Steel trestle connecting structure

Abstract

The invention discloses a steel trestle connecting structure which is arranged at an expansion joint and comprises a plurality of connecting units, each connecting unit comprises a pair of connecting plates, and each connecting plate comprises a bottom plate, a transverse vertical plate and a longitudinal vertical plate which are arranged on the bottom plate; the pair of bottom elastic cushion layers are respectively laid on the bottom plates of the pair of connecting plates; the two ends of each sliding rail are arranged on the pair of bottom elastic cushion layers in a crossing mode, and sliding blocks are arranged on the sliding rails; the supporting frame comprises a supporting plate arranged on the sliding block and two limiting plates which are oppositely arranged; the sliding roller is placed on the supporting plate in a limiting manner; the pair of middle elastic cushion layers is laid on the two sides of the sliding roller. The two groups of toothed plates are oppositely arranged on the pair of transverse vertical plates and are arranged in a staggered manner; and the arch-shaped filler strips are filled in gaps between the two adjacent toothed plates, between the toothed plates and the opposite transverse vertical plates and between the toothed plates and the longitudinal vertical plates. Vertical and transverse vibration caused by a beam body can be effectively absorbed, and the stability of a bridge deck is prevented from being affected.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge engineering, and more particularly to a steel trestle bridge connection structure. Background Art

[0002] Due to the structure of the steel trestle beam, the beam will produce vertical and lateral vibration responses, and this beam vibration is harmful to the stability of the bridge structure, mainly including the following points: 1. Resonance phenomenon: When a bridge is subjected to external forces, if the vibration frequency of the external force is close to the natural frequency of the bridge, resonance may occur. This resonance will cause the amplitude of the bridge to continue to increase, and may eventually lead to the destruction of the bridge.

[0003] 2. Structural fatigue damage: Frequent and continuous vibrations may cause fatigue damage to the bridge structure. This damage will reduce the bearing capacity and durability of the bridge, and may affect the safety of the bridge in the long run.

[0004] 3. Discomfort for pedestrians and vehicles: Bridge vibration not only affects the stability of the structure, but may also cause discomfort to pedestrians and vehicles. Vibration may make the use of the bridge uncomfortable, affect the smoothness of traffic, and may even cause traffic accidents.

[0005] 4. Flutter risk: Flutter is a divergent self-excited vibration that occurs when wind speeds are high, which poses a huge threat to bridge safety. Flutter may cause serious damage to the bridge structure or even collapse.

[0006] 5. Vortex-induced vibration: Although vortex-induced vibration will not cause devastating damage to bridges like flutter, it is also one of the key points in bridge wind resistance design. Vortex-induced vibration may cause fatigue damage to related structures and cause discomfort to pedestrians and vehicles.

[0007] In summary, the harm of bridge beam vibration to structural stability is multifaceted, including possible structural damage, fatigue damage, reduced user comfort, and risks such as flutter and vortex-induced vibration. These are all issues that need to be considered and addressed in bridge design and maintenance.

[0008] Some devices and methods are also used in the prior art to reduce the vibration of the beam. For example, a bridge telescopic shock absorbing device with application number 2019108513022 includes a first plug plate, a second plug plate, a top rubber plate, a bottom rubber plate and a sliding assembly. The sliding assembly includes a first steel plate and a polytetrafluoroethylene plate arranged in sequence from top to bottom, and the first steel plate and the polytetrafluoroethylene plate can slide against each other. That is, by stacking multiple layers of rubber plates and setting the plates to slide, the effect of buffering and supporting can be achieved. However, when the wind force is extremely large and the wind speed is high, divergent self-excited vibration may occur. Simply stacking multiple layers of rubber plates and sliding cannot limit the accumulation and growth of divergent self-excited vibration, and its buffering performance and dissipated vibration energy are relatively limited. Summary of the invention

[0009] An object of the present invention is to solve at least the above problems and to provide at least the advantages which will be described hereinafter.

