System and method for monitoring construction line shape of continuous steel structure bridge

Abstract

The invention relates to the field of structural engineering, in particular to a system and method for monitoring the construction line shape of a continuous steel structure bridge. Comprising a foundation settlement detection module, a foundation settlement analysis module, a beam body linear detection module, a beam body linear analysis module, a concrete pouring amount analysis module, a temperature deformation detection module, a bridge structure analysis module, a bridge construction linear risk analysis module and a management database. The system analyzes the settlement problem of the bridge pier foundation according to the foundation settlement parameters of the bridge pier, analyzes the linear deformation condition of the bridge according to the linear influence parameters of the bridge body, and judges whether the concrete pouring amount needs to be adjusted or not; the bridge construction linear risk condition is analyzed by combining the foundation settlement evaluation coefficient of the bridge, the temperature deformation degree of the bridge body and the safety degree of the bridge structure, whether the bridge construction linear risk condition is qualified or not is judged, feedback is conducted to the system, and various factors influencing the bridge construction linear can be comprehensively considered.

Description

Technical Field

[0001] The present invention relates to the field of structural engineering, and more specifically, to a system and method for monitoring the construction alignment of continuous rigid frame bridges. Background Art

[0002] In the construction of modern transportation infrastructure, continuous rigid frame bridges occupy an important position due to their unique advantages. With the development of the economy and the increasing frequency of regional exchanges, the requirements for the spanning capacity, structural performance, and construction efficiency of bridges are constantly increasing. Continuous rigid frame bridges are widely used in spanning projects in complex terrains such as rivers and canyons due to their good integrity, strong spanning ability, and high driving comfort.

[0003] However, the construction of continuous rigid frame bridges is a complex and delicate process, facing many challenges. Among them, alignment control is a key factor to ensure the structural performance and appearance quality of the bridge. During the construction process, the alignment of the bridge is affected by various factors, such as the application of prestress, temperature changes, etc. These factors interact with each other, making the change of the alignment complex and uncertain. If the alignment cannot be effectively monitored and controlled during the construction process, it may lead to a large deviation between the bridge alignment and the design requirements, thereby affecting the mechanical performance, service life, and driving safety of the bridge.

[0004] For example, the existing Chinese patent with the application number 202310048433.3 discloses a bridge construction alignment control system based on cloud computing. This solution screens and processes the data generated by various data collection devices at the construction site, and displays the current real-time progress of the bridge, the information of the designed bridge's completed state, and the comparison information between the alignment in the designed ideal state and the current alignment based on a web-based dashboard, overcoming the problems of low efficiency, low accuracy, and non-intuitive results in traditional construction monitoring for bridge alignment monitoring.

[0005] However, the following problems exist in the above patent: First, the bridge is affected by various dynamic loads during the construction process, such as vehicle loads, wind loads, vibration loads of construction equipment, etc. This solution does not consider the influence of these loads, which may lead to inaccurate prediction of alignment changes.

[0006] Second, in the continuous rigid frame bridge construction alignment monitoring system, based on the physical principles and actual requirements of bridge construction, the alignment deformation situation can be directly related to the concrete pouring volume. This solution does not involve converting the alignment deformation situation into an adjustment decision for the concrete pouring volume, which may lead to the inability to make decisions in a timely manner, thus affecting the construction progress of the entire continuous rigid frame bridge. Summary of the Invention

[0007] To overcome the disadvantages in the background art, the embodiments of the present invention provide a system and a monitoring method for monitoring the construction alignment of continuous rigid frame bridges, which can effectively solve the problems involved in the above-mentioned background art.

[0008] The object of the present invention can be achieved by the following technical solutions: The present invention provides a system for monitoring the construction alignment of continuous rigid frame bridges, including: a foundation settlement detection module, which is used to detect the foundation settlement parameters of bridge piers, and the foundation settlement parameters include the elevation fluctuation degree and verticality deviation of the foundation.

[0009] A foundation settlement analysis module, which is used to analyze the settlement problems of the bridge pier foundation according to the foundation settlement parameters of the bridge pier.

[0010] A beam alignment detection module, which is used to detect the alignment influence parameters of the beam, and the alignment influence parameters include the relative displacement of the cantilever end, the relative displacement of each control point, and the elevation difference at both ends.

[0011] A beam alignment analysis module, which is used to analyze the alignment deformation of the bridge according to the alignment influence parameters of the beam.

[0012] A concrete pouring volume analysis module, which is used to judge whether it is necessary to adjust the concrete pouring volume according to the alignment deformation of the bridge and give feedback.

[0013] A temperature deformation detection module, which is used to collect the temperature of each part of the bridge beam at each temperature time point and calculate the temperature deformation degree of the beam.

[0014] A bridge structure analysis module, which is used to estimate the construction loads that may be generated in each construction process during the bridge construction, collect the stress of each detection point of the bridge structure under the corresponding construction loads in each construction process in real time, and calculate the safety degree of the bridge structure.

[0015] A bridge construction alignment risk analysis module, which is used to analyze the bridge construction alignment risk situation, judge whether the bridge construction alignment risk situation is qualified, and give feedback to the system.

[0016] A management database, which is used to store the allowable stress range of the rigid frame bridge.

[0017] Preferably, the present invention provides a monitoring method for monitoring the construction alignment of continuous rigid frame bridges. The specific steps of the monitoring method are as follows: S1. Foundation settlement detection: Detect the foundation settlement parameters of the bridge pier, and the foundation settlement parameters include the elevation fluctuation degree and verticality deviation of the foundation.

