Pier reinforcing device and construction method thereof

Abstract

The invention relates to the technical field of pier reinforcing engineering, in particular to a pier reinforcing device and a construction method thereof. The device comprises an annular strap, a fastening screw rod and a strap shell which are all made of high-strength steel, one end of the strap and the strap shell are integrally formed, the other end of the strap is a free end, the strap and the strap shell are each provided with a threaded structure matched with the fastening screw rod, and circumferential tightening of the strap is achieved. During construction, pier outer wall treatment and rubber protection layer laying are completed firstly, then the device surrounds and wraps the device, fastening assemblies are assembled, the target prestress is determined based on quantitative calculation, the prestress is applied in a'pre-tightening-re-tightening-final screwing 'grading mode, finally protection closing and acceptance check are conducted, and multiple devices can be arranged in the height direction of the pier. The method does not need to be customized according to the perimeter of the bridge pier, adapts to various section types of bridge piers, is convenient to construct, does not affect under-bridge passing, can remarkably improve the axial bearing capacity of the bridge pier, guarantees the structural safety and durability, and is suitable for reinforcing and transforming various concrete bridge piers.

Description

Technical Field

[0001] This invention relates to the field of bridge pier reinforcement engineering technology, specifically to a bridge pier reinforcement device and its construction method that are applicable to various types of bridge piers, have controllable reinforcement effects, and are easy to construct. Background Technology

[0002] Bridges, as a key component of transportation infrastructure, bear the burden of a large number of vehicles and pedestrians, and bridge piers are the core components supporting the bridge structure. In existing bridges, due to factors such as imperfect early design specifications, construction defects, structural damage and aging caused by long-term operation, and changes in usage functions, bridge piers are prone to defects such as surface spalling, concrete cracking, and reinforcement corrosion. This leads to problems such as insufficient bridge load-bearing capacity and reduced seismic performance, seriously affecting the safe operation and service life of the bridge. Therefore, it is urgent to effectively reinforce and renovate the damaged bridge piers.

[0003] Currently, various bridge pier reinforcement technologies have been developed both domestically and internationally, including cross-section enlargement reinforcement, embedded reinforcement, external tensile reinforcement, steel sleeve reinforcement, FRP reinforcement, wire wrapping reinforcement, and "dog-bone" reinforcement for longitudinal reinforcement repair. Cross-section enlargement reinforcement improves stability by increasing the cross-sectional area of ​​the component and adding reinforcement, but it has a long construction period and significant impact on the surrounding environment. Embedded reinforcement relies on resin bonding materials, and its long-term durability is significantly affected by environmental factors. External tensile reinforcement can alleviate cracking problems at their source, but its system structure is complex and costly. Steel sleeve reinforcement increases the cross-sectional area and self-weight of the pier, impacting traffic under the bridge. FRP reinforcement has drawbacks such as insufficient shear strength and susceptibility to aging at high temperatures. Wire wrapping reinforcement has difficulty controlling the uniformity of its winding. "Dog-bone" reinforcement for longitudinal reinforcement repair is mainly applicable to specific defects caused by longitudinal reinforcement fracture, and its scope of application is relatively narrow.

[0004] Existing related patents also have many shortcomings. For example, the bridge pier reinforcement device disclosed in Chinese patent CN110468745A requires prefabrication of components based on actual bridge piers, which generally has poor adaptability. Chinese patent CN102108680B adopts a reinforcement method that combines composite material sleeves with epoxy mortar. Although it has high strength and long service life, it also increases the cross-sectional area and self-weight of the bridge pier, affecting traffic and increasing construction costs. Summary of the Invention

[0005] The purpose of this invention is to provide a bridge pier reinforcement device and its construction method, which solves the problems of poor adaptability, uncontrollable reinforcement effect, complex construction or increased self-weight of bridge piers in existing reinforcement devices.

