Reinforcing method for damaged bridge pier

Abstract

The invention relates to a method for reinforcing a damaged pier, and belongs to the technical field of bridge pier column protection. External concrete on the upper side and the lower side of a damaged position of a bridge pier is chiseled out to form longitudinal bar exposed sections, then bent steel bars and first components are arranged on the longitudinal bar exposed sections, then second components are arranged at the upper end and the lower end of a to-be-reinforced section of the bridge pier respectively, a steel reinforcement cage is arranged between the two second components, and the steel reinforcement cage is welded to the first components. And then concrete is poured. Through the combination of the second component and the bending steel bar, the force on the original longitudinal bar is transmitted to the newly-added longitudinal bar, the stress mode of the damaged pier column is improved, the strong compression resistance and bending resistance are provided for the pier column, and meanwhile, the combination problem of the newly-added structure and the original structure in the section increasing method is improved through the newly-added steel bar framework.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge pier protection, and in particular to a method for reinforcing a damaged bridge pier. Background Art

[0002] When bridge piers are subjected to extreme loads such as explosions, floods, and collisions with external objects, or when construction and maintenance are not carried out in accordance with regulations, the concrete cover of the piers can crack, break, and fall off, exposing the internal steel bars. This can even lead to the core concrete of the piers breaking, internal steel bars shifting, and the piers deviating from their original axis, compromising the safety and reliability of the bridge. Therefore, reinforcement measures are necessary to ensure the safety and reliability of the piers.

[0003] In existing technologies, repairing concrete bridge piers typically involves directly sealing damaged areas with repair glue or cement mortar. This simple approach not only fails to ensure a tight bond between the new and old materials, but also quickly leads to cracks in the repaired materials. Furthermore, existing technologies typically reinforce concrete bridge piers by increasing their cross-sections, pouring concrete around them to increase their cross-section and restore their bearing capacity. This, however, presents challenges with the coordination of forces between the new and old concrete. Specifically, the new and old concrete only maintain a certain bond at the contact surface, resulting in a reduction in the supporting performance of the newly added concrete structure. Summary of the Invention

[0004] In order to solve or partially solve the problems existing in the related art, the present invention provides a method for reinforcing a damaged bridge pier, aiming to solve the technical problem of how to reinforce a damaged bridge pier.

[0005] The above-mentioned method for reinforcing a damaged bridge pier specifically includes the following steps: S1: roughening the surface concrete of the section to be reinforced of the pier; installing first annular components at the upper and lower ends of the section to be reinforced of the pier; S2: Chisel out the concrete on both sides of the severely damaged area in the section of the pier to be reinforced until the original longitudinal reinforcement at the outermost layer of the pier is exposed, forming an exposed longitudinal reinforcement section; then install the first component on the outer side of the exposed longitudinal reinforcement section; S3: Welding the bent steel bars to the original longitudinal bars of the exposed longitudinal bar section, wherein the bent steel bars have a first vertical connecting section and a second vertical connecting section that are parallel to each other, the first vertical connecting section being welded to the original longitudinal bars, and the second vertical connecting section being welded to the second component; one end of the first vertical connecting section and one end of the second vertical connecting section being integrally connected via an inclined connecting section; the bent steel bars are evenly spaced along the circumference of the pier; S4: Building a steel cage between two of the first components, and welding the steel cage to the two first components and all of the second components respectively; S5: Build formwork on the outside of the steel cage and pour concrete.

[0006] In some embodiments, first welding strips are evenly spaced around the circumference of the outer surface of the first component, and the first welding strips are arranged in a one-to-one correspondence with the new longitudinal bars of the steel cage.

[0007] In some embodiments, a support plate is provided at the bottom of the first welding rod.

[0008] In some embodiments, the first component is composed of two semicircular first sub-components, and first connecting plates are respectively provided at both ends of the first sub-components.

[0009] In some embodiments, the bent steel bar has two first vertical connecting sections, and the two first vertical connecting sections are respectively located on the upper and lower sides of the second vertical connecting section.

