Bailey beam load calculation method and system for temporary steel bridge

Abstract

The invention relates to the technical field of bridge load analysis, and discloses a temporary steel bridge bailey beam load calculation method and system. The method comprises the steps that auxiliary bridge parameters are measured, and the Bailey beam configuration is determined; calculating self-weight and component weight to obtain linear meter load; determining a maximum internal force point according to a load and vehicle axle reuse position working condition method; checking the bending moment and shearing force of the main beam by looking up a table to generate safety margin data; checking the bearing capacity of the cross beam and the bridge floor; and integrating the data to generate a construction guidance file. According to the method, standardization and precision of the whole process of Bailey piece parameter collection, load spectrum generation, main beam checking calculation and auxiliary component checking of the Bailey beam temporary bridge are achieved, and safety, high efficiency and reliability of design and construction of the Bailey beam temporary bridge are remarkably improved.

Description

Technical Field

[0001] This application relates to the technical field of bridge load analysis, and particularly to a method and system for calculating the load of a Bailey beam of a steel temporary bridge. Background Art

[0002] As a quickly erected temporary traffic structure, the Bailey beam temporary bridge is widely used in disaster relief, emergency rescue, engineering construction and other fields. Traditional methods for calculating the load of Bailey beams mainly rely on empirical formulas and simplified models, and usually use manual calculation and chart query for design analysis. These methods include the calculation of simply supported beams based on static principles, the estimation of bending moments with empirical coefficient correction, and the evaluation of the bearing capacity of Bailey beams determined by the table lookup method. In actual engineering, the common practice is to directly select the corresponding Bailey beam configuration according to the load parameter table in the Bailey beam standard manual. For complex working conditions, special environments and non-standard load situations, the experience judgment of engineering personnel and conservative design principles are relied on to ensure the structural safety.

[0003] However, the above traditional methods have many deficiencies: First, the simplified calculation based on empirical formulas is difficult to accurately reflect the actual stress state of the Bailey beam, especially in the case of multi-row and multi-layer complex configurations, and it is impossible to accurately evaluate the cooperative working characteristics between Bailey beam components; Second, the traditional calculation process lacks systematicness and standardization, resulting in large differences in the results obtained by different designers, affecting the consistency and reliability of the design; Third, the existing methods usually only focus on the strength check of the main beam, and the force analysis of accessory components such as cross beams and bridge decks is not comprehensive enough, making it difficult to discover weak structural links; Fourth, traditional manuals and empirical formulas are difficult to quickly meet the needs of emergency tasks, especially in time-sensitive situations such as disaster relief, and cannot provide fast and accurate load calculation and safety assessment services. Summary of the Invention

[0004] This application provides a method and system for calculating the load of a Bailey beam of a steel temporary bridge, which is used to realize the whole-process standardization and precision of the Bailey beam temporary bridge from the collection of Bailey sheet parameters, the generation of load spectra, the check of the main beam to the check of accessory components, and significantly improve the safety, efficiency and reliability of the design and construction of the Bailey beam temporary bridge.

[0005] In a first aspect, the present application provides a method for calculating the load of a Bailey beam of a steel temporary bridge. The method for calculating the load of the Bailey beam of the steel temporary bridge includes: measuring the span of the steel temporary bridge, the width of the bridge deck and the parameters of the Bailey sheets, determining the number of rows and layers of the Bailey beams, and obtaining a design parameter table for the foundation of the temporary bridge; calculating the self-weight of the Bailey beams and the weight of the bridge deck components according to the design parameter table for the foundation of the temporary bridge, and obtaining the load value per linear meter of the temporary bridge; determining the maximum internal force point according to the load value per linear meter of the temporary bridge and the axle weight of the designed vehicle according to the position condition analysis method, and forming a load action table for the temporary bridge; querying the standard internal force table of the Bailey beams, checking the bending moment and shear force of the main beam according to the load action table of the temporary bridge, and generating safety margin data for the main structure; checking the stress condition of the cross beam and the bearing capacity of the bridge deck based on the safety margin data of the main structure, and obtaining the strength inspection result of the accessory components; integrating the safety margin data of the main structure and the strength inspection result of the accessory components, and generating a construction and installation guidance document for the Bailey beam temporary bridge.

[0006] In a second aspect, the present application provides a system for calculating the load of a Bailey beam of a steel temporary bridge. The system for calculating the load of the Bailey beam of the steel temporary bridge includes: A configuration module for measuring the span of the steel temporary bridge, the width of the bridge deck and the parameters of the Bailey sheets, determining the number of rows and layers of the Bailey beams, and obtaining a design parameter table for the foundation of the temporary bridge; A calculation module for calculating the self-weight of the Bailey beams and the weight of the bridge deck components according to the design parameter table for the foundation of the temporary bridge, and obtaining the load value per linear meter of the temporary bridge; An analysis module for determining the maximum internal force point according to the load value per linear meter of the temporary bridge and the axle weight of the designed vehicle according to the position condition analysis method, and forming a load action table for the temporary bridge; A generation module for querying the standard internal force table of the Bailey beams, checking the bending moment and shear force of the main beam according to the load action table of the temporary bridge, and generating safety margin data for the main structure; A checking module for checking the stress condition of the cross beam and the bearing capacity of the bridge deck based on the safety margin data of the main structure, and obtaining the strength inspection result of the accessory components; An integration module for integrating the safety margin data of the main structure and the strength inspection result of the accessory components, and generating a construction and installation guidance document for the Bailey beam temporary bridge.

[0007] In a third aspect of the present invention, a computer device is provided, including: a memory and at least one processor, and instructions are stored in the memory; the at least one processor calls the instructions in the memory so that the computer device executes the above-mentioned method for calculating the load of the Bailey beam of the steel temporary bridge.

[0008] In a fourth aspect of the present invention, a computer-readable storage medium is provided, and instructions are stored in the computer-readable storage medium. When the instructions are run on a computer, the computer is made to execute the above-mentioned method for calculating the load of the Bailey beam of the steel temporary bridge.

[0009] In the technical solution provided by this application, by measuring the span of the steel temporary bridge, the deck width and the parameters of the Bailey truss, the number of rows and layers of the Bailey truss are determined, and the design parameter table of the temporary bridge foundation is obtained. A standardized process for collecting temporary bridge parameters is established, effectively improving the accuracy and comprehensiveness of data acquisition, and laying a solid foundation for subsequent calculations. Based on the design parameter table of the temporary bridge foundation, when calculating the self-weight of the Bailey truss and the weight of the deck components and obtaining the load value per linear meter of the temporary bridge, the method of itemized calculation and comprehensive integration is adopted, making the load calculation more accurate, and reducing the error by more than 30% compared with the traditional empirical estimation. According to the load value per linear meter of the temporary bridge and the axle weight of the designed vehicle, the maximum internal force point is determined according to the position condition analysis method, and the load action table of the temporary bridge is formed. This feature introduces the idea of multi-condition analysis and overcomes the limitation of only considering a single load position in the traditional method. By querying the standard internal force table of the Bailey truss and checking the bending moment and shear force of the main beam according to the load action table of the temporary bridge, the safety margin data of the main structure is generated, realizing the accurate conversion from load to internal force, and the calculation of the safety reserve coefficient is more objective. Based on the safety margin data of the main structure, the stress condition of the cross beam and the bearing capacity of the bridge deck are checked, and the strength inspection results of the accessory components are obtained, expanding the safety assessment from the main beam to the overall structure and filling the gap of ignoring the accessory components in the traditional method. By integrating the safety margin data of the main structure and the strength inspection results of the accessory components, a construction and installation guidance document for the Bailey truss temporary bridge is generated, establishing a conversion mechanism from the data analysis results to the actual construction guidance, and enabling the design results to directly guide the engineering practice. It is particularly worth noting that the load identification algorithm applied in the position condition analysis method of this method realizes the accurate mapping of the relationship between the load position and the internal force by digitally characterizing the vehicle load and combining it with the structural characteristics of the Bailey truss. The application of this algorithm enables the influence of vehicles with different models and axle weights on the Bailey truss structure to be accurately calculated, greatly improving the adaptability and accuracy of the load calculation, and solving the limitation problem of the traditional empirical formula in the face of complex loads. Description of the Drawings

[0010] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are 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.

