CN112881156B - Nondestructive detector for strength of lightweight aggregate concrete - Google Patents
Nondestructive detector for strength of lightweight aggregate concrete Download PDFInfo
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- CN112881156B CN112881156B CN202110240698.4A CN202110240698A CN112881156B CN 112881156 B CN112881156 B CN 112881156B CN 202110240698 A CN202110240698 A CN 202110240698A CN 112881156 B CN112881156 B CN 112881156B
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- 238000001514 detection method Methods 0.000 abstract description 7
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000005381 potential energy Methods 0.000 description 2
- 238000010079 rubber tapping Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000009659 non-destructive testing Methods 0.000 description 1
- 238000009527 percussion Methods 0.000 description 1
- 238000000275 quality assurance Methods 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
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Classifications
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- 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
- G01N3/02—Details
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- 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
- G01N3/02—Details
- G01N3/06—Special adaptations of indicating or recording means
- G01N3/062—Special adaptations of indicating or recording means with mechanical indicating or recording means
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- 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
- G01N3/40—Investigating hardness or rebound hardness
- G01N3/52—Investigating hardness or rebound hardness by measuring extent of rebound of a striking body
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- 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
- G01N2203/0058—Kind of property studied
- G01N2203/0076—Hardness, compressibility or resistance to crushing
- G01N2203/0083—Rebound strike or reflected energy
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- 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
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/0605—Mechanical indicating, recording or sensing means
Abstract
The invention discloses a nondestructive detector for the strength of lightweight aggregate concrete, which belongs to the field of concrete quality detection and comprises a shell, wherein a detachable upper end plug is arranged at the top of the shell, a lower end plug is arranged at the bottom of the shell, a fixed plate is arranged on the outer side wall of the top of the shell, a central guide rod is arranged at the bottom of the fixed plate, an elastic hammer is sleeved on the outer side wall of the central guide rod in a sliding manner, a convex block is fixedly connected to the outer side wall of the elastic hammer, and a movable opening a corresponding to the convex block is arranged on the outer side wall of the shell. According to the invention, the T-shaped limiting block and the limiting spring a are arranged on the outer side wall of the shell, when the pointer block reaches a certain position, the T-shaped limiting block can be pressed into the shell by pressing the T-shaped limiting block towards the shell to limit the pointer block, and when the pointer block is prevented from moving to the position where the pointer block is observed, the position of the pointer block is prevented from being generated, so that detection errors are prevented.
Description
Technical Field
The invention relates to the field of concrete quality detection, in particular to a nondestructive detector for the strength of lightweight aggregate concrete.
Background
As is well known, the strength and quality of concrete are related to the overall safety and service life of a building structure, and therefore, the quality control, quality supervision and quality detection of concrete are very important in the whole life cycle of a building. The springback method is widely applied to construction engineering due to simple operation, convenient use, economy, rapidness and quite high detection precision.
In recent years, lightweight aggregate concrete has been widely used in various fields of construction engineering due to its characteristics of light weight, high strength, good heat insulation effect, excellent fire resistance and durability, and the like. At present, lightweight aggregate concrete has become an important concrete building material. However, the research of the nondestructive testing technology for the lightweight aggregate concrete is almost blank at present, and the performance of the lightweight aggregate concrete is greatly different from that of the common concrete.
In the process of impacting the concrete surface by the aid of the resiliometer, the impact energy (nominal energy (0.50J +/-0.1000J)) of the resiliometer mainly comprises three parts: the energy absorbed to cause plastic deformation of the concrete; the concrete, the elastic striking rod and the elastic striking hammer generate elastic deformation work; the rebound energy.
It is proved by a lot of experimental studies that the work of elastically deforming concrete, a striking rod and a striking hammer is nearly constant under a certain impact energy, and therefore, the rebound distance depends on the plastic deformation of the concrete. Generally, when the strength grade is the same, the lightweight aggregate concrete has lower elastic modulus, lower strength and poor compactness compared with the common concrete, if a common concrete resiliometer (the nominal energy is not less than 2.207J) is adopted to impact the surface of the lightweight aggregate concrete, the plastic deformation of the lightweight aggregate concrete is inevitably larger, and the following rebound is influenced, and the correlation between the rebound value and the strength is poor due to the rebound energy (namely, the rebound value is smaller).
