾塑性体加工品が弾塑性変形をした際に、前記アンカーボルトから圧迫されず、また、前記平ワッシャー等から軸力を適切に受けることができるようにする。 In advance, a compression test of the elastoplastic material is performed in advance, and a compression stress-strain curve is obtained. A necessary cross-sectional area is calculated based on the elasto-plastic deformation characteristics, and a cross-section of the elasto-plastic workpiece is determined. When determining the cross section of the elastic-plastic processed product, the inner diameter is increased by about 4 mm from the anchor bolt shaft diameter. Also, use a flat washer or the like that is larger than about 4 mm larger than the outer diameter of the elasto-plastic processed product, and when the elasto-plastic processed product undergoes elasto-plastic deformation, it will not be pressed by the anchor bolt. In addition, the axial force can be appropriately received from the flat washer or the like.
図2は前記弾塑性体加工品の側面図である。前記弾塑性体加工品の長さは5〜20mm程度で、弾塑性変形したとき局部座屈しない長さにすることが確認精度を良くするために必要である。また、短すぎると測定誤差が大きくなり、長すぎるとアンカーボルト締め付け長さが不足する。 FIG. 2 is a side view of the elasto-plastic processed product. The length of the elasto-plastic processed product is about 5 to 20 mm, and it is necessary to improve the accuracy of confirmation by making the length so as not to locally buckle when elasto-plastic deformation occurs. If it is too short, the measurement error becomes large, and if it is too long, the anchor bolt tightening length is insufficient.
前記弾塑性体加工品を作成した後、十分にその圧縮試験を行い、圧縮応力−ひずみ曲線および除圧後の塑性変形量を把握し、前記アンカーボルトの必要付着耐力に相当する力で変形する前記弾塑性加工品の弾塑性変形量および除圧後の塑性変形量を求め、前記弾塑性体加工品の弾塑性変形量を所定変形量とする。(図4参照。) After producing the elasto-plastic processed product, the compression test is sufficiently performed, the compressive stress-strain curve and the amount of plastic deformation after decompression are grasped, and deformation is performed with a force corresponding to the required adhesion strength of the anchor bolt. The elasto-plastic deformation amount of the elasto-plastic processed product and the plastic deformation amount after decompression are obtained, and the elasto-plastic deformation amount of the elasto-plastic processed product is defined as a predetermined deformation amount. (See Figure 4.)
前記所定変形量を確認するため、前記所定変形量の時の前記弾塑性体加工品の長さすなわち予め設定された長さを一辺とする正方形断面の角棒を作成しておく。 In order to confirm the predetermined deformation amount, a square bar having a square cross section with one side of the length of the elasto-plastic processed product at the predetermined deformation amount, that is, a preset length is prepared.
図3は前記弾塑性体加工品をアンカーボルトに装着した状態を示している。前記弾塑性体加工品を適正な位置に維持できるように、予め、前記アンカーボルトに輪状の軟質弾性体加工品を図3に示す位置に装着する。その後、前記弾塑性体加工品を前記平ワッシャー等で挟み、前記アンカーボルトに装着し、ナットを取り付ける。前記アンカーボルトに引抜きが起こらない限り、前記ナットを締め付け続けると、前記弾塑性体加工品は弾性変形から塑性変形に移行する。その弾塑性変形量が前記所定変形量(図4の弾塑性変形量参照。)に達するまで、すなわち前記弾塑性体加工品の長さが前記角棒の1辺長さに等しくなったことを確認するまで、前記ナットを締め付け続ける。この時、前記弾塑性体加工品の長さ確認の誤差は塑性変形のため図4に示すように圧縮応力/ひずみで示す勾配が小さく、前記弾塑性変形量に対する換算圧縮応力の誤差を小さくでき、確認精度を高めることができる。その後、前記ナットを緩め、前記弾塑性体加工品を外し、その長さをノギス等で塑性変形量を測定し、前記除圧後の塑性変形量(図4の塑性変形量参照。)と比較することにより前記弾塑性体加工品に掛かった圧縮応力が確認でき、その反力である前記アンカーボルト軸力も判明し、それと同値である前記アンカーボルトの必要付着耐力が有ることを確認できる。 FIG. 3 shows a state in which the elasto-plastic processed product is attached to an anchor bolt. A ring-shaped soft elastic body processed product is previously attached to the anchor bolt at a position shown in FIG. 3 so that the elastic-plastic processed product can be maintained at an appropriate position. Thereafter, the elasto-plastic processed product is sandwiched between the flat washers or the like, attached to the anchor bolt, and a nut is attached. Unless the anchor bolt is pulled, if the nut is continuously tightened, the elastic-plastic processed product shifts from elastic deformation to plastic deformation. That the elasto-plastic deformation amount reaches the predetermined deformation amount (see the elasto-plastic deformation amount in FIG. 4), that is, the length of the elasto-plastic workpiece is equal to one side length of the square bar. Continue tightening the nut until it is confirmed. At this time, the error in confirming the length of the elasto-plastic processed product has a small gradient indicated by compressive stress / strain as shown in FIG. 4 due to plastic deformation, and the error of the converted compressive stress relative to the amount of elasto-plastic deformation can be reduced. , Can improve the accuracy of confirmation. Thereafter, the nut is loosened, the elasto-plastic workpiece is removed, the length of the plastic deformation is measured with calipers, etc., and compared with the amount of plastic deformation after depressurization (see plastic deformation amount in FIG. 4). By doing so, the compressive stress applied to the elasto-plastic processed product can be confirmed, and the anchor bolt axial force which is the reaction force is also found, and it can be confirmed that the anchor bolt has the required adhesion strength that is equivalent to it.
