An emergency repair method for a fully prefabricated assembly type steel reinforced concrete structure

Abstract

The application discloses an emergency repair method for a full-precast assembly type steel reinforced concrete structure, and comprises the following steps: 1, determining the position of the type steel reinforced concrete structure impacted; 2, non-destructive testing the position of the type steel reinforced concrete structure impacted; 3, determining the damage level of the position of the type steel reinforced concrete structure impacted; 4, determining the repair and construction scheme corresponding to each damage level; 5, determining the specific structure composition of the full-precast impact-resistant type steel reinforced concrete column, beam and wall structure. The application divides the damage of the type steel reinforced concrete structure into four levels by means of artificial visual observation and non-destructive testing of the type steel reinforced concrete structure impacted, in combination with the ratio of the actual impact force and the shear capacity of the oblique section, so that different emergency repair schemes can be formulated according to different damage conditions, the engineering facility use function can be quickly restored, and the use safety of the engineering structure can be ensured.

Description

Technical Field

[0001] This invention belongs to the field of tunnel engineering blasting construction technology, specifically relating to an emergency repair method for a fully prefabricated assembled steel-concrete structure. Background Technology

[0002] Rapid repair and construction, coupled with structural forms possessing high load-bearing capacity and impact resistance, are crucial for emergency repair and construction in national defense engineering. Various engineering facilities, such as surface civilian or military facilities, underground protective structures, and civil defense projects, are highly susceptible to damage from impacts by objects or explosives. When structural components are damaged and their load-bearing capacity is insufficient, emergency repairs are necessary to quickly restore the functionality of the facility and ensure the safety of the structure. Therefore, how to quickly and conveniently replace structural components or rebuild the entire structure has become an urgent problem to be solved.

[0003] Currently, emergency repair and reconstruction of engineering structures mainly adopts two categories: partially precast concrete structures and fully precast steel structures. Partially precast concrete structures have significant drawbacks, such as difficulty in connecting precast and cast-in-place parts, low joint bearing capacity, heavy structural self-weight, complex construction, diverse component and joint forms, and high construction difficulty under various scenarios. Fully precast steel structures have poor impact resistance, diverse component and joint forms, complex connection methods, poor environmental adaptability, poor fire resistance, and structural instability, making it difficult to meet the needs of national defense engineering preparedness. Summary of the Invention

[0004] The technical problem to be solved by this invention is to address the shortcomings of the prior art by providing an emergency repair method for a fully prefabricated steel-concrete composite structure. This method involves visual observation and non-destructive testing of the impacted steel-concrete composite structure, and combining the actual impact force with the ratio of the shear capacity of the inclined section to classify the damage to the steel-concrete composite structure into four levels. This facilitates the development of different emergency repair plans based on different damage levels, enabling the rapid restoration of the functionality of the engineering facilities while ensuring the safety of the engineering structure.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: an emergency repair method for a fully prefabricated assembled steel-concrete structure, characterized in that the method includes the following steps:

[0006] Step 1: Determine the impact location on the steel-concrete composite structure: Based on the type of impact, determine the impact location on the steel-concrete composite structure;

[0007] Step 2: Conduct non-destructive testing on the impact points of the steel-concrete composite structure: Use the rebound method to test the concrete strength at the impact points of the steel-concrete composite structure and calculate its strength loss rate.

[0008] Ultrasonic testing was used to detect the width and depth of cracks inside steel-concrete composite structures.

[0009] Step 3: Determine the damage level at the impact location on the steel-concrete composite structure: This involves considering the concrete strength loss rate, crack width and depth at the damaged location, and the actual impact force. and shear capacity of inclined section The ratio of the damage level at the impact point on the steel-concrete composite structure is used to classify the damage level into four grades: S1 (minor damage), S2 (moderate damage), S3 (severe damage), and S4 (severe damage).

[0010] Step 4: Determine the emergency repair and reconstruction plan corresponding to each damage level: When the damage level of the impact location on the steel-concrete structure is S1 level minor damage, repair the surface of the damaged components in the steel-concrete structure.

[0011] When the damage level at the impact point on the steel-concrete composite structure is S2 level moderate damage, the damaged component surface in the steel-concrete composite structure shall be repaired and reinforced.

