A method for repairing a bridge pier by pulling up and reinforcing the longitudinal reinforcement after earthquake damage
By arranging reinforcement devices on the outer wall of the bridge pier and using iron chains and fasteners to autonomously position and reinforce the steel plate components during an earthquake, the problems of longitudinal reinforcement yielding and post-earthquake repair of the bridge pier were solved, achieving rapid self-repair and seismic enhancement.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- CENT SOUTH UNIV
- Filing Date
- 2023-12-21
- Publication Date
- 2026-05-01
AI Technical Summary
The existing bridge piers suffered severe yielding and damage to their longitudinal reinforcement during the earthquake, resulting in insufficient ductility. Post-earthquake repair procedures are complicated and it is difficult to quickly restore their seismic resistance.
A reinforcement device is arranged along the axial direction of the outer wall of the bridge pier, including a reinforcement steel plate component, a mounting block, an upper clip assembly, a lower clip assembly, an iron chain, and a support assembly. When the longitudinal reinforcement is bent and deformed by an earthquake, the iron chain pulls the reinforcement steel plate component to position it, thereby achieving a self-healing bending resistance function.
After the longitudinal reinforcement of the bridge pier is damaged, a reinforcement device can be used to achieve rapid self-repair, enhance the seismic resistance of the bridge pier, avoid over-reinforcement, and simplify the post-earthquake repair process.
Smart Images
Figure CN117513190B_ABST
Abstract
Description
A method for reinforcing and repairing the longitudinal reinforcement inside bridge piers after earthquake damage by upward tension constraint. Technical Field
[0001] This invention belongs to the field of bridge seismic resistance, specifically a method for reinforcing and repairing the longitudinal reinforcement inside bridge piers after earthquake damage by upward tension constraint. Background Technology
[0002] High-speed railway bridges play a crucial role in the entire high-speed railway system, therefore preventing damage to high-speed railway bridges is of great significance.
[0003] In past earthquakes, the damage to bridge piers has mainly been concentrated in the spalling of the protective concrete layer in the bottom plastic hinge zone, crushing of the core concrete, and yielding failure of the longitudinal reinforcement. Bridge piers play a crucial role in supporting the main beams and track structures, and transferring seismic loads from the superstructure to the foundation. Therefore, bridge piers are an indispensable and critical component of bridge structures. However, most existing traditional bridge piers have the following shortcomings:
[0004] 1. Controlling the longitudinal reinforcement ratio to ensure the ductility of the bridge piers resulted in insufficient longitudinal reinforcement in the piers during major earthquakes, leading to yielding and failure of the longitudinal reinforcement.
[0005] 2. The residual displacement of bridge piers caused by earthquakes is difficult to control.
[0006] 3. The post-earthquake repair process for bridge piers is complex, and it is difficult to guarantee that repairs can be completed quickly after damage to withstand the next earthquake. Summary of the Invention
[0007] The purpose of this invention is to provide a method for reinforcing and repairing the longitudinal reinforcement inside bridge piers after earthquake damage by overcoming the above-mentioned defects through upward tension constraint.
[0008] The present invention provides a method for reinforcing and repairing the longitudinal reinforcement of bridge piers damaged by earthquakes by upward tension constraint. The method employs the following technical solution: Reinforcing devices are evenly distributed along the outer wall of the bridge pier. Each reinforcing device includes a reinforcing steel plate component, a mounting block, an upper clamping assembly, a lower clamping assembly, a chain, and a support assembly. One side of the mounting block is pre-embedded in the upper part of the bridge pier. The reinforcing steel plate component can slide up and down relative to the mounting block and can also be locked at its initial position by the mounting block. One side of the upper clamping assembly is pre-embedded inside the bridge pier and can achieve the upper limit of the reinforcing steel plate component after sliding upward relative to the mounting block through horizontal expansion and contraction. The lower clamping assembly is arranged below the reinforcing steel plate component, with its bottom pre-embedded... On the ground, the top can achieve the lower limit position when the reinforcing steel plate component slides upward relative to the mounting block; the lower end of the iron chain is fixed to the upper end of the reinforcing steel plate component, and the upper end of the iron chain is fixed to the embedded part of the pier; the bottom of the support component is embedded in the ground, and the top supports the iron chain; under normal circumstances, the iron chain does not work, the lower buckle component does not work, and the top of the reinforcing steel plate component is positioned by the mounting block and the upper buckle component; when the pier bends and reaches the design value after the longitudinal reinforcement inside the pier is damaged by an earthquake, the iron chain pulls the reinforcing steel plate component upward, the upper buckle component puts the upper limit position of the reinforcing steel plate component, and the lower buckle component puts the lower limit position of the reinforcing steel plate component, so as to perform self-repair of the pier's bending reinforcement.
