A reinforcement model and method for circumferentially active-constrained corrosion-resistant reinforced concrete (RC) columns.

Abstract

This invention discloses a reinforcement model and method for corroded reinforced concrete (RC) columns based on circumferential active constraint, belonging to the field of building structure technology. The reinforcement model includes multiple circumferential shells fitted around the corroded RC column and connected by shaped channel steel; a telescopic frame located between the column body and the circumferential shells; and circumferential constraint members slidably connected to the telescopic frame and penetrating the shaped channel steel. The telescopic frame includes a circumferential movable limiting frame with elastic damping elements and an axial fixing frame. This invention addresses the problems of delayed constraint, insufficient corrosion protection, and poor collapse resistance in existing corroded RC column reinforcement methods. By splicing circumferential shells with shaped channel steel, and with the circumferential constraint members tensioned, active constraint forces are transmitted along the telescopic frame and the shaped channel steel, thus suppressing deformation of the corroded RC column in advance. The telescopic frame adapts to the cross-section of the corroded RC column, and the elastic damping elements dissipate circumferential load energy, effectively improving adaptability, corrosion resistance, and collapse resistance. It is suitable for RC column reinforcement in corrosive environments.

Description

Technical Field

[0001] This invention belongs to the field of building structure technology, specifically a reinforcement model and reinforcement method for RC columns based on circumferential active constraint corrosion. Background Technology

[0002] As the core vertical load-bearing components of frame structures, reinforced concrete (RC) columns directly determine the safety and service life of the overall building structure through their mechanical properties and long-term durability. In highly corrosive environments such as saline soil and coastal areas, RC columns are subject to long-term erosion from multiple physicochemical processes, including chloride ion penetration, freeze-thaw cycles, and alternating wet and dry conditions, which easily leads to a series of defects: cracking and spalling of the concrete surface due to the failure of the bond between aggregates and cementitious materials; corrosion of longitudinal and stirrup reinforcement resulting in a reduction in the effective bearing area of ​​the cross-section; and even irregular deformations such as corner damage and local depressions in the cross-section. These defects significantly reduce the lateral stiffness and vertical load-bearing capacity of the columns, making them prone to instability and brittle failure under axial pressure or horizontal loads (such as earthquakes and wind loads), and in severe cases, even causing the entire structure to collapse, posing a significant threat to building safety. Therefore, it is urgent to carry out efficient reinforcement and repair of corroded RC columns during their service life.

[0003] Current mainstream RC column reinforcement technology focuses on "improving load-bearing capacity," but it has significant limitations in terms of adaptability to corrosive environments, construction efficiency, and long-term reliability.

[0004] ①Inherent defects of traditional reinforcement methods: The cross-section enlargement method expands the column cross-section by setting up formwork on site and pouring ordinary concrete. Although it can improve the bearing capacity, it has the problem of "fat beams and thick columns". Moreover, the interface between the old and new concrete is prone to forming micro-cracks due to insufficient compaction. Corrosive media such as chloride ions can still penetrate into the original column and cause continuous deterioration. The steel wrapping method forms a circumferential constraint by wrapping the column with steel. However, its constraint is a passive constraint. It can only generate effective constraint force after the RC column undergoes significant lateral deformation. At this time, micro-cracks or even macro-damage have already appeared inside the component. In addition, if the interface between steel and concrete is not treated with anti-corrosion, the steel is prone to corrosion due to moisture accumulation. The rust expansion stress further leads to cracking and peeling of the outer concrete. Although the anchoring and rebar method can enhance the bonding between the old and new structure interfaces, it relies on cumbersome procedures such as drilling and grouting on site. The construction efficiency is low. Moreover, it does not design a special anti-corrosion structure for the corrosive environment. The reinforced column still faces the risk of gradual degradation of mechanical properties.

[0005] ② Limitations of UHPC-related reinforcement technologies: With the development of ultra-high performance concrete (UHPC), its high density, high durability, and excellent mechanical properties have provided a new direction for the reinforcement of reinforced concrete columns. However, existing UHPC application technologies have not yet overcome key bottlenecks. For example, the invention patent application with publication number CN117449533A discloses an externally wrapped prestressed steel strand-UHPC composite reinforcement method for reinforced concrete columns. This method utilizes the UHPC sheath to reduce the added cross-sectional dimensions and combines the high tensile strength of stainless steel strands to achieve active restraint, thus improving to some extent the problems of "fat beams and thick columns" and the lag in restraint of traditional methods. However, this solution still has significant shortcomings: the UHPC enclosure requires on-site formwork erection and pouring, which is a complicated construction process and has high requirements for on-site working conditions; it lacks a scalable and adjustable structural design, making it unable to flexibly adapt to RC columns with irregular cross-sectional deformation caused by corrosion; the active constraint relies solely on the coordination of steel strands and anchor bolts, without considering the damping energy dissipation design between the reinforcement system and the original column, resulting in limited improvement in the column's ductility and anti-collapse capacity under horizontal loads, and the interface bonding reliability between the UHPC enclosure and the original corroded RC column is insufficient, leaving potential pathways for corrosive media intrusion.

[0006] In summary, current corrosion-resistant reinforced concrete (RC) column reinforcement technologies generally suffer from four major limitations: ① The lack of a scalable and adjustable structural design makes it difficult to flexibly address irregular cross-sectional deformations (such as local depressions or corner damage) or dimensional differences in corrosion-resistant RC columns, resulting in weak universality of reinforcement; ② Although some technologies use UHPC or stainless steel materials to improve local durability, they have not formed an integrated design of "reinforcement-corrosion isolation-energy dissipation," and there is still a risk of corrosion medium intrusion paths or the degradation of the reinforcement system itself, making it difficult to guarantee long-term reliability; ③ Existing active restraint technologies mostly focus on improving bearing capacity, neglecting the improvement of column ductility through damping energy dissipation, making it difficult to meet the anti-collapse requirements under extreme conditions such as strong earthquakes.

[0007] Therefore, developing a corrosion-resistant RC column reinforcement technology that combines high prefabrication, strong adaptability, full-cycle corrosion protection, and "active constraint-damping energy dissipation" synergistic functions has become an urgent need to solve current engineering pain points and ensure the safe service of RC structures in corrosive environments. Summary of the Invention

[0008] To address the shortcomings of existing reinforcement technologies, such as their inability to adapt to irregular deformations (e.g., corner damage, local depressions) in corroded RC column sections, resulting in weak universality and the lack of active constraint damping energy dissipation mechanisms that make them unsuitable for extreme working conditions, this invention aims to provide a reinforcement model and method for corroded RC columns based on circumferential active constraint. This reinforcement model consists of multiple circumferential shells, a telescopic frame, circumferential constraint components, shaped channel steel, and reinforcing connecting plates. Through a modular, telescopic structure adapting to cross-sectional deformation, circumferential active constraint enhancing load-bearing capacity, UHPC shell and grouting layer blocking corrosion, and elastic damping components achieving a synergistic mechanism for energy dissipation and vibration reduction, this invention solves the problems of poor adaptability, functional fragmentation, and weak collapse resistance in existing technologies.

