Steel box girder support rapid turnover construction method based on modular assembly jig frame

Abstract

The invention relates to the technical field of steel box girder construction, in particular to a rapid turnover construction method for a steel box girder support based on a modular assembly jig frame. The method includes the following steps that firstly, an intelligent module is designed according to parameters of a three-dimensional model of the steel box girder; 2, site digital preprocessing is carried out, topographic data of a construction site are obtained through three-dimensional scanning, and a two-dimensional code positioning identifier corresponding to the digital model is arranged on the ground; 3, module intelligent scheduling is carried out, and real-time positioning is carried out on a transport vehicle and a jig frame module through the Internet of Things technology; fourthly, automatic assembling is conducted, and a mechanical arm with a visual recognition function is adopted to grab the standard jig frame module; 5, dynamic bearing monitoring is carried out, and stress sensors are arranged at key nodes of the jig frame; standardized, modularized and intelligent construction of the steel box girder support is achieved, the construction efficiency and precision are improved, the cost is reduced, the construction safety is guaranteed, and rapid turnover and full-life-cycle management of the support are achieved.

Description

Technical Field

[0001] This invention relates to the field of steel box girder construction technology, specifically to a rapid turnover construction method for steel box girder supports based on modular assembly jigs. Background Technology

[0002] In bridge construction, especially in the construction of long-span steel box girder bridges, the installation of steel box girders relies on a support system to provide stable support.

[0003] Based on the above, traditional steel box girder supports mostly adopt fixed structures that are welded or bolted on site, which has many drawbacks. 1. Traditional scaffolds are often designed and manufactured to be customized for specific projects, lacking versatility. After the project is completed, the scaffolds are mostly disassembled and discarded, making it impossible to reuse them, resulting in a lot of material waste and increased costs. 2. The assembly process of traditional supports mainly relies on manual operation, which is not only inefficient but also difficult to guarantee in terms of accuracy. It is easily affected by the technical level and experience of the construction personnel, resulting in uneven stress on the supports and potential safety hazards. 3. During the construction of steel box girders, traditional supports lack effective real-time monitoring methods, making it impossible to grasp the stress state and deformation of the supports in a timely manner. Once overload or structural damage occurs, it is difficult to detect and take countermeasures in time, which may lead to serious safety accidents. 4. The dismantling process of traditional supports also relies on manual labor, which is inefficient and can easily damage the support components during dismantling, further reducing the reuse value of the support. At the same time, traditional construction methods lack effective management of the entire life cycle of the support, and cannot accurately track the usage, performance status and remaining service life of the support components, which is not conducive to the maintenance and turnover scheduling of the support.

[0004] Therefore, in view of this, we studied and improved the existing structure and proposed a rapid turnover construction method for steel box girder supports based on modular assembly jigs to solve the above-mentioned problems. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a rapid turnover construction method for steel box girder supports based on modular assembly jigs, which solves the problem that traditional steel box girder supports mostly use fixed structures with on-site welding or bolt connections, resulting in many drawbacks.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a rapid turnover construction method for steel box girder supports based on modular assembly jigs, comprising the following steps: Step 1: Intelligent module design. Based on the parameters of the three-dimensional model of the steel box girder, design schemes for various standard jig modules are automatically generated. The standard jig module contains an identifiable electronic tag, and each module end is equipped with a standardized connection component with a guide structure. Step 2: Digital preprocessing of the site. The terrain data of the construction site is obtained through 3D scanning, a digital model of the site is generated, and the assembly area of ​​the formwork is planned. QR code positioning marks corresponding to the digital model are set on the ground. Step 3: Intelligent module scheduling. Using IoT technology, the transport vehicles and jig modules are located in real time. The transport sequence and unloading location of the modules are automatically planned according to the construction progress. During the transportation process, the status of the modules is monitored by a vibration monitoring device. Step 4: Automated assembly. A robotic arm with vision recognition function picks up the standard jig module, and combined with the QR code positioning mark and electronic tag information, the module is connected according to the preset assembly path. The locking torque of the connecting components is controlled by the torque sensor. Step 5: Dynamic load-bearing monitoring. Stress sensors are placed at key nodes of the formwork to monitor the stress state of the formwork during the hoisting and construction of the steel box girder in real time and generate stress change curves. Step Six: Precise installation of steel box girders. Virtual pre-assembly is carried out based on the BIM model. The position of the steel box girders is corrected in real time using a total station. The correction data is linked with the jig height adjustment system to achieve automatic leveling. Step 7: Non-destructive disassembly of modules. The disassembly sequence is determined based on stress monitoring data. Hydraulic auxiliary devices are used to separate the modules. During the disassembly process, the usage parameters of each module are recorded by electronic tags. Step 8: Intelligent module maintenance. Based on the parameters recorded by the electronic tags, maintenance plans are automatically generated. The modules are graded for testing and repair. Qualified modules are transferred to the turnover warehouse after updating the electronic tag information.

