Quick disassembly and assembly application method of assembly type bridge expansion device

Abstract

The invention relates to a quick dismounting and mounting application method of a fabricated bridge expansion device, which comprises the following steps of: mounting an L-shaped steel plate at a bridge notch on a newly built bridge; when the telescopic device is maintained, if an L-shaped steel plate is arranged at a notch of a bridge, concrete in a U-shaped groove is chiseled away at a bolt of the U-shaped groove of an original telescopic device, the bolt is exposed, the bolt is detached, and the original telescopic device is hoisted; if the notch of the bridge is not provided with the L-shaped steel plate, concrete at the notch is chiseled away, an original telescopic device is lifted and moved out of the notch, and the L-shaped steel plate is installed in the notch; then the U-shaped groove of the new telescopic device is placed on the L-shaped steel plate at the notch, and the bolt penetrates through the U-shaped groove and is in threaded connection with the connecting pipe; and concrete is poured into the U-shaped groove, and after the concrete is cured, the formwork is dismantled, and traffic is opened. Therefore, the replacement efficiency can be improved, the maintenance time of newly poured concrete in the later period is prolonged, the strength and elasticity modulus of the concrete in the notch are improved, the anchoring performance of the telescopic device is improved, and the service life of the telescopic device is prolonged.

Description

Technical Field

[0001] The present invention belongs to the field of bridge engineering, and in particular, relates to a method for quickly disassembling and assembling an assembled bridge expansion device. Background Art

[0002] As an important transportation infrastructure, the stability and durability of bridges are crucial to traffic safety. When a bridge is subjected to vehicle loads and environmental factors, the bridge structure will deform. To adapt to this deformation, expansion joints are usually reserved in the bridge design. The existence of expansion joints is to allow the bridge structure to expand and contract freely under factors such as temperature changes and loads to avoid structural damage.

[0003] The expansion joints installed at the expansion joints are one of the key components for the normal operation of the bridge. However, due to the long-term and repeated impact of vehicle loads, the concrete of the expansion joints and their anchorage areas may crack and the steel bars may corrode, causing the expansion joints to fail and need to be replaced.

[0004] In the existing technology, when a bridge expansion device needs to be replaced, a series of cumbersome and time-consuming steps are usually adopted, usually including first locating the damaged repair area, then using a cutter to cut the concrete, and using a jackhammer to chisel out the concrete in the anchor area. However, in sections with heavy traffic, due to the time limit of traffic control, the time-consuming nature of these steps has put tremendous pressure on subsequent work. Especially when dismantling the old expansion device, due to the high strength of the concrete in the expansion joint anchor area and the complexity of the internal steel bars, the manual chiseling process is not only time-consuming, but also difficult to ensure the construction quality.

[0005] Although there is a method of using fast-hardening concrete to repair expansion joints, which can achieve certain strength requirements in a short time, its elastic modulus has not yet reached expectations, that is, its ability to resist deformation due to external forces has not yet met the use requirements. This results in the concrete being easily deformed or cracked due to external forces after the repaired expansion joint is put into use, which seriously affects the service life and safety of the bridge expansion joint.

[0006] Therefore, how to improve the anchoring performance and maintenance and replacement efficiency of bridge expansion devices while ensuring construction quality has become an urgent problem to be solved in the current expansion joint maintenance field. Summary of the invention

[0007] In order to solve the above problems, the present invention aims to provide a fast and efficient method for replacing a bridge expansion device, so as to shorten the construction time and increase the curing time of the newly poured concrete at a later stage.