[0012] When the damage level of the impact location on the steel-concrete structure is S3 level severe damage, the damaged columns, beams or wall structures in the steel-concrete structure shall be demolished and replaced with fully precast impact-resistant steel-concrete columns, fully precast impact-resistant steel-concrete beams or fully precast impact-resistant steel-concrete wall structures.

[0013] When the damage level of the impact location on the steel-concrete structure is S4 level severe damage, the entire steel-concrete structure will be demolished and rebuilt using fully prefabricated impact-resistant steel-concrete columns, beams and walls.

[0014] Step 5: Determine the specific structural composition of the fully prefabricated impact-resistant steel-concrete columns, beams and walls: The fully prefabricated impact-resistant steel-concrete wall structure includes multiple foundation components arranged side by side, and the right-angle slots of two adjacent foundation components in the wall structure are interlocked with each other.

[0015] The fully prefabricated impact-resistant steel-concrete beam or column includes one or more coaxially arranged foundation components, and the fully prefabricated impact-resistant steel-concrete beam and column are connected by connection nodes.

[0016] When a fully precast impact-resistant steel-concrete beam or column includes multiple foundation components, two adjacent foundation components are connected by a connection node.

[0017] The basic components include steel-concrete composite components and multiple right-angle slots embedded around the steel-concrete composite components. The cross-section of the steel-concrete composite components is rectangular. The right-angle slots are arranged along the length of the steel-concrete composite components. An end plate is provided at each end of the steel-concrete composite components. The steel-concrete composite components include a concrete structure main body and steel sections embedded inside the concrete structure main body.

[0018] The connection node and the end plate of the foundation component connected thereto are connected by high-strength bolts.

[0019] The above-mentioned emergency repair method for a fully prefabricated assembled steel-concrete structure is characterized in that: multiple right-angle slots are respectively provided on the four sides of the steel-concrete component, one right-angle side of the right-angle slot is vertically embedded in the steel-concrete component, and the other right-angle side of the right-angle slot extends to the outside of the end plate.

[0020] The above-mentioned emergency repair method for a fully prefabricated assembled steel-concrete structure is characterized in that: the connection node includes a cubic shell and a cross stiffening rib disposed in the cubic shell; each side of the cubic shell is provided with a plurality of bolt holes for high-strength bolts to pass through; the cross stiffening rib is provided with through holes that match the bolt holes; and the end plate is provided with a plurality of bolt connection holes for high-strength bolts to connect.

[0021] The above-mentioned emergency repair method for a fully prefabricated steel-concrete composite structure is characterized by: in step three, the maximum value of the shear bearing capacity of the inclined section. Satisfy the following formula:

[0022] ;

[0023] in, This refers to the tensile strength of concrete in impact-exposed components of a steel-concrete composite structure. The width of the cross-section of the impacted component. The shear strength of the stirrups in the impact-bearing member. The spacing of stirrups in the impact-bearing component. The equivalent tensile strength of the steel section of the impact-bearing component. The total cross-sectional area of ​​all legs of the stirrups in the same section of the impact-bearing component. The thickness of the web of the steel section of the impact-bearing component. The net height of the cross-section of the impacted component. The height of the web of the steel section of the impact member.

[0024] The above-mentioned emergency repair method for a fully prefabricated steel-concrete composite structure is characterized in that: in step three, when the strength loss rate is less than 5%, the crack width is less than or equal to 1 mm, the crack depth is less than or equal to 3 mm, and At that time, it was defined as a minor injury of grade S1;

[0025] When the strength loss rate is greater than or equal to 5% and less than 15%, the crack width is greater than 1 mm and less than or equal to 3 mm, and the crack depth is greater than 3 mm and less than or equal to 5 mm, and At that time, it was classified as S2 level moderate injury;

[0026] When the strength loss rate is greater than or equal to 15% and less than 30%, the crack width is greater than 3mm and less than or equal to 8mm, and the crack depth is greater than 5mm and less than or equal to 25mm, and At that time, it was classified as S3 level severe injury;

[0027] When the strength loss rate is greater than 30%, the crack width is greater than 8 mm, the crack depth is greater than 25 mm, and At that time, it was classified as S4 level severe damage.

[0028] The above-mentioned emergency repair method for a fully prefabricated assembled steel-concrete structure is characterized in that: in step four, when repairing the surface of the damaged components in the steel-concrete structure, the damaged parts of the steel-concrete structure are repaired by polymer repair materials, polymer-modified asphalt, or water-resistant cement grout.

