JPS6190037A - Method and device for measuring compressive strength of concrete - Google Patents
Method and device for measuring compressive strength of concreteInfo
- Publication number
- JPS6190037A JPS6190037A JP21194684A JP21194684A JPS6190037A JP S6190037 A JPS6190037 A JP S6190037A JP 21194684 A JP21194684 A JP 21194684A JP 21194684 A JP21194684 A JP 21194684A JP S6190037 A JPS6190037 A JP S6190037A
- Authority
- JP
- Japan
- Prior art keywords
- concrete
- weight body
- speed
- compressive strength
- compression coil
- 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
- 238000000034 method Methods 0.000 title claims description 19
- 238000001514 detection method Methods 0.000 claims description 4
- 238000004146 energy storage Methods 0.000 claims description 3
- 230000006835 compression Effects 0.000 abstract description 15
- 238000007906 compression Methods 0.000 abstract description 15
- 238000005259 measurement Methods 0.000 abstract description 8
- 230000004907 flux Effects 0.000 abstract description 4
- 238000009415 formwork Methods 0.000 description 12
- 239000012528 membrane Substances 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 238000000691 measurement method Methods 0.000 description 3
- 239000000428 dust Substances 0.000 description 2
- 238000009529 body temperature measurement Methods 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000001902 propagating effect Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000009751 slip forming Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/30—Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight
- G01N3/307—Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight generated by a compressed or tensile-stressed spring; generated by pneumatic or hydraulic means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/38—Concrete; Lime; Mortar; Gypsum; Bricks; Ceramics; Glass
- G01N33/383—Concrete or cement
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Food Science & Technology (AREA)
- Medicinal Chemistry (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は若材令コンクリートの圧縮強度を容易かつ正確
に測定することができるコンクリート圧縮強度測定方法
及び装置を得ることが目的である。DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The object of the present invention is to obtain a concrete compressive strength measuring method and apparatus that can easily and accurately measure the compressive strength of young concrete.
打設されたコンクリートの強度発現に伴い、型枠を上昇
させて次第に高位置へコンクリートを打設するスリップ
フオーム工法等では若材令コンクリートの強度を正確に
把握する必要がある。As the strength of the poured concrete increases, it is necessary to accurately grasp the strength of young concrete in slip form construction methods, etc., in which the formwork is raised and concrete is gradually poured into higher positions.
一般的に若材令コンクリートの強度測定には、超音波伝
播測定法、積算温度測定法、鋼棒四人量測定法等が用い
られている。Generally, methods such as ultrasonic propagation measurement method, integral temperature measurement method, steel bar four-person measurement method, etc. are used to measure the strength of young concrete.
超音波伝播速度測定法では、コンクリート内を伝播する
超音波の速度がコンクリート強度に応して変化すること
を利用している。The ultrasonic propagation velocity measurement method utilizes the fact that the speed of ultrasonic waves propagating in concrete changes depending on the strength of the concrete.
しかし若材令コンクリートは、表面が軟弱であり、超音
波送受信機の取りつけが困難である。またコンクリート
内部の超音波伝播速度は鋼製型枠よりも遅いため、また
超音波がコンクリート内部に配置される鉄筋の影響を受
けて変化しやすいため、正確な超音波伝播速度を測定す
ることは不可能である。However, young concrete has a soft surface, making it difficult to install an ultrasonic transceiver. In addition, since the ultrasonic propagation speed inside concrete is slower than that in steel formwork, and because ultrasonic waves are easily affected by the reinforcing bars placed inside the concrete and change, it is difficult to accurately measure the ultrasonic propagation speed. It's impossible.
積算温度測定方法は、コンクリートが硬化するまでに放
出する熱量が判断できるため、所定時間毎に温度を測定
してこれを積算することによりコンクリート弾度を計算
するようになっている。The cumulative temperature measuring method allows determining the amount of heat emitted until concrete hardens, so the concrete elasticity is calculated by measuring the temperature at predetermined time intervals and integrating the values.
