KR20090017770A - The face hitting rebound test machine for nondestructive test of concrete compressive strength - Google Patents

The face hitting rebound test machine for nondestructive test of concrete compressive strength Download PDF

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Publication number
KR20090017770A
KR20090017770A KR1020070082176A KR20070082176A KR20090017770A KR 20090017770 A KR20090017770 A KR 20090017770A KR 1020070082176 A KR1020070082176 A KR 1020070082176A KR 20070082176 A KR20070082176 A KR 20070082176A KR 20090017770 A KR20090017770 A KR 20090017770A
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KR
South Korea
Prior art keywords
concrete pavement
impact
hammer
repulsion
tester
Prior art date
Application number
KR1020070082176A
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Korean (ko)
Inventor
박대근
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(사)한국도로교통협회
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Priority to KR1020070082176A priority Critical patent/KR20090017770A/en
Publication of KR20090017770A publication Critical patent/KR20090017770A/en

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M7/00—Vibration-testing of structures; Shock-testing of structures
    • G01M7/08—Shock-testing
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/04—Analysing solids
    • 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
    • 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; ceramics; glass; bricks
    • G01N33/383—Concrete, cement
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0014—Type of force applied
    • G01N2203/0016—Tensile or compressive
    • G01N2203/0019—Compressive
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/003—Generation of the force
    • G01N2203/0032—Generation of the force using mechanical means
    • G01N2203/0039—Hammer or pendulum

Abstract

The present invention is to determine the degree of concrete homogeneity of the existing concrete pavement or to determine the degree of deterioration, and to measure the change of concrete pavement over time after the concrete pavement in the construction site and to remove the formwork and scaffolding accordingly In the non-destructive test used to predict the timing, it relates to the surface impact rebound tester for estimating the compressive strength of concrete pavement.

Description

The face hitting rebound test machine for nondestructive test of concrete compressive strength}

The present invention is to determine the degree of concrete homogeneity of the existing concrete pavement or to determine the degree of deterioration, and to measure the change of concrete pavement over time after the concrete pavement in the construction site and to remove the formwork and scaffolding accordingly In the non-destructive test used to predict the timing, it relates to the surface impact rebound tester for estimating the compressive strength of concrete pavement.

Recently, the maintenance and reinforcement technology of the structure has been made a lot of materials and methods, and the development of new technology is steadily being made. However, the diagnosis techniques that should be preceded by such reinforcement reinforcement techniques have been applied to the conventional techniques developed in the past 1950 ~ 1960 as they are. The focus is on convenience.

At present, non-destructive testing method for estimating the compressive strength of concrete pavement is widely used by the method of measuring surface repulsion by Schmidthammer and ultrasonic test by ultrasonic method.

Among them, the measurement of surface repulsion using the Schmidt hammer estimates the compressive strength by measuring the rebound amount by the hammer in the interior hitting the impact flanger by the compression of the spring. At this time, the end of the impact flanger is processed into a curved surface, so the hitting using the Schmidt hammer is basically introduced the concept of point hitting.

Since Schmitthammer has a small impact point, the impact force is not transmitted to the inside of the concrete pavement, so it is not only to measure the total repulsive force of the overall material of the concrete pavement, but only the repulsive force of the surface of the concrete pavement. Therefore, the integrated measurement of concrete pavement as cement composite is not made and the average of the measured data at each point is regarded as the resilience of concrete pavement. In other words, the measured value with and without aggregate on the surface of concrete pavement means that there is a deviation. Finally, estimating the compressive strength with partial surface repulsion of concrete pavement has a problem that the correlation decreases. There is no choice but to have.

In addition, since Schmitthammer has a small impact point, if the foreign matter is stuck on the concrete pavement surface, the measurement error is very large. However, many concrete pavements are often overlaid with cement paste or finished with paint, so when measuring surface resilience for these areas, it is difficult to remove cement paste or paint, but in reality it is difficult to completely remove them. Even if it is completely removed, there is a problem that it must be repaired after measurement.