[0029] The above-mentioned emergency repair method for a fully prefabricated steel-concrete composite structure is characterized in that: in step four, when repairing and reinforcing the surface of the damaged components in the steel-concrete composite structure, the surface of the damaged components is repaired first, and then reinforcement components are set on the outside of the repaired components for support or protection.

[0030] Compared with the prior art, the present invention has the following advantages:

[0031] 1. This invention enables the preliminary identification of damaged areas in steel-concrete composite structures through visual observation after impact, thereby providing a basis for subsequent damage assessment and effectively improving work efficiency.

[0032] 2. This invention uses non-destructive testing and ultrasonic detection at the impact location of a steel-concrete composite structure to effectively detect the interior of the structure and further determine the degree of damage.

[0033] 3. This invention combines the concrete strength loss rate, crack width and depth at the damaged location of the steel-concrete composite structure with the ratio of the actual impact force to the shear capacity of the inclined section, and classifies the damage of the steel-concrete composite structure into four levels. This facilitates the development of different emergency repair plans based on different damage conditions, enabling the rapid restoration of the engineering facilities' functionality while ensuring the safety of the engineering structure.

[0034] 4. The basic components of this invention can be assembled into beam, column, and wall structures, thus having a wide range of applications. Due to the detachable and assembleable nature of its basic components, temporary bridges can be quickly repaired and erected in a short time to meet the needs of military operations, making it suitable for wartime bridge repair and construction. The convertible multi-purpose steel-concrete structure can be used for the rapid repair and construction of bridges in wartime. The basic components adopt a steel-concrete structure, which, through different combinations, can provide strong impact resistance and stability, and can be flexibly adjusted according to specific needs. Therefore, it can serve as an underground protective continuous wall to protect underground structures from damage caused by earthquakes, explosions, or other impacts.

[0035] In summary, this invention classifies the damage to steel-concrete composite structures into four levels by conducting manual visual observation and non-destructive testing after impact, and by combining the ratio of the actual impact force to the shear capacity of the inclined section. This facilitates the development of different emergency repair plans based on different damage conditions, enabling the rapid restoration of the functionality of the engineering facilities while ensuring the safety of the engineering structure.

[0036] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0037] Figure 1 This is a flowchart of the present invention.

[0038] Figure 2 This is a schematic diagram of the basic components of the present invention.

[0039] Figure 3 for Figure 2 Top view.

[0040] Figure 4 for Figure 2 AA sectional view.

[0041] Figure 5 This is a schematic diagram of the column structure of the present invention.

[0042] Figure 6 This is a schematic diagram of the connection structure between the beams and columns of the present invention.

[0043] Figure 7This is a schematic diagram of the connection node structure of the present invention.

[0044] Figure 8 This is a schematic diagram of the wall structure of the present invention.

[0045] Figure 9 for Figure 8 BB cross-sectional view.

[0046] Explanation of reference numerals in the attached figures:

[0047] 1—Steel section; 2—Embedded reinforcing bars; 3—Main concrete structure;

[0048] 4—Right-angle slot; 5—End plate; 6—Connecting node;

[0049] 6-1—Cube shell; 6-2—Cross stiffening ribs; 7—High-strength bolts;

[0050] 8— Bolt connection hole. Detailed Implementation

[0051] like Figure 1 The emergency repair method for a fully prefabricated steel-concrete composite structure shown includes the following steps:

[0052] Step 1: Determine the impact location on the steel-concrete composite structure: Based on the type of impact, determine the impact location on the steel-concrete composite structure;

[0053] Meanwhile, the surface damage at the impact location of the steel-concrete composite structure can be preliminarily determined through visual observation. The surface damage can be divided into two categories: severe and non-severe. When the surface of the steel-concrete composite structure is intact or only has cracks, it indicates that the surface damage is not severe. When the surface of the steel-concrete composite structure has cracks, concrete spalling, or breakage, it indicates that the surface damage is severe.

[0054] Step 2: Conduct non-destructive testing on the impact points of the steel-concrete composite structure: Use the rebound method to test the concrete strength at the impact points of the steel-concrete composite structure and calculate its strength loss rate.

[0055] Ultrasonic testing was used to detect the width and depth of cracks inside steel-concrete composite structures.

[0056] In order to improve the repair efficiency, when the surface of the steel-concrete structure is not severely damaged, it is not necessary to use ultrasonic testing to detect the width and depth of cracks inside the steel-concrete structure. When the surface of the steel-concrete structure is severely damaged, ultrasonic testing is used to detect whether there are cracks inside the foundation components and to detect the width and depth of the cracks.

