Bridge expansion joint structure

Abstract

The invention discloses a bridge expansion joint structure, and relates to the technical field of expansion joints. A sealing tape; the plugging plate and the profile steel base are provided with supporting assemblies. The connecting blocks comprise a first connecting block and a second connecting block; gas conveying grooves are formed in the opposite plugging plates, and gas spraying holes are formed in the opposite sides of the opposite plugging plates correspondingly. The connecting block is inclined to form a guide surface opposite to the air injection hole; the air injection hole is located above the extrusion air bag, and the extrusion air bag is provided with a communicating pipe; extrusion plates are respectively arranged at the bottoms of the opposite profile steel seats; an air supply air bag is arranged between the opposite extrusion plates, a communication hole communicated to the extrusion air bag is formed in the air supply air bag, and a one-way air inlet valve is arranged on the bag wall of the air supply air bag; a control assembly; when the extrusion airbag is relaxed, the control assembly controls the communicating hole to be blocked; when the connecting blocks are adjacent to the opposite profile steel seats, the control assemblies control the communicating holes to be released instantly. The possibility that sundries fall on the rubber sealing belt can be reduced.

Description

Technical Field

[0001] The present application relates to the technical field of expansion joints, and in particular to a bridge expansion joint structure. Background Art

[0002] Bridge expansion joints are devices set up to meet the deformation requirements of the bridge deck. They are usually located between the two beam ends, between the beam ends and the abutments, or at the hinged positions of the bridge. They are mainly used to protect the bridge structure and alleviate expansion deformation.

[0003] At present, the main structure of the bridge expansion joint includes steel and rubber sealing strips. During installation, the steel is symmetrically arranged on the bridge end faces on both sides of the gap, and the two ends of the rubber sealing strip are connected to the opposite end faces of the steel.

[0004] However, there are certain debris, garbage and other debris on the bridge surface. As the bridge is put into use, the debris may fall on the rubber sealing tape. In addition, when the amount of debris is large or the bridge expands or contracts, the sealing ability of the rubber sealing tape is easily affected. Summary of the invention

[0005] In order to reduce the possibility of debris falling onto the rubber sealing strip, the present application provides a bridge expansion joint structure.

[0006] The present application provides a bridge expansion joint structure, which adopts the following technical solution: A bridge expansion joint structure comprises a steel seat, wherein the steel seat is arranged on a side of the bridge and the steel seat is symmetrically arranged; A sealing belt connected to the opposite side of the steel seat; A blocking plate is symmetrically arranged between the steel seats, and the steel seats are provided with a supporting assembly for supporting the blocking plate; A connecting block, wherein the connecting block comprises a first connecting block and a second connecting block, wherein the first connecting block and the second connecting block are respectively arranged on opposite sides of the blocking plate, the first connecting block and the second connecting block are arranged alternately, and adjacent first connecting blocks and second connecting blocks are in sliding contact with each other; An air delivery groove is formed in the blocking plate, and jet holes connected to the air delivery groove are formed on the opposite sides of the blocking plate, and there are multiple jet holes corresponding to the connecting blocks one by one; The connecting block is inclined to form a guide surface facing the air injection hole; There are multiple extrusion airbags, which are respectively located between the adjacent first connecting blocks and the second connecting blocks. The jet holes are located above the extrusion airbags, and the extrusion airbags are provided with a connecting pipe connected to the air delivery groove; Extrusion plates are respectively arranged at the bottom of the steel seat, wherein a support plate slidably connected to the other extrusion plate is arranged at the bottom of one of the extrusion plates; An air supply airbag is arranged between the extrusion plates, the air supply airbag is formed with a connecting hole connected to the extrusion airbag, and a one-way air inlet valve is arranged on the bag wall of the air supply airbag; A control component, arranged on the extrusion airbag; When the squeezing airbag expands, the control component controls the connecting hole to be blocked; When the connecting block is adjacent to the profiled steel seat, the control assembly controls the communicating hole to be released instantly.