In particular, the Schmidt hammer is a deviation of the measured value depending on the shape and properties of the concrete pavement surface hitting, the presence or absence of aggregates, the presence of rebar, the degree of processing of the hitting surface. In order to reduce the error of these measurements, about 20 multi-point strikes are carried out, and the average of the remaining values is calculated except for the data with large errors. Therefore, there is a problem that a lot of effort is administered to obtain the data of the measurement surface. In addition, in the case of Schmidt hammer, the measured value changes according to the angle of attack. When hitting at right angles, when hitting 45 °, and hitting -90 °, the measured value changes, and each time the angle changes little, the measured value changes simultaneously. At present, an auxiliary device has been developed to maintain the angle of the Schmitthammer hitting, but it is cumbersome and inconvenient in use, and is not used in reality, and most hitting is carried out depending on the user's sense. Therefore, in the actual concrete pavement resilience measurement work, an error occurs in the blow angle little by little each time the strike, and when the change of the angle occurs in this way, the reliability of the data is degraded. This is a problem that occurs because it is difficult to maintain a constant measuring angle since the Schmidt hammer is basically a point hitting.

The present invention was derived to solve the problems according to the prior art described above, comprising the shape of the impact flanger of the resilience tester for estimating the compressive strength of concrete pavement to increase the diameter of the compression spring and to reduce the number of windings By increasing the compressive force and increasing the impact force, it is possible to measure the integrated resilience of the concrete pavement composites, and to easily estimate the compressive strength of the concrete pavement in the existing concrete pavement or construction site through the non-destructive inspection method. It is an object of the present invention to provide a surface strike repulsion tester. Important technical tasks required to achieve this purpose include the following.

(1) Measurement of resilience suitable for material properties of concrete pavement

(2) Maintaining the angle of blow for accurate concrete pavement repulsion measurement

(3) Saving effort and time required for non-destructive testing of concrete pavement compressive strength

In the case of (1), each component of the concrete pavement, which is a cement composite, should be included simultaneously in the resilience measurement site so that the compressive strength performance of the integrated concrete pavement can be measured. Therefore, the present invention is characterized in that by forming the shape of the impact flanger of the repulsion tester as shown in Figure 4 to measure the integrated resilience in consideration of the material properties of the concrete pavement concrete cement.

In the case of (2), since the shape of the impact flanger forms a plane that can be in close contact with the concrete pavement surface, the impact angle of the repulsion tester can always be perpendicular to the concrete pavement surface. There is a characteristic that no error of data occurs.

In the case of (3), the resilience can be measured in consideration of the material properties of the concrete pavement, thereby reducing the measurement error of the resilience test, and measuring the resilience against the non-dot surface. Repulsion test can be performed.

As a result, it is possible to reduce the number of hits, which is a feature to reduce the effort and time required for non-destructive testing of concrete pavement compressive strength.

In order to achieve the above object, the surface impact rebound tester according to the embodiment of the present invention, in the rebound tester for evaluating the performance and quality of the concrete pavement by a non-destructive test method, the back cover 7 and the felt A housing (3) made of a cylindrical body surrounded by a washer (12) to receive components therein; and a compression spring (5) mounted at a rear portion of the housing (3) to generate a strong compression force: the compression spring A detent 8 for holding the compression force generated by (5) up to a predetermined position and allowing the compression force to be driven; and actuated by the compression force generated by the action of the compression spring 5 to effect the impact flanger 1 Hammer (9) and transmitting the impact force to the): the impact force of the hammer (9) in close contact with the concrete pavement surface (2) to transfer into the concrete pavement, resulting in the concrete pavement internal stress It can be used to detect the repulsion degree, and it is formed as a face so that it is always at right angles to the concrete pavement surface (2) to prevent errors due to the change of measurement angle when measuring the rebound degree and to accurately measure the resilience. Impact flanger (1) formed in the surface and: the impact spring (10) for pushing up the hammer (9) by transmitting the repulsion degree detected to the impact flanger (1) formed in the surface again: the impact spring (4) and: instructions for operating the hammer (9) pushed up by the force of (10) to indicate the degree of rebound of the concrete pavement so that the data can be recognized. Scale plate 11 indicating the degree of size and: Pusher for temporarily fixing the guide (4) so that the position of the guide (4) does not change according to the state of the rebound tester when reading the size of the scale plate (11) It is characterized by consisting of the tongue (6).

According to the present invention, the form of the impact flanger of the resilience tester for estimating the compressive strength of concrete pavement is formed into a surface, and the impact force is increased by increasing the compressive force by increasing the diameter of the compression spring and reducing the number of turns. It is about a testing machine.

According to the present invention is expected to have the following effects in technical and economic aspects.

Technically, unlike the existing point hitting repulsion tester, the advanced face hitting repulsion tester was invented to perform non-destructive test suitable for the material properties of concrete pavement. As a result, it is possible to clarify the analysis on the performance of concrete pavement and the judgment on the quality of the concrete pavement, so that it is possible to accurately judge the reinforcement and dismantlement of existing structures. It has the effect of enabling scientific analysis of the condition.