[0008] The method for quickly disassembling and assembling the assembled bridge expansion device comprises the following steps:

[0009] S1. On newly built bridges, L-shaped steel plates are pre-buried at the notches of bridge expansion joints;

[0010] When repairing the expansion joint, if there is an L-shaped steel plate at the expansion joint notch of the bridge, then at the bolts of the U-shaped groove of the original expansion joint, the concrete in the U-shaped groove is chiseled off to expose the bolts, the bolts are removed, the original expansion joint is lifted to expose the L-shaped steel plate; if there is no L-shaped steel plate at the expansion joint notch of the bridge, the concrete at the expansion joint notch is chiseled off, the original expansion joint is lifted and moved out of the notch, and then the L-shaped steel plate is installed in the expansion joint notch;

[0011] S2. Lift the new telescopic device, place the U-shaped groove of the new telescopic device on the L-shaped steel plate at the notch of the expansion joint, and use bolts to pass through the U-shaped groove and connect it to the connecting pipe thread;

[0012] S3. If there are side plates at both ends of the U-shaped groove, pour concrete into the U-shaped groove; if there are no side plates, install the side formwork and then pour concrete into the U-shaped groove;

[0013] S4. After the concrete is cured, traffic is opened.

[0014] If an L-shaped steel plate is pre-buried at the expansion joint notch of a newly cast bridge, the new expansion device can be directly installed on the L-shaped steel plate;

[0015] When the expansion device needs to be replaced, if there is no L-shaped steel plate at the expansion joint slot of the bridge, the original expansion device in the expansion joint slot is first removed, and then the L-shaped steel plate is installed at the expansion joint slot of the bridge, and a new expansion device is installed; if there is an L-shaped steel plate at the expansion joint slot of the bridge, it is only necessary to chisel out the concrete at the bolt, separate the bolt from the L-shaped steel plate, and place the new expansion device on the L-shaped steel plate, connect the bolt with the connecting pipe thread, and pour concrete, and the expansion device can be installed or disassembled and replaced, thereby improving the installation or replacement efficiency, shortening the replacement time of the expansion device under the condition of a certain traffic control time during the construction period, extending the maintenance time of the newly poured concrete in the later stage, and improving the strength and elastic modulus of the concrete in the slot;

[0016] In addition, when chiseling away the concrete, the L-shaped steel plate is used to protect the notch, which enhances the stiffness of the expansion joint notch and avoids damage to the bridge deck or abutment back wall at the notch caused by repeated chiseling away of concrete at the notch when replacing the expansion device. This enhances the anchoring performance of the expansion device and extends its service life.

[0017] In a specific possible implementation scheme, the connecting pipes are respectively arranged on the side wall and the bottom wall of the L-shaped steel plate, and the connecting pipe and the L-shaped steel plate are both buried in the bridge.

[0018] In a specific possible implementation, in step S1, when chiseling concrete, chiseling is performed according to the marking portion. The marking portion marks the position of the connecting pipe, thereby improving the convenience of chiseling concrete.

[0019] In a specific possible implementation method, in step S3, if there is no panel on the U-shaped groove of the new telescopic device, a panel is installed on the top wall of the U-shaped groove, one side of the panel is connected to the side beam of the telescopic device, and the other side is connected to the side of the U-shaped groove. The panel is used to pull the side beam of the telescopic device and the side plate of the U-shaped groove, so as to avoid deformation of the side plate due to vehicle impact.

[0020] In a specific possible implementation manner, the panel is provided with friction lines, or the panel is provided with a plurality of exhaust holes.

[0021] By using friction patterns or exhaust holes, the stability of the vehicle when driving on the telescopic device panel can be enhanced, effectively preventing the occurrence of slipping and improving driving safety;

[0022] During the concrete pouring process, multiple exhaust holes are set to allow excess air to be discharged smoothly, ensuring that the concrete is evenly poured and densely filled in the U-shaped groove, thereby ensuring the project quality and structural strength.

[0023] Furthermore, the connecting pipe is below the exhaust hole.

[0024] By setting the connecting pipe below the exhaust hole, not only can the position of the connecting pipe be intuitively marked, allowing workers to quickly and accurately locate the connecting pipe, thereby improving work efficiency; at the same time, multiple exhaust holes can also allow workers to easily chisel away concrete, greatly simplifying the replacement process of the telescopic device, making the entire maintenance process faster and more efficient.

