A bridge pier lifting and reinforcement device and construction method

Abstract

The present invention relates to a bridge pier lifting and reinforcement device and a construction method, comprising an upper and lower groups of clamping mechanisms, each group of clamping mechanisms comprising two front and rear clamping plates, the lower end surface of the upper clamping plate and the upper end surface of the lower clamping plate are respectively fixed with horizontal support plates, a plurality of vertically placed hydraulic cylinders are arranged between the support plates on the upper and lower sides, a positioning block is respectively arranged between every two hydraulic cylinders, the positioning block is always located in the middle of the interval between the upper and lower support plates, a positioning plate is fixed on the inner end surface of each support plate, the inner side surface of the positioning block is always in contact with the outer edge surface of the positioning plate, when the upper and lower groups of clamping mechanisms move away from each other, the positioning block exerts an inward extrusion force on the positioning plate, and the greater the distance, the greater the extrusion force; the present invention continuously applies an inward extrusion force to the positioning plate during jacking by arranging positioning blocks in multiple directions, thereby ensuring that the upper section pier does not deviate from the axis during the jacking process, and avoiding the deviation of the axis affecting the overall supporting strength of the pier.

Description

Technical Field

[0001] The invention relates to the field of bridge construction, and in particular to a bridge pier lifting and reinforcement device and a construction method. Background Art

[0002] When constructing the broken columns of existing bridge piers, it is necessary to first build a support platform, and then place multiple groups of hydraulic cylinders between the support platform and the ground to lift the bridge column. When building the support platform, it is necessary to build steel bars, molds and pour concrete. The subsequent lifting can only be carried out after the concrete is completely hardened. The construction period is long and the cost is high. After the lifting is completed, the support platform is difficult to remove, which affects the appearance. Moreover, due to the influence of the bridge structure during lifting, each hydraulic cylinder bears different gravity and the lifting rate is difficult to unify, which easily leads to the deviation of the axis of the upper and lower piers, which greatly affects the subsequent support strength and is difficult to correct. Moreover, when welding steel bars for broken columns in the existing technology, support is usually provided by welding a new end of the steel bars between the original steel bars. The strength of the steel bars after welding is difficult to reach the strength standard before the fracture, and the support strength of the pier column after lifting will also be affected.

[0003] The jacking device for replacing the support of a single-column pier with the announcement number CN 211256681 U discloses a hoop-type jacking support structure, and monitors the jacking displacement of each hydraulic jack through a displacement sensor, and then corrects it by manually adjusting the opening and closing degree of the jack control valve. Although this technical solution can solve the problem of non-uniform jack displacement, it still has the following defects:

[0004] 1. The clamp can only be applied to the upper end of the pier column. The position of the clamp is limited, and it is difficult to apply it to the jacking reinforcement operation at any position of the bridge pier column;

[0005] 2. After the displacement sensor is used to measure the height of the hydraulic cylinder, the hydraulic cylinder needs to be manually adjusted. The operation process is cumbersome, and it is difficult to adjust accurately by manual operation, which also poses risks.

[0006] 3. This solution still has the risk of pier column deflection, and can only be corrected after the pier column deflects. The overturning moment generated during deflection is likely to cause stress concentration on the supporting structure, thereby reducing the service life of the supporting structure and posing a safety hazard. This solution cannot prevent pier column deflection in advance and cannot share the overturning moment when the pier column deflects. Summary of the invention

[0007] In view of the above situation, in order to overcome the defects of the prior art, the present invention adopts a bridge pier lifting and reinforcement device, which solves the problems in the prior art of long bridge pier lifting period and high cost, poor lifting coaxiality and stress concentration when the bridge or pier is tilted.

[0008] The technical solution is a bridge pier lifting and reinforcement device, including two sets of upper and lower clamping mechanisms, each set of clamping mechanisms includes two front and rear clamping plates, the clamping plates are arc-shaped plates with their axes vertically placed, the two clamping plates can form a cylinder after being buckled together and can be fixedly connected, the lower end surface of the upper clamping plate and the upper end surface of the lower clamping plate are respectively fixed with horizontal support plates, the support plates are fan-shaped plates and the inner end surfaces do not exceed the inner edge surfaces of the clamping plates, a plurality of vertically placed hydraulic cylinders are arranged between the support plates on the upper and lower sides, the hydraulic cylinders are arranged at equal intervals, and every two hydraulic A first positioning block is respectively arranged between the cylinders, and the first positioning blocks are evenly distributed along the circumference of the axis of the clamping plate. The first positioning block is always located in the middle of the interval between the upper and lower support plates. A positioning plate is fixed on the inner end face of each support plate. The positioning plate is an arc-shaped plate. The positioning plate is coaxial with the clamping plate and has a diameter larger than the clamping plate. The two positioning plates can form a cylinder after being buckled with each other. The inner side surface of the first positioning block is always in contact with the outer edge surface of the positioning plate. When the upper and lower sets of clamping mechanisms move away from each other, the first positioning block exerts an inward extrusion force on the positioning plate, and the greater the distance, the greater the extrusion force.