[0057] Step 3: Determine the damage level at the impact location on the steel-concrete composite structure: This involves considering the concrete strength loss rate, crack width and depth at the damaged location, and the actual impact force. and shear capacity of inclined section The ratio of the damage level at the impact point on the steel-concrete composite structure is used to classify the damage level into four grades: S1 (minor damage), S2 (moderate damage), S3 (severe damage), and S4 (severe damage).

[0058] Step 4: Determine the emergency repair and reconstruction plan corresponding to each damage level: When the damage level of the impact location on the steel-concrete structure is S1 level minor damage, repair the surface of the damaged components in the steel-concrete structure.

[0059] When the damage level at the impact point on the steel-concrete composite structure is S2 level moderate damage, the damaged component surface in the steel-concrete composite structure shall be repaired and reinforced.

[0060] When the damage level of the impact location on the steel-concrete structure is S3 level severe damage, the damaged columns, beams or wall structures in the steel-concrete structure shall be demolished and replaced with fully precast impact-resistant steel-concrete columns, fully precast impact-resistant steel-concrete beams or fully precast impact-resistant steel-concrete wall structures.

[0061] When the damage level of the impact location on the steel-concrete structure is S4 level severe damage, the entire steel-concrete structure will be demolished and rebuilt using fully prefabricated impact-resistant steel-concrete columns, beams and walls.

[0062] Step 5: Determine the specific structural composition of the fully prefabricated impact-resistant steel-concrete columns, beams and walls: The fully prefabricated impact-resistant steel-concrete wall structure includes multiple foundation components arranged side by side, and the right-angle slots 4 of two adjacent foundation components in the wall structure are interlocked with each other.

[0063] The fully prefabricated impact-resistant steel-concrete beam or column includes one or more coaxially arranged foundation components, and the fully prefabricated impact-resistant steel-concrete beam and column are connected by connection node 6.

[0064] When a fully precast impact-resistant steel-concrete beam or column includes multiple foundation components, two adjacent foundation components are connected by a connection node 6.

[0065] The basic components include steel-concrete composite components and multiple right-angle slots 4 embedded around the steel-concrete composite components. The cross-section of the steel-concrete composite components is rectangular. The right-angle slots 4 are arranged along the length of the steel-concrete composite components. An end plate 5 is provided at each end of the steel-concrete composite components. The steel-concrete composite components include a concrete structure body 3 and steel sections 1 embedded inside the concrete structure body 3.

[0066] The connection node 6 and the end plate 5 of the foundation component connected thereto are connected by high-strength bolts 7.

[0067] In practical use, by pre-embedding multiple right-angle slots 4 on the periphery of the steel-concrete composite member, it is convenient to connect multiple foundation members side by side through the right-angle slots 4. This allows the foundation members to be used as beams and columns, as well as as wall structures. This can effectively reduce the types of components in prefabricated buildings. At the same time, different combination forms can be used to meet different building needs, which can effectively shorten the construction cycle and improve construction efficiency and quality.

[0068] In specific implementation, an end plate 5 is provided at each end of the steel-concrete composite member to facilitate the end connection when the foundation member is used as a beam or column. Two adjacent foundation members are connected by high-strength bolts 7 and connection nodes 6, which facilitates the installation and disassembly of the foundation members and makes it easier to replace and repair damaged or outdated members.

[0069] It should be noted that the basic components can be assembled into beams, columns, and wall structures, thus having a wide range of applications. Due to the detachable and assembleable nature of its basic components, temporary bridges can be quickly repaired and erected in a short time to meet the needs of military operations, making it suitable for wartime bridge repair and construction. Convertible multi-purpose steel-concrete composite structures can be used for the rapid repair and construction of bridges in wartime. The basic components utilize steel-concrete composite structures, which, through different combinations, can provide strong impact resistance and stability, and can be flexibly adjusted according to specific needs. Therefore, they can serve as underground protective continuous walls to protect underground structures from damage caused by earthquakes, explosions, or other impacts.