[0018] S2. Foundation settlement analysis: Analyze the settlement problems of the bridge pier foundation according to the foundation settlement parameters of the bridge pier.

[0019] S3. Beam linearity detection: Detect the linearity influence parameters of the beam. The linearity influence parameters include the relative displacement of the cantilever end, the relative displacements of each control point, and the elevation difference between the two ends.

[0020] S4. Beam linearity analysis: Analyze the linear deformation of the bridge according to the linearity influence parameters of the beam.

[0021] S5. Concrete pouring volume analysis: Judge whether it is necessary to adjust the concrete pouring volume according to the linear deformation of the bridge and give feedback.

[0022] S6. Temperature deformation detection: Collect the temperatures of each part of the bridge beam at each temperature time point and calculate the temperature deformation degree of the beam.

[0023] S7. Bridge structure analysis: Estimate the construction loads that may be generated in each construction process during the bridge construction, collect the stresses of each detection point on the bridge structure under the corresponding construction loads of each construction process in real time, and calculate the safety degree of the bridge structure.

[0024] S8. Bridge construction linearity risk analysis: Analyze the bridge construction linearity risk situation, judge whether the bridge construction linearity risk situation is qualified, and give feedback.

[0025] Compared with the prior art, the embodiments of the present invention have at least the following advantages or beneficial effects: First, this system analyzes the settlement problem of the pier foundation according to the elevation fluctuation degree and verticality deviation of the pier foundation. The elevation fluctuation degree directly reflects the position change of the pier foundation in the vertical direction, and the verticality deviation can reflect whether the pier is perpendicular to the design axis during the construction process, which can more comprehensively reflect the overall settlement situation of the pier foundation.

[0026] Second, this system analyzes the linear deformation of the bridge according to the relative displacement of the cantilever end of the beam, the relative displacements of each control point, and the elevation difference between the two ends, and judges whether it is necessary to adjust the concrete pouring volume. The relative displacement of the cantilever end of the beam can reflect the deformation trend of the beam during the cantilever construction process, the relative displacements of each control point can describe the overall deformation of the beam from multiple key positions, and the elevation difference between the two ends can intuitively reflect the linear change of the beam in the longitudinal direction. Through comprehensive analysis, the linear deformation of the bridge can be accurately grasped.

[0027] III. This system combines the foundation settlement evaluation coefficient of the bridge, the degree of temperature deformation of the beam body, and the safety degree of the bridge structure to analyze the risk situation of the bridge construction alignment, determine whether the risk situation of the bridge construction alignment is qualified, and provide feedback to the system. The foundation settlement evaluation coefficient of the bridge reflects the influence degree of the pier foundation settlement on the bridge alignment. The degree of temperature deformation of the beam body is an important environmental factor affecting the beam body alignment. Temperature changes will cause the beam body to expand or contract, thereby changing the alignment. The safety degree of the bridge structure takes into account the stress of the bridge structure under different loads. By comprehensively considering these three data, the risk situation of the bridge construction alignment can be comprehensively evaluated. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0029] Figure 1 It is a module connection diagram of a system for monitoring the construction alignment of a continuous rigid frame bridge.

[0030] Figure 2 It is Figure 1 the flowchart of the foundation settlement detection module in

[0031] Figure 3 It is a flowchart of a monitoring method for monitoring the construction alignment of a continuous rigid frame bridge. DETAILED IMPLEMENTATION MANNER

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0033] Please refer to Figure 1 as shown, a system for monitoring the construction alignment of a continuous rigid frame bridge, the system includes a foundation settlement detection module, a foundation settlement analysis module, a beam body alignment detection module, a beam body alignment analysis module, a concrete pouring volume analysis module, a temperature deformation detection module, a bridge structure analysis module, a bridge construction alignment risk analysis module, and a management database.

[0034] The management database is connected to the foundation settlement analysis module, the beam alignment analysis module, the concrete pouring volume analysis module, the temperature deformation detection module, the bridge structure analysis module, and the bridge construction alignment risk analysis module. The foundation settlement analysis module is connected to the concrete pouring volume analysis module and the foundation settlement detection module. The beam alignment detection module is connected to the beam alignment analysis module. The bridge construction alignment risk analysis module is connected to the foundation settlement analysis module, the temperature deformation detection module, and the bridge structure analysis module.

[0035] The foundation settlement detection module is used to detect the foundation settlement parameters of the bridge pier. The foundation settlement parameters include the elevation fluctuation degree and the verticality deviation of the foundation.

[0036] Please refer to Figure 2 As shown, the specific operation method of the foundation settlement detection module is as follows: A1. Select a number of observation points beside the bridge pier foundation at a set spacing, denoted as each observation point. At the same time, select each time point at a fixed time interval. Use a level to measure the elevation of each observation point of the foundation at each time point. Calculate the average elevation of each observation point of the foundation by averaging the elevations of each observation point of the foundation at each time point. Obtain the elevation fluctuation degree of the bridge pier foundation, denoted as α, by comparing the elevation of each observation point of the foundation at each time point with the average elevation of each observation point of the foundation. By selecting observation points beside the bridge pier foundation at a set spacing and measuring at time points with a fixed time interval, the foundation elevation can be monitored comprehensively and systematically.

