JPH09189694A - Method for testing strength of concrete - Google Patents
Method for testing strength of concreteInfo
- Publication number
- JPH09189694A JPH09189694A JP1944796A JP1944796A JPH09189694A JP H09189694 A JPH09189694 A JP H09189694A JP 1944796 A JP1944796 A JP 1944796A JP 1944796 A JP1944796 A JP 1944796A JP H09189694 A JPH09189694 A JP H09189694A
- Authority
- JP
- Japan
- Prior art keywords
- concrete
- strength
- rod
- groove
- pull
- 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
- On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、硬化したコンクリ
ートに埋め込んだ引抜棒材を、コンクリート表面上で引
抜棒材と同心の円筒体に反力を支持させて引き抜き、コ
ンクリートをコーン状に剪断破壊させてその剪断強度か
らコンクリートの圧縮強度を求める場合の強度試験方法
に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of pulling a drawn bar material embedded in hardened concrete by supporting a reaction force on a cylindrical body concentric with the drawn bar material on the surface of the concrete, and shearing the concrete into a cone shape. The present invention relates to a strength test method for obtaining the compressive strength of concrete from the shear strength.
【０００２】[0002]
【従来の技術】コンクリートは他の構造材料とは異な
り、製造過程の多くの部分が工事現場における手作業に
委ねられていることや、強度が、調合の違いだけではな
く、同一バッチのフレッシュコンクリートから作った場
合でも、締め固め程度などによって異なるために、個々
の現場での強度試験が要求されている。2. Description of the Prior Art Concrete is different from other structural materials in that much of the manufacturing process is left to manual work at the construction site, and the strength is not only due to the difference in the mix, but also the same batch of fresh concrete. Even if made from, it depends on the degree of compaction, etc., so strength tests at individual sites are required.
【０００３】ところが、コンクリートの圧縮試験は試験
装置が大がかりとなるため、実験室以外で行うのは困難
であった。そこで、コンクリートの圧縮強度を現場にお
いて簡易な装置で調べることのできる方法として、引抜
試験によってコンクリートの圧縮強度を推定する方法が
一般的に用いられている。However, it is difficult to carry out a compression test of concrete in a place other than a laboratory because the test equipment is large. Therefore, a method of estimating the compressive strength of concrete by a pull-out test is generally used as a method of examining the compressive strength of concrete with a simple device on site.
【０００４】この引抜試験は、図４（Ａ）に示すように
予め引抜棒材９１を設置した基盤９０上にフレッシュコ
ンクリートを吹き付けて図４（Ｂ）のように成層し、コ
ンクリート９２が硬化した後、コンクリート９２の表面
を平らに整形し、図４（Ｃ）のように引抜棒材９１と同
心に設置した円筒体９３をコンクリート９２の表面上に
押さえ付けることによって反力を支持させながら、引抜
棒材９１を引き抜いてコンクリート９２をコーン形９５
に剪断破壊させる、というものであり、特公昭５７−１
８１２５号、特公平６−７６９５５号公報等に開示され
ている。In this pull-out test, as shown in FIG. 4 (A), fresh concrete was sprayed on a base 90 on which a pull-out rod 91 was previously installed, and layered as shown in FIG. 4 (B) to harden the concrete 92. After that, while shaping the surface of the concrete 92 flat and pressing the cylindrical body 93 installed concentrically with the pulling rod 91 as shown in FIG. 4 (C) on the surface of the concrete 92, the reaction force is supported, Pull out the pull-out rod 91 to make the concrete 92 a cone-shaped 95
It is said that the material is sheared and destroyed.
No. 8125 and Japanese Patent Publication No. 6-76955.
【０００５】そして、そのときの破壊荷重を剪断面の面
積で除して求めた剪断強度の値を、予め過去の実験から
得た実験式に代入することによって、コンクリートの圧
縮強度が推定されるのである。Then, the compressive strength of concrete is estimated by substituting the value of the shear strength obtained by dividing the breaking load at that time by the area of the shear plane into the empirical formula obtained from the past experiment in advance. Of.
【０００６】[0006]
【発明が解決しようとする課題】ところが、この方法に
よると、コンクリートを打設する前に予め引抜棒材を埋
め込まなければならないため、引抜棒材を設置せずにコ
ンクリートを吹き付けた場合には強度を調べることが不
可能であり、また、コンクリート硬化後に任意の場所の
強度を調べることができなかった。However, according to this method, since the pull-out rod must be embedded in advance before placing the concrete, when the concrete is sprayed without installing the pull-out rod, the strength is increased. It was impossible to examine the strength of the concrete, and it was not possible to examine the strength at any place after hardening of the concrete.