[0025] In a specific possible implementation method, in step S1, when removing the telescopic device with the U-shaped groove, a removal device is used to chisel and clean the concrete at the bolt;

[0026] The demolition device includes a mobile frame, on which a laser assembly for cutting concrete is provided. Near the side plate of the L-shaped steel plate, the distance between the cutting line of the laser assembly cutting the concrete and the L-shaped steel plate is greater than or equal to the thickness of the bolt head. The mobile frame is provided with a ground drilling assembly for drilling the cut concrete. The mobile frame is provided with a clamping assembly for cleaning the chiseled concrete. The laser assembly, the ground drilling assembly and the clamping assembly are arranged along the length direction of the telescopic device.

[0027] Since directly excavating the concrete in the U-shaped groove can easily damage the bolts on the side wall of the U-shaped groove, making it difficult to remove the bolts, the laser component is first used to cut the concrete, and then the cut concrete is drilled by the ground drilling component, and finally the concrete in the U-shaped groove is taken out by the clamping component. In this way, the concrete can be excavated automatically, and the efficiency of the telescopic device can be further improved; and it can also avoid the damage to the bolt head, which will lead to the instability of disassembling the bolt.

[0028] In a specific possible implementation scheme, the laser assembly includes a driving motor arranged on a movable frame, a rotating handle is coaxially provided on the motor shaft of the driving motor, a rotating handle is rotatably connected to a rotating gear at one end away from the driving motor, a gear ring is provided on the movable frame, the rotating gear is located on the inner side of the gear ring and is meshed with the gear teeth, the axis of the gear ring is colinear with the axis of the motor shaft of the driving motor, an eccentric block is provided on the rotating gear, a sliding block is rotatably provided on the eccentric block, a laser cutting head for cutting concrete is provided on the sliding block, and the laser cutting head is externally connected to a laser; a first guide rail and a second guide rail are respectively provided on the movable frame, a limiting guide rail for sliding of the first guide rail is provided on the movable frame, the second guide rail is slidably connected to the first guide rail, a sliding groove is provided on the second guide rail for sliding of the sliding block, and the distance moved by the sliding block in the sliding groove is equal to the arc length of the rotation of the eccentric block.

[0029] When cutting concrete, the driving motor is used to drive the rotating handle to rotate, thereby driving the rotating gear to rotate along the gear ring, the rotating gear drives the eccentric block and the sliding block to rotate, and the sliding block drives the laser cutting head to move. When cutting, the rotating gear rotates along the gear ring, and the eccentric block pushes the sliding block to slide along the sliding groove. The laser cutting head can avoid the bolts along the length direction of the U-shaped groove and cut the concrete in a straight line. The driving motor continues to rotate the rotating handle, and the rotating gear drives the sliding block to move to the end of the sliding groove. The sliding block squeezes the sliding groove wall and pushes the second guide rail to move along the first guide rail. The first guide rail slides along the limit guide rail, and so on. The concrete can be cut into rectangular blocks, so that only partial cutting of the concrete at the bolt can be achieved.

[0030] In a specific feasible implementation scheme, a fixed motor is provided on the movable frame, a screw is coaxially provided on the motor shaft of the fixed motor, a movable block is threadedly connected to the screw, a baffle is detachably connected to the movable block, and the baffle contacts the inner side of the side beam.

[0031] Since the baffle needs to extend below the bridge surface, the baffle and the moving block are detachably arranged, so that the moving frame can be easily moved. When the moving frame is across the telescopic device, the position of the baffle is adjusted and then the baffle is installed on the moving block.

[0032] When it is necessary to excavate concrete, the motor drives the lead screw to rotate according to the width of the U-shaped groove, so that the position of the moving block can be adjusted, and then the position of the baffle can be adjusted. When the moving frame moves along the length direction of the telescopic device, the baffle is used to contact the side beam. On the one hand, the moving trajectory of the moving frame can be limited to avoid the deviation of the moving frame, avoid skewed cutting, and even cut the bolt head; on the other hand, since the thickness of the bolt head is certain, when the width of the U-shaped groove changes, the distance between the baffle and the laser cutting head can be adjusted to avoid the laser cutting head cutting the bolt head in the U-shaped groove, or the cutting line is too far away from the bolt head, resulting in the need to clean too much concrete near the bolt head, affecting the disassembly efficiency.

