A method and system for safety assessment of high bridge piers during construction based on material stress analysis

Abstract

The present invention discloses a method and system for safety assessment of high piers in bridge construction based on material stress analysis, which relates to the field of safety assessment and includes: determining the construction environmental load according to the real-time construction environmental information and the construction weather prediction information; determining the dynamic safety index according to the historical data of high pier construction of the same type; generating the construction risk value in combination with the construction environmental load; determining the construction equipment load according to the equipment information used in the bridge high pier construction; generating the stress data of the bridge high pier based on the stress analysis software and predicting the structural change information of the to-be-constructed bridge high pier; setting safety parameters; obtaining the deviation degree of the bridge high pier according to the construction progress information and the safety parameters of the current bridge high pier; comparing the real-time construction environmental information and the construction weather prediction information to generate the weather correction coefficient of the current construction project; and evaluating the construction safety in combination with the construction risk value, the deviation degree of the bridge high pier and the weather correction coefficient of the current construction project.

Description

Technical Field

[0001] The present invention relates to the field of safety assessment, and specifically to a method and system for safety assessment of high pier construction of bridges based on material stress analysis. Background Art

[0002] A high pier of a bridge refers to a vertical column used to support the main structure of the bridge, usually located below or above the bridge deck. The structural forms of high piers of bridges are diverse and vary according to the type of bridge and geological conditions. Material stress analysis is an analysis method to obtain the internal stress distribution law through the external load action on the material. When the material is subjected to an external action, internal forces that resist the deformation caused by this external action will be generated inside it.

[0003] In traditional high pier construction of bridges, in terms of data collection, usually only basic data such as the strength of concrete test blocks and the bearing capacity of the foundation are collected, while data related to the construction environment are ignored, resulting in a large difference between the predicted construction period and the actual one, increasing the risks during the construction process. For the safety assessment of high piers of bridges, it often focuses on the strength and stability of the structure, ignoring the deformation of high piers during the construction process, and failing to fully consider the influence differences of the environment on different construction processes, leading to insufficient accuracy of the assessment results and being unable to comprehensively reflect the complexity and risks in high pier construction, and further resulting in the inability to timely discover potential safety hazards during the construction process. Summary of the Invention

[0004] To solve the above technical problems, a method and system for safety assessment of high pier construction of bridges based on material stress analysis are provided. The present technical solution solves the problems put forward in the above background art, including ignoring data related to the construction environment, resulting in a large difference between the predicted construction period and the actual one, increasing the risks during the construction process, ignoring the deformation of high piers during the construction process, failing to fully consider the influence differences of the environment on different construction processes, leading to insufficient accuracy of the assessment results, and being unable to comprehensively reflect the complexity and risks in high pier construction.

[0005] To achieve the above purposes, the technical solution adopted by the present invention is as follows:

[0006] A method for safety assessment of high pier construction of bridges based on material stress analysis, comprising:

[0007] Obtaining real-time construction environment information and construction weather prediction information, and determining the construction environment load;

[0008] Obtaining the construction history records of high piers of the same type of bridges and the data of the terrain undulation characteristics of high pier construction, establishing a terrain risk characteristic parameter table, and determining the dynamic safety index;

[0009] Generating a construction risk value according to the dynamic safety index and the construction weather prediction information, in combination with the construction environment load;

[0010] Obtain and analyze the bridge design plan, and determine the equipment information and material information used for the construction of high piers of the bridge;

[0011] Determine the construction equipment load according to the equipment information used for the construction of high piers of the bridge;

[0012] Based on the stress analysis software, input the construction environmental load, construction equipment load and the material information used for the construction of high piers of the bridge, conduct material stress analysis on the high piers of the bridge, generate the stress data of the high piers of the bridge and predict the structural change information of the high piers of the bridge to be constructed;

[0013] Set safety parameters according to the stress data of the high piers of the bridge and the structural change information of the high piers of the bridge to be constructed;

[0014] Obtain the construction progress information of the current high piers of the bridge, compare with the safety parameters, and obtain the deviation degree of the high piers of the bridge;

[0015] Compare the real-time construction environmental information and the construction weather prediction information, and combine with the construction progress information of the current high piers of the bridge to generate the weather correction coefficient of the current construction project;

[0016] Evaluate the construction safety level by combining the construction risk value, the deviation degree of the high piers of the bridge and the weather correction coefficient of the current construction project.

[0017] Preferably, the determination of the construction environmental load specifically includes:

[0018] Collect the meteorological data of the meteorological bureau where the bridge construction site is located, and determine the long-term meteorological fluctuation law of the area where the bridge construction site is located;

[0019] Use a total station for topographic surveying to obtain the topographic information of the construction site and its surrounding areas;

[0020] Establish a meteorological observation station according to the topographic information of the construction site and its surrounding areas;

[0021] Generate construction weather prediction information according to the long-term meteorological fluctuation law of the area where the bridge construction site is located and the real-time construction environmental information;

[0022] Set up water level observation holes around the construction site and regularly record the water level data around the construction site;

[0023] Obtain soil samples from the construction site and obtain the physical information of the soil at the construction site;

[0024] Generate the permeability data of the soil according to the water level data around the construction site and the physical information of the soil at the construction site;

[0025] Determine the height of the high piers of the bridge according to the bridge design plan, and obtain the wind load of the high piers of the bridge;

[0026] Generate the predicted humidity of the soil at the construction site based on the construction weather prediction information and the water level data around the construction site, and combine it with the permeability performance data of the soil to obtain the soil load at the construction site;

[0027] Collectively refer to the wind load of the high pier of the bridge and the soil load at the construction site as the construction environment load.

[0028] Preferably, the determination of the dynamic safety index specifically includes:

[0029] Classify the construction weather prediction information to generate meteorological element classification data;

[0030] Classify the high pier construction history records according to the meteorological element classification data to generate construction history data with the same meteorological elements;

[0031] Classify the construction history data with the same meteorological elements according to the construction type to generate construction type meteorological element history data;

[0032] Summarize the environmental characteristic data corresponding to the suspension of construction for each construction type by summarizing the construction type meteorological element history data, and record it as the risk characteristic threshold;

[0033] Generate a time-varying coefficient of meteorological construction risk based on the meteorological element classification data and the high pier construction history records;

[0034] Obtain the predicted time when the meteorological data reaches the risk characteristic threshold according to the construction weather prediction information;

[0035] Accumulate the time-varying coefficient of meteorological construction risk according to the predicted time when the meteorological data reaches the risk characteristic threshold to generate a predicted risk value;

[0036] Establish a terrain risk characteristic parameter table by combining the terrain undulation characteristic data of each high pier construction and the risk characteristic thresholds of each construction type;

[0037] Retrieve the terrain risk characteristic parameter table according to the terrain information of the construction site and its surrounding areas, and obtain the risk characteristic threshold corresponding to the current construction terrain as the dynamic safety index.