[0006] To achieve the above objectives, the technical solution of this application is: a bridge pier reinforcement device, comprising: The hoop has several threaded holes and is used to wrap around the outer circumference of the bridge pier to be reinforced. The fastening screw has threads machined on its shaft to match the threaded holes of the clamp. The hoop has a threaded groove inside that matches the thread of the fastening screw. The hoop and one end of the hoop are integrally formed, and the other end of the hoop is a free end that extends into the hoop. The hoop is tightened and secured by screwing the fastening screw into the threaded hole of the hoop.

[0007] In another implementation of the present invention, the effective thickness t of the hoop is much smaller than the radius R of the pier to be reinforced.

[0008] The present invention also provides a construction method for a bridge pier reinforcement device, comprising the following steps: Verify the damaged parts of the bridge piers, mark the installation elevation and circumferential positioning lines of the bridge pier reinforcement devices, erect temporary supports and set up protective measures, and check the construction equipment; Clean and polish the outer wall of the bridge pier, repair local defects, wrap and fix a rubber protective layer of the same width as the hoop; The bridge pier reinforcement device is wrapped around the outside of the rubber protective layer. The horizontality and fit of the hoop are adjusted so that the free end of the hoop passes through the hoop shell to form a closed loop. Pass the fastening screw through the hoop housing so that it engages with the threaded groove of the hoop housing and the threaded hole of the hoop band; Rotate the fastening screw and apply the target tension in a staged manner of "pre-tightening - re-tightening - final tightening". After the designed tension is reached, lock the fastening screw to prevent loosening and fix the excess hoop length. Remove oil and rust from the outer surface of the bridge pier reinforcement device and spray an epoxy adhesive layer.

[0009] In another implementation of the invention, the target tensile force is based on the target reinforcement strength. Sure: Where R is the radius of the pier (5) and b is the effective width of the hoop (3), For the Poisson's ratio of the concrete of the bridge pier (5), The circumferential uniformity coefficient is... The effective force transmission coefficient.

[0010] In another implementation of the present invention, the effective force transmission coefficient ,in The fit coefficient is 0.80 ≤ ≤1.00, The tensile loss coefficient is 0 ≤ ≤0.20.

[0011] In another implementation of the present invention, the circumferential uniformity coefficient , This is an empirical coefficient, 0.5 ≤ ≤2.0, is the circumferential strain dispersion coefficient of the hoop.

[0012] In another implementation of the present invention, the tension P is indirectly controlled by the tightening torque T of the fastening screw, and the relationship between torque and tension is as follows: , The empirical torque coefficient is 0.10 ≤ ≤0.30, This refers to the nominal diameter of the fastening screw.

[0013] In another implementation of the present invention, when n pier reinforcement devices are arranged along the pier height direction, the total axial bearing capacity increment is... ,in , The cross-sectional area of ​​the bridge pier. The mutual influence coefficient, , This is an empirical coefficient, 0.3 ≤ ≤1.5, where s is the net spacing between adjacent bridge pier reinforcement devices.

[0014] In another implementation of the invention, the actual equivalent confining compressive stress of the hoop on the outer wall of the pier ,and ≤ , For the effective force transmission coefficient, The local bearing capacity coefficient is 0.60 ≤ ≤1.00, This is the design value for the compressive strength of the concrete in the bridge pier.

[0015] In another implementation of the present invention, the tensile stress of the cross-section of the hoop must satisfy: in, The effective thickness of the hoop. The allowable tensile stress of the hoop material, For the safety factor, the value range is 1.10 ≤ ≤2.00.

[0016] By adopting the above technical solution, the present invention can achieve the following technical effects: The design of the ring-shaped band extending into the hoop shell at its free end eliminates the need for customization based on the pier's perimeter. The band can be adjusted to fit piers with different cross-sectional dimensions and perimeters by adjusting its winding length. Excess band length can be flexibly disposed of after tightening, significantly improving the applicability of the device and reducing customization costs.

[0017] The fastening screw is compatible with the threaded hole of the hoop and the threaded groove of the hoop shell. By turning the screw, the hoop is tightened step by step. Combined with the hoop's design of wrapping around the outer periphery of the bridge pier, it can apply uniform annular constraint pressure to the bridge pier, effectively avoiding local stress concentration and ensuring stable and reliable reinforcement effect.