[0070] In practical implementation, by combining basic components in different ways, the following problems can be solved: 1. Structural adaptability: Through different combination methods, convertible multi-purpose steel-concrete composite structures can adapt to different building needs, including high-rise buildings, large-span buildings, and locations subjected to lateral pressure. 2. Construction efficiency: Due to the detachable and assembleable nature of its components, convertible multi-purpose steel-concrete composite structures can achieve rapid construction and assembly, shortening the construction cycle. 3. Convenience of maintenance: The replaceable component characteristics of convertible multi-purpose steel-concrete composite structures make maintenance more convenient, allowing for the rapid replacement of damaged or outdated components, reducing maintenance time and costs. 4. Emergency response capability: In wartime or emergency situations, convertible multi-purpose steel-concrete composite structures can quickly erect or repair temporary facilities, providing timely support and protection. In summary, convertible multi-purpose steel-concrete composite structures have a wide range of application technologies and can achieve vertical, horizontal, and parallel combinations to solve building needs and problems in different scenarios.

[0071] In practice, the concrete main body 3 is equipped with embedded steel bars 2, and the steel section 1 is located at the center of the embedded steel bars 2. The two ends of the steel section 1 are flush with the two ends of the concrete main body 3.

[0072] It should be noted that by visually observing the impacted steel-concrete structure, the damaged parts and extent of the damage can be preliminarily determined, which can effectively provide a basis for subsequent damage assessment and improve work efficiency.

[0073] In practice, non-destructive testing is performed on the impacted locations of the steel-concrete composite structure. Meanwhile, based on the damage assessment by human vision, ultrasonic testing is conducted on severely damaged locations. This approach can effectively probe the interior of the steel-concrete composite structure and further determine the extent of damage.

[0074] In practice, the damage to steel-concrete composite structures is classified into four levels based on factors such as the surface damage, concrete strength loss rate, crack width and depth, and the ratio of actual impact force to shear capacity of the inclined section. This allows for the development of different emergency repair plans based on the different damage conditions, ensuring the rapid restoration of the functionality of the engineering facilities while also guaranteeing the safety of the engineering structure.

[0075] In practice, in step three, the strength loss rate is expressed as the ratio of the concrete design strength to the actual strength.

[0076] In specific implementation, in step four, the peak impact force is the measured value of the impact force of the impactor when the steel-concrete composite structure is impacted. This measured value is determined by the mass and velocity of the impactor.

[0077] In practice, when the damage level at the impact point on the steel-concrete composite structure is S1 level minor damage, the repair plan is as follows:

[0078] Step a, Cleaning and preparation: Remove oil, dust and other debris around the crack; remove the original protective layer to expose the concrete surface; groove and chisel the crack to create a V-shaped groove to increase the adhesion and filling properties of the repair material.

[0079] Step b, filling cracks: Use high-strength and durable repair materials such as polymer repair materials, polymer-modified asphalt, and water-resistant cement grout to inject into the V-shaped groove to fill the cracks; the filling depth should be greater than or equal to 1.5 times the crack width to ensure that the repair material is fully filled and has good adhesion to the original concrete structure. The selection of repair materials should be based on the actual situation and the assessment of the structural engineer.

[0080] Step c, Preventing cracks from recurring: Problems that cause cracks, such as uneven structural stress or moisture penetration, should be repaired and addressed promptly; strengthen structural monitoring and regular maintenance to promptly identify and repair problems that may lead to crack formation; after repair, enhance the construction quality of the protective layer to ensure that the protective layer on the concrete surface is firm and dense.

[0081] When the damage level at the impact point of a steel-concrete composite structure is S2 level (moderate damage), the specific repair and reinforcement plan is as follows:

[0082] Step d, cleaning and preparation: Remove loose protective concrete and loosely adhered materials; before repairing shear diagonal cracks, ensure the surface is dry and clean, and remove oil, dust, etc. that may affect the adhesion of the repair materials;

[0083] Step e, Repairing shear diagonal cracks: Use high-strength repair materials such as polymer repair materials, polymer-modified asphalt, and water-resistant cement grout. Select appropriate repair materials and repair methods such as injection, smearing, or spraying according to the specific crack width and depth to ensure that the repair materials bond well with the original concrete structure and restore the repaired part to its original strength and stiffness.

[0084] Step f: Reinforce the steel-concrete composite column: Reinforce the steel-concrete composite column to increase its load-bearing capacity and shear resistance; reinforcement methods include reinforcing with steel plates, wrapping the steel column, and adding external shear walls.