On the economic side, it is possible to reduce the effort and time required for the resilience test and increase the efficiency of measurement, thereby reducing the input of technical manpower required for the diagnosis of the structure, thereby securing economic feasibility as well as domestic construction. The large amount of rebound tester used in the field, the supervision company, and the safety diagnosis company relies on imports from abroad, thus replacing the rebound tester market with one side of the imported test equipment.

In the following, embodiments of the present invention are described with reference to the accompanying drawings.

In the following description of the present invention, if it is determined that detailed descriptions of related known functions or configurations may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted. In addition, the terms to be described later are terms set in consideration of functions in the present invention, and these terms may vary according to the intention or custom of the producer producing the product, and the definition of the terms should be made based on the contents throughout the present specification.

(Example)

Hereinafter, the technical configuration of the present invention will be described in detail with reference to the accompanying drawings shown in FIGS. 1 to 6.

Figure 1 (a) is a cross-sectional view of the inside of the surface impact repulsion tester according to the present invention showing the name and configuration of the components, (b) is a view showing a cross section of the impact flanger formed of the surface. The face impact repulsion tester shown in (a) is made of a cylindrical body surrounded by a rear cover 7 and a felt washer 12 and a housing 3 for receiving components therein and a rear portion of the housing 3. A compression spring 5 mounted on the support spring 5 and a detent 8 for supporting the compression force generated by the compression spring 5 to a predetermined position and driving the compression force 5 and the compression spring 5 The hammer (9) and the impact force of the hammer (9) which is operated by the compressive force generated by the action of the impact to the impact flanger (1) to the concrete pavement surface (2) in close contact with the concrete pavement, and As a result, it is possible to detect the repulsion degree of the internal stress caused by the concrete pavement, and it is formed as a face to maintain the state perpendicular to the concrete pavement surface (2) at all times. Push back the hammer (9) by transferring the detected repulsion to the hammer (9) to the impact flanger (1) formed in the face and the impact flanger (1) formed in the face to prevent the error and to accurately measure the resilience Instructions (4) to be operated by the driving of the impact spring (10) and the hammer (9) pushed up by the force of the impact spring 10 to indicate the degree of rebound of the concrete pavement so that the data can be recognized In order to read the size of the scale plate 11 and the scale plate 11 indicating the size of the data indicated by the guideline and the guideline temporarily so that the position of the guideline 4 does not change according to the state of the repulsion tester. It shows that it consists of the push button 6 which fixes (4).

2 (a), (b), (c) illustrates the concept of hitting the surface repulsion rebound tester step by step compression spring (5) and hammer (9), impact spring (10) and impact flanger (1) ) And the relationship between the concrete pavement surface (2) is shown through the compression action by the compression spring (5), the degree of compression force and the impact spring (10) to transmit the impact force.

Figure 3 (a) is the impact force of the existing repulsion tester is transmitted to the interior of the concrete pavement shows a stress distribution diagram to resist the concrete pavement, (b) the impact of the surface impact repulsion tester is transmitted to the interior of the concrete pavement The concrete pavement shows a stress distribution that resists it. Existing repulsion tester measures the resilience of concrete pavement by point hitting, so it hits the part formed with cement compound and the part with coarse aggregate separately and measures resilience by the average value. The amount of force transmitted also has a very small range. On the other hand, the surface impact repulsion tester measures the resilience of the concrete pavement by the surface strike, so that the force is transmitted to the wide and deep parts of the concrete pavement and the stress distribution is formed, thus reflecting the material characteristics of the integrated concrete pavement. The repulsion can be measured.

The lower part is machined to face the impact flanger (1) part of the resilience tester so that the resilience of the concrete pavement can be measured by the impact force of the compression spring (5). When the surface (2) is in close contact with each other for measurement, it is possible to maintain the right angle at all times, thereby preventing errors due to the change of the measurement angle when measuring the rebound, and measuring the rebound.