[0010] In order to achieve these purposes and other advantages according to the present invention, a steel trestle connection structure is provided, which is arranged at the expansion joint between the bridge decks of two adjacent spans of the steel trestle, or at the expansion joint between the two ends of the steel trestle and the corresponding abutments, and the steel trestle connection structure includes a plurality of connection units, each of which includes: A pair of connecting plates, the pair of connecting plates are arranged relatively and spaced apart, the connecting plates include a bottom plate, a transverse vertical plate arranged on the bottom plate, and two longitudinal vertical plates arranged relatively at two ends of the bottom plate; A pair of bottom elastic cushion layers, the pair of bottom elastic cushion layers are respectively laid on the opposite sides of the bottom plates of the pair of connecting plates; Two slide rails, the two slide rails are arranged on a pair of bottom elastic pads opposite to each other, and the two ends of each slide rail are arranged on the pair of bottom elastic pads along the longitudinal bridge direction, and a slider is provided on the slide rail, and there is a gap between the two ends of the slide rail and the longitudinal vertical plate on the corresponding side; A supporting frame, comprising a supporting plate arranged on the sliding block and two limiting plates arranged at two ends of the supporting plate opposite to each other along the transverse bridge direction; A sliding roller, the axial direction of which is limited along the transverse bridge direction and placed on the supporting plate, and is located between the two limiting plates; A pair of middle elastic pads, the pair of middle elastic pads are laid on both sides of the sliding roller along the transverse bridge direction and are located above the sliding rail, and the side walls of the middle elastic pads are in prestressed contact with the outer wall of the sliding roller; Two sets of tooth plates, the two sets of tooth plates are arranged oppositely on a pair of transverse vertical plates, and the two sets of tooth plates are arranged alternately, wherein when the sliding roller is located at the center of a pair of connecting plates, the lower surfaces of the two sets of tooth plates are in prestressed contact with the outer wall of the sliding roller, and there are gaps between two adjacent tooth plates, between the tooth plates and the opposite transverse vertical plates, and between the tooth plates and the corresponding longitudinal vertical plates; The arch-shaped gasket is sealed and filled in the gap between two adjacent tooth plates, between the tooth plate and the opposite transverse vertical plate, and between the tooth plate and the corresponding longitudinal vertical plate, wherein, when stationary, the upper surfaces of the arch-shaped gasket, the tooth plate, the longitudinal vertical plate and the transverse vertical plate are flush with the bridge deck of the steel trestle.

[0011] Preferably, the connection unit further comprises two groups of support strips, the support strips are arranged along the transverse bridge direction, the two groups of support strips are relatively arranged on two corresponding longitudinal vertical plates, and the middle elastic pad is laid on the support strips.

[0012] Preferably, a waist-shaped hole is opened in the transverse direction of the longitudinal vertical plate, and a pair of connecting holes is opened on the limiting plate. The pair of connecting holes on the limiting plate located at the same end are connected to the corresponding waist-shaped holes on the two longitudinal vertical plates through bolts and nuts, and the bolts are movably connected to the waist-shaped holes.

[0013] Preferably, the front end of the bottom of the tooth plate is flat, the middle part is curved, and the rear end is flat, and the rear end of the bottom of the tooth plate contacts the top surface of the middle elastic cushion layer.

[0014] Preferably, the connection unit further comprises two groups of connecting steel bars, the two groups of connecting steel bars are respectively arranged on the outer walls of the corresponding side transverse vertical plates, each group of connecting steel bars comprises a plurality of U-shaped bars, and the two ends of the U-shaped bars are fixed at vertical intervals.

[0015] Preferably, the ratio of the diameter of the sliding roller to the diameter of the middle arc surface of the tooth plate is 1:2-4.

[0016] Preferably, the bottom elastic pad layer, the middle elastic pad layer and the arch pad strip are made of rubber material, and the support plate and the sliding roller are made of polytetrafluoroethylene material.

[0017] Preferably, the surfaces of the support plate and the sliding roller are coated with graphite powder or talcum powder.

[0018] The present invention has at least the following beneficial effects: First, the steel trestle connection structure of the present invention is arranged at the expansion joint between the bridge decks of two adjacent spans of the steel trestle, or at the expansion joint between the two ends of the steel trestle and the corresponding abutments, which can allow the bridge to have a certain expansion and contraction displacement when temperature changes, settlement and the like occur under the influence of physical factors, thereby ensuring the safe operation of the bridge without causing damage to the auxiliary components.

[0019] Second, setting the slide rail on the bottom elastic cushion layer can provide vertical displacement space for the slide rail, that is, the slide rail can be vertically displaced under the drive of the bottom elastic cushion layer, and then the transverse displacement space provided by the slide rail itself to the slider is superimposed, then the slider can be vertically and laterally displaced simultaneously or individually, providing support for the absorption and dissipation of subsequent vibration responses.

