CN-121977648-A - Intelligent monitoring and alarming device for end part of double-layer continuous reinforced concrete pavement

CN121977648ACN 121977648 ACN121977648 ACN 121977648ACN-121977648-A

Abstract

The invention relates to an intelligent monitoring and alarming device for an end part of a double-layer continuous reinforced concrete pavement, which comprises a stress monitoring module, an end part crack monitoring module, an end part displacement-warping monitoring module and an embedded edge calculating and alarming module, wherein the stress monitoring module is used for synchronously monitoring stress data of an upper layer steel bar and a lower layer steel bar of the double-layer continuous reinforced concrete pavement, the end part crack monitoring module is used for monitoring crack width and expansion trend of the end part of the pavement in real time, the end part displacement-warping monitoring module is used for monitoring relative vertical displacement and warping deformation of the end part, and the embedded edge calculating and alarming module is used for processing multidimensional data, deducing risks and alarming in a grading manner. By integrating multidimensional data acquisition, intelligent analysis and real-time early warning functions, dynamic perception and accurate evaluation of key mechanical behaviors such as end reinforcing steel bar stress, interface displacement, environmental coupling effect and the like are realized, and pavement maintenance is promoted to be changed from 'passive repair' to 'predictive protection'.

Inventors

HU CHANGBIN
DENG DONGSHENG
JIA LINGYAN
WANG GUANGMING
KANG XIAOGANG

Assignees

福州大学

Dates

Publication Date: 20260505
Application Date: 20260205

Claims (10)