[0018] 3. All components are made of high-strength steel, which significantly reduces the weight of the device while ensuring structural strength and will not increase the load on the piers. Furthermore, the reinforcement does not change the original cross-sectional dimensions of the piers and has no impact on the surrounding traffic space, making it suitable for bridge scenarios with high space requirements.

[0019] 4. The construction method is based on quantification, clearly defines key control indicators for construction, and does not rely on experience-based judgment. This can effectively avoid problems of insufficient or excessive reinforcement, ensure that the final reinforcement effect fully meets the design standards, and greatly improve the reliability of pier reinforcement.

[0020] 5. By using multi-dimensional parameters, we can ensure that the strength of the reinforcement device itself meets the requirements of construction and use, avoid damage caused by excessive force, and prevent secondary damage to the bridge pier due to excessive pressure, thus comprehensively ensuring the long-term safety of the construction process and the reinforced structure.

[0021] 6. Before construction, the reinforcement effect can be predicted through parameters. Combined with the actual load-bearing requirements of the bridge piers, key construction plans such as the density and location of the installation devices can be scientifically optimized. This avoids unnecessary material consumption and construction investment, and achieves rational resource allocation, reduces project costs, and balances safety and economy while ensuring reinforcement quality. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0023] Figure 1 A schematic diagram of the bridge pier reinforcement device; Figure 2 Schematic diagram of the bridge pier reinforcement device layout; Figure 3 Force dispersion diagram of the bridge pier to be reinforced; Figure 4Schematic diagram of the reinforcement principle of the bridge pier reinforcement device; Figure 5 A schematic diagram of the forces acting on the bridge pier reinforcement device; Figure 6 This is a diagram showing the distribution of the bridge pier reinforcement devices in the embodiment; The numbers in the diagram are explained as follows: 1. Hoop; 2. Fastening screw; 3. Hoop band; 4. Pier reinforcement device; 5. Pier; 6. Pier outer wall. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments of the present invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0026] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the accompanying drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0027] Example 1 like Figure 1-2As shown, this embodiment provides a bridge pier reinforcement device suitable for reinforcing bridge piers made of C30 concrete with a circular cross-section. It can effectively improve the axial bearing capacity of the bridge pier and meet the engineering reinforcement design requirements. Specifically, it includes an annular hoop 3, a fastening screw 2, and a hoop shell 1, all three of which are made of Q345 steel. This material has a tensile strength range of 470-630MPa, combining high strength with good structural stability, ensuring effective transfer of prestress during the reinforcement process and long-term resistance to external environmental effects.

[0028] Hoop 3: A long strip of high-strength steel component with continuous threaded holes along its length. The size of the threaded holes is compatible with the thread of the fastening screw 2. One end of the hoop 3 is integrally formed with the hoop shell 1, and the other end is a free end, which can be flexibly adjusted according to the circumference of the pier. In this embodiment, the effective width of the hoop 3 is b=1m and the effective thickness is t=0.02m. The effective thickness is much smaller than the radius of the pier to be reinforced, ensuring that the hoop can fit tightly against the outer circumference of the pier and uniformly transmit the constraint pressure.

[0029] Fastening screw 2: The screw body is machined with external threads that match the threaded hole of the band 3. The tightening and locking of the band is achieved through thread engagement. The nominal diameter of the screw is designed according to the target tensile force requirement to ensure that its strength can match the tensile force transmission during the tightening process of the band, and to avoid thread stripping or screw breakage.

[0030] Hoop 1: It is a hollow high-strength steel component. After being integrally formed with the annular hoop 3, it has a strong overall structure and no weak points at the splicing. The hoop 1 has an internal thread groove that matches the thread of the fastening screw 2, forming a threaded transmission mechanism. It allows the fastening screw 2 to pass through and cooperate with the thread groove of the annular hoop 3. By turning the screw, the free end of the hoop is driven to move, thereby achieving circumferential tightening of the hoop.

