Arch bridge suspender replacement construction monitoring method, system and device in open traffic state

Abstract

The invention discloses an arch bridge suspender replacement construction monitoring method, system and device in a traffic state, and the method comprises the steps: automatically collecting arch bridge monitoring data in a construction process stage and data of vehicles passing through an arch bridge, determining the impact data of the vehicles on the arch bridge through the vehicle data, and removing the impact data from the arch bridge monitoring data, clean monitoring data is obtained, so that the deformation condition of the arch bridge and the stress state of each component at the current stage are obtained, arch bridge suspender replacement construction monitoring in the open traffic state is achieved, rapid acquisition and processing of the control data are achieved, and the construction monitoring efficiency is greatly improved.

Description

Technical Field

[0001] The present invention relates to a method, system and device for monitoring the replacement of arch bridge hangers in an open-to-traffic state, and belongs to the technical fields of civil engineering, software engineering and electronic equipment. Background Art

[0002] As the primary load-bearing components of tied-arch bridges, hangers often suffer from defects such as PE sheath damage, steel wire corrosion and breakage, and anchor head corrosion during bridge operation, jeopardizing bridge safety. Current regulations stipulate a design service life of 20 years for hangers, leading to an increasing number of tied-arch bridge hanger replacements in recent years. Conventional hanger replacement work is performed while the bridge deck is closed to traffic. Manual data collection using electronic levels and cable dynamic meters is performed, followed by data analysis and final instructions. However, tied-arch bridges are often located on major arterial roads or at important intersections across rivers and lakes, where traffic pressure is high. The conflict between conventional bridge closures and vehicle traffic is becoming increasingly prominent. Furthermore, the efficiency of manual data collection and processing cannot meet the requirements for rapid hanger replacement. Therefore, there is an urgent need to resolve the conflict between construction and bridge deck traffic and to develop methods for rapidly collecting and processing monitoring data. Summary of the Invention

[0003] The present invention provides a method, system and device for monitoring the replacement of arch bridge hangers in an open-to-traffic state, which solve the problems disclosed in the background technology.

[0004] According to one aspect of the present disclosure, a method for monitoring the replacement of a suspender rod of an arch bridge in an open-to-traffic state is provided, comprising: Obtaining the arch bridge monitoring data and vehicle data passing through the arch bridge during the current phase; wherein the current phase is a sub-phase of the boom replacement construction phase; Determine the impact data of vehicles on arch bridges based on vehicle data and a pre-built impact database; Eliminate impact data from arch bridge monitoring data to obtain clean monitoring data; Based on the clean monitoring data, the deformation of the arch bridge and the stress state of each component at the current stage are obtained.

[0005] In some embodiments of the present disclosure, a method for constructing an influence database includes: Obtain arch bridge monitoring data when various types of vehicles pass through the arch bridge; The arch bridge monitoring data corresponding to the vehicle is used as the impact data of the vehicle on the arch bridge to build an impact database.

[0006] In some embodiments of the present disclosure, the method further includes an alarm step, which includes: Part of the clean monitoring data and the stress state are compared with the corresponding reference values of the current stage. If the comparison result meets the corresponding preset alarm rules, an alarm is issued.

[0007] In some embodiments of the present disclosure, the arch bridge monitoring data includes the vertical displacement of the bridge deck, the displacement of the arch rib, the displacement of the bottom of the beam, the displacement of the arch foot, the cable tension of the adjacent hangers of the hanger to be replaced, and the cable tension of the hanger to be replaced / new hanger; wherein the vertical displacement of the bridge deck, the displacement of the bottom of the beam and the cable tension of the hanger are compared with the corresponding reference values.

[0008] In some embodiments of the present disclosure, the deformation of the arch bridge and the stress state of each component at the current stage are obtained based on the clean monitoring data, including: According to the arch rib displacement, the arch rib linearity of the arch bridge at the current stage is obtained; According to the vertical displacement of the bridge deck, the deck linearity of the arch bridge at the current stage is obtained; The clean monitoring data is input into the pre-built finite element analysis model of the arch bridge to obtain the stress state of each component of the arch bridge at the current stage.

