A method for reinforcing and repairing the longitudinal reinforcement bars inside bridge piers after inertial fall due to earthquake damage.

Abstract

This invention discloses a method for reinforcing and repairing the longitudinal reinforcement inside a bridge pier after inertial fall due to earthquake damage. Vertical reinforcement devices are evenly distributed around the outer wall of the pier. Each reinforcement device includes an mounting block, a reinforcing steel plate component, a limit switch assembly, a support assembly, and a snap-fit ​​assembly. The mounting block is pre-embedded in the middle of the pier, and the reinforcing steel plate component can slide up and down relative to the mounting block. The bottom of the support assembly is anchored to the ground, and the bottom of the limit switch assembly is installed through the support assembly, while the top is fixed to a pre-embedded part on the pier. The snap-fit ​​assembly is arranged directly below the reinforcing steel plate component, with its bottom anchored to the ground. Under normal circumstances, the lower end of the reinforcing steel plate component is supported by the limit switch assembly. When the pier bends after earthquake damage to the longitudinal reinforcement inside the pier, the structure supporting the reinforcing steel plate component automatically opens, allowing the reinforcing steel plate component to fall. The top is snapped in place by the mounting block, and the bottom is snapped in place by the snap-fit ​​assembly, thus reinforcing the pier's bending resistance and achieving self-repair of the pier.

Description

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 inertial fall due to earthquake damage. 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 due to inertial fall, which can overcome the above-mentioned defects.

[0008] The present invention provides a method for reinforcing and repairing the internal longitudinal reinforcement of a bridge pier after inertial fall due to earthquake damage. The method employs the following technical solution: vertical reinforcement devices are evenly distributed around the outer wall of the bridge pier; each reinforcement device includes an installation block, a reinforcing steel plate component, a limit switch assembly, a support assembly, and a snap-fit ​​assembly; the installation block is pre-embedded in the middle of the bridge pier, and the reinforcing steel plate component can slide up and down relative to the installation block; the bottom of the support assembly is anchored to the ground, the bottom of the limit switch assembly is installed through the support assembly, and the top is fixed to the pre-embedded part of the bridge pier; the snap-fit ​​assembly is arranged directly below the reinforcing steel plate component, and the bottom is anchored to the ground; under normal circumstances, the lower end of the reinforcing steel plate component is supported by the limit switch assembly. When the bridge pier bends after earthquake damage to the internal longitudinal reinforcement and the bending reaches the design value, the structure supporting the reinforcing steel plate component automatically opens, the reinforcing steel plate component falls, and the top is snapped by the installation block, while the bottom is snapped by the snap-fit ​​assembly, thus reinforcing the bridge pier's bending resistance and achieving self-repair of the bridge pier.

[0009] When the above method is implemented, the reinforcing steel plate component includes a vertical plate body and snap joints on the outer sides of its two ends.

[0010] When the above method is implemented, the mounting block is provided with upper and lower through holes whose planar dimensions are larger than the cross-sectional dimensions of the vertical plate.

[0011] When the above method is implemented, the limit switch assembly includes two parts symmetrically arranged on the left and right sides of the reinforcing steel plate component. Each part includes a horizontal support plate, an iron chain, and a sleeve. The sleeve includes a vertical section and a horizontal straight section vertically connected to its lower end, and a horizontal L-shaped section vertically connected to its upper end. The vertical section and the lower end of the iron chain are connected to the middle position outside the horizontal support plate in the length direction and then pass through the sleeve. The upper end extends out of the sleeve and is fixed to the embedded part on the top of the pier.

[0012] When the above method is implemented, the support assembly includes a sleeve support rod and a support member of the horizontal support plate. The upper end of the sleeve support rod is fixed to the lower side of the horizontal L-shaped section, and the bottom is pre-embedded in the ground. The support member includes a support rod with a horizontally open U-shaped body and its lower wing plate vertically connected. The bottom of the support rod is pre-embedded in the ground.

[0013] When the above method is implemented, the middle part of the horizontal support plate is placed in the groove of the U-shaped body, and the lower end of the reinforcing steel plate component is supported by the two horizontal support plates.

[0014] When the above method is implemented, the buckle assembly includes an inverted U-shaped body, a buckle block, a spring, a pin, and a pin mounting block. The pin mounting blocks are symmetrically connected to both sides of the inverted U-shaped body. The buckle block is an eccentric T-shaped block, with the longer section of its wing plate inserted into the slot of the inverted U-shaped body and between the two pin mounting blocks. It can be rotatably installed by the pin. A pair of springs are installed on the lower side of this section of the wing plate. The outer side of the web of the buckle block is located between the slots of the inverted U-shaped body. The inner top side of the web plate and the bottom surface of the shorter section of the wing plate form a buckling structure for the lower end of the reinforcing steel plate component buckle joint.