[0037] It should be noted that the specific analysis method for the elevation fluctuation degree of the bridge pier foundation is as follows: Read the elevation of each observation point of the foundation and the average elevation of each observation point of the foundation at each time point, denoted as H im 、 i represents the number of the i-th time point, i = 1, 2,..., n, and m represents the number of the m-th observation point, m = 1, 2,..., q. Substitute them into the formula to obtain the elevation fluctuation degree α of the bridge pier foundation. n represents the number of time points, and q represents the number of observation points. This helps to promptly detect whether there are problems such as uneven settlement in the bridge pier foundation. If the elevation fluctuation degree exceeds the normal range, it may indicate that the foundation structure is affected by external factors (such as soil settlement, water flow scouring, etc.), which is crucial for ensuring the overall safety of the bridge.

[0038] For each observation point, calculate to obtain the deviation value of each observation point relative to the average elevation. If this difference is positive, it means that the elevation of this observation point is higher than the average elevation; if it is negative, it is lower than the average elevation. Calculate Obtain the relative deviation ratio, standardize the deviation value to associate it with the average elevation, which is convenient for comparison between bases of different scales (bases with different average elevations). Calculate the mean of the relative deviation ratios of all observation points, which reflects the average relative deviation of each observation point of the entire base relative to the average elevation, and obtain a value that can comprehensively reflect the elevation fluctuation degree of the pier foundation.

[0039] A2. Select the center points at the top and bottom of the pier. For each pier, import the center points at the top and bottom of the pier into the set two-dimensional position coordinate system to obtain the plane coordinates of the top and bottom of each pier. Calculate the vertical distance between the plane coordinates of the top and bottom of each pier, and obtain the verticality deviation of the pier through mean calculation, denoted as β; the verticality deviation reflects whether the pier meets the design requirements in the vertical direction and is an important index for evaluating the structural form of the pier.

[0040] The foundation settlement analysis module is used to analyze the settlement problem of the pier foundation according to the foundation settlement parameters of the pier.

[0041] The specific operation method of the foundation settlement analysis module is as follows: Calculate the foundation settlement evaluation coefficient of the bridge according to the elevation fluctuation degree of the pier foundation and the verticality deviation of the pier. α 0 、β 0 represent the preset elevation fluctuation degree of the pier foundation and the verticality deviation threshold of the pier, φ 1 、φ 2 represent the preset weight factors of the elevation fluctuation degree of the pier foundation and the verticality deviation of the pier; the foundation settlement evaluation coefficient can provide a quantitative basis for judging whether the bridge structure is in a safe state. If the coefficient exceeds the normal range, it may mean that there is a large settlement risk in the bridge foundation, and it is necessary to conduct inspections and treatments in a timely manner.

[0042] The foundation settlement evaluation coefficient of the bridge involves two influencing parameters, namely the elevation fluctuation degree of the pier foundation and the verticality deviation of the pier. The elevation fluctuation degree of the pier foundation is a preset standard value used as a boundary for measuring the state of the pier foundation. When the elevation fluctuation degree of the pier foundation is small, the value will be larger, indicating that when the elevation fluctuation is small, the foundation is relatively better in this regard. On the contrary, if the elevation fluctuation degree is large, this part of the value will be small. It represents the deviation of the pier verticality deviation relative to the set threshold. If the pier verticality deviation is exactly equal to the deviation threshold, the value of this part approaches infinity. When the difference between the pier verticality deviation and the deviation threshold is larger (whether greater than or less than), the value of this part is smaller. Multiply these two parts by the corresponding weights and add them to obtain the bridge foundation settlement evaluation coefficient, comprehensively considering the two factors that have important impacts on the bridge foundation settlement: the elevation fluctuation of the pier foundation and the pier verticality deviation.

[0043] It should be noted that in a specific implementation, φ 1 can be set to 0.6, and φ 2 can be set to 0.4. The elevation fluctuation of the pier foundation directly reflects the dynamic change of the foundation settlement. The foundation settlement is mainly manifested as the change of elevation. If the elevation fluctuation is large, it indicates that the foundation may be in an unstable state and may be affected by various factors such as uneven settlement of the foundation soil and change of the groundwater level. This kind of fluctuation will have a significant impact on the overall structural stability of the bridge because it changes the initial support height of the pier, and then affects the stress state of the superstructure of the bridge, which may lead to problems such as additional stress and deformation of the beam body; although the pier verticality deviation is not an index directly reflecting the foundation settlement, it is closely related to the foundation settlement. Uneven foundation settlement may cause the pier to have a verticality deviation. Once the verticality deviation is too large, it will cause uneven stress on the pier, generate eccentric loads, increase the stress concentration at the local part of the pier, and at the same time, it will also affect the overall alignment of the bridge. Therefore, the weight corresponding to the degree of elevation fluctuation of the pier foundation is higher.

[0044] The beam alignment detection module is used to detect the alignment influence parameters of the beam. The alignment influence parameters include the relative displacement of the cantilever end, the relative displacement of each control point, and the elevation difference at both ends.

[0045] The specific operation method of the beam alignment detection module is as follows: B1. Set each construction time point during the cantilever construction of the beam according to the preset equal time interval principle, import the positions of the cantilever end at each construction time point into the set two-dimensional position coordinate system, and take the first construction time point as the initial time point, thereby obtaining the initial position coordinates of the beam cantilever end and the position coordinates of each construction time point. Calculate the relative displacement of the beam cantilever end, denoted as d; by determining the coordinates of the cantilever end position in the two-dimensional coordinate system at the preset equal time interval, the dynamic change of the cantilever end position can be accurately captured in time series, and the change of the cantilever end position can be converted into measurable data for quantitative analysis.

