Section temperature monitoring system for concrete girder in long-span bridge

Abstract

The invention discloses a section temperature monitoring system for a concrete girder in a long-span bridge, and is applied to the technical field of construction safety. Comprising a temperature monitoring module, a modeling simulation module, a data analysis module and a safety early warning module. The temperature monitoring module is arranged at a monitoring point of a bridge, collects the temperature at the monitoring point in real time and sends the temperature to the modeling simulation module; the modeling simulation module establishes a three-dimensional finite element model of the bridge based on design parameters of the bridge and data acquired by the temperature monitoring module; the data analysis module analyzes the three-dimensional finite element model of the bridge, analyzes the influence of temperature on bridge safety parameters and corrects the bridge safety parameters; and the safety early warning module performs construction safety early warning based on the bridge safety parameters corrected by the data analysis module. The influence of the temperature is analyzed by monitoring the section temperature of the bridge, early warning is performed on construction safety, and the safety of the construction process is improved.

Description

Technical Field

[0001] The invention relates to the technical field of construction safety, and more particularly to a cross-sectional temperature monitoring system for a concrete main beam in a long-span bridge. Background Art

[0002] The construction monitoring of bridges refers to the work of simulating and analyzing the construction process through finite element software, monitoring the structural stress, cable force, geometric state, temperature, etc. on site, as well as error identification and prediction, and feedback control of the mechanical behavior of the bridge structure during the construction process, in order to provide technical support for achieving a reasonable bridge state. Construction monitoring takes the design of the bridge state as the goal, and runs through the bridge from design to construction to operation and even the entire life cycle, so as to ensure the safety of the structure during the construction process and the rationality of the bridge state. Temperature monitoring is a very important item in construction monitoring. During the construction process, temperature changes will cause changes in bridge structural parameters, resulting in construction errors. It is often necessary to perform certain construction steps within a period of time when the temperature is stable and the change range is not large. Most of the existing bridge temperature monitoring schemes collect temperature data of the bridge during actual use and analyze the safety performance of the bridge. During the construction stage, since temperature has an impact on various design structural parameters during the bridge construction process, although the existing monitoring technology can obtain the real-time temperature of the bridge measurement point, it still needs to be under a relatively stable temperature to judge the safety of the structural parameters and construction errors during the construction process. Therefore, how to provide a cross-sectional temperature monitoring system for concrete main beams in long-span bridges is a problem that technical personnel in this field urgently need to solve. Summary of the invention

[0003] In view of this, the present invention provides a cross-sectional temperature monitoring system for concrete main beams in large-span bridges, which monitors the temperature of the bridge cross section in real time during the construction process and performs analysis, and further analyzes the safety performance and construction errors of the construction process.

[0004] In order to achieve the above object, the present invention provides the following technical solutions:

[0005] A cross-sectional temperature monitoring system for a concrete main beam in a long-span bridge, comprising a temperature monitoring module, a modeling simulation module, a data analysis module and a safety warning module;

[0006] The temperature monitoring module is set at the monitoring point of the bridge, collects the temperature at the monitoring point in real time and sends it to the modeling and simulation module;

[0007] Modeling and simulation module, which builds a three-dimensional finite element model of the bridge based on the design parameters of the bridge and the data collected by the temperature monitoring module;

[0008] Data analysis module, which analyzes the three-dimensional finite element model of the bridge, obtains the impact of temperature on the bridge safety parameters and corrects the bridge safety parameters;

[0009] The safety warning module provides construction safety warning based on the bridge safety parameters corrected by the data analysis module.

[0010] Optionally, the temperature monitoring module includes a sensor, a data transmission terminal and a database. The sensor is a stress sensor that integrates temperature and stress testing. The data transmission terminal sends the temperature and stress data collected by the sensor to the database. The database stores the temperature and stress data and uses them for subsequent data processing and analysis.

[0011] Optionally, the main beam monitoring section of the sensor is located at 1 / 4, 1 / 2, and 3 / 4 of the main beam length, the pier monitoring section is located at the bottom and top of the pier, and the temperature monitoring points are set at the upper and lower edge positions of the monitoring section.

[0012] Optionally, the monitoring frequency of the sensor is once per minute, and the correction frequency of the bridge safety parameters is twice for each construction segment, which is performed during the pre-installation and stress adjustment stages of each segment respectively.

[0013] Optionally, the modeling and simulation module includes a finite element modeling unit, a data updating unit and a temperature field calculation unit. The finite element modeling unit establishes a three-dimensional finite element model of the bridge based on the design parameters of the bridge, and the three-dimensional finite element model includes multiple nodes and units. The data updating unit updates the data in the three-dimensional finite element model to bridge safety parameters obtained by real-time measurement. The temperature field calculation unit establishes the spatial distribution of the temperature field of the bridge based on the temperature data at the monitoring point and calculates the bridge safety parameter data at different temperatures.