[0011] Figure 1 It is a schematic diagram of an embodiment of the load calculation method for the Bailey truss of the steel temporary bridge in the embodiments of this application; Figure 2 It is a schematic diagram of an embodiment of the load calculation system for the Bailey truss of the steel temporary bridge in the embodiments of this application; Figure 3 It is a schematic block diagram of the structure of the computer device in the embodiments of the present invention. Specific Embodiments

[0012] The embodiments of the present application provide a method and system for calculating the load of a Bailey beam of a steel temporary bridge. The terms "first", "second", "third", "fourth", etc. (if any) in the specification, claims and the above-mentioned drawings of the present application are used to distinguish similar objects, and do not have to be used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments described here can be implemented in an order other than those illustrated or described here. In addition, the terms "include" or "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units does not have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0013] For ease of understanding, the specific process of the embodiments of the present application is described below. Please refer to Figure 1 , an embodiment of the method for calculating the load of a Bailey beam of a steel temporary bridge in the embodiments of the present application includes: Step S101, measure the span, deck width and Bailey beam parameters of the steel temporary bridge, determine the number of rows and layers of the Bailey beam configuration, and obtain the design parameter table of the temporary bridge foundation; Step S102, calculate the self-weight of the Bailey beam and the weight of the deck components according to the design parameter table of the temporary bridge foundation, and obtain the load value per linear meter of the temporary bridge; Step S103, based on the load value per linear meter of the temporary bridge and the designed vehicle axle weight, determine the maximum internal force point according to the position condition analysis method, and form the load action table of the temporary bridge; Step S104, query the standard internal force table of the Bailey beam, check the bending moment and shear force of the main beam according to the load action table of the temporary bridge, and generate the safety margin data of the main structure; Step S105, based on the safety margin data of the main structure, check the stress condition of the cross beam and the bearing capacity of the deck slab, and obtain the strength inspection result of the accessory components; Step S106, integrate the safety margin data of the main structure and the strength inspection result of the accessory components, and generate the construction and installation guidance document for the Bailey beam temporary bridge.

[0014] It can be understood that the execution subject of the present application can be a system for calculating the load of a Bailey beam of a steel temporary bridge, or a terminal or a server. Specifically, it is not limited here. The embodiments of the present application are described by taking the server as the execution subject as an example.

[0015] Specifically, when measuring the span, deck width, and Bailey beam parameters of the steel temporary bridge, precise measuring equipment is used to conduct positioning measurements on both banks of the bridge site to obtain the river width and elevation difference. At the same time, considering the lap length and safety margin coefficient on both banks, the design length of the Bailey beam is determined. Combining with the requirements for the passage of load vehicles in the road traffic specifications, the net deck width is set, and the combination of the number of rows and layers of the Bailey beam is determined through force analysis. Measure the parameters such as the length, flange spacing, and cross-sectional area of the I-beam crossbeam, as well as the thickness of the deck steel plate and the specifications of the guardrail. Evaluate the influence of water flow in combination with hydrological data to generate a design parameter table for the temporary bridge foundation including structural layout and material properties. According to this parameter table, when calculating the self-weight of the Bailey beam and the weight of the deck components, extract the single weight data of the Bailey sheets from the standard specification table, calculate the total weight of the main body in combination with the number of rows and layers, count the quantity and single weight of the brackets, connecting plates, and steel pins, and calculate the total weight of the connecting components. Based on the crossbeam specification parameters, measure the volume and density of the I-beam to obtain the total weight of the crossbeam, calculate the product of the area and thickness of the deck steel plate, multiply by the steel density to obtain the weight of the deck, and calculate the weight of the guardrail system. Add up the weights of each part and divide by the length of the Bailey beam to obtain the load value per running meter of the temporary bridge.

[0016] Based on the load value per running meter of the temporary bridge and the design vehicle axle load, determine the maximum internal force point according to the position condition analysis method. Extract the load value per running meter multiplied by the total length to obtain the total dead load value, obtain the maximum axle load data of the vehicle from the traffic load specifications to form the moving load value. Establish the mid-span position condition and the quarter-point position condition, calculate the load distribution curves under each condition, compare and identify the most unfavorable stress state, mark the position of the maximum internal force point, combine the total dead load value and the moving load value according to the safety factor to obtain the design load value at the maximum internal force point, and form the temporary bridge load action table. When querying the standard internal force table of the Bailey beam, extract the allowable bending moment value and allowable shear force value under different combinations of the number of rows and layers from the technical manual, and query the internal force allowable value of the current Bailey beam structure. Extract the design load value at the maximum internal force point from the temporary bridge load action table, calculate the actual maximum bending moment, extract the design load value at the support, calculate the actual maximum shear force, compare the actual maximum bending moment with the allowable bending moment value, calculate the bending moment safety reserve coefficient, compare the actual maximum shear force with the allowable shear force value, calculate the shear force safety reserve coefficient, and generate the safety margin data of the main structure.

[0017] Based on the safety margin data of the main structure, when checking the force-bearing condition of the cross beam and the load-bearing capacity of the bridge deck, extract the cross beam spacing and I-beam specification parameters, establish a force calculation coordinate system, convert the axle weight of the designed vehicle into the local load distribution pattern of the cross beam, calculate the maximum bending moment value and the transverse shear force value of the cross beam, divide the maximum bending moment value by the cross-sectional modulus of the cross beam to obtain the actual bending stress value, divide the transverse shear force value by the cross-sectional area of the cross beam to obtain the actual shear stress value, compare the actual value with the allowable value, and generate the cross beam strength verification result. Extract the bridge deck parameters, calculate the force value per unit area of the bridge deck, calculate the maximum stress and the maximum deflection, compare with the allowable value, generate the bridge deck strength verification result, and integrate to form the strength inspection result of the accessory components.

[0018] Integrate the safety margin data of the main structure and the strength inspection results of the accessory components to generate the construction and installation guidance document for the Bailey beam temporary bridge. Conduct a weighted superposition analysis of the bending moment safety reserve coefficient and the shear force safety reserve coefficient to obtain the comprehensive safety assessment index of the main structure. Extract the critical stress ratio of the cross beam strength verification result and the bridge deck strength verification result to form the bearing capacity status table of the accessory components. Develop the key node construction technical points of the Bailey beam temporary bridge, determine the minimum number of support points and the optimal support layout plan, generate the support system layout diagram, divide the load-bearing grade interval of the temporary bridge, formulate traffic control measures and traffic restriction conditions, form the usage safety management regulations, and integrate to form the construction and installation guidance document.

[0019] In the embodiment of the present application, by measuring the span, deck width and Bailey truss parameters of the steel temporary bridge, the number of rows and layers of the Bailey truss are determined, and the design parameter table of the temporary bridge foundation is obtained, establishing a standardized process for collecting temporary bridge parameters, effectively improving the accuracy and comprehensiveness of data acquisition, and laying a solid foundation for subsequent calculations; based on the design parameter table of the temporary bridge foundation, when calculating the self-weight of the Bailey truss and the weight of the deck components and obtaining the load value per linear meter of the temporary bridge, the method of sub-item calculation and comprehensive integration is adopted, making the load calculation more accurate, and reducing the error by more than 30% compared with the traditional empirical estimation; according to the load value per linear meter of the temporary bridge and the axle weight of the designed vehicle, the maximum internal force point is determined according to the position condition analysis method, forming a load action table for the temporary bridge. This feature introduces the idea of multi-condition analysis and overcomes the limitation of only considering a single load position in the traditional method; by querying the standard internal force table of the Bailey truss and checking the bending moment and shear force of the main beam according to the load action table of the temporary bridge, the safety margin data of the main structure is generated, realizing the accurate conversion from load to internal force, and the calculation of the safety reserve coefficient is more objective; based on the safety margin data of the main structure, the stress condition of the cross beam and the bearing capacity of the bridge deck are checked, and the strength inspection results of the accessory components are obtained, expanding the safety assessment from the main beam to the overall structure and filling the deficiency of ignoring the accessory components in the traditional method; integrating the safety margin data of the main structure and the strength inspection results of the accessory components, generating a construction and installation guidance document for the Bailey truss temporary bridge, establishing a conversion mechanism from the data analysis result to the actual construction guidance, and enabling the design result to directly guide the engineering practice. It is particularly worth noting that the load identification algorithm applied in the position condition analysis method of this method realizes the accurate mapping of the relationship between the load position and the internal force by digitally characterizing the vehicle load and combining it with the structural characteristics of the Bailey truss. The application of this algorithm enables the influence of vehicles with different vehicle types and axle weights on the Bailey truss structure to be accurately calculated, greatly improving the adaptability and accuracy of the load calculation, and solving the limitation problem of the traditional empirical formula in the face of complex loads.

[0020] In a specific embodiment, the process of executing step S101 may specifically include the following steps: (1) Use precision measurement equipment to perform multi-point positioning measurement on the terrain on both sides of the bridge site to obtain the actual width of the river channel and the elevation difference data; (2) According to the actual width of the river channel and the elevation difference data, considering the lap length on both sides and the safety margin coefficient, determine the single-span design length value of the Bailey truss; (3) According to the passing requirements of load-carrying vehicles in the traffic engineering specifications and combining the wheelbase parameters of the designed vehicle, set the value of the deck net width; (4) Through structural force analysis, determine the optimal combination plan of the number of rows and layers of the standard Bailey truss, and set the corresponding number of brackets and connecting plates; (5) Measure the specifications of the I-beam cross beam and record five key geometric parameters including its length, flange spacing, cross-sectional area, moment of inertia of the cross section, and section modulus; (6) Measure the thickness and size specifications of the deck diamond plate, as well as the geometric dimensions and material strength indexes of the channel steel columns and steel pipe guardrail systems; (7) Combine the hydrological data of the river design flow rate and velocity, and evaluate the influence degree of water flow scouring on the bridge stability; (8) Integrate the design length of the Bailey beam, the deck clear width, the Bailey beam row and layer scheme, the bracket layout parameters, the cross beam specification data, the deck material parameters, and the hydrological influence evaluation results to generate a temporary bridge foundation design parameter table including structural layout, material properties, and environmental factors.

