A modular reinforcement method for steel bar joints

Abstract

This invention relates to the field of rebar joint reinforcement technology, specifically a modular rebar joint reinforcement method. The method comprises: S1. On-site survey and joint analysis, recording the existing joint conditions, including rebar diameter, spacing, and degree of corrosion; precise measurement using a laser scanner; and simulation of the joint stress state using ANSYS or SAP2000 to determine the location and extent of joints requiring reinforcement; S2. Design and fabrication of standardized modular rebar components, using HRB500 rebar with specifications of 12mm, 16mm, and 20mm; a joint spacing of 300mm module width and 500mm length; standardized connectors using bolts or quick-connect fittings; dimensional errors controlled within ±1mm; and rust prevention treatment using epoxy coating or hot-dip galvanizing with a coating thickness ≥100μm; S3. Cleaning the joint area requiring reinforcement, removing surface rust and loose concrete layers to expose the structural layer. This invention utilizes modular rebar components and a standardized construction process, improving construction efficiency and reducing on-site construction time and labor costs.

Description

Technical Field

[0001] This invention relates to the field of rebar joint reinforcement technology, specifically a modular rebar joint reinforcement method. Background Technology

[0002] Reinforcement joints refer to the points where reinforcing bars connect to each other in reinforced concrete structures. These joints are critical parts of the entire structure, determining its overall strength and stability. Reinforcement joints are typically located at the intersections of beams, columns, slabs, and other structural members. Through proper design and reinforcement, they ensure the structure can withstand various loads and external forces.

[0003] Traditional methods of reinforcing steel joints mainly include welding additional steel bars at the joint to enhance its load-bearing capacity; increasing the density of stirrups in the joint area to improve shear resistance; wrapping the joint with a layer of reinforced concrete to increase the cross-sectional area and stiffness; and bonding steel plates or carbon fiber cloth to the surface of the joint to enhance its tensile and shear resistance.

[0004] However, traditional reinforcement methods such as welding and stirrup reinforcement generally require high-level construction skills, are prone to construction errors, have long construction times, require a large amount of manpower, and increase construction costs. Due to the complexity of the construction process, construction quality problems are prone to occur, such as weak welds and uneven distribution of stirrups. At the same time, this reinforcement method requires a large amount of steel and concrete, resulting in low material utilization and resource waste. Maintenance and inspection of the reinforced joints are difficult, affecting the long-term service performance of the structure.

[0005] In summary, a modular reinforcement method for steel bar joints needs to be proposed to solve the above problems. Summary of the Invention

[0006] The purpose of this invention is to provide a modular reinforcement method for steel bar joints to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A modular reinforcement method for steel bar joints includes the following steps:

[0009] S1. On-site survey and node analysis: Record the condition of existing nodes, including the diameter, spacing and degree of corrosion of the reinforcing bars. Use a laser scanner for precise measurement and use ANSYS or SAP2000 to simulate the stress state of the nodes to determine the location and extent of nodes that need to be reinforced.

[0010] S2. Design and process standardized modular steel reinforcement components. The steel reinforcement material is HRB500, and the specifications are 12mm, 16mm, and 20mm. The node spacing is 300mm in width and 500mm in length of the module. Standardized connectors are used, with bolted connections or quick-connect fittings. The dimensional error is controlled within ±1mm. Rust prevention treatment uses epoxy coating or hot-dip galvanizing, with a coating thickness ≥100μm.

[0011] S3. Clean the joint areas that need reinforcement, remove surface rust and loose concrete layers to expose the structural layers;

[0012] S4. Install positioning templates to ensure the precise position of modular steel bars. The template material is steel template with a thickness of ≥20mm. Use a laser level to ensure that the positioning error is ≤2mm. Use expansion bolts to fix the template with a bolt spacing of 500mm.

[0013] S5. Install the pre-processed modular steel reinforcement components. Use steel wire or clips to initially fix the modular steel reinforcement to the original steel reinforcement at a spacing of 200mm. Weld at least two sides at each joint. The weld length is ≥10cm. The welding current is 200-300A. Use standardized bolt connections or quick-connect couplings. The bolt torque is 80-100Nm.