[0009] The design concept revolves around the core logic of "active constraint - flexible adaptation - full-cycle corrosion protection." Combining the high density and durability advantages of UHPC materials with a modular structural design, the system first utilizes the adjustable characteristics of the telescopic frame (V-shaped movable frame rotating around the corner anchor, telescopic connecting rod length adjustment, and sliding seat sliding along the slide rail connecting plate groove) to achieve a tight fit and dimensional adaptation to the irregular cross-section of the corroded RC column. Then, circumferential constraint components penetrate the shaped channel steel limiting holes and the telescopic frame track to apply active circumferential constraint force, proactively suppressing the lateral deformation of the corroded RC column and avoiding the lag of passive constraint. The system employs a double-layer anti-corrosion barrier, using a circumferential shell as the outer anti-corrosion barrier and internal grouting material to fill the gaps between the shell, frame, and original column, thus blocking the intrusion of corrosive media. Elastic damping components are installed in the telescopic frame to dissipate horizontal load energy through elastic deformation, enhancing the column's ductility and resistance to collapse. Finally, modular designs, such as using shaped channel steel to snap onto the circumferential shell, pre-tightening reinforcing connecting plates, and detachable axial connecting rods, reduce on-site casting and formwork processes, enabling rapid assembly and ultimately constructing an integrated corrosion-resistant RC column reinforcement system that combines adaptation, reinforcement, anti-corrosion, energy dissipation, and assembly.

[0010] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0011] On one hand, this invention provides a reinforcement model for circumferentially active-constrained corrosion-resistant RC columns, comprising:

[0012] Multiple circumferential shells are fitted around the outer periphery of the corroded RC column, and adjacent circumferential shells are connected by special-shaped channel steel.

[0013] The telescopic frame is located between the corroded RC column and the circumferential shell, with its inner wall abutting against the corroded RC column and its outer periphery connected to the circumferential shell;

[0014] The circumferential constraint member, which is slidably connected to the telescopic frame and passes through the special-shaped channel steel, is used to provide a force that causes the circumferential shell and the telescopic frame to tighten synchronously, and to apply an active circumferential constraint force to the corroded RC column.

[0015] Furthermore, the telescopic frame includes:

[0016] Multiple circumferential movable limit frames are connected to the inner wall of the circumferential housing and are slidably connected to the circumferential constraint members;

[0017] An axial fixing bracket is arranged around the outer periphery of the corroded RC column and is slidably connected to multiple circumferential movable limit brackets.

[0018] Furthermore, the circumferential movement limit bracket includes:

[0019] Multiple corner anchors are adapted to connect with the inner corners of multiple circumferential shells;

[0020] Multiple V-shaped movable frames, one end of which is fitted into the corresponding corner anchor and rotatably connected to the corner anchor, and the other end is slidably connected to the axial fixed frame;

[0021] An elastic damping element connects two adjacent V-shaped movable frames.

[0022] Furthermore, the V-shaped movable frame includes:

[0023] An arc-shaped movable plate is fitted inside the corner anchor to form a track for the sliding of the circumferential constraint.

[0024] Two telescopic connecting rods are connected to both ends of the curved movable plate, respectively;

[0025] Two sliding seats are hinged to the ends of the corresponding telescopic connecting rods and slidably connected to the outer periphery of the axial fixing frame. Adjacent sliding seats are connected by elastic damping elements.

[0026] Furthermore, the axial fixing bracket includes:

[0027] Multiple limiting frames, the same number as the circumferential movable limiting frame, are fitted around the outer periphery of the corroded RC column and are slidably connected to the corresponding sliding seat. The multiple limiting frames are arranged along the axial direction of the corroded RC column.

[0028] The axial connecting rod is detachably connected to the adjacent limiting frame at both ends.

[0029] Furthermore, the limiting frame includes:

[0030] Multiple slide rail connecting plates are arranged along the outer periphery of the corroded RC column, and the outer side is provided with a slide groove for the sliding seat to slide.

[0031] The corner tenon has bosses at both ends that fit the sliding groove, and threaded holes along the axial direction that fit the axial connecting rod.

[0032] Furthermore, the circumferential shell is provided with:

[0033] The mounting groove is adapted to one side of the irregular channel steel and is used to snap the irregular channel steel into the circumferential housing.

[0034] Two limiting ribs are installed on the inner wall of the circumferential housing to provide a track for the sliding of the circumferential constraint.

[0035] Furthermore, a reinforcing connecting plate is provided on the outer side of the adjacent irregular channel steel, and coaxial limiting holes are opened on the adjacent end faces of the two irregular channel steels for the circumferential constraint components to pass through.

[0036] Furthermore, multiple pull-out keys are provided between the shaped channel steel and the circumferential shell.

[0037] On the other hand, the present invention also provides a reinforcement method for RC columns based on circumferential active constraint corrosion. The reinforcement method is implemented using the above-mentioned reinforcement model for RC columns based on circumferential active constraint corrosion, and specifically includes the following steps:

[0038] S1. After pretreating the surface of the corroded RC column, assemble the telescopic frame along the outer periphery of the corroded RC column.

[0039] S2. Multiple circumferential shells are respectively fitted onto the outer periphery of the telescopic frame, so that the outer periphery of the telescopic frame is connected to the inner wall of the circumferential shell; then the ends of two adjacent circumferential shells are connected by special-shaped channel steel to form a circumferential enclosure structure surrounding the corrosion-resistant RC column.

[0040] S3. Slidably connect the circumferential constraint member to the telescopic frame, while making the circumferential constraint member pass through the special-shaped channel steel between adjacent circumferential shells; tension and tighten the circumferential constraint member, apply circumferential active constraint force to the circumferential shell and the telescopic frame, and realize the circumferential tightening of the telescopic frame and the corrosion RC column.

[0041] S4. Inject grout into the gap between the circumferential shell and the corroded RC column, so that the grout fills the space between the circumferential shell, the telescopic frame, and the corroded RC column; after the grout has cured, the reinforcement of the corroded RC column is completed.

[0042] The beneficial effects of this invention are:

[0043] 1. In the circumferential constraint component of this invention, the cable is made of high-strength steel strand. After pretension is applied by a hydraulic tensioning device, its tension is transmitted to the circumferential shell along the track between the arc-shaped movable plate and the corner anchor, causing the circumferential shell to have a circumferential tightening tendency. At the same time, the cable tension is transmitted to the sliding seat through the telescopic connecting rod, pushing the sliding seat to press the limiting frame of the axial fixed frame along the slide groove, causing the limiting frame to generate a circumferential clamping force tightly against the column. The threaded connection between the hollow bolt and the limiting hole of the special-shaped channel steel, and the abutment locking structure between the one-way anchor head and the end face of the hollow bolt, can stably lock the cable pretension and avoid tension loss. This mechanical structure establishes active circumferential constraint before the corrosion RC column undergoes significant deformation through the tension-transmission-locking force path, directly overcoming the hysteresis defect of traditional passive constraint that requires the column to deform before the constraint force is generated, and suppressing the lateral bulging of the corrosion RC column in advance.

[0044] 2. In this invention, the two ends of the short shaft of the elastic damping component are inserted into the holes of the adjacent V-shaped movable frame sliding seat. The two ends of the spring sleeved on the outer periphery of the short shaft abut against the sliding seat and the baffle, respectively. When the corroded RC column is subjected to lateral deformation under horizontal load, the sliding seat slides along the groove, driving the short shaft to compress or stretch the spring. The sliding seat on the deformed side of the corroded RC column pushes the short shaft to compress the spring, and the sliding seat on the opposite side pulls the short shaft to stretch the spring. The spring generates a reverse elastic force through elastic deformation. This mechanical structure converts the kinetic energy generated by the horizontal load into the elastic potential energy of the spring through the compression-stretch deformation of the spring, directly dissipating part of the energy and reducing the plastic damage of the column. At the same time, the reverse elastic force of the spring can help push the sliding seat to reset, reduce the residual deformation of the column, and significantly improve the column's resistance to collapse.