[0009] A plurality of vertical ribs are fixed between each of the support plates and the outer edge surface of the clamping plate. The ribs are arranged at equal intervals. The ribs on the left and right sides are flush with the vertical end surfaces of the clamping plates and are provided with a plurality of through holes from top to bottom. After the front and rear clamping plates of the same clamping device are buckled with each other, the through holes on the ribs on the left and right sides of the front and rear clamping plates correspond to each other. Bolts can be passed through the front and rear through holes and then the ribs can be fixedly connected using nuts with an outer diameter larger than the through holes, so that the positions of the front and rear clamping plates are fixed and the bridge piers are clamped.

[0010] A connecting rod is hinged between each two hydraulic cylinders on the outer edge surface of the support plate, and a pressure block is arranged on the outside of each first positioning block. The upper and lower ends of the pressure block are hinged to the connecting rods on the upper and lower sides respectively, and the hinge points of the connecting rod and the pressure block are always located on the outside of the hinge points of the connecting rod and the support plate. The inner side of the pressure block is fixedly connected to the first positioning block through a horizontally placed telescopic rod, and the inner rod and the outer rod of the telescopic rod are connected by a compression spring. A sliding block is arranged in the middle of each telescopic rod, and a horizontal horizontal hole is opened in the middle of the sliding block. The telescopic rod passes through the horizontal hole and can slide in and out along the horizontal hole. A vertical rod is fixed to the upper end surface of the lower support plate below each sliding block, and a vertical hole is opened on each sliding block. The vertical rod passes through the vertical hole, and the sliding block can slide up and down along the vertical rod.

[0011] A material baffle plate is arranged on the inner side of each positioning plate. The material baffle plate is an arc-shaped plate with an outer diameter equal to the inner diameter of the positioning plate. The material baffle plate can slide up and down in close contact with the positioning plate. The upper and lower material baffle plates can move toward the middle and connect with each other to form a sealed cavity inside the positioning plate.

[0012] A clamping ring is fixed to one end face of the baffle plate away from the support plate. Bolt holes penetrating the upper and lower end faces are provided on the clamping ring. The clamping rings on the upper and lower sides can be fixedly connected by bolts.

[0013] A second positioning block is fixed on the inner end face of the middle part of the first positioning block, and each retaining ring is provided with a clearance groove at the vertical projection position of the second positioning block on the retaining ring. When the baffle plate moves toward the middle and engages with each other, the second positioning block is placed in the clearance groove and can prevent the baffle plate from moving.

[0014] Each support plate is provided with an opening on the inner side of the positioning plate, and each opening is provided with a stopper which can block the opening.

[0015] Compared with the prior art, the present invention has the following advantages:

[0016] 1. The present invention fixes the lifting force-bearing components on the pier itself, and the fixing method is convenient and fast, which greatly shortens the construction period and lifting cost;

[0017] 2. By setting the first positioning blocks in multiple positions to continuously apply an inward extrusion pressure to the positioning plate during the jacking process, it is ensured that the upper pier does not deviate from the axis during the jacking process, and the deviation of the axis will not affect the overall support strength of the pier. At the same time, when the fixed height of the hydraulic cylinder is inconsistent, the first positioning block on the side with a larger jacking height is subjected to a greater extrusion force from the compression spring, and the first positioning block exerts a greater extrusion force on the positioning plate. The opposite connecting rods exert an extrusion force on the upper and lower support plates to approach each other. This extrusion force can increase the bearing capacity of the hydraulic cylinder on the side with a larger jacking height, forcing it to share the bearing capacity of the hydraulic cylinder on the side with a larger force, thereby improving the problem of different jacking heights of the hydraulic cylinders caused by uneven force.

