CN110715632B - Special terminal for prediction and early warning of local scouring depth of pier of estuary of strong tide - Google Patents
Special terminal for prediction and early warning of local scouring depth of pier of estuary of strong tide Download PDFInfo
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Abstract
The invention discloses a special terminal for prediction and early warning of local scour depth of a pier of a strong-tide estuary pier, which comprises an input device, an output device, a memory and a processor, wherein the memory and the processor can obtain a scour depth prediction value. When the predicted value of the formula 1 exceeds the corresponding early warning value, a warning prompt or a loudspeaker sound signal on a screen is provided, so that a user can take measures on the bridge pier, such as emergency stone throwing, reinforcement and the like. The predicted value of the device is well matched with the measured value and the local scouring test value under the action of other trends, the indoor test data can be better reflected by the formula 1, and the better verification of the measured value of the Hangzhou Bay bridge, the Shantou Ma sea-crossing bridge and the test value of the Jiangsu Sutong Changjiang river bridge is obtained, so that the rationality and the reliability of the device are further verified. In addition, the invention does not need an acoustic probe, thereby avoiding the interference of water, sand and the like.
Description
Technical Field
The invention relates to a bridge pier safety early warning system, in particular to a special terminal for predicting and early warning the local scouring depth of a bridge pier of a strong-tide estuary bay.
Background
According to the accumulation of experience, factors influencing the health of the bridge pier are many: the first is the water-sand factor, including the advancing flow speed, the depth of water, the grain size of silt, the gradation of silt grains, the bed sand viscosity and the like; and the other bridge pier factors comprise the shape of the bridge pier, the width of the water-facing surface of the bridge pier, the length of the bridge pier, the included angle between the bridge pier and the water flow direction and the like. Through long-term research, water flow scouring is a main factor causing instability of a bridge pile foundation, and is caused by that the axial force transmitted by an upper structure is eccentric, bending moment is increased and instability is caused due to the fact that peripheral seabed of a pier in an estuary bay is scoured and eroded by water flow scouring, a base is scoured to different degrees, the center of gravity of the cross section of the base is shifted, and the axial force is transmitted by the upper structure. Therefore, the local scouring of the bridge piers forms a hidden danger to the bridge safety, the depth of the bridge piers is accurately predicted in time, and early warning is provided, so that the bridge construction safety operation is ensured.
For a long time, in order to predict the local scouring depth of the bridge pier, most of the science and technology workers obtain less than 50 prediction formulas from different ways and assumptions, and the prediction formulas are obtained by determining corresponding undetermined coefficients according to a generalized physical model test of a laboratory through certain theoretical analysis. Because the water flow structure around the pier is complex, various influencing factors interact and are correlated with each other, even each factor has certain uncertainty due to different test conditions, and in addition, the cognition level of people on the sediment is limited, the prediction formulas can not completely and truly reflect the actual physical process, and the maximum scouring depth of the pier is difficult to accurately predict. Even if the scouring depth calculation formula recommended by the specification is adopted, the calculation assumed conditions are harsh, the parameters are selected artificially, and the like, so that the calculated or selected parameters of different persons are inconsistent, and the difference of the calculated results is even very large. Although the scouring model experiment is carried out on the individual oversize bridges to obtain the scouring depth, the manpower and material costs of the model experiment are high. Especially in strong tide waters such as Hangzhou bay, the prediction difficulty is greatly increased due to complex factors such as large river bed rushing and silting, high sand concentration of the water body and the like, and a more reliable prediction device is needed.
Disclosure of Invention
The invention aims to provide a special terminal for predicting and early warning the local scouring depth of a pier of a strong tidal estuary in the prior art, which has the advantages of good rationality, high reliability of a predicted value, convenience in early warning and few interference factors.
The technical scheme adopted by the invention for solving the technical problems is as follows: the special terminal for predicting and early warning the local scouring depth of the bridge pier of the estuary of the strong tide comprises an input device, an output device and a control device,
the memory is used for storing input and/or preset operation parameters;
a processor for processing the operation parameters in the memory according to equation 1:
operation results in hb(ii) a And the communication module can carry out wired and/or wireless communication with the outside and is used for receiving external equipment data and storing the external equipment data into a memory or participating in operation in the operation parameters of the formula 1.
H is to bebAnd comparing with a preset early warning value.
