Reinforcement device and reinforcement method for reinforced concrete column

Abstract

This invention belongs to the field of civil engineering technology, specifically relating to a reinforcement device and method for reinforced concrete columns. The device includes an outer positioning component fixed to an annular groove in the column body, an anchoring component installed at the column base, and multiple circumferentially distributed energy-dissipating support components. The energy-dissipating support adopts a unique nested structure of inner and outer tubes. The two ends of the inner tube are pressed together with end plates via elastic pads and are inclinedly hinged between the positioning component and the foundation cap. The prestressing application component includes pulleys and cables. One end of the cable is anchored to the column base, and the other end is connected to the upper end of the energy-dissipating support after being turned by the pulley. A concrete reinforcement layer with a pre-reserved gap between the concrete and the column wall is poured on the outside of the column body, forming a complete protective system. This invention fundamentally solves the problems of slow start-up, easy failure, and difficult post-earthquake repair of traditional single energy-dissipating devices. With its modular and replaceable design, it achieves the dual goals of improving seismic toughness and optimizing the entire life cycle cost.

Description

Technical Field

[0001] This invention belongs to the field of civil engineering technology, specifically relating to a reinforcement device and method for reinforced concrete columns. Background Technology

[0002] Under strong winds or earthquakes, excessive vibration, instability, and collapse of building structures can severely impact their safety and functionality. To enhance the wind and earthquake resistance of building structures, engineering practice often requires the installation of different types of vibration damping devices in the main structure. These specialized damping devices dissipate wind-induced vibration and seismic energy through active or passive mechanisms, thereby ensuring the stability and usability of the building structure.

[0003] However, traditional energy-dissipating and vibration-damping devices typically employ a single metal yielding, friction damping, or viscous energy dissipation mechanism, which has significant limitations in performance: under minor earthquakes or wind-induced vibrations, traditional energy-dissipating devices often fail to respond quickly due to excessively high activation requirements, resulting in poor structural vibration control; under major earthquakes, a single energy dissipation mechanism is prone to premature failure (such as metal fracture) or excessive deformation, leading to loss of load-bearing capacity, making it difficult to balance strength and ductility requirements; post-earthquake structures often experience irreversible deformation, requiring complex repairs or even demolition and reconstruction, severely impacting the restoration of building functions and economic efficiency. Summary of the Invention

[0004] In order to solve the problems existing in the prior art, the purpose of this invention is to provide a reinforcement device and method for reinforced concrete columns, which can provide efficient and reliable seismic protection, achieve the goal of controllable post-earthquake damage and rapid restoration of the main structure to its usability, and greatly improve the seismic toughness and economy of building structures.

[0005] The technical solution of this invention is: A reinforcement device for a reinforced concrete column, comprising: An outer positioning component is used to fit and fix itself into the annular groove of an existing reinforced concrete column, and there is a gap between the outer positioning component and the column base of the existing reinforced concrete column. Anchoring components are used to fit and fix the existing reinforced concrete column at its base. Multiple energy-consuming support components are evenly distributed around the outer positioning component, including a first pipe, a second pipe, an elastic pad, and an end plate. The second pipe is inclined and coaxially fitted inside the first pipe with a gap between them. Both ends of the second pipe extend out of the first pipe and are fitted with an elastic pad. An end plate is also fitted and fixed at both ends of the second pipe to press and abut against the end face of the first pipe. The end plate at the upper end of the second pipe is hinged to the outer positioning component, and the end plate at the lower end is hinged to the foundation at the bottom of the existing reinforced concrete column. Multiple prestressing application components correspond one-to-one with multiple energy-dissipating support components. Each prestressing application component includes a cable, a pulley, a first fixing member, and a second fixing member. The pulley is rotatably connected to the outer positioning component. One end of the cable is detachably connected to the anchoring component through the first fixing member, and the other end passes around the pulley and is detachably connected to the corresponding end plate through the second fixing member. A concrete reinforcement component includes a concrete reinforcement layer and a prestressed protective tube corresponding to each of the plurality of cables. The concrete reinforcement layer wraps around the outside of the existing reinforced concrete column, and the prestressed protective tube is inserted through the concrete reinforcement layer and fitted onto the corresponding cable.

[0006] Preferably, the outer positioning component includes a connecting sleeve and two limiting discs. Both the connecting sleeve and the limiting discs are designed as separate units. The connecting sleeve includes two semi-cylinders, and the limiting discs include two semi-circular annular discs. One semi-circular annular disc is coaxially fixed at each end of each semi-cylinder. The two semi-cylinders and the semi-circular annular discs located at the upper and lower ends of the two semi-cylinders are used to fix and form an integral sleeve structure that is fitted into the annular groove of the existing reinforced concrete column. A through hole is opened on the semi-circular annular disc located at the lower end of the semi-cylinder. The end plate at the upper end of the second pipe is hinged to the semi-cylinder, and the pulley is rotatably connected to the hinge shaft between the two.

[0007] Preferably, the anchoring assembly includes two half-sleeves and a semi-circular ring plate coaxially fixed to the lower end of each half-sleeve. The two half-sleeves and the two semi-circular ring plates are spliced ​​and fixed, and fitted onto the column base of the existing reinforced concrete column. The lower side of the semi-circular ring plate is fitted and fixedly connected to the foundation. The first fixing member is installed on the semi-circular ring plate.