[0018] 3. The positioning plate can be used to correct the coaxiality and provide a template for subsequent concrete pouring, thereby improving the pouring efficiency;

[0019] 4. A steel cage is arranged on the outside of the pier column to fix the steel cage to the original pier column steel bars, and concrete is poured into the inner cavity of the baffle plate to form a sleeve-like structure that wraps around the outside of the fractured part of the pier column. Compared with the prior art of only connecting and welding the original pier column steel bars, the support strength of the fracture position can be greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is the front view of the present invention.

[0021] Figure 2 It is a top view of the present invention.

[0022] Figure 3 It is a front cross-sectional view of the present invention fixed on a pier column.

[0023] Figure 4For the present invention Figure 2 Sectional view of AA after the pier is lifted.

[0024] Figure 5 It is a schematic diagram of the steel bar connection of the present invention.

[0025] Figure 6 This is a stereoscopic view of the present invention without the baffle plate and the hydraulic cylinder.

[0026] Figure 7 This is a state diagram of the clamping plate, the supporting plate and the positioning plate of the present invention when the lifting heights of the hydraulic cylinder are inconsistent.

[0027] Figure 8 It is a stereoscopic diagram of the pressing block and the telescopic rod of the present invention. DETAILED DESCRIPTION

[0028] The specific implementation modes of the present invention are further described in detail below in conjunction with the accompanying drawings.

[0029] Depend on Figures 1 to 8 The present invention comprises two sets of clamping mechanisms, each set of clamping mechanisms comprises two front and rear clamping plates 1, the clamping plates 1 are arc-shaped plates with their axes vertically placed, the two clamping plates 1 can form a cylinder after being buckled together and can be fixedly connected, the lower end surface of the upper clamping plate 1 and the upper end surface of the lower clamping plate 1 are respectively fixed with horizontal support plates 2, the support plates 2 are fan-shaped plates and the inner end surfaces do not exceed the inner edge surfaces of the clamping plates 1, a plurality of vertically placed hydraulic cylinders 3 are arranged between the support plates 2 on the upper and lower sides, the hydraulic cylinders 3 are arranged at equal intervals, and one is respectively arranged between every two hydraulic cylinders 3. The first positioning block 4 is evenly distributed along the circumference of the axis of the clamping plate 1. The first positioning block 4 is always located in the middle of the interval between the upper and lower support plates. A positioning plate 5 is fixed to the inner end face of each support plate 2. The positioning plate 5 is an arc-shaped plate. The positioning plate 5 is coaxial with the clamping plate 1 and has a diameter larger than the clamping plate 1. The two positioning plates 5 can form a cylinder after being buckled together. The inner side surface of the first positioning block 4 is always in contact with the outer edge surface of the positioning plate 5. When the upper and lower sets of clamping mechanisms move away from each other, the first positioning block 4 exerts an inward extrusion force on the positioning plate 5, and the greater the distance, the greater the extrusion force.

[0030] A plurality of vertical ribs 7 are fixed between each of the support plates 2 and the outer edge surface of the clamping plate 1. The ribs 7 are arranged at equal intervals. The ribs 7 on the left and right sides are flush with the vertical end surfaces of the clamping plates 1 and are provided with a plurality of through holes 8 from top to bottom. After the front and rear clamping plates 1 of the same clamping device are buckled with each other, the through holes 8 on the ribs 7 on the left and right sides of the front and rear clamping plates 1 correspond to each other, and the ribs 7 can be fixedly connected by nuts having an outer diameter larger than the through holes 8 after bolts penetrate through the front and rear through holes 8, so that the positions of the front and rear clamping plates 1 are fixed and the bridge piers are clamped.

[0031] A connecting rod 9 is hinged between each two hydraulic cylinders 3 on the outer edge surface of the support plate 2, and a pressure block 10 is respectively arranged on the outside of each first positioning block 4. The upper and lower ends of the pressure block 10 are respectively hinged to the connecting rods 9 on the upper and lower sides, and the hinge points of the connecting rods 9 and the pressure block 10 are always located on the outside of the hinge points of the connecting rods 9 and the support plate 2. The inner side of the pressure block 10 is fixedly connected to the first positioning block 4 through a horizontally placed telescopic rod 11, and the inner rod and the outer rod of the telescopic rod 11 are connected by a compression spring. A slider 12 is respectively arranged in the middle of each telescopic rod 11, and a horizontal horizontal hole 13 is opened in the middle of the slider 12. The telescopic rod 11 penetrates the horizontal hole 13 and can slide in and out along the horizontal hole. A vertical rod 14 is respectively fixed to the upper end surface of the lower support plate 2 below each slider 12, and a vertical hole 15 is respectively opened on each slider 12. The vertical rod 14 penetrates the vertical hole 15, and the slider 12 can slide up and down along the vertical rod 14.