[0033] In a specific possible implementation scheme, the drilling assembly includes a moving seat slidably arranged on a moving frame, a thrust cylinder is provided on the moving seat, a drilling device is provided on the piston rod of the thrust cylinder, and a power cylinder for pushing the movement is provided on the moving frame, and the axis of the power cylinder is perpendicular to the moving trajectory of the moving frame.

[0034] When breaking concrete, the drilling equipment is moved to the top of the concrete to be cut, the thrust cylinder pushes the drilling equipment downward, the drilling equipment is used to drill the concrete, the power cylinder pushes the moving base to move, the position of the drilling equipment is changed, and the cut concrete is drilled at multiple points, so that the concrete can be drilled.

[0035] In a specific possible implementation scheme, the clamping assembly includes a moving plate and two clamping plates, the moving frame is provided with a lifting cylinder connected to the moving plate, the two clamping plates are cross-arranged, the intersection of the two clamping plates is rotatably connected through a hinge shaft, and the maximum distance between the front ends of the two clamping plates after opening is less than or equal to the moving track of the first guide rail on the limit guide rail;

[0036] The ends of the two clamping plates are both provided with push plates, the moving plate is provided with a through slot for the sliding of the push plates, the moving plate is hinged with a pushing cylinder, and the end of the pushing cylinder piston rod is hingedly connected to the push plate.

[0037] After the concrete is drilled, the lifting cylinder is used to push the movable plate downward, and the clamp is inserted into the area formed by laser cutting. The clamp fits the concrete side wall in the U-shaped groove and moves downward until it moves close to the bottom of the U-shaped groove. The pushing cylinder is used to push the push plate outward, and the two clamps are relatively close to each other, so that the concrete fragments in the laser cutting area can be clamped. The lifting cylinder is then used to drive the movable plate upward, and the concrete fragments in the U-shaped groove can be taken out. This can replace manual cleaning and improve the efficiency of replacing the telescopic device.

[0038] Since the maximum distance between the front ends of the two clamping plates is less than or equal to the moving track of the first guide rail on the limiting guide rail, the clamping plates can be prevented from being inserted into the area outside the cutting area.

[0039] Beneficial technical effects of the present invention:

[0040] 1. By chiseling away the concrete in the U-shaped groove near the bolts and then removing the bolts, the removal and installation process is greatly simplified, the construction time is shortened, the replacement efficiency of the telescopic device is significantly improved, the curing time of the newly poured concrete is increased, the strength and elastic modulus of the concrete are improved, and the stability and durability of the telescopic device and its surrounding structures are ensured;

[0041] 2. Through the automated operation of laser cutting, ground drilling and clamping components, the removal and installation process is greatly simplified, the manual operation time is reduced, and the replacement efficiency of the telescopic device is significantly improved; and the precise control of laser cutting and drilling operations avoids damage to the U-shaped groove side wall bolts, reduces the structural damage that may be caused by direct excavation in traditional methods, and enhances construction safety;

[0042] 3. The L-shaped steel plate is used to protect the expansion joint notch, which enhances the rigidity of the expansion joint notch and avoids damage to the bridge deck or abutment back wall at the notch caused by repeated chiseling of concrete at the notch when replacing the expansion device. This enhances the anchoring performance of the expansion device and extends the service life of the expansion device. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 It is a structural schematic diagram of a method for rapid assembly and disassembly of an assembled bridge expansion device according to an embodiment of the present invention.

[0044] Figure 2 It is a cross-sectional view of a bolt, a U-shaped groove and an L-shaped steel plate in an embodiment of the present invention.

[0045] Figure 3 It is a schematic diagram of the structure of the panel and the exhaust hole in the embodiment of the present invention.