[0014] Optionally, the data analysis module analyzes the temperature data and bridge safety parameters to obtain the relationship between the temperature data and the bridge safety parameters, fits the bridge safety parameters and temperature data by the least squares method to obtain the influence of temperature on the bridge safety parameters, and then separates the influence of temperature to correct the bridge safety parameters.

[0015] Optionally, the safety warning module compares the corrected bridge safety parameter U0 with the warning value U n Compare and judge the safety level. When 100% U n >U0≥80%U n , the safety level is level three, continue construction, maintain normal monitoring and alarm, when 110% U n >U0≥100%U n , the safety level is level 2, continue construction, strengthen monitoring and issue alarms, when U0 ≥ 110% U n, the safety level is level one, stop construction, strengthen monitoring, issue emergency alarms, and take protective measures.

[0016] It can be seen from the above technical solution that, compared with the prior art, the present invention provides a cross-sectional temperature monitoring system for concrete main beams in large-span bridges, which has the following beneficial effects: the present invention establishes a three-dimensional finite element model of the bridge on the basis of real-time monitoring of bridge temperature data during construction, analyzes the influence of temperature on bridge safety parameters and corrects the bridge safety parameters, and performs safety warnings on this basis. In addition to realizing the function of continuous temperature monitoring to obtain temperature changes, it can also reduce the influence of temperature changes on bridge construction safety and error judgment, thereby improving the safety performance of the construction process. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] 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, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0018] Figure 1 It is a schematic diagram of the cross-section temperature monitoring system of the present invention;

[0019] Figure 2 Schematic diagram of the working principle of the safety warning module in an embodiment of the present invention. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions 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 are within the scope of protection of the present invention.

[0021] The embodiment of the present invention discloses a cross-sectional temperature monitoring system for a concrete main beam in a long-span bridge, such as Figure 1 As shown, it includes temperature monitoring module, modeling simulation module, data analysis module and safety warning module;

[0022] The temperature monitoring module is set at the monitoring point of the bridge, collects the temperature at the monitoring point in real time and sends it to the modeling and simulation module;

[0023] Modeling and simulation module, which builds a three-dimensional finite element model of the bridge based on the design parameters of the bridge and the data collected by the temperature monitoring module;

[0024] Data analysis module, which analyzes the three-dimensional finite element model of the bridge, obtains the impact of temperature on the bridge safety parameters and corrects the bridge safety parameters;

[0025] The safety warning module provides construction safety warning based on the bridge safety parameters corrected by the data analysis module.

[0026] Furthermore, the temperature monitoring module includes a sensor, a data transmission terminal and a database. The sensor is a stress sensor that integrates temperature and stress testing. The data transmission terminal sends the temperature and stress data collected by the sensor to the database. The database stores the temperature and stress data and uses them for subsequent data processing and analysis.

[0027] Furthermore, in an embodiment of the present invention, the sensor adopts a fiber grating stress strain sensor.

[0028] Furthermore, the main beam monitoring sections of the sensor are located at 1 / 4, 1 / 2, and 3 / 4 of the main beam length, the pier monitoring sections are located at the bottom and top of the pier, and the temperature monitoring points are set at the upper and lower edge positions of the monitoring sections.

[0029] Furthermore, the monitoring frequency of the sensors is once per minute, and the correction frequency of the bridge safety parameters is twice per construction segment, which is performed during the pre-installation and stress adjustment stages of each segment, respectively.

[0030] Furthermore, the modeling and simulation module includes a finite element modeling unit, a data updating unit and a temperature field calculation unit. The finite element modeling unit establishes a three-dimensional finite element model of the bridge based on the design parameters of the bridge, and the three-dimensional finite element model includes multiple nodes and units. The data updating unit updates the data in the three-dimensional finite element model to the bridge safety parameters obtained by real-time measurement. The temperature field calculation unit establishes the spatial distribution of the temperature field of the bridge based on the temperature data at the monitoring point and calculates the bridge safety parameter data at different temperatures.

[0031] Furthermore, the data analysis module analyzes the temperature data and bridge safety parameters to obtain the relationship between the temperature data and the bridge safety parameters, fits the bridge safety parameters and temperature data through the least squares method to obtain the influence of temperature on the bridge safety parameters, and then separates the influence of temperature to correct the bridge safety parameters.

[0032] Furthermore, in the embodiment of the present invention, the strain of the bridge is affected by the shrinkage of the concrete itself, temperature change and force change, and the strain caused by the temperature change is linearly related to the temperature:

[0033] ε=aT+b

[0034] In the formula, ε is the strain caused by temperature change, T is temperature, a and b are calculation coefficients. The data analysis module obtains the values ​​of calculation coefficients a and b by analyzing a large amount of collected temperature change and strain data:

[0035]

[0036] In the formula, are the mean values ​​of temperature and strain in all data respectively, n is the total number of data, i∈[1,n]. After obtaining the relationship between temperature data and bridge safety parameters, the strain caused by temperature is separated and the strain of the bridge is recalculated to complete the correction.