[0032] A baffle plate 16 is arranged on the inner side of each positioning plate 5. The baffle plate 16 is an arc-shaped plate with an outer diameter equal to the inner diameter of the positioning plate 5. The baffle plate 16 can slide up and down in accordance with the positioning plate 5. The upper and lower baffle plates 16 can move toward the middle and connect with each other to form a sealed cavity inside the positioning plate 5.

[0033] A clamping ring 17 is fixed to one end face of the baffle plate 16 away from the support plate 2 . Bolt holes penetrating the upper and lower end faces are provided on the clamping ring 17 . The clamping ring 17 on the upper and lower sides can be fixedly connected by bolts.

[0034] A second positioning block 18 is fixed to the inner end face of the middle part of the first positioning block 4, and a clearance groove 19 is opened on each retaining ring 17 at the vertical projection position of the second positioning block 18 on the retaining ring 17. When the baffle plate 16 moves toward the middle and engages with each other, the second positioning block 18 is placed in the clearance groove 19 and the second positioning block 18 can prevent the baffle plate 16 from moving.

[0035] An opening 21 is formed on each support plate 2 at the inner side of the positioning plate 5 , and a stopper 22 is disposed on each opening 21 . The stopper 22 can block the opening 21 .

[0036] When the present invention is used, firstly, the upper and lower sets of clamping mechanisms are fixed on the bridge piers that need to be lifted, that is, the front and rear clamping plates 1 of each set of clamping mechanisms are buckled on the front and rear sides of the piers, and then the rib plates 7 are fixedly connected by nuts with an outer diameter larger than the through holes 8 after the bolts penetrate the front and rear side through holes 8, and then the piers are cut, and then the hydraulic cylinder 3 is started to lift the upper section of the piers upward until it is lifted to the required height, and the outer edge surface of the cut part of the pier is destroyed to expose the steel bars to the outside, as shown in the attached figure. Figure 4As shown; during the lifting process of the hydraulic cylinder 3, as the interval between the upper and lower support plates 2 gradually increases, all the pressure blocks 10 move inwards driven by the connecting rod 9, and the pressure blocks 10 press the first positioning block 4 inwards through the compression spring on the inner side of the telescopic rod 11, so that the greater the lifting height of the hydraulic cylinder 3, the greater the pressing force of the pressure block 10 on the first positioning block 4, and the greater the pressing force of the first positioning block 4 on the positioning plate 5, to prevent the contact area between the first positioning block 4 and the positioning plate 5 from decreasing as the lifting height increases, thereby affecting the positioning effect of the first positioning block 4;

[0037] During the lifting process, due to the influence of the bridge structure, each hydraulic cylinder bears different gravity and the lifting rate is difficult to unify, which easily leads to inconsistent lifting heights of the hydraulic cylinders. Figure 7 The axis is offset as shown in the figure. Since the first positioning block 4 always gives the positioning plate 5 an inward squeezing force through the compression spring, it can assist in positioning the upper pier column. When the hydraulic cylinder jacking height is inconsistent, the angle between the upper and lower connecting rods 9 on the side with a larger jacking height is greater than that on the side with a smaller jacking height. The first positioning block 4 on the side with a larger jacking height is subjected to a greater squeezing force from the compression spring, and the squeezing force of the first positioning block 4 on the positioning plate 5 is greater. On the contrary, the connecting rods 9 give the support plates 2 on the upper and lower sides a squeezing force approaching each other. This squeezing force can increase the bearing capacity of the hydraulic cylinder 3 on the side with a larger jacking height, forcing it to share the bearing capacity of the hydraulic cylinder on the side with a larger force, thereby improving the problem of different jacking heights of the hydraulic cylinder 3 caused by uneven force.