[0008] Preferably, the first fixing component includes a screw, a locking pin, and an anchor head. The screw is vertically fixed to the semi-circular ring plate. The locking pin is conical, with embedded grooves arranged in a circular array along its sidewall. The anchor head is a hollow structure with an internal thread at one end and a conical shape at the other end. The locking pin is inserted into the anchor head and matches the conical cavity of the anchor head. The cable is a multi-strand wire structure, with one end inserted into the anchor head and the multiple strands of wire sequentially embedded in the embedded grooves on the locking pin. The screw is threaded to the internal thread of the anchor head and pushes the locking pin through the threaded screw to fasten the cable between the locking pin and the anchor head.

[0009] Preferably, the second fixing member includes an anchor sleeve and a clamping plate. The anchor sleeve is a hollow structure with a wedge-shaped hole, and the clamping plate is a hollow cone-shaped structure. The side wall of the clamping plate has a tightening gap along the axial direction, and the outer diameter of one end of the clamping plate is larger than the wedge-shaped hole of the anchor sleeve. One end of the cable is inserted through the clamping plate, and the end of the clamping plate with a smaller outer diameter is inserted into the wedge-shaped hole of the anchor sleeve. This is used to fasten the cable in the clamping plate through frictional self-locking between the clamping plate and the anchor sleeve. The anchor sleeve is inserted into the end plate at the upper end of the second pipe, and the two are fixed together.

[0010] Preferably, the upper end of the prestressed protective tube is fitted to the semi-circular annular disc with a through hole and connected by a snap fastener, the lower end of the prestressed protective tube is fitted onto the screw, and the diameter of the prestressed protective tube is greater than or equal to the through hole.

[0011] Preferably, the first pipe includes a pipe body and multiple ribs arranged along the axial direction of the pipe body. The ribs are arranged in a circumferential array with the axis of the pipe body as the center. One side of the rib is fixed to the pipe body, and a gap of 5mm to 10mm is reserved between the other side of the rib and the pipe wall of the second pipe.

[0012] Preferably, the ratio of the inner diameter of the prestressed protective pipe to the diameter of the cable is (2~3):1.

[0013] Preferably, the concrete reinforcement layer is made of concrete with a fiber volume content of 1.5% to 2%, and its thickness is 3 to 5 times the outer diameter of the prestressed protective pipe.

[0014] A method for strengthening a reinforced concrete column, implemented using the aforementioned strengthening device for reinforced concrete columns, includes the following steps: Cut an annular groove at a predetermined height above the ground on the existing reinforced concrete column, and keep the depth of the annular groove at 0.8 to 0.9 times its cross-sectional radius; The outer positioning component is fitted into the annular groove, the anchoring component is fitted at the column base of the existing reinforced concrete column, and the anchoring component is fixed to the bearing platform at the lower end of the existing reinforced concrete column. Install the energy-consuming support component, coaxially insert the second pipe into the first pipe, and install elastic pads at both ends of the second pipe that extend out of the first pipe. At the same time, install the fixed end plate to press the elastic pads against the end plate and the end face of the first pipe, while maintaining a preset gap between the second pipe and the first pipe. The second pipe is inclined as a whole with the first pipe, and the upper end plate of the second pipe is hinged to the outer positioning component, and the lower end plate is hinged to the foundation of the existing reinforced concrete column. The pulleys corresponding one-to-one with the second pipe are fixed to the outer positioning assembly in sequence; A prestressed protective tube is fitted onto each cable, and one end of the cable is connected to the anchoring assembly via a first fastener, while the other end passes around the corresponding pulley and is connected to the end plate via a second fastener. A modified concrete reinforcement layer is poured around the existing reinforced concrete column, ensuring that all prestressed protective pipes are encased within the concrete reinforcement layer.

[0015] Compared with the prior art, the reinforcement device and method for reinforced concrete columns of the present invention have the following beneficial effects: The reinforced concrete column reinforcement device and method provided by this invention effectively solves the core technical problems of traditional single energy-dissipating and vibration-damping devices, such as slow activation under small earthquakes, easy failure under large earthquakes, large residual deformation after earthquakes, and difficulty in repair. Specifically, by forming a solid constraint foundation in the key area of ​​the column through an external positioning component and an anchoring component, a stable force base point is provided for the entire reinforcement system. The energy-dissipating support component adopts a composite structure with a first pipe and a second pipe coaxially nested and elastic pads pressed at both ends. In practical applications, this structure achieves multi-level energy dissipation. Under strong winds or small and moderate earthquakes, the internal second pipe yields first to dissipate energy, while the external first pipe and elastic pads work together to provide elastic support and buffering, ensuring that the structure starts effective energy dissipation under small deformations. Under large earthquakes, when the elastic pads reach their deformation limit, the first pipe intervenes and enters the plastic stage together with the second pipe, forming a second energy-dissipating defense line, thereby avoiding premature failure of a single energy-dissipating mechanism. The system addresses the issues of failure due to fracture or excessive deformation, significantly improving energy dissipation capacity and structural ductility. Simultaneously, the prestressing application component connects the energy dissipation support to the anchoring system via pulley-guided cables. The pre-applied tension provides elastic restoring force to the existing concrete columns, enabling them to return to their initial vertical position when the structure tilts during an earthquake. This complements the plastic energy dissipation of the energy dissipation support component, working together to significantly reduce residual deformation after an earthquake. Furthermore, the combination of the concrete reinforcement layer and the prestressed protective pipe provides an unobstructed force transmission path for the cables and also serves as an outer defensive line contributing stiffness and strength. This creates a three-in-one collaborative working mechanism of "multi-level energy dissipation support + prestressed self-resetting + outer reinforcement layer," providing efficient and reliable seismic protection under various load conditions. It also achieves the goals of controllable post-earthquake damage and rapid restoration of the main structure's usability, greatly enhancing the seismic toughness and economy of the building structure. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure in an embodiment of the present invention; Figure 2 This is a longitudinal sectional view of the overall structure in an embodiment of the present invention; Figure 3 This is an exploded view of the outer positioning component in an embodiment of the present invention; Figure 4 This is a schematic diagram of the assembly structure of the outer positioning component in an embodiment of the present invention; Figure 5 This is an exploded structural diagram of the anchoring assembly in an embodiment of the present invention; Figure 6 This is a schematic diagram of the assembly structure of the anchoring component in an embodiment of the present invention; Figure 7 This is a schematic diagram of the structure of the double-ear connection part in an embodiment of the present invention; Figure 8 This is a schematic diagram of the hinge support in an embodiment of the present invention; Figure 9 This is a schematic diagram of the pulley structure in an embodiment of the present invention; Figure 10 This is a schematic diagram of the cable structure in an embodiment of the present invention; Figure 11 This is an exploded structural diagram of the first fixing member in an embodiment of the present invention; Figure 12 This is a schematic diagram of the assembly structure of the first fastener in an embodiment of the present invention; Figure 13 This is an exploded view of the second fastener in an embodiment of the present invention; Figure 14 This is a schematic diagram of the assembly structure of the second fastener in an embodiment of the present invention; Figure 15 This is an exploded structural diagram of the energy-consuming support component in an embodiment of the present invention; Figure 16 This is a cross-sectional view of the energy-consuming support component in an embodiment of the present invention; Figure 17 This is a schematic diagram of the assembly structure of the energy-consuming support component in an embodiment of the present invention; Figure 18 This is a longitudinal section diagram of the energy-consuming support component in an embodiment of the present invention.