If the strength of the lightweight aggregate concrete is detected by adopting a common concrete resiliometer, a large error is inevitably generated, and great hidden danger is brought to the engineering quality. Therefore, it is necessary to develop a resiliometer specially suitable for detecting the strength of the structural lightweight aggregate concrete aiming at the characteristics of the lightweight aggregate concrete, so as to provide reliable quality assurance for the lightweight aggregate concrete engineering.
Through retrieval, chinese patent application publication No. CN111220450A discloses a light aggregate concrete strength nondestructive detector, which comprises a fastening nut, a zero set screw, a hook cylindrical pin, a button, a casing, a spring hammer, a spring seat, a snap ring, a seal ring, a spring rod, a front cover, a buffer pressure spring, a scale, a pointer piece, a pointer block, a pointer shaft, a center guide rod, a guide flange, a hook pressure spring, a pressure spring and a tail cover, wherein (1) the technical scheme limits each component, and the length of the spring, the impact length of the spring, the take-off position of the spring hammer, the rigidity of the spring, the spherical radius of the front end of the spring rod, the length of the pointer and the friction force are correspondingly improved, so that the whole detector has the function of detecting the light aggregate concrete strength. (2) The invention is more suitable for lightweight aggregate concrete in the aspect of measuring the resilience and has higher strength measurement precision. (3) The lightweight aggregate concrete resiliometer designed by the invention obtains more reasonable and uniform distribution of the rebound values on lightweight aggregate concrete with different strengths, and has more obvious correlation with the surface hardness and the actual compressive strength of the lightweight aggregate concrete. (4) The distribution of resilience values is more dispersed and uniform when different concrete is rebounded in the structure, and the relevance of a concrete strength measuring curve established by proper nominal energy is better. (5) When the radius of the spherical surface at the top end of the elastic striking rod is smaller, the absorption energy of the concrete surface is large, the rebound value is low, the detection precision is reduced, the test angle deviation of the resiliometer during use is easily caused, and when the radius of the spherical surface at the top end of the elastic striking rod is larger, the absorption energy of the concrete surface is smaller. Therefore, the utility model discloses the instrument is decided the bullet pole spherical radius between 24-26mm, has both guaranteed the interval rationality of resilience value, and the operation of being convenient for again reduces test angle deviation.
However, the strength nondestructive detector has a complex structure, when the position of the impact hammer needs to be reset, the buffering pressure spring needs to be extruded, the impact tension spring needs to be stretched, the impact hammer needs to be reset more difficultly, meanwhile, a device for temporarily fixing the pointer block does not exist on the nondestructive detector, when the nondestructive detector needs to be moved to the position of the pointer block observed from other places, the position of the pointer block cannot be temporarily fixed, and errors of data detected by the detector easily occur.
To this end, we propose a lightweight aggregate concrete strength nondestructive detector to solve the above problems.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a nondestructive detector for the strength of lightweight aggregate concrete.
In order to achieve the purpose, the invention adopts the following technical scheme:
a nondestructive detector for the strength of lightweight aggregate concrete comprises a shell, wherein a detachable upper end plug is installed at the top of the shell, a lower end plug is installed at the bottom of the shell, a fixed plate is installed on the outer side wall of the top of the shell, a central guide rod is installed at the bottom of the fixed plate, an elastic hammer is sleeved on the outer side wall of the central guide rod in a sliding mode, a convex block is fixedly connected to the outer side wall of the elastic hammer, a movable opening a corresponding to the convex block is formed in the outer side wall of the shell, and a limiting mechanism a used for fixing the elastic hammer is installed on the shell;
the utility model discloses a pointer, including center guide arm, lower extreme end cap, pointer piece, buffer spring, shell, the bottom of center guide arm slides and has cup jointed the striking pole, the top of striking pole is provided with the sliding tray that corresponds with the center guide arm, the interior bottom of sliding tray passes through buffer spring and is connected with the bottom of center guide arm, the bottom of striking pole runs through the lower extreme end cap and extends toward the bottom of lower extreme end cap, the lower extreme end cap slides and cup joints on the lateral wall of striking pole, the top of lower extreme end cap is connected with the top of striking hammer through the extension spring of striking, the bottom of fixed plate is connected with the inside wall of shell through the pointer axle, the pointer piece has been cup jointed in the slip on the lateral wall of pointer axle, the pointer piece contacts with the striking hammer through the pointer piece, the lateral wall of shell is fixed to be provided with and is used for the stop gear b that corresponds to the pointer piece.
Preferably, the top of the upper end plug is provided with a fixing ring.
