CN116539463B - Concrete strength detection method - Google Patents
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- CN116539463B CN116539463B CN202310727607.9A CN202310727607A CN116539463B CN 116539463 B CN116539463 B CN 116539463B CN 202310727607 A CN202310727607 A CN 202310727607A CN 116539463 B CN116539463 B CN 116539463B
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- G—PHYSICS
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- 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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- 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
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Abstract
The invention relates to the technical field of concrete strength detection, in particular to a method for detecting concrete strength, which comprises the following steps: s1, detecting the strength of each point to be detected on the concrete by an intensity rebound instrument; s2, a heavy hammer in the intensity resiliometer is used for knocking each point to be tested in sequence, and the rebound distance of the heavy hammer after knocking each point to be tested is recorded respectively; s3, calculating a plurality of variances for the point to be tested to determine whether to replace a spring with a corresponding elastic coefficient for driving the heavy hammer; s4, judging whether to correct or reselect the preset rebound distance according to the measured average rebound distance for the point to be tested when the strength of the point to be tested does not meet the preset standard; and S5, outputting a detection result of the concrete strength. The invention avoids the problem that the accuracy of the measured concrete strength is insufficient and the deviation exists between the measured concrete strength and the actual strength due to the adoption of the same standard in the process of detecting the concrete strength.
Description
Technical Field
The invention relates to the technical field of concrete strength detection, in particular to a method for detecting concrete strength.
Background
The rebound method is one of important detection methods for detecting the strength of concrete, and is mainly used for estimating the compressive strength of a concrete member according to the relation between the hardness and the strength of the surface of the concrete member.
Chinese patent application No.: the invention discloses a method for detecting the compressive strength of concrete by combining rebound, which comprises the following steps of: step 1, a matrix of medium rebound tester measuring points and high-strength rebound tester measuring points is established on a concrete member to be tested; step 2, detecting data of the high-strength rebound instrument measuring points and the medium rebound instrument measuring points of the matrix; step 3, collecting the detected data and screening the collected data; step 4, establishing a structural concrete combined rebound method strength measurement curve applicable to the strength range of 20.0 MPa-100.0 MPa according to the screened data; the invention adopts the combination rebound of the medium rebound device and the high-strength rebound device to detect the compressive strength of the concrete, thereby not only realizing the rebound method detection by the rebound devices with two energies in the same area, but also improving the detection precision of the compressive strength of the concrete; it follows that the method for detecting the compressive strength of concrete by combined rebound has the following problems: the adoption of the same standard in the process of detecting the strength of the concrete leads to insufficient accuracy of the strength of the concrete to be detected, and deviation exists between the accuracy and the actual strength.
Disclosure of Invention
Therefore, the invention provides a method for detecting the strength of concrete, which is used for solving the problems that in the prior art, the same standard is adopted in the process of detecting the strength of concrete, so that the accuracy of the strength of the concrete is insufficient and the deviation exists between the measured strength and the actual strength.
In order to achieve the above object, the present invention provides a method for detecting the strength of concrete, comprising:
s1, placing concrete to be tested at a preset position, marking a plurality of points to be tested on the surface of the concrete to be tested, detecting crack distribution density in the concrete by an ultrasonic detector, and detecting the strength of each point to be tested on the concrete by using a strength rebound instrument when judging that the crack distribution density in the concrete is qualified;
step S2, a central control module controls a heavy hammer in the intensity rebound instrument to strike each point to be tested in sequence and records rebound distances of the heavy hammer after striking each point to be tested respectively, and for a single point to be tested, the central control module controls the heavy hammer to strike the point to be tested for multiple times to obtain a plurality of rebound distances aiming at the point to be tested and judges whether the intensity of concrete at the point to be tested meets a preset standard according to each rebound distance;
step S3, when the central control module judges that the intensity of a single point to be detected in the concrete meets a preset standard, calculating a plurality of variances for the point to be detected so as to judge whether to replace a spring with a corresponding elastic coefficient for driving the heavy hammer, and when the replacement of the spring is completed, judging whether the intensity of the concrete at the point to be detected meets the standard again;
step S4, when the central control module judges that the intensity of a single point to be detected in the concrete does not meet a preset standard, judging whether to correct the preset rebound distance or reselect the point to be detected according to the measured average rebound distance aiming at the point to be detected so as to judge whether the intensity of the point corresponding to the concrete surface meets the standard again;
and S5, after the central control module completes the judgment of whether the strength of each point in each concrete meets the preset standard, determining the comprehensive strength of the concrete by combining each judgment result, and outputting a detection result for the concrete strength after the determination is completed.