[0009] According to another aspect of the present disclosure, a construction monitoring system for replacing suspender rods of an arch bridge in an open-to-traffic state is provided, comprising: An acquisition module acquires the arch bridge monitoring data and vehicle data passing through the arch bridge at the current stage; wherein the current stage is a sub-stage of the boom replacement construction stage; An impact data determination module determines the impact data of vehicles on the arch bridge based on vehicle data and a pre-built impact database; Elimination module, which removes influencing data from the arch bridge monitoring data to obtain clean monitoring data; The situation status determination module obtains the deformation status of the arch bridge and the stress status of each component at the current stage based on the clean monitoring data.

[0010] According to another aspect of the present disclosure, a construction monitoring device for replacing arch bridge hangers in a traffic-open state is provided, comprising a vehicle data acquisition device, an arch bridge monitoring data acquisition device, a cloud platform, and an interactive terminal connected to the cloud platform. The cloud platform uses the above-mentioned method to perform construction monitoring, and the interactive terminal displays the data and results of the construction monitoring process.

[0011] In some embodiments of the present disclosure, the vehicle data acquisition device is a camera that is arranged outside the arch bridge and whose camera range can cover the entire bridge deck.

[0012] In some embodiments of the present disclosure, an arch bridge monitoring data acquisition device includes a pressure differential static level, a measuring robot, a three-axis accelerometer, and a pressure ring; A pressure differential static level is installed on the bridge deck to measure the vertical displacement of the bridge deck. The water tank connected to the pressure differential static level is placed on the top of the pier. The measuring robot is set up on the forced centering pier on the shore. By setting targets, it measures the displacement of the arch rib, beam bottom and arch foot corresponding to the hanger to be replaced. Three-axis accelerometers are set on the cables of the hanger to be replaced, the adjacent hanger to the hanger to be replaced, and the new hanger to measure the cable tension; among them, if the hanger is the shortest hanger in each arch, the cable tension is measured using a pressure ring.

[0013] The beneficial effects achieved by the present invention are as follows: the present invention automatically collects the monitoring data of the arch bridge during the construction process and the data of vehicles passing through the arch bridge, determines the impact data of the vehicles on the arch bridge through the vehicle data, eliminates the impact data from the arch bridge monitoring data, and obtains clean monitoring data, thereby obtaining the deformation of the arch bridge and the stress state of each component at the current stage, realizing the construction monitoring of the arch bridge hanger replacement when the bridge is open to traffic, and realizing the rapid collection and processing of control data, thereby greatly improving the efficiency of construction monitoring. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a flow chart of the construction monitoring method for the replacement of the hanger rods of an arch bridge in the open-to-traffic state; Figure 2 This is a schematic diagram of the stress of the first-level arch rib under tension; Figure 3 A stress diagram of the newly added steel longitudinal beam for the first stage of tensioning is shown; Figure 4 This is a schematic diagram of the stress of the first-level tensioned beam; Figure 5 This is a schematic diagram of the finite element analysis model of an arch bridge; Figure 6 This is a block diagram of the construction monitoring system for the replacement of the arch bridge suspenders when it is open to traffic; Figure 7 This is a block diagram of the construction monitoring device for the replacement of the arch bridge suspenders when it is open to traffic; Figure 8 Schematic diagram of the collection device layout. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. It is obvious that the embodiments described are only part of the embodiments of the present disclosure, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present disclosure and its application or use. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present disclosure.

[0016] Unless otherwise specified, the relative arrangement of components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present disclosure.

[0017] At the same time, it should be understood that for the convenience of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship.

[0018] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0019] In all examples shown and discussed herein, any specific values should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0020] It should be noted that like symbols and letters refer to like items in the following figures, so once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0021] In order to solve the problems existing in the existing monitoring of boom replacement construction, the present disclosure proposes a method, system and device for monitoring the boom replacement construction of an arch bridge in a traffic-open state.

[0022] The monitoring of the hanger replacement construction mainly monitors the deformation of the arch bridge and the stress state of each component during construction. In order to achieve better monitoring results, the focus is on how to select monitoring data.

