CN-121856532-A - Real-time monitoring device for concrete hardening process

CN121856532ACN 121856532 ACN121856532 ACN 121856532ACN-121856532-A

Abstract

The invention relates to the technical field of concrete monitoring, in particular to a real-time monitoring device for a concrete hardening process, which comprises a stage identification unit for identifying a state stage of concrete, a state judgment unit for determining that a strain sensor is de-glued based on a non-thermal strain residual error, determining that a humidity sensor is invalid based on a temperature rise time period humidity change relation, determining that a temperature sensor has zero drift based on a net temperature rise and net strain proportion relation, acquiring a thermal risk factor and a shrinkage risk factor based on the net temperature rise and the net strain by a risk factor unit, determining a concrete shrinkage main factor based on the thermal risk factor and the shrinkage risk factor combined with the state stage of the concrete, and adjusting spray power of a spray curing device, wherein a test correction unit is used for adjusting spatial consistency weight and physical association weight of the sensor. The invention aims at the interference adaptability adjustment monitoring strategy of the extreme environment to the sensor monitoring concrete state to improve the detection precision of the sensor.

Inventors

YANG XIAOJUN
LI XIAOCHEN
LUO NING
ZHONG YAN
LI LAICHUN
ZHANG CHENGZHI
JIA SHUYU

Assignees

中交一公局集团有限公司
中交一公局集团有限公司
中交一公局海威工程建设有限公司
中交一公局海威工程建设有限公司

Dates

Publication Date: 20260414
Application Date: 20260210
Priority Date: 20260210

Claims (10)

