Linear dynamic monitoring system for construction of external expansion main tower of suspension bridge

Abstract

The invention provides a linear dynamic monitoring system for construction of an external expansion main tower of a suspension bridge, and the system comprises a data collection device which is used for obtaining target data of the external expansion main tower in the construction process; the data processing module is used for analyzing the target data of the external expansion main tower to obtain the actual deformation quantity of the current construction stage; the suspension bridge external expansion main tower simulation module is used for reversely deducing a preset suspension bridge finished bridge model meeting the safety standard according to the current construction step, determining the simulation deformation quantity of an external expansion main tower in the current construction stage, and inputting material data of the previous construction step before the preset suspension bridge finished bridge model enters the current construction step; updating according to the material data; the main tower state monitoring module is used for acquiring the actual deformation quantity and the simulated deformation quantity and determining the linear change of the deformation quantity of the main tower along with the construction progress in the construction process; and the main tower construction parameter adjusting module is used for determining main tower construction adjusting parameters. The main tower deformation quantity determined by the system better meets engineering requirements, and over-evaluation is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge construction monitoring and control, and in particular relates to a dynamic monitoring system for the construction line of an outward-expanded main tower of a suspension bridge. Background Art

[0002] Suspension bridges are one of the most common types of bridges. They are mainly composed of cables suspended from the main tower and anchored on both sides as the main load-bearing components of the superstructure. The superstructure construction stage is the critical period for the linear control of the suspension bridge structure, which requires a large amount of construction measurement and monitoring measurement.

[0003] The main towers of suspension bridges come in a variety of shapes, such as H-shaped, A-shaped, etc. In actual applications, the main towers of suspension bridges also adopt an outward expansion shape, that is, the upper crossbeam of the main tower is wider than the lower crossbeam. This type of main tower can meet the needs of building bridges in certain special terrains because its bottom occupies a small area. Due to the special structure of the outward expansion main tower, it is more likely to deform under the tension of the main cable. The main cable, the main load-bearing structure of the suspension bridge, is a flexible structure, and the main cable is supported by the main tower. The top of the upper crossbeam of the outward expansion main tower suspension bridge mainly bears the horizontal force transmitted by the main cable. Under the influence of the tension, the main tower may inevitably deform, and the deformation of the main tower will affect the distribution and balance of the main cable tension, and thus affect the stability of the entire suspension bridge.

[0004] In the related art, displacement sensors or radar sensors are used to track the deformation of the main tower during the construction process. The basis for measuring the deformation is the initial shape of the bridge. The measurement of the deformation is not combined with the actual construction situation, resulting in an over-evaluation of the deformation of the suspension bridge, which increases the difficulty of construction or maintenance costs. Summary of the invention

[0005] In view of this, the purpose of the present invention is to provide a suspension bridge outward expansion main tower construction line dynamic monitoring system to meet the needs of evaluating the main tower deformation according to the actual construction situation and reducing the construction difficulty and maintenance cost.

[0006] In order to achieve the above object, the present invention provides the following technical solutions: The invention provides a suspension bridge outward expansion main tower construction linear dynamic monitoring system, comprising: a data acquisition device, arranged at a target position of the suspension bridge outward expansion main tower, and used for obtaining target data of the outward expansion main tower during the construction process; a data processing module, used for analyzing the target data of the outward expansion main tower, and obtaining the actual deformation amount of the outward expansion main tower in the current construction stage; a suspension bridge outward expansion main tower simulation module, used for reversely deducing a preset suspension bridge completion model that meets safety standards according to the current construction step, and determining the simulated deformation amount of the outward expansion main tower in the current construction stage, and the preset suspension bridge completion model inputs the material data of the previous construction step before entering the current construction step, and is updated according to the material data; a main tower state monitoring module, used for obtaining the actual deformation amount and the simulated deformation amount of each construction stage, and determining the linear change of the main tower deformation amount during the construction process with the construction progress; a main tower construction parameter adjustment module, used for determining the main tower construction adjustment parameters according to the linear change of the main tower deformation amount during the construction process with the construction progress.

[0007] Optionally, the data acquisition equipment includes: an unmanned aerial vehicle image acquisition equipment, used to obtain the image of the upper beam of the outward expansion main tower of the suspension bridge above the outward expansion main tower, the upper beam of the outward expansion main tower is preset with a main tower center display mark; a high-precision total station measurement system, used to calculate the three-dimensional spatial position coordinates of the suspension bridge at the target angle after meteorological correction; a data processing module, including: an image processing module, used to correct the nonlinear distortion of the image of the upper beam of the outward expansion main tower of the suspension bridge, and align the corrected image according to the three-dimensional spatial position coordinates of the suspension bridge at the target angle, so as to obtain the actual position coordinates of the center display mark on the upper beam of the outward expansion main tower of the suspension bridge.