[0009] When the above technical solution is implemented, the reinforcing steel plate component includes a vertical plate body and a hook joint connected to the top outer side and a fastener connected to the bottom outer side.
[0010] When the above technical solution is implemented, a rectangular groove along the width direction of the plate is provided on the inner top side of the vertical plate; the hook joint is an inverted C-shaped structure, with the top folded edge serving as the hook edge and the bottom folded edge connected and fixed to the outer side of the vertical plate; the fastener is a rectangular block with a concave arc edge at the bottom.
[0011] When the above technical solution is implemented, the mounting block is a rectangular block with a vertical through hole, and vertical stops are symmetrically fixed at both ends of the inner side of the through hole.
[0012] When the above technical solution is implemented, the top of the vertical plate is inserted into the through hole of the mounting block during assembly, and the top folded edge of the hook joint serves as the hooking edge of the lower limit of the top of the vertical plate.
[0013] When the above technical solution is implemented, the upper buckle assembly includes a buckle block and a spring. The buckle block is a rectangular block, which is horizontally arranged between the vertical stops of the mounting block and can slide along the vertical stops. The thickness of the buckle block matches the rectangular groove on the vertical plate. The spring is horizontally connected to the inner side of the buckle block. When the spring is in a free state, the outer side of the buckle block crosses the inner edge of the through hole.
[0014] When the above technical solution is implemented, the lower buckle assembly includes a support member, a buckle member and a spring. The buckle member is disposed in a rectangular cavity inside the support member. Its inner side edge is flush with the inner side edge of the top of the support member, and its outer side is rotatably hinged to the support member. The upper end of the compression spring is fixed to the top surface of the rectangular cavity, and the lower end is fixed to the top surface of the buckle member.
[0015] When the above technical solution is implemented, the buckling component is an inverted eccentric T-shaped body, the inner length of its wing plate is less than the outer length, and the outer length of the wing plate is hinged to the support component through a pin.
[0016] When the above technical solution is implemented, the distance between the top of the support member and the vertical plate is greater than the thickness of the vertical plate. When the wing plate of the buckle member is in a horizontal state, the outer edge of the buckle joint overlaps with the inner side of the wing plate of the buckle member.
[0017] When the above technical solution is implemented, the support component includes a ground support rod and an iron chain sleeve, with the upper end of the ground support rod supported on the lower side of the iron chain sleeve.
[0018] This invention provides a uniformly distributed reinforcing device along the axial direction of the outer wall of the bridge pier, arranged in the same direction as the longitudinal reinforcement inside the pier. Under normal conditions and minor earthquakes, the internal longitudinal reinforcement ensures the normal function of the pier, avoiding over-reinforcement caused by directly adding steel bars inside the pier. Under higher-level earthquakes, when the internal longitudinal reinforcement of the pier fails, the pier will undergo bending deformation. When the bending reaches the design value, the iron chain fixed to the pier pulls the reinforcing steel plate component upward. The top of the reinforcing steel plate component is positioned by an upper clamping assembly fixed to the pier, and the bottom is positioned by a lower clamping assembly fixed to the ground. The reinforcing steel plate component provides bending reinforcement and repair to the pier. Attached Figure Description
[0019] Figure 1 is a schematic diagram of the overall layout of an embodiment of the present invention.
