A kind of assembled beam bridge reinforcement component and reinforcement method

Abstract

A prefabricated beam bridge reinforcement component, the beam bridge includes a beam body and a bridge pier and a cap bearing the beam body, the reinforcement component includes a concrete pier, a double limb, a double limb bottom hinge, a steel cross bar, a lower H-shaped steel, an upper H-shaped steel, a stiffening plate, a top plate and an angle adjustment pillar; two double limbs are connected by a steel cross bar to form a prefabricated component; a plurality of prefabricated components are superimposed, a lower H-shaped steel is installed on the double limbs at the top, and the double limbs at the bottom are supported on the cap through the double limb bottom hinge and the concrete piers, an upper H-shaped steel is arranged on the lower H-shaped steel, a top plate is arranged on the top of the upper H-shaped steel through a stiffening plate, the top plate is supported at the reinforcement position at the bottom of the beam body, and the upper H-shaped steel and the lower H-shaped steel are connected by an angle adjustment pillar. The present invention forms a new load-bearing structure by adding a left-right symmetrical prefabricated component and combining the supporting connection structure at the bottom of the beam, which significantly reduces the mid-span bending moment of the beam bridge and effectively prolongs the service life of the bridge.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge reinforcement, and in particular relates to a prefabricated component reinforced beam bridge structure and a reinforcement method. Background Art

[0002] At present, the reinforcement methods for beam bridges mainly include setting external prestressing, pasting steel plates or fiber materials, increasing structural cross-section and other methods. The method of setting external prestressing has the disadvantages of great construction difficulty, large internal force changes and difficulty in control. When the structure height is small, pasting steel plates or fiber materials often cannot achieve the desired effect. The traditional method of increasing the structural cross-section requires the erection of full-height brackets and formwork, which takes a long construction period and affects the navigation under the bridge and the operation of the line. At the same time, the deadweight of the structure is greatly increased.

[0003] It can be seen that the traditional reinforcement method of beam bridges cannot solve the problem of excessive stress on bridges, and does not effectively reduce the maximum internal force distribution of beam bridges under load. Under the action of dead load and live load, the beam body is subjected to excessive bending moment, which exceeds the bearing capacity of the beam body. In particular, the problem of excessive deformation has not been fundamentally and effectively solved. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and to provide a fabricated component reinforced beam bridge structure and a reinforcement method.

[0005] The objective of the present invention is achieved through the following technical solutions:

[0006] A prefabricated beam bridge reinforcement component, the beam bridge includes a beam body and bridge piers and a pedestal supporting the beam body, the reinforcement component includes a concrete pier, a double limb, a double limb bottom hinge, a steel cross bar, a lower H-shaped steel, an upper H-shaped steel, a stiffening plate, a top plate, a side plate, an angle adjustment pillar and an L-shaped connecting plate; two of the double limbs are connected by the steel cross bar to form a prefabricated component; a plurality of the prefabricated components are stacked, the lower H-shaped steel is installed on the double limbs at the top, the double limbs at the bottom are supported on the pedestal through the double limb bottom hinge and the concrete piers, the upper H-shaped steel is provided on the lower H-shaped steel, the top of the upper H-shaped steel is provided with the top plate through the stiffening plate, the top plate is supported at the reinforcement position at the bottom of the beam body, and the upper H-shaped steel and the lower H-shaped steel are connected by angle adjustment pillars.

[0007] Furthermore, the double limbs adopt a steel box beam structure, and each of the assembled components adopts two steel cross bars of equal length, and the two steel cross bars are arranged at equal intervals between the double limbs.

[0008] Furthermore, the reinforcement components are symmetrically arranged in pairs along the direction of the beam body in a span of the beam bridge, and their inclination angle α is determined by the position of the beam body reinforcement position and the position of the pedestal. The beam body reinforcement position takes a range of values ​​from L / 3 to L / 2, where L is a span of the beam bridge, and a span is the distance between two of the piers.

[0009] Furthermore, the length of the top plate is equal to the transverse width of the bottom of the beam body, the width of the top plate is determined by reinforcement design calculation, the top plate is connected and fixed to the bottom of the beam body with adhesive and bolts, and the bolts are arranged symmetrically in double rows.

[0010] Furthermore, two stiffening plates are arranged in parallel between the upper H-shaped steel and the top plate, and also include side plates, which, together with the stiffening plates, the upper H-shaped steel and the top plate, form a box shape.

[0011] Furthermore, the two limbs are provided with L-shaped connecting plates, and the assembled components are connected via the L-shaped connecting plates.

