Bridge expansion device for bridge construction

Abstract

The invention discloses a bridge expansion device for bridge construction, and belongs to the technical field of bridge construction, the bridge expansion device comprises two symmetrically arranged boundary beams and a plurality of anchoring ribs fixed on one sides of the boundary beams, two connecting pieces are fixed on the outer walls of one sides of the boundary beams, and supporting columns are movably connected in the connecting pieces; fixing sleeves are movably connected to the exteriors of the supporting columns, reinforcing parts are fixed to the outer walls of one sides of the edge beams, supporting plates are installed on the surfaces of the reinforcing parts, supporting boxes are movably connected to the surfaces of the supporting plates, supporting frames are fixed in the supporting boxes, and protection plates are movably connected to the surfaces of the supporting frames; a supporting block is fixed to the bottom of the protection plate, a threaded rod is rotationally connected into the supporting box, and the outer wall of the threaded rod is in threaded connection with a push block. The bridge expansion and contraction device for bridge construction is convenient to contract along with deformation of a bridge, meanwhile, the protection plates are convenient to replace, and later maintenance is more convenient.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge construction, and in particular relates to a bridge expansion device used for bridge construction. Background Art

[0002] A bridge generally refers to a structure built across rivers, lakes, or seas to facilitate the smooth passage of vehicles and pedestrians. To adapt to the rapidly developing modern transportation industry, bridges have also been extended to encompass structures built across mountain streams, over unfavorable geology, or to meet other transportation needs, making passage more convenient. They are widely used in modern society. With the rapid development of my country's economy, the pace of urbanization and industrialization has significantly accelerated, leading to a significant increase in the scale and number of road and bridge projects. As a foundational project for my country's national economic development, bridge engineering has a significant impact on the development of the national economy. In recent years, as people's living standards have gradually improved and their travel options have expanded, the quality requirements for bridge construction have also become increasingly stringent.

[0003] During bridge construction, expansion joints are installed between two joined sections to maintain bridge strength while also accommodating thermal expansion and contraction. These joints are typically installed between beam ends, between beam ends and abutments, or at hinged joints to accommodate bridge deck deformation. Existing expansion joints are often exposed to the road, where vehicles run over them, which can easily damage them. Furthermore, most expansion joints are fixed in place, making them difficult to replace and hindering vehicle operation. Summary of the Invention

[0004] The purpose of the present invention is to provide a bridge expansion device for bridge construction, so as to solve the problem that the expansion devices proposed in the above background technology are mostly installed in a fixed manner. When they are damaged, they are not only laborious to replace, but also affect vehicle driving.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solution: a bridge expansion device for bridge construction, comprising two symmetrically arranged side beams and a plurality of anchor bars fixed to one side of the side beams, two connecting members fixed to the outer wall of one side of the side beams, a support column movably connected to the inner part of the connecting member, a fixed sleeve movably connected to the outer part of the support column, a reinforcement member fixed to the outer wall of one side of the side beam, and a support plate mounted on the surface of the reinforcement member;

[0006] The surface of the support plate is movably connected to a support box, a support frame is fixed in the support box, and a protective plate is movably connected to the surface of the support frame, a support block is fixed to the bottom of the protective plate, a through hole is opened on one side outer wall of the support box, and a threaded rod is rotatably connected in the through hole of the support box, and a push block for pushing the support block to move is threadedly connected to the outer wall of the threaded rod;

[0007] Guide plates are fixed on the opposite surfaces of the two side beams, and movable grooves for the guide plates to move are provided on the outer walls of both sides of the support box. A discharge groove is provided on the surface of the support plate, and two sets of rotating grooves are provided on the surface of the protective plate, and speed bumps are rotatably connected in the two sets of rotating grooves on the surface of the protective plate.

[0008] In a further embodiment, two connecting columns fixedly connected to the speed bump are rotatably connected to the inner walls on both sides of the support box, and a sprocket is fixed to the outer wall of the connecting column on one side of the speed bump.

[0009] In a further embodiment, a chain is sleeved on the outside of the two sprockets, and a turntable 2 is fixed to the end surface of one of the connecting columns located outside the support box.

[0010] In a further embodiment, a limiting slider movably connected to the fixing sleeve is fixed to the end surface of the support column located inside the fixing sleeve, and a supporting spring is provided between the two limiting sliders.