[0007] By adopting the above technical solution, when the bridge expansion joint structure is in use, debris falls between the first connecting block and the second connecting block. At this time, the extrusion airbag supports the debris, reducing the possibility of the debris falling on the sealing belt. When the bridge is deformed so that the steel seats are close to each other, the extrusion airbag and the air supply airbag are squeezed, so that the air jet holes eject air, pushing the debris between the first connecting block and the second connecting block out along the guide surface, reducing the possibility of the debris blocking the first connecting block and the second connecting block from approaching the relative steel seats.

[0008] Optionally, the control assembly includes a control sleeve, a control column, a control rope, an inner column and an outer column; The inner column is arranged on one side wall of the extrusion airbag, and the outer column is arranged on the opposite side wall of the other side of the extrusion airbag. The inner column is slidably connected to the outer column and is coaxially arranged; The control sleeve is arranged on the wall of the communicating hole and is coaxially arranged, the control column slides up and down on the control sleeve, the outer peripheral side wall of the control column is slidably connected with the control sleeve, and the peripheral side wall of the control column is formed with a plurality of ventilation grooves penetrating downward along the axial direction to the outside of the control column; One end of the control rope is connected to the end of the inner column, and the other end is connected to the top of the control column. A sliding groove for sliding the control rope is formed along the axial direction on the peripheral side wall of the inner column. When the extrusion airbag is expanded, the top groove wall of the ventilation groove is located inside the control sleeve; When the connecting block is adjacent to the profiled steel seat, the control rope pulls the control column to move upward until the top groove wall of the ventilation groove slides out of the control sleeve.

[0009] By adopting the above technical solution, the control component includes components such as a control sleeve, a control column, a control rope, an inner column and an outer column, and precise control of the connecting hole is achieved through the control component. When the extrusion airbag is dilated, the control column maintains a closed state of the connecting hole under the action of the driving spring. When the connecting block is adjacent to the steel seat, the control rope pulls the control column upward, causing the top groove wall of the ventilation groove to slide out of the control sleeve, instantly opening the connecting hole, allowing gas to flow from the air supply airbag into the extrusion airbag, and finally ejected from the jet hole. This design is not only simple in structure and easy to operate, but also can increase the amount of debris that is pushed out of the first connecting block and the second connecting block by the airflow.

[0010] Optionally, a support bar is provided at the bottom of the control column, and a driving spring is sleeved on the outer peripheral side of the control column; The bottom of the driving spring abuts against the supporting bar, and the top of the driving spring abuts against the bottom of the control sleeve.

[0011] By adopting the above technical solution, a support strip is arranged at the bottom of the control column, and a driving spring is sleeved on the outer peripheral side of the control column, which can ensure that the control column can keep the top groove wall of the ventilation groove in the control sleeve when not affected by external force.

[0012] Optionally, the support assembly includes a support block and a support column, the support block is arranged on the side wall of the steel seat, and the support column connects the sealing plate and the support block.

[0013] By adopting the above technical solution, the support assembly includes a support block and a support column, the support column is fixed to the steel base through the support block, and the blocking plate is connected through the support column. This design is not only simple in structure and easy to maintain, but also can effectively support the blocking plate and reduce its displacement or deformation due to external force.

[0014] Optionally, the support block forms a clamping groove for the support column to be clamped into, and the support column has friction with the wall of the clamping groove.

[0015] By adopting the above technical solution, a clamping groove for the support column to be clamped into is formed on the support block, and the stability of the support column is maintained by the friction between the support column and the wall of the clamping groove. In addition, the design of the clamping groove also facilitates the installation and removal of the support column, thereby improving the maintainability of the entire structure.

[0016] Optionally, a slider is slidably connected to the bottom of the blocking plate, and the top of the support column is ball-hinged to the slider; A guide column is slidably connected between the extrusion plates, and a power spring is sleeved on the outer peripheral side of the guide column. Two ends of the power spring are respectively abutted against the opposite sides of the extrusion plates.