Acquiring the full-tide maximum water depth h (water depth under natural conditions without being influenced by the scoured pit) recorded by an external water depth detection device through a communication module, wherein the average water blocking width B under the full-tide maximum water depth condition can be manually input according to the form of the building; d50The average median particle size of the riverbed silt can be obtained by searching according to a silt particle distribution curve of riverbed sampling data; the value of the parameter w is 5-20, the value u is the maximum flow rate of the full tide, the parameter w is obtained by a flow rate meter and is input into a memory in a manual or wireless transmission mode; k is a radical of1Strip type k for foundation pile plane layout coefficient11.0, plum blossom type k1＝0.862；k2For vertical arrangement coefficient of foundation piles, vertical piles k21.0, oblique pile k21.176, manually entered, preset or retrieved from the server using a communication module. The predicted value of the device is well matched with the measured value and the local scouring test value under the action of other trends, the indoor test data can be better reflected by the formula 1, and the better verification of the measured value of the Hangzhou Bay bridge, the Shantou Ma sea-crossing bridge and the test value of the Jiangsu Sutong Changjiang river bridge is obtained, so that the rationality and the reliability of the device are further verified. In addition, the invention does not need an acoustic probe, thereby avoiding the interference of water, sand and the like.
In order to optimize the technical scheme, the adopted measures further comprise:
the input device comprises a wireless module, and the wireless module can collect the full tide maximum water depth h (the water depth under the natural condition without being influenced by the scoured pit) measured by the external source water depth measuring module. And the wireless module is adopted to obtain the parameters, so that the convenience and the real-time performance can be improved.
Average median particle size d of riverbed silt50Is a preset value or an input value; k is a radical of1Is in the range of 0.5 to 1.0, k2The value range of (a) is 1.0 to 1.5; the average water blocking width B and/or the maximum flow speed u of the full tide under the maximum water depth condition of the full tide are input values. The terminal can be a mobile phone, a tablet computer or a mobile computer, and has portability.
a1A value of 0.2 to 0.4; a is2The value is 0.1 to 0.2; a is3The value is 0.5 to 0.7.
The terminal also has a GPS module.
The processor is connected with the memory, the communication module and the GPS module in a bus mode; the processor is also connected with an input device and an output device respectively; the input device comprises a mouse or a keyboard or a touch screen; the output device includes a screen and/or a speaker. The parameters which are input by people and need to be input are input or set and adjusted through the input device. The input parameters in equation 1 are mostly obtained from the server with the communication module to improve efficiency. On different GPS areas, for hbThe calculation result of (2) should be set with preset early warning value as required, and the set of the early warning value can be stored in the server, or can be directly preset in the memory or manually set and modified. When h is generatedbIf the corresponding early warning value is exceeded, a warning prompt or a loudspeaker sound signal on a screen is needed so that a user can take measures such as emergency stone throwing, reinforcement and the like.
The storage also stores a silt particle distribution curve; the processor can inquire corresponding d from the silt particle distribution curve according to the position information provided by the GPS module50And storing the parameter d in the memory50. Through year-by-year accumulation of data, geographic information is formed and is merged into the system, and the effects of calculation according to needs and real-time calculation are achieved. If the hydrological condition changes, real-time prediction data can be generated in time, and dangerous cases can be forecasted in time.
The communication module can be used for connecting the GPS moduleAnd the provided position information is adapted to obtain a sand grain distribution curve of the external equipment and is stored in a memory. Namely, according to different positions of GPS positioning, the position of the water area where the measuring position is located can be judged, and the communication module sends a data request to the cloud server, so that a proper silt particle distribution curve is found according to the pre-measured information stored in the cloud server, and a proper d is obtained50And the numerical value is sent back to the communication module, and then the communication module transmits the corresponding numerical value to the memory so as to participate in operation.
Because the invention adopts the memory, the processor and the communication module, the accurate predicted value h can be obtained after data acquisition and the operation of the formula 1b. The predicted value of the device is well matched with the measured value and the local scouring test value under the action of other trends, the indoor test data can be better reflected by the formula 1, and the better verification of the measured value of the Hangzhou Bay bridge, the Shantou Ma sea-crossing bridge and the test value of the Jiangsu Sutong Changjiang river bridge is obtained, so that the rationality and the reliability of the device are further verified. In addition, the invention does not need an acoustic probe, thereby avoiding the interference of water, sand and the like. Meanwhile, according to the comparison with the preset early warning value, early warning is timely provided for bridge safety. Therefore, the method has the advantages of good rationality, high reliability of predicted values, convenience in early warning and few interference factors.