[0038] Preferably, the generation of the construction risk value specifically includes:

[0039] Determine the real-time wind direction and wind speed of the high pier of the bridge based on the real-time construction environment information to generate the real-time wind load of the high pier of the bridge;

[0040] Determine the wind load characteristic threshold and the soil load characteristic threshold based on the terrain risk characteristic parameter table;

[0041] According to the wind load characteristic threshold, determine the wind direction and wind speed corresponding to the wind load characteristic threshold, and combine the construction weather prediction information to obtain the predicted time to reach the wind load characteristic threshold;

[0042] Collect the current construction progress, and according to the high pier construction historical records, obtain the current construction progress and generate the predicted completion time;

[0043] According to the soil load characteristic threshold, determine the corresponding humidity of the soil load characteristic threshold;

[0044] Combine the water level data around the construction site and the construction weather prediction information to obtain the predicted time of the corresponding humidity to reach the soil load characteristic threshold;

[0045] Combine the predicted time to reach the wind load characteristic threshold, the predicted completion time and the predicted time of the corresponding humidity to reach the soil load characteristic threshold to generate the construction risk value;

[0046] Among them, the specific calculation formula of the construction risk value is:

[0047]

[0048] In the formula, P1 represents the construction risk value, α represents the predicted risk value of soil load construction, β represents the predicted risk value of wind load construction, a represents the current construction progress, e represents the natural constant, T2 represents the predicted completion time, T3 represents the predicted time of the corresponding humidity to reach the soil load characteristic threshold, and T1 represents the predicted time to reach the wind load characteristic threshold.

[0049] Preferably, the generation of the bridge high pier stress data and the prediction of the structural change information of the to-be-constructed bridge high pier specifically include:

[0050] According to the bridge design scheme, determine the shape and size of the expected bridge high pier, create a geometric model in the stress analysis software, and mark the geometric parameters;

[0051] According to the material information used in the construction of the bridge high pier, select a suitable material model in the software and mark the elastic modulus of the material model;

[0052] According to the structural geometric characteristics of the bridge high pier, divide the geometric model to generate a stress analysis area;

[0053] Input the construction environmental load and the construction equipment load into the stress analysis software to generate a load vector for the stress analysis area;

[0054] According to the elastic modulus of the material model in the stress analysis area, establish an initial tangent stiffness matrix;

[0055] Combined with the initial tangent stiffness matrix and the load vectors of the corresponding stress analysis regions, the unbalanced force vector and the number of unbalanced forces of the stress analysis regions are generated. The unbalanced force vector and the number of forces of the stress analysis regions are collectively referred to as the high pier stress data of the bridge;

[0056] Set an initial displacement vector, combined with the unbalanced force vector of the stress analysis region, perform iteration, update the displacement vector, obtain the updated displacement vector of each iteration, and predict the structural change information of the high pier of the bridge to be constructed;

[0057] Among them, the specific calculation formula of the unbalanced force vector is:

[0058] {R i} = {F} - [K T (δ i )]{δ i};

[0059] In the formula, {R i} represents the unbalanced force vector of the i-th iteration, {F} represents the load vector of the stress analysis region, [K T (δ i )] represents the tangent stiffness matrix of the i-th iteration, and {δ i} represents the updated displacement vector of the i-th iteration;

[0060] The specific calculation formula of the updated displacement vector is:

[0061] {δ i} = {δ i-1} + [K T (δ i-1 )] -1 {R i-1};

[0062] In the formula, {δ i} represents the updated displacement vector of the i-th iteration, {δ i-1} represents the updated displacement vector of the (i - 1)-th iteration, [K T (δ i-1 )] represents the tangent stiffness matrix of the (i - 1)-th iteration, and {R i-1} represents the unbalanced force vector of the (i - 1)-th iteration.

[0063] Preferably, setting the safety parameters according to the high pier stress data of the bridge and the structural change information of the high pier of the bridge to be constructed specifically includes:

[0064] Based on the stress analysis software, obtain the force vectors applied to each stress analysis region;

[0065] According to the number of forces and the force vectors of the stress analysis region, determine the unbalanced force norm;

[0066] Compare the unbalanced force norm and the unbalanced force vector, and obtain the number of iterations when the unbalanced force norm is less than the unbalanced force vector, which is denoted as the final number of iterations;

[0067] According to the final number of iterations, determine the updated displacement vector of the final iteration as the safety parameter;

[0068] Among them, the specific calculation formula of the unbalanced force norm is:

[0069]

[0070] In the formula, ||{R}||2 represents the unbalanced force norm, and R m represents the m-th force vector in the stress analysis area, and n represents the number of forces in the stress analysis area.

[0071] Preferably, the obtaining of the deviation degree of the high pier of the bridge specifically includes:

[0072] Based on the stress analysis software, input the updated displacement vector of the final iteration to generate the maximum displacement threshold for each height of the high pier of the bridge;

[0073] Taking the central axis of the high pier of the bridge as the reference and the center of the bottom surface of the high pier of the bridge as the coordinate origin, the high pier of the bridge is dissected by eight vertical sections passing through the center of the circle to generate sixteen groups of outer surface coordinate functions on the same horizontal plane. Every one meter in the vertical direction, obtain the outer surface plane coordinate function of the current high pier of the bridge;

[0074] According to the bridge design scheme, obtain the expected height of the high pier of the bridge and the corresponding outer surface plane coordinate function for each expected height;

[0075] Combining the maximum displacement threshold for each height of the bridge height, the outer surface plane coordinate function of the current high pier of the bridge, the corresponding outer surface plane coordinate function for each expected height, and the expected height of the high pier of the bridge, obtain the deviation degree of the high pier of the bridge;

[0076] Among them, the specific calculation formula of the deviation degree of the high pier of the bridge is:

[0077]

[0078] In the formula, P2 represents the deviation degree of the high pier of the bridge, h represents the total number of collectable times of the expected outer surface plane coordinate function of the high pier of the bridge, b represents the total number of collectable times of the outer surface plane coordinate function of the current high pier of the bridge, f(x l ) represents the expected outer surface plane coordinate function of the high pier of the bridge at the l-th collection, f(y l ) represents the outer surface plane coordinate function of the current high pier of the bridge at the l-th collection, x lmax represents the maximum displacement threshold corresponding to the l-th collection height of the high pier of the bridge.