[0017] Explanation of reference numerals in the attached figures: 1. Semi-cylinder; 2. First semi-circular annular disc; 3. Second semi-circular annular disc; 4. Connector; 5. Semi-sleeve; 6. Semi-circular annular plate; 7. Double-ear connector; 8. Hinge support; 9. Pulley; 10. Cable; 11. Screw; 12. Pin; 13. Anchor head; 14. Prestressed protective pipe; 15. Anchor sleeve; 16. Wedge; 17. Elastic pad; 18. End plate; 19. First pipe; 20. Second pipe; 21. Concrete reinforcement layer; 22. First bolt; 23. First nut; 24. Second bolt; 25. Second nut; 26. Expansion bolt. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0019] Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this invention.

[0020] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0021] See Figures 1 to 18 As shown, in order to address the problems of insufficient seismic performance and difficulty in post-earthquake repair of existing reinforced concrete columns, this embodiment provides a reinforcement device and method for reinforced concrete columns. It adopts multi-stage vibration reduction and energy dissipation and self-resetting technology to achieve the goal of reducing damage and restoring displacement. The device includes: an external positioning component, an anchoring component, an energy dissipation support component, a prestressing application component, and a concrete reinforcement component.

[0022] See Figures 2 to 4 As shown, the outer positioning component is used to fit and fix itself within the annular groove of the existing reinforced concrete column, and there is a gap between the outer positioning component and the column base of the existing reinforced concrete column. An annular groove is cut into the plastic hinge area of ​​the existing reinforced concrete column, typically within a range of 1.5 to 2 times the length of the plastic hinge below the column's net height.

[0023] The depth of the annular groove should be 0.8 to 0.9 times the radius of the existing reinforced concrete column cross-section; the embedding area of ​​the outer positioning component should be arranged within the length of the plastic hinge. The range is 1.5 to 2 times. The typical plastic hinge length of a reinforced concrete column is... The calculation formula is:

[0024] , In the formula, This indicates the clear height (m) of the reinforced concrete column. Indicates the yield strength (MPa) of the longitudinal reinforcement. Indicates the diameter (mm) of the longitudinal reinforcement.

[0025] like Figure 3 and Figure 4As shown, specifically, the outer positioning component includes a connecting sleeve and two limiting discs. Both the connecting sleeve and the limiting discs adopt a split design. The connecting sleeve includes two metal semi-cylinders 1, and the limiting discs include two metal semi-circular annular discs. A semi-circular annular disc is coaxially fixed to both ends of each semi-cylinder 1. The semi-circular annular disc located at the upper end of the semi-cylinder 1 is the first semi-circular annular disc 2, and the semi-circular annular disc located at the lower end of the semi-cylinder 1 is the second semi-circular annular disc 3. Several through holes with a diameter of 46mm to 65mm are arranged in a circumferential array on its sidewall for the subsequent passage of the cable 10. The two semi-cylinders 1 and the first and second semi-circular annular discs 2 and 3, which are arranged opposite each other on the two semi-cylinders 1, are fixed together by welding to form an integral sleeve structure, which fits into the annular groove of the existing reinforced concrete column.

[0026] See Figure 5 and Figure 6 As shown, the anchoring assembly is used to fix the existing reinforced concrete column at the column base position. It includes two half-sleeves 5 and a semi-circular ring plate 6 coaxially fixed to the lower end of each half-sleeve 5. The two half-sleeves 5 and the two semi-circular ring plates 6 are fixed into a whole cylindrical structure by welding. It is used to fit the existing reinforced concrete column at the column base position. The lower side of the semi-circular ring plate 6 is in contact with the foundation and fixedly connected by expansion bolts 26. The first fastener is installed on the semi-circular ring plate 6.