[0015] This invention is vertically arranged around the pier, 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 chain of the switch limit component pulls the horizontal support plate outward, causing the reinforcing steel plate component to fall between the two horizontal support plates. When the lower end of the reinforcing steel plate component abuts against the inner side of the extended wing plate of the locking block, the locking block rotates around the pin, compressing the spring. When the locking block rotates until the lower end of the reinforcing steel plate component disengages from the locking block wing plate, the spring resets, causing the locking block to return to its original position. This locks the locking joint at the lower end of the reinforcing steel plate component with the locking block, thus locking both ends of the reinforcing steel plate component in place, providing bending-resistant reinforcement and self-repair for the pier. Attached Figure Description

[0016] Figure 1This is a front view schematic diagram of an embodiment of the present invention.

[0017] Figure 2 This is a top view of this embodiment.

[0018] Figure 3 This is an isometric schematic diagram of this embodiment.

[0019] Figure 4 This is an enlarged schematic diagram of a set of reinforcement devices in this embodiment.

[0020] Figure 5 for Figure 4 Enlarged schematic diagram of part A in the diagram.

[0021] Figure 6 This is an isometric enlarged view of the snap-fit ​​assembly. Detailed Implementation

[0022] Combination Figures 1 to 6 It can be seen that:

[0023] The method disclosed in this embodiment for reinforcing and repairing the longitudinal reinforcement inside a bridge pier after inertial fall due to earthquake damage involves evenly distributing reinforcement devices around the perimeter of the bridge pier 6. Each reinforcement device includes a reinforcing steel plate component 1, a mounting block 2, a limit switch assembly 3, a support assembly 4, and a snap-fit ​​assembly 5.

[0024] The reinforcing steel plate component 1 includes a vertical plate 11 and snap-fit ​​joints on the outer sides of its two ends.

[0025] Mounting block 2 is a rectangular block, and vertical plate 11 can slide up and down through the mounting block.

[0026] The limit switch assembly 3 has a symmetrical structure, with one side including a horizontal support plate 31, an iron chain 32, and a sleeve 33.

[0027] The sleeve 33 includes a vertical section and a horizontal straight section vertically connected to its lower end, and a horizontal L-shaped section vertically connected to its upper end. The lower end of the chain 32 is connected to the middle position of the outer side of the horizontal support plate 31 in the length direction and then passes through the sleeve 33, with the upper end extending out of the sleeve.

[0028] The support assembly 4 includes a sleeve support rod 41 and a horizontal support plate. The upper end of the sleeve support rod 41 is fixed to the lower side of the horizontal L-shaped section. The support member includes a horizontally open U-shaped body 42 and a support rod 43 vertically connected to its lower wing plate.

[0029] The snap-fit ​​assembly 5 includes an inverted U-shaped body 51, a snap-fit ​​block 52, a spring 53, a pin 54, and a pin mounting block 55. The pin mounting blocks 55 are symmetrically connected to both sides of the inverted U-shaped body 51. The snap-fit ​​block 52 is an eccentric T-shaped block, and the longer section of its wing plate is inserted into the slot of the inverted U-shaped body 51 and between the two pin mounting blocks 55. It can be rotatably installed by the pin 54. A pair of springs 53 are installed on the lower side of this section of the wing plate.

[0030] The specific number of reinforcement devices installed around the bridge pier is determined based on the diameter of the bridge pier.

[0031] The structural components of the reinforcement device are prefabricated in the factory, as detailed below:

[0032] The reinforcing steel plate component 1 is manufactured in conjunction with the mounting block to ensure that the vertical plate 11 of the reinforcing steel plate component can slide flexibly in the mounting holes on the mounting block 2, and the snap joint at the upper end of the vertical plate is not welded to the vertical plate.

[0033] After the sleeve sections of the limit switch assembly are welded together, the chain is passed through the sleeve. The lengths of the chain at both ends outside the sleeve are determined. A hook for fixing the chain is welded to the middle of one side edge of the horizontal support plate along its length, and one end of the chain is fixed to the hook. After the upper end of the chain passes through the sleeve, a radial bolt is inserted to limit the chain movement.

[0034] The upper end of the sleeve support rod 41 of the support component 4 is welded and fixed to the sleeve 33 to ensure the verticality of the sleeve support rod.

[0035] The upper end of the support rod 43 of the horizontal support plate is welded and fixed to the U-shaped body 42.

[0036] All structural components of the buckle assembly 5 are assembled to ensure that the buckle block 52 can rotate flexibly around the pin shaft 54.

[0037] The structural components of the reinforcement device were transported to the construction site for installation.

[0038] During the prefabrication of the bridge piers, a corresponding number of installation blocks 2 and hooks for fixing the upper end of the iron chain are pre-embedded according to the design location. The positions of the hooks are symmetrical about the installation blocks, and the specific positions need to be determined according to the sleeve position of the switch limit assembly.

[0039] When installing the reinforcement device, first install the support component 4 according to the position of the mounting block 2, anchor the lower ends of the support rod 43 and the sleeve support rod 41 to the ground to ensure their verticality and the spacing between the two support rods, and fix the upper end of the iron chain 32 to the hook pre-embedded on the top of the pier.

