Modularized steel bar joint reinforcing method

Abstract

The invention relates to the technical field of reinforcing steel bar node reinforcement, in particular to a modular reinforcing steel bar node reinforcement method, which comprises the following steps: S1, carrying out field investigation and node analysis, recording the conditions of the existing node, including the diameter, spacing and corrosion degree of a reinforcing steel bar, carrying out accurate measurement by using a laser scanner, and simulating the stress state of the node by using ANSYS or SAP2000; determining positions and degrees of nodes needing to be reinforced; s2, standardized modularized steel bar assemblies are designed and machined, the steel bar materials are HRB500, the specifications are 12 mm, 16 mm and 20 mm, the module width is 300 mm, the length is 500 mm, standardized connectors are connected through bolts or quick connecting plugs, the size error is controlled to be + / -1 mm, epoxy coating or hot galvanizing is adopted for rust prevention treatment, and the coating thickness is larger than or equal to 100 micrometers; s3, a node area needing to be reinforced is cleaned, a surface rusted and loosened concrete layer is removed, and a structural layer is exposed; the modularized steel bar assemblies and the standardized construction process are adopted, the construction efficiency is improved, and the site construction period and the labor cost are reduced.

Description

Technical Field

[0001] The invention relates to the technical field of reinforcement of steel bar nodes, in particular to a modular reinforcement method of steel bar nodes. Background Art

[0002] Steel bar nodes are the places where steel bars are connected to each other in reinforced concrete structures. These nodes are the key part of the entire structure and determine the overall strength and stability of the structure. Steel bar nodes are usually located at the intersection of beams, columns, slabs and other components. Through reasonable design and reinforcement, ensure that the structure can withstand various loads and external forces.

[0003] Traditional reinforcement methods for steel nodes mainly include welding additional steel bars at the nodes to enhance the bearing capacity of the nodes; increasing the density of stirrups in the node area to improve shear resistance; wrapping a layer of reinforced concrete around the node to increase the cross-sectional area and stiffness; and gluing steel plates or carbon fiber cloths on the node surface to enhance the tensile and shear resistance of the nodes.

[0004] However, in general, the above-mentioned traditional reinforcement methods such as welding and stirrup densification require a high level of construction skills, are prone to construction errors, take a long time to construct, and require a large amount of manpower, which increases the construction cost. Due to the complex 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, with low material utilization, resulting in waste of resources. The nodes after reinforcement are difficult to maintain and inspect, which affects the long-term performance of the structure.

[0005] In summary, it is necessary to propose a modular steel bar node reinforcement method to solve the above problems. Summary of the invention

[0006] The object of the present invention is to provide a modular steel bar node reinforcement method to solve the problems raised in the above background technology.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A modular steel bar node reinforcement method comprises the following steps:

[0009] S1. Site survey and node analysis, record the conditions of existing nodes, including the diameter, spacing and corrosion degree of steel bars, use laser scanners for precise measurement, use ANSYS or SAP2000 to simulate the node stress state, and determine the location and degree of nodes that need to be reinforced;

[0010] S2. Design and manufacture standardized modular steel bar components, with steel bar material of HRB500, specifications of 12mm, 16mm, 20mm, node spacing of module width 300mm, length 500mm, standardized connectors, bolt connection or quick plug connector, dimensional error controlled within ±1mm, rust-proof treatment using epoxy coating or hot-dip galvanizing, coating thickness ≥100μm;

[0011] S3. Clean the node areas that need to be reinforced, remove the surface rust and loose concrete layer, and expose the structural layer;

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

[0013] S5. Install the pre-processed modular steel bar components, use steel wire or clips to initially fix the modular steel bars to the original steel bars, with a spacing of 200mm, and weld at least two sides of each joint, with a weld length of ≥10cm, a welding current of 200-300A, and use standardized bolt connections or quick plug connectors, with a bolt torque of 80-100Nm;

[0014] S6. Install the pouring formwork to ensure the shape of the reinforced nodes. Use steel formwork with a thickness of ≥20mm and a spacing of 500mm. Use expansion bolts to fix the formwork with a bolt spacing of 500mm.