[0017] By adopting the above technical solution, a slider is slidably connected at the bottom of the blocking plate, and the top of the support column is ball-hinged to the slider, which allows the blocking plate to be fine-tuned within a certain range to adapt to the settlement changes of the bridge. At the same time, the setting of the guide column and the power spring can also provide stable support and thrust for the extrusion plate, ensuring that the blocking plate abuts against the steel seat, further reducing the possibility of debris falling into the sealing belt.

[0018] Optionally, the air jet hole is arranged obliquely downward toward the extrusion airbag.

[0019] By adopting the above technical solution, the jet hole is tilted downward toward the extrusion airbag, which can ensure that the gas can directly act on the debris on the extrusion airbag when it is ejected, thereby increasing the amount of debris that escapes from the first connecting block and the second connecting block along the guide surface.

[0020] Optionally, the air injection hole is in a flared structure on a side away from the air delivery groove.

[0021] By adopting the above technical solution, the side of the gas jet hole away from the gas delivery groove is designed into a flared structure, which can increase the gas ejection speed and pressure, so that it can better act on the debris on the squeezing airbag. At the same time, the flared structure can also reduce the energy loss of the gas during the ejection process and improve the utilization efficiency of the gas.

[0022] In summary, the present application includes at least one of the following beneficial effects: 1. When the bridge expansion joint structure is in use, debris falls between the first connection block and the second connection block. At this time, the extrusion airbag supports the debris, reducing the possibility of debris falling on the sealing belt. When the bridge deforms and the steel seats are close to each other, the extrusion airbag and the air supply airbag are squeezed, causing the air jet holes to eject air, pushing the debris between the first connection block and the second connection block out along the guide surface, reducing the possibility of debris preventing the first connection block and the second connection block from approaching the relative steel seats; 2. Slide the slider at the bottom of the blocking plate, and hinge the slider with a ball on the top of the support column, which allows the blocking plate to be fine-tuned within a certain range to adapt to the settlement changes of the bridge. At the same time, the setting of the guide column and the power spring can also provide stable support and thrust for the extrusion plate, ensuring that the blocking plate abuts against the steel seat, further reducing the possibility of debris falling into the sealing belt. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the external structure of an embodiment of the present application; Figure 2 is a schematic diagram of an internal cross-section of an embodiment of the present application; Figure 3 yes Figure 2 A magnified schematic diagram of part A; Figure 4 This is a schematic diagram of the connection structure between the blocking plate and the steel seat in the embodiment of the present application; Figure 5 yes Figure 4 An enlarged schematic diagram of part B.

[0024] 1. Steel seat; 11. Sealing belt; 12. Extrusion plate; 121. Guide column; 122. Power spring; 13. Support plate; 2. Blocking plate; 21. Air delivery groove; 22. Jet hole; 23. Slider; 3. Connecting block; 31. First connecting block; 32. Second connecting block; 33. Guide surface; 4. Support assembly; 41. Support block; 411. Snap-in groove; 42. Support column; 5. Extrusion airbag; 51. Connecting pipe; 6. Air supply airbag; 61. Connecting hole; 62. One-way air inlet valve; 7. Control assembly; 71. Control sleeve; 72. Control column; 721. Ventilation groove; 722. Support bar; 73. Control rope; 74. Inner column; 741. Slide groove; 75. Outer column; 76. Drive spring. DETAILED DESCRIPTION

[0025] The following is combined with Figure 1-5 This application is described in further detail.

[0026] An embodiment of the present application discloses a bridge expansion joint structure.

[0027] See also Figure 1 The bridge expansion joint structure includes a steel seat 1. There are two steel seats 1, which are respectively arranged on the side walls of the bridge on both sides of the expansion joint. The length extension direction of the steel seat 1 is parallel to the extension direction of the expansion joint. A plurality of steel bar segments are fixed on the side wall of the steel seat 1 facing the bridge. When the steel seat 1 is connected to the bridge, a cement trough is first excavated on the side of the bridge close to the expansion joint, and a steel bar cage is tied in the cement trough; the steel seat 1 is installed and placed in the cement trough, and the steel bar segments and the steel bar cage are tied to each other. Finally, cement is poured in the cement trough. After the cement solidifies, the steel seat 1 is connected and fixed to the bridge.