しかしこの方法の場合にも、コンクリート表面温変が型
枠、スランプ、冷却水等の影響を受けやすく、正確な測
定に乱れを生ずる場合がある。However, even with this method, the concrete surface temperature change is easily influenced by the formwork, slump, cooling water, etc., and accurate measurements may be disturbed.
鋼棒貫入法は、所定圧力の鋼棒をコンクリートへ挿入す
ることにより、その挿入量の相違でコンクリート強度を
計算する。The steel rod penetration method calculates the strength of concrete by inserting a steel rod at a predetermined pressure into concrete, based on the difference in the amount of insertion.
しかしこの方法による場合には、鋼棒の駆動荷重が大き
く、装置が大型になる。また駆動荷重が大きいため、型
枠へ加わる反力が大きく、型枠の補強が必要となる。However, in this method, the driving load of the steel rod is large and the device becomes large. Furthermore, since the driving load is large, the reaction force applied to the formwork is large, making it necessary to reinforce the formwork.
上記の方法以外にも各種の測定方法が試みられているが
、容易かつ正確な強度測定方法及び装置は得られていな
い。Although various measuring methods other than the above-mentioned method have been attempted, an easy and accurate method and apparatus for measuring strength have not yet been obtained.
本発明は上記事実を考慮し、容易かつ正確にコンクリー
ト圧縮強度を測定することができる方法及び装置を得る
ことが目的である。The present invention takes the above facts into consideration and aims to provide a method and apparatus that can easily and accurately measure concrete compressive strength.
Ｃ問題点を解決すべき手段及び作用〕
本発明に係るコンクリート圧縮強度測定方法は、コンク
リートへ受圧板を密着させ、この受圧板へ錘体を打撃さ
せ、この打撃速度と反発速度との比によりコンクリート
の圧縮強度を求めることを特徴としている。Means and operation for solving problem C] The method for measuring concrete compressive strength according to the present invention involves bringing a pressure receiving plate into close contact with the concrete, causing a weight body to impact the pressure receiving plate, and determining the ratio of the impact speed to the repulsion speed. It is characterized by determining the compressive strength of concrete.
本発明に係るコンクリート圧縮強度測定Ｗ ！では、コ
ンクリート表面への当接用受圧板と、この受圧板への打
撃用錘体と、この錘体を受圧板へ打撃する弾性体と、こ
の弾性体のエネルギ蓄積状態を保持するラッチ手段と、
前記受圧板への錘体打撃速度及び反発速度を検出する検
出手段とを有している。Concrete compressive strength measurement W according to the present invention! Here, a pressure plate for contacting the concrete surface, a weight body for striking the pressure plate, an elastic body for striking the weight body against the pressure plate, and a latch means for maintaining the energy storage state of the elastic body. ,
and detection means for detecting the weight impact speed and repulsion speed on the pressure receiving plate.
従って本発明では、錘体の打撃速度と反発速度の比によ
り容易にコンクリート圧縮強度が測定できるようになっ
ている。Therefore, in the present invention, concrete compressive strength can be easily measured by the ratio of the impact speed and rebound speed of the weight.
第１図には本実施例に係る測定装置１０を用いて若材令
コンクリート１２の圧縮強度をＩＩＩ定している状態が
示されている。FIG. 1 shows a state in which the compressive strength of young concrete 12 is determined using the measuring device 10 according to this embodiment.
若材令コンクリート１２は型枠１４内へ打設されており
、この型枠１４には窓１６が形成されている。この窓１
６は若材令コンクリート１２の打設状態では図示しない
蓋板が当接されて若材令コンクリート１２の流出を防い
でいる。しかし打設後の所定時間経過後に若材令コンク
リ−）１２がある程度硬化した状態で取り外され、窓１
６の周縁に測定装置１０が取りつけられるようになって
いる。Young concrete 12 is poured into a formwork 14, and windows 16 are formed in this formwork 14. This window 1
6 is in contact with a cover plate (not shown) when the young concrete 12 is placed to prevent the young concrete 12 from flowing out. However, after a predetermined period of time has passed after pouring, the young concrete 12 is removed after it has hardened to some extent, and the window 1 is removed.