[0031] In use, the annular hoop 3 is wrapped around the outer circumference of the pier to be reinforced, with the free end passing through the hoop shell 1 to form a closed loop. The tightening screw 2 is then screwed on using an external device. The threaded engagement between the screw and the hoop / shell generates tangential tension in the annular hoop 3, causing it to tighten continuously. At this point, the device acts as an external stirrup for the pier, while the pier to be reinforced resembles the core concrete. The circumferential constraint pressure generated by the tightening of the hoop acts on the outer wall 6 of the pier, significantly improving the axial bearing capacity and structural stability of the pier. Figure 3-5 As shown.

[0032] Meanwhile, the reinforcement effect of this device can be predicted through mechanical analysis. By introducing parameters such as the fit coefficient, prestress loss coefficient, and circumferential uniformity coefficient, the effects of factors such as rubber protective layer compression and unevenness of the bridge pier surface in actual engineering are corrected, ensuring that the calculation results are highly consistent with the actual engineering situation and providing a reliable basis for reinforcement design and construction control.

[0033] The reinforcement device in this embodiment does not need to be customized according to the circumference of the bridge pier. The free end of the annular band 3 can be flexibly inserted into the hoop shell 1. By adjusting the circumferential length, it can be adapted to bridge piers with different sizes of circular cross-sections. For bridge piers with non-circular cross-sections, the fit shape of the rubber protective layer can be adjusted, and the plastic adaptability of the band itself can be combined to achieve a tight wrap around the outer circumference of the bridge pier, greatly improving the applicability of the device.

[0034] Example 2 This embodiment, based on the pier reinforcement device described in Embodiment 1, provides a targeted construction method for reinforcing C30 concrete piers with a radius R = 0.6m and a height h = 6m. The goal is to increase the axial strength of the pier by 10MPa. The specific construction steps are as follows: S1. First, conduct a comprehensive review of the damaged areas of pier 5 to confirm that the areas requiring reinforcement have no serious structural damage or hidden defects, ensuring the reliability of the reinforcement foundation; based on the designed reinforcement range, mark three installation elevations and circumferential positioning lines on the outer wall 6 of pier 5 with ink lines, namely position a (1m from the top of the pier), position b (2m from the top of the pier), and position c (4m from the top of the pier). Figure 6 As shown, the height of each installation position matches the effective width of the device to ensure that the device is perpendicular to the pier axis after installation, thus avoiding local stress concentration caused by twisting during installation.

[0035] Temporary supports and work platforms were erected near the marked installation locations. The height of the supports was matched with the installation elevation. Guardrails and fall protection facilities were installed around the work platform to ensure the safety of construction personnel. Torque wrenches, rotary drive devices, grinding tools, and other equipment required for construction were checked and adjusted to ensure stable equipment performance and precise torque control.

[0036] S2. For the outer wall 6 of the pier at each installation location, use grinding tools to clean and remove laitance, remove dust, oil stains, loose concrete and other impurities from the surface to make the outer wall surface smooth; for any local unevenness or cracks, use repair mortar to level and repair, to ensure that the flatness of the outer wall of the pier meets the requirements for the rubber protective layer to adhere.

[0037] A 2cm thick rubber protective layer is wrapped around the outer wall 6 of the pier after treatment. The width of the rubber protective layer matches the effective width b=1m of the annular hoop 3. The two ends of the protective layer are closed by overlapping, and the overlap length meets the design requirements. It is temporarily fixed with adhesive or clamps to ensure that the rubber protective layer is tightly attached to the outer wall 6 of the pier without hollows or wrinkles, so as to play the role of isolation protection and uniform force transmission.

[0038] S3. Wrap the reinforcing device around the outside of the rubber protective layer and adjust the position of the hoop 1 to a position that is convenient for construction personnel to operate; during the process of wrapping the hoop 3, maintain its axial horizontality and circumferential fit to ensure that the device is basically perpendicular to the axis of the pier 5 and avoid uneven distribution of prestress due to the skewness of the hoop; pass the free end of the hoop 3 through the hoop 1 to form a complete closed loop structure.