[0020] Third, the sliding roller can not only respond to the simultaneous or separate vertical and lateral displacement transmission brought by the pallet, but also form a rolling displacement form with the pallet, which occurs when certain stress conditions are met. For example, when the wind force is extremely strong and the wind speed is high, divergent self-excited vibration may occur. On the basis of the vertical and lateral displacement absorption of the bottom elastic cushion, slide rail, slider and pallet, the rolling and sliding between the sliding roller and the pallet are used to change and destroy some inherent and regular vibrations. The main purpose is to change the vibration frequency and vibration amplitude, so that the self-excited vibration cannot continue to accumulate and grow, thereby reducing the damage of the self-excited vibration to the bridge structure and achieving the purpose of ensuring the safety of the bridge. At the same time, it also reduces the vibration of the bridge deck and improves driving stability.

[0021] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic diagram of the position layout of the steel trestle connection structure according to one of the technical solutions of the present invention; Figure 2 A top view of the connecting unit according to one of the technical solutions of the present invention; Figure 3 A top view of the support frame according to one of the technical solutions of the present invention; Figure 4 A schematic diagram of the side structure of the connecting unit according to one of the technical solutions of the present invention; Figure 5 This is a schematic diagram of the side structure of the tooth plate according to one of the technical solutions of the present invention.

[0023] Explanation of the numbers in the drawings in the specification: expansion joint 100, connecting unit 200, connecting plate 1, bottom plate 11, transverse vertical plate 12, longitudinal vertical plate 13, bottom elastic pad 2, slide rail 3, slider 4, support frame 5, support plate 51, limit plate 52, sliding roller 6, middle elastic pad 7, tooth plate 8, bow-shaped pad 9, supporting strip plate 14, waist-shaped hole 15, connecting steel rod 16. DETAILED DESCRIPTION

[0024] The present invention is further described in detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0025] It should be noted that the experimental methods described in the following embodiments are conventional methods unless otherwise specified, and the reagents and materials are commercially available unless otherwise specified; in the description of the present invention, the orientation or positional relationship indicated by the terms is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply 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.

[0026] like Figures 1 to 5 As shown, the present invention provides a steel trestle connection structure, which is arranged at the expansion joint 100 between the bridge decks of two adjacent spans of the steel trestle, or at the expansion joint 100 between the two ends of the steel trestle and the corresponding abutments, and can allow the bridge to have a certain expansion and contraction displacement when temperature changes, settlement and the like occur under the influence of physical factors, thereby ensuring the safe operation of the bridge without causing damage to the attached components.

[0027] The steel trestle bridge connection structure includes a plurality of connection units 200. According to the width of the bridge deck, an appropriate number of connection units 200 are set, and a plurality of connection units 200 are sequentially laid along the length direction (i.e., the transverse direction of the bridge) of the expansion joint 100 to form a steel trestle bridge connection structure. The requirements of bridges of different widths can be met.

[0028] Each connection unit 200 comprises: A pair of connecting plates 1 are arranged at a relatively spaced interval, and are respectively used to fix the two adjacent spans of the steel trestle, or to fix the abutment and one end of the steel trestle. The steel bars can be welded, tied, anchored, etc. to the embedded steel bars at the expansion joint 100, and then a steel plate flush with the bridge deck is laid and fixed between the opposite side of the connecting plate 1 and the corresponding side bridge deck.

[0029] The connecting plate 1 includes a bottom plate 11, a transverse vertical plate 12 arranged on the bottom plate 11, and two longitudinal vertical plates 13 arranged at both ends of the bottom plate 11; the connecting plate 1 serves to connect with the beam body of the steel trestle to transfer the telescopic displacement of the beam body of the steel trestle to the connecting unit 200 for absorption and relief.

[0030] A pair of bottom elastic pads 2, a pair of bottom elastic pads 2 are laid on the opposite sides of the bottom plates 11 of a pair of connecting plates 1; the bottom elastic pads 2 are used to absorb the vertical vibration response of the bridge beam body due to vehicle loads (or other factors, such as external wind force), thereby improving the stability of driving. The bottom elastic pad 2 can be made of rubber material, which has the advantages of excellent elastic-plastic hysteresis deformation and energy dissipation. Specifically, although some adhesive can be used to fix the bottom of the bottom elastic pad 2 to the upper surface of the bottom plate 11 during laying, in order to reduce the separation of the bottom elastic pad 2 from the bottom plate 11 during later use, on the opposite side of the bottom plate 11, separated from the horizontal vertical plate 12, a long strip-shaped baffle is protruded upward and arranged along the horizontal bridge direction to resist the side wall of the bottom elastic pad 2, so that it is not easy to separate from the bottom plate 11, and the upper surface of the baffle is lower than the upper surface of the bottom elastic pad 2.