[0085] Step g: After the repair is completed, strengthen the construction quality of the protective layer to ensure that the protective layer on the concrete surface is firm and dense;

[0086] Step h: Strengthen structural monitoring and regular maintenance to promptly identify and repair problems that may lead to the formation of shear cracks, such as uneven structural stress and moisture penetration.

[0087] When the impact damage to a steel-concrete composite structure is classified as S3 (severe damage), the process for removing and replacing the damaged components is as follows:

[0088] Step i, Determine the scope of replacement: Based on the assessment results, determine the specific components that need to be replaced, such as the spalled concrete, severely deformed steel bars, and misaligned impact areas.

[0089] Step j: Remove damaged components: For components that need to be replaced, carry out safe removal work;

[0090] Step k, Fabrication and installation of new components: Using basic components and connection nodes, install the new components according to the connection methods of beams, columns and walls, and reinforce them appropriately.

[0091] like Figure 2 and Figure 4 As shown in this embodiment, the four sides of the steel-concrete composite member are provided with a plurality of right-angle slots 4. One right-angle side of the right-angle slot 4 is vertically embedded in the steel-concrete composite member, and the other right-angle side of the right-angle slot 4 extends to the outside of the end plate 5.

[0092] In actual use, the end plate 5 is perpendicular to the steel section 1, and the ends of the end plate 5 and the steel section 1 are welded together. The two ends of the right-angle slot 4 are welded to the two end plates 5 respectively. The end plate 5 is a rectangular steel plate, and the center of the end plate 5 is collinear with the center line of the concrete structure body 3.

[0093] In practice, the right-angle slot 4 is an angle steel pre-embedded in the steel-concrete composite member; when two adjacent foundation members are connected side by side, the side walls of the end plates 5 at the ends of the two adjacent foundation members are tightly fitted together.

[0094] like Figure 3 and Figure 7 As shown, in this embodiment, the connecting node 6 includes a cubic shell 6-1 and a cross stiffening rib 6-2 disposed inside the cubic shell 6-1. Each side of the cubic shell 6-1 is provided with a plurality of bolt holes for high-strength bolts 7 to pass through. The cross stiffening rib 6-2 is provided with through holes that match the bolt holes. The end plate 5 is provided with a plurality of bolt connection holes 8 for high-strength bolts 7 to be connected.

[0095] In actual use, the cross stiffening rib 6-2 is welded and fixed to the cubic shell 6-1.

[0096] It should be noted that the two ribs of the cross stiffening rib 6-2 are parallel to the two side plates of the cubic shell 6-1, respectively.

[0097] In practice, the bolt holes on the two opposite side plates of the cubic shell 6-1 are positioned correspondingly, thus facilitating the passage of the high-strength bolts 7 through the entire connection node 6. The high-strength bolts connecting the cubic shell 6-1 in the three directions are staggered.

[0098] In actual use, the bolt connection holes opened on the end plate 5 are located on the outside of the concrete structure body 3, which makes it easier for construction personnel to install and remove high-strength bolts 7 in the gap of the right-angle slot 4.

[0099] In specific implementation, such as Figure 8 and Figure 9 As shown, when assembling the wall structure, multiple basic components are arranged side by side, and the right-angle slots on two adjacent basic components are interlocked.

[0100] like Figure 5 As shown, when extending a column or beam, two or more foundation components are arranged sequentially on the same straight line. High-strength bolts 7 and connecting nodes 6 are used to connect two adjacent foundation components. The two adjacent foundation components are respectively attached to the two side walls arranged opposite to each other on the connecting node 6.

[0101] like Figure 6 As shown, when connecting beams and columns, the two foundation components are arranged vertically, and high-strength bolts 7 and connection nodes 6 are used to connect the two foundation components. The two foundation components are respectively attached to the two adjacent side walls arranged on the connection node 6.

[0102] In this embodiment, in step four, the maximum value of the shear capacity of the inclined section... Satisfy the following formula:

[0103] ;

[0104] in, This refers to the tensile strength of concrete in impact-exposed components of a steel-concrete composite structure. The width of the cross-section of the impacted component. The shear strength of the stirrups in the impact-bearing member. The spacing of stirrups in the impact-bearing component. The equivalent tensile strength of the steel section of the impact-bearing component. The total cross-sectional area of ​​all legs of the stirrups in the same section of the impact-bearing component. The thickness of the web of the steel section of the impact-bearing component. The net height of the cross-section of the impacted component. The height of the web of the steel section of the impact member.