[0039] S4. Pass the fastening screw 2 through the internal threaded groove of the hoop 1, and slowly screw it in so that the screw body thread gradually engages with the threaded hole of the hoop 3; during the engagement process, check the smoothness of the thread fit, and confirm that there is no jamming, skipping, or misalignment of the threads. If there are thread impurities or burrs, clean or lubricate them in time; after the screw and hoop threads are initially engaged, place the fastening screw 2 in the initial position that can be continuously rotated to prepare for the subsequent application of prestress.

[0040] S5. Based on the target axial reinforcement strength of 10 MPa, and considering parameters such as the Poisson's ratio of the pier concrete μ=0.2, the pier radius R=0.6m, and the effective width of the hoop b=1m, the circumferential uniformity coefficient ku=0.95 (determined based on on-site strain testing) and the effective force transmission coefficient ηp=0.90 (determined through rubber protective layer adhesion tests and prestress loss monitoring) are introduced. Using mechanical formulas, the required target tensile force P≈5.3×10⁻⁶ 3 KN; simultaneously, verify the tensile stress of the annular hoop 3 section. The pressure is approximately 265 MPa, which is less than the ratio of the allowable tensile stress to the safety factor for Q345 steel, thus meeting the material strength requirements.

[0041] Prestress is applied using a staged method of "pre-tightening – re-tightening – final tightening": First, pre-tightening is performed to initially tighten the hoop 3 until it fits snugly against the rubber protective layer without gaps; then, re-tightening is performed, gradually increasing the torque to generate a certain tension in the hoop, during which the fit of the hoop and the position of the hoop shell are checked; finally, final tightening is performed, controlling the tightening torque with a torque wrench, and ensuring that the hoop reaches the target tension based on the relationship between torque and tension. After each stage of tightening, the fit between the hoop and the rubber protective layer, the positional stability of the hoop shell 1, and the uniformity of circumferential force on the device are checked. After confirming that everything is correct, the fastening screw 2 is locked to prevent loosening, and the excess free end of the hoop 3 is fixed to the device by welding to prevent loosening and slippage during long-term use.

[0042] S6. After the target tension is applied, the outer surface of the device is degreased and derusted to remove oil stains, loose rust, etc. generated during construction and ensure the surface is clean. Then, an epoxy adhesive layer is sprayed to form an anti-corrosion protective layer. The thickness of the epoxy adhesive layer meets the design requirements and can effectively resist the erosion of the external environment such as the atmosphere and rainwater, and extend the service life of the device.

[0043] After the epoxy adhesive layer has fully cured, the appearance, prestressing locking status and key dimensions of the device are checked and accepted: check that the epoxy coating is free from cracks and peeling, the fastening screws are not loose, the hoops are tightly fitted and not warped, and that all indicators meet the design requirements before the installation of the device at this location is completed.

[0044] Remove the temporary support at location a and move it down to location b (2m from the top of the pier). Following the construction process of steps S2-6, complete the treatment of the outer wall of the pier at location b, the laying of the rubber protective layer, the installation of the device, the application of prestress, the protective enclosure, and the acceptance work. Then, continue to move the temporary support down to location c (4m from the top of the pier) and repeat the above process to complete the installation of the third device.

[0045] After all three devices are installed, the entire pier reinforcement project will be inspected to check whether the installation position, prestressing state, and anti-corrosion coating quality of each device meet the design and specification requirements. After the inspection is passed, all temporary supports and work platforms will be removed, tools, materials and other debris in the construction area will be cleaned up, and the site environment will be restored.

[0046] This construction method uses quantitative calculations to guide key construction steps, ensuring accurate application of prestress and controllable reinforcement effects. The construction process requires no large equipment, is easy to operate, and does not affect traffic or navigation under the bridge. After reinforcement, the original cross-sectional dimensions of the bridge pier are not changed, and there is no impact on the surrounding traffic space. It is suitable for reinforcement and renovation projects of concrete bridge piers of similar scale.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A bridge pier reinforcement device, characterized in that, include: The hoop (3) has several threaded holes and is used to wrap around the outer periphery of the pier to be reinforced. The fastening screw (2) has a thread on its body that matches the threaded hole of the hoop (3); The hoop (1) has a threaded groove inside that matches the thread of the fastening screw (2). The hoop (1) and the hoop band (3) are integrally formed at one end. The other end of the hoop band (3) is a free end that extends into the hoop (1). By screwing the fastening screw (2) into the threaded hole of the hoop band (3), the hoop band (3) can be tightened and secured.