[0008] Optionally, the main tower status monitoring module includes: a main tower center display mark offset determination module, which is used to determine the center display mark offset according to the center display mark position coordinates in the simulated deformation variable and the actual position coordinates of the center display mark on the upper crossbeam of the outward-expanded main tower of the suspension bridge; a main tower displacement determination module, which is used to determine the main tower displacement according to the three-dimensional space position coordinates of the suspension bridge calculated by the high-precision total station measurement system and the three-dimensional space position coordinates corresponding to the original design model of the suspension bridge; a first main tower deformation variable determination module, which is used to determine the deformation parameters of the first main tower according to the center display mark offset and the main tower displacement.

[0009] Optionally, the suspension bridge includes multiple outward-expanding main towers, and for any two adjacent outward-expanding main towers, it also includes: multiple ranging sensors, including a first ranging sensor, a second ranging sensor, a third ranging sensor, and a fourth ranging sensor, the first ranging sensor being arranged on one side of the upper crossbeam top of the first outward-expanding main tower, the second ranging sensor being arranged on one side of the upper crossbeam top of the second outward-expanding main tower, the third ranging sensor and the fourth ranging sensor being arranged on opposite sides of the lower crossbeam tops of the first outward-expanding main tower and the second outward-expanding main tower, respectively; the first ranging sensor acquires the distance from one side of the upper crossbeam top of the first outward-expanding main tower to the other side of the upper crossbeam top of the first outward-expanding main tower as the first distance; the second ranging sensor acquires the distance from one side of the upper crossbeam top of the second outward-expanding main tower to a distance from one side of the top of the lower beam of the first outward-expanding main tower to the two sides of the top of the upper beam of the second outward-expanding main tower as the third distance and the fourth distance; a fourth distance sensor obtains the distance from the other side of the top of the lower beam of the second outward-expanding main tower to the two sides of the top of the upper beam of the first outward-expanding main tower as the fifth distance and the sixth distance; a first fitting module is used to fit the first triangle with the first distance, the fifth distance and the sixth distance; a second fitting module is used to fit the second triangle with the second distance, the third distance and the fourth distance; a second main tower deformation amount determination module is used to quantify the difference between the first triangle and the second triangle to obtain the deformation parameters of the second main tower.

[0010] Optionally, a system for dynamically monitoring the construction line of an outward-expanded main tower of a suspension bridge further includes: a displacement influence simulation module, which is used to adjust the parameters of a pre-established outward-expanded main tower model of the suspension bridge according to the displacement of the main tower, and to construct a first simulation triangle and a second simulation triangle in the adjusted outward-expanded main tower model of the suspension bridge; a displacement influence degree measurement module, which is used to quantify the difference between the first simulation triangle and the second simulation triangle to obtain the displacement influence degree; and a second main tower deformation parameter correction module, which is used to correct the deformation parameters of the second main tower based on the displacement influence degree.

[0011] Optionally, a system for dynamically monitoring the construction line shape of an outward-expanded main tower of a suspension bridge, the data acquisition equipment includes: a construction picture acquisition equipment, used to acquire construction pictures; a main tower status monitoring module, including: a fusion module, used to fuse the deformation parameters of the first main tower and the corrected deformation parameters of the second main tower to obtain comprehensive deformation parameters; a construction progress determination module, used to determine the current construction progress based on the acquired construction pictures; a linear relationship display module, used to match the comprehensive deformation parameters with the construction progress, and construct and display a linear change graph of the main tower deformation amount during the construction process with the construction progress.

[0012] Optionally, the main tower construction parameter adjustment module includes: a construction parameter determination module for receiving key control factors selected by a user and construction parameters corresponding to the key control factors; a construction parameter simulation module for adjusting the suspension bridge model according to the construction parameters and inputting the construction parameters of the next construction step. When the shape variable of the main tower of the suspension bridge model is less than a preset threshold, the construction parameters determined by the construction parameter determination module are used as the main tower construction adjustment parameters.

[0013] The present embodiment proposes a system for dynamically monitoring the construction line shape of an outward-expanded main tower of a suspension bridge. In a simulation module of an outward-expanded main tower of a suspension bridge, a preset suspension bridge completion model is updated by the material data of the previous construction step, and the preset suspension bridge completion model that meets the safety standards is reversed. During the construction process, the suspension bridge completion model in the initial state is continuously brought closer to the actual construction process. That is to say, the measurement basis of the main tower deformation variable in each construction stage is the actual deformation variable and the bridge completion model updated based on the construction materials of the previous construction stage. The measurement of its deformation variable is more in line with the actual construction situation. In addition, in the present system, only the influence of the actual construction material data on the deformation is considered. This part is a relatively unavoidable influence. By subtracting the actual deformation variable of the current construction stage from the simulated deformation variable, the deformation variable caused by the easily avoidable factors can be obtained. This part of the deformation variable is more valuable for reference. Compared with using the initial shape of the bridge as the deformation measurement factor, the main tower deformation variable determined by the present invention is more in line with engineering requirements and avoids excessive evaluation.