[0011] In a further embodiment, a plurality of threaded holes are provided at corresponding positions of the reinforcement member and the support plate, and fixing bolts are threadedly connected in the threaded holes of the reinforcement member and the support plate.

[0012] In a further embodiment, two dovetail sliders are symmetrically fixed on the surface of the support plate, and a plurality of dovetail sliding grooves for the dovetail sliders to slide are provided on the bottom of the support box.

[0013] In a further embodiment, a turntable 1 is fixed to the end surface of the threaded rod located outside the support box, and a limit block for limiting the position of the push block is fixed to the bottom wall of the inner cavity of the support box.

[0014] In a further embodiment, threaded holes are also provided at corresponding positions of the connecting member and the support column, and positioning bolts are threadedly connected to the threaded holes of the connecting member and the support column.

[0015] Technical effects and advantages of the present invention:

[0016] 1. This bridge telescopic device used for bridge construction can drive the threaded rod to rotate through the turntable, thereby driving the push block to move in the support box. When the protective plate is damaged, the support block and the protective plate are pushed up, and the protective plate is lifted out of the support box, which facilitates the replacement of the protective plate and saves time and effort during the maintenance process.

[0017] 2. By arranging a speed bump in the support box, in case of an emergency, the connecting column and the speed bump can be driven to rotate by the second turntable, and the arc-shaped surface of the speed bump can be rotated to the top of the protective plate, so that a speed reduction structure is formed on the device, which can reduce the vehicle speed, ensure driving safety in an emergency, and provide buffer time for the subsequent emergency handling. At the same time, the rotatable speed bump, under normal circumstances, the plane of the speed bump and the upper surface of the protective plate are on the same horizontal plane, which can ensure the stability of the vehicle during driving.

[0018] 3. When stones and other solid waste on the road fall on the support plate, the guide plate can make the stones and other solid waste slide quickly into the support box and be quickly discharged through the discharge chute on the support plate, so as to avoid the stones and other solid waste being stuck between the side beam and the support box, affecting the normal expansion and contraction of the telescopic device. At the same time, it can also play a role in diverting rainwater, allowing the support plate to dry quickly, and avoiding long-term accumulation of rainwater, which may cause rust on the support plate.

[0019] 4. The support column is movably connected to the side beam through the connecting piece, the support plate is movably connected to the reinforcement piece through the fixing bolt, and the support plate is movably connected to the support box through the dovetail slider. All components are detachable, which is not only convenient for disassembly and assembly, but also for later maintenance. At the same time, during transportation, each component can be transported separately, which saves more space and is more convenient for transportation.

[0020] During the deformation and contraction of the bridge, the support column moves in the fixed sleeve and the support plate moves at the bottom of the support box, so that the device can contract as the bridge deforms, keep the main beam stable, and thus ensure the stability of the bridge. The bridge expansion and contraction device used for bridge construction is convenient for contraction as the bridge deforms, and at the same time it is convenient to replace the protective plate, which is more convenient for later maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 It is a structural schematic diagram of the present invention;

[0023] Figure 2 This is a schematic structural diagram of the present invention in a state without a support box;

[0024] Figure 3 It is a structural schematic diagram of the support column and the fixing sleeve of the present invention;

[0025] Figure 4 It is a schematic structural diagram of the support column and the fixing sleeve of the present invention in a cutaway state;

[0026] Figure 5 It is a structural schematic diagram of the support plate of the present invention;

[0027] Figure 6 It is a structural schematic diagram of the support box of the present invention in a cutaway state;

[0028] Figure 7 It is a structural schematic diagram of the speed bump of the present invention;

[0029] Figure 8 For the present invention Figure 7 Enlarged view of point A in the middle.

[0030] In the figure: 1. Side beam; 2. Anchor reinforcement; 3. Connecting piece; 4. Support column; 5. Limiting slider; 6. Fixing sleeve; 7. Support spring; 8. Reinforcement piece; 9. Support plate; 10. Fixing bolt; 11. Dovetail slider; 12. Support box; 13. Support frame; 14. Protective plate; 15. Support block; 16. Threaded rod; 17. Push block; 18. Turntable 1; 19. Limiting block; 20. Positioning bolt; 21. Guide plate; 22. Connecting column; 23. Speed ​​bump; 24. Sprocket; 25. Chain; 26. Turntable 2. DETAILED DESCRIPTION

[0031] In the following description, numerous specific details are provided to provide a more thorough understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention may be practiced without one or more of these details. In other instances, certain technical features well known in the art are not described to avoid confusion with the present invention.

