CN114662358A - General type bridge foundation local scouring depth evaluation system - Google Patents

Abstract

The invention discloses a general system for evaluating local scouring depth of a bridge foundation, which comprises: the data acquisition system is used for acquiring the water depth, the water level and the flow velocity of a monitoring point; the data processing system comprises a data storage module and a data analysis module; the data storage module is connected with the data acquisition system and used for storing monitoring point data acquired by the data acquisition system and bridge foundation early-stage scouring data; the data analysis module acquires data from the data storage module, calculates the scouring depth values of the monitoring points, and obtains numerical simulation predicted scouring depth values and fitting predicted scouring depth values; the early warning issuing system comprises a data evaluation module and an early warning information pushing module, wherein the data evaluation module is used for evaluating the early warning level of the basic health of the bridge; and the early warning information pushing module is used for releasing early warning information according to the early warning level. The method can accurately evaluate the health condition of the bridge foundation and protect the safety of the bridge foundation.

Description

A general-purpose bridge foundation local scour depth assessment system

technical field

The invention relates to the field of bridge foundation scouring depth monitoring devices. More specifically, the present invention relates to a general-purpose bridge foundation local scour depth assessment system.

Background technique

Local scouring of bridges is the cause of most bridge water damage, and it is difficult to repair after the occurrence. Therefore, it is of great significance to evaluate and prevent the occurrence of bridge water damage. At this stage, by monitoring the local scour changes of bridges, establishing a prediction model to predict and warn the bridge foundation health and safety, and form a bridge foundation local scour assessment system, it is the development trend of bridge foundation health and safety assessment. In the prior art, there are sonar technology and multi-beam methods for local scour monitoring technologies on the periphery of bridge foundations, and the monitoring methods are divided into fixed instrument monitoring and portable instrument monitoring. However, at present, these methods obtain long time interval or irregular monitoring, which not only requires human underwater auxiliary measurement, but also the prediction results are not accurate enough.

SUMMARY OF THE INVENTION

An object of the present invention is to solve at least the above-mentioned problems and to provide at least the advantages which will be explained later.

In order to achieve these objects and other advantages according to the present invention, a general-purpose bridge foundation local scour depth assessment system is provided, comprising:

A data acquisition system, which is used to collect the water depth, water level and flow velocity of the monitoring point;

a data processing system, which includes a data storage module and a data analysis module; the data storage module is connected to the data acquisition system to store the monitoring point data collected by the data acquisition system and the early scour data of the bridge foundation; the data The analysis module obtains data from the data storage module, calculates the scour depth value of the monitoring point, and obtains the numerical simulation predicted scour depth value and the fitting predicted scour depth value through numerical simulation calculation and genetic algorithm fitting calculation respectively;

An early warning release system, which includes a data evaluation module and an early warning information push module, the data evaluation module obtains the monitoring point scour depth value, the numerical simulation predicted scour depth value and the fitting predicted scour depth value from the data analysis module, and takes one of the The maximum value is used to evaluate the basic health early warning level of the bridge; the early warning information push module issues early warning information according to the early warning level.

Preferably, the data acquisition system includes a data acquisition device and a data transmission device; the data acquisition device is arranged on both sides of the bridge pier, the data transmission device includes a network regulator, and the network regulator receives the data acquisition device The collected data is transmitted to the data storage module.

Preferably, the data acquisition device includes a osmometer, a water level meter and a flow meter, and the osmometer, the water level meter and the flow meter are all lowered into the water through a retractable wire rope, wherein the seepage meter is lowered into the water. An inclinometer is arranged on the wire rope of the pressure gauge, and a counterweight is connected to the bottom of the pressure gauge.

Preferably, the scour depth value h _j of the monitoring point is calculated as follows:

h _j =h _s -h _c -h'

where h _s is the water depth measured by the piezometer, h _c is the initial buried elevation of the piezometer, and h′ is the tidal elevation measured by the water level gauge.

Preferably, the early-stage scour data of the bridge foundation includes the early-stage scour shape map, scour depth and scour range obtained by numerical simulation under different water level and flow velocity conditions by using the finite difference method.

Preferably, according to the water level and flow velocity collected by the data acquisition system, the data analysis module uses an interpolation method to process the scour shape data in the early stage, obtains a scour shape map under corresponding conditions, and extracts the scour shape map The difference between the original river bed elevation and the lowest elevation value at the point where the lowest elevation value is located is used as the numerical simulation to predict the scour depth value.

Preferably, the interpolation method is used to process the scour shape data in the early stage. Specifically, the least squares method is used to fit the scour shape map data, the water level and the flow velocity in the early stage to form a function about the scour shape map data, the water level and the flow speed; when The data acquisition system collects the current water level and flow velocity, and then substitutes it into the function to obtain the flushing depth and flushing shape diagram under the current water level and flow velocity.