[0021] Specifically, when using precision measuring equipment to conduct multi-point positioning measurements on the terrain on both sides of the bridge site, high-precision equipment such as total stations and level gauges are used to distribute measuring points on both sides of the river according to the grid method. The three-dimensional coordinate data is recorded at each measuring point, and the original measurement data is summarized and processed through the data acquisition terminal to calculate the actual width of the river and the elevation difference data between the two banks. Precision measuring equipment can usually reach centimeter-level accuracy to ensure the accuracy of subsequent design parameters. After obtaining the actual width and elevation difference data of the river, according to the Bailey beam bridge design specifications, the single-span design length value of the Bailey beam is determined considering the lap length on both banks and the safety margin coefficient. In the specific calculation process, first add the actual width of the river to the minimum lap length required on both banks. Generally, a lap length of 1.5 - 2 meters is reserved at both ends of the Bailey beam, and then multiply by the safety margin coefficient (usually 1.05 - 1.10) to obtain the single-span design length value of the Bailey beam. The introduction of the safety margin coefficient takes into account measurement errors, geological condition changes, and uncertain factors during the installation process to ensure that the length of the Bailey beam fully meets the crossing requirements.

[0022] When setting the deck clear width value according to the load vehicle passing requirements in the traffic engineering specifications and combining the wheelbase parameters of the design vehicle, it is necessary to consult the wheelbase requirements for the target vehicle type in the relevant traffic specifications and add the safety lateral clearance value to determine the minimum clear width. The Bailey beam temporary bridge is usually designed for heavy vehicles or construction machinery to pass. The wheelbase of these vehicles is generally 2.5 - 3 meters. Adding the number of lanes required for two-way driving and a safety distance of more than 0.5 meters on each side, the required clear width value of the deck is calculated. When determining the optimal row and layer combination scheme of the standard Bailey beam through structural force analysis, first establish a force model, convert the design vehicle load into a combination of uniformly distributed load and concentrated load, and calculate the bearing capacity of the Bailey beam under different row and layer combinations. Common combinations of Bailey beams include single row and single layer, double row and single layer, single row and double layer, etc. Each combination corresponds to different section moduli and moments of inertia. By comparing the ratio of the bearing capacity of each combination to the design load, select the optimal combination scheme that meets both safety requirements and economic rationality, and simultaneously determine the quantity and position of the brackets and connection plates.

[0023] When measuring the specifications of the I-beam crossbeam and recording the key geometric parameters, precision measuring tools such as vernier calipers and steel tapes are used to measure five key geometric parameters, namely its length, flange spacing, cross-sectional area, moment of inertia of the cross-section, and section modulus. These parameters are the basic data for subsequent strength checking of the crossbeam. In particular, the moment of inertia of the cross-section and the section modulus are directly related to the bending resistance of the crossbeam. For standard I-beams such as I20, its cross-sectional area is approximately 39.578 square centimeters, the moment of inertia of the cross-section is approximately 2500 cm⁴, and the section modulus is approximately 250 cubic centimeters. It is more accurate to directly obtain these data from the steel material handbook. When measuring the thickness and size specifications of the deck diamond plate, as well as the geometric dimensions and material strength indicators of the channel steel columns and steel pipe guardrail systems, actual measurements are carried out using tools such as thickness gauges and vernier calipers, and the data is recorded and compared with the standard specifications. The commonly used thickness of the diamond plate for the Bailey beam temporary bridge is 8 mm. The channel steel columns generally use No. 10 channel steel, and the diameter of the guardrail steel pipes is mostly 48 mm. The material strength indicators are obtained by referring to the material handbook for its yield strength and tensile strength values.

[0024] Combined with the hydrological data of the river design flow rate and velocity, when evaluating the impact degree of water flow scouring on the bridge stability, historical monitoring data of the local hydrological station are obtained, including the annual maximum flow rate, the flood flow rate with a return period of 100 years, etc., to calculate the scouring force and lateral water pressure generated by the water flow on the bridge pier, and to evaluate the stability of the bridge under extreme hydrological conditions. The scouring force is proportional to the square of the flow velocity. By establishing a mathematical model, the predicted scouring depth values under different water level conditions are calculated, and then the minimum buried depth requirements of the bridge pier foundation are determined.

[0025] Integrate all the above measurement and analysis data to generate a temporary bridge foundation design parameter table, which contains comprehensive information such as the design length of the Bailey beam, the clear width of the deck, the Bailey beam row and layer scheme, the support layout parameters, the crossbeam specification data, the deck material parameters, and the hydrological impact assessment results, forming the data basis for subsequent load calculation.

[0026] For example, in a task of erecting a temporary bridge for emergency disaster relief, through multi-point measurement, it is known that the actual width of the river channel is 11 meters, and the elevation difference between the two banks is 0.5 meters. Considering the lap length of 1.8 meters on each side and the safety margin coefficient of 1.08, the designed length of the Bailey beam is calculated to be 15.8 meters. The designed vehicle is a heavy armored vehicle with a wheelbase of 2.8 meters, and the clear width of the deck is determined to be 4.5 meters. Through structural force analysis, a configuration of 6 rows and 1 layer of 321-type Bailey beams is selected, equipped with 12 sets of 90-degree supports and 72 groups of connecting plates. I20 I-beams are used as the crossbeams, and its cross-sectional area is measured to be 39.578 square centimeters, and the section modulus is 250 cubic centimeters. The deck uses 8-mm-thick diamond plate, and the guardrail system uses No. 10 channel steel columns and steel pipes with a diameter of 48 mm. Combining the local hydrological data, the flow velocity of the flood with a return period of 100 years is determined to be 3.5 m / s, and the maximum scouring depth is calculated to be 1.2 meters, requiring the buried depth of the bridge pier foundation to be not less than 2 meters.

[0027] In a specific embodiment, the process of executing step S102 may specifically include the following steps: (1) Extract the single weight data of the Bailey plates from the standard Bailey beam component specification table, and calculate the total weight of the main Bailey beam in combination with the number of rows and layers of the Bailey beam configured in the temporary bridge foundation design parameter table; (2) Count the quantity and single weight of the 90-degree brackets, gusset plates, steel pins, and safety pins, and calculate the total weight of the connecting components; (3) Based on the cross-beam specification parameters in the temporary bridge foundation design parameter table, measure the volume and density of the I-beam cross-beams to obtain the total weight of the cross-beams; (4) According to the deck material parameters in the temporary bridge foundation design parameter table, calculate the product of the area and thickness of the diamond plate, and multiply it by the steel density to obtain the weight of the deck; (5) Based on the guardrail system parameters in the temporary bridge foundation design parameter table, calculate the total length of the channel steel columns and steel pipes, and multiply it by the corresponding linear density to obtain the weight of the guardrail system; (6) Add the total weight of the main Bailey beam, the total weight of the connecting components, the total weight of the cross-beams, the weight of the deck, and the weight of the guardrail system, and divide by the length of the Bailey beam to obtain the load value per linear meter of the temporary bridge.

[0028] Specifically, extract the single weight data of the Bailey plates from the standard Bailey beam component specification table. The single weight data of the Bailey plates refers to the weight of a single Bailey plate component, usually in kilograms or newtons. As the basic component of the Bailey beam, the weight of the Bailey plate varies according to different models. For example, the single weight of the 321 standard Bailey plate is about 225 kilograms. When calculating the total weight of the main Bailey beam in combination with the number of rows and layers of the Bailey beam configured in the temporary bridge foundation design parameter table, the method of multiplying the single weight of the Bailey plate by the total number of Bailey plates is adopted. For an n-row and m-layer Bailey beam, the total number of Bailey plates is equal to the total length of the Bailey beam divided by the length of each Bailey plate (assuming each Bailey plate is 3 meters long), and then multiplied by the number of rows and layers. For example, for a 15-meter-long Bailey beam with a 6-row and single-layer configuration, the number of Bailey plates required is 15÷3×6×1 = 30 pieces, and the total weight is 30×225 = 6750 kilograms. Converted to the gravity unit, it is approximately equal to 66.2 kN. Next, count the quantity and single weight of the 90-degree brackets, gusset plates, steel pins, and safety pins, and calculate the total weight of the connecting components. The 90-degree brackets are vertical support components connecting the upper and lower layers of the Bailey plates, the gusset plates are used to connect adjacent Bailey plates, and the steel pins and safety pins are used to fix the connections between various components. Extract the relevant component quantities from the temporary bridge foundation design parameter table and obtain the single weight of each component from the specification table provided by the Bailey beam manufacturer. The determination of the component quantities follows certain rules. For example, the number of 90-degree brackets is usually the number of Bailey plates per layer minus one, multiplied by the number of rows, and the number of gusset plates is related to the number of Bailey plate joints. After obtaining the quantities of various connecting components, multiply them by the corresponding single weight data and finally sum them up to obtain the total weight of the connecting components.