[0079] Preferably, generating the weather correction coefficient for the current construction project specifically includes:

[0080] Combining the current construction progress of the high pier of the bridge and the high pier construction history records, obtaining the required weather environment for the current construction project and the allowable deviation range value of the construction environment;

[0081] Setting the weather parameter weights according to the required weather environment of the current construction project;

[0082] Obtaining the current construction environment information in the construction weather prediction information, denoted as the weather prediction verification environment information;

[0083] Combining the real-time construction environment information and the weather prediction verification environment information, obtaining the weather parameter deviation value;

[0084] Generating the weather correction coefficient according to the required weather environment of the current construction project and the weather parameter deviation value;

[0085] Among them, the specific calculation formula of the weather correction coefficient is:

[0086]

[0087] In the formula, C represents the weather correction coefficient, Δv represents the weather parameter deviation value, and G represents the allowable deviation range value of the construction environment of the current construction project.

[0088] Preferably, evaluating the construction safety level specifically includes:

[0089] Setting the initial weight coefficients of the construction risk value, the deviation degree of the high pier of the bridge, and the weather correction coefficient of the current construction project according to the high pier construction historical data of the same type of bridge design scheme;

[0090] Adjusting each initial weight coefficient according to the high pier construction terrain data to generate the comprehensive weight coefficient;

[0091] Combining the construction risk value, the deviation degree of the high pier of the bridge, the weather correction coefficient of the current construction project, and the corresponding comprehensive weight coefficient to generate the safety evaluation value;

[0092] Setting the safety level boundary value, comparing the safety evaluation value with the safety level boundary value, and evaluating the construction safety level.

[0093] Furthermore, a bridge high pier construction safety evaluation system based on material stress analysis is proposed, which is used to implement the above-mentioned bridge high pier construction safety evaluation method based on material stress analysis, including:

[0094] A data acquisition module, which is used to collect real-time environmental information of the construction site through instruments and equipment, obtain the construction progress information of the current bridge high pier, and collect the high pier construction historical data of the design schemes of the same type of bridges;

[0095] A data integration module, which is used to determine the construction environmental load according to the real-time construction environmental information and the construction weather prediction information, establish a topographic risk characteristic parameter table according to the high pier construction historical data of the design schemes of the same type of bridges, determine the dynamic safety index, and determine the construction equipment load according to the equipment information used in the bridge high pier construction;

[0096] A stress analysis module, which is used to calculate and analyze the material stress of the bridge high pier according to the stress analysis software, based on the input construction environmental load, construction equipment load and the material information used in the bridge high pier construction, and obtain the stress data of each part of the bridge high pier during construction;

[0097] A historical data storage module, which is used to store the high pier construction historical data of the design schemes of the same type of bridges, and provide data backtracking and trend analysis functions to provide reference for subsequent construction;

[0098] A safety assessment module, which is used to generate the unbalanced force vector of each stress analysis area of the constructed bridge high pier by combining the elastic modulus, compressive strength, tensile strength, load condition of the material and the stress analysis result;

[0099] A risk warning module, which is used to perform real-time analysis on the real-time construction environmental information through the set safety parameters and construction risk values, judge whether there are potential safety hazards, and start early warning and stop construction if necessary.

[0100] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0101] The present invention provides a method and system for safety assessment of high piers in bridge construction based on material stress analysis. According to real-time construction environment information and construction weather prediction information, the construction environment load is determined. Based on the historical data of high pier construction in the design schemes of the same type of bridges, dynamic safety indicators are determined. Combining the construction environment load, a construction risk value is generated. According to the equipment information used in the high pier construction of the bridge, the construction equipment load is determined. Based on stress analysis software, stress data of the high pier of the bridge is generated and the structural change information of the high pier of the bridge to be constructed is predicted. Safety parameters are set. According to the construction progress information of the current high pier of the bridge, the safety parameters are compared to obtain the deviation degree of the high pier of the bridge. Comparing the real-time construction environment information and the construction weather prediction information, a weather correction coefficient for the current construction project is generated. Combining the construction risk value, the deviation degree of the high pier of the bridge, and the weather correction coefficient of the current construction project, the construction safety level is evaluated. In this way, data related to the construction environment is fully considered, making the predicted construction period more in line with the actual situation, reducing the risks during the construction process, combining the deformation conditions of the high pier of the bridge during the construction process, comprehensively considering the influence differences of the environment on different construction processes, and ensuring the accuracy of the evaluation results. BRIEF DESCRIPTION OF THE DRAWINGS

[0102] Figure 1 is a flow chart of the method for safety assessment of high piers in bridge construction based on material stress analysis proposed by the present invention;

[0103] Figure 2 is a flow chart of the steps for determining the construction environment load in the present invention;

[0104] Figure 3 is a flow chart of the steps for determining the dynamic safety indicators in the present invention;

[0105] Figure 4 is a flow chart of the steps for generating the construction risk value in the present invention;

[0106] Figure 5 is a flow chart of the steps for generating stress data of the high pier of the bridge and predicting the structural change information of the high pier of the bridge to be constructed in the present invention;

[0107] Figure 6 is a flow chart of the steps for generating the weather correction coefficient for the current construction project in the present invention;

[0108] Figure 7 is a structural diagram of the system for safety assessment of high piers in bridge construction based on material stress analysis proposed by the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0109] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art can think of other obvious variations.

[0110] Refer to Figure 1As shown in the figure, a safety assessment method for the construction of high piers of bridges based on material stress analysis includes:

[0111] Obtain real-time construction environment information and construction weather prediction information, and determine the construction environment load;

[0112] Obtain the construction history records of high piers of the same type of bridges and the data of the undulating characteristics of the terrain for high pier construction, establish a terrain risk characteristic parameter table, and determine the dynamic safety index;

[0113] According to the dynamic safety index and the construction weather prediction information, and in combination with the construction environment load, generate a construction risk value;

[0114] Obtain and analyze the bridge design scheme, and determine the equipment information and material information used for the construction of high piers of the bridge;

[0115] According to the equipment information used for the construction of high piers of the bridge, determine the construction equipment load;

[0116] Based on the stress analysis software, input the construction environment load, the construction equipment load, and the material information used for the construction of high piers of the bridge, conduct a material stress analysis on the high piers of the bridge, generate the stress data of the high piers of the bridge, and predict the structural change information of the high piers of the bridge to be constructed;

[0117] According to the stress data of the high piers of the bridge and the structural change information of the high piers of the bridge to be constructed, set safety parameters;

[0118] Obtain the construction progress information of the current high piers of the bridge, compare with the safety parameters, and obtain the deviation degree of the high piers of the bridge;

[0119] Compare the real-time construction environment information and the construction weather prediction information, and in combination with the construction progress information of the current high piers of the bridge, generate a weather correction coefficient for the current construction project;

[0120] In combination with the construction risk value, the deviation degree of the high piers of the bridge, and the weather correction coefficient of the current construction project, evaluate the construction safety level.