Preferably, the data analysis module performs genetic algorithm fitting calculation according to the following formula, and each time the data acquisition system performs data collection, the data analysis module is iteratively fitted once again according to the following formula:

In the formula: h _b is the fitted predicted scour depth value, v is the flow velocity measured by the flow meter, v′ ₀ is the initial flow velocity of sediment, B is the water blocking width of the foundation of the bridge pier, H is the water level measured by the water level meter, and d is The median particle size of sediment, g is the acceleration of gravity, and k ₁ , k ₂ , and k ₃ are coefficients.

Preferably, the data evaluation module compares the maximum value among the monitoring point scour depth value, the numerical simulation predicted scour depth value and the fitting predicted scour depth value with a preset warning threshold, and when the maximum value is greater than the warning valve When the value is set, the bridge foundation health warning will be carried out in multiple levels according to the ratio of the maximum value to the warning threshold.

Preferably, the early warning release system further includes an expert diagnosis module, which is used to confirm the evaluation result of the data evaluation module and send an instruction to the early warning information push module.

The present invention includes at least the following beneficial effects:

1. The general-purpose bridge foundation local scour depth evaluation system provided by the present invention collects the real-time water depth, water level and flow velocity of the monitoring point through the data acquisition system, and calculates the scour depth value of the monitoring point, numerical simulation prediction scour depth value and Fitting the predicted scour depth value, the early warning release system evaluates the bridge foundation health warning level according to the maximum value between the monitoring point scour depth value, the numerical simulation predicted scour depth value and the fitted predicted scour depth value, and issues early warning information. Through real-time measurement data and bridge foundation scour data in the early stage, the bridge foundation scour form is predicted to quickly monitor the bridge foundation scour depth and distribution range, and accurately evaluate the bridge foundation health status, thereby protecting the bridge foundation safety.

2. The osmometer, water level gauge and flow meter in the universal bridge foundation local scour depth assessment system provided by the present invention are all lowered into the water through a retractable wire rope to replace the manual underwater auxiliary measurement, and the retractable wire rope can facilitate After each measurement is completed, the piezometer is recovered above the water surface or to the work surface to prevent the piezometer from being buried at the bottom of the bed due to sedimentation.

Other advantages, objects, and features of the present invention will appear in part from the description that follows, and in part will be appreciated by those skilled in the art from the study and practice of the invention.

Description of drawings

Fig. 1 is the system structure diagram of the bridge foundation local scour depth assessment system described in the present invention;

FIG. 2 is a schematic diagram of the scour shape diagram described in the present invention.

Detailed ways

The present invention will be further described in detail below with reference to the accompanying drawings, so that those skilled in the art can implement it with reference to the description.

It should be noted that the experimental methods described in the following embodiments are conventional methods unless otherwise specified, and the reagents and materials can be obtained from commercial sources unless otherwise specified; in the description of the present invention, The terms "landscape", "portrait", "top", "bottom", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", The orientation or positional relationship indicated by "inside" and "outside" is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the indicated device or element must have The particular orientation, construction and operation in the particular orientation are therefore not to be construed as limitations of the invention.

As shown in Figure 1, the present invention provides a general-purpose bridge foundation local scour depth assessment system, including:

A data acquisition system, which is used to collect the water depth, water level and flow velocity of the monitoring point;

A data processing system, which includes a data storage module, a data preprocessing module and a data analysis module; the data storage module is connected with the data acquisition system to store the monitoring point data collected by the data acquisition system and the early scour of the bridge foundation data; the data analysis module obtains data from the data storage module, calculates the scour depth value of the monitoring point, and obtains the numerical simulation predicted scour depth value and the fitting predicted scour depth value through numerical simulation calculation and genetic algorithm fitting calculation respectively;

An early warning release system, which includes a data evaluation module and an early warning information push module, the data evaluation module obtains the monitoring point scour depth value, the numerical simulation predicted scour depth value and the fitting predicted scour depth value from the data analysis module, and takes one of the The maximum value is used to evaluate the basic health early warning level of the bridge; the early warning information push module issues early warning information according to the early warning level.