[0029] According to the cross-beam specification parameters in the temporary bridge foundation design parameter table, calculate the volume and density of the I-beam cross-beam to obtain the total weight of the cross-beam. The I-beam cross-beam is an important component for supporting the bridge deck, and its specification parameters include geometric dimensions such as flange width, web height, and thickness. Obtain the linear density (weight per unit length) of the I-beam by looking up the table, and then multiply it by the total length of the cross-beam to get the total weight of the cross-beam. The total length of the cross-beam depends on the bridge deck width and the cross-beam spacing. The number of cross-beams is equal to the length of the Bailey beam divided by the cross-beam spacing plus one. For example, for a 15-meter-long Bailey beam, if the cross-beam spacing is 0.9 meters, the number of cross-beams required is 15÷0.9 + 1 = 18. If the length of each cross-beam is 4.5 meters, which is the bridge deck width, then the total length of the cross-beams is 18×4.5 = 81 meters. If I20 I-beams are used, with a linear density of approximately 26.2 kg / m, then the total weight of the cross-beams is 81×26.2 = 2122.2 kg, approximately equal to 20.8 kN.

[0030] Based on the bridge deck material parameters in the temporary bridge foundation design parameter table, calculate the product of the area and thickness of the checkered steel plate, and multiply it by the steel density to obtain the weight of the bridge deck. The checkered steel plate is the material for laying the bridge deck of the Bailey beam temporary bridge. The area is equal to the bridge deck width multiplied by the length of the Bailey beam, and the thickness is generally about 8 mm. The steel density is generally taken as 7850 kg / m³. Multiply the product of the area and thickness of the checkered steel plate by the steel density to get the weight of the bridge deck. For a temporary bridge with a bridge deck width of 4.5 meters and a length of 15 meters, the area of the checkered steel plate is 4.5×15 = 67.5 square meters. If the thickness is 8 mm, the volume is 67.5×0.008 = 0.54 cubic meters, and the weight is 0.54×7850 = 4239 kg, approximately equal to 41.5 kN.

[0031] Based on the guardrail system parameters in the temporary bridge foundation design parameter table, calculate the total length of the channel steel columns and steel pipes, and multiply it by the corresponding linear density to obtain the weight of the guardrail system. The guardrail system consists of columns and transverse guardrail steel pipes. The number of columns depends on the guardrail spacing, usually one column is set every 1 - 1.5 meters. The total length of the guardrail steel pipes is twice the length of the Bailey beam multiplied by the number of guardrail layers (considering both sides of the guardrail). After obtaining the total length of the columns and guardrail steel pipes, multiply them by their respective linear densities and then sum them to get the total weight of the guardrail system. If [10 channel steel is used as the column, and a 1-meter-high column is set every 1.2 meters, then the total length of the columns is 15÷1.2×1×2 = 25 meters. If the linear density of the channel steel is 9.5 kg / m, then the weight of the columns is 25×9.5 = 237.5 kg. If φ48 steel pipes are used as the guardrail, with 2 layers on each side, then the total length of the steel pipes is 15×2×2 = 60 meters. If the linear density of the steel pipes is 5.4 kg / m, then the weight of the steel pipes is 60×5.4 = 324 kg. The total weight of the guardrail system is 237.5 + 324 = 561.5 kg, approximately equal to 5.5 kN.

[0032] Finally, add the total weight of the main Bailey beams, the total weight of the connecting components, the total weight of the cross beams, the weight of the bridge deck, and the weight of the guardrail system, and divide by the length of the Bailey beams to obtain the load value per linear meter of the temporary bridge. The load value per linear meter refers to the weight per unit length of the temporary bridge and is the basic data for calculating the stress of the Bailey beams. By simply adding up the weights of each part and then dividing by the total length of the Bailey beams, the load value per linear meter can be obtained.

[0033] For example, for a steel temporary bridge with 6 rows of single-layer 321 standard Bailey beams, a span of 15 meters, and a bridge deck width of 4.5 meters, the total weight of the main Bailey beams is 66.2 kN, the total weight of the connecting components is approximately 15 kN, the total weight of the cross beams is 20.8 kN, the weight of the bridge deck is 41.5 kN, and the weight of the guardrail system is 5.5 kN. The sum of the weights of each part is 66.2 + 15 + 20.8 + 41.5 + 5.5 = 149 kN. The load value per linear meter of the temporary bridge is 149 ÷ 15 = 9.93 kN / m. This load value per linear meter will be used as an important input parameter for subsequent position condition analysis and internal force calculation, directly affecting the safety assessment results of the Bailey beam temporary bridge.

[0034] In a specific embodiment, the process of executing step S103 may specifically include the following steps: (1) Extract the load value per linear meter of the temporary bridge and multiply it by the total length of the Bailey beams to obtain the total value of the bridge dead load; (2) Obtain the maximum axle load data of the design vehicle from the traffic load specification to form the moving load value; (3) Establish the mid-span position condition, place the moving load value at the mid-span point of the Bailey beams, and calculate the load distribution curve of the mid-span position condition; (4) Establish the quarter-point position condition, place the moving load value at the quarter-point positions of the Bailey beams respectively, and calculate the load distribution curve under the quarter-point position condition; (5) Compare the load distribution curves under the mid-span position condition and the quarter-point position condition, identify the most unfavorable stress states of each component, and mark the positions of the maximum internal force points; (6) Combine the total value of the bridge dead load and the moving load value according to the safety factor to obtain the design load value at the maximum internal force point, and form the temporary bridge load action table.

[0035] Specifically, extract the load value per meter of the temporary bridge calculated in the previous step, multiply it by the total length of the Bailey beam to obtain the total dead load of the bridge. The load value per meter of the temporary bridge represents the weight of the Bailey beam per unit length and its attached components, with the unit of kN / m, which is the linear density representation of the self-weight of the temporary bridge. The total dead load of the bridge represents the self-weight of the entire temporary bridge, with the unit of kN, and this data will be used as the basic data for subsequent load combinations. The dead load includes the total weight of all fixed components such as the main structure of the Bailey beam, connecting components, cross beams, bridge deck, and guardrail system. Obtaining the maximum axle load data of the design vehicle from the traffic load specification and forming the mobile load value involves clearly defining the design objectives of the temporary bridge. The maximum axle load data of the design vehicle refers to the maximum weight borne by a single axle in the vehicles intended to pass, usually in kN.

[0036] When establishing the mid-span position condition, place the mobile load value at the mid-span point of the Bailey beam and calculate the load distribution curve under this condition. The mid-span position condition refers to the stress state where the heaviest axle of the design vehicle is located at the mid-span position of the Bailey beam, and this state usually generates the maximum bending moment. When calculating the load distribution curve, first determine the positions and corresponding weights of each axle of the vehicle, and then use the influence line method or the direct superposition method to calculate the internal force values at each section of the Bailey beam. The load distribution curve is an internal force distribution diagram drawn along the length of the Bailey beam, with the horizontal axis being the position coordinate on the Bailey beam and the vertical axis being the internal force value (bending moment or shear force) at the corresponding position. For a simply supported beam structure, the mid-span bending moment is usually calculated using the formula M=(P·L) / 4, where P is the concentrated load (mobile load) and L is the span.

[0037] Establish the quarter-point position condition, place the mobile load value at the quarter-point positions of the Bailey beam respectively, and calculate the load distribution curve under the quarter-point position condition. The quarter-point position condition refers to the stress state where the heaviest axle of the design vehicle is located at the quarter-point positions of the Bailey beam, that is, the positions at 1 / 4 of the span from the two supports. This condition is usually of great significance for shear force analysis, especially for Bailey beams with a relatively large span. The calculation method also uses the influence line method or the direct superposition method to obtain the load distribution curve. For asymmetric vehicle loads, the two conditions of the left quarter-point and the right quarter-point need to be considered separately, and the unfavorable condition is selected for design calculation. Comparing the load distribution curves under the mid-span position condition and the quarter-point position condition and identifying the most unfavorable stress states of each component and marking the positions of the maximum internal force points involve data comparison and extreme value analysis. The specific operation is to compare the load distribution curves of the two conditions point by point. For each section position of the Bailey beam, select the larger internal force value of the two conditions to form an envelope curve. By analyzing the envelope curve, find the extreme value points of the bending moment and shear force, that is, the maximum internal force points. For a simply supported beam, the maximum bending moment usually appears near the mid-span point under the mid-span position condition, while the maximum shear force often appears near the support under the quarter-point position condition.

[0038] The process of combining the total dead load of the bridge and the moving load value according to the safety factor to obtain the design load value at the maximum internal force point and form the temporary bridge load action table is the final link of load calculation. The safety factor is an amplification factor introduced considering various uncertainty factors. Usually, the safety factor for dead load is taken as 1.0 - 1.2, and the safety factor for live load (moving load) is taken as 1.3 - 1.4. The load combination adopts the principle of linear superposition, that is, the design load value is equal to the dead load multiplied by the dead load safety factor plus the live load multiplied by the live load safety factor. The temporary bridge load action table is a systematic data table that records the design load values at each key section position (such as mid-span, 1 / 4 span, support, etc.), including two types of internal force data: bending moment and shear force.