【０００７】加えて、従来の方法では、引抜棒材とコン
クリートとの定着が不十分な場合があり、そのときに
は、引き抜き時の応力が一部分に集中するため、測定精
度が悪くなるという問題を有していた。In addition, in the conventional method, there is a case where the pulling rod and the concrete are not firmly fixed to each other. At that time, the stress at the time of pulling is concentrated in a part, which causes a problem that the measurement accuracy is deteriorated. Was.
【０００８】更に、引抜棒材の基端部にコンクリートが
付着するのを防ぐために、基端部にキャップ等を取り付
けてマスキングをしなければならず、余計な手間がかか
っていた。Furthermore, in order to prevent concrete from adhering to the base end of the drawn bar, it is necessary to attach a cap or the like to the base end for masking, which is an extra task.
【０００９】[0009]
【課題を解決するための手段】そこで、本発明は、硬化
後のコンクリートの任意個所に底部が拡大された取付孔
を形成し、メカニカルアンカ式の引抜棒材を挿入してそ
の先端を拡大孔部内で拡開させるとともに、取付孔と引
抜棒材との空隙に充填した接着剤を硬化させて引抜棒材
をコンクリートに固定し、次いでコンクリート表面上の
引抜棒材と同心となる円上に配置した円筒体に反力を支
持させて引抜棒材を引き抜き、コンクリートがコーン状
に剪断破壊されるときの剪断強度を用いてコンクリート
の圧縮強度を求めることとした。SUMMARY OF THE INVENTION Therefore, according to the present invention, a mounting hole having an enlarged bottom is formed at an arbitrary place of hardened concrete, and a mechanical anchor type pulling rod member is inserted and the tip thereof is enlarged. While expanding the inside of the section, cure the adhesive filled in the gap between the mounting hole and the drawing bar material to fix the drawing bar material to concrete, and then place it on a circle that is concentric with the drawing bar material on the concrete surface It was decided that the compressive strength of the concrete should be determined by using the shear strength when the concrete is sheared and broken into cones by supporting the reaction force of the cylindrical body and supporting the reaction force.
【００１０】この方法によると、硬化後のコンクリート
の任意の場所で引抜試験を行うことができるうえ、引抜
棒材先端の拡開部片が拡大孔部の孔壁に喰い付くために
引抜部材だけが滑って抜けることがなく、更に接着剤に
よって引抜棒材が孔壁に均一に付着されるため、応力が
均等にかかり、正確な引抜試験を行うことができる。According to this method, the pull-out test can be carried out at any place on the concrete after hardening, and since the expansion piece at the tip of the extraction rod bites the hole wall of the expansion hole, only the extraction member is used. Does not slip off and the pull-out bar is evenly attached to the hole wall by the adhesive, so that stress is evenly applied and an accurate pull-out test can be performed.
【００１１】また、引抜棒材を中心とする円上に、底面
が引抜棒材と直角となる溝を設け、その溝に円筒体を嵌
め込むようにすると、引抜角度や引抜高さがより正確に
確保されるうえ、コンクリート表面が平坦でない場合に
も反力を円筒体全周で均等に支持させることができ、更
に正確な引抜試験が期待される。Further, if a groove whose bottom surface is perpendicular to the drawing bar is provided on a circle centered on the drawing bar and the cylinder is fitted in the groove, the drawing angle and the drawing height are more accurate. In addition, the reaction force can be supported evenly on the entire circumference of the cylinder even if the concrete surface is not flat, and a more accurate pull-out test is expected.
【００１２】そして、中心にドリル刃を有し、その刃の
周囲に同心に配置したドラムの先端縁に切削刃を形成し
たドラム刃を有する切削工具を用いて、引抜棒材の取付
孔の下穴と円筒体を嵌め込む溝とを同時に形成するよう
にすれば、容易に取付孔と同心の溝を成形することがで
き、更にそのドリル刃を拡底穿孔用のものとすれば、取
付孔と溝とが一工程で形成され、工程が一層簡略化され
る。Then, using a cutting tool having a drill blade at the center and a drum blade having a cutting blade formed at the tip edge of a drum concentrically arranged around the blade, If the hole and the groove into which the cylindrical body is fitted are formed at the same time, a groove concentric with the mounting hole can be easily formed. The groove and the groove are formed in one step, which further simplifies the step.