[0121] This solution determines the construction environment load according to the real-time construction environment information and the construction weather prediction information, determines the dynamic safety index according to the historical data of high pier construction in the design scheme of the same type of bridges, generates the construction risk value in combination with the construction environment load, determines the construction equipment load according to the equipment information used for the construction of high piers of the bridge, generates the stress data of the high piers of the bridge and predicts the structural change information of the high piers of the bridge to be constructed based on the stress analysis software, sets the safety parameters, obtains the deviation degree of the high piers of the bridge by comparing with the safety parameters according to the construction progress information of the current high piers of the bridge, generates the weather correction coefficient of the current construction project by comparing the real-time construction environment information and the construction weather prediction information, and evaluates the construction safety level in combination with the construction risk value, the deviation degree of the high piers of the bridge, and the weather correction coefficient of the current construction project.

[0122] Refer to Figure 2 as shown, determine the construction environmental loads, specifically including:

[0123] Collect the meteorological data of the meteorological bureau where the bridge construction site is located, and determine the long-term meteorological fluctuation law of the area where the bridge construction site is located;

[0124] Use a total station for topographic surveying and mapping to obtain the topographic information of the construction site and its surrounding areas;

[0125] Establish a meteorological observation station based on the topographic information of the construction site and its surrounding areas;

[0126] Generate construction weather prediction information based on the long-term meteorological fluctuation law of the area where the bridge construction site is located and the real-time construction environment information;

[0127] Set up water level observation holes around the construction site and regularly record the water level data around the construction site;

[0128] Obtain soil samples from the construction site and obtain the physical information of the soil at the construction site;

[0129] Generate the permeability performance data of the soil based on the water level data around the construction site and the physical information of the soil at the construction site;

[0130] Determine the height of the high pier of the bridge according to the bridge design scheme and obtain the wind load of the high pier of the bridge;

[0131] Generate the predicted humidity of the soil at the construction site based on the construction weather prediction information and the water level data around the construction site, and combine the permeability performance data of the soil to obtain the soil load at the construction site;

[0132] Collectively refer to the wind load of the high pier of the bridge and the soil load at the construction site as the construction environmental load.

[0133] It is understandable that construction environmental load refers to the load acting on the structure or construction site during the construction process due to natural environmental factors. The construction environmental load of high piers of bridges can be mainly divided into wind load and soil load at the construction site. Wind load will affect the stability of construction equipment. For example, when a crane is lifting heavy objects, strong wind may cause the crane to become unstable. At the same time, wind load will also generate a large lateral force on the formwork and scaffolding systems of structures such as high piers, which may lead to accidents such as formwork deformation and scaffolding collapse. During the construction process, it is necessary to reasonably arrange construction tasks according to weather forecasts. When the wind speed is relatively high, stop high-altitude operations and the lifting operations of large equipment. The soil at the construction site will vary depending on the region. In mountainous areas, due to the large topographic undulations, the types of soil are diverse, which in turn leads to significant differences in the drainage performance of mountainous soil due to the terrain. Surface runoff is likely to form on slopes, which may cause soil erosion and affect the stability of the construction site. The soil in plain areas is relatively uniform, and most of the soil is fine-grained soil such as silt and clay. These soils have fine particles and certain cohesion. When constructing high piers of bridges in plain areas, this type of soil is easy to form after excavation. However, if it is a soft soil foundation (such as highly compressible clay), it may cause foundation settlement problems. For the construction of high piers of bridges, water level observation holes should be set around the foundation and in areas that may be affected by groundwater. At the same time, the distribution of different strata should be considered to monitor the water level changes in different soil layers. Generally speaking, 3-5 observation holes can be set for a relatively small construction site, while for a large and complex geological site, more than 10 observation holes may be required to obtain the water level data around the construction site.

[0134] Refer to Figure 3 as shown, to determine the dynamic safety index, specifically including:

[0135] Classify the construction weather prediction information to generate meteorological element classification data;

[0136] According to the meteorological element classification data, classify the construction history records of high piers to generate construction history data with the same meteorological elements;

[0137] Classify the construction history data with the same meteorological elements by construction type to generate construction type meteorological element history data;

[0138] Summarize the construction type meteorological element history data to summarize the environmental characteristic data corresponding to the suspension of construction for each construction type, denoted as the risk characteristic threshold;

[0139] Generate a time-varying coefficient of meteorological construction risk according to the meteorological element classification data and the construction history records of high piers;

[0140] According to the construction weather prediction information, obtain the predicted time when the meteorological data reaches the risk characteristic threshold;

[0141] According to the predicted time when meteorological data reaches the risk characteristic threshold, accumulate the time-varying coefficient of meteorological construction risk to generate a predicted risk value;

[0142] Combine the terrain undulation characteristic data of each high pier construction and the risk characteristic thresholds of each construction type to establish a terrain risk characteristic parameter table;

[0143] According to the terrain information of the construction site and its surrounding areas, retrieve the terrain risk characteristic parameter table to obtain the risk characteristic threshold corresponding to the current construction terrain as a dynamic safety index.

[0144] It can be understood that due to the differences in the terrain undulation characteristics of the construction, the construction methods of bridge high piers will be different, and thus different requirements for the construction environment. According to the terrain undulation characteristic data of high pier construction, classify and organize the high pier construction historical records to obtain the risk characteristic thresholds of each construction type. Combining the construction weather prediction information, the time required to reach the risk characteristic threshold can be obtained. Establish a separate risk characteristic parameter table for the terrain undulation characteristic data of high pier construction. In the separate risk characteristic parameter table, based on the construction type, the data of each construction type nests the corresponding risk characteristic thresholds, and the risk characteristic thresholds nest the time required for different meteorological data to reach the risk characteristic threshold. Integrate multiple separate risk characteristic parameter tables to generate a terrain risk characteristic parameter table.

[0145] Refer to Figure 4 As shown, generate the construction risk value, specifically including:

[0146] According to the real-time construction environment information, determine the real-time wind direction and wind speed of the bridge high pier to generate the real-time wind load of the bridge high pier;

[0147] Based on the terrain risk characteristic parameter table, determine the wind load characteristic threshold and the soil load characteristic threshold;

[0148] According to the wind load characteristic threshold, determine the wind direction and wind speed corresponding to the wind load characteristic threshold, and combine the construction weather prediction information to obtain the predicted time to reach the wind load characteristic threshold;

[0149] Collect the current construction progress. According to the high pier construction historical records, obtain the current construction progress to generate the predicted completion time. Quantify the high pier construction historical records according to the construction time length. Set the construction progress percentage based on the construction progress in the high pier construction historical records. Compare the current construction progress with the construction progress in the high pier construction historical records to determine the percentage corresponding to the current construction progress, denoted as the current construction progress. Multiply the high pier construction historical time by the current construction progress to generate the predicted completion time;

[0150] According to the soil load characteristic threshold, determine the corresponding humidity of the soil load characteristic threshold;

[0151] Combined with the water level data around the construction site and the construction weather prediction information, obtain the corresponding humidity prediction time to reach the soil load characteristic threshold;

[0152] Combined with the predicted time to reach the wind load characteristic threshold, the predicted completion time, and the corresponding humidity prediction time to reach the soil load characteristic threshold, generate the construction risk value;

[0153] Among them, the specific calculation formula for the construction risk value is:

[0154]

[0155] In the formula, P1 represents the construction risk value, α represents the predicted risk value of soil load construction, β represents the predicted risk value of wind load construction, a represents the current construction progress, e represents the natural constant, T2 represents the predicted completion time, T3 represents the corresponding humidity prediction time to reach the soil load characteristic threshold, and T1 represents the predicted time to reach the wind load characteristic threshold.