[0031] Two slide rails 3 are arranged on a pair of bottom elastic pads 2 opposite to each other, and the two ends of each slide rail 3 are arranged on a pair of bottom elastic pads 2 along the longitudinal bridge direction. A slider 4 is provided on the slide rail 3 for sliding, and there is a gap between the two ends of the slide rail 3 and the longitudinal vertical plate 13 on the corresponding side; the slider 4 can move longitudinally along the bridge deck along the slide rail 3. The slide rail 3 is arranged on the bottom elastic pad 2, which can provide a vertical displacement space for the slide rail 3, that is, the slide rail 3 can be vertically displaced under the drive of the bottom elastic pad 2, and the transverse bridge displacement space provided by the slide rail 3 itself to the slider 4 is superimposed, so the slider 4 can be simultaneously or individually displaced vertically and transversely, providing support for the absorption and dissipation of subsequent vibration responses.

[0032] The support frame 5 includes a support plate 51 disposed on the slider 4 and two limit plates 52 disposed at both ends of the support plate in a transverse direction. Driven by the slider 4, the support plate 51 can also move vertically and horizontally at the same time or individually to provide support for the absorption and dissipation of subsequent vibration responses. When the support plate 51 moves, the distance between it and the horizontal vertical plates 12 on both sides will change.

[0033] The sliding roller 6 is placed on the support plate 51 with its axial direction limited along the transverse direction of the bridge, and is located between the two limiting plates 52; when the support plate 51 moves, the sliding roller 6 can be driven to move, thereby also changing the distance between the sliding roller 6 and the transverse vertical plates 12 on both sides. The sliding roller 6 can not only respond to the simultaneous or separate vertical and transverse displacement transmission brought by the support plate 51, but also form a rolling displacement form with the support plate 51, and the rolling displacement form needs to meet certain stress conditions. For example, when the wind force is extremely large and the wind speed is high, divergent self-excited vibration may occur. On the basis of the vertical and transverse displacement absorption of the bottom elastic cushion layer 2, the slide rail 3, the slider 4 and the support plate 51, the rolling and sliding between the sliding roller 6 and the support plate 51 are used to change and destroy some inherent and regular vibrations, which mainly change the vibration frequency and vibration amplitude, so that the self-excited vibration cannot continue to accumulate and grow, thereby reducing the damage of the self-excited vibration to the bridge structure, achieving the purpose of ensuring the safety of the bridge, and at the same time, reducing the vibration of the bridge deck and improving the driving stability.

[0034] A pair of intermediate elastic pads 7 are laid on both sides of the sliding roller 6 along the transverse direction of the bridge and are located above the slide rail 3. The side walls of the intermediate elastic pads 7 are prestressed against the outer wall of the sliding roller 6. The intermediate elastic pads 7 are located between the sliding roller 6 and the corresponding side transverse vertical plate 12. When the distance between the sliding roller 6 and the transverse vertical plate 12 changes, the interaction force between the intermediate elastic pads 7 and the intermediate elastic pads 7 will be squeezed (increased) or relaxed (reduced), but a certain prestress of mutual abutment is always maintained between the two. For example, when the beam body generates vertical and transverse vibration responses due to vehicle loads, it is transmitted to the transverse vertical plate 12, the transverse vertical plate 12 squeezes the intermediate elastic pads 7, and the intermediate elastic pads 7 squeezes the sliding roller 6, which will cause the sliding roller 6 to produce vertical and transverse displacements, but the displacement is also carried out under limit, so as to absorb these vibrations and make the bridge deck more stable. The intermediate elastic pads 7 can be specifically made of rubber material. Only when a pair of intermediate elastic pads 7 are provided to limit the sliding roller 6 and there is elastic space for making way, can the displacement transmitted by the bottom elastic pad 2 and other components be effectively received and responded to, and when the vibration amplitude or frequency does not reach a certain intensity, the sliding roller 6 will not roll.

[0035] Two groups of tooth plates 8 are arranged on a pair of transverse vertical plates 12 in a relative manner, and the two groups of tooth plates 8 are arranged in a staggered manner. When the sliding roller 6 is located at the center of a pair of connecting plates 1, the lower surfaces of the two groups of tooth plates 8 are prestressed against the outer wall of the sliding roller 6. There are gaps between two adjacent tooth plates 8, between the tooth plates 8 and the opposite transverse vertical plates 12, and between the tooth plates 8 and the corresponding longitudinal vertical plates 13. Under the action of the tooth plates 8, the upward displacement of the sliding roller 6 is slight, so the upward displacement of the bridge can be limited. At the same time, when the tooth plates 8 are arranged in a staggered manner, the two groups of tooth plates 8 can move toward each other by a certain distance, thereby absorbing a part of the displacement of the bridge beam, reducing the vibration and displacement of the bridge deck, and improving driving stability.