[0027] See Figures 15 to 18 As shown, further, multiple energy-consuming support components are provided, which are evenly distributed around the outer positioning component. These components include a first pipe 19, a second pipe 20, an elastic pad 17, and an end plate 18. The second pipe 20 is coaxially fitted inside the first pipe 19. The first pipe 19 is a ribbed metal pipe, which includes a pipe body and multiple ribs arranged along the axial direction of the pipe body. The ribs are arranged in a circumferential array with the axis of the pipe body as the center. One side of the rib is fixed to the pipe body, and the other side has a 5mm to 10mm gap between it and the pipe wall of the second pipe 20. Both ends of the second pipe 20 extend from the first pipe 19, and each is fitted with an elastic pad 17, which is a rubber annular pad. An end plate 18 is fixed to each end of the second pipe 20 to press and abut the rubber annular pads against the end faces of the first pipe 19. The second pipe 20 is inclined, with the upper end plate 18 hinged to the outer positioning assembly, and the lower end plate 18 hinged to the foundation of the existing reinforced concrete column. The upper end plate 18 of the second pipe 20 is hinged to the semi-cylinder 1, and a pulley 9 is rotatably connected to the hinge shaft between the two.

[0028] See Figures 2 to 14As shown, the prestressing application assembly further includes a cable 10, a pulley 9, a first fixing member, and a second fixing member. The pulley 9 is rotatably connected to the outer positioning assembly. One end of the cable 10 is detachably connected to the anchoring assembly via the first fixing member, and the other end passes around the pulley 9 and is detachably connected to the end plate 18 via the second fixing member. Figure 10 As shown, cable 10 has a multi-strand wire structure.

[0029] See Figure 2 and Figures 7 to 9 As shown, specifically, each second pipe 20 is provided with a hinged connector between itself and the connecting sleeve and the support. The hinged connector includes a connector head 4 and a double-eared connector 7. The connector head 4, which is fixed to the connecting sleeve, includes two opposing fixed ear plates. The two fixed ear plates are fixed perpendicularly to the connecting sleeve. A second bolt 24 is inserted through the two fixed ear plates. The second bolt 24 is rotatably connected to the fixed ear plates and has a second nut 25 screwed to one end. The double-eared connector 7 includes two connecting ear plates and a fixed plate. The two connecting ear plates are fixed opposite to each other on the fixed plate, and the two connecting ear plates are respectively placed on opposite sides of the two fixed ear plates. The connecting ear plates are fitted onto the second bolt 24 and rotatably connected to it. The fixed plate is detachably connected to the end plate 18 at the upper end of the second pipe 20 by a first bolt 22 and a first nut 23. In order to improve the connection stability and ensure that the subsequent force transmission is uniform and reliable, multiple first bolts 22 and first nuts 23 are preferably arranged in a circumferential array on the end plate 18. A pulley 9 is fitted onto a stud and the two are rotatably connected. The connector 4, which is fixed to the foundation, is set as a hinge support 8. First, the hinge support 8 is fixed to the foundation by a collision bolt. Then, the hinge support 8 is rotatably connected to the double-eared connector 7 at the lower end of the second pipe 20 by a second bolt 24 and a second nut 25.

[0030] See Figure 2As shown, the concrete reinforcement component includes a concrete reinforcement layer 21 and prestressed protective tubes 14 corresponding to each of the multiple cables 10. The concrete reinforcement layer 21 wraps around the outside of the existing reinforced concrete column, and the prestressed protective tubes 14 are inserted through the concrete reinforcement layer 21 and fitted onto the corresponding cables 10. Specifically, the concrete reinforcement layer 21 is poured to wrap around the outside of the existing reinforced concrete column, and the prestressed protective tubes 14 are inserted into the side wall of the concrete reinforcement layer 21 along the axial direction of the existing reinforced concrete. Before pouring, the corresponding prestressed protective tubes 14 are fitted onto each cable 10 to ensure that the upper end of the prestressed protective tube 14 is connected to the through hole on the second semi-circular annular disc 3. The concrete reinforcement layer 21 uses concrete with a fiber volume content of 1.5% to 2%, and its thickness is 3 to 5 times the outer diameter of the prestressed protective tube 14. The prestressed protective pipe 14 is prefabricated and fixed inside the concrete reinforcement layer 21. The lower end of the prestressed protective pipe 14 is fixed to the semi-circular ring plate 6, and the upper end is fixed to the second semi-circular ring plate 3 at the lower end of the connecting sleeve. The diameter of the prestressed protective pipe 14 is greater than or equal to the through hole. The ratio of the inner diameter of the prestressed protective pipe 14 to the diameter of the cable 10 is (2~3):1.

[0031] See Figure 11 and Figure 12 As shown, the first fixing component further includes a screw 11, a locking pin 12, and an anchor head 13. The screw 11 is vertically fixed on the semi-circular ring plate 6. The locking pin 12 is conical, and its sidewall has circumferentially arranged slots. The anchor head 13 is a hollow structure with an internal thread at one end and a conical shape at the other end. The locking pin 12 is inserted into the anchor head 13 and matches the conical cavity of the anchor head 13. The cable 10 is a multi-strand wire structure, with one end inserted into the anchor head 13 and the multi-strand wires are sequentially embedded in the slots on the locking pin 12. The screw 11 is screwed to the internal thread of the anchor head 13 and pushes the locking pin 12 through the thread to fasten the cable 10 between the locking pin 12 and the anchor head 13.