[0012] Furthermore, the upper H-shaped steel includes a first upper flange plate, a first lower flange plate, and a first web connecting the first upper flange plate and the first lower flange plate, and a stiffening rib is further provided between the upper flange plate and the lower flange plate.

[0013] Furthermore, the lower H-shaped steel includes a second upper flange plate, a second lower flange plate, and a second web connecting the second upper flange plate and the second lower flange plate, and a stiffening rib is provided between the second upper flange plate and the second lower flange plate.

[0014] Furthermore, the angle adjustment column is provided between the first lower flange plate and the second upper flange plate, and the angle adjustment column includes an upper support column, a lower support column and a leveling nut. The upper support column is welded and fixed to the bottom of the first lower flange plate of the upper H-shaped steel, and the lower end of the upper support column is sleeved with the leveling nut, and the leveling nut is rotatably connected with the upper support column, and the leveling nut can be rotated relative to the upper support column. The end of the lower support column passes through the second upper flange plate of the lower H-shaped steel and is fixed by a nut, and the lower support column is threadedly connected with the leveling nut. The upper support column is a hollow structure, and the lower support column can be retracted into the middle of the upper support column.

[0015] The present invention also provides a reinforcement method for the above-mentioned assembled beam bridge reinforcement component, which specifically comprises the following steps:

[0016] S1, pouring two caps and the concrete piers with concrete along the direction of the beam body between the two piers of the beam bridge;

[0017] S2. Build a scaffold or make a working platform at the bottom of the beam below the reinforcement position of the beam body, repair the concrete structure at the bottom of the beam, and construct the supporting structure at the bottom of the beam. First, remove the carbonized layer of the concrete at the bottom of the beam and the peeling part of the protective layer, wash it with a high-pressure water gun, replace the rusted and broken steel bars with short steel bars of equal diameter, weld the two ends of the short steel bars of equal diameter to the original steel bars, and finally repair the concrete protective layer with crushed stone epoxy concrete;

[0018] S3, drilling holes in the gap between the longitudinal reinforcement and stirrups at the bottom of the beam of the beam body, and installing fixing bolts for fixing the top plate at the drilled holes at the bottom of the beam at the reinforcement position;

[0019] S4, drilling holes at positions corresponding to the fixing bolts of the top plate and the bottom of the beam, applying adhesive evenly on the upper surface of the top plate, pasting the top plate to the bottom of the beam, and firmly connecting the top plate and the bottom of the beam with expansion bolts, and then welding the stiffening plate to the top plate. The welding construction of the stiffening plate starts from the middle stiffening plate, and is carried out symmetrically from the middle to the two sides;

[0020] S5, welding the upper H-shaped steel to the stiffening plate;

[0021] S6, welding the steel cross bar to the double limbs to form an assembled component, and welding the lower H-shaped steel to the top of one of the assembled components;

[0022] S7, assembling a plurality of the fabricated components, and installing the fabricated component welded with the lower H-shaped steel on the top to form a leg assembly;

[0023] S8. Install the double-limb bottom hinge on the concrete pier, symmetrically install the leg assembly between the two piers at the bottom of the beam body of the beam bridge, use lifting equipment to align the bottom of the leg assembly with the double-limb bottom hinge, and use multiple cables to control the leg assembly to rotate around the center of the double-limb bottom hinge. Adjust the leg assembly to the designed inclination angle α, and install the angle adjustment support in the middle of the lower H-beam and the upper H-beam.

[0024] Furthermore, the concrete pier and the foundation need to undergo stress analysis and structural design before the leg assembly is fixedly installed, the stress on the concrete pier is calculated, the concrete pier is designed and reinforcement is calculated, and the foundation is strength checked and the structural design is verified.

[0025] Furthermore, when the lower H-shaped steel is welded to the top surface of the double limbs, the second web of the lower H-shaped steel should be located at the center of the plane of the assembled component without offset. The first web and the second web of the lower H-shaped steel and the upper H-shaped steel should overlap and be located in the same plane without offset.

[0026] Furthermore, the connection between the top plate and the bottom of the beam body must be checked for shear and bending resistance to ensure that the connection between the top plate and the bottom of the beam is firm and does not slip or suffer damage due to bolt pull-out.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] 1. The prefabricated beam bridge reinforcement component proposed in the present invention forms a new load-bearing structure by adding bilaterally symmetrical prefabricated components and combining the supporting connection structure at the bottom of the beam. The reinforcement structure has a reasonable structure, all components can be prefabricated in the factory, and the prefabricated components can be spliced ​​on site. The reinforcement construction speed is fast. Except for setting up a support below the reinforcement point at the bottom of the beam, no support is required at other positions below the beam bridge. The reinforcement construction will not cause new damage to the original beam body, piers, abutments, abutments and foundations, and can repair existing cracks and damage in the beam body. The reinforcement construction efficiency is high and the reinforcement benefit is significant.