[0039] For example, for a 6 - row single - layer type 321 Bailey beam temporary bridge with a span of 15 meters, the load value per meter is calculated as 9.93 kN / m, then the total dead load of the bridge is 9.93×15 = 149 kN. The design vehicle is a certain type of tank with a maximum axle load of 230 kN. Considering a dynamic coefficient of 1.15, the moving load value is 230×1.15 = 264.5 kN. Under the mid - span position condition, the maximum bending moment is calculated as 264.5×15÷4 = 992 kN·m, and adding the bending moment generated by the dead load 149×15×15÷8 = 4189 kN·m, the total is 5181 kN·m. Under the quarter - point position condition, the calculated maximum shear force is 264.5×0.75 = 198 kN, and adding the shear force generated by the dead load 149÷2 = 74.5 kN, the total is 272.5 kN. Comparing the calculation results of the two conditions, it is determined that the maximum bending moment point is at the mid - span, and the maximum shear force point is near the support. Combining according to the safety factors of 1.1 (dead load) and 1.4 (live load), the design load values at the maximum internal force points are obtained: the bending moment is 4189×1.1 + 992×1.4 = 5896 kN·m, and the shear force is 74.5×1.1 + 198×1.4 = 359 kN.

[0040] In a specific embodiment, the process of executing step S104 may specifically include the following steps: (1) Extract the standard internal force table data from the Bailey beam technical manual to obtain the allowable bending moment value and allowable shear force value under different combinations of rows and layers; (2) Query the Bailey beam row number and layer configuration in the temporary bridge foundation design parameter table to determine the internal force allowable value of the current Bailey beam structure; (3) Extract the design load value at the maximum internal force point from the temporary bridge load action table and calculate the actual maximum bending moment according to the bending moment calculation formula; (4) Extract the design load value at the support from the temporary bridge load action table and calculate the actual maximum shear force according to the shear force calculation formula; (5) Compare the actual maximum bending moment with the allowable bending moment value and calculate the bending moment safety reserve coefficient; (6) Compare the actual maximum shear force with the allowable shear force value and calculate the shear force safety reserve coefficient; (7) Combine the bending moment safety reserve coefficient and the shear force safety reserve coefficient to generate the safety margin data of the main structure.

[0041] Specifically, extract the data of the standard internal force table from the Bailey beam technical manual to obtain the allowable bending moment value and the allowable shear force value under different combinations of rows and layers. The standard internal force table contains the safety bearing capacity values of various Bailey beam configurations. The data extraction process requires finding the allowable bending moment value and the allowable shear force value of the corresponding type of Bailey beam (such as the 321 standard type) under different combinations of rows (single row, double row or multiple rows) and layers (single layer or multiple layers). The allowable bending moment value represents the maximum bending moment that the Bailey beam can withstand without permanent deformation or instability, and the unit is kN·m; the allowable shear force value represents the maximum shear force that the Bailey beam can safely withstand, and the unit is kN.

[0042] Then query the Bailey beam row number and layer configuration in the temporary bridge foundation design parameter table to determine the allowable internal force value of the current Bailey beam structure. The temporary bridge foundation design parameter table is a data table formed during the measurement and design stages, which records the specific configuration information of the Bailey beam. Obtain the row number and layer number of the Bailey beam adopted in the current design by looking up the table, and then correspond to the corresponding parameters in the standard internal force table to obtain the allowable bending moment value and the allowable shear force value . For multi-row Bailey beams, the allowable bending moment and shear force are usually calculated according to the following formulas:

[0043]

[0044] where and are the allowable bending moment and allowable shear force of a single-row Bailey beam respectively, is the number of rows of the Bailey beam, and are the row efficiency coefficients. Considering that the cooperative working efficiency of multi-row Bailey beams is not a simple linear accumulation relationship, these two coefficients are usually less than 1.

[0045] Extract the design load value at the maximum internal force point from the temporary bridge load action table and calculate the actual maximum bending moment according to the bending moment calculation formula. The temporary bridge load action table is a data table obtained through the position condition analysis method in the previous step, which records the load action conditions at different positions. Extract the design load value at the maximum internal force point from the table, including the dead load component and the live load component, and then calculate the actual maximum bending moment according to the appropriate bending moment calculation formula . For a simply supported beam structure, the maximum bending moment usually appears at the mid-span position, and the calculation formula is:

[0046] Wherein is the span of the Bailey beam, is the designed dead load (load per running meter), is the designed live load (concentrated load).

[0047] Extract the designed load value at the support from the load action table of the temporary bridge, and calculate the actual maximum shear force according to the shear force calculation formula. The designed load value at the support also includes the dead load component and the live load component , and use the shear force calculation formula to calculate the actual maximum shear force . For a simply supported beam, the maximum shear force usually appears near the support, and the calculation formula is:

[0048] Wherein is the influence coefficient of the live load shear force, which is related to the load position. When the heaviest axle of the designed vehicle is at the quarter point, usually takes 0.75.

[0049] Compare the actual maximum bending moment with the allowable bending moment value, and calculate the bending moment safety reserve coefficient. The bending moment safety reserve coefficient is the ratio of the allowable bending moment value to the actual maximum bending moment, and the calculation formula is:

[0050] This coefficient reflects the safety margin of the Bailey beam in terms of bending stress, > 1 indicates that the safety requirements are met, the larger it is, the higher the safety margin.

[0051] Compare the actual maximum shear force with the allowable shear force value, and calculate the shear force safety reserve coefficient. The shear force safety reserve coefficient is the ratio of the allowable shear force value to the actual maximum shear force, and the calculation formula is:

[0052] This coefficient reflects the safety margin of the Bailey beam in terms of shear stress, and also requires > 1 to meet the safety requirements.

[0053] Finally, combine the bending moment safety reserve coefficient and the shear force safety reserve coefficient to generate the safety margin data of the main structure. The combination process uses the weighted average method or the minimum value method. The calculation formula of the weighted average method is:

[0054] Wherein and They are the weight coefficients of bending moment and shear force respectively, satisfying + = 1. Usually, the weight of the bending moment is larger. For example, = 0.7, = 0.3. The minimum value rule directly takes the smaller value of the two safety reserve coefficients as the overall safety margin index :

[0055] The safety margin data of the main structure is a comprehensive safety assessment index, which usually includes three parts of data: the bending moment safety reserve coefficient, the shear force safety reserve coefficient, and the overall safety margin index, providing important references for the subsequent beam force checking and construction installation.

[0056] For example, for a 6-row single-layer 321-type Bailey beam temporary bridge with a span of 15 meters, the allowable bending moment value of a single-row single-layer Bailey beam is found from the Bailey beam technical manual to be 788 kN·m, and the allowable shear force value is 245 kN. Calculated according to the row efficiency coefficient of 0.95, the allowable bending moment value of the current Bailey beam structure is 788×6×0.95 = 4490 kN·m, and the allowable shear force value is 245×6×0.95 = 1397 kN. Extract the design load value at the maximum internal force point from the temporary bridge load action table. The dead load is 9.93 kN / m, and the live load is 264.5 kN. According to the bending moment calculation formula, the actual maximum bending moment is 9.93×15² / 8 + 264.5×15 / 4 = 3661 kN·m. Extract the design load value at the support, and according to the shear force calculation formula, the actual maximum shear force is 9.93×15 / 2 + 264.5×0.75 = 1221 kN. The calculated bending moment safety reserve coefficient is 4490 / 3661 = 1.23, and the shear force safety reserve coefficient is 1397 / 1221 = 1.14. Using the minimum value method to generate the safety margin data of the main structure, the overall safety margin index is 1.14, indicating that the Bailey beam temporary bridge structure meets the safety requirements, but the shear force safety margin is relatively small and needs special attention during construction and use.

[0057] In a specific embodiment, the process of executing step S105 may specifically include the following steps: (1) Extract the crossbeam spacing value and the I-beam specification parameters from the temporary bridge foundation design parameter table, and establish a crossbeam force calculation coordinate system; (2) Convert the design vehicle axle weight in the temporary bridge load action table into a crossbeam local load distribution pattern, and use the beam theory calculation formula to calculate the maximum bending moment value and the transverse shear force value of the crossbeam; (3) Divide the maximum bending moment value of the crossbeam by the cross-sectional modulus of the crossbeam to obtain the actual bending stress value, and divide the transverse shear force value by the cross-sectional area of the crossbeam to obtain the actual shear stress value; (4) Compare the actual bending stress value with the allowable bending stress value and the actual shear stress value with the allowable shear stress value to generate the crossbeam strength verification result; (5) Extract the geometric parameters and material properties of the bridge deck from the temporary bridge foundation design parameter table, calculate the force per unit area of the bridge deck according to the vehicle tire contact area data, and use the two-way slab theory formula to calculate the maximum stress and maximum deflection of the bridge deck; (6) Compare the maximum stress of the bridge deck with the allowable stress of the material and compare the maximum deflection with the specification limit value to generate the bridge deck strength verification result, and integrate it with the crossbeam strength verification result to form the strength inspection result of the accessory components.

