Method and system for intelligently monitoring and evaluating durability of marine concrete structure

Abstract

The invention relates to the technical field of concrete durability monitoring, in particular to an intelligent monitoring and evaluating method and system for durability of a marine concrete structure. The method comprises the following steps: S1, determining a durability weak position in a project design or construction stage, and pre-burying various sensors into corresponding positions in concrete; s2, after concrete pouring, setting and hardening and form removal, debugging an acquisition system, carrying out a series of self-inspection work, and starting to acquire data; s3, establishing an evaluation model, inputting data into the evaluation model, and refreshing the remaining service life, the reliability index beta and the failure probability in real time; and S4, the system recommends maintenance nodes, maintenance means and maintenance methods in real time according to the structural design service life for any selection of an engineering unit. The system comprises an electronic integration module and a full-automatic calculation module. According to the invention, key parameters in the concrete structure can be comprehensively monitored, and comprehensiveness and accuracy of durability monitoring and evaluation of the marine concrete structure are ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of concrete durability monitoring, and in particular to an intelligent monitoring and evaluation method and system for durability of marine concrete structures. Background Art

[0002] Durability improvement and maintenance technology research of concrete components are the basis for ensuring the long-term operation of concrete components. For marine concrete structures in use, accurate judgment of the durability status of concrete structures and components is crucial for the reasonable arrangement of long-term maintenance. Real-time evaluation of the durability status of concrete components requires updating and adjusting maintenance plans and inspection / monitoring strategies based on test and monitoring data, and performing local reinforcement treatment when necessary. During use, the durability status of concrete components is determined by routine testing and monitoring of technical indicators for the durability process. The actual durability status during service may differ from the results of the previous assessment, because the material parameters and environmental action parameters of the previous assessment may be different from the actual situation. Therefore, the original assessment results are updated according to the actual test data, or the collected test data is used for re-evaluation, so as to understand the durability status of concrete components in real time and provide basic data support for the maintenance management system to achieve rationalization and optimization.

[0003] A Chinese patent with publication number CN114154343A discloses a method for inversion analysis of durability parameters and life prediction of marine concrete structures. The method is based on a chloride ion diffusion transmission model expressed by an error function, obtains a linear regression inversion equation through integral transformation, analyzes the apparent surface chloride ion concentration and apparent chloride ion diffusion coefficient at any service time point, applies the attenuation law of the chloride ion diffusion coefficient and the change law of the apparent surface chloride ion concentration, and performs a second regression inversion analysis on the basis of the apparent chloride ion diffusion coefficient and the apparent surface chloride ion concentration obtained by the first inversion analysis, analyzing the attenuation coefficient of the apparent chloride ion diffusion coefficient and the change coefficient of the apparent surface chloride ion concentration. However, the above patent only makes reliable quantitative predictions based on the change of chloride ion concentration, but there are still many factors that affect the durability of concrete structures. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide an intelligent monitoring and evaluation method and system for the durability of marine concrete structures, which can comprehensively consider multiple factors to evaluate the durability of marine concrete structures.

[0005] The technical solution of the present invention is:

[0006] An intelligent monitoring and evaluation method for durability performance of marine concrete structures comprises the following steps:

[0007] S1. Determine the weak durability locations during the project design or construction phase and embed various sensors into the corresponding locations in the concrete;

[0008] S2: After the concrete is poured, solidified and hardened, and the formwork is removed, the data collection system is debugged, a series of self-checks are performed, and data collection begins;

[0009] S3. Establish an evaluation model, input data into the evaluation model, and update the remaining service life, reliability index β and failure probability in real time;

[0010] S4. The system recommends maintenance nodes, maintenance means and maintenance methods in real time according to the design service life of the structure for engineering units to choose at will.

[0011] Preferably, the evaluation model is:

[0012]

[0013] Among them, C cr and γ Ccr is the critical chloride ion concentration of steel bars and the corresponding partial coefficient; A Cs,Cl is the attenuation coefficient; w / b is the water-binder ratio of concrete; γ Cs,Cl is the partial coefficient of surface chloride ion concentration; erf is the error function; x and Δx are the thickness of concrete cover and construction deviation respectively; γ Rcl k is the chloride ion diffusion partial coefficient; e,Cl is the environmental impact coefficient of chloride ion diffusion; k c,Cl D is the maintenance coefficient of chloride ion diffusion; RCM,0 is the chloride ion diffusion coefficient; t' is the duration of the chloride ion diffusion coefficient determination test; n cl is the attenuation coefficient of chloride ion diffusion coefficient; t is the service time of the structure.

[0014] Preferably, the calculation formula of erf is:

[0015]

[0016] Preferably, the formula of the reliability index β is:

[0017]

[0018] P f It is the probability of an event occurring within the design service life, that is, the failure probability.

[0019] A marine concrete structure durability intelligent monitoring and evaluation system, the system comprising hardware and software, the hardware being an electronic integrated module for synchronously identifying and collecting various sensor signals, and the software being a fully automatic calculation module for rapidly calculating various high-order parameters for evaluation.