Further, in the step S2, when the central control module completes the acquisition of the rebound distances of the points to be tested, sequentially calculating an average value of the rebound distances of the points to be tested and calculating an intensity evaluation value for the concrete according to the average value, and the central control module preliminarily determines whether the intensity of the concrete is qualified according to the intensity evaluation value, wherein:
the first preliminary judgment mode is that the central control module judges that the strength of the concrete is qualified, calculates the obtained variances of the rebound distances, judges whether the elastic coefficient of a spring in the strength rebound instrument is regulated according to the obtained variances, and judges whether the strength of the point to be detected meets the standard or not for the second time; the first preliminary judgment mode satisfies that the intensity evaluation value S is larger than a first preset intensity evaluation value S1;
the second preliminary judgment mode is that the central control module judges that the strength of the concrete is unqualified, and adjusts the first preset strength evaluation value S1 and the second preset strength evaluation value S2 to corresponding values according to the average value C of the rebound distance so as to judge whether the strength of the point to be detected meets the standard or not for the second time; the second preliminary determination mode satisfies that the intensity evaluation value S is smaller than or equal to the first preset intensity evaluation value S1 and larger than the second preset intensity evaluation value S2;
the third preliminary judgment mode is that the central control module judges that the strength of the concrete is unqualified, adjusts the distribution distance of each point to be tested according to the difference value of the strength evaluation value S and the second preset strength evaluation value S3, and judges whether the strength of the concrete accords with a standard according to the strength evaluation value obtained again after adjustment; the third preliminary determination mode satisfies that the intensity evaluation value S is smaller than or equal to the second preset intensity evaluation value S2 and larger than the third preset intensity evaluation value S3;
the fourth preliminary judgment mode is that the central control module judges that the strength of the concrete does not accord with the standard; the fourth preliminary determination means satisfies that the intensity evaluation value S is equal to or smaller than a third preset intensity evaluation value S3.
Further, when the ultrasonic detector detects crack distribution density in concrete and the central control module records that rebound distances of the heavy hammer after knocking each point to be detected are completed respectively, the central control module determines an intensity evaluation value S of the concrete according to rebound distance C of a single point to be detected by the ultrasonic detector and crack distribution density P in the concrete detected by the ultrasonic detector, S=a×C+b×P is set, wherein a is a rebound distance weight coefficient, b is a crack distribution density weight coefficient, 0.1 < a < 0.6,0.4 < b < 0.9 is set, and a+b=1.
Further, the central control module calculates a variance Q of each rebound distance for the point to be measured in the first preliminary determination mode, and the central control module determines an adjustment mode for adjusting an elastic coefficient of a spring of the intensity resiliometer according to the variance Q, wherein:
the first adjusting mode is that the central control module adjusts the elastic coefficient of the spring by using a first adjusting coefficient alpha 1, the central control module records the adjusted elastic coefficient of the spring as K1, and K1 = K0 multiplied by alpha 1 is set, wherein K0 is the initial elastic coefficient of the spring; the first adjustment mode meets the condition that the variance Q is larger than or equal to a preset variance Q0;
the second adjusting mode is that the central control module adjusts the elastic coefficient of the spring by using a second adjusting coefficient alpha 2, the central control module marks the elastic coefficient of the adjusted spring as K2, and K2=K0×alpha 2 is set; the second adjustment mode satisfies that the variance Q is smaller than a preset variance Q0;
and when the central control module finishes the adjustment of the elastic coefficient of the spring, the original spring in the intensity rebound instrument is replaced by the spring with the corresponding elastic coefficient.
Further, the central control module controls the intensity rebound instrument to re-detect the position to be detected when the replacement of the spring with the corresponding elastic coefficient is completed, so as to calculate an intensity evaluation value S' of the concrete according to the measured rebound distance, and judge whether the intensity of the concrete is qualified according to the intensity evaluation value, wherein:
the first qualification judging mode is that the central control module judges that the strength of the concrete is qualified, and ultrasonic detection is carried out on crack distribution density in the concrete, wherein the first qualification judging mode meets the condition that the strength evaluation value S' is larger than the first preset strength evaluation value S1;
the second qualification judging mode is that the central control module judges that the strength of the concrete is unqualified, and a preliminary judging mode for the concrete is determined according to the strength evaluation value; the second qualification mode satisfies that the intensity evaluation value S' is less than or equal to the first preset intensity evaluation value S1.
Further, when the ultrasonic detection is completed on the crack distribution density in the concrete by the central control module, calculating the variation z of the crack distribution density according to the detection result, and setting z=p1-P, wherein P1 is the crack distribution density in the concrete after the detection of the concrete by using the intensity rebound instrument, and P is the crack distribution density in the concrete before the detection of the concrete by using the intensity rebound instrument, and the central control module judges whether the intensity of the concrete is qualified according to the variation z, wherein:
the first judging mode is that the central control module judges that the strength of the concrete is qualified; the first judgment mode meets the condition that the variation z is smaller than or equal to a preset variation z0;
the second judging mode is that the central control module judges that the strength of the concrete does not accord with the standard; the first judgment mode satisfies that the variation z is larger than a preset variation z0.
Further, the central control module calculates a difference value between the intensity evaluation value S and the second preset intensity evaluation value S2 in the second preliminary determination mode, marks the difference value as a first-level intensity difference value Δs, sets Δs=s-S2, and determines a selection mode of selecting a corresponding standard adjustment coefficient to adjust each preset intensity standard according to the first-level intensity difference value, wherein:
the first selection mode is that the central control module selects a first standard adjusting coefficient beta 1 to adjust each preset intensity standard; the first replacement mode meets the condition that a first-level strength difference DeltaS is larger than or equal to a preset strength difference DeltaS 0;
the second mode is that the central control module selects a second standard adjusting coefficient beta 2 to adjust each preset intensity standard; the second replacement mode satisfies that the first-level strength difference DeltaS is smaller than a preset strength difference DeltaS 0.