Figure 4 shows how to measure the resilience of the concrete pavement using this surface hitting repulsion tester. (a) and (b) are conceptual diagrams showing the measuring method. Referring to the measurement method with reference to the name of the parts specified in Figure 1, as shown in Figs. 4 (a) and 4 (b) the impact flanger (1) formed in the surface close to the concrete pavement surface (2) to be measured Mounting the repulsion tester at right angles to the concrete pavement surface (2) and compressing the repulsion tester to push the hammer (9) while the compression spring (5) inside the repulsion tester contracts. The compression spring (5), which was supported by 8) has a step of transmitting the kinetic energy to the hammer (9) as the detent (8) is released and the hammer (9) is impacted by the force of the compression spring (5). (1) the step of hitting hard and the impact flanger (1) hit by the hammer (9) to transmit the impact force to the concrete pavement and the repulsive force is transmitted to the impact flanger (1) inside the concrete pavement Transferring to the shock spring 10 Step and push the hammer 9 upward by the action of the impact spring 10, and move the instructions 4 on the guide rod 4 as the hammer 9 springs up by the repulsive force of the concrete pavement. After pressing the button (6) to fix the guide (4) and read the data of the scale plate (11), the step of recording the rebound measure of the concrete pavement using the surface impact repulsion tester is made.

As described above, when the surface impact repulsion tester according to the present invention is applied to the concrete pavement compressive strength nondestructive test, the resilience of the concrete pavement due to the surface impact is measured, and thus the material characteristics of the concrete pavement of the cement composite are tested. The concrete pavement resilience as an integrated material can be measured, and the cement and coarse aggregate parts of the concrete are simultaneously measured at the same time, so the effort and time required to hit several times to average the rebound data. Can be reduced. In addition, since the resilience is measured by the surface hitting, the impact force transmitted by the surface hitting is transmitted to the deep part of the concrete pavement, so that a wider range of resilience can be measured. I can figure it out.

The embodiments of the present invention have been described above with reference to the accompanying drawings.

However, it is to be noted that the present invention is not particularly limited only to the above-described embodiments, and that various modifications and changes can be made by those skilled in the art within the spirit and spirit of the appended claims as necessary.

1 is a cross-sectional view of the surface impact repulsion tester and a cross-sectional view of the impact flanger

Figure 2 is a blow conceptual view of the surface hitting rebound tester

3 is a stress distribution diagram of the surface impact repulsion tester

Figure 4 is an exemplary view of the measurement method of the surface impact repulsion tester

<Explanation of symbols for main parts of drawing>

1. Impact flanger 2. Concrete pavement surface

3. Housing 4. Instructions and guide rod

5. Compression spring 6. Pushbutton

7. Back cover 8. Detent

9. Hammer 10. Impact spring

11.Diameter Plate 12.Felt Washers

Claims (1)

In the resilience tester for evaluating the performance and quality of concrete pavement by nondestructive testing method, A housing (3) made of a cylindrical body surrounded by a rear cover (7) and a felt washer (12) to receive components therein; A compression spring 5 mounted on the rear of the housing 3 to generate a strong compression force: A detent 8 for supporting the compression force generated by the compression spring 5 to a certain position and then driving the compression force: The hammer (9) and actuated by the compression force generated by the action of the compression spring (5) to transmit the impact force to the impact flanger (1): The hammering force of the hammer (9) is in close contact with the concrete pavement surface (2) to be transmitted to the interior of the concrete pavement, to detect the repulsion of the stress generated by the concrete pavement caused by this, is formed into a surface of the concrete pavement surface ( 2) The impact flanger (1) formed with a surface to prevent errors due to the change of the measurement angle and to accurately measure the resilience by maintaining the right angle at the same time as 2): The impact spring (10) for pushing up the hammer (9) by transmitting the repulsion degree detected to the impact flanger (1) formed in the surface again to the hammer (9) and: Instructions (4) and actuated by the driving of the hammer (9) pushed up by the force of the impact spring (10) to indicate the degree of rebound of the concrete pavement so that the data can be recognized: A scale plate 11 indicating the size of the data indicated by the above instructions: Surface hitting, characterized in that consisting of a push button (6) to temporarily fix the guide (4) so that the position of the guide (4) does not change depending on the state of the rebound tester when reading the size of the scale plate (11) Repulsion tester.
KR1020070082176A 2007-08-16 2007-08-16 The face hitting rebound test machine for nondestructive test of concrete compressive strength KR20090017770A (en)