[0015] S7. Pour the concrete for the reinforced nodes, using C30 strength concrete, water-cement ratio 0.45, using an insert vibrator, vibrating for 20-30 seconds per point, ensuring there are no bubbles or honeycombs;

[0016] S8. Curing the poured concrete, cover with wet sacks and cure for 7 days, keeping the concrete surface moist during this period;

[0017] S9. Inspection and acceptance of reinforced nodes, testing of concrete strength, steel connection quality and overall stability of nodes, acceptance in accordance with national standard GB50204-2002, ensuring that all indicators meet design requirements.

[0018] Preferably, the implementation steps of step S1 are:

[0019] S1.1. Site survey: Use a laser scanner to conduct a comprehensive scan of the structure, record the spatial position 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 a site survey report;

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

[0021] Preferably, the implementation steps of step S2 are:

[0022] S2.1. Design of steel bar components: Use AutoCAD and SolidWorks to carry out detailed design of steel bar components, determine the steel bar diameters of 12 mm, 16 mm, and 20 mm, and the node spacing of 300 mm in width and 500 mm in length, design standardized connectors, use bolt connections or quick-connect connectors, ensure that the dimensional error is controlled within ±1 mm, design epoxy coating or hot-dip galvanizing anti-rust treatment, and the coating thickness is ≥100 μm;

[0023] S2.2. Steel bar processing: Use HRB500 high-strength steel bars, cut the steel bars according to the design specifications, use CNC bending machines to process the steel bars into the designed shape, ensure that the processing accuracy is within ±1mm, and epoxy coat or hot-dip galvanize the processed steel bars to ensure that the coating thickness is ≥100μm.

[0024] Preferably, the implementation steps of step S3 are:

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

[0026] S3.2. Expose 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 the rock drill to ensure that only the loose part is removed without damaging the structural layer. Clean up the debris produced by the rock drill and keep the working area clean.

[0027] Preferably, the implementation steps of step S4 are:

[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 template, ensure that the positioning error is ≤ 2mm, initially fix the template at the reinforcement position, and check the position accuracy;

[0029] S4.2. Template fixing: Use a drilling machine to drill holes at fixed positions 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, the implementation steps of step S5 are:

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

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

[0033] S5.3. Bolt connection: Use standardized bolt connections or quick-connect connectors, install the bolts, tighten the bolts with a wrench, and control the torque to 80-100Nm. Check the tightness of the bolt connection to ensure a firm connection.

[0034] Preferably, the implementation steps of step S6 are:

[0035] S6.1. Formwork preparation: Cut the steel formwork according to the shape of the reinforcement node, adjust the position of the formwork to make it match the shape of the reinforcement node, and initially fix the formwork at the reinforcement position;

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

[0037] Preferably, the implementation steps of step S7 are:

[0038] S7.1. Concrete preparation: Mix concrete according to a water-cement ratio of 0.45, use a concrete mixer to mix, ensure the concrete is uniform, check the fluidity and uniformity of the concrete, and ensure that the quality meets the requirements;

[0039] S7.2. Concrete pouring: Use a concrete pump truck to pour concrete into the reinforcement nodes and vibrate with an inserted vibrator for 20-30 seconds per point to ensure there are no bubbles and honeycombs. After pouring, level the concrete surface.