[0032] Unless otherwise defined, the directions of up, down, left, right, front, back, inside and outside involved in this document are based on the directions of up, down, left, right, front, back, inside and outside shown in the figures of the present invention, and are explained here together.

[0033] The present invention provides Figure 1-8 The bridge expansion device shown is used for bridge construction, including two symmetrically arranged side beams 1 and multiple anchor bars 2 fixed to one side of the side beams 1. The anchor bars 2 are cast together with the main beam of the bridge to ensure the stability of the device during operation.

[0034] Two connecting parts 3 are welded to the outer wall of one side of the side beam 1, and a support column 4 is movably connected inside the connecting part 3. Threaded holes are provided at corresponding positions of the connecting part 3 and the support column 4, and positioning bolts 20 are threadedly connected to the threaded holes of the connecting part 3 and the support column 4. Screwing the positioning bolts 20 into the threaded holes of the connecting part 3 and the support column 4 can ensure a stable connection between the connecting part 3 and the support column 4. Unscrewing the positioning bolts 20 can facilitate the removal of the support column 4 from the connecting part 3, thereby facilitating the disassembly and assembly of the support column 4.

[0035] The outside of the support column 4 is movably connected with a fixed sleeve 6. The end surface of the support column 4 located inside the fixed sleeve 6 is welded with a limit slider 5 movably connected to the fixed sleeve 6. The limit slider 5 can limit the position of the support column 4 to prevent the support column 4 from slipping off the fixed sleeve 6. A support spring 7 is provided between the two limit sliders 5. The support spring 7 is located in the fixed sleeve 6. The fixed sleeve 6 can fully protect the support spring 7 to prevent rain, dust, etc. from corroding the support spring 7 and causing the support spring 7 to rust, thereby ensuring the service life of the support spring 7.

[0036] A reinforcement 8 is welded to the outer wall of one side of the side beam 1, and a support plate 9 is installed on the surface of the reinforcement 8. The reinforcement 8 is movably connected to the support plate 9. A plurality of threaded holes are provided at the corresponding positions of the reinforcement 8 and the support plate 9, and the threaded holes of the reinforcement 8 and the support plate 9 are threadedly connected with fixing bolts 10. The fixing bolts 10 can stably connect the reinforcement 8 and the support plate 9, and it is also convenient to remove the support plate 9 from the reinforcement 8. The surface of the support plate 9 is movably connected with a support box 12. Two dovetail sliders 11 are symmetrically welded on the surface of the support plate 9. The bottom of the support box 12 is opened. A plurality of dovetail slides 11 are provided for the sliding of dovetail sliders. The dovetail sliders 11 slide in the dovetail slides at the bottom of the support box 12, so that the support box 12 can only move horizontally on the surface of the support plate 9. While ensuring a stable connection between the support plate 9 and the support box 12, it also facilitates the movement of the support box 12 on the surface of the support plate 9. During the deformation and contraction of the bridge, the support column 4 moves in the fixed sleeve 6, and the support plate 9 moves at the bottom of the support box 12, so that the device can contract with the deformation of the bridge, keep the main beam stable, and thus ensure the stability of the bridge.

[0037] The support column 4 is movably connected to the side beam 1 through the connecting piece 3, the support plate 9 is movably connected to the reinforcement member 8 through the fixing bolt 10, and the support plate 9 is movably connected to the support box 12 through the dovetail slider 11. All components are detachable, which is not only convenient for disassembly and assembly, but also convenient for later maintenance. At the same time, during transportation, each component can be transported separately, which saves more space and is more convenient for transportation.