[0029] 2. The prefabricated beam bridge reinforcement component proposed in the present invention adopts a prefabricated component as the load-bearing component of the reinforcement design. Part of the load of the original beam bridge is borne by the prefabricated component. The prefabricated component is an axially compressed component, which has the advantages of reasonable design and good supporting performance. At the same time, a steel cross bar is used to laterally connect the two limbs into a whole. The entire prefabricated component has a large lateral stiffness, will not tilt or instability damage, and has good lateral stability.

[0030] 3. The present invention proposes a supporting connection structure for the reinforcement position of the bottom of the beam, which has the advantages of clear and reasonable force, clear force transmission path, and high bearing capacity. The supporting connection structure can reasonably transmit and support the oblique reaction force of the prefabricated components, ensuring the effective connection and load transfer between the bottom of the beam and the prefabricated components.

[0031] 4. By setting a supporting connection structure at the reinforcement position at the bottom of the beam, the connection between the prefabricated component and the reinforcement position at the bottom of the beam is connected by double H-shaped steel bolts, which has excellent connection performance. The manufacturing error can be eliminated by adjusting the angle of the support, effectively solving the connection problem between the bottom plane of the beam and the prefabricated component.

[0032] 5. The prefabricated beam bridge reinforcement component proposed in the present invention will not affect the navigation under the bridge and the operation of the lines under the bridge during the reinforcement construction process, and can meet the clearance requirements under the bridge after reinforcement. The reinforced bridge structure will not affect the normal navigation under the bridge and the normal passage of the lines under the bridge. This is a special advantage of the present invention.

[0033] 6. Through the symmetrically arranged prefabricated components, double H-shaped steel connection structure and the supporting connection structure at the bottom of the beam, the beam bridge body is provided with multiple supports within the main beam span, the original span of the main beam is greatly reduced, the force of the original beam bridge is optimized, and the force effect of the beam's dead load and live load bending moment is significantly reduced.

[0034] 7. The reinforced beam bridge structure is jointly borne by the beam and two prefabricated components to bear the external load, which greatly reduces the burden of the original beam bridge. The reinforced structure significantly improves the bending and shear bearing capacity of the beam bridge, and the reinforcement effect is remarkable.

[0035] 8. After reinforcement, the damage at the reinforced position at the bottom of the beam will be repaired, which will significantly reduce the vertical displacement of the beam bridge within the span, effectively prevent the development of cracks in the beam bridge under overload, and protect the internal stress-bearing steel bars of the beam bridge from exposure and rust, significantly reducing the load burden and operation risk of the beam bridge, significantly improving the bending and shear bearing capacity and durability of the beam bridge structure, and effectively extending the service life of the bridge. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 A front view of an embodiment of the present invention;

[0037] Figure 2 A side view of an embodiment of the present invention;

[0038] Figure 3 A partial cross-sectional view of an embodiment of the present invention Figure 1 ;

[0039] Figure 4 This is a schematic diagram of the structure of the assembly components in an embodiment of the present invention;

[0040] Figure 5 A partial structural diagram of an embodiment of the present invention Figure 2 ;

[0041] Figure 6 A partial structural diagram of an embodiment of the present invention Figure 3 ;

[0042] Explanation of the accompanying drawings: 1 is the beam body, 2 is the pier, 3 is the cap, 4 is the concrete pier, 5 is the double limb, 6 is the bottom hinge of the double limb, 7 is the steel cross bar, 8 is the lower H-shaped steel, 81 is the second upper flange plate, 82 is the second web plate, 83 is the second lower flange plate, 9 is the upper H-shaped steel, 91 is the first upper flange plate, 92 is the first web plate, 93 is the first lower flange plate, 10 is the stiffening rib, 11 is the stiffening plate, 12 is the top plate, 13 is the side plate, 14 is the angle adjustment pillar, 141 is the upper support column, 142 is the lower support column, 143 is the leveling nut, and 15 is the L-shaped connecting plate. DETAILED DESCRIPTION

[0043] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments, but the protection scope of the present invention is not limited thereto.