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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102507354A (en) * 2011-10-13 2012-06-20 中国航天科技集团公司第四研究院四0一所 Device and method for testing rebound rate of sealing ring
CN104251802A (en) * 2013-06-26 2014-12-31 名硕电脑(苏州)有限公司 Key resilience time measurement apparatus and measurement method thereof
CN106679912A (en) * 2016-12-30 2017-05-17 长安大学 Electromagnetic-driven lossless resiliometer and measuring method of the same
CN108007658A (en) * 2017-12-27 2018-05-08 舟山市博远科技开发有限公司 A kind of detection device of the spring assembly of reisilometer
CN109111177A (en) * 2018-11-19 2019-01-01 宁夏大学 Desert sand concrete and tensile strength lossless detection method after by high temperature
CN109556946A (en) * 2018-06-13 2019-04-02 乐陵市回弹仪厂 Slider assembling machine structure on reisilometer
CN112765874A (en) * 2020-12-31 2021-05-07 盾构及掘进技术国家重点实验室 Method and device for obtaining surrounding rock parameters suitable for open type TBM tunnel
RU206169U1 (en) * 2019-11-25 2021-08-26 Федеральное государственное казенное военное образовательное учреждение высшего образования "ВОЕННАЯ АКАДЕМИЯ МАТЕРИАЛЬНО-ТЕХНИЧЕСКОГО ОБЕСПЕЧЕНИЯ имени генерала армии А.В. Хрулева" Министерства обороны Российской Федерации Rebound pressure control device
CN113670754A (en) * 2021-09-06 2021-11-19 中国化学工程第三建设有限公司 Electromagnetic power concrete quality detection resiliometer device
CN114279872A (en) * 2021-12-23 2022-04-05 南通科创建设工程检测有限公司 Centrifugal concrete strength detection device and detection process thereof
CN116399740A (en) * 2023-05-31 2023-07-07 山西八建集团有限公司 On-spot acceptance device of building construction material
CN109556946B (en) * 2018-06-13 2024-05-03 乐陵市回弹仪厂 Slider assembly mechanism for resiliometer

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102507354B (en) * 2011-10-13 2014-04-02 中国航天科技集团公司第四研究院四0一所 Device and method for testing rebound rate of sealing ring
CN102507354A (en) * 2011-10-13 2012-06-20 中国航天科技集团公司第四研究院四0一所 Device and method for testing rebound rate of sealing ring
CN104251802A (en) * 2013-06-26 2014-12-31 名硕电脑(苏州)有限公司 Key resilience time measurement apparatus and measurement method thereof
CN106679912A (en) * 2016-12-30 2017-05-17 长安大学 Electromagnetic-driven lossless resiliometer and measuring method of the same
CN108007658B (en) * 2017-12-27 2023-12-08 舟山市博远科技开发有限公司 Detection device for spring assembly of resiliometer
CN108007658A (en) * 2017-12-27 2018-05-08 舟山市博远科技开发有限公司 A kind of detection device of the spring assembly of reisilometer
CN109556946A (en) * 2018-06-13 2019-04-02 乐陵市回弹仪厂 Slider assembling machine structure on reisilometer
CN109556946B (en) * 2018-06-13 2024-05-03 乐陵市回弹仪厂 Slider assembly mechanism for resiliometer
CN109111177A (en) * 2018-11-19 2019-01-01 宁夏大学 Desert sand concrete and tensile strength lossless detection method after by high temperature
RU206169U1 (en) * 2019-11-25 2021-08-26 Федеральное государственное казенное военное образовательное учреждение высшего образования "ВОЕННАЯ АКАДЕМИЯ МАТЕРИАЛЬНО-ТЕХНИЧЕСКОГО ОБЕСПЕЧЕНИЯ имени генерала армии А.В. Хрулева" Министерства обороны Российской Федерации Rebound pressure control device
CN112765874B (en) * 2020-12-31 2023-09-26 盾构及掘进技术国家重点实验室 Method and device for acquiring surrounding rock parameters applicable to open TBM tunnel
CN112765874A (en) * 2020-12-31 2021-05-07 盾构及掘进技术国家重点实验室 Method and device for obtaining surrounding rock parameters suitable for open type TBM tunnel
CN113670754B (en) * 2021-09-06 2023-08-04 中国化学工程第三建设有限公司 Electromagnetic power concrete quality detection resiliometer device
CN113670754A (en) * 2021-09-06 2021-11-19 中国化学工程第三建设有限公司 Electromagnetic power concrete quality detection resiliometer device
CN114279872A (en) * 2021-12-23 2022-04-05 南通科创建设工程检测有限公司 Centrifugal concrete strength detection device and detection process thereof
CN116399740A (en) * 2023-05-31 2023-07-07 山西八建集团有限公司 On-spot acceptance device of building construction material
CN116399740B (en) * 2023-05-31 2023-08-15 山西八建集团有限公司 On-spot acceptance device of building construction material

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