【００１３】加えて、引抜棒材の外周表面に凹凸を設け
ることによって、接着剤の付着がよくなり、従って、よ
り強固にコンクリートと一体化される。In addition, by providing irregularities on the outer peripheral surface of the drawn bar, the adhesion of the adhesive is improved, and therefore, it is more firmly integrated with the concrete.
【００１４】[0014]
【発明の実施の形態】次に、本発明の実施の形態を図面
に基づいて説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings.
【００１５】図１は本発明で用いられる引抜棒材１の一
例であり、軸材２とスリーブ３とから構成されている。
軸材２は先端部２１が先端方向に向けて径が大きくなる
円錐台形をしており、基端部には雄ねじ部２２が設けら
れている。また、スリーブ３は軸材２の基端から嵌め込
んで先端部に嵌挿されるものであり、先端には軸線方向
に複数個に分割された拡開部片３１を有している。そし
て、スリーブ３の拡開部片３１および軸部３２の外周表
面には、凹凸が設けられている。FIG. 1 shows an example of a pull-out rod material 1 used in the present invention, which is composed of a shaft material 2 and a sleeve 3.
The shaft member 2 has a frustoconical shape in which the diameter of the tip end portion 21 increases toward the tip end, and a male screw portion 22 is provided at the base end portion. Further, the sleeve 3 is fitted from the base end of the shaft member 2 and fitted into the tip end portion, and the tip end has an expanding portion piece 31 which is divided into a plurality of pieces in the axial direction. The outer peripheral surface of the expanding portion piece 31 and the shaft portion 32 of the sleeve 3 is provided with irregularities.
【００１６】本発明による引抜試験方法を図２に基づい
て順に説明すると、先ず、基盤２０に吹き付けられた後
硬化し、表面が平らに整形されたコンクリート１０の任
意の位置にドリル等で穿孔し、更に、市販されている拡
底穿孔用工具等を用いて、図２（Ａ）のように孔の底部
を拡大させた取付孔１１を形成する。取付孔１１の深さ
は、引抜棒材１を差し込んだときに雄ねじ部２２が所定
の長さを確保してコンクリート１０の表面に突出される
ように決定され、取付孔１１の孔径は、引抜棒材１の外
径よりも少し大きくされる。そして、後に充填する接着
剤との付着をよくするために、取付孔１１の中にたまっ
たコンクリートかす等は取り除いておく。また、周側壁
１３には細かい凹凸がある方が好ましい。The pull-out test method according to the present invention will be described in order with reference to FIG. 2. First, the concrete 20 having been sprayed on the base 20 and then cured and the surface of which has been flattened is drilled at an arbitrary position. Further, using a commercially available bottom-drilling tool or the like, the mounting hole 11 in which the bottom of the hole is enlarged is formed as shown in FIG. 2 (A). The depth of the mounting hole 11 is determined so that the male screw portion 22 secures a predetermined length and is projected onto the surface of the concrete 10 when the pulling rod 1 is inserted. It is made slightly larger than the outer diameter of the bar 1. Then, in order to improve the adhesion with the adhesive to be filled later, concrete dust and the like accumulated in the mounting hole 11 are removed. Further, it is preferable that the peripheral side wall 13 has fine irregularities.
【００１７】次に、図２（Ｂ）に示すように、例えば中
心に取付孔１１の基端部に挿入される突起６１を有し、
突起６１と同心で所定の径を有する円上に先端縁に切削
刃６２を形成したドラム刃を有する工具６を用いて、コ
ンクリート１０の表面に取付孔１１と同心の円上に所定
深さの溝４１を形成する。この溝４１は、取付孔１１の
中心軸線と平行の方向に削穴され、その底面は取付孔１
１の中心軸線と直角となるように形成される。Next, as shown in FIG. 2B, for example, a projection 61 to be inserted into the base end portion of the mounting hole 11 is provided at the center,
Using a tool 6 having a drum blade having a cutting edge 62 formed on a circle concentric with the protrusion 61 and having a predetermined diameter, the surface of the concrete 10 has a predetermined depth on a circle concentric with the mounting hole 11. The groove 41 is formed. The groove 41 is drilled in a direction parallel to the central axis of the mounting hole 11, and the bottom surface of the groove 41 is mounted in the mounting hole 1.
It is formed so as to be perpendicular to the central axis line of 1.