[0014] S6. Install the formwork for pouring, ensuring the shape of the reinforced joint. Use steel formwork with a thickness of ≥20mm, spaced at 500mm intervals, and use expansion bolts to fix the formwork with a bolt spacing of 500mm.

[0015] S7. Pour concrete for the reinforced joints, using C30 strength concrete with a water-cement ratio of 0.45. Use an immersion vibrator and vibrate for 20-30 seconds per point to ensure no air bubbles or honeycomb structures.

[0016] S8. After the concrete is poured, cover it with wet burlap sacks and cure it for 7 days, keeping the concrete surface moist during the period.

[0017] S9. Inspection and acceptance of reinforced joints: Inspect concrete strength, steel bar connection quality and overall stability of joints, and conduct acceptance in accordance with the national standard GB50204-2002 to ensure that all indicators meet the design requirements.

[0018] Preferably, step S1 is implemented as follows:

[0019] S1.1. On-site inspection: Use a laser scanner to conduct a comprehensive scan of the structure, record the spatial location and shape of existing nodes, use a steel tape measure and vernier caliper to measure the diameter and spacing of existing steel bars, record the degree of steel bar corrosion, organize and record all measurement data, and form an on-site inspection report;

[0020] S1.2. Node Analysis: Input the field survey data into ANSYS or SAP2000 software, establish a node model, perform node stress simulation, analyze the stress distribution of the nodes under the existing load, determine the location and degree of node reinforcement based on the stress analysis results, and generate a node reinforcement scheme.

[0021] Preferably, step S2 is implemented as follows:

[0022] S2.1. Design of Reinforcing Steel Assembly: Use AutoCAD and SolidWorks to design the reinforcing steel assembly in detail, determine the diameter of the reinforcing steel as 12mm, 16mm, and 20mm, and the node spacing as 300mm in width and 500mm in length. Design standardized connectors, using bolt connections or quick-connect fittings, and ensure that the dimensional error is controlled within ±1mm. Design epoxy coating or hot-dip galvanizing for rust prevention, with a coating thickness ≥100μm.

[0023] S2.2. Rebar processing: HRB500 high-strength steel bars are selected, cut according to design specifications, and CNC bending machines are used to process the steel bars into the design shape to ensure processing accuracy within ±1mm. The processed steel bars are then epoxy coated or hot-dip galvanized to ensure coating thickness ≥100μm.

[0024] Preferably, step S3 is implemented as follows:

[0025] S3.1. Surface cleaning: Use an electric wire brush to remove loose rust from the surface, and use sandpaper to further polish the surface of the reinforcing bars to ensure thorough cleaning. Check the cleaning effect to ensure that the rust and loose concrete layer are completely removed.

[0026] S3.2. Exposing the structural layer: Use a pneumatic rock drill to remove the loose concrete layer on the surface to expose the solid structural layer. Control the depth of removal to ensure that only the loose parts are removed without damaging the structural layer. Clean up the debris generated during removal and keep the work area clean.

[0027] Preferably, step S4 is implemented as follows:

[0028] S4.1. Template installation: Prepare steel templates, cut them according to the shape and size of the reinforcement nodes, use a laser level to determine the installation position of the templates, ensure that the positioning error is ≤2mm, initially fix the templates in the reinforcement position, and check the position accuracy;

[0029] S4.2. Template fixing: Use a drilling machine to drill holes at the fixed position with a hole spacing of 500mm, install expansion bolts, fix the template to the structure, check the tightness of the bolts, and ensure that the template is stable and does not move.

[0030] Preferably, step S5 is implemented as follows:

[0031] S5.1. Preliminary fixing: Place the pre-processed modular steel reinforcement assembly at the reinforcement position, adjust the position, and use steel wire or clips to preliminarily fix the steel reinforcement to the original steel reinforcement at a spacing of 200mm. Check whether the installation position of the steel reinforcement assembly is accurate.