Further, when the central control module determines that the j-th preset intensity evaluation value Sj is adjusted by using the i-th standard adjustment coefficient βi, setting i=1, 2, j=1, 2,3, recording the adjusted j-th preset intensity evaluation value as Sj ', setting Sj' =sj× (1- (Sj-S)/Sj) ×βi, and performing secondary determination on the intensity of the concrete.
Further, the central control module adjusts the distribution distance of each point to be tested according to the difference value between the intensity evaluation value S and the third preset intensity evaluation value S3 in the third preliminary determination mode, and sets the adjusted distribution distance to l=l0× (1+ (S-S3)/S, where L0 is the initial distribution distance of each point to be tested, and when the adjustment of the distribution distance of each point to be tested is completed, the central control module controls the intensity rebound instrument to re-impact the point to be tested to obtain an average rebound distance for the point to be tested, and recalculates the intensity evaluation value S | according to the average rebound distance to determine whether the intensity of the concrete meets the standard determination mode, where:
the first standard judging mode is that the central control module judges that the strength of the concrete is qualified, and the first standard judging mode meets the condition that the strength evaluation value S is larger than the first preset strength evaluation value S1;
the second standard judging mode is that the central control module judges that the strength of the concrete is unqualified, adjusts the weight of the heavy hammer of the strength rebound instrument, and sets the weight of the adjusted heavy hammer as m=C/C5×m0, wherein m0 is the initial weight of the heavy hammer, and the central control module controls the strength rebound instrument to re-detect the strength of the concrete and secondarily judges the strength of the concrete after the weight of the heavy hammer of the strength rebound instrument is adjusted; and the second standard judgment mode meets the condition that the intensity evaluation value S is less than or equal to the first preset intensity evaluation value S1.
Further, when the intensity rebound device detects that the rebound distance is finished, the central control module calculates an included angle w between the concrete detection surface and the vertical plane to correct the rebound distance, and sets the corrected rebound distance l=l0/cosw.
Compared with the prior art, the method has the beneficial effects that the method obtains the strength evaluation value for the concrete according to the rebound distance and the crack distribution density of each point to be tested on the surface of the concrete according to the strength rebound instrument, determines whether the strength of the concrete meets the preset standard according to the strength evaluation value, judges whether the spring of the strength rebound instrument is replaced or detects the change condition of the crack distribution density in the concrete when the strength of the concrete is primarily judged to meet the preset standard, judges whether the evaluation standard or the distribution of the point to be tested is regulated according to the obtained strength evaluation value when the strength of the concrete is primarily judged to be not met, can effectively avoid inaccurate measured results caused by external environment and misoperation, and effectively improves the detection efficiency of the strength of the concrete while effectively improving the detection accuracy of the strength of the concrete.
Further, the method and the device calculate the strength evaluation value of the concrete by integrating the measured crack distribution density in the concrete and the rebound distance of each point to be measured, improve the control precision of the measured concrete strength result, judge whether the concrete strength meets the standard according to the strength evaluation value, thereby shortening the time for judging whether the concrete strength is qualified after the concrete strength is detected, and further improving the working efficiency of the concrete strength detection process.
Further, whether the strength of the concrete is qualified or not is judged according to the comparison result of the strength evaluation value and the preset evaluation value, and when the strength of the concrete is judged to be unqualified, the preset strength evaluation value or the distribution distance of each point to be tested is regulated, so that the condition that the measured result is inaccurate due to the influence of external environment and misoperation is effectively avoided, and the detection precision of the method for the strength of the concrete is further improved.
Further, the rebound distance is corrected according to the perpendicularity of the concrete detection surface when the detection of the concrete detection surface by the intensity rebound instrument is completed, so that the condition that the measured result is inaccurate due to the fact that the concrete detection surface is not perpendicular to the detection of the intensity rebound instrument is avoided, the detection accuracy of the method for the concrete intensity is improved, and meanwhile the detection efficiency for the concrete intensity is further improved.
Further, the method calculates the variance of each rebound distance measured by the intensity rebound instrument when the intensity of the concrete is preliminarily judged to be qualified, and adjusts the elastic coefficient of the spring according to the variance by using the corresponding adjusting coefficient, so that the condition that the accuracy of the measured intensity of the concrete is insufficient due to the fact that the same standard is adopted in the intensity detection process of the concrete is avoided, and the detection accuracy of the method for the intensity of the concrete is effectively improved, and meanwhile the detection efficiency for the intensity of the concrete is further improved.
Further, when the elastic coefficient of the spring is regulated, ultrasonic detection is carried out on the crack distribution density in the concrete when the strength of the concrete is judged to be qualified, the condition that the measured result is inaccurate due to inconsistent strength of the inner surface and the outer surface of the concrete is avoided, and the detection accuracy of the method for the strength of the concrete is effectively improved, and meanwhile the detection efficiency for the strength of the concrete is further improved.
Further, when the strength of the concrete is preliminarily judged to be unqualified, the corresponding standard adjustment coefficient is adopted to adjust each preset strength evaluation value, so that the control precision of the strength of the concrete is improved, the time of the strength judgment process of the concrete is effectively shortened, and the detection efficiency of the strength of the concrete is further improved.