[0028] See also Figure 2 and Figure 3 The bridge expansion joint structure also includes a sealing belt 11 and a blocking plate 2. The sealing belt 11 is made of rubber material, and the two ends of the rubber belt are respectively connected and fixed to the opposite sides of the two steel seats 1. The blocking plate 2 is arranged between the two steel seats 1 and is located directly above the sealing belt 11. There are two blocking plates 2 and they are symmetrically arranged. The steel seat is provided with a support assembly 4 for supporting the blocking plate 2.

[0029] The support assembly 4 includes support blocks 41 and support columns 42 . There are two groups of support blocks 41 which are respectively fixedly connected to the opposite side walls of the steel base 1 . Each group of support blocks 41 has a plurality of support blocks 41 which are evenly spaced along the length extension direction of the steel base 1 .

[0030] See also Figure 4 and Figure 5 The bottom of the blocking plate 2 is formed with a sliding groove of a "T"-shaped structure extending in the direction of the other blocking plate 2, and there is a one-to-one correspondence between the sliding groove and the support block 41. The blocking plate 2 is provided with a slider 23 of a "T"-shaped structure, and the slider 23 is slidably connected to the sliding groove. The top ball of the support column 42 is hinged to the bottom of the slider 23, and there is a one-to-one correspondence between the support column 42 and the slider 23. A snap-in groove 411 is formed on the top of the support block 41, and the support column 42 is snapped into the snap-in groove 411, and there is friction between the support column 42 and the groove wall of the snap-in groove 411. At this time, the support block 41 supports the blocking plate 2 through the support column 42.

[0031] The bridge expansion joint structure also includes a connection block 3, which includes a first connection block 31 and a second connection block 32. The first connection block 31 is fixedly connected to a vertical side wall of one of the steel seats 1 away from the bridge. There are multiple first connection blocks 31 and they are evenly spaced along the extension direction of the steel seat 1. The second connection block 32 is fixedly connected to a vertical side wall of another steel seat 1 away from the bridge. There are multiple second connection blocks 32 and they are evenly spaced along the extension direction of the steel seat 1. The first connection blocks 31 and the second connection blocks 32 are staggered, and the adjacent first connection blocks 31 and the second connection blocks 32 are in sliding contact, which is conducive to reducing the possibility of debris falling on the sealing belt 11.

[0032] See also Figure 2 and Figure 3 , air delivery grooves 21 are respectively formed in the two blocking plates 2, and the air delivery grooves 21 extend along the length direction of the steel seat 1. Jet holes 22 are respectively formed on the opposite sides of the blocking plates 2, and the jet holes 22 are connected to the air delivery grooves 21. There are multiple jet holes 22, each of which is located between two adjacent first connecting blocks 31 and second connecting blocks 32, and the jet holes 22 are directly opposite to the first connecting blocks 31 and the second connecting blocks 32. The first connecting blocks 31 and the second connecting blocks 32 are respectively inclined to form guide surfaces 33, and the guide surfaces 33 are directly opposite to the jet holes 22. The jet holes 22 are arranged obliquely downward in the direction of the extrusion airbag 5, and the jet holes 22 are flared away from the side of the air delivery groove 21.

[0033] The bridge expansion joint structure also includes an extrusion airbag 5, which has multiple extrusion airbags 5 and is respectively located between two adjacent first connection blocks 31 and second connection blocks 32. The jet hole 22 is located above the extrusion airbag 5, and the top outer wall of the extrusion airbag 5 is adjacent to the jet hole 22. The extrusion airbag 5 is provided with a connecting pipe 51, which is penetrated through the steel seat 1, and the two ends of the connecting pipe 51 are respectively connected to the gas delivery groove 21 and the extrusion airbag 5.