[0007] Furthermore, in step one, the standardized connection assembly includes a connecting pin with a tapered guide surface and a matching locking sleeve. A pressure sensor is provided on the surface of the connecting pin, which sends a connection in place signal when the connection pressure reaches a preset threshold.

[0008] Furthermore, in step two, the QR code positioning identifier contains three-dimensional coordinate information, has a scanning and recognition accuracy of no less than ±0.3mm, and is updated synchronously with the digital model of the construction site in real time.

[0009] Furthermore, in step three, the vibration monitoring device has a monitoring frequency range of 0-50Hz. When the vibration acceleration exceeds 0.5g, it automatically triggers an alarm and records abnormal data.

[0010] Furthermore, in step four, the repeatability of the robotic arm is no less than ±0.1mm, the visual recognition system has a recognition distance of 0.5-3m for the electronic tag, and the recognition response time is less than 0.5 seconds.

[0011] Furthermore, in step five, the sampling frequency of the stress sensor is not less than 100Hz, the measurement range is 0-200MPa, and an automatic warning is issued when the stress value is detected to exceed 80% of the design value.

[0012] Furthermore, in step six, the tire frame height adjustment system is driven by a servo motor, with an adjustment accuracy of ±0.05mm and a response time of less than 1 second, enabling multi-point synchronous adjustment.

[0013] Furthermore, in step seven, the working pressure of the hydraulic auxiliary device is 10-30 MPa, and it is equipped with a pressure protection device that automatically depressurizes when the separation force exceeds the safety threshold.

[0014] Furthermore, in step eight, the graded inspection and repair includes: Level 1 inspection for appearance and connection structure integrity, Level 2 inspection for mechanical performance indicators, and Level 3 inspection for non-destructive testing of key components. The performance parameters of the repaired module meet more than 98% of the original design standards.

[0015] Furthermore, it also includes digital twin management steps: establishing a digital twin model of the entire life cycle of the frame, mapping the status parameters of the physical modules in real time, predicting the remaining service life of the modules through historical data analysis, and planning turnover scheduling schemes in advance.

[0016] Due to the adoption of the above technical solution, the beneficial effects of the present invention's rapid turnover construction method for steel box girder supports based on modular assembly jigs are as follows: 1. Standardization and Modularization: The standard jig module designed in this invention is universal and can be reused in different projects, reducing material waste and lowering construction costs. At the same time, the modular design makes the jig assembly and disassembly more convenient, improving construction efficiency. 2. Improve construction accuracy: By setting high-precision QR code positioning marks through digital preprocessing of the site, combined with a robotic arm with visual recognition function and equipment with high repeatability positioning accuracy, the accuracy of the jig assembly and steel box girder installation is ensured, construction errors are reduced, and project quality is improved. 3. Ensuring Construction Safety: The dynamic load-bearing monitoring system can monitor the stress state of the formwork in real time. When the stress exceeds the warning value, an early warning will be issued in a timely manner, allowing staff to take timely measures to prevent safety accidents. Meanwhile, pressure sensors and pressure protection devices installed during module connection and disassembly further ensure construction safety. 4. Achieve intelligent management: By utilizing technologies such as the Internet of Things, electronic tags, and digital twins, intelligent management of the entire lifecycle of the jig module is achieved, from design, production, transportation, assembly, use, disassembly, maintenance and reporting to turnover. It can track the module status in real time, predict the remaining service life of the module, and rationally plan the turnover scheduling scheme, thereby improving management efficiency and the scientific nature of decision-making. 5. Improved construction efficiency: Automated assembly and disassembly processes reduce manual operations and improve construction efficiency. Meanwhile, the intelligent scheduling system ensures timely module supply, preventing delays in construction progress due to untimely module availability. Attached Figure Description

[0017] Figure 1 This is an overview diagram of the overall construction method of the steel box girder support rapid turnover construction method based on modular assembly frame of the present invention.