[0040] Preferably, the implementation steps of step S8 are:

[0041] S8.1. Preparation for curing: Cover the poured concrete surface with wet sacks, ensuring uniform coverage;

[0042] S8.2. Curing process: Use a sprinkler to initially moisten the wet sacks to ensure that they are completely wet. During the 7-day curing period, sprinkle water regularly to keep the sacks moist to prevent the concrete surface from drying out and cracking. Ensure that the concrete surface temperature is appropriate during the curing period and there is no sudden temperature change;

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

[0044] Preferably, the implementation steps of step S9 are:

[0045] S9.1. Concrete strength test: Use a rebound hammer to conduct preliminary strength test on the concrete of the reinforced nodes. If the preliminary test results need further confirmation, use a core drill to take samples and send them to the laboratory for detailed testing. Based on the test results, evaluate whether the concrete strength meets the C30 design requirements;

[0046] S9.2. Inspection of steel bar connection quality: visually inspect the steel bar connection points to ensure that there are no obvious defects, use an ultrasonic flaw detector to perform non-destructive inspection on the welding points to check for internal defects, and use a weld detector to inspect the length and quality of the weld to ensure that the weld length is ≥10cm and the quality meets the standards;

[0047] S9.3. Node overall stability test: Install strain gauges at the reinforced nodes, conduct load tests, record strain data, use load testers to apply design loads to the reinforced nodes, test the deformation and stability of the nodes under loads, 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 standards, sign the acceptance documents and complete the acceptance of the reinforced nodes.

[0049] Compared with the prior art, the present invention has the following beneficial effects: the present invention adopts modular steel bar components and standardized construction processes, which improves construction efficiency, reduces on-site construction period and labor costs, and uses laser scanners and professional software to accurately record and analyze the geometric shape, steel bar diameter, spacing and corrosion conditions of existing nodes to ensure the scientificity and accuracy of the reinforcement plan. The standardized modular steel bar component design ensures that the dimensional accuracy of the steel bar component is controlled within ±1mm, and HRB500 high-strength steel is used to effectively extend the service life and reduce maintenance costs. The construction operation process uses a laser level and expansion bolts to ensure the precise positioning and firm fixation of the formwork and steel bar components. Concrete pouring and maintenance use C30 strength concrete, and an inserted vibrator is used to ensure the quality of concrete pouring and avoid bubbles and honeycombs. The quality inspection and acceptance process includes multiple inspection measures such as concrete strength test, steel bar connection quality inspection and node overall stability test to ensure that the reinforcement effect meets the design requirements and the comprehensive recording and reporting of national standard inspection data, thereby ensuring the traceability and qualification of the construction quality. DETAILED DESCRIPTION

[0050] Example 1

[0051] The present invention provides a modular steel bar node reinforcement method, comprising the following steps:

[0052] S1. Site survey and node analysis:

[0053] S1.1. Site survey: Use a laser scanner to conduct a comprehensive scan of the structure, record the spatial position 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 a site survey report;

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

[0055] S2. Design and manufacture standardized modular reinforcement components:

[0056] S2.1. Design of steel bar components: Use AutoCAD and SolidWorks to carry out detailed design of steel bar components, determine the steel bar diameters to be 12 mm, 16 mm, 20 mm and the node spacing to be 300 mm in width and 500 mm in length, design standardized connectors, use bolt connections or quick-connect connectors, ensure that the dimensional error is controlled within ±1 mm, design epoxy coating or hot-dip galvanizing for rust prevention, and the coating thickness should be ≥100 μm;

[0057] S2.2. Steel bar processing: Use HRB500 high-strength steel bars, cut the steel bars according to the design specifications, use CNC bending machines to process the steel bars into the designed shape, ensure that the processing accuracy is within ±1mm, and perform epoxy coating or hot-dip galvanizing on the processed steel bars to ensure that the coating thickness is ≥100μm;

[0058] S3. Clean up the node areas that need to be reinforced:

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

[0060] S3.2. Expose 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 the rock drill to ensure that only the loose part is removed without damaging the structural layer. Clean up the debris produced by the rock drill and keep the work area clean.