[0046] It should be noted that the specific analysis method for the relative displacement of the cantilever end of the beam body is as follows: Read the initial position coordinates of the cantilever end of the beam body and the position coordinates at each construction time point. Respectively, obtain the displacement components of the initial position coordinates of the cantilever end of the beam body and the position coordinates at each construction time point in the x - direction and y - direction by taking the difference. By accumulating the squared results of these two and performing the arithmetic square root operation, the relative displacement of the cantilever end of the beam body is obtained, denoted as d. During cantilever construction, the displacement situation of the cantilever end of the beam body directly reflects the construction accuracy and stability. By monitoring the relative displacement, it is possible to timely detect whether there are abnormal deformations during the construction process, thereby ensuring the construction quality and ensuring that the cantilever structure is constructed according to the design requirements.

[0047] B2. Pre - set a number of equally - spaced measurement control points at both ends of the bridge beam body, denoted as each control point. Import the control points at both ends of the bridge beam body into the set three - dimensional position coordinate system to obtain the initial three - dimensional coordinates of each control point of the beam body. Setting equally - spaced measurement control points at both ends of the beam body and obtaining their initial three - dimensional coordinates is equivalent to establishing an initial spatial position reference system on the beam body, providing basic data for accurately evaluating the deformation of the beam body during construction. By comparing with the initial three - dimensional coordinates, the deformation situation of the beam body in each direction can be accurately analyzed, which is very important for ensuring that the alignment of the beam body meets the design requirements.

[0048] B3. According to the method of obtaining the initial three - dimensional coordinates of each control point of the beam body, obtain the three - dimensional coordinates of each control point of the beam body again before the closure section construction, denoted as the three - dimensional coordinates of each control point of the beam body. Calculate the relative displacement of each control point of the beam body through the coordinate difference, denoted as d'. f ; By obtaining the three - dimensional coordinates of the beam body control points again and calculating the difference with the initial coordinates to obtain the relative displacement, it can accurately reflect the spatial position change situation of the beam body at this construction stage.

[0049] It should be noted that the specific analysis method for the relative displacement of each control point of the beam body is as follows: Read the initial three - dimensional coordinates of each control point of the beam body and the three - dimensional coordinates of each control point of the beam body, denoted as (x” f , y” f , z” f ) and (x' f , y' f , z' f ). Through the calculation formula obtain the relative displacement d' of each control point of the beam body f ; By monitoring the relative displacement of the beam body control points, it is possible to timely detect whether there are abnormal deformations in the beam body, such as uneven settlement or lateral deviation, etc., thereby taking measures to ensure the safety of the beam body structure and ensuring the stability of the overall bridge structure.

[0050] The calculation formula for the relative displacement of each control point of the beam body is based on the distance formula between two points in a three-dimensional rectangular coordinate system. The initial three-dimensional coordinates of each control point of the beam body and the displacement components of each control point of the beam body in the x-direction, y-direction, and z-direction are calculated respectively, and then the relative displacement of the cantilever end of the beam body is obtained comprehensively.

[0051] B4. Use a level to measure the readings of the leveling rods at both ends of the beam body in turn to obtain the elevations at both ends of the beam body, and calculate the elevation difference between the two ends of the beam body by calculating the difference, denoted as h; the elevation difference is an intuitive manifestation of the vertical deformation of the beam body. By measurement, it can be understood whether there is uneven settlement of the beam body or whether the vertical alignment changes during the construction process.

[0052] The beam alignment analysis module is used to analyze the alignment deformation of the bridge according to the alignment influence parameters of the beam body.

[0053] The specific operation method of the beam alignment analysis module is as follows: Read the relative displacement d of the cantilever end of the beam body, the relative displacement d' of each control point of the beam body f and the elevation difference h between the two ends of the beam body, and calculate the alignment deformation evaluation coefficient of the bridge: where d 0 d' 0 h 0 respectively represent the thresholds of the relative displacement of the cantilever end of the preset beam body, the relative displacement of the beam control point, and the elevation difference between the two ends of the beam body. respectively represent the weight factors of the relative displacement of the cantilever end of the beam body, the relative displacement of the beam control point, and the elevation difference between the two ends of the beam body. k represents the number of control points; it can comprehensively consider the deformation conditions of the beam body in different parts (cantilever end, control point) and different directions (horizontal, vertical), so as to comprehensively evaluate the alignment deformation of the beam body.

[0054] The alignment deformation evaluation coefficient of the bridge involves three influence parameters: the relative displacement of the cantilever end of the beam body, the relative displacement of each control point of the beam body, and the elevation difference between the two ends of the beam body. All of them are negatively correlated with the alignment deformation evaluation coefficient of the bridge. When there is a relative displacement at the cantilever end of the beam body, this means that the structural form of the beam body has changed. If the relative displacement at the cantilever end is larger, then the alignment deformation of the bridge is more serious, resulting in a decrease in the alignment deformation evaluation coefficient of the bridge; the relative displacement of each control point of the beam body also reflects the overall alignment change of the beam body. Each control point has its ideal position. When there is a relative displacement between these control points, the alignment of the bridge no longer meets the design requirements. The larger the relative displacement, the smaller the alignment deformation evaluation coefficient of the bridge; the elevation difference between the two ends of the beam body is an important indicator to measure whether the alignment of the bridge is smooth. If the elevation difference between the two ends of the beam body is too large, it means that the bridge has a large alignment deformation, which will seriously affect the normal use and safety of the bridge.