[0156] It can be understood that the construction progress determines the remaining construction period. As the construction period extends, materials such as cement used in the construction process may change in performance due to the influence of environmental humidity, thereby affecting the construction quality. The longer the time, the more inaccurate the prediction results of the environment. The extension of the construction period may cause the environmental data corresponding to the risk characteristic threshold to be realized in advance, increasing the risk during the construction process.

[0157] Refer to Figure 5 As shown, generate the stress data of the high pier of the bridge and predict the structural change information of the high pier of the bridge to be constructed, specifically including:

[0158] According to the bridge design scheme, determine the shape and size of the expected high pier of the bridge, create a geometric model in the stress analysis software, and mark the geometric parameters;

[0159] According to the material information used in the construction of the high pier of the bridge, select a suitable material model in the software and mark the elastic modulus of the material model;

[0160] According to the structural geometric characteristics of the high pier of the bridge, divide the geometric model to generate the stress analysis area;

[0161] Input the construction environmental load and construction equipment load into the stress analysis software to generate the load vector of the stress analysis area;

[0162] According to the elastic modulus of the material model in the stress analysis area, establish the initial tangent stiffness matrix;

[0163] Combining the initial tangent stiffness matrix and the load vectors of the corresponding stress analysis regions, generate the unbalanced force vector and the number of unbalanced forces in the stress analysis region. The unbalanced force vector and the number of forces in the stress analysis region are collectively referred to as the bridge high pier stress data;

[0164] Set an initial displacement vector, combine it with the unbalanced force vector in the stress analysis region, perform iteration, update the displacement vector, obtain the updated displacement vector for each iteration, and predict the structural change information of the to-be-constructed bridge high pier;

[0165] Among them, the specific calculation formula for the unbalanced force vector is:

[0166] {R i} = {F} - [K T (δ i )]{δ i};

[0167] In the formula, {R i} represents the unbalanced force vector of the i-th iteration, {F} represents the load vector in the stress analysis region, [K T (δ i )] represents the tangent stiffness matrix of the i-th iteration, and {δ i} represents the updated displacement vector of the i-th iteration;

[0168] The specific calculation formula for the updated displacement vector is:

[0169] {δ i} = {δ i-1} + [K T (δ i-1 )] -1 {R i-1};

[0170] In the formula, {δ i} represents the updated displacement vector of the i-th iteration, {δ i-1} represents the updated displacement vector of the (i - 1)-th iteration, [K T (δ i-1 )] represents the tangent stiffness matrix of the (i - 1)-th iteration, and {R i-1} represents the unbalanced force vector of the (i - 1)-th iteration.

[0171] It is understandable that, affected by the construction environment load and the construction equipment load, the outside world will exert an external force on the high bridge piers, and the high bridge piers will resist the external force due to the physical characteristics of their own materials. When the external force reaches a certain limit, they will generate internal forces to be exerted on their own regions. Because the external force is constantly changing, the external force and internal force of the high bridge piers cannot be balanced. After the two are mutually restricted, there is still an unbalanced force. Because the structural material of the high bridge piers is elastic, the unbalanced force will cause the high bridge piers to produce elastic deformation and displacement. Due to the particularity of the structure of the high bridge piers, the external force and internal force are different at each position. The upper part of the high bridge pier is subjected to a large wind load, which will produce a large lateral thrust or pull on the high pier. The bottom of the high pier serves as the connection between the structure and the foundation. The joint has to bear the inertia force of the entire superstructure. There is a force acting on the high pier along the central axis, which is called axial force. The axial force is the largest at the bottom of the high pier and gradually decreases upward along the high pier. Therefore, it is necessary to divide the stress analysis area. According to the total height of the high pier, every one meter is divided into an area, and then the area is divided into several unit segments with equal height. In the cross section, it can be divided into eight quadrants according to the principle of symmetry. For high piers with changing cross-sectional dimensions along the height direction, they can be segmented according to the nodes where the cross-sectional dimensions change. For example, the gradual transition section where the pier body transitions from a large cross-section to a small cross-section is divided into one separately. Each cross-sectional mutation point is also used as a dividing boundary to divide the high pier into multiple different unit segments, which is convenient for analyzing the stress changes in different parts when subjected to force.

[0172] Furthermore, according to the stress data of the bridge pier and the structural change information of the bridge pier to be constructed, safety parameters are set, including:

[0173] Based on the stress analysis software, the force vectors applied to the stress analysis area are obtained;

[0174] According to the number of forces and force vectors in the stress analysis area, the unbalanced force norm is determined. The unbalanced force norm is an indicator to measure the degree of unbalanced force of the structure during the iterative calculation process.

[0175] Compare the unbalanced force norm and the unbalanced force vector, and obtain the number of iterations in which the unbalanced force norm is smaller than the unbalanced force vector, which is recorded as the final number of iterations;

[0176] According to the final number of iterations, the updated displacement vector of the final iteration is determined as a safety parameter;

[0177] Among them, the specific calculation formula of the unbalanced force norm is:

[0178]

[0179] In the formula, ||{R}||2 represents the norm of unbalanced force, R mThe m-th force vector represents the stress analysis area, and n represents the number of forces on the stress analysis area.

[0180] It can be understood that when conducting material stress analysis on high piers of bridges, it is necessary to judge whether the structure reaches the equilibrium state based on the unbalanced force norm. For example, when analyzing the ultimate bearing capacity of high piers under complex load combinations, as the load gradually increases, the deformation of the structure will also continuously increase. By monitoring the change of the unbalanced force norm, it can be determined whether the structure loses stability. If the unbalanced force norm is less than a certain unbalanced force vector, it indicates that the structure has reached the limit state at this time. Obtain the iteration number at this time and substitute it into the calculation formula for updating the displacement vector to determine the maximum updated displacement vector.

