Rapid widening, connecting and reinforcing structure for existing bridge and construction method

Abstract

The invention belongs to the field of bridge structures, and particularly relates to a rapid widening, connecting and reinforcing structure for an existing bridge and a construction method. The invention provides a rapid widening, connecting and reinforcing structure for an existing bridge and a construction method. Longitudinal connecting units of two existing bridges are arranged on webs of the two existing bridges which are transversely arranged side by side, a bridge deck pavement unit is arranged above the existing bridges, and vertical connecting units connected with the longitudinal connecting units and the bridge deck pavement unit are arranged in the vertical direction of the existing bridges in a penetrating mode. A rapid reinforcing unit for connecting a longitudinal connecting unit and a bridge deck pavement unit is arranged on an existing bridge wing plate, so that two existing bridges can be rapidly spliced through the existing bridge rapid splicing, widening, connecting and reinforcing structure; the overall structural strength is guaranteed, meanwhile, the bridges on the two sides are prevented from deviating to different degrees, and the working efficiency is greatly improved.

Description

Technical Field

[0001] The invention belongs to the field of bridge structures, and in particular relates to a rapid widening, connecting and reinforcing structure of an existing bridge and a construction method. Background Art

[0002] Compared with new construction, bridge widening and reconstruction face many special problems, including the impact of the lateral and longitudinal displacement of concrete after splicing on the mechanical performance of the widened bridge. This problem has always affected the construction and operational safety of renovated and expanded bridges. Domestic and foreign scholars have conducted corresponding research on these aspects, but it is still not comprehensive and mature. Therefore, it is necessary to conduct more in-depth research on this type of widening problem.

[0003] The Chinese invention patent with patent publication number CN110258289A and publication date September 20, 2019, discloses a transverse widening structure for a prestressed concrete continuous box girder bridge, including a corrugated steel plate, with a number of longitudinal distribution steel bars connected below the corrugated steel plate, transverse connecting steel bars connected below the longitudinal distribution steel bars, and transverse connecting steel bars connected on both sides of the flange of the corrugated steel plate. The corrugated steel plate is provided with indentation holes, a fiber-reinforced cement-based material is cast on the top, and a concrete material is sprayed on the bottom.

[0004] The transverse widening structure of the prestressed concrete continuous box girder bridge in this Chinese invention patent has the following general usage and advantages: a number of longitudinal distribution steel bars are welded under the corrugated steel plate, and lateral connecting steel bars are welded under the longitudinal distribution steel bars. Transverse connecting steel bars are welded on both sides of the flange of the corrugated steel plate, and indentation holes are opened on the corrugated steel plate. ECC high-toughness fiber-reinforced cement-based composite materials are cast above the corrugated steel plate. The invention places the corrugated steel plate in the transverse widening structure, which can be used as a permanent formwork for pouring the cast-in-place concrete above, saving the time of setting up scaffolding and installing and removing the formwork during construction, greatly shortening the construction period and saving costs.

[0005] However, in actual use, the transverse widening structure of the prestressed concrete continuous box girder bridge still has at least the following shortcomings. In other words, these are the technical problems to be solved by the present invention: although the splicing structure of the transverse widening structure of the prestressed concrete continuous box girder bridge directly uses corrugated steel plates to greatly improve work efficiency, it still requires welding steel bars between the corrugated steel plates and the bridge, and the welding of multiple sections of steel bars reduces the strength of the overall structure, and the bridges on both sides are very likely to have unbalanced displacements.