[0014] Other advantages, objectives and features of the present invention will be described in the following description and will be apparent to those skilled in the art to some extent, or those skilled in the art may be taught from the practice of the present invention. The objectives and other advantages of the present invention may be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to make the purpose, technical solution and beneficial effects of the present invention clearer, the present invention provides the following drawings for illustration: Figure 1 A schematic diagram of a system for dynamically monitoring the construction line of a suspension bridge outward expansion main tower in the present invention; Figure 2 This is a schematic diagram of the outward-expanded main tower structure of a suspension bridge according to the present invention; Figure 3 A schematic diagram of a system for dynamically monitoring the construction line of a suspension bridge outward expansion main tower in the present invention; Figure 4 It is a schematic diagram of the layout of multiple distance measuring sensors in the present invention. DETAILED DESCRIPTION

[0016] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, it can also be the internal connection of two components, it can be a wireless connection, or it can be a wired connection. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0018] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0019] This embodiment proposes a suspension bridge expansion main tower construction line dynamic monitoring system, such as Figure 1 As shown, including: The data acquisition device 101 is arranged at the target position of the outward expansion main tower of the suspension bridge and is used to obtain the target data of the outward expansion main tower during the construction process; The data processing module 102 is used to analyze the target data of the external expansion main tower to obtain the actual deformation of the external expansion main tower at the current construction stage; The suspension bridge outward expansion main tower simulation module 103 is used to reverse the preset suspension bridge model that meets the safety standards according to the current construction step, determine the simulated deformation of the outward expansion main tower at the current construction stage, and input the material data of the previous construction step before entering the current construction step of the preset suspension bridge model, and update it according to the material data; The main tower state monitoring module 104 is used to obtain the actual deformation and simulated deformation at each construction stage, and determine the linear change of the main tower deformation during the construction process with the construction progress; The main tower construction parameter adjustment module 105 is used to determine the main tower construction adjustment parameters according to the linear change of the main tower shape variable with the construction progress during the construction process.

[0020] For example, the system proposed in this embodiment specifically monitors the extended main tower of the suspension bridge, such as Figure 2As shown in the figure, the whole is V-shaped, including an upper beam and a lower beam, and the upper beam is wider than the lower beam. In order to ensure the smooth turning of the main cable and decompose the tension in the main cable into vertical force and unbalanced horizontal force, and evenly transmit them to the tower top or the anchor bracket, the connection between the top of the upper beam and the two arms of the main tower is the slope change point, and a steel saddle cover is installed above the slope change point, that is, the slope of the two arms is unified, and the slope at the installation of the steel saddle cover is slightly increased.

[0021] In this embodiment, the type of data acquisition equipment is set according to the type of main tower shape variable to be monitored. For example, when the main tower shape variable to be monitored is the main tower shape variable, the sensor installed at each target position of the main tower is a radar sensor. The radar sensor periodically sends radar signals and receives echo signals. The data acquisition equipment collects data once at a certain interval (for example, 10ms).

[0022] After the data acquisition device 101 acquires the target data, in order to ensure the accuracy and availability of the data, it will be transmitted to the data processing module 102 through the communication module. The data processing module 102 can be a computer system. In the computer system, the acquired analog signal is first pre-processed, such as filtering and signal conditioning, and then digitally converted. Then, the acquired data is analyzed and processed according to the data processing software to obtain the actual deformation of the main tower. Specifically, the acquired target data can be a radar echo signal.

[0023] In the suspension bridge outward expansion main tower simulation module 103, the preset suspension bridge completed model is established in the software according to the design drawings of the suspension bridge in the initial state, and the analysis software can be Midas Civil. In each construction stage, it will be updated according to the material data of the previous construction stage, that is, the suspension bridge completed model in the initial state is constantly brought close to the actual construction process during the construction process. It should be noted that after each material data is updated for the preset suspension bridge completed model, it is necessary to verify whether the updated completed model meets the safety standards. If it meets the safety standards, it is reversed to obtain the simulated deformation of the outward expansion main tower in the current construction stage. If it does not meet the standards, the geometric parameters of the suspension bridge are adjusted until it meets the safety standards. The reverse process specifically includes dividing the reverse disassembly analysis construction conditions of the model, starting from the completed bridge state, gradually tracing back to the current construction stage, and recording the deformation of the suspension bridge main tower in the current construction state as the simulated deformation. It should be noted that in this embodiment, the connection method between the main cable and the main tower of the completed bridge model always maintains the original designed position and angle. By inputting the material data of the construction steps into the completed bridge model, the influence of construction materials on the deformation of the main tower of the suspension bridge under ideal conditions can be effectively simulated, and the deformation caused by other factors such as the main cable connection force can be screened out.