[0046] Figure 4 It is a schematic diagram of the structure of a demolition device on a bridge according to an embodiment of the present invention.

[0047] Figure 5 It is a schematic diagram of the structure of a fixed motor, a lead screw, a moving block and a baffle in an embodiment of the present invention.

[0048] Figure 6 It is a schematic diagram of the structure of the laser assembly in an embodiment of the present invention.

[0049] Figure 7 It is a schematic diagram of the structure of a clamping assembly and a ground drilling assembly in an embodiment of the present invention.

[0050] Explanation of the reference numerals: 1. bridge; 3. U-shaped groove; 4. bolt; 5. L-shaped steel plate; 6. connecting pipe; 7. panel; 8. exhaust hole; 9. movable frame; 10. laser assembly; 11. drilling assembly; 12. clamping assembly; 13. fixed motor; 14. screw rod; 15. moving block; 16. baffle; 17. driving motor; 18. rotating handle; 19. rotating gear; 20. gear ring; 21. eccentric block; 22. sliding block; 23. laser cutting head; 24. first guide rail; 25. second guide rail; 26. limit guide rail; 27. sliding through groove; 28. moving plate; 29. ​​clamping plate; 30. lifting cylinder; 31. hinge shaft; 33. push plate; 34. through groove; 35. pushing cylinder; 36. moving seat; 37. thrust cylinder; 38. drilling equipment; 39. power cylinder; 40. side beam. DETAILED DESCRIPTION

[0051] The following is combined with Figure 1-7 The present invention is described in further detail.

[0052] Reference Figure 1 and Figure 2 The method for quickly disassembling and assembling the assembled bridge expansion device comprises the following steps:

[0053] S1. On the newly constructed bridge 1, an L-shaped steel plate 5 is installed at the expansion joint notch of the bridge 1;

[0054] When repairing the expansion joint device, if there is an L-shaped steel plate 5 at the expansion joint notch of the bridge 1, then at the bolt 4 of the U-shaped groove 3 of the original expansion joint device, the concrete in the U-shaped groove 3 is chiseled off to expose the bolt 4, the bolt 4 is removed, the original expansion joint device is lifted to expose the L-shaped steel plate 5; if there is no L-shaped steel plate 5 at the expansion joint notch of the bridge 1, the concrete at the expansion joint notch is chiseled off, the original expansion joint device is lifted and moved out of the notch, and then the L-shaped steel plate 5 is installed in the expansion joint notch;

[0055] When removing the telescopic device with the U-shaped groove 3, according to the position of the marked part, the concrete in the U-shaped groove 3 and at the bolt 4 is cut and cleaned by using the removal device;

[0056] Then clean the concrete near the head of the bolt 4 to expose the head of the bolt 4, rotate the head of the bolt 4, remove the bolt 4, and the original telescopic device can be separated from the L-shaped steel plate 5 of the expansion joint slot, and then use the lifting device to lift and remove the original telescopic device;

[0057] S2, hoist the new telescopic device, place the U-shaped groove 3 of the new telescopic device on the L-shaped steel plate 5 at the notch of the expansion joint, and use the bolt 4 to pass through the U-shaped groove 3 and threadedly connect it to the connecting pipe 6;

[0058] S3. If there are steel side plates at both ends of the U-shaped groove, pour concrete into the U-shaped groove 3; if there are no steel side plates, first install the side formwork and then pour concrete into the U-shaped groove 3;

[0059] If there is no panel 7 on the U-shaped groove 3 of the new telescopic device, the panel 7 is installed on the top wall of the U-shaped groove 3, and one side of the panel 7 is welded to the side beam 40 of the telescopic device, and the other side is welded to the side of the U-shaped groove 3.

[0060] S4. After the concrete is cured, if there is a formwork, remove it first and then open it to traffic; if there is no formwork, open it to traffic directly.