[0018] Figure 2 This is a flowchart illustrating the automated assembly and precise installation closed-loop control process of a rapid turnover construction method for steel box girder supports based on modular assembly jigs, as described in this invention.

[0019] Figure 3 This is a flowchart illustrating the modular intelligent scheduling and status monitoring process for a rapid turnover construction method of steel box girder supports based on modular assembly jigs, as described in this invention.

[0020] Figure 4 This is a flowchart illustrating the modular disassembly, maintenance, and turnover management process of a rapid turnover construction method for steel box girder supports based on modular assembly jigs, as described in this invention. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] First Embodiment Please see Figures 1 to 4 This application provides a rapid turnover construction method for steel box girder supports based on modular assembly jigs, including the following steps: Step 1: Intelligent module design. Based on the parameters of the three-dimensional model of the steel box girder, design schemes for various standard jig modules are automatically generated. The standard jig module contains an identifiable electronic tag, and each module end is equipped with a standardized connection component with a guide structure. Step 2: Digital preprocessing of the site. The terrain data of the construction site is obtained through 3D scanning, a digital model of the site is generated, and the assembly area of ​​the formwork is planned. QR code positioning marks corresponding to the digital model are set on the ground. Step 3: Intelligent module scheduling. Using IoT technology, the transport vehicles and jig modules are located in real time. The transport sequence and unloading location of the modules are automatically planned according to the construction progress. During the transportation process, the status of the modules is monitored by a vibration monitoring device. Step 4: Automated assembly. A robotic arm with vision recognition function picks up the standard jig module, and combined with the QR code positioning mark and electronic tag information, the module is connected according to the preset assembly path. The locking torque of the connecting components is controlled by the torque sensor. Step 5: Dynamic load-bearing monitoring. Stress sensors are placed at key nodes of the formwork to monitor the stress state of the formwork during the hoisting and construction of the steel box girder in real time and generate stress change curves. Step Six: Precise installation of steel box girders. Virtual pre-assembly is carried out based on the BIM model. The position of the steel box girders is corrected in real time using a total station. The correction data is linked with the jig height adjustment system to achieve automatic leveling. Step 7: Non-destructive disassembly of modules. The disassembly sequence is determined based on stress monitoring data. Hydraulic auxiliary devices are used to separate the modules. During the disassembly process, the usage parameters of each module are recorded by electronic tags. Step 8: Intelligent module maintenance. Based on the parameters recorded by the electronic tags, maintenance plans are automatically generated. The modules are graded for testing and repair. Qualified modules are transferred to the turnover warehouse after updating the electronic tag information.

[0023] Second Embodiment As a further embodiment of the first embodiment, this embodiment mainly focuses on the specific process of steel box girder construction of urban viaducts and is implemented in combination with specific engineering background; Project Background: A city viaduct project, the steel box girder section is 30m long, 12m wide, and weighs about 80t. The construction site is located next to the city's main road, with busy traffic, and has strict requirements for construction period and site occupation.

[0024] Construction process: Intelligent modular design: A three-dimensional model of the steel box girder is created using BIM software, and model parameters (length, width, weight distribution, etc.) are extracted. Three types of standard frame modules (support module, connection module, and adjustment module) are automatically generated. Electronic tags for each module record information such as module model, size, and load-bearing capacity. The preset threshold for the pressure of the connecting pins of the standardized connection components is set to 50kN.

[0025] Digital preprocessing of the site: A 3D laser scanner is used to scan the construction site, obtain topographic data and generate a digital model of the site, and two frame assembly areas are planned (each area is 32m×14m in size). A QR code positioning mark is set every 2m on the ground in each assembly area to ensure that the scanning and recognition accuracy reaches ±0.2mm.