Further, the method provided by the invention can be used for adjusting the weight of the strength rebound instrument when the strength of the concrete is preliminarily determined to be unqualified, so that the condition that the strength of the concrete to be tested still does not reach the accuracy when the elastic coefficient of the adjusting spring reaches the upper limit is avoided, and the detection accuracy of the method for the strength of the concrete is effectively improved, and meanwhile, the detection efficiency for the strength of the concrete is further effectively improved.
Drawings
FIG. 1 is a flow chart of a method for detecting concrete strength according to the present invention;
FIG. 2 is a flow chart of a preliminary determination mode for determining whether the strength of the concrete is acceptable according to the present invention;
FIG. 3 is a flow chart of the manner in which the spring rate of the spring of the intensity resilient meter is adjusted in accordance with the present invention;
FIG. 4 is a block diagram showing a selection mode of selecting a corresponding standard adjustment coefficient to adjust each preset intensity standard according to the first-level intensity difference determination.
Detailed Description
In order that the objects and advantages of the invention will become more apparent, the invention will be further described with reference to the following examples; it should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are merely for explaining the technical principles of the present invention, and are not intended to limit the scope of the present invention.
Fig. 1 is a flowchart of a method for detecting concrete strength according to an embodiment of the invention.
The method for detecting the strength of the concrete provided by the embodiment of the invention comprises the following steps:
s1, placing concrete to be tested at a preset position, marking a plurality of points to be tested on the surface of the concrete to be tested, detecting crack distribution density in the concrete by an ultrasonic detector, and detecting the strength of each point to be tested on the concrete by using a strength rebound instrument when judging that the crack distribution density in the concrete is qualified;
step S2, a central control module controls a heavy hammer in the intensity rebound instrument to strike each point to be tested in sequence and records rebound distances of the heavy hammer after striking each point to be tested respectively, and for a single point to be tested, the central control module controls the heavy hammer to strike the point to be tested for multiple times to obtain a plurality of rebound distances aiming at the point to be tested and judges whether the intensity of concrete at the point to be tested meets a preset standard according to each rebound distance;
step S3, when the central control module judges that the intensity of a single point to be detected in the concrete meets a preset standard, calculating a plurality of variances for the point to be detected so as to judge whether to replace a spring with a corresponding elastic coefficient for driving the heavy hammer, and when the replacement of the spring is completed, judging whether the intensity of the concrete at the point to be detected meets the standard again;
step S4, when the central control module judges that the intensity of a single point to be detected in the concrete does not meet a preset standard, judging whether to correct the preset rebound distance or reselect the point to be detected according to the measured average rebound distance aiming at the point to be detected so as to judge whether the intensity of the point corresponding to the concrete surface meets the standard again;
and S5, after the central control module completes the judgment of whether the strength of each point in each concrete meets the preset standard, determining the comprehensive strength of the concrete by combining each judgment result, and outputting a detection result for the concrete strength after the determination is completed.
According to the method, the strength evaluation value of the concrete is obtained according to the rebound distance and the crack distribution density of each point to be tested on the surface of the concrete by the strength rebound instrument, whether the strength of the concrete meets the preset standard is determined according to the strength evaluation value, the central control module judges whether the spring of the strength rebound instrument is replaced or detects the change condition of the crack distribution density in the concrete when the strength of the concrete meets the preset standard is primarily judged, and judges whether the evaluation standard or the distribution of the point to be tested is regulated according to the obtained strength evaluation value when the strength of the concrete does not meet the preset standard is primarily judged, so that the condition that the measured result is inaccurate due to the external environment and misoperation can be effectively avoided, and the detection efficiency of the method for the strength of the concrete is effectively improved while the detection precision of the strength of the concrete is effectively improved.
Specifically, when the ultrasonic detector detects crack distribution density in concrete and the central control module records that rebound distances of the heavy hammer after knocking each point to be detected are completed respectively, the central control module determines an intensity evaluation value S of the concrete according to rebound distance C at a single point to be detected by the ultrasonic detector and crack distribution density P in the concrete detected by the ultrasonic detector, S=a×C+b×P is set, wherein a is a rebound distance weight coefficient, b is a crack distribution density weight coefficient, a is set to be more than 0.1 and less than 0.6,0.4 and b is set to be more than 0.9, and a+b=1.
According to the invention, the intensity evaluation value of the concrete is calculated by combining the measured crack distribution density in the concrete and the rebound distance of each point to be measured, the control precision of the measured concrete intensity result is improved, and whether the concrete intensity meets the standard is judged according to the intensity evaluation value, so that the time for judging whether the concrete intensity is qualified after the concrete intensity is detected is shortened, and the working efficiency of the concrete intensity detection process is further improved.
Referring to fig. 2, a flow chart of a preliminary determination method for determining whether the strength of the concrete is acceptable according to the present invention is shown.