2. The bridge pier reinforcement device according to claim 1, characterized in that, The effective thickness t of the hoops (3) is much smaller than the radius R of the pier (5) to be reinforced.

3. A construction method based on the bridge pier reinforcement device according to claim 1 or 2, characterized in that, Includes the following steps: Verify the damaged parts of the bridge pier (5), mark the installation elevation and circumferential positioning line of the bridge pier reinforcement device (4), build temporary supports and set up protective measures, and check the construction equipment; Clean and polish the outer wall (6) of the pier (5), repair local defects, wrap and fix a rubber protective layer of the same width as the hoop (3); The bridge pier reinforcement device (4) is wrapped around the outside of the rubber protective layer. The horizontality and fit of the hoop (3) are adjusted so that the free end of the hoop (3) passes through the hoop shell (1) to form a closed loop. Pass the fastening screw (2) through the hoop (1) so that it engages with the threaded groove of the hoop (1) and the threaded hole of the hoop (3); Rotate the fastening screw (2) and apply the target tension in a graded manner of "pre-tightening - re-tightening - final tightening". After the designed tension is reached, lock the fastening screw (2) to prevent loosening and fix the excess length of the hoop (3). Remove oil and rust from the outer surface of the bridge pier reinforcement device (4) and spray an epoxy adhesive layer.

4. The construction method of the bridge pier reinforcement device according to claim 3, characterized in that, The target tensile force is based on the target enhancement strength. Sure: Where R is the radius of the pier (5) and b is the effective width of the hoop (3), For the Poisson's ratio of the concrete of the bridge pier (5), The circumferential uniformity coefficient is... The effective force transmission coefficient.

5. The construction method of the bridge pier reinforcement device according to claim 4, characterized in that, The effective force transmission coefficient ,in The fit coefficient is 0.80 ≤ ≤1.00, The tensile loss coefficient is 0 ≤ ≤0.

20.

6. The construction method of the bridge pier reinforcement device according to claim 4, characterized in that, The circumferential uniformity coefficient , This is an empirical coefficient, 0.5 ≤ ≤2.0, The circumferential strain dispersion coefficient of the hoop (3) is given.

7. The construction method of the bridge pier reinforcement device according to claim 3, characterized in that, The tension P is indirectly controlled by the tightening torque T of the fastening screw (2). The relationship between torque and tension is as follows: , The empirical torque coefficient is 0.10 ≤ ≤0.30, The nominal diameter of the fastening screw (2) is given.

8. The construction method of the bridge pier reinforcement device according to claim 3, characterized in that, When n pier reinforcement devices (4) are installed along the height direction of the pier (5), the total axial bearing capacity increases. ,in , The cross-sectional area of ​​the bridge pier (5) is... The mutual influence coefficient, , This is an empirical coefficient, 0.3 ≤ ≤1.5, s is the net spacing between adjacent pier reinforcement devices (4).

9. The construction method of the bridge pier reinforcement device according to claim 3, characterized in that, The actual equivalent compressive stress of the hoops (3) on the outer wall (6) of the pier ,and ≤ , For the effective force transmission coefficient, The local bearing capacity coefficient is 0.60 ≤ ≤1.00, The design value of the concrete compressive strength of the bridge pier (5) is given.

10. The construction method of the bridge pier reinforcement device according to claim 3, characterized in that, The tensile stress of the cross section of the hoop (3) must satisfy: in, For the effective thickness of the hoop (3), For the allowable tensile stress of the hoop (3) material, For the safety factor, the value range is 1.10 ≤ ≤2.00.

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