A measuring device 10 is attached to the periphery of 6.
測定装置１０は窓１６の周縁の型枠Ｉ４へ当接（必要に
応じて固定）されるケース１８を有している。このケー
ス１８は密閉構造とされて外部からの埃侵入を防いでい
る。The measuring device 10 has a case 18 that is brought into contact (fixed as necessary) to the formwork I4 at the periphery of the window 16. This case 18 has a sealed structure to prevent dust from entering from the outside.
ケース１８には筒体２０が一体的に固着されており、こ
の筒体２０は窓１６の内径とほぼ等しい内径を有してい
る。A cylindrical body 20 is integrally fixed to the case 18, and this cylindrical body 20 has an inner diameter approximately equal to the inner diameter of the window 16.
この筒体２０には袋ナツト２２が圧入、ボルト締め等で
取りつけられている。この袋ナツト２２はその内周部が
ケース２４の外周部と螺合している。この袋ナツト２２
のケース２４への螺合量は両者間に介在されるシール兼
用のワッシャ２６によって制限されている。このワッシ
ャ２６と袋ナツト２２との間には弾性膜２８の外周部付
近が挟持されている。A cap nut 22 is attached to the cylindrical body 20 by press fitting, bolt tightening, or the like. The inner periphery of this cap nut 22 is threadedly engaged with the outer periphery of the case 24. This bag nut 22
The amount of screwing into the case 24 is limited by a washer 26 interposed between the two that also serves as a seal. The vicinity of the outer periphery of the elastic membrane 28 is held between the washer 26 and the cap nut 22.
この弾性膜２８は軸心部に貫通孔が形成されていると共
に、貫通孔周囲へ受圧（反３０が固着されている。この
受圧板３０はその一端面がその袋ナツト２２の一端面と
同一面を構成している。This elastic membrane 28 has a through hole formed in its axial center, and a pressure receiving plate 30 is fixed around the through hole.One end surface of this pressure receiving plate 30 is the same as one end surface of the cap nut 22. It makes up the surface.
ケース２４と弾性膜２８との間には圧縮コイルばね３２
が介在されており、受圧板３０の−Ｏｍ 、ｉｉｉを袋
ナツト２２の一端面から突出する方向へ付＝％４１して
いる。A compression coil spring 32 is provided between the case 24 and the elastic membrane 28.
is interposed, and -Om, iii of the pressure receiving plate 30 is attached in a direction protruding from one end surface of the cap nut 22.
従って袋ナツト２２の一端面から突出した受！４板３０
は、第１図に示される如く測定装置ＩＯかコンクリート
１２へ当）妾されると、コンクリート１２の表面と当接
して圧縮コイルばね３２の付勢力に抗して袋ナツト２２
内へ押し込まれることになる。このため受圧板３０は常
に一定の付勢力でコンクリート１２へ当接されることに
なる。Therefore, the receiver protrudes from one end surface of the cap nut 22! 4 plates 30
When the measuring device IO is brought into contact with the concrete 12 as shown in FIG.
It will be pushed inside. Therefore, the pressure receiving plate 30 is always brought into contact with the concrete 12 with a constant urging force.
ケース２４の内周部には固定筒３４の先端部外周が螺合
されている。The outer periphery of the tip of the fixed cylinder 34 is screwed into the inner periphery of the case 24 .
第３図に示される如く固定筒３４の他の一端部の外周に
は移動筒３６が被嵌されている。この移動筒３６の先端
部にはばね座３８が固着されており、移動筒３６の内周
部に配置される大圧縮コイルばね４０の一端が当接され
ている。この大圧縮コイルばね４ｏの他端は固定筒３４
の一端へ取りつけられるばね座４２へ当接している。こ
れによって移動筒３６は固定筒３４がら抜は出す方向に
付勢されている。As shown in FIG. 3, a movable cylinder 36 is fitted onto the outer periphery of the other end of the fixed cylinder 34. A spring seat 38 is fixed to the distal end of the movable cylinder 36, and one end of a large compression coil spring 40 disposed on the inner circumference of the movable cylinder 36 is brought into contact with the spring seat 38. The other end of this large compression coil spring 4o is a fixed cylinder 34
It abuts against a spring seat 42 attached to one end of the spring. As a result, the movable cylinder 36 is urged in a direction to be removed from the fixed cylinder 34.