[0055] It should be noted that, in a specific implementation, Can be set to 0.4, It can be set to 0.3. It can be set to 0.3. The relative displacement of the cantilever end of the beam is a key factor reflecting the linear deformation of the beam. For the beam of the cantilever structure, the cantilever end is a part of the structure that is more sensitive to stress and deformation. The relative displacement of the cantilever end directly affects the overall linear direction of the beam. The beam control point is a key monitoring point set to accurately control the linear shape of the beam. The relative displacement of these control points directly reflects the situation of the beam being formed according to the design requirements. If the control point is relatively displaced, it means that the linear shape of the beam at the key part is deformed, which may affect the overall stress performance and aesthetics of the beam. The elevation difference at both ends of the beam has a direct impact on the linear shape of the bridge. The linear shape of the bridge requires a certain smoothness in the longitudinal direction. If the elevation difference at both ends of the beam is too large, this smoothness will be destroyed, resulting in bumps and increased impact force when the vehicle is driving, affecting driving comfort and the service life of the bridge. Therefore, the weight corresponding to the relative displacement of the cantilever end of the beam is slightly higher, and the weights corresponding to the relative displacement of the beam control point and the elevation difference at both ends of the beam are second.

[0056] The concrete pouring volume analysis module is used to determine whether the concrete pouring volume needs to be adjusted according to the linear deformation of the bridge and provide feedback.

[0057] The specific operation method of the concrete pouring quantity analysis module is as follows: comparing the linear deformation evaluation coefficient of the bridge with a preset threshold value of the linear deformation evaluation coefficient of the bridge; if the linear deformation evaluation coefficient of the bridge is greater than or equal to the preset threshold value of the linear deformation evaluation coefficient of the bridge, it indicates that the bridge linear shape is qualified and no adjustment of the concrete quantity is required; if the linear deformation evaluation coefficient of the bridge is less than the preset threshold value of the linear deformation evaluation coefficient of the bridge, it indicates that the bridge linear shape is unqualified and the concrete quantity needs to be adjusted, and the bridge linear shape is fed back to the system; when the linear shape is unqualified, the bridge linear shape is fed back to the system, so that the system can obtain the actual status information of the beam linear shape in time, provide data support for subsequent adjustment measures (such as concrete quantity adjustment), and also help to monitor and record the entire bridge construction or maintenance process.

[0058] The temperature deformation detection module is used to collect the temperature of each part of the bridge beam at each temperature time point and calculate the degree of temperature deformation of the beam.

[0059] The specific operation method of the temperature deformation detection module is as follows: C1. Temperature sensors are arranged at various parts of the beam body according to the bridge structure, including the mid-span, support, top center and bottom center of the beam body; the temperature information of different positions of the beam body can be fully obtained, which helps to accurately grasp the temperature field distribution of the entire beam body.

[0060] C2. Set each temperature time point according to the preset equal time interval principle. Collect the temperatures of each part of the bridge beam at each temperature time point through temperature sensors. Take the temperature time point as the abscissa and the temperature as the ordinate to construct a two-dimensional coordinate system. Then, mark several points in the constructed two-dimensional coordinate system for the temperatures corresponding to each temperature time point to form the temperature time point - temperature curve of each part of the bridge beam; present the change of temperature over time with an intuitive two-dimensional coordinate system, convert the discrete temperature measurement data into a continuous curve, and make the temperature change trend clear at a glance.

[0061] C3. Calculate the slope of the temperatures corresponding to adjacent temperature time points in the temperature time point - temperature curve of each part of the bridge beam, and obtain the sum of the temperature slopes of each part of the bridge beam, that is, the temperature change rate of each part of the bridge beam, denoted as V p , where p represents the serial number of the p-th part of the bridge beam, p = 1, 2,..., l; the parts with a faster temperature change rate may have a greater impact on the deformation of the beam, which helps to determine the key monitoring and maintenance parts.

[0062] C4. Calculate the temperature deformation degree of the beam according to the temperature change rate of each part of the bridge beam where l represents the number of parts of the bridge beam; establish a direct connection between temperature change and beam deformation, and reflect the influence degree of temperature on the structural performance of the beam (such as linear shape, stress distribution, etc.).

[0063] By subtracting the average value from the temperature change rate of each part, the deviation degree of each part relative to the average temperature change rate can be obtained. A positive difference indicates that the temperature change rate of this part is higher than the average value, and a negative difference indicates that it is lower than the average value. Divide the difference by the average value to get a ratio. This ratio represents the relative degree of deviation of each part from the average temperature change rate. It makes the temperature change rates of different magnitudes comparable in a relative sense. Finally, accumulate the relative deviation degrees of all parts, and the obtained value comprehensively reflects the overall deviation of the temperature change rates of each part of the beam relative to the average level.

[0064] Bridge structure analysis module, used to estimate the construction loads that may occur in each construction process during bridge construction, collect the stresses of each detection point of the bridge structure under the corresponding construction loads of each construction process in real time, and calculate the safety degree of the bridge structure.

[0065] The specific operation method of the bridge structure analysis module is as follows: D1. Classify the construction loads, which are divided into static loads and dynamic loads. The static loads include the self-weight of construction equipment and the self-weight of the cast concrete, and the dynamic loads include the impact force during the hoisting and lowering process of the crane and the concrete vibration force. Thus, estimate the construction loads that may be generated in each construction process during the bridge construction.