[0024] Specifically, before entering the current construction step, it is necessary to first collect and input the material data of the previous construction step, such as the amount of concrete used in other parts of the bridge, the type and quantity of steel used in the main tower structure, and the physical properties of the construction materials, such as the strength and elastic modulus of the materials. According to the material data, the parameters in the model, such as the stiffness and strength of the materials, are adjusted to reflect the actual construction conditions. According to the mechanical properties of the suspension bridge, a mathematical model is established, including the mechanical equations of the main cable, suspender and main tower. The model is solved by finite element analysis to obtain the simulated deformation of the main tower at the current construction stage.

[0025] The main tower status monitoring module 104 integrates the data obtained from the data acquisition device 101 and the deformation parameters provided by the simulation module 103 to analyze the deformation of the main tower. Specifically, the deformation of the main tower in the current construction stage can be obtained by subtracting them.

[0026] The main tower construction parameter adjustment module 105 adjusts the construction parameters, such as construction speed, material usage, etc., according to the linear change data of the deformation variable to ensure that the deformation of the main tower is controlled within a safe range. As a feasible method, the method of determining the main tower construction adjustment parameters can be to use the root cause analysis method to determine the key factors that cause the deformation, and adjust and simulate the parameters of the key factors until a model that meets the safety standards is obtained, and then the corresponding key factors that meet the safety standards are used as construction adjustment parameters. This embodiment does not limit the method for determining the main tower construction adjustment parameters, and those skilled in the art can determine it as needed.

[0027] The present embodiment proposes a system for dynamically monitoring the construction line shape of an outward-expanded main tower of a suspension bridge. In a simulation module of an outward-expanded main tower of a suspension bridge, a preset suspension bridge completion model is updated by the material data of the previous construction step, and the preset suspension bridge completion model that meets the safety standards is reversed. During the construction process, the suspension bridge completion model in the initial state is continuously brought closer to the actual construction process. That is to say, the measurement basis of the main tower deformation variable in each construction stage is the actual deformation variable and the bridge completion model updated based on the construction materials of the previous construction stage. The measurement of its deformation variable is more in line with the actual construction situation. In addition, in the present system, only the influence of the actual construction material data on the deformation is considered. This part is a relatively unavoidable influence. By subtracting the actual deformation variable of the current construction stage from the simulated deformation variable, the deformation variable caused by the easily avoidable factors can be obtained. This part of the deformation variable is more valuable for reference. Compared with using the initial shape of the bridge as the deformation measurement factor, the main tower deformation variable determined by the present invention is more in line with engineering requirements and avoids excessive evaluation.

[0028] As an optional implementation, a suspension bridge outward expansion main tower construction line dynamic monitoring system, such as Figure 3 As shown, the data acquisition device 101 includes: The drone image acquisition device 1011 is used to obtain the image of the upper cross beam of the outer expansion main tower of the suspension bridge above the outer expansion main tower, and the upper cross beam of the outer expansion main tower is preset with the main tower center display mark; A high-precision total station measurement system 1012 is used to calculate the three-dimensional spatial position coordinates of the suspension bridge at the target angle after meteorological correction; The data processing module 102 includes: The image processing module 1021 is used to correct the nonlinear distortion of the image of the cross beam on the outward-extended main tower of the suspension bridge, and to align the corrected image according to the three-dimensional spatial position coordinates at the target angle of the suspension bridge to obtain the actual position coordinates of the center display mark on the cross beam on the outward-extended main tower of the suspension bridge.

[0029] For example, in this embodiment, a main tower center display mark is pre-set at the center position above the main tower of the suspension bridge, and the display mark can be a special symbol or a special material to facilitate observation. The drone image acquisition device 1011 is a drone carrying an image acquisition device. The drone image acquisition device 1011 flies above the main tower of the suspension bridge to obtain the upper beam image of the main tower of the suspension bridge.

[0030] The high-precision total station measurement system 1012 may include a high-precision total station, a prism, and a temperature, humidity, and air pressure sensor. Meteorological data is obtained through the temperature, humidity, and air pressure sensors, and the data measured by the total station is corrected according to the meteorological data. The specific correction method may be to measure dry temperature, wet temperature, air pressure, and other meteorological elements at the total station and the prism, respectively, and then take the average value of the two places and substitute it into the formula to calculate the meteorological correction, thereby realizing the correction of the measurement data. In this embodiment, the target angle may be any angle that can capture any complete side of the main tower of the suspension bridge, and this embodiment is not limited to this.

[0031] In the image processing module 1021, first, the image of the cross beam on the extended main tower of the suspension bridge needs to be corrected for nonlinear distortion. Specifically, it can be a geometric correction technology in image processing, or a convolutional neural network (CNN) can be used to directly learn the transformation parameters or nonlinear mapping between images. Therefore, a registration network based on supervised learning, such as VoxelMorph, can be used to train a large number of image pairs before and after registration to learn the nonlinear transformation between images.