Preferably, stop gear a is including inserting the gag lever post of establishing on the shell, the one end of gag lever post runs through the shell and contacts with the impact hammer, be provided with the through-hole that corresponds with the gag lever post on the shell, be provided with the spacing slot that corresponds with the gag lever post on the impact hammer, the shell passes through spacing spring a and is connected with the fixed block, spacing spring a sets up on the lateral wall of gag lever post.
Preferably, the limiting mechanism b comprises a T-shaped limiting block, a movable opening b corresponding to the T-shaped limiting block is arranged on the outer side wall of the shell, and two ends of the T-shaped limiting block are connected with the outer side wall of the shell through limiting springs b.
Preferably, a viewing window is arranged on the outer side wall of the shell.
Preferably, a graduated scale is arranged on the outer side wall of the observation window.
The technical scheme provided by the embodiment of the invention has the following beneficial effects:
1. compared with the prior art, the convex block is arranged on the outer side wall of the elastic hammer, when the position of the elastic hammer needs to be reset, the convex block only needs to be moved upwards, the limiting rod is pulled towards the direction far away from the central guide rod, after the position of the elastic hammer rises to a certain height, the fixed block is loosened, the limiting rod is driven by the elastic potential energy of the limiting spring a to limit the elastic hammer, the elastic hammer is not required to be pressed into the shell, and the reset adjustment mode of the elastic hammer in the detector is simple;
2. compared with the prior art, the outer side wall of the shell is provided with the T-shaped limiting block and the limiting spring a, when the pointer block reaches a certain position, the T-shaped limiting block is pressed towards the direction of the shell to press the T-shaped limiting block into the shell to limit the pointer block, and when the pointer block is prevented from moving to the position where the pointer block is observed, the position of the pointer block is prevented from being generated, and detection errors are prevented.
Drawings
FIG. 1 is a schematic structural diagram of a nondestructive detector for strength of lightweight aggregate concrete according to the present invention;
fig. 2 is a schematic diagram of the internal structure of a lightweight aggregate concrete strength nondestructive detector provided by the invention.
In the figure: 1. a housing; 2. an upper end plug; 3. a lower end plug; 4. a fixing plate; 5. a center guide bar; 6. a limiting rod; 7. a limiting spring a; 8. a fixed block; 9. a percussion hammer; 10. the tension spring is flicked; 11. a tapping rod; 12. a buffer spring; 13. a pointer shaft; 14. a pointer block; 15. a pointer sheet; 16. a T-shaped limiting block; 17. a limiting spring b; 18. a bump; 19. an observation window; 20. a graduated scale.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Referring to fig. 1-2, a nondestructive detector for the strength of lightweight aggregate concrete comprises a shell 1, wherein a detachable upper end plug 2 is installed at the top of the shell 1, a lower end plug 3 is installed at the bottom of the shell 1, a fixed plate 4 is installed on the outer side wall of the top of the shell 1, a central guide rod 5 is installed at the bottom of the fixed plate 4, an elastic hammer 9 is slidably sleeved on the outer side wall of the central guide rod 5, a convex block 18 is fixedly connected to the outer side wall of the elastic hammer 9, a movable opening a corresponding to the convex block 18 is formed in the outer side wall of the shell 1, and a limiting mechanism a for fixing the elastic hammer 9 is installed on the shell 1;
the bottom of central guide arm 5 slides and has cup jointed impact rod 11, the top of impact rod 11 is provided with the sliding tray that corresponds with central guide arm 5, the interior bottom of sliding tray passes through buffer spring 12 and is connected with the bottom of central guide arm 5, the bottom of impact rod 11 runs through lower extreme end cap 3 and extends down the bottom of lower extreme end cap 3, lower extreme end cap 3 slides and cup joints on the lateral wall of impact rod 11, the top of lower extreme end cap 3 is connected with the top of impact hammer 9 through impact extension spring 10, the bottom of fixed plate 4 is connected with the inside wall of shell 1 through pointer axle 13, the slip has cup jointed pointer piece 14 on the lateral wall of pointer axle 13, pointer piece 14 contacts with impact hammer 9 through pointer piece 15, the fixed stop gear b that is used for corresponding pointer piece 14 that is provided with of the lateral wall of shell 1.
More specifically, the top of the upper end plug 2 is provided with a fixing ring.