Specifically, in the step S2, when the central control module completes the acquisition of the rebound distances of the points to be tested, the central control module sequentially calculates an average value of the rebound distances of the points to be tested and calculates an intensity evaluation value for the concrete according to the average value, and the central control module preliminarily determines whether the intensity of the concrete is qualified according to the intensity evaluation value, where:
the first preliminary judgment mode is that the central control module judges that the strength of the concrete is qualified, calculates the obtained variances of the rebound distances, judges whether the elastic coefficient of a spring in the strength rebound instrument is regulated according to the obtained variances, and judges whether the strength of the point to be detected meets the standard or not for the second time; the first preliminary judgment mode satisfies that the intensity evaluation value S is larger than a first preset intensity evaluation value S1;
the second preliminary judgment mode is that the central control module judges that the strength of the concrete is unqualified, and adjusts the first preset strength evaluation value S1 and the second preset strength evaluation value S2 to corresponding values according to the average value C of the rebound distance so as to judge whether the strength of the point to be detected meets the standard or not for the second time; the second preliminary determination mode satisfies that the intensity evaluation value S is smaller than or equal to the first preset intensity evaluation value S1 and larger than the second preset intensity evaluation value S2;
the third preliminary judgment mode is that the central control module judges that the strength of the concrete is unqualified, adjusts the distribution distance of each point to be tested according to the difference value of the strength evaluation value S and the second preset strength evaluation value S3, and judges whether the strength of the concrete accords with a standard according to the strength evaluation value obtained again after adjustment; the third preliminary determination mode satisfies that the intensity evaluation value S is smaller than or equal to the second preset intensity evaluation value S2 and larger than the third preset intensity evaluation value S3;
the fourth preliminary judgment mode is that the central control module judges that the strength of the concrete does not accord with the standard; the fourth preliminary determination mode satisfies that the intensity evaluation value S is less than or equal to a third preset intensity evaluation value S3;
wherein the first preset intensity evaluation value S1 is 16, the second preset intensity evaluation value S2 is 12, the third preset intensity evaluation value S3 is 9,
according to the method, whether the strength of the concrete is qualified or not is judged according to the comparison result of the strength evaluation value and the preset evaluation value, and when the strength of the concrete is judged to be unqualified, the preset strength evaluation value or the distribution distance of each point to be tested is regulated, so that the condition that the measured result is inaccurate due to the influence of external environment and misoperation is effectively avoided, and the detection precision of the method for the strength of the concrete is effectively improved.
Specifically, when the intensity rebound device detects that the rebound distance is finished, the central control module calculates an included angle w between the concrete detection surface and the vertical plane to correct the rebound distance, and sets the corrected rebound distance l=l0/cosw.
According to the method, when the detection of the concrete detection surface by the intensity rebound instrument is finished, the rebound distance is corrected according to the perpendicularity of the concrete detection surface, so that the condition that the measured result is inaccurate due to the fact that the concrete detection surface is not perpendicular to the detection of the intensity rebound instrument is avoided, the detection precision of the method for the concrete intensity is improved, and meanwhile the detection efficiency for the concrete intensity is effectively improved.
Fig. 3 is a flowchart of an adjustment method of the spring modulus of the spring of the intensity rebound apparatus according to the present invention.
Specifically, the central control module calculates a variance Q of each rebound distance for the point to be measured in the first preliminary determination mode, and determines an adjustment mode for adjusting an elastic coefficient of a spring of the intensity resiliometer according to the variance Q, wherein:
the first adjusting mode is that the central control module adjusts the elastic coefficient of the spring by using a first adjusting coefficient alpha 1, the central control module records the adjusted elastic coefficient of the spring as K1, and K1 = K0 multiplied by alpha 1 is set, wherein K0 is the initial elastic coefficient of the spring; the first adjustment mode meets the condition that the variance Q is larger than or equal to a preset variance Q0;
the second adjusting mode is that the central control module adjusts the elastic coefficient of the spring by using a second adjusting coefficient alpha 2, the central control module marks the elastic coefficient of the adjusted spring as K2, and K2=K0×alpha 2 is set; the second adjustment mode satisfies that the variance Q is smaller than a preset variance Q0;
and when the central control module finishes the adjustment of the elastic coefficient of the spring, the original spring in the intensity rebound instrument is replaced by the spring with the corresponding elastic coefficient.
In the embodiment of the invention, the first adjustment coefficient is 1.3, the second adjustment coefficient is 1.1, and the preset variance Q0 is 0.5.
According to the method, the variance of each rebound distance measured by the strength rebound instrument is calculated when the strength of the concrete is preliminarily judged to be qualified, and the elastic coefficient of the spring is adjusted by using the corresponding adjusting coefficient according to the variance, so that the situation that the accuracy of the measured strength of the concrete is insufficient due to the fact that the same standard is adopted in the strength detection process of the concrete is avoided, and the detection accuracy of the method for the strength of the concrete is effectively improved, and meanwhile the detection efficiency for the strength of the concrete is effectively improved.
Specifically, the central control module controls the intensity resiliometer to re-detect the position to be measured when the replacement of the spring with the corresponding elastic coefficient is completed, so as to calculate an intensity evaluation value S' of the concrete according to the measured rebound distance, and judge whether the intensity of the concrete is qualified according to the intensity evaluation value, wherein:
the first qualification judging mode is that the central control module judges that the strength of the concrete is qualified, and ultrasonic detection is carried out on crack distribution density in the concrete, wherein the first qualification judging mode meets the condition that the strength evaluation value S' is larger than the first preset strength evaluation value S1;
the second qualification judging mode is that the central control module judges that the strength of the concrete is unqualified, and a preliminary judging mode for the concrete is determined according to the strength evaluation value; the second qualification mode satisfies that the intensity evaluation value S' is less than or equal to the first preset intensity evaluation value S1.