[0045] 3. In this invention, between the shaped channel steel and the circumferential shell, one end of the pull-out key is embedded in the inner wall of the mounting groove of the circumferential shell, and the other end is connected to the flange of the shaped channel steel to form a mechanical interlocking structure. This structure can prevent the two from sliding relative to each other along the axial direction through the interlocking force. The reinforcing connecting plate on the outer side of the adjacent shaped channel steel is connected to the threaded hole of the shaped channel steel through fastening bolts. When the bolts are tightened, shear force is generated, which enhances the shear stiffness of the splice of the shaped channel steel and avoids cracking of the splice. This mechanical connection structure improves the connection stability between the circumferential shell and the shaped channel steel through the synergy of the interlocking force and the bolt shear force, ensuring that the reinforcement system does not separate under axial load and ensuring the overall stress stiffness.

[0046] 4. In the axial fixing frame of the present invention, the limiting frame forms a ring-shaped rigid structure through the insertion of the slide rail connecting plate and the corner tenon, which can uniformly transmit the axial pressure of the column to each slide rail connecting plate; the two ends of the axial connecting rod are threadedly connected to the corner tenons of the adjacent limiting frame, which can transmit the axial force along the column height direction to multiple limiting frames, avoiding local stress concentration; at the same time, the circumferential constraint force is uniformly transmitted to each arc-shaped movable plate and telescopic connecting rod through the cable, and then dispersed to the limiting frame through the sliding seat, so that the circumferential force is evenly distributed along the column circumference; this rigid transmission mechanical structure can achieve uniform diffusion of axial force and circumferential force, avoid local stress concentration caused by uneven force transmission, and prevent the column or reinforcement components from being damaged due to local overload.

[0047] 5. In the telescopic frame of the present invention, the V-shaped movable frame is rotatably connected to the corner anchor through the arc-shaped movable plate, and in conjunction with the hollow sleeve telescopic structure of the telescopic connecting rod, the angle and length can be flexibly adjusted according to the cross-sectional shape of the corroded RC column; the slider at the bottom of the sliding seat forms a sliding fit with the T-shaped groove of the axial fixed frame slide rail connecting plate, which can be translated along the groove to adapt to the local concavity of the column; at the same time, the corner tenon of the limiting frame can be adjusted to adapt to different cross-sectional dimensions by means of the insertion structure of the boss and the slide rail connecting plate groove; when the above adjustable mechanical structures work together, the relative displacement and length adjustment between the components can generate the fitting pressure along the column surface, and the reinforcement system can be tightly fitted to the irregular cross-section without the need for additional repair of the damaged parts of the column, directly solving the problem that traditional reinforcement structures cannot adapt to the irregular cross-section of corroded RC columns. Attached Figure Description

[0048] Figure 1 This is a schematic diagram of the UHPC reinforcement layer structure installed in this invention;

[0049] Figure 2 This is a schematic diagram of the internal structure of the UHPC reinforcement layer installed in this invention;

[0050] Figure 3 For the present invention Figure 2 Partial view at point M in the middle;

[0051] Figure 4 This is a schematic diagram of the reinforced model structure of the present invention;

[0052] Figure 5 For the present invention Figure 4 Partial view at point N in the middle;

[0053] Figure 6 For the present invention Figure 4 Partial view of point P in the middle;

[0054] Figure 7 For the present invention Figure 4 Partial view of point Q;

[0055] Figure 8 This is a top view of the reinforced model of the present invention;

[0056] Figure 9 This is a schematic diagram of the circumferential shell-irregular channel steel structure of the present invention;

[0057] Figure 10 For the present invention Figure 9 Partial view at point X in the middle;

[0058] Figure 11 This is a diagram showing the installation and adaptation of the circumferential shell and the irregular channel steel of the present invention;

[0059] Figure 12 This is a schematic diagram of the circumferential movable limiting frame-axial fixed frame structure of the present invention;

[0060] Figure 13 This is an exploded view of the circumferential movable limiting frame of the present invention;

[0061] Figure 14 This is a schematic diagram of the V-shaped movable frame-corner anchor structure of the present invention;

[0062] Figure 15 This is a schematic diagram of the internal structure of the elastic damping component of the present invention;

[0063] Figure 16 This is an exploded view of the axial fixing frame of the present invention;

[0064] Figure 17 For the present invention Figure 16 Partial view at point Y in the middle;

[0065] Figure 18 This is an exploded view of the limiting frame of the present invention;

[0066] Figure 19 This is a schematic diagram of the circumferential constraint structure of the present invention;

[0067] Figure 20 For the present invention Figure 19 Partial view of point Z in the middle.

[0068] in:

[0069] 100. Corrosion-resistant RC column; 200. UHPC reinforcement layer;

[0070] 1. Circumferential housing; 101. Mounting groove; 102. Limiting rib;

[0071] 2. Irregular channel steel; 201. Limiting hole;

[0072] 3. Telescopic frame; 301. Circumferential movable limit frame; 3010. Corner anchor; 3011. V-shaped movable frame; 3011-a. Arc-shaped movable plate; 3011-b. Telescopic connecting rod; 3011-c. Sliding seat; 3012. Elastic damping component; 3012-a. Short shaft; 3012-b. Spring; 3012-c. Baffle; 302. Axial fixing frame; 3020. Limiting frame; 3020-a. Slide rail connecting plate; 3020-b. Slide groove; 3020-c. Corner tenon; 3021. Axial connecting rod;

[0073] 4. Circumferential restraints; 401. Cables; 402. Hollow bolts; 403. Fastening nuts; 404. One-way anchor heads;

[0074] 5. Reinforced connecting plate; 501. Fastening bolts;

[0075] 6. Pull-out bond. Detailed Implementation

[0076] To enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0077] See attached document Figures 1-20 The reinforcement model of the corrosion-resistant RC column based on circumferential active constraint shown mainly consists of multiple circumferential shells 1, shaped channel steel 2, telescopic frame 3, circumferential constraint members 4, reinforcing connecting plates 5, and pull-out keys 6. Multiple circumferential shells 1 are spaced along the outer periphery of the corrosion-resistant RC column 100, and the end faces of adjacent circumferential shells 1 are spliced ​​together by shaped channel steel 2. The telescopic frame 3 is located between the corrosion-resistant RC column 100 and the circumferential shells 1, with its inner wall abutting against the outer wall of the corrosion-resistant RC column 100 and its outer periphery connected to the inner wall of the circumferential shells 1, forming a three-layer nested structure of "column-frame-shell". The circumferential constraint members 4 penetrate multiple shaped channel steel 2 circumferentially along the circumferential shells 1 and slide with the telescopic frame 3. The structure is tensioned and tightened to provide circumferential active constraint force for the circumferential shell 1 and the telescopic frame 3; the reinforcing connecting plate 5 is attached to the outside of the two special-shaped channel steels 2 used to connect the two adjacent circumferential shells 1, and the outer surface is flush with the circumferential shell 1. The connection is made by bolts to enhance the splicing rigidity of the special-shaped channel steel 2 and the circumferential shell 1; the pull-out key 6 is set between the contact surface of the special-shaped channel steel 2 and the circumferential shell 1 to prevent the two from sliding relative to each other in the axial direction, and multiple pull-out keys 6 are spaced apart along the length direction of the special-shaped channel steel 2.