[0058] Specifically, extract the crossbeam spacing value and the I-beam specification parameters from the temporary bridge foundation design parameter table, and establish a crossbeam force calculation coordinate system. The crossbeam spacing value refers to the distance between adjacent I-beam crossbeams, usually ranging from 0.9 m to 1.2 m, which is determined according to the Bailey beam length and overall structure requirements. The I-beam specification parameters include geometric characteristic data such as the I-beam model (such as I20), length, cross-sectional area, and section modulus. When establishing the crossbeam force calculation coordinate system, define the crossbeam length direction as the x-axis, with one end of the crossbeam as the origin and the other end as the end point of the positive x-axis direction to form a one-dimensional coordinate system, providing a spatial reference framework for subsequent local load distribution calculations. The process of converting the design vehicle axle load in the temporary bridge load action table into the crossbeam local load distribution pattern and using the beam theory calculation formula to calculate the maximum bending moment value and transverse shear force value of the crossbeam involves load transfer path analysis and distribution calculations. The specific formula is:

[0059] Among them, is the maximum bending moment value of the crossbeam, with the unit of kN·m; P is the concentrated load converted from the design vehicle axle load to the crossbeam, with the unit of kN; is the crossbeam length, with the unit of m. This formula is applicable to the central concentrated load condition of a simply supported beam and is practical for the force analysis of the crossbeam of a Bailey beam temporary bridge.

[0060] The actual bending stress value is obtained by dividing the maximum bending moment value of the crossbeam by the section modulus of the crossbeam, and the actual shear stress value is obtained by dividing the transverse shear force value by the cross-sectional area of the crossbeam. The section modulus of the crossbeam is an important geometric characteristic parameter of the I-beam, indicating its ability to resist bending deformation. The larger the section modulus, the smaller the stress generated under the same bending moment. The actual bending stress value is calculated by dividing the bending moment by the section modulus, and the actual shear stress value is calculated by dividing the shear force by the cross-sectional area. By comparing these actual stress values with the corresponding allowable stress values, it is determined whether the crossbeam meets the strength requirements. The geometric parameters and material properties of the bridge deck are extracted from the design parameter table of the temporary bridge foundation, and the force value per unit area of the bridge deck is calculated based on the vehicle tire contact area data. The geometric parameters of the bridge deck mainly include the plate thickness and the support span, and the material properties include mechanical property indexes such as the elastic modulus and the yield strength. The two-way plate theory formula is used to calculate the maximum stress and the maximum deflection of the bridge deck, and these calculated values are compared with the allowable values of the material to ensure that the bridge deck has sufficient load-bearing capacity. Finally, the crossbeam strength verification result and the bridge deck strength verification result are integrated to form a complete strength inspection result of the accessory components, providing an important basis for the overall safety assessment of the Bailey beam temporary bridge.

[0061] In a specific embodiment, the process of executing step S106 may specifically include the following steps: (1) Perform weighted superposition analysis on the bending moment safety reserve coefficient and the shear force safety reserve coefficient in the main structure safety margin data to obtain the comprehensive safety assessment index of the main structure; (2) According to the strength inspection result of the accessory components, extract the critical stress ratio of the crossbeam strength verification result and the bridge deck strength verification result to form a bearing capacity status table of the accessory components; (3) Based on the comprehensive safety assessment index of the main structure and the bearing capacity status table of the accessory components, formulate the construction technical key points of the critical nodes of the Bailey beam temporary bridge, including the assembly specification of the Bailey beam, the setting requirements of the supports, and the installation standards of the connecting components; (4) Based on the design parameter table of the temporary bridge foundation and combined with the main structure safety margin data, determine the minimum number of support points and the optimal support layout plan of the Bailey beam temporary bridge, and generate a support system layout diagram; (5) According to the load distribution characteristics in the temporary bridge load action table, divide the bearing capacity grade interval of the Bailey beam temporary bridge, and formulate corresponding traffic control measures and traffic restriction conditions to form a safety management regulation for the use of the temporary bridge; (6) Integrate the construction technical key points of the critical nodes of the Bailey beam temporary bridge, the support system layout diagram and the safety management regulation for the use of the temporary bridge to generate a construction and installation guidance document for the Bailey beam temporary bridge.

[0062] Specifically, the bending moment safety reserve coefficient and the shear force safety reserve coefficient in the main structure safety margin data are subjected to weighted superposition analysis to obtain the comprehensive safety assessment index of the main structure. Weighted superposition analysis refers to the weighted average calculation by assigning different weight values to the bending moment safety reserve coefficient and the shear force safety reserve coefficient according to the force characteristics of the Bailey beam. In specific operations, for Bailey beam temporary bridges with different spans, the weight of the bending moment safety reserve coefficient is usually set to 0.6 - 0.7, and the weight of the shear force safety reserve coefficient is set to 0.3 - 0.4, with the sum of the weights being 1. For example, when the bending moment safety reserve coefficient is 1.23 and the shear force safety reserve coefficient is 1.14, if the bending moment weight is taken as 0.65 and the shear force weight is 0.35, then the comprehensive safety assessment index of the main structure is 1.23×0.65 + 1.14×0.35 = 1.2. The comprehensive safety assessment index is an important parameter for measuring the overall safety level of the main structure of the Bailey beam temporary bridge. The larger this value, the higher the safety margin.

[0063] According to the strength inspection results of the accessory components, when extracting the critical stress ratio of the crossbeam strength verification result and the bridge deck strength verification result to form the bearing capacity status table of the accessory components, key data such as the crossbeam bending stress utilization rate, crossbeam shear stress utilization rate, maximum stress utilization rate of the bridge deck, and maximum deflection utilization rate of the bridge deck need to be extracted respectively. The critical stress ratio refers to the ratio of the actual stress to the allowable stress, or the ratio of the actual deflection to the allowable deflection, which reflects the proximity of the component's stress state to the safety limit. For example, if the actual bending stress of the crossbeam is 52 MPa and the allowable bending stress is 160 MPa, then the bending stress utilization rate is 52÷160 = 0.325. The bearing capacity status table of the accessory components adopts a matrix form, with each row representing a type of component and each column representing a stress state or deformation index. The corresponding utilization rate values are filled in the cells. This table clearly shows the stress conditions of each accessory component, facilitating the identification of weak links and safety redundancy parts. Based on the comprehensive safety assessment index of the main structure and the bearing capacity status table of the accessory components, the key node construction technical points of the Bailey beam temporary bridge are formulated, including the Bailey beam assembly specification, support setting requirements, and connection component installation standards. This process is the key step in transforming the structural safety analysis results into specific construction guidance. The Bailey beam assembly specification is mainly determined according to the number of rows, layers of the Bailey beam, and the comprehensive safety assessment index, including the butt joint method of the Bailey slices, tightening torque, assembly sequence, etc. The support setting requirements are determined based on the safety reserve coefficient and the span length, specifying parameters such as the support width, contact area, and cushion material. The connection component installation standards cover the installation requirements of 90-degree brackets, connecting plates, steel pins, and safety pins. Especially for the node positions with a relatively large critical stress ratio, strengthening measures and precautions are proposed.

[0064] Based on the design parameter table of the temporary bridge foundation and combined with the safety margin data of the main structure, determine the minimum number of support points and the optimal support layout plan for the Bailey beam temporary bridge, and generate the support system layout drawing. The calculation of the minimum number of support points is based on the span of the Bailey beam and the safety margin data of the main structure, and is usually determined by empirical formulas. For example, for a Bailey beam temporary bridge with a span in the range of 12 - 15 meters, the minimum number of support points should not be less than 4. The optimal support layout plan considers the position distribution of the support points, such as equal-spacing layout or increasing the support density at locations with larger bending moments, etc. The support system layout drawing is a detailed engineering drawing that indicates the precise positions, elevations, bearing capacities, and structural forms of each support point, providing an intuitive guiding basis for construction personnel.

[0065] According to the load distribution characteristics in the load action table of the temporary bridge, divide the load-bearing grade intervals of the Bailey beam temporary bridge, formulate corresponding traffic control measures and traffic restriction conditions, and form the safety management regulations for the use of the temporary bridge. This process first analyzes the load distribution curve in the load action table of the temporary bridge, identifies the key stress points, and considers the comprehensive safety assessment index of the main structure and the critical stress ratio of the accessory components. The load-bearing capacity of the Bailey beam temporary bridge is divided into multiple grades, such as Grade A (full-load passage), Grade B (load-limited passage), Grade C (single-vehicle passage), etc. For each load-bearing grade, corresponding traffic control measures are formulated, including speed limit values, vehicle spacing, maximum axle load and other restriction conditions. The safety management regulations for the use of the temporary bridge is a systematic document that includes daily inspection items, regular maintenance requirements, emergency handling plans for abnormal situations, etc., to ensure the safety and stability of the Bailey beam temporary bridge during use.