[0023] Currently, the replacement of the boom is carried out in stages, such as temporary cable installation, first tensioning of the temporary cable, first unloading of the original boom (i.e. the boom to be replaced), second tensioning of the temporary cable, second unloading of the original boom, third tensioning of the temporary cable, and third unloading of the original boom.

[0024] During the staged replacement, the main changes are: arch rib displacement change, bridge deck displacement change, cable force change and stress change. These changes can be analyzed as follows: By analyzing the displacement data of each stage during the removal of the 14# hanger in the mid-span, it can be seen that after each temporary hoisting system is removed and the original hanger is tensioned, the vertical displacement of the arch rib hanging point returns to zero, as shown in Table 1.

[0025] Table 1 Changes in vertical displacement of the 14# lifting point during the staged demolition of the arch rib by the 14# lifting rod

[0026] By analyzing the displacement data of each stage during the removal of the 14# hanger in the mid-span, it can be seen that after each removal of the temporary hoisting system and tensioning of the original hanger, the vertical displacement of the bridge deck hanging point returns to zero, as shown in Table 2.

[0027] Table 2 Changes in vertical displacement of the 14# lifting point during the staged demolition of the bridge deck by the 14# lifting rod

[0028] By analyzing the displacement data at each stage during the removal of the 10# hanger on one side of the mid-span, it can be seen that the original hanger cable force was gradually removed, and the cable force of the temporary cable gradually increased. The total cable force at the hanging point exceeded the original design cable force value during the tensioning process, but after the hanger was replaced, it remained basically consistent with the original design cable force. See Table 2 for details.

[0029] Table 3 Changes in cable forces of original suspenders, temporary cables and adjacent suspenders during staged tensioning and unloading (kN)

[0030] By analyzing the displacement data of each stage when the 14# boom was removed on one side in the span, it can be seen that there were large differences in the lifting points of the replacement boom during the three tensioning processes, and the difference in cable tension between adjacent booms was greater than 5%. Therefore, during monitoring, it is necessary to focus on the changes in the cable tension of one adjacent boom.

[0031] See Figures 2-4 By analyzing the stress data at each stage of the removal of the 14# hanger in the mid-span, it was found that the stress changes of the arch ribs, steel beams, and newly added steel longitudinal beams were small during the graded removal of the tie rods; among them, when the first-level temporary cables were tensioned, the stress changes were slightly larger, and the maximum stresses of the arch ribs, steel beams, and newly added steel longitudinal beams were 97.2MPa, 62.7MPa, and -17.5MPa, respectively.

[0032] According to theoretical calculations based on bridge simulations, the maximum vertical displacement of the bridge deck during construction, during the installation of additional steel longitudinal beams, was 1.41 mm. After removing a pair of tie rods, the maximum horizontal displacement of the abutment was 0.43 mm. Under the worst-case scenario, where one hanger rod breaks and the temporary hoisting system fails, the maximum vertical displacements of the arch rib and deck are 0.8 mm and -13.89 mm, respectively. The stress reserves of the arch ribs, crossbeams, and newly added steel longitudinal beams all meet requirements. Tie rods, as core components for resisting horizontal thrust, can easily cause horizontal displacement of the abutment at the piers and displacement of the pier tops and pier bodies due to pier settlement during tie rod replacement and removal. Therefore, during construction monitoring, key monitoring measures for this project include arch rib alignment, deck alignment, arch foot displacement (i.e., horizontal displacement, which is the same as the horizontal displacement of the abutment), pier top settlement and pier body displacement, and cable tension. Arch rib alignment primarily monitors arch rib displacement, while deck alignment primarily monitors vertical deck displacement. Furthermore, bridge temperature is a key factor influencing structural deformation, so additional environmental monitoring, namely temperature and humidity, is also recommended. Specific monitoring details are shown in Figure 4.