[0078] It should be noted that, in this invention, the axial direction refers to the direction parallel to the central axis of the corroded RC column 100 itself, that is, the longitudinal direction extending along the height of the corroded RC column 100; the radial direction refers to the direction perpendicular to the axial direction with the central axis of the corroded RC column 100 as the center, specifically the unilateral extension direction from the center of the corroded RC column 100 to the outer periphery of the reinforced model, which is the direction in which the circumferential constraint force generated by the circumferential constraint member 4 is applied; the circumferential direction refers to the outer periphery of the annular structure formed by multiple circumferential shells 1, which is the arrangement direction of the circumferential constraint member 4 and the force transmission direction of the active constraint system.

[0079] See appendix Figures 9-11 As shown, the circumferential shell 1 is prefabricated using UHPC material. Each circumferential shell 1 is an L-shaped structure, and an axial mounting groove 101 is provided on the end face of two adjacent circumferential shells 1. The cross-sectional shape of the mounting groove 101 is adapted to one side flange of the special-shaped channel steel 2. The flange of the special-shaped channel steel 2 can be snapped into the mounting groove 101 to achieve the initial positioning of the circumferential shell 1 and the special-shaped channel steel 2. Two parallel limiting ribs 102 are integrally formed on the inner wall of each side of the circumferential shell 1. The two limiting ribs 102 are distributed along the axial direction, and a groove is formed between the two limiting ribs 102. This groove serves as the sliding track of the circumferential constraint member 4, restricting the circumferential displacement of the circumferential constraint member 4 and preventing the circumferential constraint member 4 from shifting when the RC column 100 is deformed due to tension or corrosion. This ensures that the tension of the circumferential constraint member 4 is uniformly transmitted to the circumferential shell 1 and the telescopic frame 3 along the circumferential direction. The irregular channel steels 2 at the ends of two adjacent circumferential shells 1 are connected to each other. The irregular channel steel 2 has a concave structure. Multiple limiting holes 201 are provided on the end face of the connecting end. Two corresponding limiting holes 201 are coaxially arranged to allow the circumferential constraint member 4 to pass through. The contact surfaces of the irregular channel steel 2 and the circumferential shell 1 are connected by multiple pull-out keys 6. The multiple pull-out keys 6 are spaced apart along the axial direction of the irregular channel steel 2. One end of the pull-out key 6 is embedded in the inner wall of the circumferential shell 1, and the other end is fixedly connected to the flange of the irregular channel steel 2. The mechanical interlocking force prevents the circumferential shell 1 and the irregular channel steel 2 from sliding relative to each other along the axial direction. The reinforcing connecting plate 5 is prefabricated from stainless steel plate, and bolt holes adapted to the extended web of the special-shaped channel steel 2 are opened on it. Corresponding bolt holes are also opened on the special-shaped channel steel 2. The fastening bolt 501 passes through the bolt holes of the reinforcing connecting plate 5 and the bolt holes of the special-shaped channel steel 2, and pre-fastens two adjacent special-shaped channel steels 2 to form a continuous circumferential enclosure structure of multiple circumferential shells 1, while enhancing the shear stiffness at the splice.

[0080] See appendix Figure 3 and attached Figures 12-18 As shown, the telescopic frame 3 includes multiple circumferential movable limiting frames 301 and axial fixing frames 302. The multiple circumferential movable limiting frames 301 are connected together through the axial fixing frames 302, and the two work together to transfer the constraint force on the corroded RC column 100. For details, please refer to the appendix. Figures 16-18As shown, the axial fixing frame 302 consists of multiple limiting frames 3020 and axial connecting rods 3021. The multiple limiting frames 3020 are arranged at intervals along the axial direction of the corroded RC column 100, and each limiting frame 3020 is circumferentially fitted around the outer periphery of the corroded RC column 100. The inner wall of the limiting frame 3020 abuts against the outer wall of the corroded RC column 100. In this embodiment, the limiting frame 3020 is composed of four slide rail connecting plates 3020-a and four corner tenons 3020-c spliced ​​together. The slide rail connecting plates 3020-a are evenly distributed along the outer periphery of the corroded RC column 100, and their outer sides are provided with sliding grooves 3020-b. -b has a T-shaped cross section; the corner tenon 3020-c has bosses at both ends that are adapted to the slide groove 3020-b, and the bosses can slide into the slide groove 3020-b to realize the detachable connection between the slide rail connecting plate 3020-a and the corner tenon 3020-c; the corner tenon 3020-c has a threaded hole in the axial direction, and the two ends of the axial connecting rod 3021 are respectively threaded to the corner tenons 3020-c of two adjacent limit frames 3020, so that multiple limit frames 3020 are connected in series to form an axially stable structure. At the same time, the axial connecting rod 3021 can be adapted to limit frames 3020 with different axial spacing by adjusting the thread insertion depth.

[0081] It should be noted that during the actual installation of the axial fixing bracket 302, the top end of the axial connecting rod 3021 needs to be screwed into the corresponding upper corner tenon 3020-c, and after screwing in, the top end should protrude from the upper end face of the corner tenon 3020-c to leave room for connection and subsequent adjustment. For the corner tenon 3020-c corresponding to the bottom end of the axial connecting rod 3021, the bottom end should be initially screwed into the corner tenon 3020-c during installation (no need to tighten it completely). After all the limiting frames 3020 of the entire axial fixing bracket 302 and the axial connecting rod 3021 are initially assembled, the thread insertion depth at both ends of the axial connecting rod 3021 can be adjusted by rotating it, thereby precisely adjusting the axial distance between two adjacent limiting frames 3020 to ensure that multiple limiting frames 3020 are evenly distributed along the axial direction of the corroded RC column 100, improving the overall stability of the axial fixing bracket 302. The threaded holes on two adjacent corner tenons 3020-c have opposite thread directions.

[0082] See appendix for further details. Figures 13-15As shown, the number of circumferential movable limiting frames 301 is the same as the number of limiting frames 3020. The circumferential movable limiting frames 301 are connected to the inner wall of the circumferential housing 1 and are slidably engaged with the axial fixed frame 302. Specifically, the circumferential movable limiting frame 301 includes multiple corner anchors 3010, multiple V-shaped movable frames 3011, and elastic damping elements 3012. The corner anchors 3010 are welded from steel plates, and their shape is adapted to the corner of the inner wall of the circumferential housing 1. The outer two sides of the corner anchors 3010 are attached to the inner wall of the circumferential housing 1 and fastened with bolts. Each corner anchor 3010 is connected to one V-shaped movable frame 3011, and the ends of two adjacent V-shaped movable frames 3011 that are close to each other are connected by elastic damping elements 3012. The V-shaped movable frame 3011 includes an arc-shaped movable plate 3011-a, a telescopic connecting rod 3011-b, and a sliding seat 3011-c. The arc-shaped movable plate 3011-a is sleeved on the inner side of the corner anchor 3010 and is rotatably connected to the corner anchor 3010 by bolts, so that the arc-shaped movable plate 3011-a can rotate around the axis of the corner anchor 3010. At the same time, a gap is formed between the arc-shaped movable plate 3011-a and the corner anchor 3010, which serves as the sliding track of the circumferential constraint member 4. The telescopic connecting rod 3011-b is a hollow sleeve structure. One end of it is fixed to the end of the arc-shaped movable plate 3011-a by bolts, and the other end is hinged to the sliding seat 3011-c. The bottom of the sliding seat 3011-c is provided with a slider that matches the slide groove 3020-b of the slide rail connecting plate 3020-a. The slider can slide along the slide groove 3020-b to realize the sliding connection between the V-shaped movable frame 3011 and the axial fixed frame 302. The end face of the sliding seat 3011-c is provided with a preset insertion hole (not shown in the figure) for connecting the elastic damping element 3012.