[0032] See Figure 13 and Figure 14 As shown, the second fixing member further includes an anchor sleeve 15 and a clamping plate 16. The anchor sleeve 15 is a hollow structure with a wedge-shaped hole, and the clamping plate 16 is a hollow cone-shaped structure. The side wall of the clamping plate 16 has a tightening gap along the axial direction, and the outer diameter of one end of the clamping plate 16 is larger than the wedge-shaped hole of the anchor sleeve 15. One end of the cable 10 is inserted through the clamping plate 16, and the end of the clamping plate 16 with a smaller outer diameter is inserted into the wedge-shaped hole of the anchor sleeve 15. This is used to fasten the cable 10 in the clamping plate 16 through frictional self-locking between the clamping plate 16 and the anchor sleeve 15. The anchor sleeve 15 is inserted into the end plate 18 at the upper end of the second pipe 20 and the two are fixed together.

[0033] See Figures 1 to 18 As shown, based on the above-mentioned reinforcement device for reinforced concrete columns, the concrete reinforcement method proceeds to the following steps: Step 1: Construction preparation and base surface treatment First, the existing reinforced concrete column is precisely measured and positioned. According to the design, an annular groove is cut into the plastic hinge area of ​​the existing reinforced concrete column (typically within 1.5 to 2 times the length of the plastic hinge below the column's net height). The depth of the annular groove should be precisely controlled to 0.8 to 0.9 times the thickness of the concrete cover to ensure effective interlocking between the old and new structures. Subsequently, the inner surface of the annular groove and the outer surface of the column are roughened, and dust and loose particles are thoroughly cleaned to create conditions for a firm bond with subsequent reinforcement materials.

[0034] Step 2: Install the external positioning and anchoring components Two semi-cylinders 1 of the outer positioning assembly and semi-circular annular disks welded to their ends are arranged together. Multiple through holes are arranged circumferentially on the semi-circular annular disk located at the lower end of the semi-cylinder 1, enclosing the outer metal sleeve. A rigid annular groove is formed by welding the joint. Subsequently, the connector 4 is welded to a predetermined position on the outer surface of the outer sleeve.

[0035] Simultaneously, anchoring components are installed at the column base. Two high-strength metal half-sleeves 5 and semi-circular ring plates 6 welded to their lower ends are wrapped around the column base, assembled, and then welded together. The semi-circular ring plates 6 are firmly fixed to the foundation platform using expansion bolts 26, and threaded rods 11 for connecting the cables 10 are pre-welded onto the semi-circular ring plates 6.

[0036] After the cable 10 is connected, a prestressed protective pipe 14 is installed between the outer positioning component and the anchoring component. The prestressed protective pipe 14 is a metal pipe with an inner diameter of 40 mm and a wall thickness of 3 mm. It is fitted onto the existing reinforced concrete column by welding. Its upper end is welded to a semi-circular ring with a through hole, and its lower end is welded to a semi-circular ring plate 6. It should be noted that a gap is reserved between the prestressed protective pipe 14 and the column body of the existing reinforced concrete column to facilitate the subsequent passage of the cable 10.

[0037] Step 3: Install and tension the prestressed cables 10. First, install the pulley 9 onto the connector 4 on the outer positioning assembly, that is, fit the pulley 9 onto the first bolt 22 inside the connector 4 and rotatably connect it with the first bolt 22.

[0038] Next, the lower end of the high-strength prestressed cable 10 is passed sequentially through the anchor head 13 and the conical locking pin 12, and its multiple strands of wire are embedded into the grooves of the locking pin 12. The anchor head 13 is rotated to tighten it with the screw 11 welded to the semi-circular ring plate 6 of the anchoring assembly, and the locking pin 12 is pushed by the thread to anchor the lower end of the cable 10. Then, a prestressed protective tube 14 is first installed on each cable, and then the upper end of the cable 10 is passed through the corresponding through hole on the semi-circular ring plate with an opening, and then turns around the pulley 9. Then, the upper end of the cable 10 is passed through the center hole of the double-ear connection part 7 at the upper end of the energy dissipation support assembly, and then inserted into the clamp 16 of the second fixing member. Friction self-locking is achieved by the wedge-shaped hole of the anchor sleeve 15, thereby completing the anchoring of the upper end of the cable 10 and the application of prestress. The upper and lower ends of the prestressed protective pipe 14 should be reliably connected to the perforated semi-circular annular disc and the anchoring assembly, respectively. Specifically, the upper end of the prestressed protective pipe 14 is snapped into the perforated semi-circular annular disc, and the lower end is fixed to the bolt of the anchoring assembly. It should be ensured that the ratio of the inner diameter of the prestressed protective pipe 14 to the diameter of the cable 10 is controlled between 2:1 and 3:1. It should be noted that, for ease of cable 10 installation, the installation of the cable 10 should proceed in conjunction with the installation of the outer fixing assembly, the anchoring assembly, and the prestressed protective pipe 14.