1. A real-time monitoring device for a concrete hardening process, comprising: the stage identification unit is connected with the monitoring unit and is used for acquiring the net temperature rise and the net strain of the concrete solid structure and extracting key characteristics of the net temperature rise curve and the net strain curve so as to identify the state stage of the concrete; The state judging unit is connected with the stage identifying unit and is used for acquiring a non-thermal strain residual error of the strain sensor by combining the net temperature rise and the net strain, determining that the strain sensor is de-glued based on the non-thermal strain residual error, determining that the humidity sensor is out of function based on the temperature rise period humidity change relation, and determining that the temperature sensor has zero drift based on the proportional relation of the net temperature rise and the net strain; the risk root cause unit is used for acquiring a thermal risk factor and a shrinkage risk factor based on the net temperature rise and the net strain, determining a concrete shrinkage main cause based on the thermal risk factor and the shrinkage risk factor in combination with the state stage of the concrete, and adjusting the spraying power of the spraying maintenance device; the detection and correction unit is provided with a spatial consistency weight and a physical association weight of the sensor in each spatial homogeneous region, and is used for identifying spatial outliers to determine a rolling correlation coefficient with neighboring sensor data, determining a data outlier reason by combining the spatial outlier data and the change trend of the data sum in the spatial homogeneous region, adjusting the spatial consistency weight of the sensor, triggering a humidity response dullness warning based on a net temperature rise rate and a net humidity change, reducing the physical association weight of the corresponding humidity sensor, triggering a strain temperature response failure warning based on the ratio of the net strain and the net temperature rise, and reducing the physical association weight of the strain sensor; The negative feedback unit is connected with the checking and correcting unit and is used for acquiring the comprehensive reliability weight of the sensor based on the spatial consistency weight and the physical association weight of the sensor, determining the reliability of the sensor, and adjusting the risk threshold values of the shrinkage risk factors and the thermal risk factors by combining the state stage of the concrete and the overall data quality index of each spatial homogeneous region, wherein the data quality index is the average value of the comprehensive reliability weights of a plurality of sensors in the spatial homogeneous region.
2. The device for monitoring the hardening process of concrete in real time according to claim 1, wherein the key characteristics comprise a first continuous positive temperature rise rate, a maximum temperature rise rate, a moment when the temperature rise rate approaches zero from positive to negative inflection points; And in a set short time window, the stage identification unit acquires a linear regression slope of the net temperature rise of the entity structure, wherein the linear regression slope continuously exceeds a set positive threshold value to reach a minimum duration period, and the stage identification unit records the linear regression slope as a first continuous positive temperature rise rate.
3. The device for monitoring the hardening process of concrete in real time according to claim 2, wherein if the first continuous positive temperature rise rate is triggered, the stage identifying unit continuously calculates the instantaneous temperature rise rate, takes the maximum value of the instantaneous temperature rise rates as the maximum temperature rise rate, and acquires the maximum temperature rise duration corresponding to the maximum temperature rise rate; If the first continuous positive temperature rise rate is not triggered, the stage identification unit judges that the concrete is in a plastic stage; if the current time length after the first continuous positive temperature rise rate is triggered is smaller than the maximum temperature rise time length, the stage identification unit judges that the concrete is in a hydration acceleration stage; after the temperature rise rate is changed from a positive rotation negative inflection point, the instantaneous temperature rise rate is continuously in a limit interval, and the accumulated duration exceeds a set duration, the stage identification unit judges that the temperature rise process tends to be finished, and the concrete is in a temperature stabilization stage.
4. A real-time monitoring device for concrete hardening process according to claim 3, wherein, If the non-thermal strain residual error of any one strain sensor continuously deviates and the deviation degree increases along with the net temperature rise, the state judging unit judges that the corresponding sensor interface is de-adhered; if the temperature rise value of the net temperature rise in the temperature rise period is larger than the critical temperature rise value, the absolute value of the corresponding humidity slope is smaller than the critical slope and continuously exceeds the fixed time length, the state judging unit judges that the detected temperature and humidity have physical contradiction, and the function of the humidity sensor is invalid; if the actual difference between the actual ratio of the net temperature rise and the net strain and the theoretical ratio is larger than the difference evaluation value, the state judging unit judges that the sensor has zero drift.
5. The real-time monitoring device for concrete hardening process according to claim 4, wherein the mean value and standard deviation of a plurality of non-thermal strain residuals of any one strain sensor are calculated, and if the non-thermal strain residuals exceed a residual threshold range, the state judging unit judges that the non-thermal strain residuals are continuously deviated; And calculating a rolling correlation coefficient of the non-thermal strain residual and the net temperature rise, and if the absolute value of the rolling correlation coefficient is larger than a coefficient threshold value, judging that the deviation degree of the non-thermal strain residual increases along with the net temperature rise by a state judging unit.
6. The device for monitoring the hardening process of concrete in real time according to claim 5, wherein the stage identification unit determines that the concrete is in a hydration peak period when the temperature rise rate is identified to be changed from a positive rotation to a negative rotation after the stage identification unit determines that the concrete is in a hydration acceleration period; after the stage identification unit identifies that the temperature rise rate is changed from a positive rotation negative inflection point, if the maximum temperature rise rate is continuously reduced and the net temperature rise is a positive value, judging that the concrete is in a hydration deceleration stage; if the thermal risk factor is smaller than the first risk threshold and the shrinkage risk factor exceeds the second risk threshold, the risk root cause unit judges that the environmental drying effect is the main cause of shrinkage of the concrete, the environmental wind speed is too high to accelerate surface water evaporation, the drying shrinkage depth is increased, and the spraying power of the spraying maintenance device is increased.
7. The device for monitoring the hardening process of concrete according to claim 6, wherein if any sensor data exceeds the effective range, the inspection and correction unit marks the corresponding sensor as a spatial outlier; If the change trend of the data of the spatial outlier is consistent with the change trend of the data sum of a plurality of sensors in the spatial homogeneous region and the rolling correlation coefficient is larger than a first coefficient threshold value, the checking and correcting unit judges that the data outlier of the sensor is caused by real local abnormality, and the spatial consistency weight of the sensor is unchanged; If the rolling correlation coefficient is smaller than the second coefficient threshold value or the change trend is opposite, the checking and correcting unit judges that the corresponding sensor has own faults, the sensor interface is out of adhesion, the function is out of order or zero drift exists, and the spatial consistency weight of the sensor is reduced.
8. The concrete hardening process real-time monitoring device according to claim 7, wherein the net temperature rise rate is obtained based on a ratio of the net temperature rise to the unit time length; If the net temperature rise rate is greater than the rate threshold and the net humidity change absolute value is continuously smaller than the humidity change threshold, the checking and correcting unit triggers a humidity response dullness warning, and the physical association weight of the corresponding humidity sensor is reduced; If the ratio of the net strain to the net temperature rise continuously exceeds a reasonable ratio range, the checking and correcting unit triggers a strain temperature response mismatch warning, and the physical association weight of the strain sensor is reduced.
9. The concrete hardening process real-time monitoring device according to claim 8, wherein the negative feedback unit obtains the comprehensive credibility weight of the sensor based on the spatial consistency weight and the physical association weight of the sensor; if the comprehensive reliability weight of the sensor is lower than a first weight threshold, the negative feedback unit judges that the reliability of the sensor is low, the data of the sensor does not participate in calculation, and the data representative value of the corresponding point of the sensor is replaced by the data interpolation of the adjacent high-weight sensor; and if the integrated reliability weight of the sensor is greater than the second weight threshold, the negative feedback unit sensor judges that the sensor is a high weight sensor.
10. The concrete hardening process real-time monitoring device according to claim 9, wherein the stage identifying unit identifies that the concrete is in a hydration deceleration period and a temperature stabilization period, and the negative feedback unit reduces a risk threshold of the shrinkage risk factor; The negative feedback unit acquires the overall data quality index of each spatial homogeneous region, wherein the data quality index is the average value of the comprehensive credibility weights of a plurality of sensors in the spatial homogeneous region; The data quality index corresponding to any spatial homogeneous region is smaller than an index threshold, and the negative feedback unit judges that uncertainty exists in monitoring data corresponding to the spatial homogeneous region and improves a risk threshold of the thermally induced risk factor.