[0026] Intelligent module scheduling: GPS positioning technology is used to locate the transport vehicles and jig modules in real time. According to the construction schedule, the support modules are transported to the edge of the assembly area for unloading. During the transportation process, the vibration monitoring device monitors in real time. When the vibration acceleration of a certain module reaches 0.4g, the system issues a warning signal and the driver slows down.

[0027] Automated assembly: Two robotic arms with vision recognition capabilities are deployed for assembly. The robotic arms first scan the QR code positioning mark on the ground to determine the initial position, then identify the electronic tag of the module (the identification distance is controlled within 1-2m), grab the support module according to the preset path and connect it. The torque sensor controls the locking torque of the connecting components to 300N・m. When the connecting pin pressure sensor detects that the pressure reaches 50kN, the connection is confirmed to be in place.

[0028] Dynamic load monitoring: Stress sensors are installed on the top of the four support legs and the middle crossbeam node of the jig, with a sampling frequency of 120Hz. When the steel box girder is hoisted above the jig and slowly placed, the stress on the jig is monitored in real time. When a sensor detects that the stress value reaches 120MPa (the design value is 150MPa), the system issues an early warning and adjusts the placement position of the steel box girder.

[0029] Precise installation of steel box girders: Virtual pre-assembly is performed based on the BIM model to determine that the allowable deviation of the installation position of the steel box girder is ±0.5mm. The position of the steel box girder is measured in real time using a total station. When the measurement finds that one end of the steel box girder is 0.3mm higher than the design position, the servo motor of the jig height adjustment system is activated to lower the corresponding support leg by 0.3mm, thereby achieving automatic leveling.

[0030] Non-destructive disassembly of modules: After the steel box girder is installed, based on the stress monitoring data (the stress of each module is lower than 60% of the design value), the disassembly sequence from the edge to the middle is determined. A hydraulic auxiliary device with a working pressure of 20MPa is used to separate the modules. When the separation force is detected to reach the safety threshold (80kN), the device automatically depressurizes to avoid damage to the modules.

[0031] Intelligent Module Maintenance: After disassembly, the usage parameters (number of uses, maximum force, etc.) recorded by the electronic tags of each module are read, and the 10 support modules are graded and tested. Among them, 8 modules only need Level 1 testing (no damage to appearance and complete connection structure), and 2 modules need Level 2 testing (mechanical performance test, elastic modulus meets the requirements). After repair, the performance parameters of all modules meet more than 99% of the original design standards. After updating the electronic tag information, they are transferred to the turnover warehouse.

[0032] Digital twin management: Establish a digital twin model of the entire life cycle of the frame, and map the position, stress, number of uses and other status parameters of each module in real time. By analyzing historical data, predict that the remaining service life of this batch of modules is about 50 turnovers, and plan the turnover scheduling scheme for the next viaduct project in advance.

[0033] Third Embodiment As a further embodiment of the first embodiment, this embodiment mainly focuses on the specific construction process of the steel box girder of the large-span stadium and is implemented in combination with the specific engineering background; Project Background: A large-span stadium project with an arc-shaped steel box girder, a maximum span of 50m and a radius of curvature of 100m. The construction site has limited space and needs to be carried out in conjunction with other steel structure construction, which places extremely high demands on construction accuracy and safety.

[0034] Construction process: Intelligent module design: Based on the three-dimensional model parameters of the arc-shaped steel box girder (characteristics such as curvature, span, and uneven weight distribution), four standard frame modules (arc support module, angle adjustment module, reinforced connection module, and auxiliary support module) are automatically generated. Electronic tags additionally record the curvature adaptation parameters of the modules, and the preset threshold for the connecting pin pressure of the standardized connection components is set to 60kN.

[0035] Digital preprocessing of the site: The construction site is scanned in all directions using a drone combined with a 3D laser scanner to generate a digital model of the site that includes the location information of other steel structures. An arc-shaped frame assembly area (52m×20m) is planned. QR code positioning marks are set on the ground every 1.5m along an arc-shaped trajectory. The scanning and recognition accuracy reaches ±0.25mm and is updated in real time with the site digital model (updated once per hour).