[0066] Integrate the key node construction technical points, the support system layout drawing, and the safety management regulations for the use of the Bailey beam temporary bridge to generate the construction and installation guidance document for the Bailey beam temporary bridge. The integration process adopts a modular organization method, arranging and combining different types of technical documents according to the construction sequence and importance to form a systematic and complete guiding document. The construction and installation guidance document for the Bailey beam temporary bridge usually includes multiple chapters such as project overview, technical parameter table, construction flow chart, quality control key points, acceptance standards, and emergency plans, providing comprehensive guidance for the safe erection and use of the Bailey beam temporary bridge.

[0067] For example, for a temporary bridge with a span of 15 meters and using 6 rows of single-layer 321-type Bailey beams, the calculated bending moment safety reserve coefficient is 1.23, and the shear force safety reserve coefficient is 1.14. Taking the weights as 0.65 and 0.35 respectively, the comprehensive safety assessment index of the main structure is calculated to be 1.2. The strength inspection results of the accessory components show that the utilization rate of the bending stress of the cross beam is 0.325, the utilization rate of the shear stress of the cross beam is 0.29, and the maximum stress utilization rate of the bridge deck is 0.62. Based on this, a bearing capacity status table of the accessory components is formed. According to the comprehensive safety assessment index and the bearing capacity status table, a detailed Bailey beam assembly specification is formulated. For example, double pins must be used at the butt joints of the Bailey sheets and the torque shall not be less than 120 N·m. The minimum number of support points is determined to be 4, with a spacing of 3 meters in the mid-span area and a spacing of 2 meters near the supports, forming a support system layout diagram. According to the load distribution characteristics, this temporary bridge is classified as Class A load-bearing grade, allowing vehicles below 80 tons to pass, with a speed limit of 15 km / h, and the vehicle spacing shall not be less than 30 meters. These technical points and management regulations are integrated to form a construction and installation guidance document.

[0068] The above describes the load calculation method of the Bailey beam of the steel temporary bridge in the embodiment of the present application. Next, the load calculation system of the Bailey beam of the steel temporary bridge in the embodiment of the present application will be described. Please refer to Figure 2 , an embodiment of the load calculation system of the Bailey beam of the steel temporary bridge in the embodiment of the present application includes: A configuration module for measuring the span of the steel temporary bridge, the width of the bridge deck and the parameters of the Bailey sheets, determining the number of rows and layers of the Bailey beams, and obtaining a design parameter table of the temporary bridge foundation; A calculation module for calculating the self-weight of the Bailey beam and the weight of the bridge deck components according to the design parameter table of the temporary bridge foundation, and obtaining the load value per linear meter of the temporary bridge; An analysis module for determining the maximum internal force point according to the load value per linear meter of the temporary bridge and the designed vehicle axle weight by the position condition analysis method, and forming a load action table of the temporary bridge; A generation module for querying the standard internal force table of the Bailey beam, checking the bending moment and shear force of the main beam according to the load action table of the temporary bridge, and generating safety margin data of the main structure; A checking module for checking the stress condition of the cross beam and the load-bearing capacity of the bridge deck based on the safety margin data of the main structure, and obtaining the strength inspection results of the accessory components; An integration module for integrating the safety margin data of the main structure and the strength inspection results of the accessory components to generate a construction and installation guidance document for the Bailey beam temporary bridge.

[0069] Through the collaborative cooperation of the above-mentioned various components, by measuring the span of the steel temporary bridge, the width of the bridge deck and the parameters of the Bailey truss, determining the number of rows and layers of the Bailey truss, obtaining the design parameter table of the temporary bridge foundation, and establishing a standardized process for collecting temporary bridge parameters, the accuracy and comprehensiveness of data acquisition are effectively improved, laying a solid foundation for subsequent calculations; based on the design parameter table of the temporary bridge foundation, when calculating the self-weight of the Bailey truss and the weight of the bridge deck components and obtaining the load value per linear meter of the temporary bridge, the method of itemized calculation and comprehensive integration is adopted, making the load calculation more accurate, and reducing the error by more than 30% compared with the traditional empirical estimation; according to the load value per linear meter of the temporary bridge and the axle weight of the designed vehicle, the maximum internal force point is determined according to the position condition analysis method, forming the load action table of the temporary bridge. This feature introduces the idea of multi-condition analysis and overcomes the limitation of only considering a single load position in the traditional method; by querying the standard internal force table of the Bailey truss and checking the bending moment and shear force of the main girder according to the load action table of the temporary bridge, the safety margin data of the main structure is generated, realizing the accurate conversion from load to internal force, and the calculation of the safety reserve coefficient is more objective; based on the safety margin data of the main structure, the stress condition of the cross beam and the bearing capacity of the bridge deck are checked, and the strength inspection results of the accessory components are obtained, expanding the safety assessment from the main girder to the overall structure and filling the deficiency of ignoring the accessory components in the traditional method; integrating the safety margin data of the main structure and the strength inspection results of the accessory components, generating the construction and installation guidance document for the Bailey truss temporary bridge, and establishing a conversion mechanism from the data analysis result to the actual construction guidance, enabling the design result to directly guide the engineering practice. It is particularly worth noting that the load identification algorithm applied in the position condition analysis method of this method realizes the accurate mapping of the relationship between the load position and the internal force by digitally characterizing the vehicle load and combining it with the structural characteristics of the Bailey truss. The application of this algorithm enables the influence of vehicles with different models and axle weights on the Bailey truss structure to be accurately calculated, greatly improving the adaptability and accuracy of the load calculation and solving the limitation problem of the traditional empirical formula in the face of complex loads.

[0070] Referring to Figure 3 , in the embodiment of the present invention, a computer device is further provided. The computer device may be a server, and its internal structure may be as Figure 3 shown. The computer device includes a processor, a memory, a display screen, an input device, a network interface, and a database connected through a system bus. Among them, the processor of the computer design is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program, and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store the corresponding data in this embodiment. The network interface of the computer device is used to communicate with an external terminal through a network connection. The computer program, when executed by the processor, implements the above method.

[0071] Those skilled in the art can understand that Figure 3 The structure shown in Figure 3 is only a block diagram of some structures related to the solution of the present invention, and does not constitute a limitation on the computer device to which the solution of the present invention is applied.

[0072] An embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the above method is implemented. It can be understood that the computer-readable storage medium in this embodiment can be a volatile readable storage medium or a non-volatile readable storage medium.

[0073] Those of ordinary skill in the art can understand that all or part of the processes in the above-described method embodiments can be completed by instructing relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the above-described method embodiments. Among them, any reference to a memory, storage, database, or other medium provided in the present invention and used in the embodiments can include non-volatile and / or volatile memories. Non-volatile memories can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memories can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in various forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (SSRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM, etc.

[0074] Those skilled in the art can clearly understand that for the convenience and brevity of description, the specific working processes of the above-described system, system, and unit can refer to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0075] When the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The foregoing storage medium includes: various media that can store program codes, such as USB flash drives, mobile hard disks, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical discs.

[0076] As described above, the above embodiments are only used to illustrate the technical solutions of the present application and are not intended to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present application.

Claims

1. A load calculation method for the Bailey beam of a steel temporary bridge, characterized in that, The load calculation method for the Bailey beam of the steel temporary bridge includes: Measuring the span, deck width and Bailey slice parameters of the steel temporary bridge, determining the number of rows and layers of the Bailey beam configuration, and obtaining the design parameter table of the temporary bridge foundation; According to the design parameter table of the temporary bridge foundation, calculating the self-weight of the Bailey beam and the weight of the deck components, and obtaining the load value per linear meter of the temporary bridge; Based on the load value per linear meter of the temporary bridge and the design vehicle axle weight, determining the maximum internal force point according to the position condition analysis method, and forming the load action table of the temporary bridge; Querying the standard internal force table of the Bailey beam, checking the bending moment and shear force of the main beam according to the load action table of the temporary bridge, and generating the safety margin data of the main structure; Based on the safety margin data of the main structure, checking the stress condition of the cross beam and the bearing capacity of the deck, and obtaining the strength inspection results of the accessory components; Integrating the safety margin data of the main structure and the strength inspection results of the accessory components, and generating the construction and installation guidance document for the Bailey beam temporary bridge.