[0038] A support frame 13 is welded inside the support box 12, and a protective plate 14 is movably connected to the surface of the support frame 13. The protective plate 14 is movably connected to the support box 12. A support block 15 is welded to the bottom of the protective plate 14. A through hole is opened on the outer wall of one side of the support box 12, and a threaded rod 16 is rotatably connected to the through hole of the support box 12 through a welded bearing. The outer wall of the threaded rod 16 is threadedly connected to a push block 17 for pushing the support block 15 to move. At the same time, the support block 15 and the push block 17 can support the protective plate 14, further ensuring the stability of the protective plate 14. The opposite surfaces of the support block 15 and the push block 17 are inclined surfaces, which facilitates the push block 17 to push the support block 15 upward;

[0039] The end surface of the threaded rod 16 located outside the support box 12 is welded with a turntable 18, and a threaded hole is also provided on the turntable 18. The threaded hole of the turntable 18 is connected with a locking bolt. Tightening the locking bolt can fix the position of the turntable 18 to prevent the turntable 18 from rotating accidentally. The bottom wall of the inner cavity of the support box 12 is welded with a limit block 19 for limiting the position of the push block 17. After the push block 17 contacts the limit block 19, the position of the push block 17 can be limited to prevent the push block 17 from separating from the support block 15. The turntable 18 drives the threaded rod 16 to rotate, The push block 17 is driven to move in the support box 12. After the protective plate 14 is damaged, the support block 15 and the protective plate 14 are pushed up, and the protective plate 14 is lifted up from the support box 12, which is convenient for replacing the protective plate 14. The maintenance process is more time-saving and labor-saving. After the protective plate 14 is replaced, the turntable 18 rotates in the opposite direction, driving the push block 17 to reset. The protective plate 14 automatically moves downward to the surface of the support frame 13 under the action of gravity. The support of the support frame 13, the support block 15 and the push block 17 ensures the stability of the protective plate 14 during the driving of the vehicle.

[0040] Guide plates 21 are welded and fixed to the opposite surfaces of the two side beams 1, and the guide plates 21 extend into the support box 12. The surface of the guide plates 21 is an inclined surface, and the inclination angle of the surface of the guide plates 21 can be set according to actual use requirements, and the surface of the guide plates 21 is a smooth plane to prevent fixed garbage from staying on the surface of the guide plates 21. Moving grooves for the guide plates 21 to move are provided on the outer walls of both sides of the support box 12. The upper end of the moving groove is higher than the highest point of the guide plates 21, which is convenient for the guide plates 21 to move in the moving groove of the support box 12, and also convenient for solid garbage to slide from the surface of the guide plates 21 to the moving groove of the support box 12. A discharge trough is provided on the surface of the support plate 9, and the size of the discharge trough on the surface of the support plate 9 can be set according to actual use requirements. During the expansion and contraction of the bridge, the position of the end face of the guide plate 21 is always within the coverage range of the discharge trough on the surface of the support plate 9, thereby preventing the solid garbage from being unable to be discharged through the discharge trough on the surface of the support plate 9 due to the separation of the guide plate 21 from the discharge trough on the surface of the support plate 9, causing the solid garbage to accumulate in the support box 12. When solid garbage such as stones on the road falls on the support plate 9, the setting of the guide plate 21 can make the stones and other solid garbage quickly slide into the support box 12 and be quickly discharged through the discharge trough on the support plate 9, avoiding the stones and other solid garbage from being stuck between the side beam 1 and the support box 12, affecting the normal expansion and contraction of the expansion device. At the same time, it can also play a role in diverting rainwater, allowing the support plate 9 to dry quickly, and avoiding rainwater accumulation for a long time, causing the support plate 9 to rust.

[0041] The surface of the protective plate 14 is provided with two sets of rotation grooves, and the two sets of rotation grooves on the surface of the protective plate 14 are rotatably connected with speed bumps 23. The width of the two sets of rotation grooves on the surface of the protective plate 14 is greater than the width of the speed bumps 23, so that the speed bumps 23 can rotate in the rotation grooves on the surface of the protective plate 14. The protective plate 14 is movably connected to the speed bumps 23. During the process of disassembling and assembling the protective plate 14, the speed bumps 23 will not restrict the disassembly and assembly of the protective plate 14. A plurality of diversion holes are provided on the bottom plate of the support box 12. When it rains or snows, rainwater and the like can pass through the protective plate 14. 14 surface of the rotating groove into the support box 12, and then through the guide hole on the bottom plate of the support box 12 out of the support box 12, to prevent rainwater from remaining in the support box 12, causing the support box 12 to rust, etc. At the same time, according to actual use, a sealing strip can be placed in the gap between the protective plate 14 and the speed bump 23 to prevent rainwater from flowing into the support box 12 from the rotating groove on the surface of the protective plate 14, and to prevent solid particles such as stones from falling into the gap between the protective plate 14 and the speed bump 23, affecting the normal rotation of the speed bump 23;