ばね座３８へ一端が固着された案内筒４４は中間部がば
ね座４２を貫通して固定筒３４の内部へ至っており、チ
ャック４６の基部を支持している。A guide cylinder 44 whose one end is fixed to the spring seat 38 has an intermediate portion passing through the spring seat 42 to reach the inside of the fixed cylinder 34, and supports the base of the chuck 46.
このチャック４６は先端鉤部が錘体４８の首部５０を挟
持する方向に付勢力を生じている。This chuck 46 generates a biasing force in a direction in which the hook portion at the tip clamps the neck portion 50 of the weight body 48 .
また案内筒４４内にはロッド５２が貫通しており、この
ロッド５２の先端部は移動筒３６の端部から突出し、解
除釦５４が固着されている。型枠１４はばね座３８との
間に復帰圧縮コイルばね５６が介在されており、これに
よってばね座３８から突出する方向に付勢力を受けてい
る。案内筒４・１から突出するロッド５２の他の一端部
はラッチ手段を構成するチャック４６の内側へ対応した
解除軸５８となっている。この解除軸５８は通常時は解
除釦５４が復帰圧縮コイルばね５６の付勢力を受けるこ
とによりチャック４６の内部突起と離間しているが、解
除釦５４が復帰圧縮コイルはね５６の付勢力に抗してば
ね座３８内へ押し込まれると、チャック４６を拡開して
錘体４８を自由状態とするようになっている。チャック
４６は解除軸５８と離間した状態では付勢力で縮径する
ようになっており、錘体４８の首部５０を把持している
。A rod 52 passes through the guide tube 44, and the tip of the rod 52 protrudes from the end of the movable tube 36, to which a release button 54 is fixed. A return compression coil spring 56 is interposed between the formwork 14 and the spring seat 38, and is thereby biased in a direction protruding from the spring seat 38. The other end of the rod 52 protruding from the guide tube 4.1 serves as a release shaft 58 that corresponds to the inside of the chuck 46 constituting the latch means. This release shaft 58 is normally separated from the internal protrusion of the chuck 46 because the release button 54 receives the urging force of the return compression coil spring 56; When pushed into the spring seat 38 against resistance, the chuck 46 is expanded and the weight body 48 is set in a free state. When the chuck 46 is separated from the release shaft 58, its diameter is reduced by the urging force, and grips the neck portion 50 of the weight body 48.
この錘体４８にはばね座４２との間に小圧縮コイルばね
６０が介在されており、錘体４８を固定筒３４の先端部
へと付勢して受圧板３０へ打撃させるようになっている
。A small compression coil spring 60 is interposed between the weight body 48 and the spring seat 42, and urges the weight body 48 toward the tip of the fixed cylinder 34 to strike the pressure receiving plate 30. There is.
固定筒３４の外周には検出手段を構成するコイル６２が
巻回されており、リード線６４により制御装置へと接続
されている。このリードＷＡ６２は固定筒３４内を移動
する錘体４８の打撃速度及び打撃後の反発速度を磁束密
度の変化により検出でさ、制御装置がこれを測定記録す
るようになっている。A coil 62 constituting a detection means is wound around the outer periphery of the fixed cylinder 34, and is connected to a control device by a lead wire 64. This lead WA62 detects the impact speed of the weight body 48 moving within the fixed cylinder 34 and the repulsion speed after impact by changes in magnetic flux density, and the control device measures and records this.
測定に当たっては、測定装置１ｏをケース１８へ取りつ
け、このケース１８を第１図に示される如く型枠１４の
窓１６へと対応させる。For measurement, the measuring device 1o is attached to a case 18, and the case 18 is made to correspond to the window 16 of the formwork 14 as shown in FIG.