[0181] Furthermore, obtain the deviation degree of the high pier of the bridge, specifically including:

[0182] Based on the stress analysis software, input the updated displacement vector of the final iteration to generate the maximum displacement threshold for each height of the high pier of the bridge;

[0183] Taking the central axis of the high pier of the bridge as the reference and the center of the bottom surface of the high pier of the bridge as the coordinate origin, conduct eight vertical cross-section dissections of the high pier of the bridge passing through the center of the circle to generate sixteen groups of outer surface coordinate functions on the same horizontal plane. Every one meter in the vertical direction, obtain the outer surface plane coordinate function of the current high pier of the bridge once;

[0184] According to the bridge design scheme, obtain the expected height of the high pier of the bridge and the corresponding outer surface plane coordinate functions for each expected height;

[0185] Combining the maximum displacement threshold for each height of the bridge height, the outer surface plane coordinate function of the current high pier of the bridge, the corresponding outer surface plane coordinate functions for each expected height, and the expected height of the high pier of the bridge, obtain the deviation degree of the high pier of the bridge;

[0186] Among them, the specific calculation formula for the deviation degree of the high pier of the bridge is:

[0187]

[0188] In the formula, P2 represents the deviation degree of the high pier of the bridge, h represents the total number of collectable times of the expected outer surface plane coordinate function of the high pier of the bridge, b represents the total number of collectable times of the outer surface plane coordinate function of the current high pier of the bridge, f(x l ) represents the expected outer surface plane coordinate function of the high pier of the bridge at the l-th collection, f(y l ) represents the outer surface plane coordinate function of the current high pier of the bridge at the l-th collection, x lmax represents the maximum displacement threshold corresponding to the height of the high pier of the bridge at the l-th collection.

[0189] It is understandable that during the construction process of high bridge piers, due to the influence of environmental external forces, the deformation of the outer surface will inevitably occur, resulting in irregular protrusions or depressions on the outer surface, making the difference between the actual constructed bridge and the expected idea of the bridge design plan. The difference between such protrusions or depressions and the expected outer appearance of the high bridge pier is called the deviation degree of the high bridge pier.

[0190] Refer to Figure 6 As shown, generate the weather correction coefficient for the current construction project, specifically including:

[0191] Combined with the current construction progress of the high bridge pier and the construction history record of the high pier, obtain the required weather environment and the allowable deviation range value of the construction environment for the current construction project;

[0192] According to the required weather environment of the current construction project, set the weight of weather parameters;

[0193] Obtain the current construction environment information in the construction weather prediction information, denoted as the weather prediction verification environment information;

[0194] Combined with the real-time construction environment information and the weather prediction verification environment information, obtain the weather parameter deviation value;

[0195] According to the required weather environment and the weather parameter deviation value of the current construction project, generate the weather correction coefficient;

[0196] Among them, the specific calculation formula of the weather correction coefficient is:

[0197]

[0198] In the formula, C represents the weather correction coefficient, Δv represents the weather parameter deviation value, and G represents the allowable deviation range value of the construction environment for the current construction project.

[0199] It is understandable that different construction projects have different requirements for the construction environment. During the concrete pouring process, temperature is a key factor. If the temperature correction coefficient shows that the actual temperature is lower than the expected suitable temperature range, the setting time of the concrete will be prolonged, which may lead to slow growth of concrete strength. In this case, if the formwork is removed or prestress is applied according to the normal construction progress, structural collapse may be caused due to insufficient concrete strength. In the high-altitude operation of bridge piers, wind speed has a great impact on safety. When the wind speed correction coefficient shows that the actual wind speed is relatively high, it will pose a direct threat to the safety of construction workers. Workers operating on the high-altitude scaffolding will be blown by strong winds, increasing the risk of falling from a height. At the same time, strong winds will also cause large lateral forces on the construction equipment, resulting in equipment shaking, tilting, or even toppling, triggering serious safety accidents. For the hoisting operations of some large components, such as the hoisting of bridge girders or large building steel structures, when the wind speed is too high, the components will be subjected to large wind loads in the air. During the construction stage of building or bridge foundations, in case of rainfall, the rainfall correction coefficient can reflect the impact of rainfall on the safety of the foundation pit. If the rainfall is too large, the foundation pit may accumulate water, resulting in a decrease in the shear strength of the soil on the side wall of the foundation pit and increasing the risk of foundation pit collapse. For example, in the foundation pit of soft soil foundation, the stability of the soil drops sharply after being soaked by rainwater. Once the foundation pit collapses, it will bury construction equipment and personnel, causing serious safety accidents. For pile foundation construction, excessive rainfall may affect the water level in the pile hole, increasing the difficulty and danger of dug pile construction. At the same time, rainwater scouring may cause the soil around the pile hole to loosen, affecting the bearing capacity and stability of the pile.

[0200] Furthermore, to evaluate the construction safety level, it specifically includes:

[0201] According to the historical construction data of high pier construction in the design scheme of the same type of bridge, set the initial weight coefficients of the construction risk value, the deviation degree of the bridge pier, and the weather correction coefficient of the current construction project;

[0202] According to the topographic data of high pier construction, adjust each initial weight coefficient to generate a comprehensive weight coefficient;

[0203] Combine the construction risk value, the deviation degree of the bridge pier, the weather correction coefficient of the current construction project, and the corresponding comprehensive weight coefficient to generate a safety evaluation value;

[0204] Set the safety level demarcation value, compare the safety evaluation value with the safety level demarcation value to evaluate the construction safety level. When the safety evaluation value is close to 0, it indicates that the construction safety degree is relatively high and the risk is relatively low. When the safety evaluation value is close to 1, it indicates that the construction safety degree is relatively low and the risk is relatively high, and emergency measures need to be taken immediately. When the safety evaluation value is between 0.3 and 0.7, it indicates that the construction safety degree is medium and monitoring and prevention need to be strengthened.

[0205] Furthermore, referring to Figure 7 as shown, in accordance with the same inventive concept as the bridge high pier construction safety assessment method based on material stress analysis, this solution proposes a bridge high pier construction safety assessment system based on material stress analysis, including:

[0206] A data acquisition module, which is used to collect real-time environmental information of the construction site through instruments and equipment, obtain the construction progress information of the current bridge high pier, and collect the high pier construction historical data of the same type of bridge design scheme;

[0207] A data integration module, which is used to determine the construction environmental load according to the real-time construction environmental information and construction weather prediction information, establish a terrain risk characteristic parameter table according to the high pier construction historical data of the same type of bridge design scheme, determine the dynamic safety index, and determine the construction equipment load according to the equipment information used in the bridge high pier construction;

[0208] A stress analysis module, which is used to calculate and analyze the material stress of the bridge high pier according to the stress analysis software, based on the input construction environmental load, construction equipment load, and material information used in the bridge high pier construction, and obtain the stress data of each part of the bridge high pier during construction;

[0209] A historical data storage module, which is used to store the high pier construction historical data of the same type of bridge design scheme, and provide functions such as data backtracking and trend analysis to provide reference for subsequent construction;

[0210] A safety assessment module, which is used to generate an unbalanced force vector for each stress analysis area of the constructed bridge high pier by combining the elastic modulus, compressive strength, tensile strength, load conditions of the material, and stress analysis results;

[0211] A risk warning module, which is used to perform real-time analysis on the real-time construction environmental information through the set safety parameters and construction risk values, determine whether there are potential safety hazards, and start a warning and stop construction if necessary.