[0006] Therefore, in summary, there is an urgent need for a fast widening and connection reinforcement structure for existing bridges with higher overall structural strength and efficient operation to solve the problems of this type. Summary of the Invention

[0007] The present invention provides a rapid widening and connection reinforcement structure and construction method for an existing bridge, which can achieve rapid splicing of two existing bridges through the webs of two existing bridges arranged side by side in a transverse manner, by arranging two longitudinal connection units of the existing bridges, arranging a bridge deck pavement unit above the existing bridge, arranging a vertical connection unit connected to the longitudinal connection unit and the bridge deck pavement unit in the vertical direction of the existing bridge, and arranging a rapid reinforcement unit connecting the longitudinal connection unit and the bridge deck pavement unit on the wing plate of the existing bridge. The rapid widening and connection reinforcement structure for existing bridges described in the present application can ensure the overall structural strength while avoiding different degrees of offset of the bridges on both sides and greatly improve work efficiency.

[0008] The technical solution adopted by the present invention to solve the above-mentioned problems is: a rapid widening, connection and reinforcement structure for existing bridges, comprising two existing bridges arranged transversely side by side, a longitudinal connecting unit arranged between the two existing bridges and connected to the webs of the two existing bridges at both ends, a bridge deck pavement unit arranged on the upper surfaces of the two existing bridges, a vertical connecting unit arranged on the existing bridge and vertically penetrating the wing plate of the existing bridge and connected to the longitudinal connecting unit and the bridge deck pavement unit at both ends, and a rapid reinforcement unit arranged on the wing plate of the existing bridge and used to connect the longitudinal connecting unit and the bridge deck pavement unit; the longitudinal connecting unit comprises longitudinal steel bars whose two ends respectively penetrate the webs of the two existing bridges, the bridge deck pavement unit comprises a steel mesh arranged on the upper surfaces of the two existing bridges, the rapid reinforcement unit comprises an auxiliary calibration device arranged at the bottom of the wing plate of the existing bridge, and a reinforcement device arranged on the auxiliary calibration device, vertically penetrating the auxiliary calibration device, and connected to the longitudinal steel bars and the steel mesh at both ends.

[0009] A further preferred technical solution is that the auxiliary calibration device includes an auxiliary plate A arranged at the bottom of the wing plate of one of the existing bridges, an auxiliary plate B arranged at the bottom of the wing plate of another of the existing bridges, and at least two bolts for respectively connecting the auxiliary plate A and the auxiliary plate B to the wing plates of the two existing bridges, and the auxiliary plate A and the auxiliary plate B are a pair of special-shaped plates that are interlocked and connected.

[0010] A further preferred technical solution is that the reinforcement device includes a connecting column with an external thread on the surface and vertically passing through the auxiliary plate A and the auxiliary plate B, and the two ends of the connecting column are respectively connected to the steel mesh and the longitudinal steel bars.

[0011] A further preferred technical solution is that the reinforcement device also includes a movable ring arranged on the connecting column and threadedly connected to the connecting column, two extension rods arranged at both ends of the movable ring and extending in opposite directions, and a connecting foot arranged on the extended tail of the extension rod and used to connect to the side wall of the wing plate of the existing bridge.

[0012] A further preferred technical solution is that the auxiliary calibration device further includes a positioning ring provided at the lower end of the auxiliary plate A and screwed onto the connecting column.

[0013] A further preferred technical solution is that: the auxiliary plate A and the auxiliary plate B are both provided with a plurality of vertical slurry leakage holes.

[0014] A further preferred technical solution is that: the vertical connection unit includes a plurality of vertical anchoring steel bars; one end of the vertical anchoring steel bar is connected to the longitudinal steel bar, and the other end passes through the wing plate of the existing bridge and is connected to the steel mesh.