[0033] Table 4 Monitoring content list

[0034] To ensure structural safety during construction, based on the construction drawing design documents, calculation results of each construction section and relevant specifications, and taking into account the accuracy of monitoring equipment and live load interference under the condition of uninterrupted on-site traffic, the control value of the main arch deflection (i.e., beam bottom displacement) during the construction phase is taken to be less than or equal to 3mm and lasts for 2 minutes; the control value of the arch seat horizontal displacement is taken to be less than or equal to 2mm. On the premise that the specifications are met during the acceptance phase, the design requirements are met.

[0035] According to bridge simulation theory calculations, under the most unfavorable working condition during construction, when one hanger is broken and the temporary hoisting system fails, the cable tension of the adjacent hanger will change dramatically, with a maximum change of 20%. In order to meet the design and specification requirements in the acceptance stage, according to the standard "Highway Engineering Quality Inspection and Assessment Standard", the control value is ±10%, and the extreme value is ≤20%. The monitoring control values at each stage are shown in Table 5 below.

[0036] Table 5 Monitoring control values

[0037] Based on the above analysis, this disclosure discloses an embodiment of a method for monitoring the replacement of arch bridge suspenders in a traffic-open state. Figure 1 , Figure 1 The embodiments can be executed by a cloud platform or a server, etc.

[0038] like Figure 1 As shown, step 1 of the embodiment is to obtain the arch bridge monitoring data and vehicle data passing through the arch bridge in the current stage; wherein the current stage is a sub-stage of the boom replacement construction stage.

[0039] It should be noted that, as shown in Tables 1-5, the existing boom replacement process primarily includes a construction phase and an acceptance phase. The construction phase can be divided into multiple sub-phases: the preparation phase, the boom replacement phase, and the bridge completion phase. The preparation phase primarily involves setting up the construction platform. The boom replacement phase primarily involves installing temporary cables, initially tensioning them, initially unloading the original boom (i.e., the boom to be replaced), second tensioning of the temporary cables, second unloading of the original boom, third tensioning of the temporary cables, and third unloading of the original boom. The bridge completion phase primarily involves dismantling the construction platform. This monitoring method is implemented in each sub-phase to ensure safety during the arch bridge boom replacement process.

[0040] It should be noted that vehicle data mainly includes information such as vehicle model and vehicle load. The vehicle data here is mainly used to distinguish the impact of vehicles on arch bridges, so there is no need to divide them too detailed. For example, vehicles can be divided into two-wheeled vehicles, four-wheeled vehicles, medium-sized vehicles, and large vehicles.

[0041] Currently, AI image recognition technology is relatively mature and accurate, so we can obtain videos of vehicles passing through arch bridges, perform AI image recognition on the videos, and obtain vehicle data.

[0042] It should be noted that, referring to Table 4, the monitoring data of the arch bridge mainly include the vertical displacement of the bridge deck, the displacement of the arch rib, the displacement of the beam bottom, the displacement of the arch foot, the cable tension of the adjacent hangers of the hanger to be replaced, and the cable tension of the hanger to be replaced / new hanger.

[0043] return Figure 1 In step 2 of the embodiment, the impact data of the vehicle on the arch bridge is determined based on the vehicle data and a pre-built impact database.

[0044] It should be noted that the impact data mainly includes vertical displacement, arch rib displacement, beam bottom displacement, arch foot displacement, and cable tension change caused by vehicles passing through the arch bridge. Therefore, in some embodiments, the method of constructing the impact database may include: 21) Obtain arch bridge monitoring data when various types of vehicles pass through the arch bridge.

[0045] Before the boom replacement construction, when the arch bridge is closed, various common vehicles can be arranged to pass through the bridge in turn to collect data such as bridge displacement and cable force corresponding to each type of vehicle.

[0046] 22) Use the arch bridge monitoring data corresponding to the vehicle as the impact data of the vehicle on the arch bridge to build an impact database.

[0047] return Figure 1 , step 3 of the embodiment, removes the influencing data from the arch bridge monitoring data to obtain clean monitoring data.

[0048] During the boom replacement construction, video surveillance AI image recognition + database technology is used, combined with the impact database, and indicators such as the duration of single abnormal data are verified to eliminate the impact of bridge traffic vehicles and ensure the accuracy of monitoring data collected under various working conditions during the boom replacement process.