[0044] like Figure 1 , Figure 2 and Figure 5 As shown, a prefabricated beam bridge reinforcement component comprises a beam body (1) and a bridge pier (2) and a cap (3) supporting the beam body (1); the reinforcement component comprises a concrete pier (4), a double limb (5), a double limb bottom hinge (6), a steel cross bar (7), a lower H-shaped steel (8), an upper H-shaped steel (9), a stiffening plate (11), a top plate (12) and an angle adjustment support (14); two of the double limbs (5) are connected by the steel cross bar (7) to form a prefabricated component; a plurality of the prefabricated components are stacked, and the top of the prefabricated components are connected to the top of the prefabricated components. The lower H-shaped steel (8) is installed on the double limbs (5), and the double limbs (5) at the bottom thereof are supported on the base (3) through the double limb bottom hinges (6) and the concrete piers (4). The upper H-shaped steel (9) is provided on the lower H-shaped steel (8), and the top plate (12) is provided on the top of the upper H-shaped steel (9) through a stiffening plate (11). The top plate (12) is supported at a reinforcement position at the bottom of the beam body (1), and the lower (9) and the lower H-shaped steel (8) are connected via an angle adjustment support (14).

[0045] like Figure 4 As shown, the double limbs (5) adopt a steel box beam structure, and each of the assembled components adopts two steel cross bars (7) of equal length, and the two steel cross bars (7) are arranged at equal intervals between the double limbs (5).

[0046] like Figure 2 As shown, the reinforcement components are symmetrically arranged in pairs along the direction of the beam body (1) in a span of the beam bridge, and their inclination angle α is determined by the reinforcement position of the beam body (1) and the position of the pedestal (3). The reinforcement position of the beam body (1) takes a range of values ​​from L / 3 to L / 2, where L is a span of the beam bridge, and a span refers to the distance between two piers (2).

[0047] The length of the top plate (12) is equal to the transverse width of the bottom of the beam body (1), the width of the top plate (12) is determined by reinforcement design calculation, and the top plate (12) is connected and fixed to the bottom of the beam body (1) using adhesive and bolts, and the bolts are arranged symmetrically in double rows.

[0048] like Figure 3As shown, two stiffening plates (11) are arranged in parallel between the upper H-shaped steel (9) and the top plate (12), and also include side plates (13), which, together with the stiffening plates (11) and the upper H-shaped steel (9) and the top plate (12), form a box shape.

[0049] like Figure 4 As shown, the two limbs (5) are provided with an L-shaped connecting plate (15), and the assembled components are connected via the L-shaped connecting plate (15).

[0050] like Figure 2 , Figure 3 and Figure 6 As shown, the upper H-shaped steel (9) comprises a first upper flange plate (91), a first lower flange plate (93), and a first web plate (92) connecting the first upper flange plate (91) and the first lower flange plate (93), and a stiffening rib (10) is further provided between the first upper flange plate (91) and the first lower flange plate (93).

[0051] like Figure 2 , Figure 3 and Figure 6 As shown, the lower H-shaped steel (8) comprises a second upper flange plate (81), a second lower flange plate (83), and a second web plate (82) connecting the second upper flange plate (81) and the second lower flange plate (83), and a stiffening rib (10) is provided between the second upper flange plate (81) and the second lower flange plate (83).

[0052] like Figure 6 As shown, the angle adjustment support (14) is provided between the first lower flange plate (93) and the second upper flange plate (81), and the angle adjustment support (14) comprises an upper support column (141), a lower support column (142) and a leveling nut (143), the upper support column (141) is welded and fixed to the bottom of the first lower flange plate (93) of the upper H-shaped steel (9), and the lower end of the upper support column (141) is sleeved with the leveling nut (143), and the leveling nut (143) The lower support column (142) is rotatably connected to the upper support column (141), and the leveling nut (143) can rotate freely relative to the upper support column (141). The end of the lower support column (142) passes through the second upper flange plate (81) of the lower H-shaped steel (8) and is fixed by a nut. The lower support column (142) and the leveling nut (143) are threadedly connected. The upper support column (141) is a hollow structure, and the lower support column (142) can be retracted into the middle of the upper support column (141).