[0032] The corrected image needs to rely on point cloud registration technology to register according to the three-dimensional spatial position coordinates at the target angle of the suspension bridge, and align the three-dimensional point cloud data from different perspectives into a unified coordinate system. Specifically, feature-based registration methods such as FPFH (Fast Point Feature Histogram) and SHOT (Signature of Histograms of OrienTations) can be used to extract feature points and their descriptors from point cloud data, and then estimate the transformation between the two point clouds by matching these feature points. After completing the nonlinear distortion correction of the image and the three-dimensional spatial position coordinate registration, the actual position coordinates of the center display mark on the upper beam of the extended main tower of the suspension bridge can be obtained.

[0033] The main tower status monitoring module 104, such as Figure 3 As shown, including: The main tower center display mark offset determination module 1041 is used to determine the center display mark offset according to the center display mark position coordinates in the simulated deformation amount and the actual position coordinates of the center display mark on the upper crossbeam of the main tower of the suspension bridge; The main tower displacement determination module 1042 is used to determine the main tower displacement according to the three-dimensional spatial position coordinates of the suspension bridge calculated by the high-precision total station measurement system and the three-dimensional spatial position coordinates corresponding to the original design model of the suspension bridge; The first main tower deformation amount determining module 1043 is used to determine the deformation parameters of the first main tower according to the center display mark offset and the main tower displacement.

[0034] Exemplarily, when the simulated deformation of the outward expansion main tower in the current construction stage in the outward expansion main tower simulation module 103 is characterized by the position coordinates of the center display mark on the upper cross beam of the outward expansion main tower, the center display mark offset determined by the main tower center display mark offset determination module 1041 is the absolute value of the difference between the center display mark position coordinates in the simulated deformation and the actual position coordinates of the center display mark on the upper cross beam of the outward expansion main tower of the suspension bridge. It should be noted that the center display mark position coordinates in the simulated deformation are obtained by reverse deduction of the preset suspension bridge model updated by inputting the material data of the previous construction step, and the determination of the center display mark position coordinates only considers the influence of the construction materials on the deformation of the suspension bridge main tower under ideal conditions. Then, the center display mark offset is the difference between the actual position coordinates of the center display mark and the simulated position coordinates of the center display mark after only considering the influence of the construction materials on the deformation of the suspension bridge main tower, that is, the cause of the offset is the deformation of the main tower caused by other factors other than the construction materials and the offset caused by the displacement of the main tower.

[0035] The main tower displacement determination module 1042 determines the displacement of the main tower of the suspension bridge based on the difference between the three-dimensional spatial position coordinates of the suspension bridge calculated by the high-precision total station measurement system and the three-dimensional spatial position coordinates corresponding to the original design model of the suspension bridge. Specifically, the high-precision total station measurement system is used to obtain the current actual three-dimensional spatial position coordinates of the suspension bridge, and the three-dimensional spatial position coordinates of the suspension bridge measured by the total station are compared with the three-dimensional spatial position coordinates in the original design model of the suspension bridge. Through comparative analysis, the difference between the actual position and the design position of the main tower is calculated, that is, the displacement of the main tower, including displacement in the horizontal and vertical directions.

[0036] The first main tower deformation determination module 1043 determines the deformation parameter of the first main tower according to the center display mark offset and the main tower displacement. The specific method may be to take the absolute value of the difference between the center display mark offset and the main tower displacement as the first main tower deformation parameter. The first main tower deformation parameter can indicate the deformation degree of the main tower. When the deformation degree exceeds the preset value, a prompt alarm can be issued.

[0037] The present embodiment proposes a system for dynamically monitoring the construction line of an outwardly expanded main tower of a suspension bridge, which determines the offset of the main tower center display mark by displaying the actual position coordinates of the main tower center and the center display mark position coordinates in the simulated deformation variable, and after determining the offset, corrects the offset by the main tower displacement determined by the main tower displacement determination module, thereby obtaining a more accurate first main tower deformation parameter that can indicate the degree of deformation of the main tower, thereby improving the accuracy of main tower deformation detection.

[0038] As an optional implementation, the suspension bridge includes a plurality of outward-expanded main towers, and for any two adjacent outward-expanded main towers, the suspension bridge further includes: A plurality of distance measuring sensors, including a first distance measuring sensor, a second distance measuring sensor, a third distance measuring sensor, and a fourth distance measuring sensor, wherein the first distance measuring sensor is arranged on one side of the upper beam top of the first outward-expanding main tower, the second distance measuring sensor is arranged on one side of the upper beam top of the second outward-expanding main tower, and the third distance measuring sensor and the fourth distance measuring sensor are arranged on opposite sides of the lower beam tops of the first outward-expanding main tower and the second outward-expanding main tower respectively; the first distance measuring sensor obtains the distance from one side of the upper beam top of the first outward-expanding main tower to the other side of the upper beam top of the first outward-expanding main tower as the first distance; the second distance measuring sensor obtains the distance from one side of the upper beam top of the second outward-expanding main tower to the other side of the upper beam top of the second outward-expanding main tower , as the second distance; the third ranging sensor obtains the distance from one side of the top of the lower beam of the first outward-expanded main tower to both sides of the top of the upper beam of the second outward-expanded main tower, as the third distance and the fourth distance; the fourth ranging sensor obtains the distance from the other side of the top of the lower beam of the second outward-expanded main tower to both sides of the top of the upper beam of the first outward-expanded main tower, as the fifth distance and the sixth distance; the first fitting module is used to fit the first triangle with the first distance, the fifth distance and the sixth distance; the second fitting module is used to fit the second triangle with the second distance, the third distance and the fourth distance; the second main tower deformation amount determination module is used to quantify the difference between the first triangle and the second triangle to obtain the deformation parameters of the second main tower.