【００１８】そして、適量の接着剤、例えば二液式のエ
ポキシ樹脂等の合成樹脂系接着剤４を側壁１３に沿って
取付孔１１に注入する。そして、接着剤４が硬化しない
うちに、引抜棒材１を取付孔１１に挿入する。引抜棒材
１が孔底に達した後、打込棒等を用いてスリーブ３を先
端方向へ打ち込むと、スリーブ３の先端の拡開部片３１
が軸材２の先端部２１の外周に沿って拡開し、拡大孔部
１２の孔壁１４に喰いつくことによって、引抜棒材１が
固定される。このとき、取付孔１１の底部は予め拡大さ
れているので、拡開部片３１は確実にスリーブ３の軸部
３２よりも拡がり、引抜部材１だけが滑って抜けること
がない。また、接着剤４は、引抜棒材１の側面に押し付
けられて、側壁１３と引抜棒材１との間隙を充填する。Then, an appropriate amount of adhesive, for example, a synthetic resin adhesive 4 such as a two-component epoxy resin is injected into the mounting hole 11 along the side wall 13. Then, the pull-out rod 1 is inserted into the mounting hole 11 before the adhesive 4 is cured. After the pull-out rod material 1 reaches the bottom of the hole, when the sleeve 3 is driven in the front end direction using a driving rod or the like, the expanding portion piece 31 at the front end of the sleeve 3
Expands along the outer periphery of the tip portion 21 of the shaft member 2 and hits the hole wall 14 of the expansion hole portion 12, whereby the pull-out rod member 1 is fixed. At this time, since the bottom portion of the mounting hole 11 is enlarged in advance, the expanding portion piece 31 surely expands beyond the shaft portion 32 of the sleeve 3, and only the pulling member 1 does not slip out. Further, the adhesive 4 is pressed against the side surface of the drawing bar material 1 to fill the gap between the side wall 13 and the drawing bar material 1.
【００１９】尚、接着剤４が孔底１５に達して引抜棒材
１の先端が孔底１５と接着するのを防ぐために、図２
（Ｃ）に示したように、孔底１５に吸収材５を設置する
とよい。この吸収材５は、余分な接着剤４を吸収すると
ともに、引抜棒材１の先端と樹脂接着しても、引抜試験
時に容易に破断して引抜荷重に影響を与えないような材
質のものが用いられ、例えばスポンジ、特に独立気泡の
スポンジ等を用いるのが好ましい。In order to prevent the adhesive 4 from reaching the hole bottom 15 and adhering the tip of the drawn bar 1 to the hole bottom 15, FIG.
As shown in (C), the absorber 5 may be installed on the bottom 15 of the hole. The absorbent material 5 is made of a material that absorbs the excess adhesive 4 and does not easily break during pull-out test to affect the pull-out load even if the tip of the pull-out bar 1 is resin-bonded. It is preferable to use, for example, a sponge, particularly a closed-cell sponge.
【００２０】そして、接着剤４が硬化して引抜棒材１が
取付孔１１内に完全に固定されたら、溝４１に硬質材料
で作られた円筒体７を嵌め込み配置し、更に雄ねじ部２
２に引抜シャフト８をねじ込んで取り付け、円筒体７を
押さえ付けて反力を支持させながら、油圧ジャッキ等に
よって引抜シャフト８を引っ張り、引抜棒材１を引き抜
く。When the adhesive 4 is hardened and the pull-out rod 1 is completely fixed in the mounting hole 11, a cylindrical body 7 made of a hard material is fitted in the groove 41, and the male screw 2
The pull-out shaft 8 is screwed into and attached to 2, and while pulling out the pull-out shaft 1 by pulling the pull-out shaft 8 with a hydraulic jack or the like while pressing the cylindrical body 7 to support the reaction force.
【００２１】このとき、引抜棒材１とともに、引抜棒材
１の拡開部片３１および接着剤４によって一体化された
コンクリート１０に剪断力がかかり、溝４１で囲まれた
円形のコンクリート表面部１６を底面とするコーン状の
コンクリート２５が引き抜かれる。そのときの破壊荷重
を剪断面積で除して求めた値である剪断強度とコンクリ
ートの圧縮強度との相関は、過去の実験による実験式で
表されており、これによってコンクリートの圧縮強度が
求められるのである。At this time, a shearing force is applied to the concrete 10 integrated by the expanding piece 31 of the pulling bar 1 and the adhesive 4 together with the pulling bar 1, and a circular concrete surface portion surrounded by the groove 41 is applied. The cone-shaped concrete 25 having 16 as the bottom surface is pulled out. The correlation between the shear strength, which is the value obtained by dividing the breaking load at that time by the shear cross-sectional area, and the compressive strength of concrete is expressed by an empirical formula based on past experiments, and the compressive strength of concrete can be obtained by this. Of.