[0036] Intelligent module scheduling: Using IoT technology (GPS + Beidou dual-mode positioning) to locate transport vehicles and jig modules in real time. Considering the impact of cross-operations, a transport route is planned to avoid other steel structure construction areas. The curved support modules are transported to the inside of the assembly area for unloading first. During the transportation process, the vibration monitoring device is set to a monitoring frequency of 50Hz. When the vibration acceleration exceeds 0.45g, an alarm is immediately triggered, the transport vehicle stops and the module status is checked.

[0037] Automated assembly: Three robotic arms with vision recognition capabilities are deployed (one of which is a rotatable robotic arm adapted to arc-shaped assembly). The robotic arm first scans the arc-shaped QR code positioning marks on the ground to determine the arc trajectory, and then identifies the curvature adaptation parameters of the module electronic tag (recognition response time 0.4 seconds). It then grabs the arc support module according to the preset arc path for docking. The torque sensor controls the locking torque of the connecting component at 350 N·m, and the connection is confirmed to be in place when the connecting pin pressure reaches 60 kN.

[0038] Dynamic load monitoring: Stress sensors (20 in total) are installed at the arc-shaped support points, angle adjustment nodes, and reinforced connection parts of the jig. The sampling frequency is set to 150Hz, and the measurement range is 0-200MPa. When the stress value of a certain reinforced connection module reaches 140MPa (the design value is 175MPa) during the hoisting of the arc-shaped steel box girder, the system issues an early warning and adjusts the hoisting speed and angle.

[0039] Precise installation of steel box girders: Virtual pre-assembly of curved steel box girders is carried out based on BIM model to simulate the stress state at different construction stages. The allowable range of position deviation is determined to be ±0.3mm. The position of the steel box girder is measured in real time using a total station (accuracy ±0.1mm). When a section of the steel box girder is found to deviate from the designed curved trajectory by 0.2mm, the multi-point servo motors of the jig height adjustment system are started synchronously to adjust the height and angle of the corresponding support module to achieve precise leveling.

[0040] Non-destructive disassembly of modules: After the steel box girder is installed, based on the stress monitoring data (the stress of the arc support module is slightly higher than that of other modules, but all are lower than 70% of the design value), the disassembly sequence from both ends to the middle is determined. A hydraulic auxiliary device with a working pressure of 25MPa is used to separate the modules, and the safety threshold of the pressure protection device is set to 90kN to ensure non-destructive separation of the modules.

[0041] Intelligent Module Maintenance: After disassembly, the electronic tag information is read, and 15 modules are graded and tested. Three modules require Level III testing (non-destructive testing of key components, no internal defects found), while the remaining modules pass Level I or Level II testing. After repair, the module performance parameters meet more than 98.5% of the original design standards. After updating the electronic tags, the modules are transferred to the turnover warehouse.

[0042] Digital twin management: Establish a digital twin model of the formwork to map parameters such as stress changes and angle adjustment times of the module in real time during arc construction. Combined with historical data, predict the remaining service life of the module to be approximately 40 cycles. In view of the special characteristics of the arc module, develop a special maintenance plan in advance.

[0043] Fourth embodiment As a further embodiment of the first embodiment, this embodiment mainly focuses on the specific progress of the construction of steel box girders for highway cross-river bridges, and is implemented in conjunction with the specific engineering background.

[0044] Project Background: A highway bridge project spanning a river, with a single steel box girder section length of 40m, width of 15m, and weight of approximately 120t. The construction site is located by the river, with complex geological conditions (some areas are soft soil foundations), and is affected by the river's flood season, resulting in a short construction window.

[0045] Construction process: Intelligent module design: Based on the three-dimensional model parameters of the steel box girder (large weight, large width) and the characteristics of the soft soil foundation, three types of standard frame modules (heavy support module, foundation reinforcement module, and width adjustment module) are automatically generated. Electronic tags record the load-bearing limit value of the modules, and the preset threshold of the connecting pin pressure of the standardized connection components is set to 70kN.

[0046] Digital preprocessing of the site: The construction site is scanned using a combination of 3D ground-penetrating radar and 3D laser scanner to obtain topographic and geological data (distribution range of soft soil foundation, bearing capacity, etc.), generate a digital model of the site and plan two frame assembly areas (each area is 42m×17m in size). A reinforced base is added below the QR code positioning mark in the soft soil foundation area to ensure that the scanning recognition accuracy reaches ±0.3mm and is linked to the geological data in real time.