[0105] In this embodiment, in step four, when the strength loss rate is less than 5%, the crack width is less than or equal to 1 mm, the crack depth is less than or equal to 3 mm, and At that time, it was defined as a minor injury of grade S1;

[0106] When the strength loss rate is greater than or equal to 5% and less than 15%, the crack width is greater than 1 mm and less than or equal to 3 mm, and the crack depth is greater than 3 mm and less than or equal to 5 mm, and At that time, it was classified as S2 level moderate injury;

[0107] When the strength loss rate is greater than or equal to 15% and less than 30%, the crack width is greater than 3mm and less than or equal to 8mm, and the crack depth is greater than 5mm and less than or equal to 25mm, and At that time, it was classified as S3 level severe injury;

[0108] When the strength loss rate is greater than 30%, the crack width is greater than 8 mm, the crack depth is greater than 25 mm, and At that time, it was classified as S4 level severe damage.

[0109] In this embodiment, in step five, when repairing the surface of the damaged components in the steel-concrete structure, the damaged areas of the steel-concrete structure are repaired using polymer repair materials, polymer-modified asphalt, or water-resistant cement grout.

[0110] In practical applications, when repairing cracks on the surface of damaged components in steel-concrete composite structures, a V-groove is first opened at the crack on the surface of the damaged component, and then polymer repair material, polymer-modified asphalt, or water-resistant cement grout is injected into the V-groove to fill the crack.

[0111] In this embodiment, in step five, when repairing and reinforcing the damaged surface of the steel-concrete structure, the damaged surface of the component is repaired first, and then a reinforcing component is installed on the outside of the repaired component for support or protection.

[0112] In practical use, when reinforcing components are installed on the outside of the repaired component for support or protection, reinforcement can be carried out by installing reinforcing steel plates, wrapping protective layers, or adding shear walls on the outside of the repaired component, depending on the damaged area.

[0113] In specific implementation, when the steel-concrete structure is assembled from fully prefabricated impact-resistant steel-concrete columns, beams, and walls, and the damaged part is part of the column, loosen the high-strength bolts 7 between the impact-damaged foundation component and the connection node 6; remove the impact-damaged upper or lower foundation component; replace the damaged connection node 6, and reinstall the connection node 6 before the lower foundation component; replace the damaged upper or lower foundation component; and connect the high-strength bolts 7 through the connection node 6 to the upper and lower foundation components.

[0114] When the damaged part is the beam-column connection, loosen the high-strength bolts 7 between the impact-damaged foundation component and the connection node 6; remove the impact-damaged horizontal or vertical foundation component; replace the damaged connection node 6, and reinstall the connection node 6 before the vertical foundation component; replace the damaged horizontal or vertical foundation component; connect the high-strength bolts 7 through the connection node 6 to the horizontal and vertical foundation components.

[0115] When the damaged part is the wall structure, loosen the connection node 6 and remove the top horizontal beam; pull out the impact-damaged foundation component vertically; replace the damaged foundation component; and connect it to the top horizontal beam through the connection node 6 with high-strength bolts.

[0116] The above description is merely a preferred embodiment of the present invention and does not constitute any limitation on the present invention. Any simple modifications, alterations, or equivalent structural changes made to the above embodiments based on the technical essence of the present invention shall still fall within the protection scope of the present invention.