[0066] D2. Set each detection point in the bridge structure according to the preset principle. During the bridge construction process, as each construction process progresses, collect the stress of each detection point in the bridge structure under the corresponding construction loads of each construction process in real time, obtain the stress of each detection point in the bridge structure under each construction load, compare it with the allowable stress range of the steel structure bridge stored in the management database, calculate the safety degree of the bridge structure, denoted as l; it is possible to conduct a safety assessment for each construction process because the loads and stress distributions of different construction processes are different, so that potential safety hazards in each process can be discovered in a timely manner.

[0067] It should be noted that the specific analysis method of the safety degree of the bridge structure is as follows: Read the stress of each detection point in the bridge structure under each construction load, calculate the stress of the bridge structure under each construction load through mean value calculation, read the allowable stress range of the steel structure bridge, put the stress of the bridge structure under each construction load into it for comparison. If the stress of the bridge structure under a certain construction load is within the allowable stress range of the steel structure bridge, record the safety degree of the bridge structure corresponding to the construction process of this construction load as 1, otherwise record it as 0. Thus, obtain the safety degree of the bridge structure for each construction process, and calculate the mean value to obtain the safety degree of the bridge structure; it helps to ensure the bridge construction quality because the assessment of the safety degree can reflect whether the actual stress state of the structure during the construction process meets the design requirements, so as to effectively monitor the construction quality.

[0068] The bridge construction alignment risk analysis module is used to analyze the bridge construction alignment risk situation, judge whether the bridge construction alignment risk situation is qualified, and give feedback to the system.

[0069] The specific operation method of the bridge construction alignment risk analysis module is as follows: Read the foundation settlement evaluation coefficient χ of the bridge, the temperature deformation degree ρ of the beam body, and the safety degree l of the bridge structure respectively, and calculate the bridge construction alignment risk index w 1 、w 2 、w 3 respectively represent the weight factors of the foundation settlement evaluation coefficient, the temperature deformation degree of the beam body, and the safety degree of the bridge structure; it can comprehensively and synthetically evaluate the bridge construction alignment risk, consider the influence of different aspects on the bridge alignment, and avoid the limitations of single-factor evaluation.

[0070] The linear risk index of bridge construction involves three influencing parameters: the foundation settlement evaluation coefficient of the bridge, the temperature deformation degree of the beam body, and the safety degree of the bridge structure. Among them, the temperature deformation degree of the beam body is positively correlated with the linear risk index of bridge construction, and the foundation settlement evaluation coefficient of the bridge and the safety degree of the bridge structure are negatively correlated with the linear risk index of bridge construction.

[0071] It should be noted that, in a specific implementation, w 1 Can be set to 0.4,w 2 Can be set to 0.2, w 3 It can be set to 0.4. The foundation settlement has a huge impact on the linear shape of the bridge construction. The foundation settlement will change the height and position of the bridge piers, thereby affecting the support conditions of the beam body. If the foundation settlement is uneven, the height of the bridge piers will change. In this case, the beam body will be forced to produce deformations such as twisting and bending, which seriously affects the linear shape of the beam body. The temperature deformation of the beam body is a factor that cannot be ignored. Temperature changes will cause the expansion and contraction of the beam body. The temperature difference in different parts may cause the beam body to bend and deform. During the construction of the bridge, especially the long-span bridge, the deformation caused by temperature changes may be large. However, compared with the foundation settlement, the temperature deformation can be reduced to a certain extent through reasonable construction arrangements (such as selecting a suitable construction period) and structural design (such as setting expansion joints). The safety of the bridge structure is closely related to the linear risk. If there are safety hazards in the bridge structure, such as insufficient strength of the structural components and unreliable connection parts, the linear shape of the beam body may deviate due to the instability of the structure itself during the construction process. Therefore, the foundation settlement evaluation coefficient of the bridge and the corresponding weight of the safety degree of the bridge structure are higher.

[0072] The bridge construction linear risk index is compared with the bridge construction linear risk index threshold stored in the management database. If the bridge construction linear risk index is greater than or equal to the bridge construction linear risk index threshold, it means that the bridge construction linear risk situation is unqualified, otherwise it means that the bridge construction linear risk situation is qualified, and the bridge construction linear risk situation is fed back to the system; the possible risks of the bridge construction linear shape can be discovered in advance. If the risk index is close to or exceeds the threshold, timely measures can be taken to adjust and improve it, avoiding problems such as excessive linear deviation during the construction process, thereby ensuring the construction quality and structural safety of the bridge.

[0073] Management database for storing allowable stress ranges for steel bridges.

[0074] See also Figure 3As shown in the figure, in addition, the present invention provides a monitoring method for the construction alignment monitoring of continuous rigid frame bridges. The specific steps of the monitoring method are as follows: S1. Foundation settlement detection: Detect the foundation settlement parameters of the bridge piers. The foundation settlement parameters include the elevation fluctuation degree and verticality deviation of the foundation.

[0075] S2. Foundation settlement analysis: Analyze the settlement problems of the bridge pier foundation based on the foundation settlement parameters of the bridge piers.

[0076] S3. Beam alignment detection: Detect the alignment influence parameters of the beam. The alignment influence parameters include the relative displacement of the cantilever end, the relative displacement of each control point, and the elevation difference at both ends.

[0077] S4. Beam alignment analysis: Analyze the alignment deformation of the bridge based on the alignment influence parameters of the beam.

[0078] S5. Concrete pouring volume analysis: Judge whether it is necessary to adjust the concrete pouring volume according to the alignment deformation of the bridge and give feedback.

[0079] S6. Temperature deformation detection: Collect the temperatures of each part of the bridge beam at each temperature time point and calculate the temperature deformation degree of the beam.