[0020] Figure 2 is a schematic diagram of the assembly of a single reinforcement device with a bridge pier in this embodiment.
[0021] Figure 3 is a side view of the reinforcement device in Figure 2.
[0022] Figure 4 is an enlarged structural schematic diagram of the reinforcing steel plate component in the reinforcing device.
[0023] Figure 5 is an enlarged schematic diagram of part A in Figure 2.
[0024] Figure 6 is an enlarged schematic diagram of part B in Figure 2. Detailed Implementation
[0025] As shown in Figure 1, the method for reinforcing and repairing the longitudinal reinforcement inside the bridge pier after earthquake damage disclosed in this embodiment involves uniformly distributing reinforcement devices along the axial direction of the outer wall of the bridge pier.
[0026] As shown in Figure 2, the reinforcement device includes a reinforcing steel plate component 1, a mounting block 2, an upper buckle assembly 3, a lower buckle assembly 4, an iron chain 5, and a support assembly 6.
[0027] As can be seen from Figures 2 to 6:
[0028] The mounting block 2 is arranged horizontally, with its inner side pre-embedded in the upper part of the pier. The protruding part is provided with a through hole for installing the reinforcing steel plate component 1, and vertical stop blocks 21 are symmetrically welded to the inner ends of the corresponding through holes.
[0029] That is, the installation block 2 is pre-positioned and embedded during the prefabrication of the bridge pier.
[0030] Combining Figures 3 and 4, we can see that:
[0031] The reinforcing steel plate component 1 includes a vertical plate 11 and a hook joint 12 connected to the outer top and a fastener 13 connected to the outer bottom.
[0032] A rectangular groove 111 along the width direction of the plate is provided on the inner top side of the vertical plate 11.
[0033] The hook joint 12 has an inverted C-shaped structure, with the top folded edge serving as the hook edge and the bottom folded edge connected and fixed to the outer side of the vertical plate 11.
[0034] The fastener 13 is a rectangular block with a concave arc-shaped bottom edge.
[0035] When the reinforcing steel plate component 1 is fabricated, the hanger 12 is not welded to the vertical plate 11.
[0036] The upper snap-fit assembly 3 includes a snap-fit block 31 and a spring 32. The snap-fit block 31 is a rectangular block, horizontally arranged between the vertical stops 21 of the mounting block 2. The vertical stops 21 serve as guide structures for the sliding of the snap-fit block 31. That is, when manufacturing the upper snap-fit assembly, special attention should be paid to matching the spacing between the snap-fit block 31 and the vertical stops on the mounting block.
[0037] The thickness of the locking block 31 matches the rectangular groove 111 on the vertical plate 11. The spring 32 is horizontally connected to the inner side of the locking block 31. When the spring 32 is in a free state, the outer side of the locking block 31 passes over the inner edge of the through hole of the mounting block 2.
[0038] When manufacturing the latching block 31 of the upper latching component 3, it needs to be pre-assembled with the vertical stop block 21 on the mounting block 2 to ensure that the latching block 31 can slide smoothly between the vertical stop blocks 21.
[0039] When determining the length of the spring 32, the upper buckle assembly 3 needs to ensure that the outer side of the buckle block 31 extends beyond the inner side of the through hole on the mounting block 2.
[0040] The spring 32 of the upper buckle assembly 3 also needs to be positioned and embedded during the prefabrication of the bridge pier. Therefore, the mounting block 2 and the upper buckle assembly 3 need to be made and embedded during the prefabrication of the bridge pier.
[0041] The lower latching assembly 4 includes a support member 41, a latching member 42, and a spring 43.
[0042] The support member 41 includes a support block 411 with a rectangular groove, the top edge of the support block extending beyond the bottom edge, and an inverted L-shaped groove for installing a snap fastener and a spring. It also includes vertical blocks 412 symmetrically arranged on both sides of the bottom edge of the support block.
