CN114674471A - A method and system for monitoring and early warning of unbalanced moment of prestressed concrete continuous beam - Google Patents

Abstract

The invention relates to a method and system for monitoring and early warning of unbalanced moment of a prestressed concrete continuous beam. The pressure borne by the temporary support of the pier top is collected by a sensor and transmitted to a controller. The controller performs analog-to-digital conversion processing on the input signal, and calculates The unbalanced moment of the cantilever on both sides, when the unbalanced moment exceeds the limit, an alarm signal will be sent through the alarm device; the controller will also send the data to the backyard computer or mobile terminal for display and storage. The invention can realize real-time monitoring and real-time warning of unbalanced moment during cantilever construction of prestressed concrete continuous girder bridge, effectively solve the construction problems that unbalanced moment is difficult to quantify, monitor and manage on site during cantilever construction, and can significantly improve the The current level of bridge engineering management.

Description

A method and system for monitoring and early warning of unbalanced moment of prestressed concrete continuous beam

technical field

The invention belongs to the technical field of bridge construction, and in particular relates to a method and a system for monitoring and prewarning the unbalanced loads at both ends of a continuous beam during the suspension-casting construction of a continuous beam of a bridge.

Background technique

The construction of prestressed concrete continuous girder bridge usually adopts the construction method of hanging basket cantilever pouring and segment cantilever assembly. In order to ensure that the cantilever beam sections on both sides of the pier column are always in a relatively balanced state during the construction process, it is necessary to set up temporary consolidation systems on both sides of the permanent supports on the pier top along the longitudinal bridge direction. It consists of supports and tensile steel bars.

The bridge design documents usually specify the maximum unbalanced moment allowed during the construction phase of the continuous beam (the maximum value of the product of the unbalanced load and the beam cantilever length), which is controlled by the construction party during the construction process. The specific control measures are generally to limit the bridge deck. Loading, symmetrical and alternating concrete pouring of cantilevered beam sections on both sides, etc.

According to the traditional method to control the unbalanced load, it can only be estimated qualitatively by experience, and the accuracy is low. In actual construction, it is very difficult to control the unbalanced moment at the construction site, and major safety accidents occur frequently.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a monitoring and early warning method and system with high timeliness, safety and convenience, which can monitor the unbalance at both ends of the cantilever in real time, aiming at the problem that the unbalanced moment is difficult to control during the cantilever construction stage of the prestressed concrete continuous girder bridge. torque to ensure construction safety.

A method for monitoring and early warning of unbalanced moment of a prestressed concrete continuous beam provided by the present invention is characterized in that, it includes the following steps:

(1) Data collection: The pressure on the temporary supports on both sides of the bridge pier top is collected by sensors, and the collected information is transmitted to the controller;

(2) Data processing: The controller performs analog-to-digital conversion processing on the information from the sensor, and calculates the unbalanced moment of the cantilever corresponding to the temporary support on both sides of the pier top according to the processed data, and compares it with the preset maximum Unbalanced torque comparison, if it reaches a certain limit, an alarm signal will be sent through the alarm device;

(3) The controller simultaneously transmits the data obtained after analog-to-digital conversion processing to the back-end computer or mobile terminal through the wireless sending module for display and storage.

According to the above method, the present invention also provides a prestressed concrete continuous beam unbalanced moment monitoring and warning system, which is characterized in that: it includes a data acquisition module, a data processing module, an overrun warning module, a data display and a storage module, wherein:

The data acquisition module adopts the FSR force-sensitive sensor based on the resistance strain effect or the piezoelectric sensor based on the piezoelectric effect, which is embedded in the temporary supports on both sides of the pier top, and is electrically connected with the input interface of the data processing module; The module collects the pressure on the temporary supports on both sides of the bridge pier top and transmits it to the data processing module;

The data processing module integrates a single-chip microcomputer, a signal amplifying circuit, an A/D conversion chip, and a triode, and is arranged in the 0# inner box or the 0# top surface weatherproof shed, and its output interface is connected to the overrun warning module through the triode; The data processing module first linearly amplifies the electrical signal input by the data acquisition module through the signal amplifying circuit, and then converts the electrical signal into a digital signal through the A/D conversion chip. Multiply the values to obtain the torque of the two cantilevers, and then subtract the two torques to obtain the unbalanced torque value on both sides, and compare the calculation result with the pre-stored maximum unbalanced torque limit in the microcontroller. If the unbalanced torque is greater than 80% of the limit value, the output is low level to the triode, and the triode is turned on. If the calculated unbalanced torque is less than or equal to 80% of the limit value, the output is high level, and the triode does not conduct. The data processing module simultaneously sends the digital signal converted by A/D to the data display and storage module by wireless;