2. The load calculation method of the Bailey beam of the steel temporary bridge according to claim 1, wherein, The measuring the span, deck width and Bailey slice parameters of the steel temporary bridge, determining the number of rows and layers of the Bailey beam configuration, and obtaining the design parameter table of the temporary bridge foundation includes: Using precision measuring equipment to perform multi-point positioning measurement on the terrain on both banks of the bridge site, and obtaining the actual width and elevation difference data of the river channel; According to the actual width and elevation difference data of the river channel, considering the lap length on both banks and the safety margin coefficient, determining the single-span design length value of the Bailey beam; Based on the passing requirements of load-carrying vehicles in traffic engineering specifications, and combining with the wheelbase parameters of the design vehicle, setting the value of the deck net width; Through structural force analysis, determining the optimal combination plan of the number of rows and layers of the standard Bailey beam, and setting the corresponding number of brackets and connecting plates; Measuring the specifications of the I-beam cross beam, and recording five key geometric parameters including its length, flange spacing, cross-sectional area, moment of inertia of the cross section, and section modulus; Measuring the thickness and size specifications of the deck diamond plate, as well as the geometric dimensions and material strength indexes of the channel steel column and steel pipe guardrail system; Combining the hydrological data of the designed flow rate and flow velocity of the river channel, and evaluating the influence degree of water flow scouring on the bridge stability; Integrating the design length of the Bailey beam, the deck net width, the row and layer plan of the Bailey beam, the bracket layout parameters, the cross beam specification data, the deck material parameters, and the hydrological influence evaluation results, and generating the design parameter table of the temporary bridge foundation including the structural layout, material properties, and environmental factors.

3. The load calculation method of the Bailey beam of the steel temporary bridge according to claim 1, wherein, The calculating the self-weight of the Bailey beam and the weight of the deck components according to the design parameter table of the temporary bridge foundation, and obtaining the load value per linear meter of the temporary bridge includes: Extracting the single weight data of the Bailey slice from the standard Bailey beam component specification table, and combining with the number of rows and layers of the Bailey beam configuration in the design parameter table of the temporary bridge foundation, calculating the total weight of the main Bailey beam; Counting the quantity and single weight of the 90-degree brackets, connecting plates, steel pins and safety pins, and calculating the total weight of the connecting components; Based on the cross beam specification parameters in the design parameter table of the temporary bridge foundation, measuring the volume and density of the I-beam cross beam, and obtaining the total weight of the cross beam; According to the deck material parameters in the design parameter table of the temporary bridge foundation, calculating the product of the area and thickness of the diamond plate, and multiplying by the steel density to obtain the weight of the deck; Based on the guardrail system parameters in the design parameter table of the temporary bridge foundation, calculating the total length of the channel steel column and steel pipe, and multiplying by the corresponding linear density to obtain the weight of the guardrail system; Add the total weight of the main Bailey beams, the total weight of the connecting members, the total weight of the cross beams, the weight of the bridge deck, and the weight of the guardrail system, and divide by the length of the Bailey beams to obtain the load value per linear meter of the temporary bridge.

4. The load calculation method for the Bailey beam of the steel temporary bridge according to claim 1, characterized in that Based on the load value per linear meter of the temporary bridge and the design vehicle axle weight, determine the maximum internal force points according to the position condition analysis method to form a load action table for the temporary bridge, including: Extract the load value per linear meter of the temporary bridge and multiply by the total length of the Bailey beams to obtain the total value of the bridge dead load; Obtain the maximum axle weight data of the design vehicle from the traffic load specification to form a moving load value; Establish a mid-span position condition, place the moving load value at the mid-span point of the Bailey beams, and calculate the load distribution curve of the mid-span position condition; Establish a quarter-point position condition, place the moving load value at the quarter-point positions of the Bailey beams respectively, and calculate the load distribution curve under the quarter-point position condition; Compare the load distribution curves under the mid-span position condition and the quarter-point position condition, identify the most unfavorable stress states of each component, and mark the positions of the maximum internal force points; Combine the total value of the bridge dead load and the moving load value according to the safety factor to obtain the design load value at the maximum internal force point, and form a load action table for the temporary bridge.

5. The load calculation method of the Bailey beam of the steel temporary bridge according to claim 1, characterized in that, Query the standard internal force table of the Bailey beams, check the bending moment and shear force of the main beam according to the load action table of the temporary bridge, and generate safety margin data for the main structure, including: Extract the data of the standard internal force table from the Bailey beam technical manual to obtain the allowable bending moment value and allowable shear force value under different combinations of rows and layers; Query the row number and layer configuration of the Bailey beams in the foundation design parameter table of the temporary bridge to determine the internal force allowable value of the current Bailey beam structure; Extract the design load value at the maximum internal force point from the load action table of the temporary bridge, and calculate the actual maximum bending moment according to the bending moment calculation formula; Extract the design load value at the support from the load action table of the temporary bridge, and calculate the actual maximum shear force according to the shear force calculation formula; Compare the actual maximum bending moment with the allowable bending moment value, and calculate the bending moment safety reserve coefficient; Compare the actual maximum shear force with the allowable shear force value, and calculate the shear force safety reserve coefficient; Combine the bending moment safety reserve coefficient and the shear force safety reserve coefficient to generate safety margin data for the main structure.

6. The load calculation method for the Bailey truss of the steel temporary bridge according to claim 1, characterized in that Based on the safety margin data of the main structure, check the stress condition of the cross beams and the bearing capacity of the bridge deck to obtain the strength inspection results of the accessory components, including: Extract the cross beam spacing value and I-beam specification parameters from the foundation design parameter table of the temporary bridge to establish a coordinate system for calculating the stress of the cross beams; Convert the design vehicle axle weight in the load action table of the temporary bridge into a local load distribution pattern of the cross beams, and calculate the maximum bending moment value and transverse shear force value of the cross beams by using the beam theory calculation formula; Divide the maximum bending moment value of the cross beams by the section modulus of the cross beams to obtain the actual bending stress value, and divide the transverse shear force value by the cross-sectional area of the cross beams to obtain the actual shear stress value; Compare the actual bending stress value with the allowable bending stress value and the actual shear stress value with the allowable shear stress value to generate the cross beam strength verification result; Extract the geometric parameters and material properties of the bridge deck from the design parameter table of the temporary bridge foundation, calculate the force value per unit area of the bridge deck according to the vehicle tire contact area data, and calculate the maximum stress and maximum deflection of the bridge deck using the two-way slab theory formula; Compare the maximum stress of the bridge deck with the allowable stress of the material and compare the maximum deflection with the specification limit value to generate the strength verification result of the bridge deck, and integrate it with the strength verification result of the cross beam to form the strength inspection result of the accessory components.

7. The load calculation method for the Bailey beam of the steel temporary bridge according to claim 1, characterized in that, Integrate the safety margin data of the main structure and the strength inspection result of the accessory components to generate the construction and installation guidance document for the Bailey beam temporary bridge, including: Perform weighted superposition analysis on the bending moment safety reserve coefficient and shear force safety reserve coefficient in the safety margin data of the main structure to obtain the comprehensive safety assessment index of the main structure; According to the strength inspection result of the accessory components, extract the critical stress ratio of the cross beam strength verification result and the bridge deck strength verification result to form the bearing capacity status table of the accessory components; Based on the comprehensive safety assessment index of the main structure and the bearing capacity status table of the accessory components, formulate the construction technical key points of the key nodes of the Bailey beam temporary bridge, including the Bailey beam assembly specification, the requirements for the setting of supports, and the installation standards of connecting components; Based on the design parameter table of the temporary bridge foundation and combined with the safety margin data of the main structure, determine the minimum number of support points and the optimal support layout plan of the Bailey beam temporary bridge, and generate the support system layout diagram; According to the load distribution characteristics in the load action table of the temporary bridge, divide the load bearing grade interval of the Bailey beam temporary bridge, and formulate corresponding traffic control measures and traffic restriction conditions to form the safety management regulations for the use of the temporary bridge; Integrate the construction technical key points of the key nodes of the Bailey beam temporary bridge, the support system layout diagram and the safety management regulations for the use of the temporary bridge to generate the construction and installation guidance document for the Bailey beam temporary bridge.

8. A steel temporary bridge Bailey beam load calculation system for implementing the steel temporary bridge Bailey beam load calculation method according to any one of claims 1-7, characterized in that, The steel temporary bridge Bailey beam load calculation system includes: A configuration module for measuring the span of the steel temporary bridge, the deck width and the Bailey slice parameters, determining the number of rows and layers of the Bailey beam configuration, and obtaining the design parameter table of the temporary bridge foundation; A calculation module for calculating the self-weight of the Bailey beam and the weight of the deck components according to the design parameter table of the temporary bridge foundation, and obtaining the load value per linear meter of the temporary bridge; An analysis module for determining the maximum internal force point according to the load value per linear meter of the temporary bridge and the designed vehicle axle weight according to the position condition analysis method to form the load action table of the temporary bridge; A generation module for querying the standard internal force table of the Bailey beam, checking the bending moment and shear force of the main beam according to the load action table of the temporary bridge, and generating the safety margin data of the main structure; A checking module for checking the stress condition of the cross beam and the bearing capacity of the bridge deck based on the safety margin data of the main structure to obtain the strength inspection result of the accessory components; An integration module for integrating the safety margin data of the main structure and the strength inspection result of the accessory components to generate the construction and installation guidance document for the Bailey beam temporary bridge.

9. A computer device, characterized in that, It includes a memory and a processor, and the memory stores a computer program that can run on the processor. The feature is that when the processor executes the computer program, it implements the steel temporary bridge Bailey beam load calculation method according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, A computer program is stored thereon, and when the computer program is run by a processor, the processor is caused to execute the calculation method for the load of the steel Bailey beam of the steel temporary bridge as described in any one of claims 1 to 7.

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