[0020] Preferably, the sensor includes an anode ladder, an Ag / AgCl electrode, an electromagnetic sensor, a temperature and humidity sensor and a steel stress gauge, which are used to monitor microenvironmental parameters, and the microenvironmental parameters include chloride ion concentration of different protective layer thicknesses, chloride ion diffusion coefficient, and degree of steel corrosion.

[0021] Preferably, the system is connected to a 5G wireless transmission module to upload the monitoring data to the network in real time and synchronize it to authorized mobile devices for obtaining real-time data remotely.

[0022] Preferably, the durability reinforcement measures recommended by the intelligent evaluation system include surface silane impregnation, surface polyurea waterproof coating, penetrating crystallization surface protection, cathodic protection, and bidirectional electromigration desalination.

[0023] Preferably, the system can be connected to an external 4K display screen, and various high-level parameters and maintenance plans can be displayed intuitively, which is convenient for reference by engineering-related personnel.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] By setting up a variety of sensors, the present invention can comprehensively monitor key parameters such as chloride ion concentration, chloride ion diffusion coefficient, degree of steel corrosion, etc. of different protective layer thicknesses in concrete structures, thereby ensuring the comprehensiveness and accuracy of durability monitoring and evaluation of marine concrete structures; the system can recommend maintenance nodes, maintenance means and maintenance methods in real time according to the designed service life of the structure, helping engineering units to make reasonable maintenance decisions and extend the service life of the structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 It is a flow chart of the method of the present invention.

[0028] Figure 2 It is a system composition diagram of the present invention. DETAILED DESCRIPTION

[0029] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0030] Example 1

[0031] like Figure 1 As shown, this embodiment provides a method for intelligent monitoring and evaluation of durability of marine concrete structures, including the following steps:

[0032] S1. Determine the weak durability locations during the project design or construction phase and embed various sensors into the corresponding locations in the concrete;

[0033] S2: After the concrete is poured, solidified and hardened, and the formwork is removed, the data collection system is debugged, a series of self-checks are performed, and data collection begins;

[0034] S3. Establish an evaluation model, input data into the evaluation model, and update the remaining service life, reliability index β and failure probability in real time;

[0035] S4. The system recommends maintenance nodes, maintenance means and maintenance methods in real time according to the design service life of the structure for the engineering unit to choose at will;

[0036] S5. The system reflects the following specific information in the evaluation results: when is the repair expected to be needed, where is the repair expected to be done, what means are expected to be used (epoxy coating or electrochemical dechlorination), estimated costs, etc.

[0037] Preferably, the evaluation model is:

[0038]

[0039] Among them, C cr and γ Ccr is the critical chloride ion concentration of steel bars and the corresponding partial coefficient; A Cs,Cl is the attenuation coefficient; w / b is the water-binder ratio of concrete; γ Cs,Cl is the partial coefficient of surface chloride ion concentration; erf is the error function; x and Δx are the thickness of concrete cover and construction deviation respectively; γ Rcl k is the chloride ion diffusion partial coefficient; e,Cl is the environmental impact coefficient of chloride ion diffusion; k c,Cl D is the maintenance coefficient of chloride ion diffusion; RCM,0 is the chloride ion diffusion coefficient; t' is the duration of the chloride ion diffusion coefficient determination test; ncl is the attenuation coefficient of chloride ion diffusion coefficient; t is the service time of the structure.

[0040] Preferably, the calculation formula of erf is:

[0041]

[0042] Preferably, the formula of the reliability index β is:

[0043]

[0044] P f It is the probability of an event occurring within the design service life, that is, the failure probability.

[0045] Example 2

[0046] like Figure 2 As shown, an intelligent monitoring and evaluation system for the durability of marine concrete structures is provided. The system includes hardware and software. The hardware is an electronic integrated module for synchronously identifying and collecting various sensor signals. The software is a fully automatic calculation module for rapidly calculating various high-order parameters for evaluation.

[0047] Preferably, the sensor includes an anode ladder, an Ag / AgCl electrode, an electromagnetic sensor, a temperature and humidity sensor and a steel stress gauge, which are used to monitor microenvironmental parameters, and the microenvironmental parameters include chloride ion concentration of different protective layer thicknesses, chloride ion diffusion coefficient, and degree of steel corrosion.

[0048] Preferably, the system is connected to a 5G wireless transmission module to upload the monitoring data to the network in real time and synchronize it to authorized mobile devices for obtaining real-time data remotely.

[0049] Preferably, the durability reinforcement measures recommended by the intelligent evaluation system include surface silane impregnation, surface polyurea waterproof coating, penetrating crystallization surface protection, cathodic protection, and bidirectional electromigration desalination.

[0050] Preferably, the system can be connected to an external 4K display screen, and various high-level parameters and maintenance plans can be displayed intuitively, which is convenient for reference by engineering-related personnel.