[0039] For example, when the suspension bridge is not a single-tower suspension bridge but a double-tower suspension bridge or a multi-tower suspension bridge, four sensors may be respectively arranged on the top of the upper beam and the top of the lower beam of the adjacent main towers between two adjacent main towers. Figure 4 As shown, it is a schematic diagram of the first distance, the fifth distance and the sixth distance obtained by the first ranging sensor and the fourth ranging sensor. The first fitting module fits a unique first triangle according to the first distance, the fifth distance and the sixth distance. Similarly, the second distance, the third distance and the fourth distance are obtained by the second ranging sensor and the third ranging sensor, and the second fitting module can fit a unique second triangle according to the second distance, the third distance and the fourth distance. In the initial state, the first triangle and the second triangle formed between the two main towers of the suspension bridge should have a similarity of 100%. When the main tower is deformed, the similarity between the first triangle and the second triangle will gradually decrease. Therefore, the similarity between the first triangle and the second triangle, or the difference quantification result of the first triangle and the second triangle can be used as an indicator for quantifying the deformation or displacement of the suspension bridge, and the difference quantification result is used as the deformation parameter of the second main tower. By monitoring the deformation parameter of the second main tower, the linear change of the deformation amount with the construction progress can be displayed. The difference quantization result of the first triangle and the second triangle can be obtained by first taking the angles or side lengths of the two triangles as elements to generate a side length set or an angle set, and then calculating the Euclidean distance between the side length sets or angle sets of the two triangles as the difference quantization result.

[0040] This embodiment proposes a system for dynamically monitoring the construction line of an outward-expanded main tower of a suspension bridge. By utilizing the characteristics of the outward-expanded main tower, ranging sensors are arranged at different positions to form two shapes with 100% similarity under standard conditions. The difference between the two shapes is monitored, which can more intuitively and effectively show the changes in the main tower deformation with the construction progress. In addition, the method is simple in layout and requires less computing resources.

[0041] As an optional implementation, the suspension bridge outward expansion main tower construction line dynamic monitoring system also includes: A displacement impact simulation module is used to adjust the parameters of a pre-established suspension bridge outward expansion main tower model according to the main tower displacement, and to construct a first simulation triangle and a second simulation triangle in the adjusted suspension bridge outward expansion main tower model; A displacement influence degree measurement module is used to quantify the difference between the first simulated triangle and the second simulated triangle to obtain a displacement influence degree; The second main tower deformation parameter correction module is used to correct the second main tower deformation parameter based on the displacement influence.

[0042] Exemplarily, in the previous embodiment, the quantification result of the difference between the first triangle and the second triangle also includes the influence of the displacement of the outward-expanded main tower on the triangle difference. Therefore, in this embodiment, a displacement influence degree measurement module is used to determine the displacement influence degree, and the deformation parameters of the second main tower are corrected with reference to the displacement influence degree.

[0043] The displacement impact simulation module is responsible for adjusting the parameters of the pre-established suspension bridge outward expansion main tower model according to the measured main tower displacement data or the main tower displacement determined in the main tower displacement determination module 1042. Through the adjustment, the influence of the main tower displacement on the entire suspension bridge structure can be simulated. The actual displacement data of the main tower is used to adjust the relevant parameters in the suspension bridge model, such as the position, angle or other key structural parameters of the tower. After the adjustment, the first simulation triangle and the second simulation triangle are constructed. The displacement impact measurement module is used to quantify the difference between the first simulation triangle and the second simulation triangle to evaluate the actual influence of the main tower displacement on the suspension bridge structure and obtain the displacement influence. The second main tower deformation parameter correction module adjusts the second main tower deformation parameters according to the displacement influence. Specifically, the second main tower deformation parameters can be subtracted from the displacement influence, thereby obtaining the main tower deformation parameters without displacement influence.

[0044] This embodiment proposes a dynamic monitoring system for the construction line shape of an outward-expanded main tower of a suspension bridge, which corrects the deformation of the main tower indicated by the shape difference, eliminates the influence of the main tower displacement on the shape, and improves the accuracy of deformation monitoring.