[0049] return Figure 1 In step 4 of the embodiment, the deformation of the arch bridge and the stress state of each component at the current stage are obtained based on the clean monitoring data.

[0050] It should be noted that, as shown in Table 4, some of the monitoring data in the table are direct monitoring data, such as temperature, humidity, and cable tension. Some data require further processing, such as linearity, which is composed of displacement over a period of time. Therefore, the arch rib linearity of the arch bridge at the current stage can be obtained based on the arch rib displacement, and the bridge deck linearity of the arch bridge at the current stage can be obtained based on the vertical displacement of the bridge deck.

[0051] It should be noted that the stress state of each component can be obtained through the finite element analysis model of the arch bridge. Specifically, the clean monitoring data is input into the pre-built finite element analysis model of the arch bridge to obtain the stress state of each component of the arch bridge at the current stage.

[0052] According to the design standards, component dimensions, and material parameters in the arch bridge as-built drawing, a finite element analysis model of the arch bridge was constructed using finite element analysis software. The main arch ring, crossbeams, and longitudinal beams of the bridge were simulated using beam elements, and the hangers were simulated using truss elements. A total of 1,430 nodes and 2,499 units were established. Figure 5 .

[0053] It should be noted that in addition to collecting and obtaining some data, the most important thing about the monitoring method is to issue an alarm for some abnormal data. Specifically, some clean monitoring data and stress status are compared with the corresponding reference values of the current stage. If the comparison result meets the corresponding preset alarm rules, an alarm will be issued.

[0054] As shown in Table 5, the vertical displacement of the bridge deck, the displacement of the bottom beam, and the cable tension of the suspenders can be compared with the corresponding reference values. For example, if the vertical displacement of the bridge deck during the construction phase exceeds 5mm and lasts for 2 minutes, an alarm will be issued. If the deflection change of the main arch (i.e., the displacement of the bottom beam) during the construction phase exceeds 3mm and lasts for 2 minutes, an alarm will be issued. If the horizontal displacement of the arch seat during the construction phase exceeds 2mm and lasts for 2 minutes, an alarm will be issued. Similar alarm methods are used for the same stress state.

[0055] The above method automatically collects the monitoring data of the arch bridge during the construction process and the data of vehicles passing through the arch bridge, determines the impact data of the vehicles on the arch bridge through the vehicle data, eliminates the impact data from the arch bridge monitoring data, and obtains clean monitoring data, thereby obtaining the deformation of the arch bridge and the stress state of each component at the current stage, realizing the construction monitoring of the arch bridge hanger replacement under the traffic state, and realizing the rapid collection and processing of control data, greatly improving the efficiency of construction monitoring.

[0056] See also Figure 6 , which is a schematic diagram of an embodiment of the construction monitoring system for replacing the suspender rods of an arch bridge in the state of opening to traffic, Figure 6 An embodiment of the invention is a virtual system that can be loaded and executed by a cloud platform or a server, etc., and includes an acquisition module, an impact data determination module, a removal module and a situation status determination module.

[0057] The acquisition module of the embodiment is configured to acquire the arch bridge monitoring data and the vehicle data passing through the arch bridge in the current stage; wherein the current stage is a sub-stage of the boom replacement construction stage.

[0058] The impact data determination module of the embodiment is configured to determine the impact data of the vehicle on the arch bridge based on the vehicle data and a pre-built impact database.

[0059] The elimination module of the embodiment is configured to eliminate influencing data from the arch bridge monitoring data to obtain clean monitoring data.

[0060] The condition state determination module of the embodiment is configured to obtain the deformation condition of the arch bridge and the stress state of each component at the current stage based on the clean monitoring data.

[0061] Similar to the method, the system automatically collects the monitoring data of the arch bridge during the construction process and the data of vehicles passing through the arch bridge, determines the impact data of the vehicle on the arch bridge through the vehicle data, eliminates the impact data from the arch bridge monitoring data, and obtains clean monitoring data, thereby obtaining the deformation of the arch bridge and the stress state of each component at the current stage, realizing the construction monitoring of the arch bridge hanger replacement under the traffic state, and realizing the rapid collection and processing of control data, greatly improving the efficiency of construction monitoring.