[0061] S4. Install the 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 template, ensure that the positioning error is ≤ 2mm, initially fix the template at the reinforcement position, and check the position accuracy;

[0063] S4.2. Template fixing: Use a drilling machine to drill holes at fixed positions 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. Installation of prefabricated modular reinforcement components:

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

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

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

[0068] S6. Install the formwork for pouring:

[0069] S6.1. Formwork preparation: Cut the steel formwork according to the shape of the reinforcement node, adjust the position of the formwork to make it match the shape of the reinforcement node, and initially fix the formwork at the reinforcement position;

[0070] S6.2. Template fixing: Use a drilling machine to drill holes at fixed positions 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. Pouring concrete for reinforced nodes:

[0072] S7.1. Concrete preparation: Mix concrete according to a water-cement ratio of 0.45, use a concrete mixer to mix, ensure the concrete is uniform, check the fluidity and uniformity of the concrete, and ensure that the quality meets the requirements;

[0073] S7.2. Concrete pouring: Use a concrete pump truck to pour concrete to the reinforcement nodes and use an inserted vibrator to vibrate for 20-30 seconds per point to ensure that there are no bubbles or honeycombs. After pouring, level the concrete surface;

[0074] S8. Curing of poured concrete:

[0075] S8.1. Preparation for curing: Cover the poured concrete surface with wet sacks, ensuring uniform coverage;

[0076] S8.2. Curing process: Use a sprinkler to initially moisten the wet sacks to ensure that they are completely wet. During the 7-day curing period, sprinkle water regularly to keep the sacks moist to prevent the concrete surface from drying out and cracking. Ensure that the concrete surface temperature is appropriate during the curing period and there is no sudden temperature change;

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

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

[0079] S9.1. Concrete strength test: Use a rebound hammer to conduct preliminary strength test on the concrete of the reinforced nodes. If the preliminary test results need further confirmation, use a core drill to take samples and send them to the laboratory for detailed testing. Based on the test results, evaluate whether the concrete strength meets the C30 design requirements;

[0080] S9.2. Inspection of steel bar connection quality: visually inspect the steel bar connection points to ensure that there are no obvious defects, use an ultrasonic flaw detector to perform non-destructive inspection on the welding points to check for internal defects, and use a weld detector to inspect the length and quality of the weld to ensure that the weld length is ≥10cm and the quality meets the standards;

[0081] S9.3. Node overall stability test: Install strain gauges at the reinforced nodes, conduct load tests, record strain data, use load testers to apply design loads to the reinforced nodes, test the deformation and stability of the nodes under loads, 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 standards, sign the acceptance documents and complete the acceptance of the reinforced nodes.

[0083] Example 2

[0084] 1. Construction technology:

[0085] In the practical application of modular steel reinforcement for one or some key building nodes to improve the seismic resistance of the structure, the modular steel node reinforcement method specifically includes the following steps:

[0086] (1) Preparation

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

[0088] Material preparation: steel bars, formwork, concrete;

[0089] Personnel training: construction personnel receive operation specification and safety training;

[0090] (2) Steel bar processing

[0091] Rebar cutting: Use a rebar cutting machine to cut the rebar according to the size of the design drawing;

[0092] Steel bar bending: Use a steel bar bending machine to bend the steel bars to ensure that the bending angle and shape meet the design requirements;

[0093] (3) Steel bar binding

[0094] Node location: Determine the reinforcement node location according to the design drawings;

[0095] Tie the steel bars together: Use tie wire to tie the steel bars together firmly to ensure that the nodes are tightly connected;

[0096] (4) Template installation

[0097] Formwork installation: Install the formwork at the reinforcement nodes to ensure that the formwork is firm and prevent leakage;

[0098] Reinforce the formwork: Use steel support 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 and ensure that the concrete is uniform;

[0101] Pouring concrete: Use a vibrator to evenly pour the concrete into the formwork, making sure there are no bubbles;

[0102] (6) Vibrating concrete

[0103] Vibration: Use a vibrator to vibrate the concrete to ensure that the concrete is dense;

[0104] (7) Formwork removal

[0105] Demoulding time: 24 hours after pouring, the first demolding is carried out;

[0106] Formwork removal operation: carefully remove the formwork to ensure that the concrete surface is not damaged;

[0107] (8) Concrete curing

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

[0109] Water regularly: Keep the sacks moist by watering them every day;

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

[0111] Concrete strength testing: Use a rebound hammer and a core drill to test the concrete strength;

[0112] Steel bar connection quality inspection: Use ultrasonic flaw detector and weld detector to inspect steel bar connection quality; Node overall stability inspection: Use strain gauge and load tester to conduct stability inspection;

[0113] Acceptance: Acceptance is carried out based on test results and standards.