[0039] Step 4: Assemble and install the energy-consuming support components Pre-assembly of the energy-dissipating support: The second pipe 20 is coaxially inserted into the first pipe 19, ensuring a gap of 5mm to 10mm between them. This means the ribs inside the first pipe 19 and the wall of the second pipe 20 maintain a 5mm to 10mm gap during installation. At each end of the second pipe 20 extending beyond the first pipe 19, a rubber ring pad is fitted, ensuring the side of the pad contacts the end face of the first pipe 19. Subsequently, two end plates 18 are welded to both ends of the second pipe 20, thereby tightly pressing the rubber ring pads between the end face of the first pipe 19 and the end plates 18, forming a complete bimetallic pipe-jacketed rubber energy-dissipating support. Under strong winds or minor to moderate earthquakes, the second pipe 20 yields first and dissipates energy, while the first pipe 19 only deforms the rubber ring pad and does not play a role in energy dissipation and shock absorption. Under a major earthquake, the rubber ring pad reaches its deformation limit, and the first pipe 19 enters the yielding state, thereby further playing a role in energy dissipation and shock absorption. At the same time, the first pipe 19 and the second pipe 20 are replaceable components, and the energy dissipation and shock absorption function can be restored after the earthquake by replacing the components.

[0040] The assembled multiple energy-consuming support components, namely the pipe body consisting of the second pipe 20 and the first pipe 19, are tilted into place, with the upper end plate 18 hinged to the connector 4 on the outer positioning component via the double-ear connector 7, and the lower end plate 18 hinged to the hinge support 8 fixed on the bearing platform. During this process, the anchor sleeve 15 is inserted into the upper end plate 18 of the second pipe 20, and the two are fixed by welding.

[0041] Step 5: Pour the modified concrete reinforcement layer 21 Finally, on the outside of the prestressed protective pipe 14, within the annular space formed by the outer edge of the second semi-circular annular disc 3 to the outer edge of the semi-circular annular plate 6 at the base of the existing reinforced concrete column, modified concrete is continuously poured to form a concrete reinforcement layer 21. The poured concrete should preferably be modified with materials such as ultra-high performance concrete with a fiber volume ratio of 1.5% to 2.0%, and the thickness of the concrete reinforcement layer 21 should be controlled to be 3 to 5 times the outer diameter of the prestressed protective pipe 14. To enhance bonding performance, an epoxy resin or polymer-modified cementitious adhesive can be applied to the outer surface of the prestressed protective pipe 14 before pouring. Once the concrete has cured to the design strength, the entire reinforcement project is complete.

[0042] Based on the application examples of the above methods, the following are some examples: Fixed sleeves and anchors. The surface of the original concrete column is roughened and dust is cleaned to ensure that the reinforcement material is firmly bonded. An annular groove is pre-cut and chiseled into the existing reinforced concrete column, with a depth of 0.9 times the thickness of the existing reinforced concrete protective layer; the annular groove area is located at 1.5 times the length of the plastic hinge. The upper and lower ends of the two semi-cylinders 1 are welded to the first semi-circular annular disk 2 and the second semi-circular annular disk 3, respectively, and arranged in the annular groove pre-cut and chiseled into the existing reinforced concrete column. The two metal semi-cylinders 1 are welded together to form an outer positioning assembly, and the connector 4 is welded to the middle position of the outer surface of the semi-cylinder 1. The lower ends of two high-strength metal semi-sleeves 5 are welded to high-strength metal semi-circular ring plates 6 and spliced ​​at the existing reinforced concrete column base. Welding is carried out at the splice joint to form an anchoring component. The anchoring component is fixed to the bearing platform by expansion bolts 26 through the bolt holes reserved in the semi-circular ring plate 6, and screw rods 11 are welded at the bolt hole intervals of the semi-circular ring plate 6.

[0043] 3) Connecting the double-ear connecting parts 7. The double-ear connecting parts 7 at both ends of the energy dissipation support assembly are respectively hinged to the connector 4 and the hinge support 8 through the second bolt 24 and the second nut 25. The hinge support 8 is anchored to the bearing platform by the expansion bolt 26 through the reserved bolt holes;

[0044] 4) Tensioning of 10 high-strength prestressed cables. The cable 10 is made of multiple strands of high-strength wire with a radius of 8 mm. The lower end of the cable 10 passes through the small opening of the anchor head 13, and its high-strength wire strands are sequentially embedded in the groove of the locking pin 12. After being tensioned by pulling upwards, the cable 10 is fixed to the screw 11 by rotating the anchor head 13. The upper end of the cable 10 passes through the prestressed protective tube 14 with an inner diameter of 40 mm and a wall thickness of 3 mm and the circular through hole with a diameter of 46 mm reserved on the second semi-circular disc 3. Then, it passes around the pulley 9 with a diameter of 80 mm set in the middle of the connector 4 to achieve deflection. It passes through the central circular hole with a diameter of 40 mm set on the double-ear connection part 7 at the upper end of the energy dissipation support component and is anchored by friction self-locking of the anchor sleeve 15 and the clamp 16 to apply prestress. At the same time, the upper end of the prestressed protective tube 14 is coaxially connected to the circular hole reserved in the second semi-circular disc 3, and the lower end extends to the surface of the semi-circular disc 6 and is fitted with the screw 11.

[0045] 5) Connecting the energy-dissipating support. The second pipe 20, with an outer diameter of 60 mm and a wall thickness of 4 mm, and the end plate 18, with a diameter of 120 mm, are both made of low-yield-point metal. The first pipe 19, with an outer diameter of 100 mm, a wall thickness of 6 mm, and an inner diameter of 10 mm, is made of high-strength metal. The second pipe 20 is coaxially fitted inside the first pipe 19, with a rubber ring pad with an outer diameter of 120 mm and an inner diameter of 60 mm fitted at each end, ensuring that the sides of the rubber ring pads at both ends are in contact with the end face of the first pipe 19. Both end plates 18 are welded to both ends of the second pipe 20, so that the rubber ring pads are tightly pressed between the end face of the first pipe 19 and the inner side of the end plate 18, thus forming a bimetallic pipe-jacketed rubber energy-dissipating support. The end plates 18 and the double-ear connection parts 7 at both ends of the energy-dissipating support are connected by bolts and nuts to form an energy-dissipating support system.