【００２２】尚、本発明で用いられる引抜棒材は、図１
に示したタイプの他にも、例えば雌ねじタイプのメカニ
カルアンカと雄ねじ杆とを組み合わせたもの等、既知の
どのようなメカニカルアンカでも用いることができる。The drawing rod used in the present invention is shown in FIG.
In addition to the type shown in FIG. 1, any known mechanical anchor such as a combination of a female screw type mechanical anchor and a male screw rod can be used.
【００２３】また、溝４１の形成は、引抜棒材１を設置
して接着剤４が硬化した後、引抜棒材１の雄ねじ部２２
に、中心に雌ねじを有し所定の径をもつ円上に先端縁に
切削刃を形成したドラム状の刃を有する工具をねじ込ん
で取り付け、ドラム刃を回転させて削穴する方法で行っ
てもよい。或いは、中心に通常のドリル刃を有し、ドリ
ル刃と同心の円上に先端縁に切削刃を形成したドラム状
の刃を有する例えばコアドリルと呼ばれ市販されている
切削工具を用いれば、取付孔１１の下穴と溝４１とを同
時に形成することができ、工程が簡単になるうえ、取付
孔１１と溝４１とを正確に同心に形成することが容易に
なる。更に、中心のドリル刃が拡底穿孔用の切削工具を
用いれば、工程が一層容易になる。尚、溝４１で囲まれ
るコーン形の底面の径は、図２（Ｄ）に示した角αが６
０度乃至６８度程度になるような大きさとなることが好
ましいとされている。The groove 41 is formed by setting the pull-out rod 1 and curing the adhesive 4 and then forming the male screw portion 22 of the pull-out rod 1.
In addition, even if it is carried out by a method in which a tool having a drum-shaped blade having a cutting blade formed on the tip edge is screwed into a circle having a female screw in the center and a predetermined diameter, and the drum blade is rotated to make a hole. Good. Alternatively, if you use a commercially available cutting tool called a core drill, for example, you have a normal drill blade in the center and a drum-shaped blade with a cutting blade formed on the tip edge on a circle concentric with the drill blade The prepared hole of the hole 11 and the groove 41 can be formed at the same time, which simplifies the process and facilitates the mounting hole 11 and the groove 41 to be accurately and concentrically formed. Further, if the cutting tool having the central drill blade for widening the bottom is used, the process becomes easier. The cone-shaped bottom surface surrounded by the groove 41 has a diameter α of 6 as shown in FIG.
It is said that the size is preferably 0 to 68 degrees.
【００２４】本発明では、コンクリート１０が硬化した
後、引抜棒材１を設置する前にコンクリート１０の表面
を整形することができるので、コンクリート１０の表面
に円筒体を押さえ付けて反力を支持させても、引抜角度
が傾いたり表面に反力が均等に伝わりにくくなったりす
ることがない。従って、溝４１を形成せずに引抜試験を
行ってもよい。In the present invention, since the surface of the concrete 10 can be shaped after the concrete 10 has hardened and before the pulling rod 1 is installed, the cylindrical body is pressed against the surface of the concrete 10 to support the reaction force. Even if it is done, the pulling angle is not inclined and it is difficult for the reaction force to be evenly transmitted to the surface. Therefore, the pull-out test may be performed without forming the groove 41.
【００２５】[0025]
【実施例】以下、本発明の実施例について述べる。Embodiments of the present invention will be described below.
【００２６】先ず、硬化したコンクリートに、下穴用の
ドリルで下穴をあけ、その後拡底穿孔用工具によって下
穴の底部を拡大させ、取付孔を形成した。そして、引抜
棒材と孔底とが樹脂接着しないように、孔底部にスポン
ジを挿入した。First, a prepared hole was drilled in the hardened concrete with a prepared hole drill, and then the bottom portion of the prepared hole was enlarged by a tool for expanding the bottom to form a mounting hole. Then, a sponge was inserted at the bottom of the hole so that the drawn rod and the bottom of the hole would not adhere to the resin.
【００２７】次に、取付孔内に、二液式のエポキシ樹脂
を混合して注入し、図１に示したような先端拡開式の引
抜棒材を差し込んだ。Next, a two-component epoxy resin was mixed and injected into the mounting hole, and a tip-expanding type withdrawal rod member as shown in FIG. 1 was inserted.
【００２８】そして、打込棒で引抜棒材のスリーブを打
ち込み、先端を拡大孔部内で拡開させて引抜棒材を取付
孔に固定した。Then, the sleeve of the pull-out rod material was driven in with the drive rod, and the tip end was opened in the enlarged hole portion to fix the pull-out rod material in the mounting hole.