[0062] See also Figure 7 , which is a schematic diagram of an embodiment of the construction monitoring device for replacing arch bridge hangers in the open-to-traffic state disclosed herein, including a vehicle data acquisition device, an arch bridge monitoring data acquisition device, a cloud platform, and an interactive terminal connected to the cloud platform. The cloud platform uses the above method to perform construction monitoring, and the interactive terminal displays the data and results of the construction monitoring process.

[0063] See Figure 8 In an embodiment, the vehicle data acquisition device may be a camera 6 arranged outside the arch bridge and with a camera range capable of covering the entire bridge deck, so as to collect information such as the vehicle type and vehicle load of vehicles passing within the bridge range, and upload the collected video to the cloud platform, which performs vehicle identification through AI image recognition technology.

[0064] See Figure 8 In the embodiment, the arch bridge monitoring data acquisition device mainly includes a pressure differential static level 4, a measuring robot 3, a three-axis accelerometer 5, a pressure ring 2, a temperature and humidity sensor 7, etc.

[0065] The pressure differential static level 4 is installed on the bridge deck at the horizontal position corresponding to the boom. The water tank connected to the pressure differential static level 4 is arranged on the top of the pier. The reference point in the pressure differential static level 4 is the reference point of the vertical position of the bridge deck. The pressure differential static level 4 is used to measure the vertical displacement of the bridge deck and transmit the monitoring data to the cloud platform in real time.

[0066] On both sides of the river bank, select places with good visibility to set up forced centering piers, and install measuring robots 3 on the forced centering piers. Measuring robots 3 measure the displacement of the arch ribs, beam bottoms, and arch feet corresponding to the suspenders to be replaced by setting targets 1. Specifically, before the suspender replacement construction, targets 1 are set at the pier position and the arch rib side, beam bottom, and arch foot of the suspender to be constructed, and the measuring robots 3 are operated to learn the position information and measurement path of each measuring point to complete the initial value collection before replacement; during the suspender replacement construction process, the measuring robots 3 measure the displacement of the arch ribs, beam bottom, and single-point displacement of the arch foot in turn according to the originally set sampling frequency. After the replacement of a single suspender is completed, the target 1 measuring point is moved to the next suspender replacement working surface, and the above steps are repeated.

[0067] Triaxial accelerometers 5 are deployed on the boom to be replaced, its adjacent boom, and the new boom after replacement to test boom cable tension. Real-time monitoring of cable tension is performed to measure cable tension changes before, during, and after construction. These changes are compared with the actual pre-replacement cable tension. Deviations in cable tension are controlled to meet design and regulatory acceptance requirements. For short boom cable tensions that cannot be accurately measured using the frequency method, pressure rings 2 are installed on the shortest boom of each arch to facilitate cable tension measurement during construction and operation.

[0068] It should be noted that in order to monitor parameter requirements on the cloud platform, a large background database can be established to store the data collected during construction. Through the data interface settings, the displacement and cable tension data collected on site can be entered into the finite element analysis model of the bridge to achieve real-time evaluation of the bridge structure status.

[0069] It should be noted that the interactive end can be a computer, which is mainly used to display the data and results of the construction monitoring process. For example, the interactive interface can be divided into seven modules, which respectively display the finite element analysis model of the bridge, real-time video of the construction site, the overall bridge deck line shape, changes in the vertical displacement measurement points of the arch ribs, changes in the vertical displacement measurement points of the bridge deck, changes in ambient temperature and humidity, and changes in the hanger cable tension measurement points.

[0070] The above device realizes the construction monitoring of the arch bridge hanger replacement when the bridge is open to traffic, and realizes the rapid collection and processing of control data, greatly improving the efficiency of construction monitoring.

[0071] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for monitoring the replacement of arch bridge suspenders in an open-to-traffic state, characterized in that: include: Obtaining the arch bridge monitoring data and vehicle data passing through the arch bridge during the current phase; wherein the current phase is a sub-phase of the boom replacement construction phase; Determine the impact data of vehicles on arch bridges based on vehicle data and a pre-built impact database; Eliminate impact data from arch bridge monitoring data to obtain clean monitoring data; Based on the clean monitoring data, the deformation of the arch bridge and the stress state of each component at the current stage are obtained.