[0046] 6) Pouring modified concrete (concrete reinforcement layer). Within the annular space formed by the outer edge of the second semi-circular disc 3 and the outer edge of the column base semi-circular plate 6, a modified concrete layer is continuously poured for further reinforcement. The concrete used in the modified concrete reinforcement layer 21 is ultra-high performance concrete or other modified concrete with fibers to improve its crack resistance and toughness, with a fiber volume content of 1.8%. The modified concrete reinforcement layer 21 is placed outside the prestressed protective pipe 14, and its thickness is four times the outer diameter of the prestressed protective pipe 14. Simultaneously, an epoxy resin adhesive or polymer-modified cement-based adhesive is pre-coated onto the surface of the existing reinforced concrete column to enhance the bonding performance between the modified concrete reinforcement layer 21 and the original column. After the concrete reaches its design strength, the method for reinforcing an existing reinforced concrete column based on additional prestressed cables 10 and a composite energy dissipation device described in this invention is fully completed.

[0047] Under strong winds or minor to moderate earthquakes, the aforementioned reinforcement method primarily utilizes the second pipe 20 in the bimetallic tube sandwich rubber energy-dissipating brace to dissipate seismic energy through yielding deformation, while the modified concrete reinforcement layer 21 collaboratively provides lateral stiffness and participates in some energy dissipation. Under major earthquakes, the rubber ring cushion reaches its deformation limit, and the first pipe 19, the second pipe 20, and the modified concrete reinforcement layer 21 jointly exert energy dissipation and vibration reduction effects. The high-strength prestressed cable 10 reduces the residual deformation of the reinforced concrete column through pre-applied prestress, achieving self-resetting. After an earthquake, only the bimetallic tube sandwich rubber energy-dissipating brace needs to be replaced to restore functionality. This multi-protection strategy not only significantly improves the seismic toughness of the building structure but also achieves the goal of rapidly restoring its usability after an earthquake.

[0048] Specifically, by using external positioning and anchoring components to form a robust constraint foundation in key areas of the column, a stable load-bearing base is provided for the entire reinforcement system. The energy dissipation support component adopts a composite structure with a first pipe 19 and a second pipe 20 coaxially nested and with rubber ring pads pressed at both ends. In practical applications, this structure achieves multi-stage energy dissipation. Under strong winds or minor to moderate earthquakes, the internal second pipe 20 yields first to dissipate energy, while the external first pipe 19 and rubber ring pads work together to provide elastic support and buffering, ensuring that the structure starts effective energy dissipation even with small deformations. Under major earthquakes, when the rubber ring pads reach their deformation limit, the first pipe 19 intervenes, entering the plastic stage together with the second pipe 20, forming a second energy dissipation defense line. This avoids the problem of a single energy dissipation mechanism failing due to premature fracture or excessive deformation, significantly improving energy dissipation capacity and structural ductility. Simultaneously, prestressing... The force application component connects the energy dissipation support to the anchoring system via the pulley 9 and the cable 10. The pre-applied tension provides an elastic restoring force to restore the existing concrete column to its initial vertical state when the structure tilts due to an earthquake. This complements the plastic energy dissipation of the energy dissipation support component, and together they can significantly reduce the residual deformation of the structure after the earthquake. In addition, the gap between the concrete reinforcement layer 21 and the column and the installation of the prestressed protective pipe 14 not only provide an unobstructed force transmission path for the cable 10, but also contribute stiffness and strength as an outer defense line. This makes the device form a three-in-one collaborative working mechanism of "multi-level energy dissipation support + prestressed self-resetting + outer reinforcement layer". It can not only provide efficient and reliable seismic protection under various load conditions, but also achieve the goal of controllable post-earthquake damage and rapid restoration of the main structure to its usability, greatly improving the seismic toughness and economy of the building structure.

[0049] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A reinforcement device for a reinforced concrete column, characterized in that, include: An outer positioning component is used to fit and fix itself into the annular groove of an existing reinforced concrete column, and there is a gap between the outer positioning component and the column base of the existing reinforced concrete column. Anchoring components are used to fit and fix the existing reinforced concrete column at its base. Multiple energy-consuming support components are evenly distributed around the outer positioning component, including a first pipe, a second pipe, an elastic pad, and an end plate. The second pipe is inclined and coaxially fitted inside the first pipe with a gap between them. Both ends of the second pipe extend out of the first pipe and are fitted with an elastic pad. An end plate is also fitted and fixed at both ends of the second pipe to press and abut against the end face of the first pipe. The end plate at the upper end of the second pipe is hinged to the outer positioning component, and the end plate at the lower end is hinged to the foundation at the bottom of the existing reinforced concrete column. Multiple prestressing application components correspond one-to-one with multiple energy-dissipating support components. Each prestressing application component includes a cable, a pulley, a first fixing member, and a second fixing member. The pulley is rotatably connected to the outer positioning component. One end of the cable is detachably connected to the anchoring component through the first fixing member, and the other end passes around the pulley and is detachably connected to the corresponding end plate through the second fixing member. A concrete reinforcement component includes a concrete reinforcement layer and a prestressed protective tube corresponding to each of the plurality of cables. The concrete reinforcement layer wraps around the outside of the existing reinforced concrete column, and the prestressed protective tube is inserted through the concrete reinforcement layer and fitted onto the corresponding cable.