[0038] After the jacking is completed, new steel bars are welded to the steel bar fractures through the positioning plates 5 on the upper and lower sides to connect the original pier column steel bars up and down, and then the vertical steel bars are placed into the inner cavity of the positioning plates 5 through the openings 21 on the upper and lower sides, and the steel bars are evenly distributed along the circumference of the pier column. All the steel bars are welded together through the ring steel bars to form a steel cage wrapped around the outside of the pier column, and the steel bars in the middle of the steel cage are welded to the steel bars connecting the circular pier column, as shown in the attached figure. Figure 5 As shown, the baffle plates 16 on the upper and lower sides are then buckled and fixed with bolts, all lower openings 21 are blocked with baffles 22, and concrete is poured into the cavity between the positioning plates 5 through the upper openings 21 to fill the cavity with concrete; after the concrete is completely hardened, the bolts on the rib plates 7 are removed to separate the clamping plates 1 on the front and rear sides from each other to achieve disassembly of the device.

[0039] It is worth mentioning that by adding a pressure detection sensor between the upper and lower ends of the first positioning block 4 and the positioning plate 5, real-time monitoring can be carried out, and the sensor can be correlated with the hydraulic cylinder 3 on the corresponding side. When the pressure between the first positioning block 4 and the positioning plate 5 in a certain direction is too high, feedback can be given to the hydraulic cylinder 3 to adjust the jacking rate.

[0040] The present invention fixes the lifting force-bearing components on the pier itself, which is convenient and quick to fix, greatly shortening the construction period and lifting cost;

[0041] By setting the first positioning blocks 4 in multiple directions to continuously apply an inward extrusion pressure to the positioning plate 5 during the jacking process, it is ensured that the upper pier does not deviate from the axis during the jacking process, and the deviation of the axis avoids affecting the overall supporting strength of the pier. At the same time, when the fixed heights of the hydraulic cylinders are inconsistent, the first positioning block 4 on the side with a larger jacking height is subjected to a greater extrusion force from the compression spring, and the extrusion force of the first positioning block 4 on the positioning plate 5 is greater. The opposite connecting rods 9 give the upper and lower support plates 2 an extrusion pressure approaching each other. The extrusion pressure can increase the bearing capacity of the hydraulic cylinder 3 on the side with a larger jacking height, forcing it to share the bearing capacity of the hydraulic cylinder on the side with a larger force, thereby improving the problem of different lifting heights of the hydraulic cylinder 3 caused by uneven force. While correcting the coaxiality through the positioning plate 5, it can also provide a template for subsequent concrete pouring, thereby improving the pouring efficiency.

[0042] By arranging a steel cage on the outside of the pier column and fixing the steel cage to the original pier column steel bars, the support strength at the fracture position can be greatly improved compared to the prior art of only connecting and welding the original pier column steel bars.

Claims

1. A bridge pier lifting and reinforcement device, characterized in that: The invention comprises two sets of clamping mechanisms, one set of which is an upper set and the other set of which comprises two front and rear clamping plates (1). The clamping plates (1) are arc-shaped plates with their axes vertically placed. The two clamping plates (1) can form a cylinder when they are buckled together and can be fixedly connected. The lower end surface of the upper clamping plate (1) and the upper end surface of the lower clamping plate (1) are respectively fixed with support plates (2) in a horizontal direction. The support plates (2) are fan-shaped plates and their inner end surfaces do not exceed the inner edge surfaces of the clamping plates (1). A plurality of vertically placed hydraulic cylinders (3) are arranged between the support plates (2) on the upper and lower sides. The hydraulic cylinders (3) are arranged at equal intervals. A first positioning block (2) is respectively arranged between every two hydraulic cylinders (3). 4), the first positioning blocks (4) are evenly distributed along the circumference of the axis of the clamping plate (1), the first positioning blocks (4) are always located in the middle of the interval between the upper and lower support plates, a positioning plate (5) is fixed to the inner end surface of each support plate (2), the positioning plate (5) is an arc-shaped plate, the positioning plate (5) is coaxial with the clamping plate (1) and has a diameter larger than the clamping plate (1), the two positioning plates (5) can form a cylinder after being buckled together, the inner side surface of the first positioning block (4) is always in contact with the outer edge surface of the positioning plate (5), when the upper and lower clamping mechanisms are away from each other, the first positioning block (4) exerts an inward extrusion force on the positioning plate (5), and the greater the distance, the greater the extrusion force; A connecting rod (9) is hingedly connected between each two hydraulic cylinders (3) on the outer edge surface of the support plate (2), and a pressing block (10) is arranged on the outer side of each first positioning block (4). The upper and lower ends of the pressing block (10) are respectively hingedly connected to the connecting rods (9) on the upper and lower sides, and the hinge point between the connecting rod (9) and the pressing block (10) is always located on the outer side of the hinge point between the connecting rod (9) and the support plate (2). The inner side surface of the pressing block (10) is fixedly connected to the first positioning block (4) through a horizontally placed telescopic rod (11), and the inner rod of the telescopic rod (11) is connected to the first positioning block (4). The outer rods are connected by compression springs. A slider (12) is provided in the middle of each telescopic rod (11). A horizontal hole (13) is provided in the middle of the slider (12). The telescopic rod (11) passes through the horizontal hole (13) and can slide inward and outward along the horizontal hole. A vertical rod (14) is fixed to the upper end surface of the lower support plate (2) below each slider (12). A vertical hole (15) is provided on each slider (12). The vertical rod (14) passes through the vertical hole (15). The slider (12) can slide up and down along the vertical rod (14).