Drawings
FIG. 1 is a schematic diagram of a module connection structure according to an embodiment of the present invention;
FIG. 2 is a diagram illustrating the process of the depth of a washout pit over time according to an embodiment of the present invention;
FIG. 3 is a diagram illustrating the actual measurement variation process of the depth of the erosion pit according to the embodiment of the present invention;
FIG. 4 is a diagram showing a main pier washout pit according to the embodiment of the present invention;
fig. 5 is a comparison between the predicted value and the measured value and the experimental value of the terminal according to the embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the following examples.
Example (b): referring to fig. 1 to 4, the special terminal for prediction and early warning of local scour depth of a pier of a strong tidal estuary comprises an input device and an output device, and further comprises,
a memory for storing input and/or preset operation parameters
A processor for obtaining h from the operation parameter in the memory by the operation of formula 1b；
H is to bebAnd comparing with a preset early warning value.
And the communication module can carry out wired and/or wireless communication with the outside and is used for receiving external equipment data and storing the external equipment data into a memory or participating in operation in the operation parameters of the formula 1. Acquiring the full-tide maximum water depth h (water depth under natural conditions without being influenced by the scoured pit) recorded by an external water depth detection device through a communication module, wherein the average water blocking width B under the full-tide maximum water depth condition can be manually input according to the form of the building; d50The average median particle size of the riverbed silt can be obtained by searching according to a silt particle distribution curve of riverbed sampling data; the value of the parameter w is 5-20, the value u is the maximum flow rate of the full tide, the parameter w is obtained by a flow rate meter and is input into a memory in a manual or wireless transmission mode; k is a radical of1Strip type k for foundation pile plane layout coefficient11.0, plum blossom type k1＝0.862；k2For vertical arrangement coefficient of foundation piles, vertical piles k21.0, oblique pile k21.176, manually entered, preset or retrieved from the server using a communication module. The predicted value of the device is well matched with the measured value and the local scouring test value under the action of other trends, the indoor test data can be better reflected by the formula 1, and the better verification of the measured value of the Hangzhou Bay bridge, the Shantou Ma sea-crossing bridge and the test value of the Jiangsu Sutong Changjiang river bridge is obtained, so that the rationality and the reliability of the device are further verified. In addition, the invention does not need an acoustic probe, thereby avoiding the interference of water, sand and the like.
The input device comprises a wireless module, and the wireless module can collect the full tide maximum water depth h (the water depth under the natural condition without being influenced by the scoured pit) measured by the external source water depth measuring module. And the wireless module is adopted to obtain the parameters, so that the convenience and the real-time performance can be improved.
Average median diameter d of riverbed silt50Is a preset value or an input value; k is a radical of1Value range ofThe circumference is 0.5 to 1.0, k2The value range of (a) is 1.0 to 1.5; the average water blocking width B and/or the maximum flow speed u of the full tide under the maximum water depth condition of the full tide are input values. The terminal can be a mobile phone, a tablet computer or a mobile computer, and has portability.
a1A value of 0.2 to 0.4; a is2The value is 0.1 to 0.2; a is3The value is 0.5 to 0.7. Preferably, a is used1＝0.326、a2The calculation results of 0.167 and a3 and 0.628 are more accurate.
The terminal also has a GPS module.
The processor is connected with the memory, the communication module and the GPS module in a bus mode; the processor is also connected with an input device and an output device respectively; the input device comprises a mouse or a keyboard or a touch screen; the output device includes a screen and/or a speaker. The parameters which are input by people and need to be input are input or set and adjusted through the input device. The input parameters in equation 1 are mostly obtained from the server with the communication module to improve efficiency. On different GPS areas, for hbThe calculation result of (2) should be set with preset early warning value as required, and the set of the early warning value can be stored in the server, or can be directly preset in the memory or manually set and modified. When h is generatedbIf the corresponding early warning value is exceeded, a warning prompt or a loudspeaker sound signal on a screen is needed so that a user can take measures such as emergency stone throwing, reinforcement and the like.
The storage also stores a silt particle distribution curve; the processor can inquire corresponding d from the silt particle distribution curve according to the position information provided by the GPS module50And storing the parameter d in the memory50. Through year-by-year accumulation of data, geographic information is formed and is merged into the system, and the effects of calculation according to needs and real-time calculation are achieved. If the hydrological condition changes, real-time monitoring data can be generated in time, and dangerous cases can be forecasted in time.