[0047] Intelligent module scheduling: The Internet of Things (IoT) technology is used to locate the transport vehicles and the tire frame modules in real time. Considering the impact of the flood season, the foundation reinforcement modules are prioritized for unloading in soft soil foundation areas. The transport route avoids low-lying areas along the river. Vibration monitoring devices monitor the process in real time. When the vibration acceleration exceeds 0.4g, the transport route is adjusted to avoid damage to the modules.

[0048] Automated assembly: Two heavy-duty robotic arms (maximum gripping weight 20t) are deployed for assembly. The robotic arms first scan the ground QR code positioning mark and the position of the reinforcement base below, and then identify the load limit value of the module electronic tag (identification distance 2-3m). The foundation reinforcement module is installed first according to the preset path, and then the heavy-duty support module is installed. The torque sensor controls the locking torque of the connecting components to 400N・m. When the pressure of the connecting pin reaches 70kN, the connection is confirmed to be in place.

[0049] Dynamic load monitoring: Stress sensors (a total of 18) are installed at the bottom of the heavy-duty support legs of the formwork, at the contact points between the foundation reinforcement module and the ground, and at the connection nodes of the width adjustment module. The sampling frequency is set to 130Hz. When the steel box girder is hoisted to the formwork, the stress state of the formwork and the foundation is monitored in real time. When the stress value of a foundation reinforcement module in a soft soil foundation area reaches 150MPa (the design value is 180MPa), the system issues an early warning and performs secondary reinforcement on the foundation in that area.

[0050] Precise installation of steel box girders: Virtual pre-assembly is carried out based on the BIM model. Considering the linear requirements of the bridge, the allowable range of position deviation is determined to be ±0.4mm. The position of the steel box girder is measured in real time using a total station. When the measurement finds that the width deviation of the steel box girder is 0.3mm, the width adjustment module of the jig is activated to adjust the spacing of the support modules on both sides to achieve precise positioning.

[0051] Non-destructive disassembly of modules: After the steel box girder is installed, based on the stress monitoring data (the stress of the foundation reinforcement module drops to less than 50% of the design value), the disassembly sequence from the middle to both ends is determined. A hydraulic auxiliary device with a working pressure of 30MPa is used to separate the modules, and the safety threshold is set to 100kN to ensure that the modules are disassembled smoothly on the soft soil foundation.

[0052] Intelligent modular maintenance: After disassembly, 20 modules are graded and tested. Five heavy support modules require secondary testing (mechanical performance testing, compressive strength meets requirements), and two foundation reinforcement modules require tertiary testing (non-destructive testing, no internal cracks). After repair, the performance parameters of all modules meet more than 98% of the original design standards. After updating the electronic tags, they are transferred to the turnover warehouse for subsequent construction of the cross-river bridge section.

[0053] Digital twin management: Establish a digital twin model of the formwork, link it with geological data, and map parameters such as module stress and foundation settlement in real time. By analyzing construction data during the flood season, it is predicted that the remaining service life of this batch of modules in the soft soil foundation environment is about 35 turnovers, and a turnover scheduling plan for construction during the flood season can be planned in advance.

[0054] Fifth embodiment As a further embodiment of the first embodiment, this embodiment mainly focuses on the specific construction process of steel box girder of steel structure factory building in industrial park, and is implemented in combination with specific engineering background.