Description

Real-time monitoring device for concrete hardening process Technical Field The invention relates to the technical field of concrete monitoring, in particular to a real-time monitoring device for a concrete hardening process. Background Concrete is used as the most widely used building material in the world today, and the quality of its hardening process (i.e. hydration process) directly determines the final mechanical properties, durability and long-term reliability of the structure. The hardening process is not a simple "setting" but a complex physicochemical process involving dynamic interactions of a number of critical parameters such as temperature, humidity, internal stress, microstructure evolution, etc. The traditional concrete hardening process monitoring and quality control method mainly relies on point-type and intermittent on-site monitoring, and an inserted temperature sensor or a sticking surface strain gauge is used for measuring individual points of a structure. The data acquired by the method are local and isolated, the integral hardening condition of mass concrete or complex structure is difficult to comprehensively reflect, monitoring blind areas exist, wiring is tedious, and the wiring is easy to damage in construction. In recent years, with the development of sensing technology, some advanced monitoring technologies begin to be explored and applied, for example, fiber Bragg Grating (FBG) sensors are used for monitoring temperature and strain, or an ultrasonic method and a resistivity method are used for indirectly evaluating strength development, however, the technologies still face various limitations, generally only a single parameter (such as temperature or strain) can be measured, multi-parameter coupling information is difficult to synchronously obtain, hydration process cannot be comprehensively represented, instantaneity and continuity are insufficient, data acquisition frequency of partial technologies is low, or complex external excitation and data processing are needed, and real-time and online monitoring and feedback cannot be realized. Therefore, the prior art lacks an integrated device capable of monitoring the core multidimensional parameters (such as internal temperature field, humidity field, strain/stress development) of the concrete hardening process in real time, synchronously and in situ for a long time, and having high robustness and intelligent analysis function. The defects cause potential problems that the risk of temperature cracks cannot be identified in time, the strength development does not reach the standard, the maintenance condition is unsuitable and the like in the construction process, so that the structure quality is possibly influenced, and even safety accidents are caused. CN120009402a discloses a hardening detection method and system for sprayed concrete, which comprises determining detection requirements based on physical characteristics of sprayed concrete, establishing progressive multi-frequency excitation sequences, monitoring echo signals in the concrete in real time after each multi-frequency excitation, dynamically adjusting excitation parameters according to the quality of the echo signals, preprocessing the acquired echo signals, extracting multidimensional characteristic parameters of the preprocessed echo signals, including time domain characteristics, frequency domain characteristics and energy domain characteristics, forming representative characteristic vectors, removing redundant characteristics according to the characteristic vectors, calculating hardening scores by using the residual characteristics, and outputting detection results and early warning information according to the hardening scores. It can be seen that the method and system for detecting hardening of sprayed concrete have the following problems: The monitoring strategy can not be adjusted according to the interference adaptability of the extreme environment to the monitoring of the concrete state of the sensor, and the sensor is inaccurate or incomplete in detection due to errors or disadhesion of the sensor. Disclosure of Invention Therefore, the invention provides a real-time monitoring device for a concrete hardening process, which is used for solving the problem that the monitoring strategy cannot be adjusted according to the interference adaptability of an extreme environment to the monitoring of the state of the concrete by a sensor in the prior art. In order to achieve the above object, the present invention provides a real-time monitoring device for a concrete hardening process, comprising: the stage identification unit is connected with the monitoring unit and is used for acquiring the net temperature rise and the net strain of the concrete solid structure and extracting key characteristics of the net temperature rise curve and the net strain curve so as to identify the state stage of the concrete; The state judging unit is connected with the stage identifying