[0034] See also Figure 4 and Figure 5, the bottom of the two relative steel seats 1 is fixedly connected with an extrusion plate 12, and the extrusion plate 12 extends along the length direction of the steel seat 1. Two guide posts 121 are slidably connected between the two extrusion plates 12, and the two guide posts 121 are respectively located near the vertical side walls on the opposite sides of the extrusion plate 12. The extrusion plate 12 is formed with a guide hole for the guide post 121 to slide, and there is a gap between the outer peripheral side wall of the guide post 121 and the hole wall of the guide hole. Stoppers are fixedly connected at both ends of the guide post 121 to limit the guide post 121 from being separated from the extrusion plate 12. A power spring 122 is sleeved on the outer peripheral side of the guide post 121, and the power spring 122 corresponds to the guide post 121 one by one, and the two ends of the power spring 122 are respectively abutted against the opposite sides of the two relative extrusion plates 12. When the power spring 122 is released elastically, it pushes the extrusion plate 12, so that the opposite sides of the two blocking plates 2 are respectively abutted against the steel seat 1, further reducing the possibility of debris falling on the sealing belt 11.

[0035] The bottom of one of the extrusion plates 12 is fixedly connected to a support plate 13, and the support plate 13 is slidably connected to the bottom of the other extrusion plate 12. An air supply bag 6 is arranged between the opposite extrusion plates 12, and the peripheral outer walls of the air supply bag 6 are respectively fixed to the extrusion plate 12 and the support plate 13, and the air supply bag 6 is located between the two guide columns 121.

[0036] See also Figure 3 and Figure 5 The air supply bag 6 is formed with a connecting hole 61, which connects the extrusion bag 5 and the air supply bag 6. A one-way air inlet valve 62 is fixedly mounted on the bag wall of the air supply bag 6. When the air supply bag 6 is expanded, external air can enter the air supply bag 6 through the one-way air inlet valve 62.

[0037] See also Figure 2 and Figure 3 The bridge expansion joint structure also includes a control component 7, which is arranged on the extrusion airbag 5. When the extrusion airbag 5 is expanded, the control component 7 controls the connecting hole 61 to be blocked; when the connecting block 3 is adjacent to the relative steel seat 1, the control component 7 controls the connecting hole 61 to be released instantly.

[0038] The control assembly 7 includes a control sleeve 71, a control column 72, a control rope 73, an inner column 74 and an outer column 75. The inner column 74 is fixedly connected to the vertical side wall of one side of the extrusion airbag 5 close to the steel seat 1, and the outer column 75 is fixedly connected to the vertical side wall of the other side of the extrusion airbag 5 close to the steel seat 1. The outer column 75 is formed with a connecting groove, the inner column 74 is slidably connected to the connecting groove, and the inner column 74 and the outer column 75 are coaxially arranged, and the inner column 74 and the outer column 75 correspond to the extrusion airbag 5 one by one.

[0039] The control sleeve 71 is fixedly connected to the peripheral wall of the communicating hole 61, and the central axis of the control sleeve 71 coincides with the central axis of the communicating hole 61. The control column 72 slides up and down on the control sleeve 71, and the two ends of the control column 72 protrude out of the control sleeve 71 respectively, and the control column 72 corresponds to the control sleeve 71 one by one.

[0040] The outer peripheral sidewall of the control column 72 is slidably connected to the inner peripheral wall of the control sleeve 71, and the peripheral sidewall of the control column 72 forms a ventilation groove 721. There are multiple ventilation grooves 721 and they extend along the axial direction of the control column 72, and the ventilation grooves 721 penetrate downward to the outside of the control column 72.

[0041] One end of the control rope 73 is connected to the end of the inner column 74 away from the wall of the squeezing airbag 5, and the other end is fixedly connected to the top of the control column 72. A slide groove 741 is formed on the side wall of the inner column 74. The slide groove 741 extends along the axial direction of the inner column 74 and penetrates to the outside of the inner column 74 in a direction away from the wall of the squeezing plate 12. The control rope 73 slides in the slide groove 741.