[0080] S7. Bridge structure analysis: Estimate the construction loads that may occur in each construction process during the bridge construction, collect the stresses of each detection point on the bridge structure under the corresponding construction loads of each construction process in real time, and calculate the safety degree of the bridge structure.

[0081] S8. Bridge construction alignment risk analysis: Analyze the bridge construction alignment risk situation, judge whether the bridge construction alignment risk situation is qualified, and give feedback.

[0082] This system analyzes the settlement problems of the bridge pier foundation according to the foundation settlement parameters of the bridge piers, analyzes the alignment deformation of the bridge according to the alignment influence parameters of the beam, judges whether it is necessary to adjust the concrete pouring volume, and analyzes the bridge construction alignment risk situation in combination with the foundation settlement evaluation coefficient of the bridge, the temperature deformation degree of the beam, and the safety degree of the bridge structure, judges whether the bridge construction alignment risk situation is qualified, and gives feedback to the system, which can comprehensively consider various factors affecting the bridge construction alignment.

[0083] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention, and still be covered by the protection scope of the present invention.

Claims

1. A system for monitoring the construction line of a continuous steel structure bridge, characterized in that: The system specifically includes the following modules: The foundation settlement detection module is used to detect the foundation settlement parameters of the bridge piers. The foundation settlement parameters include the elevation fluctuation degree and verticality deviation of the foundation. The foundation settlement analysis module is used to analyze the settlement problem of the pier foundation according to the foundation settlement parameters of the pier; The beam linear detection module is used to detect the linear influencing parameters of the beam, including the relative displacement of the cantilever end, the relative displacement of each control point, and the elevation difference between the two ends; The beam linear analysis module is used to analyze the linear deformation of the bridge according to the linear influencing parameters of the beam; Concrete pouring volume analysis module, used to determine whether the concrete pouring volume needs to be adjusted according to the linear deformation of the bridge, and provide feedback; The temperature deformation detection module is used to collect the temperature of each part of the bridge beam at each temperature time point and calculate the temperature deformation degree of the beam; The bridge structure analysis module is used to estimate the construction loads that may be generated in each construction process during the bridge construction process, collect the stress of each detection point of the bridge structure under the corresponding construction load in each construction process in real time, and calculate the safety level of the bridge structure; The bridge construction line risk analysis module is used to analyze the bridge construction line risk situation, determine whether the bridge construction line risk situation is qualified, and provide feedback to the system; Management database for storing allowable stress ranges for steel bridges.

2. A system for monitoring the construction alignment of a continuous steel structure bridge according to claim 1, characterized in that: The specific operation method of the foundation settlement detection module is as follows: A1. Select several observation points beside the pier foundation according to the set interval, record them as observation points, and select each time point at a fixed time interval. Use a level to measure the elevation of each observation point at each time point. Calculate the average elevation of each observation point at each time point to get the average elevation of each observation point. Compare the elevation of each observation point at each time point with the average elevation of each observation point to get the elevation fluctuation degree of the pier foundation, record it as α; A2. Select the center points of the top and bottom of the piers, and import the center points of the top and bottom of each pier into the set two-dimensional position coordinate system to obtain the plane coordinates of the top and bottom of each pier. Calculate the vertical distance of the plane coordinates of the top and bottom of each pier, and calculate the verticality deviation of the pier through mean calculation, which is recorded as β.

3. The system for monitoring the construction alignment of a continuous steel structure bridge according to claim 2, characterized in that: The specific operation method of the foundation settlement analysis module is as follows: According to the elevation fluctuation degree of the pier foundation and the verticality deviation of the pier, the foundation settlement evaluation coefficient of the bridge is calculated. α0 and β0 represent the set elevation fluctuation degree of the pier foundation and the verticality deviation threshold of the pier, and φ1 and φ2 represent the preset weight factors of the elevation fluctuation degree of the pier foundation and the verticality deviation of the pier.

4. The system for monitoring the construction alignment of a continuous steel structure bridge according to claim 1, characterized in that: The specific operation method of the beam linear detection module is as follows: B1. According to the preset equal time interval principle, each construction time point is set during the cantilever construction process of the beam body, and the position of the cantilever end at each construction time point is imported into the set two-dimensional position coordinate system, and the first construction time point is taken as the initial time point, thereby obtaining the initial position coordinates of the cantilever end of the beam body and the position coordinates of each construction time point, and the relative displacement of the cantilever end of the beam body is obtained by calculation, which is recorded as d; B2. Pre-set a number of equally spaced measurement control points at both ends of the bridge beam, recorded as control points, and import the control points at both ends of the bridge beam into the set three-dimensional position coordinate system to obtain the initial three-dimensional coordinates of each control point of the beam; B3. According to the method of obtaining the initial three-dimensional coordinates of each control point of the beam body, the three-dimensional coordinates of each control point of the beam body are obtained again before the construction of the joint section, which are recorded as the three-dimensional coordinates of each control point of the beam body. The relative displacement of each control point of the beam body is calculated by the coordinate difference, which is recorded as d' f , f represents the number of the f-th control point, f = 1, 2, ..., k; B4. Use a level to measure the readings of the level rod at both ends of the beam in turn to obtain the elevations of both ends of the beam, and calculate the difference in elevation between the two ends of the beam, recorded as h.