[0055] Project Background: A steel structure factory building project in an industrial park. The steel box girder is a multi-segment structure, with each segment being 20m long, 8m wide, and weighing approximately 50t. The construction site is open, but construction needs to be completed quickly to meet the factory's production needs, thus requiring high construction efficiency. Construction process: Dynamic load-bearing capacity monitoring: Stress sensors (4 in each area) are installed at the four support leg nodes of the support frame, with a sampling frequency of 100Hz and a measurement range of 0-200MPa. The monitoring process is simplified (only the vertical force on the support legs is monitored). After the steel box girder is hoisted and placed, if the sensors detect a stress value exceeding 80% of the design value (120MPa) (i.e., 96MPa), the system only issues an audible and visual warning. Construction does not need to be suspended; only on-site technicians need to record the data and confirm that the steel box girder is placed stably. This ensures safety while minimizing the impact on construction progress. In actual construction, after the steel box girders in all areas were placed, the stress values ​​remained stable between 80-90MPa, without triggering any warnings, and construction proceeded smoothly. Precise installation of steel box girders: Based on the BIM model, multi-segment steel box girders are pre-assembled virtually in batches. The allowable deviation range for the installation position of the steel box girders is uniformly determined to be ±0.6mm (because the linear accuracy requirements for steel box girders in factory buildings are lower than those for bridges and stadiums). Two total stations are used to simultaneously conduct roving measurements on four assembly areas (with a 15-minute interval between measurements for each area). When the measurement finds that one end of the steel box girder in a certain area is 0.4mm lower than the design position, the frame height adjustment system simplifies the operation, only activating the servo motor of the corresponding support module in that area to raise the support leg by 0.4mm. The adjustment response time is controlled within 0.8 seconds, and the leveling operation for a single area takes no more than 5 minutes, ensuring the efficiency of batch construction. Non-destructive modular disassembly: After all sections of the steel box girder were installed, based on stress monitoring data (the stress on the jig in each area dropped to 60-70 MPa, lower than 60% of the design value), a disassembly sequence of simultaneous disassembly of the four areas was determined, with each area proceeding from both ends towards the middle, to minimize the overall disassembly time. A small hydraulic auxiliary device with a working pressure of 15 MPa (facilitating rapid transfer between multiple areas) was used for module separation. The safety threshold of the pressure protection device was set at 70 kN. During the disassembly process, the separation time of a single module was controlled within 1 minute, and all modules in the four areas were disassembled in just 2 hours. Intelligent Module Maintenance: After disassembly, the usage parameters of each module are quickly read via electronic tags (each module is used an average of 3 times, with a maximum stress of 85MPa). A tiered inspection is conducted using a "batch testing + sampling re-inspection" model: First, a primary visual inspection (focusing on wear on connecting components) is performed on 80 general support modules and 40 quick-connect modules. Only 5 modules were found to have minor scratches (no repair required). Then, 12 modules (10% of the total) are randomly selected for secondary mechanical performance testing (testing compressive strength and elastic modulus). All sampled modules meet the requirements, eliminating the need for tertiary non-destructive testing. After repair (only simple correction is performed on 2 modules with slightly deformed connecting components), all module performance parameters meet over 99% of the original design standards. After updating the electronic tag information, the modules are directly transferred to a temporary storage facility for another steel structure workshop project within the factory area, achieving "ready to use immediately after disassembly." Digital Twin Management: A simplified digital twin model of the module frame is established (focusing on mapping core parameters such as module usage frequency, peak stress, and current location). This eliminates the need to associate complex geological or cross-operation data. By analyzing the project's construction data, the remaining service life of these modules in similar factory projects is predicted to be approximately 80 turnovers. In conjunction with the construction plans for the subsequent three steel structure factory buildings in the industrial park, a turnover schedule is developed in advance, clearly defining the module allocation quantity and transportation time for each project. This ensures that the module turnover interval does not exceed 3 days, maximizing module utilization.

[0056] Some of the data in the above formulas are numerical calculations with dimensions removed, and the contents not described in detail in this specification are all prior art known to those skilled in the art.

[0057] The above embodiments are only used to illustrate the technical methods of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical methods of the present invention without departing from the spirit and scope of the technical methods of the present invention.