[0015] Another object of the present invention is to provide a construction method for rapidly widening, connecting and reinforcing an existing bridge structure, the method comprising the following steps: Preparatory work: roughening and opening holes in the existing bridge; Pre-positioning: assembling the auxiliary plate A and the auxiliary plate B, and then connecting the auxiliary plate A and the auxiliary plate B to the bottom of the two wing plates of the existing bridge respectively by bolts; or connecting the auxiliary plate A and the auxiliary plate B to the bottom of the wing plates of the existing bridge respectively, and then assembling them together; Build the structure: insert the two ends of the longitudinal steel bars into the webs of the two existing bridges, and then vertically pass the reinforcement device through the auxiliary plate A and the auxiliary plate B; rotate the multiple movable rings to stop the extension rod against the side walls of the wing plates at various heights, adjust the movable ring at the upper end of the connecting column to be flush with the upper surface of the existing bridge, install the positioning ring on the connecting column and stop it under the auxiliary plate A; lay the steel mesh on the upper surface of the existing bridge, connect the upper end of the connecting column to the steel mesh, and connect the lower end to the longitudinal steel bars; Pouring and curing: pour concrete at the designed location for splicing the two existing bridges and carry out curing. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a cross-sectional schematic diagram of the present invention; Figure 2 It is a cross-sectional schematic diagram of the present invention; Figure 3 It is a partial schematic cross-sectional view of the present invention; Figure 4 It is a top view schematic diagram of the present invention; Figure 5 It is a schematic plan view of the overall structure of the present invention.

[0017] In the figures, the meanings of the reference numerals are as follows: Existing bridge 1, longitudinal connection unit 2, bridge deck pavement unit 3, vertical connection unit 4, rapid reinforcement unit 5; Longitudinal steel bars 21, steel mesh 31, vertical anchoring steel bars 41, auxiliary calibration device 51, reinforcement device 52; Auxiliary plate A511, auxiliary plate B512, bolt 513, positioning ring 514, connecting column 521, movable ring 522, extension rod 523, connecting foot 524. DETAILED DESCRIPTION

[0018] The embodiments of the present invention are described in detail below with reference to the accompanying drawings. The following descriptions are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention.

[0019] In this specification, directional terms such as up, down, left, right, front, back, front, back, top, and bottom, which are mentioned or may be mentioned, are defined relative to the configurations shown in the accompanying drawings. The terms "inside" and "outside" refer to directions toward or away from the geometric center of a specific component, respectively. These are relative concepts and may vary depending on the location and usage of the component. Therefore, these or other directional terms should not be construed as restrictive.

[0020] As attached Figure 1-5 As shown, a rapid widening connection and reinforcement structure of an existing bridge comprises two existing bridges 1 arranged side by side in a transverse manner, a longitudinal connection unit 2 arranged between the two existing bridges 1 and connected to the webs of the two existing bridges 1 at both ends, a bridge deck pavement unit 3 arranged on the upper surfaces of the two existing bridges 1, a vertical connection unit 4 arranged on the existing bridge 1 and vertically penetrating the wing plate of the existing bridge 1 and connected to the longitudinal connection unit 2 and the bridge deck pavement unit 3 at both ends, and a vertical connection unit 4 arranged on the wing plate of the existing bridge 1 and used to connect the longitudinal connection unit The quick reinforcement unit 5 of the connecting unit 2 and the bridge deck pavement unit 3; the longitudinal connecting unit 2 includes longitudinal steel bars 21 with two ends respectively penetrating into the webs of the two existing bridges 1; the bridge deck pavement unit 3 includes a steel mesh 31 arranged on the upper surface of the two existing bridges 1, and the quick reinforcement unit 5 includes an auxiliary calibration device 51 arranged at the bottom of the wing plate of the existing bridge 1, and a reinforcement device 52 arranged on the auxiliary calibration device 51, vertically penetrating the auxiliary calibration device 51, and with two ends respectively connected to the longitudinal steel bars 21 and the steel mesh 31.