[0053] Reinforcement methods

[0054] The reinforcement method of the above-mentioned prefabricated beam bridge reinforcement component specifically comprises the following steps:

[0055] S1, pouring two caps (3) and the concrete buttresses (4) with concrete in the two piers (1) of the beam bridge along the direction of the beam body (1);

[0056] S2, erecting a scaffold or making a working platform at the bottom of the beam below the beam reinforcement position of the beam body (1), repairing the concrete structure at the bottom of the beam, and constructing the supporting structure at the bottom of the beam. First, the carbonized layer of the concrete at the bottom of the beam and the peeling part of the protective layer are chiseled off, and washed with a high-pressure water gun. The rusted and broken steel bars are replaced with short steel bars of equal diameter, and the two ends of the short steel bars of equal diameter are welded to the original steel bars. Finally, the concrete protective layer is repaired with crushed stone epoxy concrete;

[0057] S3, drilling holes in the gap between the longitudinal reinforcement and stirrups at the bottom of the beam of the beam body (1), and installing fixing bolts for fixing the top plate (12) at the drilled holes at the bottom of the beam at the reinforcement position;

[0058] S4, drilling holes at positions corresponding to the fixing bolts of the top plate (12) and the bottom of the beam, evenly applying adhesive on the upper surface of the top plate (12), pasting the top plate (12) to the bottom of the beam, and firmly connecting the top plate (12) and the bottom of the beam with expansion bolts, and then welding the stiffening plate (11) to the top plate (12), the welding construction of the stiffening plate (11) starting from the middle stiffening plate, first in the middle and then on both sides symmetrically;

[0059] S5. Connecting the upper H-shaped steel (9) and the stiffening plate (11) by welding;

[0060] S6, welding the steel cross bar (7) to the double limbs (5) to form an assembled component, and welding the lower H-shaped steel (8) to the top of one of the assembled components;

[0061] S8, assembling a plurality of the prefabricated components, and installing the prefabricated component welded with the lower H-shaped steel (8) on the top to form a leg assembly;

[0062] S9. Install the double-leg bottom hinge (6) on the concrete pier (4), symmetrically install the leg assembly between the two piers (2) at the bottom of the beam body (1) of the beam bridge, align the bottom of the leg assembly with the double-leg bottom hinge (6) using a lifting device, and simultaneously use a plurality of cables to control the leg assembly so that it rotates around the center of the double-leg bottom hinge (6), adjust the leg assembly to a designed inclination angle α, and install the angle adjustment support (14) between the lower H-shaped steel (8) and the upper H-shaped steel (9).

[0063] The above-mentioned embodiments are preferred implementations of the present invention, but the present invention is not limited to the above-mentioned implementations. Any simple modification, improvement, change, replacement or variation made to the above-mentioned embodiments according to the technical essence of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A reinforcement component for an assembled beam bridge, the beam bridge comprising a beam body (1) and a pier (2) and a cap (3) supporting the beam body (1), characterized in that: The reinforcement component comprises a concrete pier (4), a double limb (5), a double limb bottom hinge (6), a steel cross bar (7), a lower H-shaped steel (8), an upper H-shaped steel (9), a stiffening rib (10), a stiffening plate (11), a top plate (12), a side plate (13), an angle adjustment support (14) and an L-shaped connecting plate (15); two of the double limbs (5) are connected by the steel cross bar (7) to form an assembled component; a plurality of the assembled components are stacked, and the lower H-shaped steel is installed on the double limb (5) at the top. The double limbs (5) at the bottom are supported on the cap (3) through the double limb bottom hinges (6) and the concrete pier (4); the upper H-shaped steel (9) is provided on the lower H-shaped steel (8); the top of the upper H-shaped steel (9) is provided with the top plate (12) through a stiffening plate (11); the top plate (12) is supported at a reinforcement position at the bottom of the beam body (1); the upper H-shaped steel (9) and the lower H-shaped steel (8) are connected via an angle adjustment support (14); The upper H-shaped steel (9) comprises a first upper flange plate (91), a first lower flange plate (93), and a first web plate (92) connecting the first upper flange plate (91) and the first lower flange plate (93), and a stiffening rib (10) is further provided between the first upper flange plate (91) and the first lower flange plate (93); The lower H-shaped steel (8) comprises a second upper flange plate (81), a second lower flange plate (83), and a second web plate (82) connecting the second upper flange plate (81) and the second lower flange plate (83), and a stiffening rib (10) is provided between the second upper flange plate (81) and the second lower flange plate (83); The angle adjustment support (14) is provided between the first lower flange plate (93) and the second upper flange plate (81), and the angle adjustment support (14) comprises an upper support column (141), a lower support column (142) and a leveling nut (143). The upper support column (141) is welded and fixed to the bottom of the first lower flange plate (93) of the upper H-shaped steel (9), and the lower end of the upper support column (141) is sleeved with the leveling nut (143). The leveling nut (143) is screwed to the lower end of the upper support column (141). The upper support column (141) forms a rotational connection, and the leveling nut (143) can rotate relative to the upper support column (141). The end of the lower support column (142) passes through the second upper flange plate (81) of the lower H-shaped steel (8) and is fixed by a nut. The lower support column (142) and the leveling nut (143) form a threaded connection. The upper support column (141) is a hollow structure, and the lower support column (142) can be retracted into the middle of the upper support column (141).