1. The intelligent monitoring and alarming device for the end part of the double-layer continuous reinforced concrete pavement is characterized by comprising a stress monitoring module, an end part crack monitoring module, an end part displacement-warping monitoring module, an embedded edge calculating and alarming module and a power supply and communication module, wherein the stress monitoring module is used for synchronously monitoring stress data of an upper layer steel bar and a lower layer steel bar of the double-layer continuous reinforced concrete pavement, the end part crack monitoring module is used for monitoring crack width and expansion trend of the end part of the pavement in real time, the end part displacement-warping monitoring module is used for monitoring relative vertical displacement and warping deformation of the end part, the embedded edge calculating and alarming module is used for processing multidimensional data, deducing risks and alarming in a grading mode, and the power supply and communication module is used for providing electric energy and remote data transmission.
2. The intelligent monitoring and alarming device for the end part of the double-layer continuous reinforced concrete pavement according to claim 1, wherein the embedded edge computing and alarming module integrates an MCU, a data storage chip, an alarming unit and a lightweight model algorithm, and the embedded edge computing and alarming module computes a risk index and realizes graded alarming.
3. The intelligent monitoring and alarming device for the end part of the double-layer continuous reinforced concrete pavement according to claim 2, wherein the workflow of the embedded edge calculating and alarming module comprises the following steps: Step S1, multi-source data synchronous aggregation and standardization processing, wherein an MCU establishes data transmission connection with a stress monitoring module, an end crack monitoring module and an end displacement-warping monitoring module through a standardization interface, and synchronously acquires steel bar stress, crack width and expansion speed, end displacement and warping angle data; s2, edge calculation and disease identification; step S21, extracting the characteristics, namely extracting physical characteristic vectors with low dimension and high interpretation from a standardized data stream according to structural mechanics and a signal processing principle; s22, constructing a heterogeneous characteristic evidence body based on a pavement structure response mechanism, and realizing cross verification and complementation judgment among monitoring results of different physical quantities, thereby improving the confidence coefficient and the robustness of diagnosis; Step S23, a risk quantification identification layer receives the checked high-confidence characteristic set from the fusion reasoning layer and converts the high-confidence characteristic set into a quantitative comprehensive risk index; Step S3, hierarchical alarming and data pushing are carried out, wherein the hierarchical alarming and data pushing is cooperated with a power supply and communication module, real-time, digital and visual access of monitoring data and alarming information to a road maintenance management platform is realized by means of communication transmission capacity of the power supply and communication module, and two-stage alarming threshold RI is preset according to actual service conditions of different road sections; and S4, carrying out collaborative and algorithm iterative optimization on Bian Yun, namely constructing a framework integrating edge calculation and a cloud platform, wherein the edge side is responsible for real-time data processing and rapid early warning, and the cloud platform bears a complex model training task.
4. The intelligent monitoring and alarming device for the end of the double-layer continuous reinforced concrete pavement according to claim 3, wherein the material characteristic vector extracted in the step S21 comprises a stress distribution imbalance factor S t , a crack propagation dynamic index C t and an end deformation trend displacement D t ; stress distribution unbalance factor S t for synchronously collecting stress of upper layer steel bar at t moment And the stress of the lower layer steel bar First, calculate the difference In order to eliminate the influence of instantaneous load fluctuation, a sliding time window with length of N is taken and the inside of the window is calculated The standard deviation of the sequence is defined as the stress distribution imbalance factor at that time : Wherein, the The average value of the stress difference value in the window; is characterized by abnormal force distribution or local rigidity loss in the structure; Crack propagation dynamic index C t based on the calculated crack width time sequence data W t of the optical fiber sensor, calculating the first-order difference Thereby calculating the second order difference Fracture propagation dynamic index Defined as the exponentially smoothed value of acceleration: Wherein lambda is the smoothing coefficient [ ] ); And continue to grow, indicating crack propagation into an unstable acceleration phase; end deformation trend displacement D t sequence acquired by end displacement-warping monitoring module Using cut-off frequency as Filtering by a zero-phase digital low-pass filter to obtain a trend dip angle signal Then, converting the displacement into a trend vertical displacement of the end part relative to the stable datum point through a geometric relation : Wherein, the For the horizontal distance from the installation position of the end displacement-warping monitoring module to the theoretical rotation pivot point, the pair of The sequences were linearly fitted with their slopes I.e., a long-term average rate that characterizes the tip rise or fall.
5. The intelligent monitoring and alarming device for the end of the double-layer continuous reinforced concrete pavement according to claim 4, wherein the step S22 is provided with an evidence consistency check matrix, and the logic rules are as follows: Rule R 1 automatically triggers verification of contemporaneous stress data if C t > threshold η c , if S t > threshold η s is simultaneously satisfied and Or (b) Judging that the non-load periodic sudden change occurs, namely judging that the structural crack is high in confidence, otherwise, marking the structural crack as surface crack to be observed; Rule R 2 , if the change quantity delta D of D t in a short time window exceeds a threshold value eta ΔD , synchronously checking crack characteristics C t and stress characteristics S t in the time period, and if neither C t nor S t has obvious change, then early warning of 'foundation local hollowing or support failure', and if C t is obviously increased at the same time, early warning of 'rapid dislocation caused by structural damage'; And the rule R 3 is that when a certain characteristic quantity is in intense jump and all other related characteristic quantities are kept stable in the same time sequence window, the system automatically distributes a low confidence weight for the abnormal characteristic and possibly triggers a sensor self-diagnosis process, so that false alarm caused by single-point fault is effectively restrained.
6. The intelligent monitoring and warning apparatus for end of double-deck continuous reinforced concrete pavement according to claim 5, wherein the comprehensive risk index in step S23 The calculation formula of (2) is as follows: Wherein: mapping each characteristic quantity to a [0,1] interval for a normalization function; for the dynamic weight corresponding to each feature, satisfy 。
7. The intelligent monitoring and alarming device for the end part of the double-layer continuous reinforced concrete pavement according to claim 3, wherein in the step S3, the device comprises a lowest critical threshold T 1 and a highest critical threshold T 2 , and the early warning mechanism is as follows: Triggering a first-level early warning T 1 < RI<T 2 , and silently pushing a road section number, a monitoring point position, an original data packet and an RI value to a road surface management center for background depth analysis; and the II-level emergency alarm RI > T 2 triggers a second-level emergency alarm and immediately pushes early warning information containing the type of end diseases, the risk level and the specific position.
8. The intelligent monitoring and alarming device for the end of the double-layer continuous reinforced concrete pavement according to claim 1, wherein the stress monitoring module is a vibrating wire type concrete stress meter which is distributed on an upper layer steel bar and a lower layer steel bar of the double-layer continuous reinforced concrete pavement, and the stress difference between the upper layer steel bar and the lower layer steel bar is calculated to judge abnormal movement of a stressed neutral axis.
9. The intelligent monitoring and alarming device for the end part of the double-layer continuous reinforced concrete pavement according to claim 1, wherein the end part crack monitoring module is characterized in that an optical fiber grating sensor array is used, the optical fiber grating sensor array is transversely distributed along the end part of the pavement, and the optical fiber grating sensor array is vertically distributed in a Z shape or an S shape to cover the vertical height of the concrete.
10. The intelligent monitoring and alarming device for the end part of the double-layer continuous reinforced concrete pavement is characterized in that the end part displacement-warping monitoring module adopts a MEMS sensor, the MEMS sensor is arranged at the position of 5cm of the outermost edge of the end of a pavement slab, is perpendicular to the pavement and is close to the edge of a pavement base, and the MEMS sensor is a MEMS accelerometer or a MEMS inclinometer.