[0037] Further, such as Figure 2 As shown in the figure, the safety warning module compares the corrected bridge safety parameter U0 with the warning value U n Compare and judge the safety level. When 100% U n >U0≥80%U n , the safety level is level three, continue construction, maintain normal monitoring and alarm, when 110% U n >U0≥100%U n , the safety level is level 2, continue construction, strengthen monitoring and issue alarms, when U0 ≥ 110% U n , the safety level is level one, stop construction, strengthen monitoring, issue emergency alarms, and take protective measures.

[0038] Furthermore, in an embodiment of the present invention, the safety level is level two, and a comprehensive manual judgment is made on the safety situation in combination with the construction situation. If the judgment result is safe, construction continues. If it is unsafe, protective measures need to be taken and the safety level needs to be re-judged.

[0039] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same and similar parts between the embodiments can be referred to each other. The above description of the disclosed embodiments enables professionals and technicians in this field to implement or use the present invention. Various modifications to these embodiments will be obvious to professionals and technicians in this field, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown in this article, but will comply with the widest range consistent with the principles and novel features disclosed herein.

Claims

1. A cross-sectional temperature monitoring system for concrete main beams in long-span bridges, characterized in that: Including temperature monitoring module, modeling and simulation module, data analysis module and safety warning module; The temperature monitoring module is set at the monitoring point of the bridge, collects the temperature at the monitoring point in real time and sends it to the modeling and simulation module; Modeling and simulation module, which builds a three-dimensional finite element model of the bridge based on the design parameters of the bridge and the data collected by the temperature monitoring module; Data analysis module, which analyzes the three-dimensional finite element model of the bridge, obtains the impact of temperature on the bridge safety parameters and corrects the bridge safety parameters; The safety warning module provides construction safety warning based on the bridge safety parameters corrected by the data analysis module.

2. A cross-sectional temperature monitoring system for a concrete main beam in a long-span bridge according to claim 1, characterized in that: The temperature monitoring module includes a sensor, a data transmission terminal and a database. The sensor is a stress sensor that integrates temperature and stress testing. The data transmission terminal sends the temperature and stress data collected by the sensor to the database. The database stores the temperature and stress data and uses them for subsequent data processing and analysis.

3. A cross-sectional temperature monitoring system for a concrete main beam in a long-span bridge according to claim 2, characterized in that: The main beam monitoring sections of the sensor are located at 1 / 4, 1 / 2, and 3 / 4 of the main beam length; the pier monitoring sections are located at the bottom and top of the pier column; and the temperature monitoring points are set at the upper and lower edges of the monitoring sections.

4. A cross-sectional temperature monitoring system for a concrete main beam in a long-span bridge according to claim 2, characterized in that: The monitoring frequency of the sensors is once per minute, and the correction frequency of the bridge safety parameters is twice per construction stage, which is performed during the pre-installation and stress adjustment stages of each segment respectively.

5. The cross-sectional temperature monitoring system for concrete main beams in long-span bridges according to claim 1, characterized in that: The modeling and simulation module includes a finite element modeling unit, a data updating unit and a temperature field calculation unit. The finite element modeling unit establishes a three-dimensional finite element model of the bridge based on the design parameters of the bridge. The three-dimensional finite element model includes multiple nodes and units. The data updating unit updates the data in the three-dimensional finite element model to the bridge safety parameters obtained by real-time measurement. The temperature field calculation unit establishes the spatial distribution of the temperature field of the bridge based on the temperature data at the monitoring point and calculates the bridge safety parameter data at different temperatures.

6. A cross-sectional temperature monitoring system for a concrete main beam in a long-span bridge according to claim 5, characterized in that: The data analysis module analyzes the temperature data and bridge safety parameters to obtain the relationship between the temperature data and the bridge safety parameters. The bridge safety parameters and temperature data are fitted by the least squares method to obtain the influence of temperature on the bridge safety parameters. The bridge safety parameters are then corrected by separating the influence of temperature.

7. A cross-sectional temperature monitoring system for a concrete main beam in a long-span bridge according to claim 1, characterized in that: The safety warning module compares the corrected bridge safety parameter U0 with the warning value U n Compare and judge the safety level. When 100% U n >U0≥80%U n , the safety level is level three, continue construction, maintain normal monitoring and alarm, when 110% U n >U0≥100%U n , the safety level is level 2, continue construction, strengthen monitoring and issue alarms, when U0 ≥ 110% U n , the safety level is level one, stop construction, strengthen monitoring, issue emergency alarms, and take protective measures.

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