[0032] S5.2. Welding reinforcement: Prepare an electric welding machine, set the welding current to 200-300A, weld at least two sides of each joint, the weld length is ≥10cm, check the welding quality, and ensure that the weld is firm;

[0033] S5.3. Bolted connection: Use standardized bolted connections or quick-connect fittings to install the bolts, tighten them with a wrench, and control the torque to 80-100 Nm. Check the tightness of the bolted connection to ensure that the connection is secure.

[0034] Preferably, step S6 is implemented as follows:

[0035] S6.1. Template preparation: Cut steel templates according to the shape of the reinforcement node, adjust the position of the templates to match the shape of the reinforcement node, and initially fix the templates in the reinforcement position;

[0036] S6.2. Template fixing: Use a drilling machine to drill holes at the fixed position with a hole spacing of 500mm, install expansion bolts, fix the template to the structure, check the tightness of the bolts, and ensure that the template is stable and does not move.

[0037] Preferably, step S7 is implemented as follows:

[0038] S7.1. Concrete preparation: Mix concrete according to a water-cement ratio of 0.45 using a concrete mixer to ensure uniformity. Check the flowability and uniformity of the concrete to ensure that the quality meets the requirements.

[0039] S7.2. Concrete pouring: Use a concrete pump truck to pour concrete to the reinforced node, and use an immersion vibrator to vibrate it for 20-30 seconds at each point to ensure that there are no air bubbles or honeycomb. After pouring, level the concrete surface.

[0040] Preferably, step S8 is implemented as follows:

[0041] S8.1. Curing preparation: Cover the surface of the poured concrete with wet burlap sacks to ensure even coverage;

[0042] S8.2. Curing process: Use a sprinkler to initially wet the burlap sacks to ensure that the burlap sacks are completely wet. During the 7-day curing period, spray water regularly to keep the burlap sacks moist, prevent the concrete surface from drying and cracking, and ensure that the concrete surface temperature is suitable during the curing period and that there are no sudden temperature changes.

[0043] S8.3. End of curing: After the 7-day curing period, remove the wet burlap sacks, inspect the concrete surface to ensure that there are no cracks or other defects, record the curing process and results, and archive them for future reference.

[0044] Preferably, step S9 is implemented as follows:

[0045] S9.1. Concrete strength testing: A rebound hammer is used to conduct preliminary strength testing on the concrete of the reinforced joint. If the preliminary test results need further confirmation, a core drill is used to take samples and send them to the laboratory for detailed testing. Based on the test results, the concrete strength is evaluated to determine whether it meets the C30 design requirements.

[0046] S9.2. Reinforcing bar connection quality inspection: Visually inspect the reinforcing bar connection points to ensure there are no obvious defects. Use an ultrasonic flaw detector to perform non-destructive testing on the weld points to check for internal defects. Use a weld inspection instrument to check the weld length and quality to ensure that the weld length is ≥10cm and the quality meets the standards.

[0047] S9.3. Overall stability test of nodes: Install strain gauges at the reinforced nodes, conduct load tests, record strain data, apply design loads to the reinforced nodes using a load testing instrument, detect the deformation and stability of the nodes under load, analyze the test data, and evaluate whether the overall stability of the nodes meets the design requirements.

[0048] S9.4. Acceptance: Organize all test records and reports, ensure data integrity, report test results, and after confirming that all indicators meet the design requirements and GB50204-2002 national standard, sign the acceptance documents to complete the acceptance of the reinforced nodes.