[0083] Specifically, the elastic damping component 3012 is an integrated energy-dissipating structure, consisting of a short shaft 3012-a, a spring 3012-b, a baffle 3012-c, and a hollow column. The spring 3012-b is the core energy-dissipating element, with its two ends fixedly connected to the center surface of a circular baffle 3012-c, forming a symmetrical intermediate component. Both baffles 3012-c have a short shaft 3012-a fixed coaxially at their outer center (the side opposite to the spring 3012-b). The central axis of the short shaft 3012-a coincides with the central axis of the spring 3012-b. Meanwhile, a hollow column with open ends is fitted around the outer periphery of the baffles 3012-c and the spring 3012-b. The two ends of the hollow column are slidably connected to the outer peripheral walls of the two short shafts 3012-a, forming a protective shell for the inner spring 3012-b and the baffles 3012-c, preventing the grout from directly wrapping the spring 3012-b and affecting its elastic deformation.

[0084] It should be noted that in actual use, the parameters of spring 3012-b must be matched with the expected lateral force, lateral displacement, and adaptability depth of the highly corrosive environment of the corroded RC column 100 for seismic fortification. This ensures that spring 3012-b can efficiently dissipate horizontal load energy while guaranteeing long-term service reliability. First, through structural mechanics analysis, the expected lateral force (denoted as Fh) and target lateral displacement (denoted as z) of the corroded RC column 100 to be reinforced are determined. These parameters need to be calculated comprehensively in conjunction with the seismic fortification level of the structure where the corroded RC column 100 is located, the cross-sectional dimensions of the corroded RC column 100, and the degree of corrosion degradation. Second, based on the number of elastic damping elements 3012, the force (denoted as Fs) that a single spring 3012-b needs to bear is calculated according to the principle of uniform load distribution, ensuring that multiple springs 3012-b work together to dissipate energy. Finally, the stiffness coefficient (denoted as k) of spring 3012-b is calculated using the formula k=Fs / z. It is necessary to ensure that the deformation of spring 3012-b under Fs load matches the target lateral displacement z, while possessing sufficient restoring force to ensure that the sliding seat 3011-c is reset after the load is unloaded. To cope with extreme load conditions (such as strong earthquakes), a safety factor of no less than 1.5 times is reserved based on the calculated value Fs, i.e., the maximum working load Fmax ≥ 1.5 × Fs, to prevent spring 3012-b from entering the plastic yielding stage. The maximum working deformation Δmax of spring 3012-b must be greater than the elastic deformation requirement corresponding to the target lateral displacement z, typically taken as Δmax ≥ 1.2 × z, to ensure that spring 3012-b remains within the effective elastic range during structural deformation, reserving sufficient safety redundancy. In this embodiment, considering the durability and mechanical performance requirements in highly corrosive environments, high-strength, fatigue-resistant 60Si2MnA spring steel is selected for spring 3012-b.

[0085] During assembly, the short shafts 3012-a at both ends of the elastic damping element 3012 are inserted into the pre-set insertion holes of the sliding seats 3011-c of the two adjacent V-shaped movable frames 3011. The short shafts 3012-a and the insertion holes are clearance-fitted to ensure that the elastic damping element 3012 can move synchronously when the sliding seats 3011-c slide. When the corroded RC column 100 is subjected to a horizontal load (radial) and undergoes lateral deformation, the sliding seat 3011-c on the deformed side slides along the groove 3020-b of the slide rail connecting plate 3020-a towards the center of the corroded RC column 100, pushing the corresponding short shafts 3012-a. 2-a compresses the baffle 3012-c and the spring 3012-b, while the sliding seat 3011-c on the opposite side slides along the groove 3020-b in a direction away from the center of the corroded RC column 100, pulling the short shaft 3012-a and the baffle 3012-c at the corresponding end, thereby stretching the spring 3012-b; the spring 3012-b absorbs the kinetic energy generated by the horizontal load through elastic deformation and converts it into its own elastic potential energy. After the load is unloaded, it pushes the sliding seat 3011-c back to the initial position through elastic reset, thereby effectively dissipating energy and reducing the residual plastic damage of the corroded RC column 100.

[0086] See appendix Figure 19 and 20 As shown, the circumferential constraint component 4 is a circumferential active pre-tightening system, consisting of a cable 401, hollow bolts 402, fastening nuts 403, and a one-way anchor head 404. These components work together to apply and lock the circumferential constraint force. Specifically, two shaped channel steels 2 at the joint of two adjacent circumferential shells 1 are defined as a set of constraint units (i.e., each set of constraint units contains two parallel shaped channel steels 2). The number of hollow bolts 402 is the same as the number of constraint unit sets. Each hollow bolt 402 passes through a pre-set coaxial limiting hole 201 on the corresponding set of shaped channel steels 2 circumferentially, and the hollow bolt 402 is threaded to the inner wall of the limiting hole 201. Except for one hollow bolt 402 that serves as the tensioning end, both ends of the remaining hollow bolts 402 are fitted with fastening nuts 403. By tightening the fastening nuts 403 to abut against the end face of the shaped channel steel 2, the position of the hollow bolt 402 is locked, preventing displacement during cable tensioning. The hollow bolt 402, which serves as the tensioning end, is not fitted with a fastening nut 403. Space is reserved at both ends for the cable 401 to pass through and lock. One-way anchor heads 404 are provided at both ends of the hollow bolt 402. The one-way anchor heads 404 are locked to the ends of the cable 401 through a conical extrusion structure, thereby achieving mechanical locking of the tension of the cable 401.

[0087] In this embodiment, the cable 401 is made of 1×7 high-strength steel strand, which is laid along the circumferential path of the inner wall of the circumferential shell 1. The specific laying trajectory is as follows: it enters from one end of the hollow bolt 402 at the tensioning end, passes through the track between the corner anchor 3010 and the arc-shaped movable plate 3011-a (this track provides guidance for the cable 401 and avoids direct friction with the telescopic frame 3), and the inner holes of the hollow bolts 402 of the remaining constraint units. The cable 401 is always engaged in the groove formed by the two parallel limiting ribs 102 on the inner wall of the circumferential shell 1 (the limiting ribs 102 restrict the radial displacement of the cable 401 and ensure that the tension is uniformly transmitted along the circumferential direction). After circumferentially turning around the corroded RC column 100, the two ends of the cable 401 cross and pass back to the other end of the hollow bolt 402 at the tensioning end, forming a closed circumferential path. During tensioning and locking, a preset pretension is applied to both ends of the cable 401 using a hydraulic tensioning device. The tension of the cable 401 is transmitted along the path of cable 401 → arc-shaped movable plate 3011-a → telescopic connecting rod 3011-b → sliding seat 3011-c → limiting frame 3020, forcing the limiting frame 3020 to fit tightly against the outer wall of the corroded RC column 100. After the tension stabilizes, the one-way anchor head 404 is tightened to make it fit tightly against the end face of the hollow bolt 402 at the tensioning end. The self-locking structure of the one-way anchor head 404 locks the tension of the cable 401, thereby applying a continuous circumferential active constraint force to the circumferential shell 1 and the telescopic frame 3 through the cable 401, suppressing the lateral deformation of the corroded RC column 100.