2. The reinforcement device for a reinforced concrete column according to claim 1, characterized in that, The outer positioning assembly includes a connecting sleeve and two limiting discs. Both the connecting sleeve and the limiting discs adopt a split design. The connecting sleeve includes two semi-cylinders, and the limiting discs include two semi-circular annular discs. One semi-circular annular disc is coaxially fixed at both ends of each semi-cylinder. The two semi-cylinders and the semi-circular annular discs located at the upper and lower ends of the two semi-cylinders are used to fix and form an integral sleeve structure that is fitted into the annular groove of the existing reinforced concrete column. A through hole is opened on the semi-circular annular disc located at the lower end of the semi-cylinder. The end plate at the upper end of the second pipe is hinged to the semi-cylinder, and the pulley is rotatably connected to the hinge shaft between the two.

3. The reinforcement device for a reinforced concrete column according to claim 1, characterized in that, The anchoring assembly includes two half-sleeves and a semi-circular ring plate coaxially fixed to the lower end of each half-sleeve. The two half-sleeves and the two semi-circular ring plates are spliced ​​and fixed, and are fitted onto the column base of the existing reinforced concrete column. The lower side of the semi-circular ring plate is in contact with and fixedly connected to the foundation, and the first fixing member is installed on the semi-circular ring plate.

4. The reinforcement device for a reinforced concrete column according to claim 3, characterized in that, The first fixing component includes a screw, a locking pin, and an anchor head. The screw is vertically fixed to the semi-circular ring plate. The locking pin is conical, with embedded grooves arranged in a circular array along its sidewall. The anchor head is a hollow structure with an internal thread at one end and a conical shape at the other end. The locking pin is inserted into the anchor head and matches the conical cavity of the anchor head. The cable is a multi-strand wire structure, with one end inserted into the anchor head and the multiple strands of wire sequentially embedded in the embedded grooves on the locking pin. The screw is threaded to the internal thread of the anchor head and pushes the locking pin through the thread to fasten the cable between the locking pin and the anchor head.

5. The reinforcement device for a reinforced concrete column according to claim 1, characterized in that, The second fixing component includes an anchor sleeve and a clamping plate. The anchor sleeve is a hollow structure with a wedge-shaped hole, and the clamping plate is a hollow cone-shaped structure. The side wall of the clamping plate has a tightening gap along the axial direction, and the outer diameter of one end of the clamping plate is larger than the wedge-shaped hole of the anchor sleeve. One end of the cable is inserted through the clamping plate, and the end of the clamping plate with a smaller outer diameter is inserted into the wedge-shaped hole of the anchor sleeve. The cable is fastened in the clamping plate by frictional self-locking between the clamping plate and the anchor sleeve. The anchor sleeve is inserted into the end plate at the upper end of the second pipe, and the two are fixed together.

6. The reinforcement device for a reinforced concrete column according to claim 4, characterized in that, The upper end of the prestressed protective tube is fitted to the semi-circular annular disc with a through hole and connected by a snap fastener. The lower end of the prestressed protective tube is fitted onto the screw, and the diameter of the prestressed protective tube is greater than or equal to the through hole.

7. The reinforcement device for a reinforced concrete column according to claim 1, characterized in that, The first pipe includes a pipe body and multiple ribs arranged along the axial direction of the pipe body. The ribs are arranged in a circumferential array with the axis of the pipe body as the center. One side of the rib is fixed to the pipe body, and the other side has a gap of 5mm to 10mm between it and the wall of the second pipe.

8. The reinforcement device for a reinforced concrete column according to claim 6, characterized in that, The ratio of the inner diameter of the prestressed protective pipe to the diameter of the cable is (2~3):

1.

9. A reinforcement device for a reinforced concrete column according to claim 6, characterized in that, The concrete reinforcement layer uses concrete with a fiber volume content of 1.5% to 2%, and its thickness is 3 to 5 times the outer diameter of the prestressed protective pipe.

10. A method for reinforcing a reinforced concrete column, implemented according to the reinforcing device for a reinforced concrete column as described in any one of claims 1-9, characterized in that, Includes the following steps: Cut an annular groove at a predetermined height above the ground on the existing reinforced concrete column, and keep the depth of the annular groove at 0.8 to 0.9 times its cross-sectional radius; The outer positioning component is fitted into the annular groove, the anchoring component is fitted at the column base of the existing reinforced concrete column, and the anchoring component is fixed to the bearing platform at the lower end of the existing reinforced concrete column. Install the energy-consuming support component, coaxially insert the second pipe into the first pipe, and install elastic pads at both ends of the second pipe that extend out of the first pipe. At the same time, install the fixed end plate to press the elastic pads against the end plate and the end face of the first pipe, while maintaining a preset gap between the second pipe and the first pipe. The second pipe is inclined as a whole with the first pipe, and the upper end plate of the second pipe is hinged to the outer positioning component, and the lower end plate is hinged to the foundation of the existing reinforced concrete column. The pulleys corresponding one-to-one with the second pipe are fixed to the outer positioning assembly in sequence; A prestressed protective tube is fitted onto each cable, and one end of the cable is connected to the anchoring assembly via a first fastener, while the other end passes around the corresponding pulley and is connected to the end plate via a second fastener. A modified concrete reinforcement layer is poured around the existing reinforced concrete column, ensuring that all prestressed protective pipes are encased within the concrete reinforcement layer.

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