[0049] Compared with existing technologies, the beneficial effects of this invention are as follows: This invention adopts modular rebar components and standardized construction processes, improving construction efficiency and reducing on-site construction time and labor costs. By using laser scanners and professional software, the geometry, rebar diameter, spacing, and corrosion status of existing nodes are accurately recorded and analyzed, ensuring the scientific accuracy of the reinforcement scheme. The standardized modular rebar component design ensures that the dimensional accuracy of the rebar components is controlled within ±1mm. The use of HRB500 high-strength steel effectively extends service life and reduces maintenance costs. The construction operation process uses laser levels and expansion bolts to ensure the precise positioning and stable fixing of the template and rebar components. C30 strength concrete is used for concrete pouring and curing, and an immersion vibrator is used to ensure the quality of concrete pouring, avoiding air bubbles and honeycomb structures. The quality inspection and acceptance process includes multiple testing measures such as concrete strength testing, rebar connection quality testing, and overall node stability testing, ensuring that the reinforcement effect meets design requirements and national standards. Comprehensive recording and reporting of test data ensures the traceability and qualification of construction quality. Detailed Implementation

[0050] Example 1

[0051] This invention proposes a modular reinforcement method for steel bar joints, comprising the following steps:

[0052] S1. On-site investigation and node analysis:

[0053] S1.1. On-site inspection: Use a laser scanner to conduct a comprehensive scan of the structure, record the spatial location and shape of existing nodes, use a steel tape measure and vernier caliper to measure the diameter and spacing of existing steel bars, record the degree of steel bar corrosion, organize and record all measurement data, and form an on-site inspection report;

[0054] S1.2. Node Analysis: Input the field survey data into ANSYS or SAP2000 software, establish a node model, perform node stress simulation, analyze the stress distribution of the nodes under the existing load, determine the location and degree of node reinforcement based on the stress analysis results, and generate a node reinforcement scheme.

[0055] S2. Design and fabrication of standardized modular steel reinforcement assemblies:

[0056] S2.1. Design of Reinforcing Steel Assembly: Use AutoCAD and SolidWorks to design the reinforcing steel assembly in detail, determine the diameter of the reinforcing steel as 12mm, 16mm, and 20mm, and the node spacing as 300mm wide and 500mm long. Design standardized connectors, using bolt connections or quick-connect fittings, and ensure that the dimensional error is controlled within ±1mm. Design epoxy coating or hot-dip galvanizing for rust prevention, with a coating thickness ≥100μm.

[0057] S2.2. Rebar processing: HRB500 high-strength steel bars are selected, cut according to design specifications, and CNC bending machine is used to process the steel bars into the design shape to ensure processing accuracy within ±1mm. The processed steel bars are then epoxy coated or hot-dip galvanized to ensure coating thickness ≥100μm.

[0058] S3. Clean the node areas that need reinforcement:

[0059] S3.1. Surface cleaning: Use an electric wire brush to remove loose rust from the surface, and use sandpaper to further polish the surface of the reinforcing bars to ensure thorough cleaning. Check the cleaning effect to ensure that the rust and loose concrete layer are completely removed.

[0060] S3.2. Exposing the structural layer: Use a pneumatic rock drill to remove the loose concrete layer on the surface to expose the solid structural layer. Control the depth of removal to ensure that only the loose part is removed without damaging the structural layer. Clean up the debris generated during removal and keep the work area clean.

[0061] S4. Install positioning template:

[0062] S4.1. Template installation: Prepare steel templates, cut them according to the shape and size of the reinforcement nodes, use a laser level to determine the installation position of the templates, ensure that the positioning error is ≤2mm, initially fix the templates in the reinforcement position, and check the position accuracy;

[0063] S4.2. Template fixing: Use a drilling machine to drill holes at the fixed position with a hole spacing of 500mm, install expansion bolts, fix the template to the structure, check the tightness of the bolts, and ensure that the template is stable and does not move;

[0064] S5. Install pre-fabricated modular steel reinforcement assemblies:

[0065] S5.1. Preliminary fixing: Place the pre-processed modular steel reinforcement assembly at the reinforcement position, adjust the position, and use steel wire or clips to preliminarily fix the steel reinforcement to the original steel reinforcement at a spacing of 200mm. Check whether the installation position of the steel reinforcement assembly is accurate.

[0066] S5.2. Welding reinforcement: Prepare an electric welding machine, set the welding current to 200-300A, weld at least two sides of each joint, the weld length is ≥10cm, check the welding quality, and ensure that the weld is firm;

[0067] S5.3. Bolted connection: Use standardized bolt connections or quick-connect couplings to install the bolts, tighten them with a wrench, and control the torque to 80-100 Nm. Check the tightness of the bolt connection to ensure that the connection is secure.