[0088] The reinforcement model for corroded RC columns based on circumferential active constraint disclosed in this invention achieves enhanced load-bearing capacity, deformation control, and long-term durability assurance for corroded RC columns 100 through a synergistic mechanism of "pre-tightening to establish active constraint - graded load transfer - deformation-coordinated energy dissipation - dual anti-corrosion barrier". The specific working principle is as follows:

[0089] After the reinforcement is completed, the cable 401 of the circumferential constraint member 4 forms an initial circumferential active constraint force through pretensioning, laying the force foundation for the entire reinforcement system. By tensioning the cable 401 with hydraulic equipment, the cable 401 generates circumferential tension, which is transmitted along a preset path: cable 401 → track between the arc-shaped movable plate 3011-a and the corner anchor 3010 → corner anchor 3010 → inner wall of the circumferential shell 1, causing the circumferential shell 1 to form a circumferential tightening trend; at the same time, the tension of the cable 401 is transmitted to the telescopic connecting rod 3011-b through the arc-shaped movable plate 3011-a, and then to the slide rail connecting plate 3020-a of the axial fixing frame 302 through the sliding seat 3011-c, ultimately forcing the limiting frame 3020 to tightly adhere to the outer wall of the corroded RC column 100, forming an initial circumferential clamping force on the corroded RC column 100, suppressing the possible lateral bulging deformation of the corroded RC column 100 in advance, and avoiding the lag of the traditional passive constraint "deformation before constraint". After the cable 401 is tensioned to the design preload, the one-way anchor head 404 fitted at the end of the cable 401 is tightened, so that the one-way anchor head 404 and the end face of the hollow bolt 402 are tightly abutted, locking the tension of the cable 401; at the same time, the hollow bolt 402 is threadedly connected to the limiting hole 201 of the special-shaped channel steel 2, and the fastening nut 403 is fitted and tightened on the outer circumference of the hollow bolt 402 to bear the radial component of the cable 401, prevent the hollow bolt 402 from loosening, and ensure the long-term stability of the initial active constraint force.

[0090] It should be noted that the cable 401 is engaged between two limiting ribs 102 on the inner wall of the circumferential housing 1. The limiting ribs 102 ensure that the tension of the cable 401 is uniformly transmitted to the corner anchor 3010 along the circumferential direction by restricting the displacement of the cable 401, thus preventing the cable 401 from shifting and causing local constraint failure. At the same time, the hollow bolt 402 is positioned by the thread of the limiting hole 201, converting the radial component of the cable 401 into pressure on the special-shaped channel steel 2. With the locking of the fastening nut 403, the long-term stability of the preload is achieved.

[0091] When the corroded RC column 100 is subjected to vertical axial pressure (such as structural self-weight or floor load), the reinforced model and the column body of the corroded RC column 100 work together to avoid local stress concentration. The axial pressure borne by the corroded RC column 100 is first transmitted to the limiting frame 3020 of the axial fixing frame 302. The limiting frame 3020 transmits the axial force to the adjacent limiting frame 3020 through the axial connecting rod 3021, achieving a uniform distribution of the axial force in the axial direction. At the same time, the limiting frame 3020 transmits part of the axial force to the sliding seat 3011-c, and then through the telescopic connecting rod 3011-b and the arc-shaped movable plate 3011-a to the circumferential shell 1, so that the circumferential shell 1 and the column body of the corroded RC column 100 work together to bear the axial load, improving the overall vertical bearing capacity. When the corroded RC column 100 undergoes slight axial compression deformation due to axial pressure, the axial connecting rod 3021 of the axial fixing bracket 302 rigidly transmits the deformation through the threaded connection, ensuring that multiple limit frames 3020 deform synchronously. At the same time, the pull-out key 6 between the shaped channel steel 2 and the circumferential shell 1 is embedded in their contact surface, preventing axial relative sliding between the circumferential shell 1 and the shaped channel steel 2 through mechanical interlocking force, thus avoiding stiffness loss at the splice due to axial slippage. The fastening bolts 501 of the reinforcing connecting plate 5 withstand shear force, further enhancing the splice stiffness between the shaped channel steel 2 and the circumferential shell 1, ensuring that the entire reinforcement system maintains its integrity under axial load and does not experience splice cracking or separation.

[0092] It should be noted that one end of the pull-out key 6 is embedded in the inner wall of the circumferential housing 1, and the other end is fixed to the flange of the shaped channel steel 2. When the RC column 100 is axially deformed due to corrosion, the pull-out key 6 prevents the circumferential housing 1 and the shaped channel steel 2 from sliding relative to each other axially through mechanical interlocking force. At the same time, the fastening bolt 501 passes through the threaded holes of the reinforcing connecting plate 5 and the shaped channel steel 2, converting the axial force of the adjacent shaped channel steel 2 into bolt shear force, ensuring that the stiffness of the splice is not lost.

[0093] When the corroded RC column 100 undergoes lateral deformation under horizontal loads (such as earthquakes and wind loads), the reinforcement model controls plastic damage to the column and enhances its resistance to collapse through the dual action of "active constraint to suppress deformation + elastic damping to dissipate energy". When the corroded RC column 100 shifts to one side under horizontal loads, it first compresses the slide rail connecting plate 3020-a of the axial fixing frame 302 on the same side. The slide rail connecting plate 3020-a pushes the sliding seat 3011-c to slide along the slide groove 3020-b in the direction of deformation of the corroded RC column 100 through the slide groove 3020-b. The sliding of the sliding seat 3011-c causes the telescopic connecting rod 3011-b to extend and retract (the telescopic connecting rod 3011-b on the deformed side is compressed, and the opposite side is stretched). At the same time, the arc-shaped movable plate 3011-a rotates around the bolt of the corner anchor 3010, so that the V-shaped movable frame 3011 as a whole adjusts its angle with the deformation of the column. At this time, when the arc-shaped movable plate 3011-a rotates, the track between it and the corner anchor 3010 causes the cable 401 to deform synchronously—the cable 401 on the deformed side is further stretched, the tension increases, and a reverse constraint force is generated along the circumferential direction; this reverse constraint force is transmitted along the path of "cable 401 → arc-shaped movable plate 3011-a → telescopic connecting rod 3011-b → sliding seat 3011-c → sliding rail connecting plate 3020-a → corroded RC column 100", and directly acts on the deformed part of the corroded RC column 100, inhibiting the lateral bulging and displacement of the corroded RC column 100, and avoiding brittle failure such as longitudinal reinforcement buckling and concrete crushing of the corroded RC column 100 due to excessive deformation. Furthermore, during the sliding process of the sliding seat 3011-c along the slide groove 3020-b, the elastic damping element 3012 between adjacent sliding seats 3011-c is squeezed (deformed side) or stretched (opposite side). The spring 3012-b of the elastic damping element 3012 undergoes elastic deformation, and the force is transmitted through the baffle 3012-c and the short shaft 3012-a, converting the kinetic energy generated by the horizontal load into the elastic potential energy of the spring 3012-b. When the horizontal load is unloaded, the spring 3012-b releases the elastic potential energy, pushing the sliding seat 3011-c to reset, reducing the residual plastic deformation of the corroded RC column 100, and improving the ductility and seismic energy dissipation capacity of the corroded RC column 100.

[0094] It should be noted that the short shaft 3012-a of the elastic damping element 3012 is inserted into the insertion hole of the sliding seat 3011-c of the adjacent V-shaped movable frame 3011. When the sliding seat 3011-c slides along the slide groove 3020-b of the slide rail connecting plate 3020-a, the short shaft 3012-a drives the baffle 3012-c to compress / stretch the spring 3012-b. The elastic deformation of the spring 3012-b is transmitted through the path of short shaft 3012-a → baffle 3012-c → sliding seat 3011-c, converting horizontal kinetic energy into elastic potential energy.