Claims

1. An emergency repair method for a fully prefabricated assembled steel-concrete structure, characterized in that, The method includes the following steps: Step 1: Determine the impact location on the steel-concrete composite structure: Based on the type of impact, determine the impact location on the steel-concrete composite structure; Step 2: Conduct non-destructive testing on the impact points of the steel-concrete composite structure: Use the rebound method to test the concrete strength at the impact points of the steel-concrete composite structure and calculate its strength loss rate. Ultrasonic testing was used to detect the width and depth of cracks inside steel-concrete composite structures. Step 3: Determine the damage level at the impact location on the steel-concrete composite structure: This involves considering the concrete strength loss rate, crack width and depth at the damaged location, and the actual impact force. and shear capacity of inclined section The ratio of the damage level at the impact point on the steel-concrete composite structure is used to classify the damage level into four grades: S1 (minor damage), S2 (moderate damage), S3 (severe damage), and S4 (severe damage). Step 4: Determine the emergency repair and reconstruction plan corresponding to each damage level: When the damage level of the impact location on the steel-concrete structure is S1 level minor damage, repair the surface of the damaged components in the steel-concrete structure. When the damage level at the impact point on the steel-concrete composite structure is S2 level moderate damage, the damaged component surface in the steel-concrete composite structure shall be repaired and reinforced. When the damage level of the impact location on the steel-concrete structure is S3 level severe damage, the damaged columns, beams or wall structures in the steel-concrete structure shall be demolished and replaced with fully precast impact-resistant steel-concrete columns, fully precast impact-resistant steel-concrete beams or fully precast impact-resistant steel-concrete wall structures. When the damage level of the impact location on the steel-concrete structure is S4 level severe damage, the entire steel-concrete structure will be demolished and rebuilt using fully prefabricated impact-resistant steel-concrete columns, beams and walls. Step 5: Determine the specific structural composition of the fully prefabricated impact-resistant steel-concrete columns, beams and walls: The fully prefabricated impact-resistant steel-concrete wall structure includes multiple foundation components arranged in parallel, and the right-angle slots (4) of two adjacent foundation components in the wall structure are interlocked. The fully prefabricated impact-resistant steel-concrete beam or column includes one or more coaxially arranged foundation components, and the fully prefabricated impact-resistant steel-concrete beam and column are connected by a connection node (6). When a fully precast impact-resistant steel-concrete beam or column includes multiple foundation components, two adjacent foundation components are connected by a connection node (6). The basic components include steel-concrete composite components and multiple right-angle slots (4) embedded around the steel-concrete composite components. The cross-section of the steel-concrete composite components is rectangular. The right-angle slots (4) are arranged along the length of the steel-concrete composite components. An end plate (5) is provided at each end of the steel-concrete composite components. The steel-concrete composite components include a concrete structure body (3) and steel sections (1) embedded inside the concrete structure body (3). The connection node (6) and the end plate (5) of the foundation component connected thereto are connected by high-strength bolts (7).

2. The emergency repair method for a fully prefabricated assembled steel-concrete structure according to claim 1, characterized in that: The four sides of the steel-concrete composite member are provided with multiple right-angle slots (4). One right-angle side of the right-angle slot (4) is vertically embedded in the steel-concrete composite member, and the other right-angle side of the right-angle slot (4) extends to the outside of the end plate (5).

3. The emergency repair method for a fully prefabricated assembled steel-concrete structure according to claim 1, characterized in that: The connection node (6) includes a cubic shell (6-1) and a cross stiffening rib (6-2) disposed in the cubic shell (6-1). Each side of the cubic shell (6-1) is provided with a plurality of bolt holes for high-strength bolts (7) to pass through. The cross stiffening rib (6-2) is provided with through holes that match the bolt holes. The end plate (5) is provided with a plurality of bolt connection holes (8) for high-strength bolts (7) to be connected.

4. The emergency repair method for a fully prefabricated assembled steel-concrete structure according to claim 1, characterized in that: In step three, when the strength loss rate is less than 5%, the crack width is less than or equal to 1 mm, the crack depth is less than or equal to 3 mm, and At that time, it was defined as a minor injury of grade S1; When the strength loss rate is greater than or equal to 5% and less than 15%, the crack width is greater than 1 mm and less than or equal to 3 mm, and the crack depth is greater than 3 mm and less than or equal to 5 mm, and At that time, it was classified as S2 level moderate injury; When the strength loss rate is greater than or equal to 15% and less than 30%, the crack width is greater than 3mm and less than or equal to 8mm, and the crack depth is greater than 5mm and less than or equal to 25mm, and At that time, it was classified as S3 level severe injury; When the strength loss rate is greater than 30%, the crack width is greater than 8 mm, the crack depth is greater than 25 mm, and At that time, it was classified as S4 level severe damage.

5. An emergency repair method for a fully prefabricated assembled steel-concrete structure according to claim 1, characterized in that: In step four, when repairing the damaged surface of the steel-concrete composite structure, polymer repair materials, polymer-modified asphalt, or water-resistant cement grout are used to repair the damaged areas of the steel-concrete composite structure.

6. The emergency repair method for a fully prefabricated assembled steel-concrete structure according to claim 1, characterized in that: In step four, when repairing and reinforcing the damaged surface of the steel-concrete composite structure, the damaged surface of the component is repaired first, and then a reinforcing component is installed on the outside of the repaired component for support or protection.

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