[0068] S6. Install formwork for pouring:

[0069] S6.1. Template preparation: Cut steel templates according to the shape of the reinforcement node, adjust the position of the templates to match the shape of the reinforcement node, and initially fix the templates in the reinforcement position;

[0070] S6.2. Template fixing: Use a drilling machine to drill holes at the fixed position with a hole spacing of 500mm, install expansion bolts, fix the template to the structure, check the tightness of the bolts, and ensure that the template is stable and does not move;

[0071] S7. Pour concrete to reinforce the joint:

[0072] S7.1. Concrete preparation: Mix concrete according to a water-cement ratio of 0.45 using a concrete mixer to ensure uniformity. Check the flowability and uniformity of the concrete to ensure that the quality meets the requirements.

[0073] S7.2. Concrete pouring: Use a concrete pump truck to pour concrete to the reinforced node, and use an immersion vibrator to vibrate it for 20-30 seconds per point to ensure that there are no air bubbles and honeycomb. After pouring, level the concrete surface.

[0074] S8. Curing the poured concrete:

[0075] S8.1. Curing preparation: Cover the surface of the poured concrete with wet burlap sacks to ensure even coverage;

[0076] S8.2. Curing process: Use a sprinkler to initially wet the burlap sacks to ensure that the burlap sacks are completely wet. During the 7-day curing period, spray water regularly to keep the burlap sacks moist, prevent the concrete surface from drying and cracking, and ensure that the concrete surface temperature is suitable during the curing period and that there are no sudden temperature changes.

[0077] S8.3. End of curing: After the 7-day curing period, remove the wet burlap sacks, inspect the concrete surface to ensure that there are no cracks or other defects, record the curing process and results, and archive them for future reference;

[0078] S9. Inspection and acceptance of reinforced nodes:

[0079] S9.1. Concrete strength testing: A rebound hammer is used to conduct preliminary strength testing on the concrete of the reinforced joint. If the preliminary test results need further confirmation, a core drill is used to take samples and send them to the laboratory for detailed testing. Based on the test results, the concrete strength is evaluated to determine whether it meets the C30 design requirements.

[0080] S9.2. Reinforcing bar connection quality inspection: Visually inspect the reinforcing bar connection points to ensure there are no obvious defects. Use an ultrasonic flaw detector to perform non-destructive testing on the weld points to check for internal defects. Use a weld inspection instrument to check the weld length and quality to ensure that the weld length is ≥10cm and the quality meets the standards.

[0081] S9.3. Overall stability test of nodes: Install strain gauges at the reinforced nodes, conduct load tests, record strain data, apply design loads to the reinforced nodes using a load testing instrument, detect the deformation and stability of the nodes under load, analyze the test data, and evaluate whether the overall stability of the nodes meets the design requirements.

[0082] S9.4. Acceptance: Organize all test records and reports, ensure data integrity, report test results, and after confirming that all indicators meet the design requirements and GB50204-2002 national standard, sign the acceptance documents to complete the acceptance of the reinforced nodes.

[0083] Example 2

[0084] I. Construction process:

[0085] In practical applications of modular steel reinforcement for key building nodes to improve seismic resistance, the aforementioned modular steel reinforcement node reinforcement method specifically includes the following steps:

[0086] (1) Preparatory work

[0087] Tools and equipment: Ensure that the construction site is equipped with rebar cutters, welding machines, concrete mixers, drilling machines, vibrators, and measuring instruments;

[0088] Materials needed: steel bars, formwork, concrete;

[0089] Personnel training: Construction personnel receive training on operating procedures and safety.