[0095] In highly corrosive environments such as saline soil and coastal areas, the reinforcement system utilizes a dual anti-corrosion structure of "outer UHPC shell + inner grouting material" to block the intrusion of corrosive media and ensure the long-term performance of both the original column and the reinforcement system. Firstly, the circumferential shell 1 is prefabricated using UHPC material, which has high internal density and extremely low porosity, effectively blocking the penetration paths of corrosive media such as chloride ions, moisture, and oxygen, preventing external corrosive media from directly contacting and corroding the surface of the RC column 100. Simultaneously, the inner wall of the circumferential shell 1 is equipped with limiting ribs 102 that fit tightly against the cable 401, preventing the cable 401 from corroding due to exposure to the corrosive environment and ensuring the long-term effectiveness of the active restraint system. Secondly, during the reinforcement process, ultra-high strength non-shrink grout is injected from the bottom of the circumferential shell 1 and the corroded RC column 100. Under the action of gravity, the grout fills all the tiny gaps between the circumferential shell 1, the telescopic frame 3, and the corroded RC column 100 (such as the contact surface between the slide rail connecting plate 3020-a and the column, and the fitting gap between the sliding seat 3011-c and the groove 3020-b), forming a dense grout layer. After the grout layer is cured and maintained, it forms the UHPC reinforcement layer 200. This UHPC reinforcement layer 200 enhances the interfacial bonding between the components (such as the mechanical interlocking force between the slide rail connecting plate 3020-a and the corroded RC column 100) on the one hand, and forms an inner anti-corrosion barrier on the other hand, further blocking the corrosive medium that may invade through the splicing gaps, preventing the original corroded RC column 100 from continuing to deteriorate, and protecting the metal components of the telescopic frame 3 (such as the sliding seat 3011-c and the axial connecting rod 3021) from corrosion.

[0096] To address the irregular cross-sections of the corroded RC column 100 caused by rust, such as corner damage and localized depressions, the telescopic frame 3 uses an adjustable structure to achieve a tight fit with the corroded RC column 100, ensuring uniform transmission of constraint force. During installation, the arc-shaped movable plate 3011-a of the V-shaped movable frame 3011 can rotate around the bolts of the corner anchor 3010. The telescopic connecting rod 3011-b can be adjusted in length via a sleeve structure, causing the sliding seat 3011-c to slide along the groove 3020-b of the slide rail connecting plate 3020-a. This ensures that the inner wall of the limiting frame 3020 remains in contact with the irregular surface of the corroded RC column 100, preventing localized loss of constraint force due to surface depressions in the corroded RC column 100. Meanwhile, the corner tenon 3020-c of the limiting frame 3020 is slidably connected to the slide groove 3020-b of the slide rail connecting plate 3020-a through the boss, and the splicing length of the slide rail connecting plate 3020-a can be adjusted according to the cross-sectional dimensions of the corroded RC column 100 to adapt to columns of different cross-sectional sizes; at the same time, the axial connecting rod 3021 is connected to the corner tenon 3020-c through threads, and the axial spacing between adjacent limiting frames 3020 can be adjusted to adapt to the reinforcement requirements of columns of different heights.

[0097] Specific application examples:

[0098] A six-story frame-structure office building in a coastal city suffered severe corrosion in its four ground-floor reinforced concrete (RC) columns due to long-term exposure to chloride ion penetration from the marine atmosphere and alternating wet and dry conditions caused by typhoons. Structural calculations indicated that the four corroded RC columns on the ground floor were insufficient to withstand horizontal seismic loads. Therefore, the reinforcement model based on circumferentially active restraint corrosion of RC columns, as described in this invention, was required for reinforcement and repair to restore and improve their load-bearing capacity, ductility, and long-term durability. The specific installation steps are as follows:

[0099] ① Use a high-pressure water gun to wash away salt stains, loose rust and loose concrete on the surface of the corroded RC column 100. Use an angle grinder to grind the peeling edges to a solid base surface. Use epoxy resin grout to seal the cracks on the surface of the corroded RC column 100. No additional repair is required for local depressions. Mark the position of the axial installation limit frame 3020 of the corroded RC column 100.

[0100] ② Insert the slider of the sliding seat 3011-c into the groove 3020-b of the slide rail connecting plate 3020-a, and slide it along the groove 3020-b to the position that matches the V-shaped movable frame 3011; then insert the grooves 3020-b of the four slide rail connecting plates 3020-a into the bosses of the corner tenons 3020-c to form an annular limiting frame 3020, which is fitted onto the outer periphery of the corroded RC column 100 and adjusted to the marked position to ensure that the inner wall is in contact with the column surface of the corroded RC column 100; thread the two ends of the axial connecting rod 3021 to the corner tenons 3020-c of the adjacent limiting frame 3020, adjust the thread insertion depth, and form a stable axial fixing frame 302;

[0101] ③ Fix the four corner anchors 3010 to the corners of the inner wall of the circumferential housing 1 with bolts, ensuring that the outer periphery of the corner anchors 3010 is tightly fitted to the inner wall of the circumferential housing 1; then fit the arc-shaped movable plate 3011-a inside the corner anchors 3010 and achieve a rotatable connection with bolts; fix one end of the telescopic connecting rod 3011-b to the end of the arc-shaped movable plate 3011-a with bolts, and hinge the other end to the sliding seat 3011-c; finally, insert both ends of the short shaft 3012-a of the elastic damping element 3012 into the insertion holes of the adjacent sliding seat 3011-c, ensuring that the spring 3012-b is in its natural state and the baffle 3012-c is in contact with the end face of the sliding seat 3011-c;

[0102] ④ Insert the flange of the special-shaped channel steel 2 into the mounting groove 101 of the circumferential shell 1, and make the end faces of the special-shaped channel steel 2 of the adjacent circumferential shell 1 meet; attach the reinforcing connecting plate 5 to the outside of the adjacent special-shaped channel steel 2, and pre-tighten it with fastening bolts 501 (M16 fastening bolts are used); then pass the cable 401 through the track between the arc-shaped movable plate 3011-a and the corner anchor 3010, the limiting hole 201 of the special-shaped channel steel 2, and insert it between the two limiting ribs 102 on the inner wall of the circumferential shell 1 to ensure that the cable 401 is evenly distributed along the circumference; use a hydraulic tensioning device to tension the cable 401 synchronously, after tensioning, screw the hollow bolt 402 into the limiting hole 201 of the special-shaped channel steel 2, put on the fastening nut 403, and finally install the one-way anchor head 404 to abut against the end face of the hollow bolt 402 to lock the pretension of the cable 401;

[0103] ⑤ A 30mm diameter grouting hole is opened at the bottom of the circumferential shell 1. Ultra-high strength non-shrink grout is injected from the bottom grouting hole using a pressure grouting machine until the top grout is flush with the end face of the circumferential shell 1. The grouting hole is then sealed. Finally, geotextile is covered and kept moist at room temperature to form the UHPC reinforcement layer 200. Ultimately, the UHPC reinforcement layer 200, the circumferential shell 1, and the corroded RC column 100 are integrated.

[0104] It should be noted that, taking the corroded RC column 100 at the bottom of a six-story frame office building in a coastal city as an example in the application case of this invention, the corroded RC column 100 was determined by structural analysis to have the following characteristics: expected lateral force Fh = 800kN, target lateral displacement z = 30mm, and four sets of elastic damping elements 3012 (i.e., four springs 3012-b working together) arranged circumferentially along the telescopic frame 3. Based on this, the specific parameters of the springs 3012-b are as follows: the force borne by a single spring 3012-b is Fs = Fh / 4 = 200kN; the stiffness coefficient k = Fs / z = 200kN / 30mm ≈ 6.67kN / mm (7kN / mm is taken in engineering applications); the maximum working load Fmax = 1.5 × Fs = 300kN (320kN is taken in engineering design to further enhance the safety reserve); and the maximum working deformation Δmax = 1.2 × z = 36mm (40mm is taken in engineering applications to reserve greater deformation redundancy). The above parameters were verified by hydraulic tension test. Spring 3012-b still maintains elastic deformation when subjected to a load of 320kN, and there is no plastic damage when the maximum deformation is 40mm. After 1000h salt spray corrosion test, the mechanical property decay rate is ≤5%, which is fully suitable for the reinforcement requirements of RC column 100 in highly corrosive environment.