In the above technical solution, the data acquisition system uses monitoring equipment to collect water depth, water level and flow velocity data at monitoring points on the basis of the bridge. Further, the data acquisition system includes a data acquisition device and a data transmission device; the data acquisition The device is arranged on both sides of the bridge pier, including a osmometer, a water level meter and a flow meter. The osmometer is used to measure the water depth, the water level meter is used to measure the tide level or the water level, and the flow meter is used to measure the flow rate of the monitoring point. . The osmometer, the water level gauge and the flow meter are all lowered into the water through a retractable wire rope to replace the manual underwater auxiliary measurement. In order to prevent the wire rope from being inclined by the disturbance of the water flow, an inclinometer is provided on the wire rope where the piezometer is lowered to monitor its inclination angle, and a counterweight is connected to the bottom of the piezometer. In order to prevent the piezometer from being buried at the bottom of the bed due to sedimentation, after each measurement, the piezometer is recovered to above the water surface or to the work surface through a retractable wire rope, and is to be monitored for the next time. Then lower down to the river/seabed. The data transmission device includes a network regulator, and the network regulator adopts wireless Ethernet to receive the data collected by the data acquisition device and transmit it to the data storage module. Preferably, the data storage module also stores bridge infrastructure information, the location of the data acquisition device and the basic new type of equipment.

The early-stage scour data of the bridge foundation includes the early-stage scour shape map, scour depth and scour range obtained by numerical simulation under different water level and flow velocity conditions by using the finite difference method, that is, in the previous hydrological data, the water level and flow rate are at normal values. Based on the data within the range, the finite difference method is used to numerically simulate the scouring conditions near the bridge pier according to different water levels and flow velocity conditions. Morphology, scour depth and scour range. The scour shape map refers to the topographic map of the river bed after being scoured by water flow, including the plane position coordinates and the elevation of the river bed, and is generally displayed by a contour map, as shown in Figure 2.

The data analysis module obtains the monitoring point data and the early scour data of the bridge foundation from the data storage module. Preferably, the data analysis module further includes performing analysis on abnormal data significantly exceeding the normal value area of the water level, flow velocity or scour depth. cull.

The scour depth value h _j of the monitoring point in the data analysis module is calculated as follows:

h _j =h _s -h _c -h' (1)

In formula (1): h _s is the water depth measured by the piezometer, h _c is the initial buried elevation of the piezometer, and h′ is the tidal elevation measured by the water level gauge.

According to the water level and flow velocity collected by the data acquisition system, the data analysis module uses interpolation to process the scour shape data in the early stage, obtains a scour shape map under corresponding conditions, and extracts the minimum elevation value in the scour shape map. , and the difference between the original riverbed elevation at the point where the elevation minimum is located and the minimum elevation value is used as the numerical simulation to predict the scour depth value. That is, the point corresponding to the lowest elevation value in the scour pattern map is the maximum scour depth point, such as point G shown in FIG. 2 . In the above process, the interpolation method is used to process the data of the scour shape in the early stage. Specifically, the least squares method is used to fit the data of the scour shape map, the water level and the flow velocity in the early stage to form a function about the data of the scour shape map, the water level and the flow rate; The data acquisition system collects the current water level and flow velocity, and then substitutes it into the function to obtain the flushing depth and flushing shape diagram under the current water level and flow velocity.

The data analysis module performs the genetic algorithm fitting calculation as follows to obtain the fitted predicted scour depth value,

In formula (2): h _b is the fitted predicted scour depth value, v is the flow velocity measured by the flow meter, v′ ₀ is the initial flow velocity of sediment, B is the water blocking width of the pier foundation, and H is the water level measured by the water level meter , d is the median particle size of sediment, g is the acceleration of gravity, and k ₁ , k ₂ , and k ₃ are coefficients.

Each time the data acquisition system performs data acquisition, the data analysis module re-fits iteratively once according to formula (2) to obtain updated k ₁ , k ₂ , and k ₃ coefficients, so as to obtain a more accurate fitting prediction flush depth value.

The data evaluation module compares the maximum value among the monitoring point scour depth value, the numerical simulation predicted scour depth value, and the fitting predicted scour depth value obtained by the data analysis module with the preset warning threshold, and when the maximum value is When it is greater than the warning threshold, the bridge foundation health warning will be carried out in multiple levels according to the ratio of the maximum value to the warning threshold.

Preferably, the warning levels can be divided into three levels: when the maximum value is greater than the warning threshold, it is a first-level warning; when the maximum value accounts for 70% of the warning threshold, it is a second-level warning; when the maximum value accounts for 70% of the warning threshold, it is a second-level warning; 30% of the alert threshold is a three-level warning.

The early warning release system further includes an expert diagnosis module, which is used to confirm the evaluation result of the data evaluation module and send an instruction to the early warning information push module. The expert diagnosis module is for experts to judge whether the scour depth data, the evaluation conclusion and the early warning classification are accurate. The early warning information push module can use various forms to publish the early warning information, such as system interface information push, early warning sound prompt or short message push, etc., which are not limited here.

Considering the friendliness of human-computer interaction, the general-purpose bridge foundation local scour depth assessment system may further include an operation interface and a display interface.