[0051] Working principle: First, determine the durability weak position (tidal zone and splash zone in direct contact with seawater and air) during the project design or construction phase, and pre-embed various sensors, including: steel bar stress gauges responsible for monitoring the stress level in the concrete structure; temperature and humidity sensors responsible for monitoring the internal temperature and relative humidity; electromagnetic sensors responsible for monitoring the corrosion of steel bars; anode ladders responsible for monitoring the penetration of chloride ions along the protective layer. After the concrete is poured, solidified and hardened, and the formwork is removed, the collection system is debugged, a series of self-inspections are carried out, and data collection begins. At the same time, the evaluation system starts working. The system is connected to a 5G wireless transmission system to transmit the monitoring and calculation results to the monitoring screen of the engineering command center and the mobile devices of authorized personnel (smartphones, tablets) in real time. Due to the limited penetration depth of chloride ions and sulfate ions in the early stage of marine exposure, the system refresh frequency can be appropriately relaxed. As the service time increases, the system refresh frequency can be gradually increased. When the remaining service life, reliability index or failure probability reaches the preset threshold, the system automatically alarms. The system recommends maintenance nodes, maintenance means and maintenance methods in real time according to the design service life of the structure (component) (with maintenance costs accurate to RMB / m 2 ) for engineering units to choose from, including surface silane impregnation, surface polyurea waterproof coating, permeable crystallization surface protection, cathodic protection (sacrificial anode or impressed current), bidirectional electromigration desalination, etc. The system refresh time can be set freely, generally referring to the component exposure environment and other relevant indicators.

[0052] Although the present invention has been described in detail by referring to the accompanying drawings and in combination with the preferred embodiments, the present invention is not limited thereto. Without departing from the spirit and essence of the present invention, a person of ordinary skill in the art may make various equivalent modifications or substitutions to the embodiments of the present invention, and these modifications or substitutions shall be within the scope of the present invention. Any person of ordinary skill in the art may easily think of changes or substitutions within the technical scope disclosed by the present invention, and these shall be within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. An intelligent monitoring and evaluation method for durability performance of marine concrete structures, characterized in that: The steps include: S1. Determine the weak durability locations during the project design or construction phase and embed various sensors into the corresponding locations in the concrete; S2: After the concrete is poured, solidified and removed from the formwork, the data collection system is debugged, a series of self-checks are performed, and data collection begins; S3. Establish an evaluation model, input data into the evaluation model, and update the remaining service life, reliability index β and failure probability in real time; S4. The system recommends maintenance nodes, maintenance means and maintenance methods in real time according to the design service life of the structure for engineering units to choose at will.

2. The method for intelligent monitoring and evaluation of durability of marine concrete structures according to claim 1, characterized in that: The evaluation model is: Among them, C cr and γ Ccr is the critical chloride ion concentration of steel bars and the corresponding partial coefficient; A Cs,Cl is the attenuation coefficient; w / b is the water-binder ratio of concrete; γ Cs,Cl is the partial coefficient of surface chloride ion concentration; erf is the error function; x and Δx are the thickness of concrete cover and construction deviation respectively; γ Rcl k is the chloride ion diffusion partial coefficient; e,Cl is the environmental impact coefficient of chloride ion diffusion; k c,Cl D is the maintenance coefficient of chloride ion diffusion; RCM,0 is the chloride ion diffusion coefficient; t' is the duration of the chloride ion diffusion coefficient determination test; n cl is the attenuation coefficient of chloride ion diffusion coefficient; t is the service time of the structure.

3. The method for intelligent monitoring and evaluation of durability of marine concrete structures according to claim 2, characterized in that: The calculation formula of erf is:

4. The method for intelligent monitoring and evaluation of durability of marine concrete structures according to claim 1, characterized in that: The formula of the reliability index β is: P f is the probability of an event occurring within the design service life.

5. An intelligent monitoring and evaluation system for durability of marine concrete structures, using the intelligent monitoring and evaluation method for durability of marine concrete structures as claimed in any one of claims 1 to 4, characterized in that: The system includes hardware and software. The hardware is an electronic integrated module for synchronously identifying and collecting various sensor signals, and the software is a fully automatic calculation module for quickly calculating various high-order parameters for evaluation.

6. The intelligent monitoring and evaluation system for durability of marine concrete structures according to claim 5, characterized in that: The sensor includes an anode ladder, an Ag / AgCl electrode, an electromagnetic sensor, a temperature and humidity sensor, and a steel bar stress gauge, which are used to monitor microenvironmental parameters, including chloride ion concentrations of different protective layer thicknesses, chloride ion diffusion coefficients, and steel bar corrosion degrees.

7. The intelligent monitoring and evaluation system for durability of marine concrete structures according to claim 5, characterized in that: The system is connected to a 5G wireless transmission module to upload monitoring data to the network in real time and synchronize it to authorized mobile devices for obtaining real-time data remotely.

8. The intelligent monitoring and evaluation system for durability of marine concrete structures according to claim 5, characterized in that: The recommended durability reinforcement measures of the intelligent evaluation system include surface silane impregnation, surface polyurea waterproof coating, penetrating crystallization surface protection, cathodic protection, and bidirectional electromigration desalination.

9. The intelligent monitoring and evaluation system for durability of marine concrete structures according to claim 5, characterized in that: The system is connected to an external 4K display screen, and various high-level parameters and maintenance plans are intuitively displayed for reference by engineering personnel.

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