[0043] The snap-fit component 42 is an inverted eccentric T-shaped body, with the inner length of its wing plate being less than the outer length. The outer length of the wing plate is hinged to the vertical block 412 of the support component 41 via a pin.
[0044] The inner bottom surface of the snap fastener 42 is supported by the inverted L-shaped groove and the boss of the support block 411, and the outer side is held in place by the spring 43 to maintain its initial horizontal state.
[0045] The support assembly 6 includes a ground support rod 61 and a chain sleeve 62, with the upper end of the ground support rod 61 supported on the lower side of the chain sleeve 62.
[0046] The reinforcing steel plate component 1, the lower buckle assembly 4, the iron chain 5, and the support assembly 6 are manufactured in the factory and then transported to the site for installation.
[0047] The specific assembly process is as follows:
[0048] 1. Install reinforcing steel plate components 1
[0049] The top of the vertical plate 11 is inserted into the through hole on the mounting block 2, and the top edge of the hook connector 12 is hung on the outer upper surface of the mounting block 2.
[0050] 2. Install the lower clip assembly 4
[0051] The top of the support block 411 of the support member 41 is located on the outside of the vertical plate 11. The small gap ensures that the vertical plate 11 can move up and down, while ensuring that the fastening joint 13 at the bottom of the vertical plate 11 overlaps with the bottom surface of the fastening member 42. Pulling the vertical plate 11 can make the fastening member 42 rotate around the hinge pin between it and the vertical block 412, so that the top surface of the fastening joint 13 is fastened to the bottom surface of the top edge of the support block.
[0052] 3. Install support components chain 5 and support components 6.
[0053] The iron chain 5 is passed through the iron chain sleeve 62 of the support component 6. The lower end of the iron chain 5 is connected and fixed to the hook 12, and the upper end is fixed to the hook pre-embedded on the top of the pier. The top of the ground support rod 61 of the support component 6 supports the iron chain sleeve 62, and the bottom is fixed to the ground.
[0054] The initial state after on-site installation is as follows:
[0055] The top of the reinforcing steel plate component 1 has a hook joint 12 that is lowered by the mounting block 2, and the top surface of the bottom fastener 13 of the reinforcing steel plate component 1 contacts the bottom surface of the fastener component 42 of the lower fastener assembly 4. The bottom surface of the fastener component 42 is kept horizontal under the action of the spring 43, and the spring 32 of the upper fastener assembly is compressed, causing the locking block 31 to press against the vertical plate 11. The chain 5 is not under force.
[0056] The working principle of the reinforcement device is as follows:
[0057] Under normal circumstances, the iron chain 5 does not function, the lower buckle assembly 4 does not function, and the top of the reinforcing steel plate component 1 is positioned by the mounting block 2 and the upper buckle assembly 3.
[0058] When an earthquake damages the longitudinal reinforcement inside the pier, causing bending failure and reaching the design value, the chain 5 pulls the reinforcing steel plate component 1 upwards. When the rectangular groove 111 at the top of the vertical plate 11 rises to the position of the corresponding latching block 31 of the upper latching component 3, the latching block 31, under the reset action of the spring 32, inserts into the rectangular groove, limiting the top of the vertical plate. Simultaneously, as the vertical plate 11 rises, the bottom fastener 13 causes the latching component 42 of the lower latching component 4 to rotate outwards until the fastener 13 disengages from the latching component 42 and engages with the bottom surface of the top of the support block 411. At this point, both the top and bottom of the reinforcing steel plate component are positioned for self-repair of the pier's bending reinforcement. The latching component returns to a horizontal state under the reset action of the spring 43.