[0105] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A reinforcement model based on a ring vector active restraint corrosion RC column, characterized in that, The utility model relates to a reinforcing method of corrosion RC column based on ring active constraint, and a reinforcing model thereof. The utility model relates to a reinforcing method of corrosion RC column based on ring active constraint, and a reinforcing model thereof. The utility model relates to a reinforcing method of corrosion RC column based on ring active constraint, and a reinforcing model thereof. The utility model relates to a reinforcing method of corrosion RC column based on ring active constraint, and a reinforcing model thereof.

2. The retrofitting model of a ring-based active confinement corrosion (RC) column according to claim 1, wherein, The utility model relates to a reinforcing method of corrosion RC column based on ring active constraint, and a reinforcing model thereof. The utility model relates to a reinforcing method of corrosion RC column based on ring active constraint, and a reinforcing model thereof. The utility model relates to a reinforcing method of corrosion RC column based on ring active constraint, and a reinforcing model thereof.

3. The retrofitting model of a ring-based active confinement corrosion (RC) column according to claim 2, wherein, The utility model relates to a reinforcing method of corrosion RC column based on ring active constraint, and a reinforcing model thereof. The utility model relates to a reinforcing method of corrosion RC column based on ring active constraint, and a reinforcing model thereof. The utility model relates to a reinforcing method of corrosion RC column based on ring active constraint, and a reinforcing model thereof. The utility model relates to a reinforcing method of corrosion RC column based on ring active constraint, and a reinforcing model thereof.

4. The retrofitting model of a ring-based active confinement corrosion (RC) column according to claim 3, wherein, The utility model relates to a reinforcing method of corrosion RC column based on ring active constraint, and a reinforcing model thereof. The utility model relates to a reinforcing method of corrosion RC column based on ring active constraint, and a reinforcing model thereof. The utility model relates to a reinforcing method of corrosion RC column based on ring active constraint, and a reinforcing model thereof. The utility model relates to a reinforcing method of corrosion RC column based on ring active constraint, and a reinforcing model thereof.

5. The retrofitting model of a ring-based active confinement corrosion (RC) column according to claim 4, wherein, The utility model relates to a reinforcing method of corrosion RC column based on ring active constraint, and a reinforcing model thereof. The utility model relates to a reinforcing method of corrosion RC column based on ring active constraint, and a reinforcing model thereof. The utility model relates to a reinforcing method of corrosion RC column based on ring active constraint, and a reinforcing model thereof.

6. The retrofitting model of a ring-based active confinement corrosion (RC) column according to claim 5, wherein, The utility model relates to a reinforcing method of corrosion RC column based on ring active constraint, and a reinforcing model thereof. The utility model relates to a reinforcing method of corrosion RC column based on ring active constraint, and a reinforcing model thereof. The utility model relates to a reinforcing method of corrosion RC column based on ring active constraint, and a reinforcing model thereof.

7. The retrofitting model of a ring-based active confinement corrosion (RC) column according to claim 1, wherein, The utility model relates to a reinforcing method of corrosion RC column based on ring active constraint, and a reinforcing model thereof. The utility model relates to a reinforcing method of corrosion RC column based on ring active constraint, and a reinforcing model thereof. The utility model relates to a reinforcing method of corrosion RC column based on ring active constraint, and a reinforcing model thereof.

8. The retrofitting model of a ring-based active confinement corrosion (RC) column according to claim 7, wherein, The utility model relates to a reinforcing method of corrosion RC column based on ring active constraint, and a reinforcing model thereof.

9. The retrofitting model of a ring-based active confinement corrosion (RC) column according to claim 8, wherein, The utility model relates to a reinforcing method of corrosion RC column based on ring active constraint, and a reinforcing model thereof.

10. A reinforcement method for a ring-shaped active restraint corrosion RC column, characterized by, The utility model relates to a reinforcing method of corrosion RC column based on ring active constraint, and a reinforcing model thereof. The utility model relates to a reinforcing method of corrosion RC column based on ring active constraint, and a reinforcing model thereof. The utility model relates to a reinforcing method of corrosion RC column based on ring active constraint, and a reinforcing model thereof. The utility model relates to a reinforcing method of corrosion RC column based on ring active constraint, and a reinforcing model thereof. The utility model relates to a reinforcing method of corrosion RC column based on ring active constraint, and a reinforcing model thereof. The utility model relates to a reinforcing method of corrosion RC column based on ring active constraint, and a reinforcing model thereof. 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The utility model relates to a reinforcing method of corrosion RC column based on ring active constraint, and a reinforcing model thereof. The utility model relates to a reinforcing method of corrosion RC column based on ring active constraint, and a reinforcing model thereof. The utility model relates to a reinforcing method of corrosion RC column based on ring active constraint, and a reinforcing model thereof. The utility model relates to a reinforcing method of corrosion RC column based on ring active constraint, and a reinforcing model thereof. The utility model relates to a reinforcing method of corrosion RC column based on ring active constraint, and a reinforcing model thereof. The utility model relates to a reinforcing method of corrosion RC column based on ring active constraint, and a reinforcing model thereof. The utility model relates to a reinforcing method of corrosion RC column based on ring active constraint, and a reinforcing model thereof. The utility model relates to a reinforcing method of corrosion RC column based on ring active constraint, and a reinforcing model thereof. The utility model relates to a reinforcing method of corrosion RC column based on ring active constraint, and a reinforcing model thereof. The utility model relates to a reinforcing method of corrosion RC column based on ring active constraint, and a reinforcing model thereof. The utility model relates to a reinforcing method of corrosion RC column based on ring active constraint, and a reinforcing model thereof. The utility model relates to a reinforcing method of corrosion RC column based on ring active constraint, and a reinforcing model thereof. The utility model relates to a reinforcing method of corrosion RC column based on ring active constraint, and a reinforcing model thereof. The utility model relates to a reinforcing method of corrosion RC column based on ring active constraint, and a reinforcing model thereof. The utility model relates to a reinforcing method of corrosion RC column based on ring active constraint, and a reinforcing model thereof. The utility model relates to a reinforcing method of corrosion RC column based on ring active constraint, and a reinforcing model thereof. The utility model relates to a reinforcing method of corrosion RC column based on ring active constraint, and a reinforcing model thereof. The utility model relates to a reinforcing method of corrosion RC column based on ring active constraint, and a reinforcing model thereof. The utility model relates to a reinforcing method S3, slidingly connect the hoop constraint with the telescopic skeleton, and make the hoop constraint penetrate the special-shaped channel steel between the adjacent hoop shells; tension and fasten the hoop constraint, apply a hoop active constraint force to the hoop shell and the telescopic skeleton, and realize the hoop tightening of the telescopic skeleton and the corroded RC column; S4, inject grouting material from the gap between the hoop shell and the corroded RC column, so that the grouting material fills the space between the hoop shell, the telescopic skeleton and the corroded RC column; after the grouting material is cured, the reinforcement of the corroded RC column is completed.

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