The over-limit warning module adopts a buzzer or an alarm light, which is set on the top surface of the 0# block or the construction point of the cantilever beam section. When the data processing module outputs a low level, the buzzer or the alarm light sends out an alarm signal;

The data display and storage module is a computer terminal or mobile terminal of relevant personnel arranged in the backyard office, pre-installed with data analysis software, which performs secondary analysis and processing on the data sent by the data processing module, and displays it on its own display screen. It can be displayed in real time on the terminal, and the display method includes the “unbalanced torque-time” development curve based on the local time of the terminal, or directly display the data value of the unbalanced torque; at the same time, the computer terminal and the mobile terminal store the data for later analysis.

In the invention, the data acquisition module is embedded in the temporary support, the mechanical force is converted into an electrical signal, the input signal is processed and analyzed through the data processing module, and the analysis result is output to the real-time overrun warning module and the data display and storage module. It can realize real-time monitoring and real-time early warning of unbalanced moment during cantilever construction of prestressed concrete continuous girder bridge, effectively solve the construction problems that unbalanced moment is difficult to quantify, monitor and manage in the cantilever construction stage, and can significantly improve the current bridge construction. Engineering management level.

Description of drawings

Fig. 1 is the method principle diagram of the present invention;

Figure 2 is a schematic diagram of the system structure of the present invention.

Detailed ways

As shown in Figure 1, a kind of prestressed concrete continuous beam unbalanced moment monitoring and early warning method provided by the present invention includes data collection, data processing and real-time overrun warning, and the specific embodiments are as follows:

(1) Data collection: The pressure on the temporary supports on both sides of the bridge pier top is collected by sensors, and the collected information is transmitted to the controller.

In the specific implementation, the FSR force sensor based on the resistance strain effect or the piezoelectric sensor based on the piezoelectric effect can be used to collect the pressure on the temporary supports on both sides of the bridge pier top, and the sensors are embedded in the temporary supports on both sides of the pier top. It is electrically connected with the controller to convert the mechanical pressure on the temporary supports on both sides into electrical signals and transmit them to the controller.

(2) Data processing: The controller performs analog-to-digital conversion processing on the information from the sensor, and calculates the unbalanced moment of the cantilever corresponding to the temporary support on both sides of the pier top according to the processed data, and compares it with the preset maximum Unbalanced torque comparison, if it reaches a certain limit, an alarm signal will be sent through the alarm device.

During specific implementation, the controller can be electrically connected to the alarm device through a triode; the pressure data of the two temporary supports collected by the controller are respectively multiplied by the corresponding cantilever length values to obtain the torque of the two cantilevers, and then the The two torques are subtracted to obtain the unbalanced torque value on both sides, and the calculation result is compared with the pre-stored maximum unbalanced torque limit in the controller. If the calculated unbalanced torque is greater than 80% of the limit, Then output a low level to the triode, and the alarm device sends out an alarm signal. If the calculated unbalanced torque is less than or equal to 80% of the limit value, it outputs a high level and the alarm device does not alarm.

(3) The controller simultaneously transmits the data obtained after analog-to-digital conversion processing to the back-end computer or mobile terminal through the wireless sending module for display and storage.

In specific implementation, data analysis software can be pre-installed on the computer or mobile terminal to perform secondary analysis and processing on the data sent by the controller, and display the analysis results in real time on the built-in display screen. The display method includes the local time based on the terminal. The "unbalanced torque-time" development curve graph, or directly display the unbalanced torque data value; at the same time, the computer terminal and the mobile terminal store the data for later analysis.