Claims

1. A rapid turnover construction method for steel box girder supports based on modular assembly jigs, characterized in that, Includes the following steps: Step 1: Intelligent Module Design: Based on the parameters of the 3D model of the steel box girder, design schemes for various standard jig modules are automatically generated; Step 2: Digital Preprocessing of the Site: Obtain the topographic data of the construction site through 3D scanning, generate a digital model of the site, plan the assembly area of ​​the formwork, and set up QR code positioning marks on the ground corresponding to the digital model; Step 3: Intelligent Module Scheduling: Using IoT technology, the transport vehicles and tire frame modules are located in real time, and the transport sequence and unloading location of the modules are automatically planned according to the construction progress. Step 4: Automated assembly: A robotic arm with vision recognition function picks up the standard frame module, and combines it with QR code positioning marks and electronic tag information to complete the module docking according to the preset assembly path; Step 5: Dynamic load-bearing monitoring: Stress sensors are installed at key nodes of the formwork to monitor the stress state of the formwork during the hoisting and construction of the steel box girder in real time and generate stress change curves; Step Six: Precise Installation of Steel Box Girder: Virtual pre-assembly is carried out based on the BIM model, and the position of the steel box girder is corrected in real time using a total station. The correction data is linked with the jig height adjustment system to achieve automatic leveling. Step 7: Non-destructive disassembly of modules: Determine the disassembly sequence based on stress monitoring data, use hydraulic auxiliary devices to separate modules, and record the usage parameters of each module through electronic tags during the disassembly process; Step 8: Intelligent Module Maintenance: Based on the parameters recorded by the electronic tags, maintenance plans are automatically generated, and the modules are graded for testing and repair. Qualified modules are transferred to the turnover warehouse after updating the electronic tag information.

2. The rapid turnover construction method for steel box girder supports based on modular assembly jigs according to claim 1, characterized in that, In step one, the standard tire frame module contains an identifiable electronic tag, and each module end is provided with a standardized connection component with a guide structure. The standardized connection component includes a connecting pin with a tapered guide surface and a matching locking sleeve. The surface of the connecting pin is provided with a pressure sensor, which sends a connection in place signal when the connection pressure reaches a preset threshold.

3. The rapid turnover construction method for steel box girder supports based on modular assembly jigs according to claim 1, characterized in that, In step two, the QR code positioning identifier contains three-dimensional coordinate information, has a scanning and recognition accuracy of no less than ±0.3mm, and is updated synchronously with the digital model of the construction site in real time.

4. The rapid turnover construction method for steel box girder supports based on modular assembly jigs according to claim 1, characterized in that, In step three, the status of the module is monitored by a vibration monitoring device during transportation. The monitoring frequency range of the vibration monitoring device is 0-50Hz. When the vibration acceleration exceeds 0.5g, an alarm is automatically triggered and abnormal data is recorded.

5. The rapid turnover construction method for steel box girder supports based on modular assembly jigs according to claim 1, characterized in that, In step four, the locking torque of the connecting components is controlled by a torque sensor, and the repeatability of the robotic arm is not less than ±0.1mm. The visual recognition system has a recognition distance of 0.5-3m for the electronic tag and a recognition response time of less than 0.5 seconds.

6. The rapid turnover construction method for steel box girder supports based on modular assembly jigs according to claim 1, characterized in that, In step five, the sampling frequency of the stress sensor is not less than 100Hz, the measurement range is 0-200MPa, and an automatic warning is issued when the stress value exceeds 80% of the design value.

7. The rapid turnover construction method for steel box girder supports based on modular assembly jigs according to claim 1, characterized in that, In step six, the tire frame height adjustment system is driven by a servo motor, with an adjustment accuracy of ±0.05mm and a response time of less than 1 second, enabling multi-point synchronous adjustment.

8. The rapid turnover construction method for steel box girder supports based on modular assembly jigs according to claim 1, characterized in that, In step seven, the hydraulic auxiliary device operates at a pressure of 10-30 MPa and is equipped with a pressure protection device that automatically depressurizes when the separation force exceeds the safety threshold.

9. A rapid turnover construction method for steel box girder supports based on modular assembly jigs according to claim 1, characterized in that, In step eight, the graded inspection and repair includes: Level 1 inspection for appearance and connection structure integrity, Level 2 inspection for mechanical performance indicators, and Level 3 inspection for non-destructive testing of key components. The performance parameters of the repaired module meet more than 98% of the original design standards.

10. A rapid turnover construction method for steel box girder supports based on modular assembly jigs according to claim 1, characterized in that, It also includes digital twin management steps: establishing a digital twin model of the entire life cycle of the frame, mapping the status parameters of the physical modules in real time, predicting the remaining service life of the modules through historical data analysis, and planning turnover scheduling schemes in advance.

Images