移動筒３６を把持し、これを大圧縮コイルばね４０の付
勢力に抗して固定筒３４の軸方向へ移動させるとチャッ
ク４６は付勢力で錘体４８の首部５０へと入り込む。When the movable barrel 36 is gripped and moved in the axial direction of the fixed barrel 34 against the biasing force of the large compression coil spring 40, the chuck 46 enters the neck portion 50 of the weight body 48 due to the biasing force.
従ってこの状態で移動筒３６の把持を解除すれば、移動
筒３６は大圧縮コイルばね４ｏの付勢力で固定筒３４か
ら抜きだされ、打撃可能状態となる。Therefore, if the grip on the movable barrel 36 is released in this state, the movable barrel 36 is pulled out from the fixed barrel 34 by the biasing force of the large compression coil spring 4o, and becomes ready for impact.
この移動時にチャック４６も移動筒３６と共に移動する
為、錘体４８は小圧縮コイルばね６ｏの付勢力に抗して
持ち上げられ、打撃可能状態となる。During this movement, the chuck 46 also moves together with the movable cylinder 36, so the weight body 48 is lifted against the biasing force of the small compression coil spring 6o, and becomes ready for impact.
ここで解除釦５４をばね座３８内へ押し込むと、解除軸
５８はチャック４６を拡開するため、錘体４８の挟持が
解除され、錘体４８は小圧縮コイルばね６０の付勢力で
受圧板３０へと打撃される。Here, when the release button 54 is pushed into the spring seat 38, the release shaft 58 expands the chuck 46, so the clamping of the weight body 48 is released, and the weight body 48 is pushed into the pressure receiving plate by the biasing force of the small compression coil spring 60. Hit to 30.
この打撃速度はコイル６２の磁束密度変化によって測定
される。This striking speed is measured by the change in magnetic flux density of the coil 62.
受圧板３０へ打撃された錘体４８は反発して逆方向に移
動するが、この反発速度はコンクリート１２の圧縮強度
に応じて変化する。この反発速度は打撃速度と同様にコ
イル６２の磁束密度変化で測定される。The weight body 48 hit against the pressure receiving plate 30 rebounds and moves in the opposite direction, but the speed of this rebound changes depending on the compressive strength of the concrete 12. This repulsion speed is measured by the change in magnetic flux density of the coil 62, similar to the impact speed.
打撃時に袋ナツト２２内の弾性膜２８は打撃力を受けて
微少移動するが、周囲が袋ナツト２２へ取りつけられて
いる構成であるため、打撃方向に抵抗が小さなものとな
っている。さらに弾性膜２８はケース２４内を密閉構造
として防塵機能を向上している。At the time of impact, the elastic membrane 28 inside the cap nut 22 moves slightly due to the impact force, but since the periphery is attached to the cap nut 22, the resistance in the direction of impact is small. Furthermore, the elastic membrane 28 has a sealed structure inside the case 24 to improve the dustproof function.
第４図には打撃速度と反発速度との比である反発構造に
対する圧縮強度の測定結果が示されている。これによれ
ば反発硬度と圧縮硬度との比はほぼ直線的に変化してお
り、圧縮強度ｙ （Ｋｇ／Ｃａ ）は（ａＸ＋ｂ）で示
される。ここにａ−７゜２２、ｂ＝０．０７であり、Ｘ
は反発硬度である。FIG. 4 shows the measurement results of the compressive strength for the repulsion structure, which is the ratio of the impact speed to the repulsion speed. According to this, the ratio of rebound hardness to compression hardness changes almost linearly, and the compressive strength y (Kg/Ca) is expressed as (aX+b). Here a-7°22, b=0.07, and X
is the rebound hardness.
従って打撃速度と反発速度との比を求めることにより圧
縮強度を容易に測定することができる。Therefore, the compressive strength can be easily measured by determining the ratio between the impact speed and the rebound speed.