[0090] (2) Rebar processing

[0091] Rebar cutting: Use a rebar cutting machine to cut the rebar according to the dimensions in the design drawings;

[0092] Rebar bending: Use a rebar bending machine to bend the rebar to ensure that the bending angle and shape meet the design requirements;

[0093] (3) Reinforcing bar binding

[0094] Location of nodes: Determine the location of the reinforcement nodes according to the design drawings;

[0095] Reinforcing bar binding: Use tie wire to firmly bind the reinforcing bars together to ensure tight joint connections;

[0096] (4) Template Installation

[0097] Template installation: Install templates at the reinforced joints to ensure the templates are secure and prevent grout leakage;

[0098] Reinforce the formwork: Use steel reinforcement supports to reinforce the formwork to ensure that it does not deform during the pouring process;

[0099] (5) Concrete pouring

[0100] Concrete mixing: Use a concrete mixer to mix the concrete to ensure it is uniform;

[0101] Concrete pouring: Use a vibrator to pour the concrete evenly into the formwork, ensuring no air bubbles;

[0102] (6) Vibrating concrete

[0103] Vibration: Use a vibrator to compact the concrete to ensure it is dense;

[0104] (7) Formwork removal

[0105] Demolding time: The first demolding will be carried out 24 hours after pouring.

[0106] Formwork removal: Carefully remove the formwork, ensuring that the concrete surface is not damaged;

[0107] (8) Concrete curing

[0108] Wet curing: Cover the concrete surface with wet burlap sacks and keep it moist for 7 days;

[0109] Regular watering: Water the burlap sacks daily to keep them moist;

[0110] (9) Inspection and acceptance of reinforced nodes

[0111] Concrete strength testing: Concrete strength is tested using a rebound hammer and a core drill.

[0112] Rebar connection quality inspection: Ultrasonic flaw detectors and weld inspection instruments are used to inspect the quality of rebar connections; Overall node stability inspection: Strain gauges and load testers are used to conduct stability tests;

[0113] Acceptance: Acceptance shall be conducted based on the test results and standards.

[0114] II. Equipment and Engineering Parameters:

[0115] For the above construction methods, the equipment and equipment parameters are shown in Table 1, and the engineering parameters are shown in Table 2.

[0116] Table 1. Equipment Parameters for Modular Reinforced Joint Reinforcement Method

[0117]

[0118]

[0119] Table 2 Engineering parameters for modular reinforced joint reinforcement method

[0120]

[0121] III. Testing:

[0122] The strength of the steel reinforcement joints after the above reinforcement method is tested according to the testing method in step S9, as shown in Table 3;

[0123] Table 3 Test Results

[0124]

[0125] IV. Comparative Acceptance:

[0126] Before acceptance, the strength of the steel reinforcement joints after the reinforcement method of this invention was constructed was tested, as shown in Table 4;

[0127] Table 4 Acceptance Inspection Form

[0128]

[0129] In summary, based on the data recorded in the table, all construction steps and test results meet the design and standard requirements, indicating that the modular steel reinforcement method is effective and complies with the GB50204-2002 quality standard.

[0130] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A modular reinforcement method for steel bar joints, characterized in that, Includes the following steps: S1. On-site survey and node analysis: Record the condition of existing nodes, including the diameter, spacing and degree of corrosion of the reinforcing bars. Use a laser scanner for precise measurement and use ANSYS or SAP2000 to simulate the stress state of the nodes to determine the location and extent of nodes that need to be reinforced. S2. Design and process standardized modular steel reinforcement components. The steel reinforcement material is HRB500, and the specifications are 12mm, 16mm, and 20mm. The node spacing is 300mm in width and 500mm in length of the module. Standardized connectors are used, with bolted connections or quick-connect fittings. The dimensional error is controlled within ±1mm. Rust prevention treatment uses epoxy coating or hot-dip galvanizing, with a coating thickness ≥100μm. S3. Clean the joint areas that need reinforcement, remove surface rust and loose concrete layers to expose the structural layers; S4. Install positioning templates to ensure the precise position of modular steel bars. The template material is steel template with a thickness of ≥20mm. Use a laser level to ensure that the positioning error is ≤2mm. Use expansion bolts to fix the template with a bolt spacing of 500mm. S5. Install the pre-processed modular steel reinforcement components. Use steel wire or clips to initially fix the modular steel reinforcement to the original steel reinforcement at a spacing of 200mm. Weld at least two sides at each joint. The weld length is ≥10cm. The welding current is 200-300A. Use standardized bolt connections or quick-connect couplings. The bolt torque is 80-100Nm. S6. Install the formwork for pouring, ensuring the shape of the reinforced joint. Use steel formwork with a thickness of ≥20mm, spaced at 500mm intervals, and use expansion bolts to fix the formwork with a bolt spacing of 500mm. S7. Pour concrete for the reinforced joints, using C30 strength concrete with a water-cement ratio of 0.