【００２９】エポキシ樹脂が硬化した後、引抜棒材の基
端部の雄ねじを利用して、内径９０ｍｍ、外径１０４ｍ
ｍのドラム状の刃をもつ切削工具を取り付け、引抜高さ
５５ｍｍを確保するような深さに溝を形成した。After the epoxy resin is hardened, an inner diameter of 90 mm and an outer diameter of 104 m are used by using a male screw at the base end of the drawn bar.
A cutting tool having a drum-shaped blade of m was attached, and a groove was formed in such a depth as to secure a drawing height of 55 mm.
【００３０】そして、その溝に、内径９２ｍｍ、外径１
０２ｍｍの円筒体を設置し、切削工具を取り外した引抜
棒材の雄ねじ部に引抜シャフトをねじ込んで取り付け、
油圧ジャッキで引き抜いた。このとき、引き抜かれたコ
ンクリートは、ほぼ予想された通りのコーン形状となっ
て剪断破壊していた。そして、破壊荷重をコーンの破断
面の面積で除して求めた剪断強度は５４ｋｇ／ｃｍ2で
あり、同じコンクリートでサンプルを採って圧縮強度試
験を行った結果、圧縮強度は２２０ｋｇ／ｃｍ2であっ
た。Then, in the groove, an inner diameter of 92 mm and an outer diameter of 1
Install a 02mm cylinder, screw the extraction shaft into the external thread of the extraction rod, and remove the cutting tool.
It was pulled out with a hydraulic jack. At this time, the concrete that had been pulled out had a cone shape almost as expected, and had shear fractured. Then, the shear strength obtained by dividing the breaking load by the area of the fracture surface of the cone was 54 kg / cm 2 , and as a result of performing the compressive strength test using a sample of the same concrete, the compressive strength was 220 kg / cm 2 . there were.
【００３１】圧縮強度と剪断強度との相関関係は予め実
験結果による経験式として求められており、その式σ＝
４．４τ−１８（但し、σ：圧縮強度，τ：剪断強度）
に上記の剪断強度５４ｋｇ／ｃｍ2を代入すると、圧縮
強度は２１９．６ｋｇ／ｃｍ2となり、サンプルでの圧
縮強度試験結果とほぼ等しい値となることがわかった。
従って、本発明の引抜試験により求めた剪断強度によっ
てコンクリートの圧縮強度が正確に推定できることが確
認された。The correlation between the compressive strength and the shear strength has been previously obtained as an empirical formula based on experimental results, and the formula σ =
4.4 τ-18 (where σ: compressive strength, τ: shear strength)
Substituting the above shear strength 54kg / cm 2, the compressive strength was found to be substantially equal to the compressive strength test results for 219.6kg / cm 2, and the samples.
Therefore, it was confirmed that the compressive strength of concrete can be accurately estimated by the shear strength obtained by the pull-out test of the present invention.
【００３２】[0032]
【発明の効果】本発明によると、コンクリートが硬化し
た後に任意の場所の引抜試験を行うことができる。According to the present invention, the pull-out test can be conducted at any place after the concrete is hardened.
【００３３】しかも、予め取付孔の底部を拡大させてい
るので、引抜棒材先端の拡開部片が確実に拡開してスリ
ーブの軸部よりも拡がり、引抜棒材だけが滑って抜けて
しまうことがない。加えて、接着剤で引抜棒材とコンク
リートとが引抜高さ全体にわたって均一に付着固定され
るので、応力の集中が起こらずに正確な引抜試験を行う
ことができる。Moreover, since the bottom portion of the mounting hole is enlarged in advance, the expanding piece at the tip of the withdrawing rod member surely expands and expands beyond the shaft portion of the sleeve, and only the withdrawing rod member slips out. There is no end. In addition, since the pulling rod and the concrete are evenly adhered and fixed by the adhesive over the entire pulling height, it is possible to perform an accurate pulling test without concentration of stress.
【００３４】また、溝を設けて反力を支持させることに
より、一層、引抜角度および反力の位置や方向を正確に
固定することができ、正確な強度試験を行うことができ
るようになる。Further, by providing the groove to support the reaction force, the pull-out angle and the position and direction of the reaction force can be more accurately fixed, and an accurate strength test can be performed.
【００３５】更に、引抜棒材の取付孔と反力支持のため
の円筒体用溝を同時に形成することができる工具を用い
れば、工程が簡略化されるうえ、取付孔と溝とを同心に
形成することが容易になる。Furthermore, if a tool capable of simultaneously forming the mounting hole for the drawn rod and the cylindrical groove for supporting the reaction force is used, the process is simplified and the mounting hole and the groove are concentric. It is easy to form.