5. The system for monitoring the construction alignment of a continuous steel structure bridge according to claim 14, characterized in that: The specific operation method of the beam linear analysis module is as follows: Read the relative displacement d of the cantilever end of the beam and the relative displacement d' of each control point of the beam f , the elevation difference h at both ends of the beam, and calculate the linear deformation evaluation coefficient of the bridge: Where d0, d'0, and h0 represent the preset relative displacement of the cantilever end of the beam, the relative displacement of the beam control point, and the threshold of the elevation difference between the two ends of the beam, respectively. They respectively represent the relative displacement of the cantilever end of the beam, the relative displacement of the control point of the beam, and the weight factor of the elevation difference between the two ends of the beam, and k represents the number of control points.

6. A system for monitoring the construction alignment of a continuous steel structure bridge according to claim 5, characterized in that: The specific operation method of the concrete pouring volume analysis module is as follows: The linear deformation evaluation coefficient of the bridge is compared with the preset linear deformation evaluation coefficient threshold of the bridge. If the linear deformation evaluation coefficient of the bridge is greater than or equal to the preset linear deformation evaluation coefficient threshold of the bridge, it means that the bridge linear shape is qualified and there is no need to adjust the concrete quantity. If the linear deformation evaluation coefficient of the bridge is less than the preset linear deformation evaluation coefficient threshold of the bridge, it means that the bridge linear shape is unqualified and the concrete quantity needs to be adjusted, and the bridge linear shape is fed back to the system.

7. The system for monitoring the construction alignment of a continuous steel structure bridge according to claim 1, characterized in that: The specific operation method of the temperature deformation detection module is as follows: C1. Arrange temperature sensors at various locations of the beam according to the bridge structure, including the mid-span, support, top center, and bottom center of the beam; C2. Set each temperature time point according to the preset equal time interval principle, collect the temperature of each temperature time point of each part of the bridge beam through the temperature sensor, construct a two-dimensional coordinate system with the temperature time point as the horizontal coordinate and the temperature as the vertical coordinate, and then mark several points in the constructed two-dimensional coordinate system according to the temperature corresponding to each temperature time point to form a temperature time point-temperature curve of each part of the bridge beam; C3. Calculate the slope of the temperature at the adjacent temperature time points in the temperature time point-temperature curve of each part of the bridge beam, and calculate the temperature slope of each part of the bridge beam by the mean value, that is, the temperature change rate of each part of the bridge beam, recorded as V p , p represents the number of the pth part of the bridge beam, p = 1, 2, ..., l; C4. Calculate the temperature deformation degree of the bridge beam according to the temperature change rate of each part of the bridge beam. Where l represents the number of parts of the bridge beam.

8. The system for monitoring the construction alignment of a continuous steel structure bridge according to claim 7, characterized in that: The specific operation method of the bridge structure analysis module is as follows: D1. Classify the construction load into static load and dynamic load. The static load includes the deadweight of the construction equipment and the deadweight of the poured concrete. The dynamic load includes the impact force during the lifting and lowering of the crane and the vibration force of the concrete. This will help estimate the construction load that may be generated during each construction process during the bridge construction process. D2. Set up various inspection points in the bridge structure according to the preset principles. During the bridge construction process, collect the stress of each inspection point of the bridge structure under the construction load corresponding to each construction process in real time as each construction process proceeds. Obtain the stress of each inspection point of the bridge structure under each construction load, compare it with the allowable stress range of the steel bridge stored in the management database, and calculate the safety degree of the bridge structure, which is recorded as l.

9. A system for monitoring the construction alignment of a continuous steel structure bridge according to claim 8, characterized in that: The specific operation method of the bridge construction linear risk analysis module is as follows: Read the foundation settlement evaluation coefficient χ of the bridge, the temperature deformation degree ρ of the beam body, and the safety degree l of the bridge structure respectively, and calculate the linear risk index of the bridge construction w1, w2, and w3 represent the weight factors of the foundation settlement evaluation coefficient of the bridge, the temperature deformation degree of the beam, and the safety degree of the bridge structure, respectively; The bridge construction linear risk index is compared with the bridge construction linear risk index threshold stored in the management database. If the bridge construction linear risk index is greater than or equal to the bridge construction linear risk index threshold, it means that the bridge construction linear risk situation is unqualified. Otherwise, it means that the bridge construction linear risk situation is qualified, and the bridge construction linear risk situation is fed back to the system.

10. A method for monitoring the construction line of a continuous steel structure bridge, characterized in that: The specific steps of the control method are as follows: S1. Foundation settlement detection: detect the foundation settlement parameters of the bridge piers, including the elevation fluctuation degree and verticality deviation of the foundation; S2. Foundation settlement analysis: Analyze the settlement of the pier foundation according to the foundation settlement parameters of the pier; S3. Beam linearity detection: Detect the linearity influencing parameters of the beam, including the relative displacement of the cantilever end, the relative displacement of each control point, and the elevation difference between the two ends; S4. Beam linear analysis: Analyze the linear deformation of the bridge based on the linear influencing parameters of the beam; S5. Concrete pouring volume analysis: Determine whether the concrete pouring volume needs to be adjusted based on the linear deformation of the bridge, and provide feedback; S6. Temperature deformation detection: collect the temperature of each part of the bridge beam at each temperature point in time, and calculate the temperature deformation degree of the beam; S7. Bridge structure analysis: estimate the construction loads that may be generated in each construction process during the bridge construction process, collect the stress of each inspection point of the bridge structure under the corresponding construction load in each construction process in real time, and calculate the safety level of the bridge structure; S8. Bridge construction alignment risk analysis: Analyze the bridge construction alignment risk situation, determine whether the bridge construction alignment risk situation is qualified, and provide feedback.

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