[0042] The inner walls of both sides of the support box 12 are rotatably connected to two connecting columns 22 fixedly connected to the speed reduction belt 23 through welded bearings. The connecting columns 22 extend into the speed reduction belt 23 to ensure the stability of the connection between the connecting columns 22 and the speed reduction belt 23. The center point of the connecting column 22 is not at the same height as the center point of the speed reduction belt 23. A sprocket 24 is welded to the outer wall of the connecting column 22 on one side of the speed reduction belt 23. The two sprockets 24 are of the same size. A chain 25 is sleeved on the outside of the two sprockets 24. The chain 25 can drive the two sprockets 24 to rotate at the same time, thereby driving the connecting column 22 and the two speed reduction belts 23 to rotate at the same time. A turntable 26 is welded on the end face of one connecting column 22 located on the outside of the support box 12. A threaded hole is also provided on the turntable 26, and the turntable 26 has a threaded hole. A locking bolt is threadedly connected in the threaded hole. Tightening the locking bolt can fix the position of the turntable 26 to prevent the turntable 26 from rotating accidentally, thereby ensuring the stability of the speed bump 23 in the support box 12. By arranging the speed bump 23 in the support box 12, in an emergency, the turntable 26 can be used to drive the connecting column 22 and the speed bump 23 to rotate, and the arcuate surface of the speed bump 23 can be rotated to the top of the protective plate 14, so that a deceleration structure is formed on the device, which can reduce the vehicle speed and ensure driving safety in an emergency, providing buffer time for subsequent emergency handling. At the same time, the rotatable speed bump 23, under normal circumstances, the plane of the speed bump 23 and the upper surface of the protective plate 14 are on the same horizontal plane, which can ensure the stability of the vehicle during driving.

[0043] The standard parts used in the present invention can all be purchased from the market, and special-shaped parts can be customized according to the description in the specification and the drawings. The specific connection methods of each part adopt conventional means such as mature bolts, rivets, welding, etc. in the existing technology. The machinery, parts and equipment all adopt conventional models in the existing technology, and the circuit connection adopts the conventional connection method in the existing technology, which will not be described in detail here. The control method of the present invention is controlled by a controller, and the control circuit of the controller can be implemented by simple programming by technicians in this field. The content not described in detail in this specification belongs to the existing technology known to professional and technical personnel in this field.

[0044] In the description of the present invention, it should be understood that the indicated orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0045] Working principle:

[0046] When the bridge expansion and contraction device is used, the anchor bar 2 is connected to the main beam of the bridge and cast and fixed. During the deformation and contraction of the bridge, the support column 4 moves in the fixed sleeve 6, and the support plate 9 moves at the bottom of the support box 12, so that the device can contract with the deformation of the bridge and keep the main beam stable.

[0047] When the guard plate 14 is damaged and needs to be replaced, the threaded rod 16 is driven to rotate by the turntable 18, thereby driving the push block 17 to move in the support box 12, pushing the support block 15 and the guard plate 14 to rise, and the guard plate 14 is lifted up from the support box 12, and the damaged guard plate 14 is taken out of the support box 12, and a new guard plate 14 is replaced. The turntable 18 is rotated in the opposite direction, and the push block 17 moves in the opposite direction. Under the action of gravity, the guard plate 14 drops to the surface of the support frame 13, and the replacement of the guard plate 14 is completed. The maintenance process is more time-saving and labor-saving. At the same time, the support of the support frame 13, the support block 15 and the push block 17 ensure the stability of the guard plate 14 during the driving of the vehicle.

[0048] When stones and other solid waste fall between the side beam 1 and the support box 12 on the road, the surface of the guide plate 21 is an inclined surface, so that the stones and other solid waste slide quickly into the support box 12 and are quickly discharged through the discharge chute on the support plate 9, thereby preventing the stones and other solid waste from being stuck between the side beam 1 and the support box 12 and affecting the normal extension and contraction of the telescopic device. At the same time, the guide plate 21 with an inclined surface can also play a role in draining rainwater, allowing the support plate 9 to dry quickly, thereby preventing rainwater from accumulating for a long time and causing the support plate 9 to rust.