2. The method for monitoring the replacement of arch bridge suspenders in the state of opening to traffic according to claim 1 is characterized in that: Methods for building impact databases include: Obtain arch bridge monitoring data when various types of vehicles pass through the arch bridge; The arch bridge monitoring data corresponding to the vehicle is used as the impact data of the vehicle on the arch bridge to build an impact database.

3. The method for monitoring the replacement of arch bridge suspenders in the state of opening to traffic according to claim 1 is characterized in that: The method further comprises the step of issuing an alarm, the step comprising: Part of the clean monitoring data and the stress state are compared with the corresponding reference values of the current stage. If the comparison result meets the corresponding preset alarm rules, an alarm is issued.

4. The method for monitoring the replacement of arch bridge suspenders in the state of opening to traffic according to claim 3 is characterized in that: The monitoring data of arch bridges include the vertical displacement of the bridge deck, the displacement of the arch ribs, the displacement of the bottom of the beam, the displacement of the arch foot, the cable tension of the adjacent hangers of the hanger to be replaced, and the cable tension of the hanger to be replaced / new hanger; among them, the vertical displacement of the bridge deck, the displacement of the bottom of the beam and the cable tension of the hanger are compared with the corresponding reference values.

5. The method for monitoring the replacement of arch bridge suspenders in the state of opening to traffic according to claim 4 is characterized in that: Based on the clean monitoring data, the deformation of the arch bridge and the stress state of each component at the current stage are obtained, including: According to the arch rib displacement, the arch rib linearity of the arch bridge at the current stage is obtained; According to the vertical displacement of the bridge deck, the deck linearity of the arch bridge at the current stage is obtained; The clean monitoring data is input into the pre-built finite element analysis model of the arch bridge to obtain the stress state of each component of the arch bridge at the current stage.

6. A construction monitoring system for replacing the suspender rods of an arch bridge in a traffic-open state, characterized in that: include: An acquisition module acquires the arch bridge monitoring data and vehicle data passing through the arch bridge at the current stage; wherein the current stage is a sub-stage of the boom replacement construction stage; An impact data determination module determines the impact data of vehicles on the arch bridge based on vehicle data and a pre-built impact database; Elimination module, which removes influencing data from the arch bridge monitoring data to obtain clean monitoring data; The situation status determination module obtains the deformation status of the arch bridge and the stress status of each component at the current stage based on the clean monitoring data.

7. A monitoring device for replacing the suspender rods of an arch bridge in a traffic-open state, characterized in that: The invention comprises a vehicle data acquisition device, an arch bridge monitoring data acquisition device, a cloud platform and an interactive terminal connected to the cloud platform. The cloud platform adopts the method described in any one of claims 1 to 5 to perform construction monitoring, and the interactive terminal displays the data and results during the construction monitoring process.

8. The monitoring device for replacing the suspender rods of an arch bridge in the state of traffic according to claim 7 is characterized in that: The vehicle data acquisition device is a camera arranged outside the arch bridge and whose camera range can cover the entire bridge deck.

9. The monitoring device for replacing the arch bridge suspender rods in the state of traffic according to claim 7 is characterized in that: The data acquisition device for arch bridge monitoring includes a pressure differential static level, a measuring robot, a three-axis accelerometer, and a pressure ring; A pressure differential static level is installed on the bridge deck to measure the vertical displacement of the bridge deck. The water tank connected to the pressure differential static level is placed on the top of the pier. The measuring robot is set up on the forced centering pier on the shore. By setting targets, it measures the displacement of the arch rib, beam bottom and arch foot corresponding to the hanger to be replaced. Three-axis accelerometers are set on the cables of the hanger to be replaced, the adjacent hanger to the hanger to be replaced, and the new hanger to measure the cable tension; among them, if the hanger is the shortest hanger in each arch, the cable tension is measured using a pressure ring.

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