[0114] 2. Equipment and engineering parameters:

[0115] In the above construction method, the equipment and equipment parameters are shown in Table 1, and the engineering parameters are shown in Table 2;

[0116] Table 1 Equipment parameters of modular steel bar node reinforcement method

[0117]

[0118]

[0119] Table 2 Engineering parameters of modular steel bar node reinforcement method

[0120]

[0121] 3. Testing:

[0122] According to the detection method in step S9, the strength of the steel bar node after the above reinforcement method is tested, see Table 3;

[0123] Table 3 Various test tables

[0124]

[0125] 4. Comparative acceptance:

[0126] Before acceptance, the strength of the steel bar nodes after the reinforcement method of the present invention was tested, see Table 4;

[0127] Table 4 Acceptance test table

[0128]

[0129] In summary, according to the data recorded in the table, all construction steps and test results are in line with the design and standard requirements, indicating that the modular steel node reinforcement method is effective and meets the GB50204-2002 quality standard.

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

Claims

1. A modular steel bar node reinforcement method, characterized in that: The following steps are involved: S1. Site survey and node analysis, record the conditions of existing nodes, including the diameter, spacing and corrosion degree of steel bars, use laser scanners for precise measurement, use ANSYS or SAP2000 to simulate the node stress state, and determine the location and degree of nodes that need to be reinforced; S2. Design and manufacture standardized modular steel bar components, with steel bar material of HRB500, specifications of 12mm, 16mm, 20mm, node spacing of module width 300mm, length 500mm, standardized connectors, bolt connection or quick plug connector, dimensional error controlled within ±1mm, rust-proof treatment using epoxy coating or hot-dip galvanizing, coating thickness ≥100μm; S3. Clean the node areas that need to be reinforced, remove the surface rust and loose concrete layer, and expose the structural layer; S4. Install the positioning template to ensure the precise position of the modular reinforcement. The template material is steel template with a thickness of ≥20mm. A laser level is used to ensure that the positioning error is ≤2mm. The template is fixed with expansion bolts with a bolt spacing of 500mm. S5. Install the pre-processed modular steel bar components, use steel wire or clips to initially fix the modular steel bars to the original steel bars, with a spacing of 200mm, and weld at least two sides of each joint, with a weld length of ≥10cm, a welding current of 200-300A, and use standardized bolt connections or quick plug connectors, with a bolt torque of 80-100Nm; S6. Install the pouring formwork to ensure the shape of the reinforced nodes. Use steel formwork with a thickness of ≥20mm and a spacing of 500mm. Use expansion bolts to fix the formwork with a bolt spacing of 500mm. S7. Pour the concrete for the reinforced nodes, using C30 strength concrete, water-cement ratio 0.45, using an insert vibrator, vibrating for 20-30 seconds per point, ensuring there are no bubbles or honeycombs; S8. Curing the poured concrete, cover with wet sacks and cure for 7 days, keeping the concrete surface moist during this period; S9. Inspection and acceptance of reinforced nodes, testing of concrete strength, steel bar connection quality and overall node stability, acceptance in accordance with national standard GB50204-2002, to ensure that all indicators meet the design requirements.

2. A modular steel bar node reinforcement method according to claim 1, characterized in that: The implementation steps of step S1 are: S1.

1. Site survey: Use a laser scanner to conduct a comprehensive scan of the structure, record the spatial position 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 a site survey report; S1.