[0021] In this embodiment, the general method of using the existing bridge rapid widening connection reinforcement structure is as follows: The existing bridge rapid widening connection reinforcement structure mainly includes two existing bridges 1 arranged side by side in a transverse manner, a longitudinal connection unit 2, a bridge deck pavement unit 3, a vertical connection unit 4 and a rapid reinforcement unit 5, wherein the two ends of the longitudinal connection unit 2 are respectively connected to the opposite webs of the two existing bridges 1, the bridge deck pavement unit 3 is located on the upper surface of the two existing bridges 1, and a vertical connection unit 4 is installed between the bridge deck pavement unit 3 and the longitudinal connection unit 2 to connect the two. A rapid reinforcement unit 5 is provided between the opposite wing plates of the two existing bridges 1. By connecting the prefabricated rapid reinforcement unit 5 to the existing bridge 1, on the one hand, the relative positions of the two bridges can be pre-positioned, and on the other hand, the overall structure can be further reinforced to improve the strength of the overall structure; The longitudinal connection unit 2 specifically includes a longitudinal steel bar 21, the ends of which are respectively implanted in the webs of the two existing bridges 1. The longitudinal steel bar 21 is a whole steel bar in line with the bridge deck, which provides a stronger structural connection force and ensures the balance of the two existing bridges. The steel mesh 31 is a prefabricated steel mesh directly installed on the top of the two existing bridges 1, improving the flatness of the bridge deck of the spliced new bridge and strengthening the connection between the various parts of the structure at a lower cost. The rapid reinforcement unit 5 includes two parts, namely an auxiliary calibration device 51 and a reinforcement device 52, which realize two main functions of pre-positioning before building the structure and further reinforcing the structure after building the structure. The two sides of the auxiliary calibration device 51 are connected to the bottom of the two wing plates of the existing bridge 1, and the center passes through the reinforcement device 52. On the one hand, the reinforcement device 52 reinforces the stability of the auxiliary calibration device 51. On the other hand, its two ends are respectively connected to the longitudinal steel bars 21 located below and the steel mesh 31 located above, making the overall structure more complete and stronger.

[0022] The auxiliary calibration device 51 includes an auxiliary plate A511 arranged at the bottom of the wing plate of one of the existing bridges 1, an auxiliary plate B512 arranged at the bottom of the wing plate of another of the existing bridges 1, and at least two bolts 513 for respectively connecting the auxiliary plate A511 and the auxiliary plate B512 to the wing plates of the two existing bridges 1. The auxiliary plate A511 and the auxiliary plate B512 are a pair of special-shaped plates that are engaged with each other.

[0023] In this embodiment, the auxiliary calibration device 51 is mainly composed of two special-shaped plates that can be engaged with each other, namely auxiliary plate A511 and auxiliary plate B512. The installation ends of the two plates are respectively provided with protrusions and grooves to assist in bridge splicing, facilitating subsequent installation work; at the same time, the auxiliary plate A511 and the auxiliary plate B512 are respectively connected to the wing plates of the two existing bridges 1 through bolts 513. The connection point can be the opposite sides of the wing plates of the two existing bridges or the bottom of the wing plates of the two existing bridges, which can be flexibly set according to actual conditions.

[0024] The reinforcing device 52 includes a connecting column 521 with external threads on the surface and vertically passing through the auxiliary plate A511 and the auxiliary plate B512, and the two ends of the connecting column 521 are respectively connected to the steel mesh 31 and the longitudinal steel bar 21.

[0025] In this embodiment, based on the snap-fit splicing of the auxiliary plate A511 and the auxiliary plate B512, the connecting column 521 of the reinforcement device 52 passes through the splicing of the auxiliary plate A511 and the auxiliary plate B512, further reinforcing the connection between the two existing bridges 1 and fixing the relative positions between the bridges. In addition, the outer surface of the connecting column 521 is provided with an external thread and the upper end is connected to the steel mesh 31 located on the existing bridge 1, and the lower end is connected to the longitudinal steel bar 21 connected to the webs of the two existing bridges 1, so that the rapid reinforcement unit 5 forms a more stable whole with other structures.