【００３６】更にまた、引抜棒材の外周に凹凸を設ける
ことによって、引抜棒材と接着剤との付着力も十分に確
保できる。Furthermore, by providing irregularities on the outer circumference of the drawn bar, it is possible to sufficiently secure the adhesive force between the drawn bar and the adhesive.
【図１】本発明に用いられる引抜棒材の一例を示す側面
図である。FIG. 1 is a side view showing an example of a pull-out rod material used in the present invention.
【図２】本発明の実施の形態を示す縦断面図である。FIG. 2 is a vertical sectional view showing an embodiment of the present invention.
【図３】図２のａ部の拡大断面図である。FIG. 3 is an enlarged cross-sectional view of portion a of FIG.
【図４】従来例を示す縦断面図である。FIG. 4 is a longitudinal sectional view showing a conventional example.
１ 引抜棒材 ４ 接着剤 ７ 円筒体 １０ コンクリート １１ 取付孔 １２ 拡大孔部 １３ 孔壁 ３１ 拡開部片 1 Drawing Bar Material 4 Adhesive 7 Cylindrical Body 10 Concrete 11 Mounting Hole 12 Expanding Hole 13 Hole Wall 31 Expanding Piece
Claims (5)
した底部が拡大された取付孔にメカニカルアンカ式の引
抜棒材を挿入した後、前記引抜棒材の先端を前記取付孔
の拡大孔部内で拡開させるとともに、前記取付孔と前記
引抜棒材との空隙に充填した接着剤を硬化させて前記引
抜棒材を前記コンクリートに固定し、次いで前記コンク
リート表面上の前記引抜棒材と同心となる円上に配置し
た円筒体に反力を支持させて前記引抜棒材を引き抜き、
前記コンクリートがコーン状に剪断破壊されるときの剪
断強度を用いて前記コンクリートの圧縮強度を求めるこ
とを特徴とするコンクリートの強度試験方法。1. A mechanical anchor type drawing rod is inserted into a mounting hole having an enlarged bottom formed at an arbitrary portion of hardened concrete, and then the tip of the drawing rod is placed within the enlarged hole of the mounting hole. While expanding, the adhesive filled in the space between the attachment hole and the pull rod is cured to fix the pull rod to the concrete, and then become concentric with the pull rod on the concrete surface. Withdrawing the drawing bar by supporting the reaction force on the cylindrical body arranged on the circle,
A method for testing the strength of concrete, wherein the compressive strength of the concrete is obtained by using the shear strength when the concrete is sheared and broken into a cone shape.
記引抜棒材と直角となる溝を設け、その溝に円筒体を嵌
め込み配置する請求項１記載のコンクリートの強度試験
方法。2. The concrete strength test method according to claim 1, wherein a groove having a bottom surface at a right angle to the drawing bar is provided on a circle centered on the drawing bar, and a cylindrical body is fitted in the groove and arranged.
周囲に同心に配置したドラムの先端縁に切削刃を形成し
たドラム刃を有する切削工具によって、引抜棒材の取付
孔と円筒体を嵌め込む溝とを同時に形成する請求項２記
載のコンクリートの強度試験方法。3. A mounting tool for a pull-out rod and a cylindrical body by a cutting tool having a drum blade having a drill blade in the center and a cutting blade formed at the tip edge of a drum concentrically arranged around the drill blade. The strength test method for concrete according to claim 2, wherein the groove for fitting the groove is formed at the same time.
載のコンクリートの強度試験方法。4. The method for testing the strength of concrete according to claim 3, wherein the drill blade is for deep-bottom drilling.