[0061] The connecting pipe 6 is respectively arranged on the side wall and the bottom wall of the L-shaped steel plate 5 , and the connecting pipe 6 and the L-shaped steel plate 5 are both buried in the concrete of the bridge 1 .

[0062] In this embodiment, friction lines are respectively provided on the panel 7;

[0063] Reference Figure 3 In other embodiments, a plurality of exhaust holes 8 are provided on the panel 7, and the connecting pipe 6 is below the exhaust holes 8. If the panel 7 with the exhaust holes 8 is welded, the panel 7 can be welded before or after pouring the concrete.

[0064] Reference Figure 4 and Figure 5 The demolition device includes a mobile frame 9. During construction, the mobile frame 9 is placed across the telescopic device. The mobile frame 9 is provided with a laser component 10 for cutting the concrete in the U-shaped groove 3. Near the side plate of the L-shaped steel plate 5, the distance between the cutting line formed by the laser component 10 cutting the concrete and the L-shaped steel plate 5 is greater than or equal to the thickness of the head of the bolt 4. The mobile frame 9 is provided with a drilling component 11 for drilling the cut concrete. The mobile frame 9 is provided with a clamping component 12 for cleaning the chiseled concrete. The laser component 10, the drilling component 11 and the clamping component 12 are arranged along the length direction of the telescopic device.

[0065] A fixed motor 13 is provided on the movable frame 9, and a screw rod 14 is coaxially provided on the motor shaft of the fixed motor 13. The screw rod 14 is arranged along the width direction of the telescopic device. A movable block 15 is threadedly connected to the screw rod 14, and a baffle 16 is detachably connected to the movable block 15. The baffle 16 contacts the inner side of the side beam 40. In this embodiment, a T-slot is provided on the movable block 15, and a T-block inserted into the T-slot is provided on the baffle 16.

[0066] Reference Figure 6The laser assembly 10 includes a driving motor 17 arranged on the moving frame 9, and a rotating handle 18 is coaxially provided on the motor shaft of the driving motor 17. The rotating handle 18 is arranged radially along the motor shaft of the driving motor 17. The rotating handle 18 is rotatably connected to a rotating gear 19 at one end away from the driving motor 17. A gear ring 20 is provided on the bottom wall of the moving frame 9. The inner side of the gear ring 20 has a plurality of gear teeth along its own circumference. The rotating gear 19 is located on the inner side of the gear ring 20 and is meshed with the gear teeth. The axis of the gear ring 20 is colinear with the axis of the motor shaft of the driving motor 17. An eccentric block 21 is provided on the rotating gear 19. A sliding block 22 is rotatably provided on the eccentric block 21. The sliding block 2 2 is provided with a laser cutting head 23 for cutting concrete, and the laser cutting head 23 is externally connected to a laser; the mobile frame 9 is respectively provided with a first guide rail 24 and a second guide rail 25, the first guide rail 24 is located on the outer side of the gear ring 20, the first guide rail 24 and the second guide rail 25 are both horizontally arranged, a limiting guide rail 26 for the first guide rail 24 to slide is provided on the bottom wall of the mobile frame 9, the second guide rail 25 is slidably connected to the first guide rail 24, and a sliding groove 27 for the sliding block 22 to slide is provided on the second guide rail 25, the distance that the sliding block 22 moves in the sliding groove 27 is equal to the arc length of the rotation of the eccentric block 21, and the laser cutting head 23 is located below the second guide rail 25.

[0067] Reference Figure 7 The ground drilling assembly 11 includes a moving seat 36 slidably arranged on the moving frame 9, a thrust cylinder 37 is arranged on the moving seat 36, a ground drilling device 38 is arranged on the piston rod of the thrust cylinder 37, and the ground drilling device 38 can be an electric pick in this embodiment, and a power oil cylinder 39 is arranged on the moving frame 9 to push and move, and the axis of the power oil cylinder 39 is perpendicular to the moving track of the moving frame 9. A connecting plate is arranged on the end surface of the piston rod of the power oil cylinder, and the ground drilling device 38 is provided with a lifting rod sliding on the connecting plate, and a shock absorbing spring is arranged between the connecting plate and the ground drilling device.