[0010] In some embodiments, the angle between the first vertical connecting section and the inclined connecting section is 100 degrees to 140 degrees.

[0011] In some solutions, in step S2, exposed longitudinal reinforcement sections may be chiseled out at even intervals along the section of the pier to be reinforced.

[0012] In some embodiments, second welding strips are evenly spaced around the circumference of the outer surface of the second member, and the second welding strips are arranged in a one-to-one correspondence with the new longitudinal bars of the steel cage.

[0013] In some embodiments, a hollow hole is provided at the bottom of the first component.

[0014] The technical solution provided by the present invention can have the following beneficial effects: The present invention transfers the force on the original longitudinal reinforcement to the newly added longitudinal reinforcement through the combination of the second component and the bent steel bars, thereby improving the stress mode of the damaged pier column and providing the pier column with strong compression and bending resistance. At the same time, the newly added steel bar structure improves the combination problem of the newly added structure and the original structure in the increased cross-section method.

[0015] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and other objects, features and advantages of the present invention will become more apparent through a more detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings, wherein like reference numerals generally represent like components throughout the exemplary embodiments of the present invention.

[0017] Figure 11 is a structural schematic diagram of a method for reinforcing a damaged pier, showing partial repair and overall repair according to an embodiment of the present invention; Figure 2 Schematic diagram of a first component and a second component of a method for reinforcing a damaged pier shown in an embodiment of the present invention; Figure 3 yes Figure 1 A magnified view of point A; Figure 4 1 is a schematic structural diagram of a first component of a method for reinforcing a damaged pier according to an embodiment of the present invention; Figure 5 1 is a schematic structural diagram of bent steel bars in a method for reinforcing a damaged bridge pier according to an embodiment of the present invention; Figure 6 1 is a schematic structural diagram of a second component of a method for reinforcing a damaged pier according to an embodiment of the present invention; Reference numerals: 1. Bridge pier; 11. Original longitudinal reinforcement; 12. Exposed longitudinal reinforcement section; 2. First component; 21. First welding strip; 22. Support plate; 23. First sub-component; 24. First connecting plate; 25. Hollow hole; 3. Bent steel bars; 31. First vertical connecting section; 32. Second vertical connecting section; 33. Inclined connecting section; 4. Second component; 41. Second welding strip; 42. Second sub-component; 43. Second connecting plate; 5. Steel cage; 51. New longitudinal reinforcement; 52. New stirrups. DETAILED DESCRIPTION

[0018] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments, but the protection scope of the present invention is not limited to the contents described above.

[0019] like Figures 1-6 As shown, the present application provides a method for reinforcing a damaged bridge pier, which specifically includes the following steps: S1: The surface concrete of the section to be reinforced of the pier 1 is roughened to increase the bonding strength between the new and old concretes and ensure the stability of the structure. The length of the section to be reinforced is determined according to the damage assessment result of the pier 1. The reinforcement range can be a part of the pier 1 or the entire pier 1. An annular first component 2 is installed at the upper and lower ends of the section to be reinforced of the pier 1. Specifically, the first component 2 is made of metal material. A through hole extending in the radial direction is opened on the first component 2. After the expansion bolt passes through the through hole, it is fixedly connected to the section to be reinforced of the pier 1, thereby realizing the connection between the first component 2 and the section to be reinforced of the pier 1. Preferably, the through holes are evenly spaced along the circumference of the first component 2. In this way, the first component 2 is connected to the pier 1 by setting a plurality of expansion bolts, which effectively increases the connection strength between the two.

[0020] S2: Chisel out the concrete above and below the severely damaged area of the section to be reinforced in pier 1 until the original outermost longitudinal reinforcement 11 of pier 1 is exposed, forming an exposed longitudinal reinforcement section 12. Specifically, in exposed longitudinal reinforcement section 12, all the surface concrete is chiseled out, exposing the outermost longitudinal reinforcement. Then, install the second component 4 on the outer side of exposed longitudinal reinforcement section 12.