[0042] The bottom of the control column 72 is fixedly connected with a support bar 722, and the support bars 722 are symmetrically arranged. The outer peripheral side of the control column 72 is sleeved with a drive spring 76, the bottom of the drive spring 76 abuts against the top of the support bar 722, and the top of the drive spring 76 abuts against the bottom of the control sleeve 71.

[0043] In the initial state, the bridge is not deformed, at which time the extrusion airbag 5 is expanded, the elasticity of the driving spring 76 is released, and the control column 72 is pushed downward, so that the control rope 73 is in a taut state, and the top groove wall of the ventilation groove 721 is located in the control sleeve 71.

[0044] When the bridge is deformed, the two steel seats 1 approach each other, the first connection block 31 approaches the opposite steel seat 1, the second connection block 32 approaches the opposite steel seat 1, and the extrusion airbag 5 is squeezed by the blocking plate 2, so that the extruded gas first enters the gas delivery groove 21 through the connecting pipe 51, and then sprays out from the gas injection hole 22, so that the debris between the first connection block 31 and the second connection block 32 initially approaches the guide surface 33. When the first connection block 31 and the second connection block 32 are respectively adjacent to the corresponding steel seats 1, the inner column 74 slides into the connection groove. When the inner column 74 slides into the connecting groove, the control rope 73 is pulled to drive the control column 72 to move upward, so that the top groove wall of the ventilation groove 721 slides out of the control sleeve 71. At this time, the air in the air supply airbag 6 is released instantly, and the air in the air supply airbag 6 enters the extrusion airbag 5 through the ventilation groove 721, and then enters the air delivery groove 21 through the connecting pipe 51, and finally is ejected from the jet hole 22, so that the airflow can push the debris along the guide surface 33 to separate from the first connecting block 31 and the second connecting block 32, which is beneficial to reduce the amount of debris between the first connecting block 31 and the second connecting block 32, and reduce the possibility of excessive debris in the first connecting block 31 and the second connecting block 32 hindering the first connecting block 31 and the second connecting block 32 from approaching the relative steel seat 1. When the bridge deformation is restored, the two steel seats 1 move away from each other. At this time, the extrusion airbag 5 and the air supply airbag 6 expand and relax, and external air enters the extrusion airbag 5 and the air supply airbag 6. This is beneficial when the bridge deforms next time. The extrusion airbag 5 and the air supply airbag 6 can be squeezed again to push the debris out of between the first connecting block 31 and the second connecting block 32.

[0045] The implementation principle of a bridge expansion joint structure in the embodiment of the present application is: When the bridge expansion joint structure is in use, debris falls between the first connection block 31 and the second connection block 32. At this time, the extrusion airbag 5 supports the debris, reducing the possibility of the debris falling on the sealing belt 11. When the bridge is deformed so that the steel seats 1 are close to each other, the extrusion airbag 5 and the air supply airbag 6 are squeezed, so that the air jet hole 22 ejects air, pushing the debris between the first connection block 31 and the second connection block 32 out along the guide surface 33, reducing the possibility of the debris blocking the first connection block 31 and the second connection block 32 from approaching the relative steel seat 1.