2. A bridge pier lifting and reinforcement device according to claim 1, characterized in that: A plurality of ribs (7) in the vertical direction are fixed between each of the support plates (2) and the outer edge surface of the clamping plate (1), and the ribs (7) are arranged at equal intervals. The ribs (7) located on the left and right sides are flush with the vertical end surfaces of the clamping plates (1) and are provided with a plurality of through holes (8) from top to bottom. After the front and rear clamping plates (1) of the same clamping device are buckled together, the through holes (8) on the left and right ribs (7) of the front and rear clamping plates (1) correspond to each other, and the ribs (7) can be fixedly connected by nuts having an outer diameter larger than that of the through holes (8) after bolts penetrate the front and rear through holes (8), so that the positions of the front and rear clamping plates (1) are fixed and the bridge pier is clamped.

3. A bridge pier lifting and reinforcement device according to claim 1, characterized in that: Each of the positioning plates (5) is provided with a material baffle plate (16) on the inner side thereof. The material baffle plate (16) is an arc-shaped plate with an outer diameter equal to the inner diameter of the positioning plate (5). The material baffle plate (16) can slide up and down in close contact with the positioning plate (5). The upper and lower material baffle plates (16) can move toward the middle and connect to each other so that the inner cavity of the positioning plate (5) forms a sealed cavity.

4. A bridge pier raising and reinforcing device according to claim 3, characterized in that: A clamping ring (17) is fixed to one end face of the baffle plate (16) away from the support plate (2), and bolt holes penetrating the upper and lower end faces are provided on the clamping ring (17), so that the clamping rings (17) on the upper and lower sides can be fixedly connected by bolts.

5. A bridge pier raising and reinforcing device according to claim 4, characterized in that: A second positioning block (18) is fixed to the inner end face of the middle part of the first positioning block (4), and each retaining ring (17) is provided with a clearance groove (19) at a vertical projection position of the second positioning block (18) on the retaining ring (17). When the baffle plate (16) moves toward the middle and engages with each other, the second positioning block (18) is placed in the clearance groove (19) and the second positioning block (18) can prevent the baffle plate (16) from moving.

6. The bridge pier raising and reinforcing device according to claim 1, characterized in that: Each of the support plates (2) is provided with an opening (21) on the inner side of the positioning plate (5), and each opening (21) is provided with a stopper (22), which can block the opening (21).

7. A construction method for a bridge pier lifting and reinforcement device according to any one of claims 1 to 6, characterized in that: The steps include: S1. Fixing the upper and lower sets of clamping mechanisms respectively on the bridge piers at the parts to be cut, and clamping the piers by bolting the clamping plates (1) that are interlocked with each other; S2, starting the hydraulic cylinder (3) to pre-support the support plates on the upper and lower sides, and cutting off the portion of the pier column located in the middle of the interval between the upper and lower support plates (2); S3, start the hydraulic cylinder to lift the upper pier column upward; S4. After the jacking is completed, new steel bars are manually welded to the broken ends of the steel bars through the positioning plates (5) on the upper and lower sides to connect the original steel bars of the pier column up and down. Then, vertical steel bars are placed into the inner cavity of the positioning plates (5) and evenly distributed along the circumference of the pier column. All the steel bars are welded together through the ring steel bars to form a steel cage wrapped around the outside of the pier column. The steel bars in the middle of the steel cage are welded to the steel bars connecting the circular pier column. S5. Concrete is poured into the inner cavity of the positioning plate (5). After the concrete is completely hardened, it forms a sleeve shape and wraps around the outer side of the fractured part of the pier column. Then, the bolts on the rib plate (7) are removed to separate the holding plates (1) on the front and rear sides from each other, thereby realizing the disassembly of the device.

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