The present invention provides a prestressed concrete continuous beam unbalanced moment monitoring and warning system according to the above method, comprising a data acquisition module, a data processing module, an overrun warning module, a data display and a storage module, wherein:

The data acquisition module adopts the FSR force-sensitive sensor based on the resistance strain effect or the piezoelectric sensor based on the piezoelectric effect, which is embedded in the temporary supports on both sides of the pier top, and is electrically connected with the input interface of the data processing module; The module collects the pressure on the temporary supports on both sides of the bridge pier top and transmits it to the data processing module;

The data processing module integrates a single-chip microcomputer, a signal amplifying circuit, an A/D conversion chip, and a triode, and is arranged in the 0# inner box or the 0# top surface weatherproof shed, and its output interface is connected to the overrun warning module through the triode; The data processing module first linearly amplifies the electrical signal input by the data acquisition module through the signal amplifying circuit, and then converts the electrical signal into a digital signal through the A/D conversion chip. Multiply the values to obtain the torque of the two cantilevers, and then subtract the two torques to obtain the unbalanced torque value on both sides, and compare the calculation result with the pre-stored maximum unbalanced torque limit in the microcontroller. If the unbalanced torque is greater than 80% of the limit value, the output is low level to the triode, and the triode is turned on. If the calculated unbalanced torque is less than or equal to 80% of the limit value, the output is high level, and the triode does not conduct. The data processing module simultaneously sends the digital signal converted by A/D to the data display and storage module by wireless;

The over-limit warning module adopts a buzzer or an alarm light, which is set on the top surface of the 0# block or the construction point of the cantilever beam section. When the data processing module outputs a low level, the buzzer or the alarm light sends out an alarm signal;

The data display and storage module is a computer terminal or mobile terminal of relevant personnel arranged in the backyard office, pre-installed with data analysis software, which performs secondary analysis and processing on the data sent by the data processing module, and displays it on its own display screen. It can be displayed in real time on the terminal, and the display method includes the “unbalanced torque-time” development curve based on the local time of the terminal, or directly display the data value of the unbalanced torque; at the same time, the computer terminal and the mobile terminal store the data for later analysis.

FIG. 2 is a schematic structural diagram of a specific implementation manner of the above system.

In Figure 2, the main girder cantilever of the prestressed concrete continuous girder bridge is under construction. Along the construction direction of the main girder cantilever, high-strength concrete compressive temporary supports are arranged on both sides of the main support 1 on the pier top. The piezoelectric sensor 2 based on the piezoelectric effect is buried; the cantilever beam sections on both sides transmit the pressure to the temporary support, and the mechanical pressure is converted into an electrical signal through the sensor 2, and the electrical signal generated by the sensor 2 is input into the controller 3;

The controller 3 integrates a signal amplifying circuit, an A/D conversion chip, a single-chip microcomputer, a triode, and the like. The input electrical signal is linearly amplified by the signal amplification circuit, and then converted into a digital signal by the A/D conversion chip. Process the digital signal to obtain the real-time unbalanced torque value, compare it with the preset unbalanced torque limit, and output a high level or a low level according to the comparison result, and the output level amplifies the current through the switching characteristics of the triode , and output the amplified current signal to the circuit of the overrun warning module;

The over-limit early warning module adopts buzzer 4 and traffic light 5, which are placed in conspicuous positions, such as the top surface of block 0#, beside the concrete drag pump, or the construction point of the cantilever beam section. When the controller 3 outputs a high level, the triode is turned off, the traffic light 5 gives a green light signal, the buzzer 4 does not sound, and the construction can be carried out normally; when the controller 3 outputs a low level, the triode is turned on, and the traffic light 5 gives a red signal. The light is on, the buzzer 4 sounds, and the real-time warning of over-limit is carried out.

The controller 3 simultaneously directly outputs the digital signal after A/D conversion to the wireless transmitting device 6, and the wireless transmitting device 6 sends the short message to the mobile terminal 7 or the computer terminal 8 by means of the GPRS/CDMA wireless transmission network in the form of a short message; The terminal 7 or the computer terminal 8 stores the received data in the memory, which can be read directly by the display, or can be drawn based on the "unbalanced torque value and time relationship diagram" through the pre-installed special data analysis software to realize real-time monitoring.