The communication module can adapt the position information provided by the GPS module to obtain the sand grain distribution curve of the external equipment and store the sand grain distribution curve in the memory. Namely, the position of the water area where the measuring position is located can be judged according to different positions of GPS positioning, the communication module sends a data request to the cloud server,therefore, a silt particle distribution curve of the matter is found according to the pre-measured information stored in the cloud server, and a proper d is obtained50And the numerical value is sent back to the communication module, and then the communication module transmits the corresponding numerical value to the memory so as to participate in operation.
hbNamely the local scouring depth (including general scouring and local scouring) of the pier under the action of the tidal current; the operation parameters are as follows: h is the full tidal maximum water depth (water depth under natural conditions not affected by the scoured pits); b is the average water-blocking width under the full-tide maximum water depth condition; d50The average median particle size of the riverbed silt can be obtained by searching according to a silt particle distribution curve of riverbed sampling data; u is the full tidal maximum flow rate; k is a radical of1Strip type k for foundation pile plane layout coefficient11.0, plum blossom type k1＝0.862；k2For vertical arrangement coefficient of foundation piles, vertical piles k21.0, oblique pile k2＝1.176。a1A value of 0.2 to 0.4; a is2The value is 0.1 to 0.2; a is3The value of the parameter w is 0.5 to 0.7, and the value of the parameter w is 5 to 20. When h is generatedbIf the early warning value exceeds the corresponding preset early warning value, a warning prompt or a loudspeaker sound signal on a screen is provided, so that a user can take measures on the bridge pier, such as emergency stone throwing, reinforcement and the like. If the hydrological condition changes, the device can generate real-time prediction data in time and forecast dangerous situations in time.
While the invention has been described in connection with a preferred embodiment, it is not intended to limit the invention, and it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the spirit and scope of the invention.
Claims (1)
1. The special terminal for prediction and early warning of the local scouring depth of the bridge pier of the strong tidal estuary comprises an input device and an output device, and is characterized in that: also comprises the following steps of (1) preparing,
the memory is used for storing input and/or preset operation parameters;
a processor for converting the operations described in the memoryParameters are shown in formula 1:
operation results in hb；
The communication module can carry out wired and/or wireless communication with the outside and is used for receiving external equipment data and storing the external equipment data into the memory or participating in operation in the operation parameters of the formula 1;
the input device comprises a wireless module, and the wireless module can collect the full tide maximum water depth h measured by the external source water depth measuring module;
the average median diameter d of the riverbed silt50Is a preset value or an input value; k is as described1The value of (a) is in the range of 0.5 to 1.0, and k is2The value range of (a) is 1.0 to 1.5; the average water blocking width B and/or the maximum flow speed u of the full tide under the maximum water depth condition of the full tide are input values; h isbNamely the local scouring depth of the pier under the action of tidal current, wherein the local scouring depth comprises general scouring and local scouring; h is the maximum water depth of the full tide under the natural condition without being influenced by the scoured pit; b is the average water-blocking width under the full-tide maximum water depth condition; d50The average median particle size of the riverbed silt can be obtained by searching according to a silt particle distribution curve of riverbed sampling data; u is the full tidal maximum flow rate; k is a radical of1Strip type k for foundation pile plane layout coefficient11.0, plum blossom type k1＝0.862；k2For vertical arrangement coefficient of foundation piles, vertical piles k21.0, oblique pile k21.176; the value of the parameter w is 5 to 20; a is described1The value is 0.4; a is described2The value is 0.2; a is described3The value is 0.7;
the terminal is also provided with a GPS module;
when h is generatedbIf the corresponding early warning value is exceeded, a warning prompt and/or a loudspeaker sound signal on a screen exists;
when the hydrological condition changes, the terminal can generate real-time prediction data in time and forecast dangerous situations in time;
the processor is connected with the memory, the communication module and the GPS module in a bus mode; the processor is also connected with an input device and an output device respectively; the input device comprises a mouse, a keyboard or a touch screen; the output device comprises a screen and/or a loudspeaker;
the storage is also stored with a silt particle distribution curve; the processor can inquire the corresponding d from the silt particle distribution curve according to the position information provided by the GPS module50And storing the parameter d in the memory50；
The communication module can adapt the position information provided by the GPS module to obtain a silt particle distribution curve of the external equipment and store the silt particle distribution curve in the memory; according to different positions of GPS positioning, the position of the water area where the measurement position is located is judged, and the communication module sends a data request to the cloud server, so that a proper silt particle distribution curve is found according to the pre-measurement information stored in the cloud server, and a proper d is obtained50And the numerical value is sent back to the communication module, and then the communication module transmits the corresponding numerical value to the memory so as to participate in operation.
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