[0045] As an optional implementation, the data acquisition device includes: Construction picture acquisition equipment, used to acquire construction pictures; Main tower condition monitoring module, including: A fusion module is used to fuse the deformation parameters of the first main tower and the corrected deformation parameters of the second main tower to obtain comprehensive deformation parameters; The construction progress determination module is used to determine the current construction progress based on the collected construction pictures; The linear relationship display module is used to match the comprehensive deformation parameters with the construction progress, and to construct and display the linear change diagram of the main tower deformation during the construction process as the construction progresses.

[0046] For example, the construction picture acquisition device acquires real-time pictures of the construction site, and the construction picture acquisition device can be a camera or use a drone or other equipment to acquire real-time pictures at the construction site. The acquired pictures are transmitted to the monitoring center for storage and analysis.

[0047] The fusion module fuses the deformation parameters of the first main tower and the corrected deformation parameters of the second main tower to obtain comprehensive deformation parameters. The data fusion method can be to use data fusion technology (such as weighted average, Kalman filtering, etc.) to fuse the two sets of data to obtain comprehensive deformation parameters. The construction progress determination module determines the current construction progress based on the collected construction pictures. Specifically, the construction pictures are analyzed to identify key indicators of the construction progress (such as material usage, completed construction parts, etc.). The linear relationship display module matches the comprehensive deformation parameters with the construction progress, constructs and displays the linear change diagram of the main tower deformation variable during the construction process with the construction progress. Specifically, a data analysis tool (such as Excel, Python, etc.) is used to construct a relationship model between the deformation variable and the construction progress, and a linear change diagram is drawn.

[0048] This embodiment proposes a dynamic monitoring system for the construction line of the outward expansion main tower of a suspension bridge. By collecting images through construction image collection equipment, the current construction progress can be independently judged, and the deformation parameters of the first main tower and the corrected deformation parameters of the second main tower are fused, which increases the reference dimension of the deformation parameters, improves the accuracy of deformation monitoring, and improves the intelligence of the system.

[0049] As an optional implementation, the main tower construction parameter adjustment module includes: A construction parameter determination module, used to receive key control factors selected by a user and construction parameters corresponding to the key control factors; The construction parameter simulation module is used to adjust the suspension bridge model according to the construction parameters and input the construction parameters of the next construction step. When the shape variable of the main tower of the suspension bridge model is less than the preset threshold, the construction parameters determined by the construction parameter determination module are used as the main tower construction adjustment parameters.

[0050] Exemplarily, the construction parameter determination module can be a touch screen or a computer connected to an input device. The key control factor selection module can be displayed in a primary window in the touch screen to receive the user's key factor selection. The key factor selection can be the factor that can correct the bridge construction parameters obtained by the user analyzing the linear change graph of the main tower shape variable with the construction progress. After selecting the key control factor, the display screen will jump to the secondary window for adjusting the parameters of the key control factor, that is, the construction parameter.

[0051] The construction parameter simulation module determines whether the received construction parameters meet the deformation safety requirements. The specific method can be to adjust the suspension bridge model according to the construction parameters and input the construction parameters of the next construction step. When the deformation of the main tower of the suspension bridge model is less than the preset threshold, the construction parameters determined by the construction parameter determination module are used as the main tower construction adjustment parameters. The preset threshold can be set according to different design requirements, and this embodiment does not limit it.

[0052] The present embodiment proposes a system for dynamically monitoring the construction line shape of an outward-extended main tower of a suspension bridge. The system is provided with a construction parameter determination module, which can adjust the construction parameters according to user needs. The system is also provided with a construction parameter simulation module, which can simulate the construction parameters input by the user to verify their rationality, and provide users with an effective verification window, so that users can efficiently solve deformation problems.

[0053] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. A dynamic monitoring system for the construction line of the main tower of a suspension bridge, characterized in that: include: Data acquisition equipment is deployed at the target location of the external expansion main tower of the suspension bridge to obtain target data of the external expansion main tower during the construction process; A data processing module is used to analyze the target data of the external expansion main tower and obtain the actual deformation of the external expansion main tower at the current construction stage; The suspension bridge outward expansion main tower simulation module is used to reverse the preset suspension bridge model that meets the safety standards according to the current construction step, determine the simulated deformation of the outward expansion main tower at the current construction stage, and input the material data of the previous construction step before entering the current construction step of the preset suspension bridge model, and update it according to the material data; The main tower status monitoring module is used to obtain the actual deformation and simulated deformation at each construction stage, and determine the linear change of the main tower deformation during the construction process with the construction progress; The main tower construction parameter adjustment module is used to determine the main tower construction adjustment parameters according to the linear change of the main tower shape variable with the construction progress during the construction process.