Although the embodiment of the present invention has been disclosed as above, it is not limited to the application listed in the description and the embodiment, and it can be applied to various fields suitable for the present invention. For those skilled in the art, it can be easily Therefore, the invention is not limited to the specific details and illustrations shown and described herein without departing from the general concept defined by the appended claims and the scope of equivalents.

Claims (10)

1. a general-purpose bridge foundation local scour depth assessment system, is characterized in that, comprises: A data acquisition system, which is used to collect the water depth, water level and flow velocity of the monitoring point; a data processing system, which includes a data storage module and a data analysis module; the data storage module is connected to the data acquisition system to store the monitoring point data collected by the data acquisition system and the early scour data of the bridge foundation; the data The analysis module obtains data from the data storage module, calculates the scour depth value of the monitoring point, and obtains the numerical simulation predicted scour depth value and the fitting predicted scour depth value through numerical simulation calculation and genetic algorithm fitting calculation respectively; An early warning release system, which includes a data evaluation module and an early warning information push module, the data evaluation module obtains the monitoring point scour depth value, the numerical simulation predicted scour depth value and the fitting predicted scour depth value from the data analysis module, and takes one of the The maximum value is used to evaluate the basic health early warning level of the bridge; the early warning information push module issues early warning information according to the early warning level. 2. The general-purpose bridge foundation local scour depth assessment system according to claim 1, wherein the data acquisition system comprises a data acquisition device and a data transmission device; the data acquisition device is arranged on both sides of the bridge pier, and the The data transmission device includes a network regulator, and the network regulator receives the data collected by the data acquisition device and transmits it to the data storage module. 3. The general-purpose bridge foundation local scour depth assessment system according to claim 2, wherein the data acquisition device comprises a osmometer, a water level meter and a flow meter, and the osmometer, the water level meter and the The flow meters are all lowered into the water through a retractable wire rope, wherein an inclinometer is arranged on the wire rope on which the osmometer is lowered, and a counterweight is connected to the bottom of the osmometer. 4. The general-purpose bridge foundation local scour depth assessment system as claimed in claim 1, is characterized in that, described monitoring point scour depth value h _j is calculated as follows: h _j =h _s -h _c -h' where h _s is the water depth measured by the piezometer, h _c is the initial buried elevation of the piezometer, and h′ is the tidal elevation measured by the water level gauge. 5. The general-purpose bridge foundation local scour depth assessment system according to claim 2, wherein the early scour data of the bridge foundation comprises the early scour shape obtained by numerical simulation calculation under different water level and flow velocity conditions by using the finite difference method Figure, scour depth and scour extent. 6. The general-purpose bridge foundation local scour depth assessment system according to claim 5, wherein the data analysis module adopts an interpolation method to carry out the scour shape data in the early stage according to the water level and flow velocity collected by the data acquisition system. process, obtain the scour shape map under the corresponding conditions, extract the minimum elevation value in the scour shape map, and use the difference between the original riverbed elevation and the minimum elevation value at the point where the minimum elevation value is located as the numerical simulation to predict the scour depth value . 7. The general-purpose bridge foundation local scour depth assessment system as claimed in claim 6, characterized in that, adopting interpolation method to process the scour shape data in the early stage is specifically: adopting the least squares method to analyze the scour shape map data, water level and flow velocity in the early stage. Fitting is performed to form a function about the scour shape map data, water level and flow velocity; when the data acquisition system collects the current water level and flow velocity, it is substituted into the function to obtain the scour depth and flow velocity under the current water level and flow velocity. Erosion pattern diagram. 8. The general-purpose bridge foundation local scour depth assessment system as claimed in claim 1, wherein the data analysis module performs genetic algorithm fitting calculation as follows, and the data acquisition system performs data acquisition every time, The data analysis modules are all iteratively fitted once again as follows:

In the formula: h _b is the fitted predicted scour depth value, v is the flow velocity measured by the flow meter, v′ ₀ is the initial flow velocity of sediment, B is the water blocking width of the foundation of the bridge pier, H is the water level measured by the water level meter, and d is The median particle size of sediment, g is the acceleration of gravity, and k ₁ , k ₂ , and k ₃ are coefficients. 9. The general-purpose bridge foundation local scour depth evaluation system according to claim 1, wherein the data evaluation module compares the monitoring point scour depth value, the numerical simulation predicted scour depth value and the fitting predicted scour depth value. The maximum value is compared with the preset warning threshold, and when the maximum value is greater than the warning threshold, the bridge foundation health warning is carried out in multiple levels according to the ratio of the maximum value to the warning threshold. 10. The general-purpose bridge foundation local scour depth assessment system according to claim 9, wherein the early warning release system further comprises an expert diagnosis module, and the expert diagnosis module is used to confirm the assessment result of the data assessment module , and send an instruction to the early warning information push module.

Images