[0212] In summary, the advantages of the present invention are as follows: It fully considers the data related to the construction environment, making the predicted construction period more in line with the actual situation, reducing the risks during the construction process, combining the deformation conditions of the bridge high pier during the construction process, comprehensively considering the influence differences of the environment on different construction processes, and ensuring the accuracy of the assessment results.

[0213] The basic principles, main features and advantages of the present invention have been shown and described above. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification is only the principle of the present invention. Without departing from the spirit and scope of the present invention, various changes and improvements will occur to the present invention, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for safety assessment of high bridge piers during construction based on material stress analysis, characterized in that, Including: Obtain real-time construction environment information and construction weather prediction information, and determine the construction environment load; Obtain the construction history records of high piers of the same type of bridge and the terrain undulation characteristic data of high pier construction, establish a terrain risk characteristic parameter table, and determine the dynamic safety index; Generate a construction risk value according to the dynamic safety index, the construction weather prediction information, and in combination with the construction environment load; Obtain and analyze the bridge design scheme, and determine the equipment information and material information used in the construction of the high pier of the bridge; Determine the construction equipment load according to the equipment information used in the construction of the high pier of the bridge; Based on the stress analysis software, input the construction environment load, the construction equipment load, and the material information used in the construction of the high pier of the bridge, conduct a material stress analysis on the high pier of the bridge, generate the stress data of the high pier of the bridge, and predict the structural change information of the high pier of the bridge to be constructed; Set safety parameters according to the stress data of the high pier of the bridge and the structural change information of the high pier of the bridge to be constructed; Obtain the construction progress information of the current high pier of the bridge, compare it with the safety parameters, and obtain the deviation degree of the high pier of the bridge; Compare the real-time construction environment information and the construction weather prediction information, and in combination with the construction progress information of the current high pier of the bridge, generate the weather correction coefficient of the current construction project; Evaluate the construction safety level in combination with the construction risk value, the deviation degree of the high pier of the bridge, and the weather correction coefficient of the current construction project; The generating the stress data of the high pier of the bridge and predicting the structural change information of the high pier of the bridge to be constructed specifically includes: According to the bridge design scheme, determine the shape and size of the expected high pier of the bridge, create a geometric model in the stress analysis software, and mark the geometric parameters; According to the material information used in the construction of the high pier of the bridge, select a suitable material model in the software and mark the elastic modulus of the material model; Divide the geometric model according to the structural geometric characteristics of the high pier of the bridge to generate a stress analysis area; Input the construction environment load and the construction equipment load into the stress analysis software to generate a load vector of the stress analysis area; Establish an initial tangent stiffness matrix according to the elastic modulus of the material model in the stress analysis area; Combine the initial tangent stiffness matrix and the load vector of each corresponding stress analysis area to generate an unbalanced force vector and the number of unbalanced forces in the stress analysis area, and collectively refer to the unbalanced force vector and the number of forces in the stress analysis area as the stress data of the high pier of the bridge; Set an initial displacement vector, combine it with the unbalanced force vector in the stress analysis area, conduct iteration, update the displacement vector, obtain the updated displacement vector of each iteration, and predict the structural change information of the high pier of the bridge to be constructed; Among them, the specific calculation formula of the unbalanced force vector is: In the formula, represents the unbalanced force vector at the -th iteration, represents the load vector of the stress analysis region, represents the tangent stiffness matrix at the -th iteration, represents the updated displacement vector at the -th iteration; The specific calculation formula of the updated displacement vector is: In the formula, represents the updated displacement vector at the -th iteration, represents the updated displacement vector at the -th iteration, represents the tangent stiffness matrix at the -th iteration, represents the unbalanced force vector at the -th iteration.

2. The safety assessment method for the construction of high piers of bridges based on material stress analysis according to claim 1, characterized in that The determining the construction environment load specifically includes: Collect the meteorological data of the meteorological bureau where the bridge construction site is located, and determine the long-term meteorological fluctuation law of the area where the bridge construction site is located; Use a total station for topographic surveying to obtain the topographic information of the construction site and its surrounding areas; Establish a meteorological observation station according to the topographic information of the construction site and its surrounding areas; Generate construction weather prediction information according to the long-term meteorological fluctuation law of the area where the bridge construction site is located and the real-time construction environment information; Set up water level observation holes around the construction site and regularly record the water level data around the construction site; Obtain soil samples from the construction site and obtain the physical information of the soil at the construction site; Generate the permeability performance data of the soil according to the water level data around the construction site and the physical information of the soil at the construction site; Determine the height of the high pier of the bridge according to the bridge design scheme and obtain the wind load on the high pier of the bridge; Generate the predicted humidity of the soil at the construction site according to the construction weather prediction information and the water level data around the construction site, and combine the permeability performance data of the soil to obtain the soil load at the construction site; Collectively refer to the wind load on the high pier of the bridge and the soil load at the construction site as the construction environment load.

3. The safety assessment method for the construction of high piers of bridges based on material stress analysis according to claim 2, characterized in that, The determination of the dynamic safety index specifically includes: Classify the construction weather prediction information to generate meteorological element classification data; Classify the construction history records of high piers according to the meteorological element classification data to generate construction history data of the same meteorological elements; Classify the construction history data of the same meteorological elements according to the construction type to generate construction type meteorological element history data; Summarize the construction type meteorological element history data to summarize the environmental characteristic data corresponding to the suspension of construction for each construction type, denoted as the risk characteristic threshold; Generate a time-varying coefficient of meteorological construction risk according to the meteorological element classification data and the construction history records of high piers; Obtain the predicted time for the meteorological data to reach the risk characteristic threshold according to the construction weather prediction information; Accumulate the time-varying coefficient of meteorological construction risk according to the predicted time for the meteorological data to reach the risk characteristic threshold to generate a predicted risk value; Combine the terrain undulation characteristic data of each high pier construction and the risk characteristic thresholds of each construction type to establish a terrain risk characteristic parameter table; Retrieve the terrain risk characteristic parameter table according to the terrain information of the construction site and its surrounding areas, and obtain the risk characteristic threshold corresponding to the current construction terrain as the dynamic safety index.