When the elastic coefficient of the spring is regulated, the ultrasonic detection is carried out on the crack distribution density in the concrete when the strength of the concrete is judged to be qualified, so that the condition that the measured result is inaccurate due to the fact that the strength of the inner surface and the outer surface of the concrete is inconsistent is avoided, and the detection accuracy of the method for the strength of the concrete is effectively improved, and meanwhile the detection efficiency for the strength of the concrete is effectively improved.
Fig. 4 shows a selection manner of selecting a corresponding standard adjustment coefficient to adjust each preset intensity standard according to the first-level intensity difference determination according to the present invention.
Specifically, the central control module calculates a difference value between the intensity evaluation value S and the second preset intensity evaluation value S2 in the second preliminary determination mode, marks the difference value as a first-level intensity difference value Δs, sets Δs=s-S2, and determines, according to the first-level intensity difference value, a selection mode of selecting a corresponding standard adjustment coefficient to adjust each preset intensity standard, where:
the first selection mode is that the central control module selects a first standard adjusting coefficient beta 1 to adjust each preset intensity standard; the first selection mode meets the condition that the first-level intensity difference DeltaS is larger than or equal to a preset intensity difference DeltaS 0;
the second mode is that the central control module selects a second standard adjusting coefficient beta 2 to adjust each preset intensity standard; the second selection mode satisfies that the first-level intensity difference DeltaS is smaller than the preset intensity difference DeltaS 0.
In the embodiment of the invention, the first standard adjustment coefficient beta 1 is 1.2, the second standard adjustment coefficient beta 2 is 1.1, and the preset intensity difference delta S0 is 1.5.
Specifically, when the central control module determines that the j-th preset intensity evaluation value Sj is adjusted by using the i-th standard adjustment coefficient βi, setting i=1, 2, j=1, 2,3, recording the adjusted j-th preset intensity evaluation value as Sj ', setting Sj' =sj× (1- (Sj-S)/Sj) ×βi, and performing secondary determination on the intensity of the concrete.
According to the invention, when the strength of the concrete is preliminarily judged to be unqualified, the corresponding standard adjustment coefficient is adopted to adjust each preset strength evaluation value, so that the control precision of the strength of the concrete is improved, the time of the strength judgment process of the concrete is effectively shortened, and the detection efficiency of the strength of the concrete is improved.
Specifically, when the ultrasonic detection is completed on the crack distribution density in the concrete by the central control module, calculating the variation z of the crack distribution density according to the detection result, and setting z=p1-P, wherein P1 is the crack distribution density in the concrete after the detection of the concrete by using the intensity rebound instrument, and P is the crack distribution density in the concrete before the detection of the concrete by using the intensity rebound instrument, and the central control module judges whether the intensity of the concrete is qualified or not according to the variation z, wherein:
the first judging mode is that the central control module judges that the strength of the concrete is qualified; the first judgment mode meets the condition that the variation z is smaller than or equal to a preset variation z0;
the second judging mode is that the central control module judges that the strength of the concrete does not accord with the standard; the first judgment mode satisfies that the variation z is larger than a preset variation z0.
In the embodiment of the invention, the preset variation z0 is 2 bars/m.
According to the method, ultrasonic detection is carried out on the crack distribution density in the concrete when the strength of the concrete is primarily judged to be qualified, and secondary judgment is carried out on whether the strength of the concrete is qualified or not according to the variation of the measured crack distribution density, so that the detection accuracy of the method for the strength of the concrete is effectively improved, and meanwhile the detection efficiency for the strength of the concrete is effectively improved.
Specifically, the central control module adjusts the distribution distance of each point to be tested according to the difference value between the intensity evaluation value S and the third preset intensity evaluation value S3 in the third preliminary determination mode, and sets the adjusted distribution distance to l=l0× (1+ (S-S3)/S), where L0 is the initial distribution distance of each point to be tested, and when the adjustment of the distribution distance of each point to be tested is completed, the central control module controls the intensity rebound instrument to re-impact the point to be tested to obtain an average rebound distance for the point to be tested, and recalculates the intensity evaluation value S | according to the average rebound distance to determine whether the intensity of the concrete meets the standard determination mode, where:
the first standard judging mode is that the central control module judges that the strength of the concrete is qualified, and the first standard judging mode meets the condition that the strength evaluation value S is larger than the first preset strength evaluation value S1;
the second standard judging mode is that the central control module judges that the strength of the concrete is unqualified, adjusts the weight of the heavy hammer of the strength rebound instrument, and sets the weight of the adjusted heavy hammer as m=C/C5×m0, wherein m0 is the initial weight of the heavy hammer, and the central control module controls the strength rebound instrument to re-detect the strength of the concrete and secondarily judges the strength of the concrete after the weight of the heavy hammer of the strength rebound instrument is adjusted; and the second standard judgment mode meets the condition that the intensity evaluation value S is less than or equal to the first preset intensity evaluation value S1.
According to the method, when the strength of the concrete is judged to be unqualified preliminarily, the weight of the heavy hammer of the strength rebound instrument is adjusted, the condition that the strength of the concrete to be tested does not reach the accuracy when the elastic coefficient of the adjusting spring reaches the upper limit is avoided, and the detection accuracy of the method for the strength of the concrete is effectively improved, and meanwhile the detection efficiency for the strength of the concrete is effectively improved.