特に本実施例では、錘体４８を直接コンクリート！２へ
打撃せずに受圧板３０を介して打撃させることによりコ
ンクリート表面の強度が平均化して測定されることにな
る。即ちコンクリート１２は一般的に複合材料であり、
表面にはセメント、細骨材、粗骨材が局所的に見て不均
一に分散し、さらにエアーボイドや施工不良等により表
面が粗面化している。従って受圧板３０は錘体４８を介
して打撃することにより表面が平均化されることになり
、正確な圧縮強度が測定できる。In particular, in this embodiment, the weight body 48 is directly made of concrete! By striking through the pressure receiving plate 30 without striking the concrete surface 2, the strength of the concrete surface is averaged and measured. That is, the concrete 12 is generally a composite material;
Cement, fine aggregate, and coarse aggregate are locally dispersed unevenly on the surface, and the surface is roughened due to air voids, poor construction, etc. Therefore, the surface of the pressure receiving plate 30 is averaged by being hit through the weight body 48, and the compressive strength can be measured accurately.
さらに上記実施例では袋ナツト２２とケース２４との間
に弾性膜２８が設けられ、これによって固定筒３４内が
気密状態に保持されているため、コンクリート１２の表
面が湿潤状態でかつ粉塵が多い場合にもこれらに影舌さ
れない正確な測定が可能となっている。Furthermore, in the embodiment described above, the elastic membrane 28 is provided between the cap nut 22 and the case 24, and this keeps the inside of the fixed cylinder 34 in an airtight state, so that the surface of the concrete 12 is wet and has a lot of dust. Accurate measurements are possible without being affected by these conditions.
このようにして測定されたコンクリート１２の表面が充
分な圧縮強度を有している場合には、コンクリート１２
から型枠１４をスリップさセ、さらにコンクリート１２
の上部へこの型枠１４を取りつけ、コンクリート１２の
上部へ順次コンクリートを打設することができる。If the surface of the concrete 12 measured in this way has sufficient compressive strength, the concrete 12
Then slip the formwork 14 and then concrete 12.
This formwork 14 is attached to the upper part of the concrete 12, and concrete can be sequentially poured onto the upper part of the concrete 12.
なお本発明は上記工法に限らず、ＮＡＴＭＴ法、−ｉ的
な左官仕上げ時、床にコンクリートを打設する場合等の
如くコンクリートの強度測定に広く適用可能である。Note that the present invention is not limited to the above-mentioned method, but can be widely applied to the measurement of the strength of concrete, such as the NATMT method, -i plastering, and when pouring concrete onto a floor.
以上説明した如く本発明に係るコンクリート圧縮強度測
定方法では、コンクリートへ受圧板を密着させ、この受
圧板へ錘体を打撃させ、この打撃速度と反発速度との比
によりコンクリート圧縮強度を求め、また本発明に係る
コンクリート圧縮強度測定装置ではコンクリート表面へ
の当接用受圧板とこの受圧板への打撃用錘体と、この錘
体を受圧板へ打撃する弾性体と、この弾性体のエネルギ
蓄積状態を保持するラッチ手段と、前記受圧板への錘体
打撃速度及び反発速度を検出する検出手段とを有するの
で、容易かつ正確に若材令コンクリートの圧縮強度を測
定することができる優れた効果を有する。As explained above, in the concrete compressive strength measuring method according to the present invention, a pressure receiving plate is brought into close contact with the concrete, a weight is struck against the pressure receiving plate, and the concrete compressive strength is determined by the ratio of the striking speed to the repulsion speed. The concrete compressive strength measuring device according to the present invention includes a pressure plate for contacting the concrete surface, a weight body for striking the pressure plate, an elastic body for striking the weight body against the pressure plate, and an energy storage device for the elastic body. Since it has a latch means for holding the state and a detection means for detecting the speed of impact of the weight on the pressure receiving plate and the speed of repulsion, it has an excellent effect of being able to easily and accurately measure the compressive strength of young concrete. has.