[0026] The reinforcement device 52 also includes a movable ring 522 arranged on the connecting column 521 and threadedly connected to the connecting column 521, two extension rods 523 arranged at both ends of the movable ring 522 and extending in opposite directions, and a connecting foot 524 arranged on the extended tail of the extension rod 523 and used to connect to the side wall of the wing plate of the existing bridge 1.

[0027] In this embodiment, the reinforcement device 52 also includes a movable ring 522 sleeved on the connecting column 521, an extension rod 523 provided on the movable ring 522, and a connecting foot 524 located at the extended tail of the extension rod 523. The inner side of the movable ring 522 is provided with an internal thread adapted to the external thread of the connecting column 521 so that the movable ring 522 can freely move vertically on the connecting column 521. Two extension rods 523 extending in opposite directions are provided on the outer ends of the movable ring 522 to connect the two wing plates of the existing bridge 1. The two connecting feet 524 support the side walls of the wing plates connected to the two existing bridges 1. It is formed by the tail ends of two extension rods 523. The shape of the connecting foot 524 can be a rectangular block with a side length slightly larger than the diameter of the extension rod 523 to provide stronger support and connection force, or it can be a spring steel bar, which can be compressed to a certain extent and can extend into the inside of the wing side wall of the existing bridge 1; multiple groups of movable rings 522 can be set according to actual conditions. The movable ring 522 at the uppermost end should be set on the same plane flush with the upper surface of the existing bridge 1 to ensure that a certain support force is provided for the gap of the existing bridge 1, and the problem of uneven bridge surface after splicing due to excessive protrusion will not occur.

[0028] The auxiliary calibration device 51 further includes a positioning ring 514 disposed at the lower end of the auxiliary plate A511 and screwed onto the connecting column 521 .

[0029] In this embodiment, the auxiliary calibration device 51 also includes a positioning ring 514 for further stabilizing the position of the rapid reinforcement unit 5, and an internal thread adapted to the connecting column 521 is provided on the inner side thereof. When the auxiliary plate A511 and the auxiliary plate B512 are positioned, the positioning ring 514 moves to the bottom of the auxiliary plate A511 and stops on the lower surface of the auxiliary plate A511 for fixation.

[0030] A plurality of vertical slurry leakage holes are provided on the auxiliary plate A511 and the auxiliary plate B512.

[0031] In this embodiment, a plurality of grouting holes vertically penetrating the surface of the auxiliary plate A511 and the auxiliary plate B512 are opened on the surface to facilitate the subsequent pouring of concrete.

[0032] The vertical connection unit 4 includes a plurality of vertical anchoring steel bars 41 ; one end of the vertical anchoring steel bar 41 is connected to the longitudinal steel bar 21 , and the other end passes through the wing plate of the existing bridge 1 and is connected to the steel mesh 31 .

[0033] In this embodiment, the vertical connection unit 4 connected between the longitudinal connection unit 2 and the bridge deck pavement unit 3 is specifically a plurality of vertical anchor steel bars, the upper ends of which pass through the wing plates of the existing bridge 1 and are connected to the steel mesh 31 located above the bridge, and the lower ends are connected to the longitudinal steel bars 21, further strengthening the connecting force of the structure described in this application.