[0049] In case of an emergency, the connecting column 22 and the sprocket 24 can be driven to rotate by the turntable 26, and the two sprockets 24 are connected by the chain 25, thereby driving the two speed bumps 23 to rotate at the same time. Since the center point of the connecting column 22 and the center point of the speed bump 23 are not at the same height, the arc surface of the speed bump 23 can be rotated to the top of the guard plate 14 by rotating the connecting column 22, so that a speed reduction structure is formed on the device, which can reduce the vehicle speed, ensure driving safety in an emergency, and provide buffer time for subsequent emergency handling. When the emergency is handled, the turntable 26 is rotated in the opposite direction to reset the speed bump 23 so that the plane of the speed bump 23 is on the same horizontal plane as the upper surface of the guard plate 14, ensuring the stability of the vehicle during driving. When the position of the speed bump 23 is adjusted, the locking bolt on the turntable 26 is tightened to fix the position of the turntable 26, thereby fixing the position of the speed bump 23 and ensuring the stability of the speed bump 23.

[0050] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A bridge expansion device for bridge construction, comprising two symmetrically arranged side beams (1) and a plurality of anchor bars (2) fixed to one side of the side beams (1), characterized in that: Two connecting members (3) are fixed to the outer wall of one side of the side beam (1); a support column (4) is movably connected to the inner side of the connecting member (3); a fixed sleeve (6) is movably connected to the outer side of the support column (4); a reinforcement member (8) is fixed to the outer wall of one side of the side beam (1), and a support plate (9) is installed on the surface of the reinforcement member (8); The surface of the support plate (9) is movably connected to a support box (12), a support frame (13) is fixed in the support box (12), and a protective plate (14) is movably connected to the surface of the support frame (13), a support block (15) is fixed at the bottom of the protective plate (14), a through hole is opened on one side outer wall of the support box (12), and a threaded rod (16) is rotatably connected in the through hole of the support box (12), and a push block (17) for pushing the support block (15) to move is threadedly connected to the outer wall of the threaded rod (16); Guide plates (21) are fixed to the opposite surfaces of the two side beams (1), and movable grooves for the guide plates (21) to move are provided on the outer walls of both sides of the support box (12). A discharge groove is provided on the surface of the support plate (9), and two groups of rotating grooves are provided on the surface of the protective plate (14), and speed reduction belts (23) are rotatably connected in the two groups of rotating grooves on the surface of the protective plate (14).

2. The bridge expansion device for bridge construction according to claim 1, characterized in that: The inner walls on both sides of the support box (12) are rotatably connected to two connecting columns (22) fixedly connected to the speed reduction belt (23), and a sprocket (24) is fixed to the outer wall of the connecting column (22) on one side of the speed reduction belt (23).

3. The bridge expansion device for bridge construction according to claim 2, characterized in that: The outer portions of the two sprockets (24) are sleeved with chains (25), and a second turntable (26) is fixed to the end surface of one of the connecting columns (22) located outside the support box (12).

4. The bridge expansion device for bridge construction according to claim 1, characterized in that: A limiting slider (5) movably connected to the fixing sleeve (6) is fixed to the end surface of the support column (4) located inside the fixing sleeve (6), and a supporting spring (7) is provided between the two limiting sliders (5).

5. The bridge expansion device for bridge construction according to claim 1, characterized in that: A plurality of threaded holes are provided at corresponding positions of the reinforcement member (8) and the support plate (9), and fixing bolts (10) are threadedly connected in the threaded holes of the reinforcement member (8) and the support plate (9).

6. The bridge expansion device for bridge construction according to claim 5, characterized in that: Two dovetail sliders (11) are symmetrically fixed on the surface of the support plate (9), and a plurality of dovetail sliding grooves for the dovetail sliders (11) to slide are provided at the bottom of the support box (12).

7. The bridge expansion device for bridge construction according to claim 1, characterized in that: A turntable 1 (18) is fixed to the end surface of the threaded rod (16) located outside the support box (12), and a limit block (19) for limiting the position of the push block (17) is fixed to the bottom wall of the inner cavity of the support box (12).

8. The bridge expansion device for bridge construction according to claim 1, characterized in that: Threaded holes are also provided at corresponding positions of the connecting member (3) and the supporting column (4), and positioning bolts (20) are threadedly connected in the threaded holes of the connecting member (3) and the supporting column (4).

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