4. A safety assessment method for the construction of high piers of bridges based on material stress analysis according to claim 3, characterized in that, The generation of the construction risk value specifically includes: Determine the real-time wind direction and wind speed of the high pier of the bridge according to the real-time construction environment information to generate the real-time wind load on the high pier of the bridge; Determine the wind load characteristic threshold and soil load characteristic threshold based on the terrain risk characteristic parameter table; Determine the wind direction and wind speed corresponding to the wind load characteristic threshold according to the wind load characteristic threshold, and combine the construction weather prediction information to obtain the predicted time for reaching the wind load characteristic threshold; Collect the current construction progress, and obtain the current construction progress according to the construction history records of high piers to generate a predicted completion time; Determine the corresponding humidity of the soil load characteristic threshold according to the soil load characteristic threshold; Combine the water level data around the construction site and the construction weather prediction information to obtain the predicted humidity time corresponding to reaching the soil load characteristic threshold; Combine the predicted time for reaching the wind load characteristic threshold, the predicted completion time, and the predicted humidity time corresponding to reaching the soil load characteristic threshold to generate a construction risk value; Among them, the specific calculation formula of the construction risk value is: In the formula, represents the construction risk value, represents the predicted risk value of soil load construction, represents the predicted risk value of wind load construction, represents the current construction progress, represents the natural constant, represents the predicted completion time, represents the corresponding humidity prediction time to reach the soil load characteristic threshold, represents the predicted time to reach the wind load characteristic threshold.

5. A safety assessment method for the construction of high piers of bridges based on material stress analysis according to claim 4, characterized in that, The setting of safety parameters according to the stress data of the high pier of the bridge and the structural change information of the high pier to be constructed specifically includes: Based on the stress analysis software, obtain the force vectors applied to each stress analysis area; Determine the unbalanced force norm according to the number of forces and the force vectors in the stress analysis area; Compare the unbalanced force norm and the unbalanced force vector, obtain the number of iterations when the unbalanced force norm is less than the unbalanced force vector, and record it as the final number of iterations; Determine the updated displacement vector of the final iteration according to the final number of iterations as the safety parameter; Among them, the specific calculation formula of the unbalanced force norm is: ； In the formula, represents the unbalanced force norm, represents the th force vector in the stress analysis region, represents the number of forces acting on the stress analysis region.

6. The safety assessment method for the construction of high piers of bridges based on material stress analysis according to claim 5, characterized in that The obtaining of the deviation degree of the high pier of the bridge specifically includes: Based on the stress analysis software, input the updated displacement vector of the final iteration to generate the maximum displacement threshold of each height of the high pier of the bridge; Taking the central axis of the high pier of the bridge as the reference and the center of the bottom surface of the high pier of the bridge as the coordinate origin, the high pier of the bridge is dissected by eight vertical sections passing through the center of the circle to generate sixteen groups of outer surface coordinate functions on the same horizontal plane. Every one meter in the vertical direction, obtain the outer surface plane coordinate function of the current high pier of the bridge; According to the bridge design scheme, obtain the expected height of the high pier of the bridge and the outer surface plane coordinate function corresponding to each expected height; Combining the maximum displacement threshold of each height of the bridge height, the outer surface plane coordinate function of the current high pier of the bridge, the outer surface plane coordinate function corresponding to each expected height, and the expected height of the high pier of the bridge, obtain the deviation degree of the high pier of the bridge; Among them, the specific calculation formula of the deviation degree of the high pier of the bridge is: In the formula, represents the deviation degree of the high pier of the bridge, represents the total number of collectable times of the expected outer surface plane coordinate function of the high pier of the bridge, represents the total number of collected times of the current outer surface plane coordinate function of the high pier of the bridge, represents the high pier of the bridge at the th time of collection of the expected outer surface plane coordinate function, represents the current outer surface plane coordinate function of the high pier of the bridge at the th time of collection, represents the high pier of the bridge at the th time of collection of the maximum displacement threshold corresponding to the height.

7. The safety assessment method for the construction of high piers of bridges based on material stress analysis according to claim 6, wherein The generation of the weather correction coefficient for the current construction project specifically includes: Combining the current construction progress of the high pier of the bridge and the high pier construction historical record, obtain the required weather environment and the allowable deviation range value of the construction environment for the current construction project; Set the weather parameter weight according to the required weather environment of the current construction project; Obtain the current construction environment information in the construction weather prediction information and record it as the weather prediction verification environment information; Combining the real-time construction environment information and the weather prediction verification environment information, obtain the weather parameter deviation value; Generate the weather correction coefficient according to the required weather environment of the current construction project and the weather parameter deviation value; Among them, the specific calculation formula of the weather correction coefficient is: In the formula, represents the weather correction coefficient, represents the weather parameter deviation value, represents the allowable deviation range value of the construction environment of the current construction project.

8. A safety assessment method for the construction of high piers of bridges based on material stress analysis according to claim 7, characterized in that, The evaluation of the construction safety level specifically includes: According to the high pier construction historical data of the same type of bridge design scheme, set the initial weight coefficients of the construction risk value, the deviation degree of the high pier of the bridge, and the weather correction coefficient of the current construction project; Adjust each initial weight coefficient according to the high pier construction terrain data to generate a comprehensive weight coefficient; Combining the construction risk value, the deviation degree of the high pier of the bridge, the weather correction coefficient of the current construction project, and the corresponding comprehensive weight coefficient, generate a safety evaluation value; Set the safety level demarcation value, compare the safety evaluation value with the safety level demarcation value, and evaluate the construction safety level.

9. A bridge high pier construction safety assessment system based on material stress analysis, characterized in that, A method for evaluating the construction safety of a high pier of a bridge based on material stress analysis according to any one of claims 1-8, including: A data acquisition module, which is used to collect the real-time environment information of the construction site through instruments and equipment, obtain the construction progress information of the current high pier of the bridge, and collect the high pier construction historical data of the same type of bridge design scheme; A data integration module, which is used to determine the construction environment load according to the real-time construction environment information and the construction weather prediction information, establish a topographic risk characteristic parameter table based on the historical data of high pier construction in the design scheme of the same type of bridge, determine the dynamic safety index, and determine the construction equipment load according to the equipment information used in the high pier construction of the bridge; A stress analysis module, which is used to calculate and analyze the material stress of the bridge high pier according to the stress analysis software, the input construction environment load, the construction equipment load and the material information used in the high pier construction of the bridge, and obtain the stress data of each part of the bridge high pier during construction; A historical data storage module, which is used to store the historical data of high pier construction in the design scheme of the same type of bridge, and provide data backtracking and trend analysis functions to provide reference for subsequent construction; A safety assessment module, which is used to generate an unbalanced force vector for each stress analysis area of the constructed bridge high pier by combining the elastic modulus, compressive strength, tensile strength, load conditions of the material and the stress analysis results; A risk warning module, which is used to analyze the real-time construction environment information in real time through the set safety parameters and construction risk values, judge whether there are potential safety hazards, and start early warning if necessary, stop construction.

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