[0034] The above-mentioned construction method for rapidly widening, connecting and reinforcing an existing bridge structure comprises the following steps: S1: Roughening the top, end, and bottom surfaces of the existing bridge 1, and roughening the outer surface of the web of the existing bridge 1, to increase the bonding strength of the concrete poured later; vertically opening a plurality of mortise and tenon holes on the surface of the wing plate for the vertical anchoring steel bars 41 to pass through, and horizontally opening rebar holes on the side of the web plate for the longitudinal steel bars 21 to pass through; S2: Assemble the auxiliary plate A511 and the auxiliary plate B512, and then connect the auxiliary plate A511 and the auxiliary plate B512 to the bottom of the two wing plates of the existing bridge 1 respectively through bolts 513; or connect the auxiliary plate A511 and the auxiliary plate B512 to the bottom of the wing plates of the existing bridge 1 respectively, and then assemble them together; S3: Insert both ends of the longitudinal reinforcement 21 into the webs of the two existing bridges 1 placed side by side, then connect one end of the vertical anchor reinforcement 41 to the longitudinal reinforcement 21, and pass the other end through the mortise and tenon hole to be exposed above the existing bridge 1; then vertically pass the reinforcement device 52 through the auxiliary plate A511 and the auxiliary plate B512 and adjust the position of the connecting column 521 to improve the firmness of the auxiliary plate A511 and the auxiliary plate B512 after splicing; rotate the multiple movable rings 522 to stop the extension rod 523 On the side walls of the wing plates at each height, the movable ring 522 at the uppermost end of the connecting column 521 is adjusted to be flush with the upper surface of the existing bridge 1, and the positioning ring 514 is installed on the connecting column 521 and abutted against the bottom of the auxiliary plate A511; secondly, the steel mesh 31 is laid on the upper surface of the existing bridge 1, and the upper end of the connecting column 521 is connected to the steel mesh 31, and the lower end is connected to the longitudinal steel bar 21; finally, the upper end of the vertical anchor steel bar 41 is connected to the steel mesh 31, completing the construction of the entire structure; S4: pouring concrete at the position where the two existing bridges 1 are designed to be spliced to form cast-in-place flange sections and transverse concrete stiffening ribs, and pouring the concrete layer on the upper surface of the existing bridge 1 to form the bridge deck pavement unit 3, and performing maintenance according to actual project needs.

[0035] The implementation principle of a construction method for quickly widening and connecting and reinforcing an existing bridge structure in an embodiment of the present invention is: using a longitudinal connection unit 2 connected between two existing bridges 1, a bridge deck pavement unit 3 arranged on the upper surface of the existing bridge 1, a vertical connection unit 4 installed between the longitudinal connection unit 2 and the bridge deck pavement unit 3, and a rapid reinforcement unit 5 arranged in the gap between the wing plates of the existing bridge 1 and connected to the longitudinal connection unit 2 and the bridge deck pavement unit 3 to support the widening of the two existing bridges 1. Compared with traditional construction methods, the construction method of the present application uses prefabricated parts to greatly improve construction efficiency and provide a widening structure that is more stably connected to each other.

[0036] While the embodiments of the present invention have been described in detail above with reference to the accompanying drawings, the present invention is not limited to the aforementioned embodiments. Various modifications are possible within the scope of knowledge possessed by a person skilled in the art without departing from the spirit of the present invention. These modifications are non-inventive and are protected by patent law as long as they fall within the scope of the claims of the present invention.

Claims

1. A rapid widening, connection and reinforcement structure for an existing bridge, characterized by: The invention comprises two existing bridges (1) arranged side by side in a transverse direction, a longitudinal connecting unit (2) arranged between the two existing bridges (1) and having two ends respectively connected to the webs of the two existing bridges (1), a bridge deck pavement unit (3) arranged on the upper surfaces of the two existing bridges (1), a vertical connecting unit (4) arranged on the existing bridge (1) and vertically penetrating the wing plate of the existing bridge (1) and having two ends respectively connected to the longitudinal connecting unit (2) and the bridge deck pavement unit (3), and a connecting unit (5) arranged on the wing plate of the existing bridge (1) and used to connect the longitudinal connecting unit (2) and the bridge deck pavement unit (3) a rapid reinforcement unit (5); the longitudinal connection unit (2) includes longitudinal steel bars (21) with two ends respectively penetrating the webs of the two existing bridges (1); the bridge deck pavement unit (3) includes a steel mesh (31) arranged on the upper surface of the two existing bridges (1); the rapid reinforcement unit (5) includes an auxiliary calibration device (51) arranged at the bottom of the wing plate of the existing bridge (1); and a reinforcement device (52) arranged on the auxiliary calibration device (51), vertically penetrating the auxiliary calibration device (51), and having two ends respectively connected to the longitudinal steel bars (21) and the steel mesh (31).