る請求項１，２，３，４いずれかに記載のコンクリート
の強度試験方法。5. The method for testing the strength of concrete according to claim 1, wherein a drawn bar material having irregularities on the outer peripheral surface is used.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1944796A JPH09189694A (en) | 1996-01-10 | 1996-01-10 | Method for testing strength of concrete |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1944796A JPH09189694A (en) | 1996-01-10 | 1996-01-10 | Method for testing strength of concrete |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09189694A true JPH09189694A (en) | 1997-07-22 |
Family
ID=11999572
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1944796A Pending JPH09189694A (en) | 1996-01-10 | 1996-01-10 | Method for testing strength of concrete |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09189694A (en) |
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|---|---|---|---|---|
| WO2001002830A1 (en) * | 1999-07-02 | 2001-01-11 | Simpson Strong-Tie Company, Inc. | Direct tension indicator for embedded anchor members |
| KR100303855B1 (en) * | 1999-07-30 | 2001-09-13 | 오봉석 | An Apparatus for Measuring Solidity of Concrete |
| CN101819115A (en) * | 2010-04-27 | 2010-09-01 | 中南大学 | Method for testing shear strength of brittle material by utilizing concentric cylindrical test sample |
| RU2470284C2 (en) * | 2009-01-13 | 2012-12-20 | Общество с ограниченной ответственностью Научно-производственное предприятие "Интерприбор" | Method to determine strength of concrete by method of rib chipping |
| RU2502976C1 (en) * | 2012-04-19 | 2013-12-27 | Общество с ограниченной ответственностью Научно-производственное предприятие "Интерприбор" | Method to determine concrete strength by rib chipping |
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1996
- 1996-01-10 JP JP1944796A patent/JPH09189694A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001002830A1 (en) * | 1999-07-02 | 2001-01-11 | Simpson Strong-Tie Company, Inc. | Direct tension indicator for embedded anchor members |
| KR100303855B1 (en) * | 1999-07-30 | 2001-09-13 | 오봉석 | An Apparatus for Measuring Solidity of Concrete |
| RU2470284C2 (en) * | 2009-01-13 | 2012-12-20 | Общество с ограниченной ответственностью Научно-производственное предприятие "Интерприбор" | Method to determine strength of concrete by method of rib chipping |
| CN101819115A (en) * | 2010-04-27 | 2010-09-01 | 中南大学 | Method for testing shear strength of brittle material by utilizing concentric cylindrical test sample |
| RU2502976C1 (en) * | 2012-04-19 | 2013-12-27 | Общество с ограниченной ответственностью Научно-производственное предприятие "Интерприбор" | Method to determine concrete strength by rib chipping |
| CN104297054A (en) * | 2014-10-15 | 2015-01-21 | 东南大学 | Auxiliary linear anchoring device for researching tensile properties of FRP (Fiber Reinforced Polymer) ribs |
| CN104374648A (en) * | 2014-11-20 | 2015-02-25 | 广州市建筑科学研究院有限公司 | Test device and test method for testing kinetic shear characteristics between pipe piles and grouting soil bodies |
| CN104374649A (en) * | 2014-11-20 | 2015-02-25 | 广州市建筑科学研究院有限公司 | Testing device and method for observing shear deformation failure characteristics between tubular pile and grouting soil body |
| CN104374649B (en) * | 2014-11-20 | 2017-07-25 | 广州市建筑科学研究院有限公司 | A kind of experimental rig and method for being used to observe shear deformation breaks down feature between pile tube and the slip casting soil body |
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| CN104849152A (en) * | 2015-05-29 | 2015-08-19 | 长安大学 | Method for evaluating construction quality of stone-planting cement concrete bridge deck pavement structure |
| CN107063892A (en) * | 2017-04-12 | 2017-08-18 | 东北大学 | A kind of method that utilization Hopkinson pressure bar calculates concrete dynamic shear strength |
| JP6308541B1 (en) * | 2017-07-03 | 2018-04-11 | 中日本ハイウェイ・エンジニアリング東京株式会社 | How to collect columnar samples of concrete structural members |
| JP2019012052A (en) * | 2017-07-03 | 2019-01-24 | 中日本ハイウェイ・エンジニアリング東京株式会社 | Columnar sample collection method of concrete structure member |
| CN107817154A (en) * | 2017-10-26 | 2018-03-20 | 哈尔滨工业大学 | Multifunctional concrete list draws specimen molding and experimental provision |
| CN109187341A (en) * | 2018-10-23 | 2019-01-11 | 厦门建研建筑产业研究有限公司 | A kind of anti-method for beating stone material adhesion strength of sample detection exterior finish |
| CN109883778A (en) * | 2019-01-21 | 2019-06-14 | 绍兴文理学院 | Anchor structure face shearing test minimum sample determines method |
| CN109883778B (en) * | 2019-01-21 | 2022-05-20 | 绍兴文理学院 | Method for determining minimum sample in shear test of anchoring structure surface |
| WO2022105045A1 (en) * | 2020-11-19 | 2022-05-27 | 山东科技大学 | In-situ testing device and method for strength of rock surrounding anchor bolt support roadway |
| US11703432B2 (en) | 2020-11-19 | 2023-07-18 | Shandong University Of Science And Technology | In-situ test device for surrounding rock strength of bolt supported roadway and method thereof |
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