第１図は本発明に係るコンクリート圧縮強度測定方法及
び装置の実施例による測定状態を示す断面図、第２図は
測定装置の一部断面拡大図、第３図は測定装置の断面図
、第４図は反発硬度と圧縮強度との関係を示す線図であ
る。
ｌＯ・・・測定装置、
１２・・・コンクリート、
３０・・・受圧板、
４８・・・錘体、
６２・・・コイル。FIG. 1 is a sectional view showing a measurement state according to an embodiment of the method and device for measuring concrete compressive strength according to the present invention, FIG. 2 is an enlarged partial sectional view of the measuring device, and FIG. 3 is a sectional view of the measuring device. FIG. 4 is a diagram showing the relationship between rebound hardness and compressive strength. lO... Measuring device, 12... Concrete, 30... Pressure receiving plate, 48... Weight body, 62... Coil.
Claims (2)
錘体を打撃させ、この打撃速度と反発速度との比により
コンクリートの圧縮強度を求めることを特徴としたコン
クリート圧縮強度測定方法。(1) A concrete compressive strength measuring method characterized by bringing a pressure receiving plate into close contact with concrete, causing a weight to strike the pressure receiving plate, and determining the compressive strength of the concrete from the ratio of the striking speed to the repulsion speed.
板への打撃用錘体と、この錘体を受圧板へ打撃する弾性
体と、この弾性体のエネルギ蓄積状態を保持するラッチ
手段と、前記受圧板への錘体打撃速度及び反発速度を検
出する検出手段とを有することを特徴としたコンクリー
ト圧縮強度測定装置。(2) A pressure plate for contacting the concrete surface, a weight for striking the pressure plate, an elastic body for striking the weight against the pressure plate, and a latch means for maintaining the energy storage state of the elastic body. and a detection means for detecting a weight impact speed and a repulsion speed on the pressure receiving plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21194684A JPS6190037A (en) | 1984-10-09 | 1984-10-09 | Method and device for measuring compressive strength of concrete |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21194684A JPS6190037A (en) | 1984-10-09 | 1984-10-09 | Method and device for measuring compressive strength of concrete |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6190037A true JPS6190037A (en) | 1986-05-08 |
Family
ID=16614311
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21194684A Pending JPS6190037A (en) | 1984-10-09 | 1984-10-09 | Method and device for measuring compressive strength of concrete |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6190037A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6318240A (en) * | 1986-07-10 | 1988-01-26 | Nippon Telegr & Teleph Corp <Ntt> | Scleroscope measure with angle self-correcting function |
| JP2002267583A (en) * | 2001-03-09 | 2002-09-18 | Fuji Tekku Kk | Compression strength estimation method for concrete and compression strength estimation method for concrete of structure |
| KR20020086836A (en) * | 2002-09-12 | 2002-11-20 | 서 치 호 | The face hitting rebound test machine for nondestructive test of concrete compressive strength |
| WO2011046687A1 (en) * | 2009-10-16 | 2011-04-21 | The Boeing Company | Damage impactor |
| JP2014237217A (en) * | 2013-06-07 | 2014-12-18 | サンドビック．マイニング．アンド．コンストラクション．オイ | Arrangement and method in rock breaking |
-
1984
- 1984-10-09 JP JP21194684A patent/JPS6190037A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6318240A (en) * | 1986-07-10 | 1988-01-26 | Nippon Telegr & Teleph Corp <Ntt> | Scleroscope measure with angle self-correcting function |
| JPH0444226B2 (en) * | 1986-07-10 | 1992-07-21 | Nippon Telegraph & Telephone | |
| JP2002267583A (en) * | 2001-03-09 | 2002-09-18 | Fuji Tekku Kk | Compression strength estimation method for concrete and compression strength estimation method for concrete of structure |
| KR20020086836A (en) * | 2002-09-12 | 2002-11-20 | 서 치 호 | The face hitting rebound test machine for nondestructive test of concrete compressive strength |
| WO2011046687A1 (en) * | 2009-10-16 | 2011-04-21 | The Boeing Company | Damage impactor |
| JP2014237217A (en) * | 2013-06-07 | 2014-12-18 | サンドビック．マイニング．アンド．コンストラクション．オイ | Arrangement and method in rock breaking |
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