[0040] Next, install the reinforcing steel plate component 1, weld and fix the clamping joint at the upper end of the vertical plate 11, and support the clamping joint at the lower end of the vertical plate on the horizontal support plate 31.

[0041] Finally, install the snap-fit ​​assembly 5. In order to ensure the snap-fit ​​assembly is installed in the correct position, the reinforcing steel plate component is lowered so that the snap-fit ​​connector at the lower end of the vertical plate 11 can engage with the snap-fit ​​block 52 of the snap-fit ​​assembly. Then, anchor the bottom of the inverted U-shaped body 51 and the pin mounting block 55 of the snap-fit ​​assembly to the ground.

[0042] After the snap-fit ​​assembly is installed, the reinforcing steel plate component 1 returns to the state supported by the horizontal support plate 31. Under normal conditions and minor earthquakes, the internal longitudinal reinforcement of the pier 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 chain of the switch limit assembly pulls the horizontal support plate outward, causing the reinforcing steel plate component to fall between the two horizontal support plates. When the lower end of the reinforcing steel plate component abuts against the inner side of the extended wing plate of the snap-fit ​​block, the snap-fit ​​block rotates around the pin, compressing the spring. When the snap-fit ​​block rotates until the lower end of the reinforcing steel plate component disengages from the snap-fit ​​block wing plate, the spring resets, causing the snap-fit ​​block to reset, thus locking the snap-fit ​​connector at the lower end of the reinforcing steel plate component with the snap-fit ​​block. At this point, both ends of the reinforcing steel plate component are locked and positioned, providing bending-resistant reinforcement and self-repair for the pier.

Claims

1. A method for reinforcing and repairing the longitudinal reinforcement bars inside bridge piers after inertial fall due to earthquake damage, characterized in that: This method involves evenly distributing vertical reinforcement devices around the outer wall of the bridge pier. Each reinforcement device includes a mounting block, a reinforcing steel plate component, a limit switch assembly, a support assembly, and a snap-fit ​​assembly; The reinforcing steel plate component includes a vertical plate and snap-fit ​​joints on both outer sides of its ends; The mounting block is embedded in the middle of the pier, and the reinforcing steel plate component can slide up and down relative to the mounting block; The limit switch assembly includes two parts symmetrically arranged on the left and right sides of the reinforcing steel plate component. Each part includes a horizontal support plate, a chain, and a sleeve. The sleeve includes a vertical section and a horizontal straight section vertically connected to its lower end, and a horizontal L-shaped section vertically connected to its upper end. The vertical section is connected to the lower end of the chain at the middle position outside the horizontal support plate in the length direction and then passes through the sleeve. The upper end extends out of the sleeve and is fixed to the embedded part on the top of the pier. The bottom of the support assembly is embedded in the ground, the bottom of the limit switch assembly is installed through the support assembly, and the top is fixed to the embedded part of the bridge pier; The buckle assembly includes an inverted U-shaped body, a locking block, a spring, a pin, and a pin mounting block. The pin mounting blocks are symmetrically connected to both sides of the inverted U-shaped body. The locking block is an eccentric T-shaped block, with the longer section of its wing plate inserted into the slot of the inverted U-shaped body and between the two pin mounting blocks. It can be rotatably installed by the pin. A pair of springs are installed on the lower side of the wing plate. The outer side of the web of the locking block is located between the slots of the inverted U-shaped body. The inner top side of the web plate and the bottom surface of the shorter section of the wing plate form a locking structure for the lower end locking joint of the reinforcing steel plate component. The snap-fit ​​assembly is positioned directly below the reinforcing steel plate component, with its bottom embedded in the ground. Under normal circumstances, the lower end of the reinforcing steel plate component is supported by the limit switch assembly. When the pier bends after the earthquake damages the internal longitudinal reinforcement and the bending reaches the design value, the structure supporting the reinforcing steel plate component automatically opens, and the reinforcing steel plate component falls. The top is locked by the installation block, and the bottom is locked by the buckle assembly to reinforce the pier against bending and achieve self-repair of the pier.

2. The method for reinforcing and repairing the longitudinal reinforcement inside the bridge pier after earthquake damage and inertial fall as described in claim 1, wherein the mounting block is provided with upper and lower through holes with a planar dimension larger than the cross-sectional dimension of the vertical plate.

3. The method for reinforcing and repairing the longitudinal reinforcement inside the bridge pier after inertial fall due to earthquake damage as described in claim 1, wherein the support assembly includes a sleeve support rod and a support member of the horizontal support plate, the upper end of the sleeve support rod is fixed to the lower side of the horizontal L-shaped section, and the bottom is pre-embedded in the ground, and the support member includes a support rod with a horizontally open U-shaped body and its lower wing plate vertically connected, and the bottom of the support rod is pre-embedded in the ground.

4. The method for reinforcing and repairing the longitudinal reinforcement inside the bridge pier after earthquake damage due to inertial fall, as described in claim 3, wherein the middle part of the horizontal support plate is placed in the groove of the U-shaped body, and the lower end of the reinforcing steel plate component is supported by two horizontal support plates.

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