2. The fabricated beam bridge reinforcement component according to claim 1, characterized in that: The double limbs (5) adopt a steel box beam structure, and each of the assembled components adopts two steel cross bars (7) of equal length, and the two steel cross bars (7) are arranged at equal intervals between the double limbs (5).

3. The fabricated beam bridge reinforcement member according to claim 1, characterized in that: The reinforcement components are symmetrically arranged in pairs along the direction of the beam body (1) in a span of the beam bridge, and their inclination angle α is determined by the reinforcement position of the beam body (1) and the position of the pedestal (3). The reinforcement position of the beam body (1) takes a value in the interval from L / 3 to L / 2, and L is the main span of the beam bridge.

4. The fabricated beam bridge reinforcement member according to claim 1, characterized in that: The length of the top plate (12) is equal to the transverse width of the bottom of the beam body (1), the width of the top plate (12) is determined by reinforcement design calculation, and the top plate (12) is connected and fixed to the bottom of the beam body (1) using adhesive and bolts, and the bolts are arranged symmetrically in double rows.

5. The fabricated beam bridge reinforcement component according to claim 1, characterized in that: Two stiffening plates (11) are arranged in parallel between the upper H-shaped steel (9) and the top plate (12), and also include side plates (13) which, together with the stiffening plates (11) and the upper H-shaped steel (9) and the top plate (12), form a box shape.

6. The fabricated beam bridge reinforcement component according to claim 1, characterized in that: The two limbs (5) are provided with an L-shaped connecting plate (15), and the assembled components are connected via the L-shaped connecting plate (15).

7. The reinforcement method of the fabricated beam bridge reinforcement member according to any one of claims 1 to 6, characterized in that: The specific steps include: S1, pouring two caps (3) and the concrete buttresses (4) with concrete between the two piers (2) of the beam bridge along the direction of the beam body (1); S2, erecting a scaffold or making a working platform at the bottom of the beam below the beam reinforcement position of the beam body (1), repairing the concrete structure at the bottom of the beam, and constructing the supporting structure at the bottom of the beam. First, the carbonized layer of the concrete at the bottom of the beam and the peeling part of the protective layer are chiseled off, and washed with a high-pressure water gun. The rusted and broken steel bars are replaced with short steel bars of equal diameter, and the two ends of the short steel bars of equal diameter are welded to the original steel bars. Finally, the concrete protective layer is repaired with crushed stone epoxy concrete; S3, drilling holes in the gap between the longitudinal reinforcement and stirrups at the bottom of the beam of the beam body (1), and installing fixing bolts for fixing the top plate (12) at the drilled holes at the bottom of the beam at the reinforcement position; S4, drilling holes at positions corresponding to the fixing bolts of the top plate (12) and the bottom of the beam, evenly applying adhesive on the upper surface of the top plate (12), pasting the top plate (12) to the bottom of the beam, and firmly connecting the top plate (12) and the bottom of the beam with expansion bolts, and then welding the stiffening plate (11) to the top plate (12), the welding construction of the stiffening plate (11) starting from the middle stiffening plate, first in the middle and then on both sides symmetrically; S5, welding the upper H-shaped steel (9) to the stiffening plate (11); S6, welding the steel cross bar (7) to the double limbs (5) to form an assembled component, and welding the lower H-shaped steel (8) to the top of one of the assembled components; S7, assembling a plurality of the prefabricated components, and installing the prefabricated component welded with the lower H-shaped steel (8) on the top to form a leg assembly; S8. Install the double-leg bottom hinge (6) on the concrete pier (4), symmetrically install the leg assembly between the two piers (2) at the bottom of the beam body (1) of the beam bridge, align the bottom of the leg assembly with the double-leg bottom hinge (6) using a lifting device, and simultaneously use a plurality of cables to control the leg assembly so that it rotates around the center of the double-leg bottom hinge (6), adjust the leg assembly to a designed inclination angle α, and install the angle adjustment support (14) between the lower H-shaped steel (8) and the upper H-shaped steel (9).

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