[0021] S3: Weld the bent steel bar 3 to the original longitudinal bar 11 of the exposed longitudinal bar section 12, wherein the shape of the bent steel bar 3 is as follows: Figure 1 As shown, the bent steel bar 3 has a first vertical connecting section 31 and a second vertical connecting section 32 parallel to each other, the first vertical connecting section 31 is welded to the original longitudinal reinforcement 11, and the second vertical connecting section 32 is welded to the second component 4; specifically, the first vertical connecting section 31 is placed close to the original longitudinal reinforcement 11 of the exposed longitudinal reinforcement section 12, and then the first vertical connecting section 31 and the original longitudinal reinforcement 11 are welded into one by double-sided welding; one end of the first vertical connecting section 31 and one end of the second vertical connecting section 32 are connected into one by an inclined connecting section 33; the bent steel bars 3 are evenly spaced along the circumferential direction of the pier 1, and the number of bent steel bars 3 can be set according to the number of original longitudinal reinforcements 11 of the exposed longitudinal reinforcement section 12, that is, one bent steel bar 3 is welded to the original longitudinal reinforcement 11 of each exposed longitudinal reinforcement section 12.

[0022] The second component 4 is made of metal material, and the height of the second component 4 matches the length of the second vertical connecting section 32; the outer diameter of the second component 4 is equal to the inner diameter of the circular ring structure surrounded by the second vertical connecting sections 32 of all the bent steel bars 3, and the second component 4 is placed on the inner side of the circular ring structure surrounded by the second vertical connecting sections 32 of all the bent steel bars 3; in step 2, when installing the second component 4, three bent steel bars 3 can be used to first basically fix the position of the second component 4, and then install other bent steel bars 3.

[0023] S4: A steel cage 5 is built between the two first components 2, and the steel cage 5 is welded to the two first components 2 and all the second components 4 respectively. Specifically, the steel cage 5 is composed of new longitudinal bars 51 and new stirrups 52, and the new longitudinal bars 51 and the new stirrups 52 are connected as one by welding, and the new longitudinal bars 51 are welded to the second components 4.

[0024] S5: Build a formwork outside the steel cage 5 and pour concrete. After the concrete solidifies, remove the formwork to complete the reinforcement of the bridge pier 1.

[0025] The present application transfers the force on the original longitudinal reinforcement 11 to the new longitudinal reinforcement 51 through the second component 4, thereby improving the stress mode of the damaged pier column, providing the pier column with strong compression and bending resistance, and improving the combination problem of the new structure and the original structure in the cross-section increase method; in terms of pier column treatment, the present application causes less damage to the original pier column, and the construction is relatively simple. It is only necessary to perform deep excavation at the installation position of the second component 4 to expose the internal steel bars, and the rest of the pier column only needs to be roughened on the surface. This greatly increases the contact area between the new and old concrete, and increases the mechanical properties of the structure while achieving simple construction.

[0026] Compared with the traditional rebar planting method, this application uses components and bent steel bars 3 to weld the newly added steel bars to the original steel bar skeleton, establishes a mechanical connection between the newly added steel bars and the original steel bars, and improves the integrity of the repaired structure. Therefore, this method has stronger mechanical properties than the traditional rebar planting method.

[0027] Traditional methods can damage concrete during the drilling process. If the concrete is severely damaged after drilling, re-drilling is necessary, and there is a chance that there will be no undamaged concrete to drill. This method uses a streamlined construction method and standardized components to ensure construction stability, making it more feasible than traditional methods.

[0028] In this embodiment, first welding strips 21 are evenly spaced around the circumferential direction on the outer surface of the first component 2. The first welding strips 21 are arranged in a one-to-one correspondence with the new longitudinal reinforcement 51 of the steel cage 5. During installation, the first welding strips 21 and the new longitudinal reinforcement 51 are welded into one by single-sided welding or double-sided welding to achieve the connection between the first component 2 and the steel cage 5. Compared with directly welding the first component 2 to the steel cage 5, this method can effectively avoid the technical problem of deformation of the first component 2 or weakening of the structural strength during welding.