2. The rapid widening, connection and reinforcement structure for an existing bridge according to claim 1, characterized in that: The auxiliary calibration device (51) includes an auxiliary plate A (511) arranged at the bottom of a wing plate of one of the existing bridges (1), an auxiliary plate B (512) arranged at the bottom of a wing plate of another of the existing bridges (1), and at least two bolts (513) for connecting the auxiliary plate A (511) and the auxiliary plate B (512) to the wing plates of the two existing bridges (1), respectively. The auxiliary plate A (511) and the auxiliary plate B (512) are a pair of special-shaped plates that are engaged with each other.

3. The rapid widening, connection and reinforcement structure for an existing bridge according to claim 2, characterized in that: The reinforcing device (52) comprises a connecting column (521) having an external thread on its surface and vertically penetrating the auxiliary plate A (511) and the auxiliary plate B (512), and two ends of the connecting column (521) are respectively connected to the steel mesh (31) and the longitudinal steel bars (21).

4. The rapid widening, connection and reinforcement structure for an existing bridge according to claim 3 is characterized by: The reinforcement device (52) further includes a movable ring (522) disposed on the connecting column (521) and threadedly connected to the connecting column (521), two extension rods (523) disposed at both ends of the movable ring (522) and extending in opposite directions, and a connecting foot (524) disposed on the extended tail of the extension rod (523) and used for connecting to the wing plate side wall of the existing bridge (1).

5. The rapid widening, connection and reinforcement structure for an existing bridge according to claim 4 is characterized in that: The auxiliary calibration device (51) further includes a positioning ring (514) provided at the lower end of the auxiliary plate A (511) and screwed onto the connecting column (521).

6. The rapid widening, connection and reinforcement structure for an existing bridge according to any one of claims 2 to 5, characterized in that: A plurality of vertical slurry leakage holes are provided on both the auxiliary plate A (511) and the auxiliary plate B (512).

7. The rapid widening, connection and reinforcement structure for an existing bridge according to claim 1 is characterized in that: The vertical connection unit (4) comprises a plurality of vertical anchoring steel bars (41); one end of the vertical anchoring steel bar (41) is connected to the longitudinal steel bar (21), and the other end passes through the wing plate of the existing bridge (1) and is connected to the steel mesh (31).

8. The construction method for rapidly widening, connecting and reinforcing an existing bridge as claimed in claim 6, characterized in that: The method comprises the following steps: Preparation work: roughening and drilling holes in the existing bridge (1); Pre-positioning: the auxiliary plate A (511) and the auxiliary plate B (512) are assembled together, and then the auxiliary plate A (511) and the auxiliary plate B (512) are respectively connected to the bottom of the two wing plates of the existing bridge (1) by bolts (513); or the auxiliary plate A (511) and the auxiliary plate B (512) are respectively connected to the bottom of the wing plate of the existing bridge (1), and then assembled together; Building the structure: inserting both ends of the longitudinal reinforcement (21) into the webs of the two existing bridges (1), and then vertically passing the reinforcement device (52) through the auxiliary plate A (511) and the auxiliary plate B (512); rotating the plurality of movable rings (522) to stop the extension rod (523) against the side walls of the wing plates at various heights, adjusting the movable ring (522) at the uppermost end of the connecting column (521) to be flush with the upper surface of the existing bridge (1), installing the positioning ring (514) on the connecting column (521) and stopping it below the auxiliary plate A (511); paving the steel mesh (31) on the upper surface of the existing bridge (1), connecting the upper end of the connecting column (521) to the steel mesh (31), and connecting the lower end to the longitudinal reinforcement (21); Casting and curing: Cast concrete at the location where the two existing bridges (1) are designed to be spliced and curing.

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