Thus far, the technical solution of the present invention has been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of protection of the present invention is not limited to these specific embodiments. Equivalent modifications and substitutions for related technical features may be made by those skilled in the art without departing from the principles of the present invention, and such modifications and substitutions will be within the scope of the present invention.
The foregoing description is only of the preferred embodiments of the invention and is not intended to limit the invention; various modifications and variations of the present invention will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (2)
1. A method for detecting the strength of concrete, comprising:
s1, placing concrete to be tested at a preset position, marking a plurality of points to be tested on the surface of the concrete to be tested, detecting crack distribution density in the concrete by an ultrasonic detector, and detecting the strength of each point to be tested on the concrete by using a strength rebound instrument when judging that the crack distribution density in the concrete is qualified;
step S2, a central control module controls a heavy hammer in the intensity rebound instrument to strike each point to be tested in sequence and records rebound distances of the heavy hammer after striking each point to be tested respectively, and for a single point to be tested, the central control module controls the heavy hammer to strike the point to be tested for multiple times to obtain a plurality of rebound distances aiming at the point to be tested and judges whether the intensity of concrete at the point to be tested is qualified or not according to each rebound distance;
step S3, when the central control module judges that the strength of a single point to be detected in the concrete is qualified, calculating variances according to a plurality of rebound distances aiming at the point to be detected, judging whether to replace a spring with a corresponding elastic coefficient for driving the heavy hammer according to the variances, and judging whether the strength of the concrete at the point to be detected is qualified again when the replacement of the spring is completed;
step S4, when the central control module judges that the intensity of a single point to be detected in the concrete is unqualified, adjusting a judging reference to a corresponding value according to the average value of the rebound distances so as to judge whether the intensity of the point to be detected is qualified or not, or adjusting the distribution distance of each point to be detected to a corresponding value according to the judging reference and judging whether the intensity of the concrete is qualified again;
s5, after the central control module completes the judgment of whether the strength of each point in each concrete is qualified, determining the comprehensive strength of the concrete by combining each judgment result, and outputting a detection result for the concrete strength after the determination is completed;
when the central control module finishes acquiring the rebound distances of the points to be tested, sequentially calculating an average value of the rebound distances of the points to be tested and calculating an intensity evaluation value of a single point to be tested of the concrete according to the average value, and determining a preliminary determination mode for determining whether the intensity of the concrete at the point to be tested is qualified or not according to the intensity evaluation value, wherein:
the first preliminary judgment mode is that the central control module judges that the strength of a single to-be-detected point position of the concrete is qualified, then calculates the variance of each rebound distance of the obtained single to-be-detected point position, and adjusts the elastic coefficient of a spring in the strength rebound instrument to a corresponding value according to the obtained variance so as to judge whether the strength of the to-be-detected point position is qualified or not for the second time; the first preliminary judgment mode satisfies that the intensity evaluation value S is larger than a first preset intensity evaluation value S1;
the second preliminary judgment mode is that the central control module judges that the strength of a single to-be-detected point of the concrete is unqualified, and the first preset strength evaluation value S1 and the second preset strength evaluation value S2 are adjusted to corresponding values according to the average value C of the rebound distances by selecting corresponding adjustment coefficients so as to carry out secondary judgment on whether the strength of the to-be-detected point is qualified or not; the second preliminary determination mode satisfies that the intensity evaluation value S is smaller than or equal to the first preset intensity evaluation value S1 and larger than the second preset intensity evaluation value S2;
the third preliminary judgment mode is that the central control module judges that the strength of a single to-be-detected point position of the concrete is unqualified, adjusts the distribution distance of each to-be-detected point position according to the difference value of the strength evaluation value S and the second preset strength evaluation value S2, and judges whether the strength of the concrete is qualified according to the strength evaluation value obtained again after adjustment; the third preliminary determination mode satisfies that the intensity evaluation value S is smaller than or equal to the second preset intensity evaluation value S2 and larger than the third preset intensity evaluation value S3;
the fourth preliminary judgment mode is that the central control module judges that the strength of the concrete is unqualified; the fourth preliminary determination mode satisfies that the intensity evaluation value S is less than or equal to a third preset intensity evaluation value S3;
when the ultrasonic detector detects crack distribution density in concrete and the central control module records rebound distances of the heavy hammer after knocking each point to be detected respectively, the central control module determines the strength evaluation value S of the concrete according to an average value C of rebound distances of single point to be detected measured by the strength rebound detector and crack distribution density P of single point to be detected in the concrete measured by the ultrasonic detector, S=a×C+b×P is set, wherein a is a rebound distance weight coefficient, b is a crack distribution density weight coefficient, a is more than 0.1 and less than 0.6,0.4 and less than 0.9, and a+b=1;
the central control module calculates the difference value between the intensity evaluation value S and the second preset intensity evaluation value S2 in the second preliminary judgment mode, marks the difference value as a first-level intensity difference value delta S, sets delta S=S-S2, and selects corresponding standard adjustment coefficients according to the first-level intensity difference value to adjust each preset intensity standard, wherein the mode of selecting the standard adjustment coefficients comprises the following steps:
the first selection mode is that the central control module selects a first standard adjusting coefficient beta 1 to adjust each preset intensity standard; the first selection mode meets the condition that the first-level intensity difference DeltaS is larger than or equal to a preset intensity difference DeltaS 0;
the second mode is that the central control module selects a second standard adjusting coefficient beta 2 to adjust each preset intensity standard; the second selection mode meets the condition that the first-level intensity difference DeltaS is smaller than a preset intensity difference DeltaS 0;
when the central control module judges that the j-th preset intensity evaluation value Sj is adjusted by using the i-th standard adjustment coefficient betai, setting i=1, 2, j=1, 2,3, marking the adjusted j-th preset intensity evaluation value as Sj ', setting Sj' =Sj× (1- (Sj-S)/Sj) ×betai, and carrying out secondary judgment on the intensity of a single point to be measured of the concrete;
the central control module adjusts the distribution distance of each point to be tested according to the difference value of the intensity evaluation value S and the third preset intensity evaluation value S3 in the third preliminary judgment mode, and sets the adjusted distribution distance to be L=L0× (1+ (S-S3)/S), wherein L0 is the initial distribution distance of each point to be tested, the central control module controls the intensity rebound instrument to re-impact each point to be tested after the adjustment of the distribution distance of each point to be tested is completed so as to obtain the average value of the rebound distances of the point to be tested, and recalculates the intensity evaluation value S according to the average value of the rebound distances to determine the standard judgment mode for judging whether the intensity of the single point to be tested of the concrete is qualified, wherein:
the first standard judgment mode is that the central control module judges that the strength of a single concrete point to be detected is qualified, and the first standard judgment mode meets the condition that the strength evaluation value S is larger than the first preset strength evaluation value S1;
the second standard judging mode is that the central control module judges that the strength of a single point to be tested of the concrete is unqualified and adjusts the weight quality of the strength rebound instrument,
the central control module controls the intensity resiliometer to re-detect the intensity of the concrete and judges the intensity of the concrete secondarily after the mass of the heavy hammer of the intensity resiliometer is regulated; the second standard judgment mode meets the condition that the intensity evaluation value S is less than or equal to the first preset intensity evaluation value S1;
the central control module calculates the variance Q of the rebound distances of the points to be detected under the first preliminary judgment mode, and judges the adjustment mode for adjusting the elastic coefficient of the spring of the intensity rebound instrument according to the variance Q, wherein:
the first adjusting mode is that the central control module adjusts the elastic coefficient of the spring by using a first adjusting coefficient alpha 1, the central control module records the adjusted elastic coefficient of the spring as K1, and K1 = K0 multiplied by alpha 1 is set, wherein K0 is the initial elastic coefficient of the spring; the first adjustment mode meets the condition that the variance Q is larger than or equal to a preset variance Q0;
the second adjusting mode is that the central control module adjusts the elastic coefficient of the spring by using a second adjusting coefficient alpha 2, the central control module marks the elastic coefficient of the adjusted spring as K2, and K2=K0×alpha 2 is set; the second adjustment mode satisfies that the variance Q is smaller than a preset variance Q0;
when the central control module finishes the adjustment of the elastic coefficient of the spring, the original spring in the intensity rebound instrument is replaced by a spring with a corresponding elastic coefficient;
the central control module controls the intensity resiliometer to re-detect the position to be detected when the replacement of the spring with the corresponding elastic coefficient is completed, so as to calculate an intensity evaluation value S 'of the concrete according to the measured rebound distance, and determine a qualified judging mode for judging whether the intensity of the concrete is qualified according to the intensity evaluation value S', wherein:
the first qualification judging mode is that the central control module secondarily judges that the strength of a single point to be detected of the concrete is qualified, and ultrasonic detection is carried out on crack distribution density in the concrete, wherein the first qualification judging mode meets the condition that the strength evaluation value S' is larger than the first preset strength evaluation value S1;
the second qualification judging mode is a primary judging mode that the central control module secondarily judges that the strength of the single concrete point to be tested is unqualified, and the step S2 is repeated to redetermine the strength of the single concrete point to be tested according to the strength evaluation value S'; the second qualification mode satisfies that the intensity evaluation value S' is smaller than or equal to the first preset intensity evaluation value S1;
when ultrasonic detection is completed on crack distribution density in concrete by the central control module, calculating variation z of the crack distribution density according to a detection result, and setting z=p1-P, wherein P1 is the crack distribution density in the concrete after the concrete is detected by using an intensity rebound tester, P is the crack distribution density in the concrete before the concrete is detected by using the intensity rebound tester, and the central control module determines a determination mode for determining whether the strength of the concrete is qualified according to the variation z, wherein:
the first judging mode is that the central control module judges that the strength of the concrete is qualified for three times; the first judgment mode meets the condition that the variation z is smaller than or equal to a preset variation z0;
the second judging mode is that the central control module judges that the strength of the concrete is unqualified for three times; the first judgment mode satisfies that the variation z is larger than a preset variation z0.
2. The method according to claim 1, wherein the central control module calculates an angle w between the concrete detection surface and the vertical plane to correct the rebound distance after the completion of the rebound distance l0 detection by the intensity rebound instrument, and sets the corrected rebound distance l=l0/cosw.
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