[0029] In this embodiment, a support plate 22 is provided at the bottom of the first welding strip 21. When installing the steel cage 5, the new longitudinal reinforcement 51 can be placed on the support plate 22 first and welded firmly, and then the new stirrups 52 can be installed. This makes the installation of the steel cage 5 more convenient when the pier 1 is partially reinforced. At the same time, when the pier 1 is reinforced as a whole, the provision of the support plate 22 increases the contact area with the original base of the pier 1.

[0030] In this embodiment, the first component 2 is composed of two semi-circular first sub-components 23, and a first connecting plate 24 is provided at both ends of the first sub-component 23. When in use, the two first sub-components 23 are combined into a circular ring, and then high-strength bolts are used to pass through the first connecting plates 24 of the two first sub-components 23 in sequence and then screwed with nuts to complete the assembly of the first component 2. By dividing the first component 2 into two first sub-components 23, the installation of the first component 2 is facilitated.

[0031] In this embodiment, the bent steel bar 3 has two first vertical connecting sections 31, and the two first vertical connecting sections 31 are respectively located on the upper and lower sides of the second vertical connecting section 32. When in use, the two first vertical connecting sections 31 are respectively welded to the original longitudinal reinforcement 11 of the pier 1. Compared with the straight reinforcement, this solution has the following advantages: 1. The two ends of the steel bar of this shape can be welded, and the connection is more firm; 2. It has strong integrity and can ensure the stability of the structure after repair; 3. The operability of welding construction is better than that of straight reinforcement; 4. The torsional stiffness after welding is better than that of straight reinforcement.

[0032] The combination of the bent steel bar 3 and the second component 4 has the following advantages compared to the technical solution of directly adding embedded steel bars to the pier 1: 1. It has a larger moment of inertia on the plane, which can significantly improve the mechanical properties of the bridge structure after repair; 2. Compared with the repair solution using straight steel bars, this solution can achieve less concrete excavation, which to a certain extent ensures the integrity of the structure; 3. Under the same amount of concrete excavation, compared with the traditional solution, this solution can weld longer longitudinal steel bars, which can reduce construction costs; 4. A single steel bar in this solution has multiple welding points, which has a higher connection with the original longitudinal bars of the original pier column than the traditional solution, thereby ensuring the coordinated force of the new structure and the original structure; 5. Compared with the traditional solution, this solution has a larger steel cage 5, which can cast concrete with a larger cross-section, and thus has a higher compressive resistance than the original pier column.

[0033] In this embodiment, the included angle between the first vertical connecting section 31 and the inclined connecting section 33 is 100 degrees to 140 degrees, such as 100 degrees, 110 degrees, 120 degrees, 130 degrees, 140 degrees, and any angle between 100 degrees and 140 degrees.

[0034] In this embodiment, in step S2 , exposed longitudinal reinforcement sections 12 may be chiseled out at even intervals along the section to be reinforced of the pier 1 , as long as the exposed longitudinal reinforcement sections 12 do not overlap with the severely damaged portion of the pier 1 .

[0035] In this embodiment, second welding strips 41 are evenly spaced on the outer surface of the second component 4 around its circumferential direction. The second welding strips 41 are arranged in a one-to-one correspondence with the new longitudinal reinforcement 51 of the steel cage 5. During installation, the second welding strips 41 and the new longitudinal reinforcement 51 are welded into one by single-sided welding or double-sided welding to achieve the connection between the second component 4 and the steel cage 5. Compared with directly welding the second component 4 to the steel cage 5, this method can effectively avoid the technical problem of deformation of the second component 4 or weakening of the structural strength during welding.