[0046] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A bridge expansion joint structure, characterized in that: It comprises a profiled steel seat (1), wherein the profiled steel seat (1) is arranged on the side of the bridge, and the profiled steel seat (1) is symmetrically arranged; A sealing belt (11) connected to the opposite side of the profiled steel seat (1); A blocking plate (2) is symmetrically arranged relative to the steel seat (1), and the steel seat (1) is provided with a supporting assembly (4) for supporting the blocking plate (2); A connecting block (3), the connecting block (3) comprising a first connecting block (31) and a second connecting block (32), the first connecting block (31) and the second connecting block (32) being respectively arranged on opposite sides of the blocking plate (2), the first connecting block (31) and the second connecting block (32) being arranged alternately, and adjacent first connecting blocks (31) and second connecting blocks (32) being in sliding contact with each other; An air delivery groove (21) is formed in the sealing plate (2), and jet holes (22) connected to the air delivery groove (21) are formed on the opposite sides of the sealing plate (2), and there are a plurality of jet holes (22) corresponding to the connection blocks (3) one by one; The connecting block (3) is inclined to form a guide surface (33) facing the air injection hole (22); There are a plurality of extrusion airbags (5) which are respectively located between adjacent first connection blocks (31) and second connection blocks (32); the air injection holes (22) are located above the extrusion airbags (5); and the extrusion airbags (5) are provided with a connecting pipe (51) which is connected to the air delivery groove (21); Extrusion plates (12) are respectively arranged at the bottom of the profiled steel seat (1), wherein a support plate (13) slidably connected to another extrusion plate (12) is arranged at the bottom of one of the extrusion plates (12); An air supply airbag (6) is arranged between the extrusion plates (12), the air supply airbag (6) is formed with a communication hole (61) connected to the extrusion airbag (5), and a one-way air inlet valve (62) is arranged on the bag wall of the air supply airbag (6); A control component (7) disposed on the extrusion airbag (5); When the squeezing airbag (5) is expanded, the control component (7) controls the connecting hole (61) to be blocked; When the connection block (3) is adjacent to the profiled steel seat (1), the control component (7) controls the communication hole (61) to be released instantly.

2. A bridge expansion joint structure according to claim 1, characterized in that: The control assembly (7) comprises a control sleeve (71), a control column (72), a control rope (73), an inner column (74) and an outer column (75); The inner column (74) is arranged on a side wall of one side of the extrusion airbag (5), and the outer column (75) is arranged on an opposite side wall of the other side of the extrusion airbag (5). The inner column (74) is slidably connected to the outer column (75) and is coaxially arranged. The control sleeve (71) is arranged on the wall of the communicating hole (61) and is coaxially arranged. The control column (72) slides up and down on the control sleeve (71). The outer peripheral side wall of the control column (72) is slidably connected to the control sleeve (71). The peripheral side wall of the control column (72) is formed with a plurality of ventilation grooves (721) penetrating axially downward to the outside of the control column (72); One end of the control rope (73) is connected to the end of the inner column (74), and the other end is connected to the top of the control column (72); a sliding groove (741) for sliding the control rope (73) is formed along the axial direction on the peripheral side wall of the inner column (74); When the extrusion airbag (5) is expanded, the top groove wall of the ventilation groove (721) is located inside the control sleeve (71); When the connecting block (3) is adjacent to the profiled steel seat (1), the control rope (73) pulls the control column (72) upward until the top groove wall of the ventilation groove (721) slides out of the control sleeve (71).

3. A bridge expansion joint structure according to claim 2, characterized in that: A support bar (722) is provided at the bottom of the control column (72), and a driving spring (76) is sleeved on the outer circumference of the control column (72); The bottom of the driving spring (76) abuts against the support bar (722), and the top of the driving spring (76) abuts against the bottom of the control sleeve (71).

4. A bridge expansion joint structure according to claim 3, characterized in that: The support assembly (4) comprises a support block (41) and a support column (42); the support block (41) is arranged on a side wall of the profiled steel seat (1); and the support column (42) connects the blocking plate (2) and the support block (41).

5. A bridge expansion joint structure according to claim 4, characterized in that: The support block (41) forms a clamping groove (411) for the support column (42) to be clamped into, and there is friction between the support column (42) and the wall of the clamping groove (411).

6. A bridge expansion joint structure according to claim 5, characterized in that: The bottom of the blocking plate (2) is slidably connected to a slider (23), and the top of the support column (42) is ball-hinged to the slider (23); A guide column (121) is slidably connected between the extrusion plates (12), a power spring (122) is sleeved on the outer circumference of the guide column (121), and two ends of the power spring (122) are respectively in contact with the opposite sides of the extrusion plates (12).

7. The bridge expansion joint structure according to claim 1, characterized in that: The air injection hole (22) is arranged obliquely downward in the direction of the extrusion airbag (5).

8. The bridge expansion joint structure according to claim 7, characterized in that: The side of the gas injection hole (22) away from the gas delivery groove (21) is in a flared structure.

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