45. Use an immersion vibrator and vibrate for 20-30 seconds per point to ensure no air bubbles or honeycomb structures. S8. After the concrete is poured, cover it with wet burlap sacks and cure it for 7 days, keeping the concrete surface moist during the period. S9. Inspection and acceptance of reinforced joints: Inspect concrete strength, steel bar connection quality and overall stability of joints, and conduct acceptance in accordance with the national standard GB50204-2002 to ensure that all indicators meet the design requirements.

2. The modular steel reinforcement joint reinforcement method according to claim 1, characterized in that, The implementation steps of step S1 are as follows: S1.

1. On-site inspection: Use a laser scanner to conduct a comprehensive scan of the structure, record the spatial location and shape of existing nodes, use a steel tape measure and vernier caliper to measure the diameter and spacing of existing steel bars, record the degree of steel bar corrosion, organize and record all measurement data, and form an on-site inspection report; S1.

2. Node Analysis: Input the field survey data into ANSYS or SAP2000 software, establish a node model, perform node stress simulation, analyze the stress distribution of the nodes under the existing load, determine the location and degree of node reinforcement based on the stress analysis results, and generate a node reinforcement scheme.

3. The modular steel reinforcement joint reinforcement method according to claim 2, characterized in that, The implementation steps of step S2 are as follows: S2.

1. Design of Reinforcing Steel Assembly: Use AutoCAD and SolidWorks to design the reinforcing steel assembly in detail, determine the diameter of the reinforcing steel as 12mm, 16mm, and 20mm, and the node spacing as 300mm in width and 500mm in length. Design standardized connectors, using bolt connections or quick-connect fittings, and ensure that the dimensional error is controlled within ±1mm. Design epoxy coating or hot-dip galvanizing for rust prevention, with a coating thickness ≥100μm. S2.

2. Rebar processing: HRB500 high-strength steel bars are selected, cut according to design specifications, and CNC bending machines are used to process the steel bars into the design shape to ensure processing accuracy within ±1mm. The processed steel bars are then epoxy coated or hot-dip galvanized to ensure coating thickness ≥100μm.

4. The modular steel reinforcement joint reinforcement method according to claim 3, characterized in that, The implementation steps of step S3 are as follows: S3.

1. Surface cleaning: Use an electric wire brush to remove loose rust from the surface, and use sandpaper to further polish the surface of the reinforcing bars to ensure thorough cleaning. Check the cleaning effect to ensure that the rust and loose concrete layer are completely removed. S3.

2. Exposing the structural layer: Use a pneumatic rock drill to remove the loose concrete layer on the surface to expose the solid structural layer. Control the depth of removal to ensure that only the loose parts are removed without damaging the structural layer. Clean up the debris generated during removal and keep the work area clean.

5. The modular steel reinforcement joint reinforcement method according to claim 4, characterized in that, The implementation steps of step S4 are as follows: S4.

1. Template installation: Prepare steel templates, cut them according to the shape and size of the reinforcement nodes, use a laser level to determine the installation position of the templates, ensure that the positioning error is ≤2mm, initially fix the templates in the reinforcement position, and check the position accuracy; S4.

2. Template fixing: Use a drilling machine to drill holes at the fixed position with a hole spacing of 500mm, install expansion bolts, fix the template to the structure, check the tightness of the bolts, and ensure that the template is stable and does not move.