[0068] The clamping assembly 12 includes a movable plate 28 and two clamping plates 29. The movable frame 9 is provided with a lifting cylinder 30 connected to the movable plate 28. The lifting cylinder 30 is vertically arranged, and the two clamping plates 29 are cross-arranged. The intersection of the two clamping plates 29 is rotatably connected through a hinge shaft 31. The maximum distance after the front ends of the two clamping plates 29 are opened is less than or equal to the moving trajectory of the first guide rail 24 on the limiting guide rail 26. The width of the front end of the clamping plate 29 is less than or equal to the moving trajectory of the laser cutting head 23 in the sliding groove 27. In this embodiment, the maximum distance after the front ends of the two clamping plates 29 are opened is less than the moving trajectory of the first guide rail 24 on the limiting guide rail 26, and the width of the front end of the clamping plate 29 is less than the moving trajectory of the laser cutting head 23 in the sliding groove 27.

[0069] The two clamping plates 29 are in an open state, with one clamping plate 29 leaning against one side of the side plate of the L-shaped steel plate 5, and the other clamping plate 29 leaning against one side of the side beam 40;

[0070] A push plate 33 is provided at the end of each of the two clamping plates 29 . A through slot 34 is provided on the moving plate 28 for the pushing plate 33 to slide. A pushing cylinder 35 is hingedly connected to the moving plate 28 . The end of the piston rod of the pushing cylinder 35 is hingedly connected to the pushing plate 33 .

[0071] The above are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for quickly disassembling and assembling an assembled bridge expansion device, characterized in that: The steps include: S1. On a newly constructed bridge (1), an L-shaped steel plate (5) is embedded in the notch of the expansion joint of the bridge (1); When repairing the expansion joint, if there is an L-shaped steel plate (5) at the expansion joint notch of the bridge (1), then at the bolt (4) of the U-shaped groove (3) of the original expansion joint, the concrete in the U-shaped groove (3) is chiseled off to expose the bolt (4), the bolt (4) is removed, the original expansion joint is lifted to expose the L-shaped steel plate (5); if there is no L-shaped steel plate (5) at the expansion joint notch of the bridge (1), then the concrete at the notch is chiseled off, the original expansion joint is lifted and moved out of the notch, and then the L-shaped steel plate (5) is installed in the expansion joint notch; S2, lifting the new telescopic device, placing the U-shaped groove (3) of the new telescopic device on the L-shaped steel plate (5) at the notch of the expansion joint, and using bolts (4) to pass through the U-shaped groove (3) and threadedly connect it to the connecting pipe (6); S3. If there are side panels at both ends of the U-shaped groove (3), concrete is poured into the U-shaped groove (3); if there are no side panels, a lateral formwork is installed and concrete is poured into the U-shaped groove (3); S4. After the concrete is cured, remove the formwork and open to traffic.

2. The method for rapid assembly and disassembly of the assembled bridge expansion device according to claim 1 is characterized in that: The connecting pipe (6) is respectively arranged on the side wall and the bottom wall of the L-shaped steel plate (5); the connecting pipe (6) and the L-shaped steel plate (5) are both buried in the bridge (1).

3. The method for rapid assembly and disassembly of the assembled bridge expansion device according to claim 1 is characterized in that: In step S1, when the concrete is chiseled off, the chiseling is performed according to the marking portion.

4. The method for rapid assembly and disassembly of the assembled bridge expansion device according to claim 1 is characterized in that: In step S3, if there is no panel (7) on the U-shaped groove (3) of the new telescopic device, a panel (7) is installed on the top wall of the U-shaped groove (3), and one side of the panel (7) is connected to the side beam (40) of the telescopic device, and the other side is connected to the side of the U-shaped groove (3).

5. The method for rapid assembly and disassembly of the assembled bridge expansion device according to claim 4 is characterized in that: The panel (7) is provided with friction lines, or the panel (7) is provided with a plurality of exhaust holes (8).