Description

Intelligent monitoring and alarming device for end part of double-layer continuous reinforced concrete pavement Technical Field The invention belongs to the technical field of road engineering structure monitoring, and particularly relates to an intelligent monitoring and alarming device for an end part of a double-layer continuous reinforced concrete pavement. Background The double-layer continuous reinforced concrete pavement is a high-performance pavement structure with an upper layer of continuous reinforced mesh and a lower layer of continuous reinforced mesh arranged in a full thickness range, and is widely applied to projects with high requirements on bearing capacity and durability, such as high-grade highways, airport runways and the like. The structure is characterized in that the reinforcement mesh is continuously distributed along the longitudinal direction, joints are not arranged, and an integral stress system is formed, so that the integrity and the crack resistance of the pavement are obviously improved. The double-layer continuous reinforcement can effectively restrict the tensile stress of the concrete caused by temperature shrinkage and dry shrinkage, avoid generating harmful wide cracks, and only form fine and controllable-width microcracks. In addition, the structure eliminates the traditional transverse joint, improves the travelling smoothness, improves the structural durability and prolongs the service life of the pavement. However, with the increase of traffic volume and the increase of overload and heavy-duty vehicles, the double-layer continuous reinforced concrete pavement structure, particularly the end region thereof, faces an increasingly serious test. The ends act as key points for stress concentration and anchoring, and bear accumulated deformation of the pavement slab caused by temperature change. Under the combined action of external load and internal constraint, the end part of the double-layer continuous reinforced concrete pavement is easy to generate diseases such as reinforcing steel bar stress concentration, abnormal expansion of cracks, extrusion displacement, dislocation and the like, and the structural safety is seriously influenced. At present, the structural health monitoring of a double-layer continuous reinforced concrete pavement still has obvious technical shortboards, on one hand, the existing monitoring multi-focus pavement main body area is almost blank aiming at a special monitoring device of a stress concentration core part at an end part, conventional equipment cannot adapt to a complex structure of rigid connection of the end part 'plate body-ground beam', and is difficult to capture the evolution process of special diseases such as tensile stress accumulation, extrusion displacement and the like, on the other hand, the whole monitoring mode is highly dependent on manual inspection, so that the efficiency is low, the labor cost is high, and the real-time acquisition and dynamic analysis of key mechanical parameters cannot be realized, which causes the dilemma that the potential diseases at the end part are difficult to identify in the sprouting stage, the maintenance work falls into passive repair after the disease is developed, and the efficiency and the economical efficiency of the whole life cycle management of the double-layer CRCP pavement are seriously restricted. Therefore, there is a need to develop an intelligent monitoring device which is specially adapted to the end structure of a double-layer continuous reinforced concrete pavement and can stably run for a long time. Disclosure of Invention The invention aims at improving the problems existing in the prior art, namely the technical problem to be solved by the invention is to provide an intelligent monitoring and alarming device for the end part of a double-layer continuous reinforced concrete pavement. The technical scheme includes that the intelligent monitoring and alarming device for the end part of the double-layer continuous reinforced concrete pavement comprises a stress monitoring module, an end part crack monitoring module, an end part displacement-warping monitoring module, an embedded edge calculating and alarming module and a power supply and communication module, wherein the stress monitoring module is used for synchronously monitoring stress data of upper-layer steel bars and lower-layer steel bars of the double-layer continuous reinforced concrete pavement, the end part crack monitoring module is used for monitoring crack width and expansion trend of the end part of the pavement in real time, the end part displacement-warping monitoring module is used for monitoring relative vertical displacement and warping deformation of the end part, the embedded edge calculating and alarming module is used for processing, deducing risks and alarming in a grading mode on multidimensional data, and the power supply and communication module is used for providing electric energy and remote da