6. The modular steel reinforcement joint reinforcement method according to claim 5, characterized in that, The implementation steps of step S5 are as follows: S5.

1. Preliminary fixing: Place the pre-processed modular steel reinforcement assembly at the reinforcement position, adjust the position, and use steel wire or clips to preliminarily fix the steel reinforcement to the original steel reinforcement at a spacing of 200mm. Check whether the installation position of the steel reinforcement assembly is accurate. S5.

2. Welding reinforcement: Prepare an electric welding machine, set the welding current to 200-300A, weld at least two sides of each joint, the weld length is ≥10cm, check the welding quality, and ensure that the weld is firm; S5.

3. Bolted connection: Use standardized bolted connections or quick-connect fittings to install the bolts, tighten them with a wrench, and control the torque to 80-100 Nm. Check the tightness of the bolted connection to ensure that the connection is secure.

7. A modular steel reinforcement joint reinforcement method according to claim 6, characterized in that, The implementation steps of step S6 are as follows: S6.

1. Template preparation: Cut steel templates according to the shape of the reinforcement node, adjust the position of the templates to match the shape of the reinforcement node, and initially fix the templates in the reinforcement position; S6.

2. Template fixing: Use a drilling machine to drill holes at the fixed position with a hole spacing of 500mm, install expansion bolts, fix the template to the structure, check the tightness of the bolts, and ensure that the template is stable and does not move.

8. A modular steel reinforcement joint reinforcement method according to claim 7, characterized in that, The implementation steps of step S7 are as follows: S7.

1. Concrete preparation: Mix concrete according to a water-cement ratio of 0.45 using a concrete mixer to ensure uniformity. Check the flowability and uniformity of the concrete to ensure that the quality meets the requirements. S7.

2. Concrete pouring: Use a concrete pump truck to pour concrete to the reinforced node, and use an immersion vibrator to vibrate it for 20-30 seconds at each point to ensure that there are no air bubbles or honeycomb. After pouring, level the concrete surface.

9. A modular steel reinforcement joint reinforcement method according to claim 8, characterized in that, The implementation steps of step S8 are as follows: S8.

1. Curing preparation: Cover the surface of the poured concrete with wet burlap sacks to ensure even coverage; S8.

2. Curing process: Use a sprinkler to initially wet the burlap sacks to ensure that the burlap sacks are completely wet. During the 7-day curing period, spray water regularly to keep the burlap sacks moist, prevent the concrete surface from drying and cracking, and ensure that the concrete surface temperature is suitable during the curing period and that there are no sudden temperature changes. S8.

3. End of curing: After the 7-day curing period, remove the wet burlap sacks, inspect the concrete surface to ensure that there are no cracks or other defects, record the curing process and results, and archive them for future reference.

10. A modular steel reinforcement joint reinforcement method according to claim 9, characterized in that, The implementation steps of step S9 are as follows: S9.

1. Concrete strength testing: A rebound hammer is used to conduct preliminary strength testing on the concrete of the reinforced joint. If the preliminary test results need further confirmation, a core drill is used to take samples and send them to the laboratory for detailed testing. Based on the test results, the concrete strength is evaluated to determine whether it meets the C30 design requirements. S9.

2. Reinforcing bar connection quality inspection: Visually inspect the reinforcing bar connection points to ensure there are no obvious defects. Use an ultrasonic flaw detector to perform non-destructive testing on the weld points to check for internal defects. Use a weld inspection instrument to check the weld length and quality to ensure that the weld length is ≥10cm and the quality meets the standards. S9.

3. Overall stability test of nodes: Install strain gauges at the reinforced nodes, conduct load tests, record strain data, apply design loads to the reinforced nodes using a load testing instrument, detect the deformation and stability of the nodes under load, analyze the test data, and evaluate whether the overall stability of the nodes meets the design requirements. S9.

4. Acceptance: Organize all test records and reports, ensure data integrity, and report test results. After confirming that all indicators meet the design requirements and the GB50204-2002 national standard, the acceptance documents are signed. Complete the acceptance work for the reinforced nodes.

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