More specifically, stop gear a is including inserting gag lever post 6 on establishing shell 1, and the one end of gag lever post 6 runs through shell 1 and contacts with elastic hammer 9, is provided with the through-hole that corresponds with gag lever post 6 on the shell 1, is provided with the spacing slot that corresponds with gag lever post 6 on the elastic hammer 9, and shell 1 is connected with fixed block 8 through spacing spring a7, and spacing spring a7 sets up on the lateral wall of gag lever post 6.
More specifically, stop gear b includes T type stopper 16, is provided with the activity mouth b that corresponds with T type stopper 16 on the lateral wall of shell 1, and the both ends of T type stopper 16 all are connected with the lateral wall of shell 1 through spacing spring b 17.
More specifically, a viewing window 19 is provided on the outer side wall of the housing 1.
More specifically, a scale 20 is provided on an outer side wall of the observation window 19.
More specifically, the rigidity of the spring-loaded tension spring 10 is 178 +/-30.0N/m.
More specifically, the invention further provides that the impact length of the tapping rod 11 is 75.0 +/-0.3 mm.
More specifically, the present invention has a further technical solution that the scale 20 at the take-off position of the impact hammer 9 is marked with "0" + 1.
More specifically, the invention further provides that the sliding friction force of the pointer block 14 is 0.5 +/-0.1N. The device is used for measuring the loss of a small part of impact kinetic energy caused by the movement of the pointer block on the pointer shaft.
More specifically, the invention further provides that the mass of the impact hammer 9 is 145 +/-2 g.
In the invention, when the lightweight aggregate concrete strength nondestructive detector is required to be used for detecting the concrete strength, the fixing block 8 is pulled towards the direction far away from the shell 1, so that the limit rod 6 is separated from the elastic hammer 9, the elastic hammer 9 moves towards the elastic hammer 11, the elastic hammer 9 is in contact with the elastic hammer 11 and rebounds, the pointer block 14 is driven to move on the outer side wall of the pointer shaft 13 after rebounding, the T-shaped limit block 16 is pressed towards the shell 1 after the elastic hammer 9 stops moving, the position of the pointer block 14 is kept, then the position of the pointer block 14 is observed, when the position of the elastic hammer 9 is required to be reset, the lug 18 is only required to be moved upwards, the limit rod 6 is pulled towards the direction far away from the central guide rod 5, and when the position of the elastic hammer 9 is raised to a certain height, the fixing block 8 is loosened, the limit rod 6 is driven by the elastic potential energy of the limit spring a7 to limit the elastic hammer 9, the resetting and adjusting mode of the elastic striking hammer 9 in the detector is simple without pressing the elastic striking rod 11 into the shell.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (4)
1. The utility model provides a nondestructive detector of lightweight aggregate concrete strength, includes shell (1), its characterized in that, detachable upper end cap (2) is installed at the top of shell (1), lower extreme end cap (3) are installed to the bottom of shell (1), fixed plate (4) are installed to the top lateral wall of shell (1), central guide arm (5) are installed to the bottom of fixed plate (4), the lateral wall of central guide arm (5) slides and has cup jointed impact hammer (9), the lateral wall fixedly connected with lug (18) of impact hammer (9), the lateral wall of shell (1) is provided with the expansion joint a that corresponds with lug (18), install the stop gear an that is used for fixing impact hammer (9) on shell (1);
the limiting mechanism a comprises a limiting rod (6) inserted on the shell (1), one end of the limiting rod (6) penetrates through the shell (1) and is in contact with the elastic hammer (9), a through hole corresponding to the limiting rod (6) is formed in the shell (1), a limiting slot corresponding to the limiting rod (6) is formed in the elastic hammer (9), the shell (1) is connected with the fixing block (8) through a limiting spring a (7), and the limiting spring a (7) is arranged on the outer side wall of the limiting rod (6);
the bottom of center guide arm (5) slides and is cup jointed and hits pole (11), the top of hitting pole (11) is provided with the sliding tray that corresponds with center guide arm (5), the interior bottom of sliding tray passes through buffer spring (12) and is connected with the bottom of center guide arm (5), the bottom of hitting pole (11) runs through lower extreme end cap (3) and extends towards the bottom of lower extreme end cap (3), lower extreme end cap (3) slides and is cup jointed on the lateral wall of hitting pole (11), the top of lower extreme end cap (3) is connected with the top of hitting hammer (9) through hitting extension spring (10), the bottom of fixed plate (4) is connected with the inside wall of shell (1) through pointer axle (13), pointer block (14) has been cup jointed in the slip on the lateral wall of pointer axle (13), pointer block (14) contacts with hitting hammer (9) through pointer piece (15), the outer side wall of the shell (1) is fixedly provided with a limiting mechanism b used for corresponding to the pointer block (14);
the limiting mechanism b comprises a T-shaped limiting block (16), a movable opening b corresponding to the T-shaped limiting block (16) is arranged on the outer side wall of the shell (1), and two ends of the T-shaped limiting block (16) are connected with the outer side wall of the shell (1) through limiting springs b (17).