6. The method for rapid assembly and disassembly of the assembled bridge expansion device according to claim 1 is characterized in that: In step S1, when dismantling the telescopic device with the U-shaped groove (3), the concrete at the bolt (4) is chiseled and cleaned using a dismantling device; The dismantling device comprises a mobile frame (9), the mobile frame (9) is provided with a laser assembly (10) for cutting concrete at the bolt (4), near the side plate of the L-shaped steel plate (5), the distance between the cutting line of the concrete cut by the laser assembly (10) and the L-shaped steel plate (5) is greater than or equal to the thickness of the head of the bolt (4), the mobile frame (9) is provided with a ground drilling assembly (11) for drilling the cut concrete, the mobile frame (9) is provided with a clamping assembly (12) for cleaning the chiseled concrete, and the laser assembly (10), the ground drilling assembly (11) and the clamping assembly (12) are arranged along the length direction of the telescopic device.

7. The method for rapid assembly and disassembly of the assembled bridge expansion device according to claim 6 is characterized in that: The movable frame (9) is provided with a fixed motor (13), the motor shaft of the fixed motor (13) is coaxially provided with a screw rod (14), a movable block (15) is threadedly connected to the screw rod (14), a baffle (16) is detachably connected to the movable block (15), and the baffle (16) contacts the inner side of the side beam (40).

8. The method for rapid assembly and disassembly of the assembled bridge expansion device according to claim 6 is characterized in that: The laser assembly (10) comprises a driving motor (17) arranged on a moving frame (9), a motor shaft of the driving motor (17) being coaxially provided with a rotating handle (18), an end of the rotating handle (18) away from the driving motor (17) being rotatably connected with a rotating gear (19), a gear ring (20) being arranged on the moving frame (9), the rotating gear (19) being located inside the gear ring (20) and meshing with the gear teeth, the axis of the gear ring (20) being colinear with the axis of the motor shaft of the driving motor (17), an eccentric block (21) being rotatably provided on the eccentric block (21) 22), the sliding block (22) is provided with a laser cutting head (23) for cutting concrete, and the laser cutting head (23) is externally connected to a laser; the moving frame (9) is respectively provided with a first guide rail (24) and a second guide rail (25), the moving frame (9) is provided with a limit guide rail (26) for the first guide rail (24) to slide, the second guide rail (25) is slidably connected to the first guide rail (24), the second guide rail (25) is provided with a sliding groove (27) for the sliding block (22) to slide, and the distance moved by the sliding block (22) in the sliding groove (27) is equal to the arc length of the rotation of the eccentric block (21).

9. The method for rapid assembly and disassembly of the assembled bridge expansion device according to claim 8 is characterized in that: The clamping assembly (12) comprises a movable plate (28) and two clamping plates (29); a lifting cylinder (30) connected to the movable plate (28) is provided on the movable frame (9); the two clamping plates (29) are arranged crosswise, and the intersection of the two clamping plates (29) is rotatably connected via a hinge shaft (31); the maximum distance between the front ends of the two clamping plates (29) after opening is less than or equal to the moving track of the first guide rail (24) on the limit guide rail (26); The ends of the two clamping plates (29) are each provided with a push plate (33), the movable plate (28) is provided with a through groove (34) for the push plate (33) to slide, the movable plate (28) is hingedly connected with a push cylinder (35), and the end of the piston rod of the push cylinder (35) is hingedly connected to the push plate (33).

10. The method for rapid assembly and disassembly of the assembled bridge expansion device according to claim 6, characterized in that: The ground drilling assembly (11) comprises a moving seat (36) slidably arranged on a moving frame (9), a thrust cylinder (37) is arranged on the moving seat (36), a ground drilling device (38) is arranged on the piston rod of the thrust cylinder (37), and a power cylinder (39) for pushing the moving frame (9) is arranged on the moving frame (9), and the axis of the power cylinder (39) is perpendicular to the moving track of the moving frame (9).

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