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

3. A modular steel bar node reinforcement method according to claim 2, characterized in that: The implementation steps of step S2 are: S2.

1. Design of steel bar components: Use AutoCAD and SolidWorks to carry out detailed design of steel bar components, determine the steel bar diameters of 12 mm, 16 mm, and 20 mm, and the node spacing of 300 mm in width and 500 mm in length, design standardized connectors, use bolt connections or quick-connect connectors, ensure that the dimensional error is controlled within ±1 mm, design epoxy coating or hot-dip galvanizing anti-rust treatment, and the coating thickness is ≥100 μm; S2.

2. Steel bar processing: Use HRB500 high-strength steel bars, cut the steel bars according to the design specifications, use CNC bending machines to process the steel bars into the designed shape, ensure that the processing accuracy is within ±1mm, and epoxy coat or hot-dip galvanize the processed steel bars to ensure that the coating thickness is ≥100μm.

4. A modular steel bar node reinforcement method according to claim 3, characterized in that: The implementation steps of step S3 are: S3.

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

2. Expose 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 the rock drill to ensure that only the loose part is removed without damaging the structural layer. Clean up the debris produced by the rock drill and keep the working area clean.

5. A modular steel bar node reinforcement method according to claim 4, characterized in that: The implementation steps of step S4 are: 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 template, ensure that the positioning error is ≤ 2mm, initially fix the template at the reinforcement position, and check the position accuracy; S4.

2. Template fixing: Use a drilling machine to drill holes at fixed positions 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. A modular steel bar node reinforcement method according to claim 5, characterized in that: The implementation steps of step S5 are: S5.

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

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

3. Bolt connection: Use standardized bolt connections or quick-connect connectors, install the bolts, tighten the bolts with a wrench, and control the torque to 80-100Nm. Check the tightness of the bolt connection to ensure a firm connection.

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

1. Formwork preparation: Cut the steel formwork according to the shape of the reinforcement node, adjust the position of the formwork to make it match the shape of the reinforcement node, and initially fix the formwork at the reinforcement position; S6.

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

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

1. Concrete preparation: Mix concrete according to a water-cement ratio of 0.45, use a concrete mixer to mix, ensure the concrete is uniform, check the fluidity and uniformity of the concrete, and ensure that the quality meets the requirements; S7.

2. Concrete pouring: Use a concrete pump truck to pour concrete into the reinforcement nodes and vibrate with an inserted vibrator for 20-30 seconds per point to ensure there are no bubbles and honeycombs. After pouring, level the concrete surface.

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

1. Preparation for curing: Cover the poured concrete surface with wet sacks, ensuring even coverage; S8.

2. Curing process: Use a sprinkler to initially moisten the wet sacks to ensure that they are completely wet. During the 7-day curing period, sprinkle water regularly to keep the sacks moist to prevent the concrete surface from drying out and cracking. Ensure that the concrete surface temperature is appropriate during the curing period and there is no sudden temperature change; S8.

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

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

1. Concrete strength test: Use a rebound hammer to conduct preliminary strength test on the concrete of the reinforced nodes. If the preliminary test results need further confirmation, use a core drill to take samples and send them to the laboratory for detailed testing. Based on the test results, evaluate whether the concrete strength meets the C30 design requirements; S9.

2. Inspection of steel bar connection quality: visually inspect the steel bar connection points to ensure that there are no obvious defects, use an ultrasonic flaw detector to perform non-destructive inspection on the welding points to check for internal defects, and use a weld detector to inspect the length and quality of the weld to ensure that the weld length is ≥10cm and the quality meets the standards; S9.

3. Node overall stability test: Install strain gauges at the reinforced nodes, conduct load tests, record strain data, use load testers to apply design loads to the reinforced nodes, test the deformation and stability of the nodes under loads, 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 GB50204-2002 national standards, sign the acceptance documents. Complete the acceptance work of reinforced nodes.

Images