Claims
1. A method for reinforcing and repairing the longitudinal reinforcement inside a bridge pier after earthquake damage by upward tension constraint, characterized in that: The method involves evenly distributing reinforcing devices along the axial direction of the outer wall of the bridge pier. Each reinforcing device includes a reinforcing steel plate component, a mounting block, an upper snap-fit assembly, a lower snap-fit assembly, a chain, and a support assembly. The reinforcing steel plate component includes a vertical plate body and a hook joint connected to its top outer side and a snap joint connected to its bottom outer side. A rectangular groove along the width direction of the plate body is provided on the inner side of the top of the vertical plate body. The hook joint has an inverted C-shaped structure, with the top folded edge serving as the hook edge and the bottom folded edge connected and fixed to the outer side of the vertical plate body. The snap joint is a rectangular block with a concave arc-shaped edge at the bottom. The mounting block is a rectangular block with a vertical through hole, and vertical stops are symmetrically fixed at both ends of the inner side corresponding to the through hole. One side of the mounting block is pre-... The vertical plate, embedded in the upper part of the pier, is inserted into the through hole of the mounting block at its top during assembly. The top folded edge of the hook joint serves as the hook edge for the lower limit of the top of the vertical plate, allowing the reinforcing steel plate component to slide up and down relative to the mounting block and also to be stopped by the initial state of the mounting block. The upper snap-fit assembly includes a snap-fit block and a spring. The snap-fit block is a rectangular block, horizontally arranged between the vertical stops of the mounting block, and can slide along the vertical stops. The thickness of the snap-fit block matches the rectangular groove on the vertical plate. The spring is horizontally connected to the inner side of the snap-fit block. When the spring is in a free state, the outer side of the snap-fit block crosses the inner edge of the through hole. One side of the upper snap-fit assembly is pre-embedded in the pier and extends horizontally. To achieve the upper limit position after the top of the reinforcing steel plate component slides upward relative to the mounting block; the lower latching assembly includes a support component, a latching component, and a spring. The latching component is disposed in a rectangular cavity inside the support component, with its inner side edge flush with the inner side edge of the top of the support component, and its outer side hinged to the support component. The upper end of the compression spring is fixed to the top surface of the rectangular cavity, and its lower end is fixed to the top surface of the latching component. The latching component is an inverted eccentric T-shaped body, with the inner length of its wing plate being less than the outer length. The outer side of the wing plate is hinged to the support component via a pin. When the wing plate of the latching component is in a horizontal state, the outer edge of the latching joint overlaps with the inner side of the wing plate of the latching component. The lower latching assembly is arranged on the reinforcing steel plate. The bottom of the component is embedded in the ground, and the top can realize the lower limit position when the reinforcing steel plate component slides upward relative to the mounting block; the lower end of the iron chain is fixed to the upper end of the reinforcing steel plate component, and the upper end of the iron chain is fixed to the embedded part of the pier; the bottom of the support component is embedded in the ground, and the top supports the iron chain; under normal circumstances, the iron chain does not work, the lower buckle component does not work, and the top of the reinforcing steel plate component is positioned by the mounting block and the upper buckle component; when the pier bends and reaches the design value after the longitudinal reinforcement inside the pier is damaged by an earthquake, the iron chain pulls the reinforcing steel plate component upward, the upper buckle component puts the upper limit position of the reinforcing steel plate component, and the lower buckle component puts the lower limit position of the reinforcing steel plate component, so as to perform self-repair of the pier's bending reinforcement.
2. The method for reinforcing and repairing the longitudinal reinforcement inside bridge piers after earthquake damage, as described in claim 1, is characterized in that: The distance between the top of the supporting member and the vertical plate is greater than the thickness of the vertical plate.
3. The method for reinforcing and repairing the longitudinal reinforcement inside bridge piers after earthquake damage, as described in claim 1, is characterized in that: The support assembly includes a ground support rod and a chain sleeve, with the upper end of the ground support rod supported on the lower side of the chain sleeve.
Citation Information
Patent Citations
Main beam anti-falling beam and energy dissipation device with multiple protection functions and manufacturing method thereof
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Novel prefabricated assembled pier
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