2. A nondestructive detector for strength of lightweight aggregate concrete according to claim 1, characterized in that a fixing ring is installed on the top of the upper end plug (2).
3. A nondestructive detector for strength of lightweight aggregate concrete according to claim 1, characterized in that the outer side wall of the housing (1) is provided with a viewing window (19).
4. A nondestructive detector for strength of lightweight aggregate concrete according to claim 3 wherein a scale (20) is provided on the outer side wall of the observation window (19).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110240698.4A CN112881156B (en) | 2021-03-04 | 2021-03-04 | Nondestructive detector for strength of lightweight aggregate concrete |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110240698.4A CN112881156B (en) | 2021-03-04 | 2021-03-04 | Nondestructive detector for strength of lightweight aggregate concrete |
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| Publication Number | Publication Date |
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| CN112881156A CN112881156A (en) | 2021-06-01 |
| CN112881156B true CN112881156B (en) | 2022-04-05 |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2379797Y (en) * | 1998-03-12 | 2000-05-24 | 中国建筑科学研究院建筑结构研究所 | Resiliometer for measuring strength of strong concrete |
| CN2781355Y (en) * | 2005-03-29 | 2006-05-17 | 张荣成 | High strength concrete resiliometer |
| CN200989872Y (en) * | 2006-12-29 | 2007-12-12 | 河南农业大学 | High precision electronic concrete resiliometer |
| CN103149104A (en) * | 2013-02-04 | 2013-06-12 | 中电投工程研究检测评定中心 | Strength detection device of structural member |
| CN204630859U (en) * | 2015-04-28 | 2015-09-09 | 武汉市瑞坤经济发展有限责任公司 | 4.5 joules of high strength concrete resiliometers |
| CN204679359U (en) * | 2015-05-27 | 2015-09-30 | 武汉市瑞坤经济发展有限责任公司 | 4.5J high strength concrete resiliometer |
| CN205593869U (en) * | 2016-05-17 | 2016-09-21 | 天津市津维电子仪表有限公司 | Novel concrete resiliometer excels in |
| CN107817183A (en) * | 2017-08-10 | 2018-03-20 | 上海多克实业有限公司 | A kind of single activation instrument |
| CN111220450A (en) * | 2019-12-31 | 2020-06-02 | 云南大学 | Nondestructive detector for strength of lightweight aggregate concrete |
-
2021
- 2021-03-04 CN CN202110240698.4A patent/CN112881156B/en not_active Expired - Fee Related
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2379797Y (en) * | 1998-03-12 | 2000-05-24 | 中国建筑科学研究院建筑结构研究所 | Resiliometer for measuring strength of strong concrete |
| CN2781355Y (en) * | 2005-03-29 | 2006-05-17 | 张荣成 | High strength concrete resiliometer |
| CN200989872Y (en) * | 2006-12-29 | 2007-12-12 | 河南农业大学 | High precision electronic concrete resiliometer |
| CN103149104A (en) * | 2013-02-04 | 2013-06-12 | 中电投工程研究检测评定中心 | Strength detection device of structural member |
| CN204630859U (en) * | 2015-04-28 | 2015-09-09 | 武汉市瑞坤经济发展有限责任公司 | 4.5 joules of high strength concrete resiliometers |
| CN204679359U (en) * | 2015-05-27 | 2015-09-30 | 武汉市瑞坤经济发展有限责任公司 | 4.5J high strength concrete resiliometer |
| CN205593869U (en) * | 2016-05-17 | 2016-09-21 | 天津市津维电子仪表有限公司 | Novel concrete resiliometer excels in |
| CN107817183A (en) * | 2017-08-10 | 2018-03-20 | 上海多克实业有限公司 | A kind of single activation instrument |
| CN111220450A (en) * | 2019-12-31 | 2020-06-02 | 云南大学 | Nondestructive detector for strength of lightweight aggregate concrete |
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