[0036] In this embodiment, the second component 4 is composed of two semi-circular second sub-components 42, each with a second connecting plate 43 at each end. During use, the two second sub-components 42 are combined to form a circular ring. High-strength bolts are then passed through the second connecting plates 43 of the two second sub-components 42 in sequence and screwed together with nuts to complete the assembly of the second component 4. By dividing the second component 4 into two second sub-components 42, installation of the second component 4 is facilitated.

[0037] In this embodiment, a hollow hole 25 is provided at the bottom of the first component 2 to reduce the difficulty of pouring additional concrete.

[0038] While various embodiments of the present invention have been described above, the foregoing description is intended to be illustrative, non-exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is selected to best explain the principles of the embodiments, their practical applications, or improvements to existing technologies, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A method for reinforcing a damaged bridge pier, characterized by: Specifically include the following steps: S1: roughening the surface concrete of the section to be reinforced of the pier (1); installing an annular first component (2) at the upper and lower ends of the section to be reinforced of the pier (1); S2: chiseling out the concrete on both sides of the upper and lower sides of the severely damaged position in the section to be reinforced of the pier (1) until the original longitudinal reinforcement (11) located at the outermost layer of the pier (1) is exposed to the outside, forming an exposed longitudinal reinforcement section (12); and fitting a second component (4) on the outer side of the exposed longitudinal reinforcement section (12); S3: Welding the bent steel bar (3) to the original longitudinal bar (11) of the exposed longitudinal bar section (12), wherein the bent steel bar (3) has a first vertical connecting section (31) and a second vertical connecting section (32) parallel to each other, the first vertical connecting section (31) is welded to the original longitudinal bar (11), and the second vertical connecting section (32) is welded to the second component (4); one end of the first vertical connecting section (31) and one end of the second vertical connecting section (32) are connected to form a whole through an inclined connecting section (33); the bent steel bars (3) are evenly spaced along the circumferential direction of the pier (1); S4: building a steel cage (5) between the two first components (2), and welding the steel cage (5) to the two first components (2) and all the second components (4); S5: Build a formwork outside the steel cage (5) and pour concrete.

2. The method for reinforcing a damaged bridge pier according to claim 1, characterized in that: First welding strips (21) are evenly spaced around the circumference of the outer surface of the first component (2), and the first welding strips (21) are arranged in a one-to-one correspondence with the new longitudinal bars (51) of the steel cage (5).

3. The method for reinforcing a damaged bridge pier according to claim 2, characterized in that: A support plate (22) is provided at the bottom of the first welding strip (21).

4. The method for reinforcing a damaged bridge pier according to claim 1, characterized in that: The first component (2) is composed of two semi-circular first sub-components (23), and first connecting plates (24) are respectively provided at both ends of the first sub-component (23).

5. The method for reinforcing a damaged bridge pier according to claim 1, characterized in that: The bent steel bar (3) has two first vertical connecting sections (31), and the two first vertical connecting sections (31) are respectively located on the upper and lower sides of the second vertical connecting section (32).

6. The method for reinforcing a damaged bridge pier according to claim 5, characterized in that: The included angle between the first vertical connecting section (31) and the inclined connecting section (33) is 100 to 140 degrees.

7. The method for reinforcing a damaged bridge pier according to claim 1, characterized in that: In step S2, longitudinal reinforcement exposed sections (12) may also be chiseled out at even intervals along the section to be reinforced of the pier (1).

8. The method for reinforcing a damaged bridge pier according to claim 1, characterized in that: Second welding strips (41) are evenly spaced around the circumference of the outer surface of the second component (4), and the second welding strips (41) are arranged in a one-to-one correspondence with the new longitudinal bars (51) of the steel cage (5).

9. The method for reinforcing a damaged bridge pier according to claim 1, characterized in that: The second component (4) is composed of two semi-circular second sub-components (42), and second connecting plates (43) are respectively provided at both ends of the second sub-component (42).

10. The method for reinforcing a damaged bridge pier according to claim 1, characterized in that: A hollow hole (25) is provided at the bottom of the first component (2).

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