Claims (5)

1. a prestressed concrete continuous beam unbalanced moment monitoring early warning method, is characterized in that, comprises the following steps: (1) Data collection: The pressure on the temporary supports on both sides of the bridge pier top is collected by sensors, and the collected information is transmitted to the controller; (2) Data processing: The controller performs analog-to-digital conversion processing on the information from the sensor, and calculates the unbalanced moment of the cantilever corresponding to the temporary support on both sides of the pier top according to the processed data, and compares it with the preset maximum Unbalanced torque comparison, if it reaches a certain limit, an alarm signal will be sent through the alarm device; (3) The controller simultaneously transmits the data obtained after analog-to-digital conversion processing to the back-end computer or mobile terminal through the wireless sending module for display and storage. 2. The pre-stressed concrete continuous beam unbalanced moment monitoring and early warning method according to claim 1 is characterized in that: in the step (1), the FSR force-sensitive sensor based on the resistance strain effect or the pressure sensor based on the piezoelectric effect is adopted. The electrical sensor collects the pressure on the temporary supports on both sides of the bridge pier top, the sensor is embedded in the temporary supports on both sides of the pier top, and is electrically connected with the controller to convert the mechanical pressure on the temporary supports on both sides into electrical energy. signal, which is transmitted to the controller. 3. The prestressed concrete continuous beam unbalanced moment monitoring and early warning method according to claim 1, characterized in that: in step (2), the controller is electrically connected to the alarm device through a triode; The pressure data of each temporary support is multiplied by the corresponding cantilever length value to obtain the moment of the two cantilevers, and then the two moments are subtracted to obtain the unbalanced moment value on both sides. The stored maximum unbalanced torque limit is compared. If the calculated unbalanced torque is greater than 80% of the limit, it will output a low level to the triode, and the alarm device will issue an alarm signal. If the calculated unbalanced torque is less than or If it is equal to 80% of the limit value, it will output a high level, and the alarm device will not alarm. 4. The prestressed concrete continuous beam unbalanced moment monitoring and early warning method according to claim 1, characterized in that: in the step (3), the computer terminal or the mobile terminal pre-installed data analysis software, to the controller sent The data is subjected to secondary analysis and processing, and the analysis results are displayed on the built-in display screen in real time. The display method includes the "unbalanced torque-time" development curve based on the local time of the terminal, or directly displays the unbalanced torque data value; at the same time, The computer terminal and mobile terminal store the data for later analysis. 5. A prestressed concrete continuous beam unbalanced moment monitoring and warning system, characterized in that: comprising a data acquisition module, a data processing module, an overrun warning module, a data display and a storage module, wherein: The data acquisition module adopts the FSR force-sensitive sensor based on the resistance strain effect or the piezoelectric sensor based on the piezoelectric effect, which is embedded in the temporary supports on both sides of the pier top, and is electrically connected with the input interface of the data processing module; The module collects the pressure on the temporary supports on both sides of the bridge pier top and transmits it to the data processing module; The data processing module integrates a single-chip microcomputer, a signal amplifying circuit, an A/D conversion chip, and a triode, and is arranged in the 0# inner box or the 0# top surface weatherproof shed, and its output interface is connected to the overrun warning module through the triode; The data processing module first linearly amplifies the electrical signal input by the data acquisition module through the signal amplifying circuit, and then converts the electrical signal into a digital signal through the A/D conversion chip. Multiply the values to obtain the torque of the two cantilevers, and then subtract the two torques to obtain the unbalanced torque value on both sides, and compare the calculation result with the pre-stored maximum unbalanced torque limit in the microcontroller. If the unbalanced torque is greater than 80% of the limit value, the output is low level to the triode, and the triode is turned on. If the calculated unbalanced torque is less than or equal to 80% of the limit value, the output is high level, and the triode does not conduct. The data processing module simultaneously sends the digital signal converted by A/D to the data display and storage module by wireless; The over-limit warning module adopts a buzzer or an alarm light, which is set on the top surface of the 0# block or the construction point of the cantilever beam section. When the data processing module outputs a low level, the buzzer or the alarm light sends out an alarm signal; The data display and storage module is a computer terminal or mobile terminal of relevant personnel arranged in the backyard office, pre-installed with data analysis software, which performs secondary analysis and processing on the data sent by the data processing module, and displays it on its own display screen. It can be displayed in real time on the terminal, and the display method includes the “unbalanced torque-time” development curve based on the local time of the terminal, or directly display the data value of the unbalanced torque; at the same time, the computer terminal and the mobile terminal store the data for later analysis.

Images