本発明により、既設アンカーボルトの必要付着耐力有無を安く量産できる前記弾塑性体加工品で確認でき、かつ、簡単な操作で確認することができるため、産業上の利用可能性を有する。 According to the present invention, the presence or absence of the required adhesion strength of the existing anchor bolt can be confirmed with the above-mentioned elastic-plastic processed product that can be mass-produced at low cost, and can be confirmed with a simple operation, and thus has industrial applicability.
本発明により、既設アンカーボルトの必要付着耐力有無の確認結果として塑性変形した前記弾塑性体加工品を確認結果の検証品として残せるため、産業上の利用可能性を有する。 According to the present invention, the elasto-plastic processed product plastically deformed as a result of confirming whether or not the required anchor strength of the existing anchor bolts is present can be left as a verified product of the confirmation result, and thus has industrial applicability.
1 本発明である弾塑性体加工品
2 輪状の軟質弾性体加工品
3 平ワッシャー等
4 ナット
5 アンカーボルト
6 被締結体の面または壁や基礎の構造物の面
DESCRIPTION OF
Claims (4)
上記被締結体又は構造物の面と上記ナットとの間に介挿され、円筒状をなし、上記アンカーボルトの必要付着耐力に対応する所定量だけ上記ナットを締め付けることによりノギスによる測定によって認知可能な量だけ軸方向に塑性変形するように構成されたアンカーボルト必要付着耐力確認用弾塑性体加工品と、It is inserted between the surface of the body to be fastened or the structure and the nut, has a cylindrical shape, and can be recognized by measuring with a caliper by tightening the nut by a predetermined amount corresponding to the required adhesion strength of the anchor bolt. An anchor bolt that is configured to be plastically deformed in the axial direction by a certain amount, and an elastic-plastic processed product for confirming the required adhesion strength
上記アンカーボルトと上記アンカーボルト必要付着耐力確認用弾塑性体加工品との間に介挿され上記アンカーボルト必要付着耐力確認用弾塑性体加工品の位置を保持するための輪状軟質弾性体加工品と、A ring-shaped soft elastic body processed product that is interposed between the anchor bolt and the elastic bolt processed product for confirming the required adhesion strength of the anchor bolt and holds the position of the elastic bolt processed product for confirming the required adhesive strength of the anchor bolt. When,
を具備したことを特徴とするアンカーボルト必要付着耐力確認装置。An anchor bolt required adhesion strength confirmation device characterized by comprising:
上記アンカーボルト必要付着耐力確認用弾塑性体加工品の軸方向両側に平ワッシャーを装着することを特徴とするアンカーボルト必要付着耐力確認装置。An anchor bolt required adhesion strength confirmation device characterized by mounting flat washers on both sides in the axial direction of the elasto-plastic processed product for confirming the required adhesion strength of the anchor bolt.
予め設定された量だけ軸方向に弾塑性変形した後の上記アンカーボルト必要付着耐力確認用弾塑性体加工品の軸方向長さに対応した長さを一辺とする正方形断面の角棒を設け、A square bar having a square cross section with a length corresponding to the length in the axial direction of the elastic bolt processed product for confirming the necessary adhesion strength after the anchor bolt has been elastically plastically deformed in the axial direction by a predetermined amount,
該角棒によって上記アンカーボルト必要付着耐力確認用弾塑性体加工品の軸方向長さが所定長さになったことを確認するようにしたことを特徴とするアンカーボルト必要付着耐力確認装置。An anchor bolt required adhesion strength confirmation device characterized by confirming that the length in the axial direction of the elastic-plastic processed product for confirming the required adhesion strength of the anchor bolt has reached a predetermined length by the square bar.
上記ナットを上記アンカーボルト必要付着耐力確認用部材が予め設定された軸方向長さになるまで締め付ける工程と、Tightening the nut until the anchor bolt required adhesion strength confirmation member has a preset axial length; and
上記アンカーボルト必要付着耐力確認用弾塑性体加工品の軸方向の塑性変形量により上記アンカーボルトの必要付着耐力を確認する工程と、Confirming the required adhesion strength of the anchor bolt by the amount of plastic deformation in the axial direction of the elasto-plastic body processed product for confirming the required adhesion strength of the anchor bolt;
を具備したことを特徴とするアンカーボルト必要付着耐力確認方法。The anchor bolt required adhesion strength confirmation method characterized by comprising.
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