2. A suspension bridge outward expansion main tower construction line dynamic monitoring system according to claim 1, characterized in that: Data collection equipment, including: The drone image acquisition device is used to obtain the image of the upper crossbeam of the outer expansion main tower of the suspension bridge above the outer expansion main tower. The upper crossbeam of the outer expansion main tower is preset with the main tower center display mark; High-precision total station measurement system, used to calculate the three-dimensional spatial position coordinates of the suspension bridge at the target angle after meteorological correction; Data processing module, including: The image processing module is used to correct the nonlinear distortion of the image of the cross beam on the outward expansion main tower of the suspension bridge, and to align the corrected image according to the three-dimensional spatial position coordinates at the target angle of the suspension bridge to obtain the actual position coordinates of the center display mark on the cross beam on the outward expansion main tower of the suspension bridge.

3. A suspension bridge outward expansion main tower construction line dynamic monitoring system according to claim 2, characterized in that: Main tower condition monitoring module, including: The main tower center display mark offset determination module is used to determine the center display mark offset according to the center display mark position coordinates in the simulated deformation amount and the actual position coordinates of the center display mark on the upper crossbeam of the main tower of the suspension bridge; The main tower displacement determination module is used to determine the main tower displacement according to the three-dimensional spatial position coordinates of the suspension bridge calculated by the high-precision total station measurement system and the three-dimensional spatial position coordinates corresponding to the original design model of the suspension bridge; The first main tower deformation amount determination module is used to determine the first main tower deformation parameters according to the center display mark offset and the main tower displacement.

4. A suspension bridge outward expansion main tower construction line dynamic monitoring system according to claim 3, characterized in that: The suspension bridge includes a plurality of outward-expanded main towers, and for any two adjacent outward-expanded main towers, further includes: A plurality of ranging sensors, including a first ranging sensor, a second ranging sensor, a third ranging sensor, and a fourth ranging sensor, wherein the first ranging sensor is arranged on one side of the upper crossbeam top of the first outward-expanded main tower, the second ranging sensor is arranged on one side of the upper crossbeam top of the second outward-expanded main tower, and the third ranging sensor and the fourth ranging sensor are arranged on opposite sides of the lower crossbeam tops of the first outward-expanded main tower and the second outward-expanded main tower respectively; The first distance measuring sensor acquires the distance from one side of the top of the upper crossbeam of the first outward-expanded main tower to the other side of the top of the upper crossbeam of the first outward-expanded main tower as the first distance; The second distance measuring sensor obtains the distance from one side of the top of the upper crossbeam of the second outward-expanded main tower to the other side of the top of the upper crossbeam of the second outward-expanded main tower as the second distance; The third distance measuring sensor obtains the distance from one side of the top of the lower beam of the first outward-expanded main tower to both sides of the top of the upper beam of the second outward-expanded main tower as the third distance and the fourth distance; The fourth distance measuring sensor obtains the distance from the other side of the top of the lower crossbeam of the second outward-expanded main tower to the two sides of the top of the upper crossbeam of the first outward-expanded main tower as the fifth distance and the sixth distance; A first fitting module, used for fitting a first triangle with a first distance, a fifth distance and a sixth distance; A second fitting module, used for fitting a second triangle with a second distance, a third distance and a fourth distance; The second main tower deformation amount determination module is used to quantify the difference between the first triangle and the second triangle to obtain the deformation parameters of the second main tower.

5. A suspension bridge outward expansion main tower construction line dynamic monitoring system according to claim 4, characterized in that: Also includes: A displacement impact simulation module is used to adjust the parameters of a pre-established suspension bridge outward expansion main tower model according to the main tower displacement, and to construct a first simulation triangle and a second simulation triangle in the adjusted suspension bridge outward expansion main tower model; A displacement influence degree measurement module is used to quantify the difference between the first simulated triangle and the second simulated triangle to obtain a displacement influence degree; The second main tower deformation parameter correction module is used to correct the second main tower deformation parameter based on the displacement influence.

6. A suspension bridge outward expansion main tower construction line dynamic monitoring system according to claim 5, characterized in that: Data acquisition equipment includes: Construction picture acquisition equipment, used to acquire construction pictures; Main tower condition monitoring module, including: A fusion module is used to fuse the deformation parameters of the first main tower and the corrected deformation parameters of the second main tower to obtain comprehensive deformation parameters; The construction progress determination module is used to determine the current construction progress based on the collected construction pictures; The linear relationship display module is used to match the comprehensive deformation parameters with the construction progress, and to construct and display the linear change diagram of the main tower deformation during the construction process as the construction progresses.

7. A suspension bridge outward expansion main tower construction line dynamic monitoring system according to any one of claims 1-6, characterized in that: The main tower construction parameter adjustment module includes: A construction parameter determination module, used to receive key control factors selected by a user and construction parameters corresponding to the key control factors; The construction parameter simulation module is used to adjust the suspension bridge model according to the construction parameters corresponding to the key control factors and input the construction parameters of the next construction step. When the shape variable of the main tower of the suspension bridge model is less than the preset threshold, the construction parameters determined by the construction parameter determination module are used as the main tower construction adjustment parameters.

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