[0036] The arched pad 9 is sealed and filled in the gap between two adjacent tooth plates 8, between the tooth plate 8 and the opposite transverse vertical plate 12, and between the tooth plate 8 and the corresponding longitudinal vertical plate 13, wherein, when stationary, the upper surfaces of the arched pad 9, the tooth plate 8, the longitudinal vertical plate 13 and the transverse vertical plate 12 are flush with the bridge deck of the steel trestle. The arched pad 9 can buffer and absorb the displacement of the tooth plate 8, improve the stability of the bridge, and also has a sealing effect to prevent debris from entering the surrounding space of the sliding roller 6 and causing failure. The arched pad 9 can be specifically made of rubber material.

[0037] In the above technical scheme, by setting up a steel trestle connection structure, it is possible to allow the bridge to have a certain expansion and contraction displacement when temperature changes, settlement and other phenomena occur under the influence of physical factors, thereby ensuring the safe operation of the bridge without causing damage to the attached components. When a vehicle passes through the expansion gap, the beam in the expansion joint will produce vertical and lateral vibration responses due to the vehicle load. The steel trestle connection structure of this scheme absorbs and slows down these vibrations through the bottom elastic pad 2, the sliding roller 6 and the middle elastic pad 7, thereby ensuring the smooth passage of the vehicle. When two vehicles pass through the expansion joint at the same time, especially when driving in the opposite direction, the maximum horizontal displacement of the beam in the expansion joint will increase, while the influence of the vertical displacement is relatively small. The setting of the sliding roller 6, the middle elastic pad 7 and the tooth plate 8 of this scheme can cooperate to absorb and transform, thereby reducing the maximum horizontal displacement of the beam. This scheme can achieve adaptation to bridge deformation and buffering of vehicle loads, ensuring the safety of the bridge and the smooth passage of vehicles.

[0038] In another technical solution, the connection unit 200 further includes two groups of support strips 14, the support strips 14 are arranged along the transverse bridge direction, the two groups of support strips 14 are relatively arranged on the corresponding two longitudinal vertical plates 13, and the middle elastic pad 7 is laid on the support strips 14. The influence of the middle elastic pad 7 on the slide rail 3 is reduced, so as to facilitate the rolling and movement of the sliding roller 6 to absorb the horizontal movement potential energy.

[0039] In another technical solution, a waist-shaped hole 15 is opened on the longitudinal vertical plate 13 along the transverse direction of the bridge, and a pair of connecting holes is opened on the limiting plate 52. The pair of connecting holes on the limiting plate 52 at the same end are correspondingly connected to the waist-shaped holes 15 on the two longitudinal vertical plates 13 through bolts and nuts, and the bolts are movably connected to the waist-shaped holes 15. For expansion joints of different widths, it can be slidably adjusted to an appropriate width, and is suitable for a wider range of bridges.

[0040] In another technical solution, the front end of the bottom of the tooth plate 8 is flat, the middle part is curved, and the rear end is flat. The rear end of the bottom of the tooth plate 8 contacts the top surface of the middle elastic cushion layer 7. When vertical displacement occurs, it can be smoother, and at the same time, part of the potential energy can be converted to the horizontal direction, which significantly improves the driving stability. Specifically, the ratio of the diameter of the sliding roller 6 to the diameter of the curved middle part of the tooth plate 8 can be set to 1:2~4.

[0041] In another technical solution, the connection unit 200 also includes two groups of connecting steel bars 16. The two groups of connecting steel bars are respectively arranged on the outer walls of the corresponding side transverse vertical plates 12. Each group of connecting steel bars includes a plurality of U-shaped bars, and the two ends of the U-shaped bars are fixed along the vertical intervals. The use of U-shaped bars is convenient for binding and welding with the embedded steel bars on the bridge. The use of U-shaped bars for fixing can improve the lateral stiffness, facilitate operation during construction, and simple installation and removal operations, which greatly reduces the labor intensity and operation time of workers. After the connecting steel bars are installed and fixed, the steel plate is laid and fixed on the top of the connecting steel bars by welding or other means, flush with the bridge deck, so that vehicles can pass. The upper surface of the steel plate is also provided with anti-slip protrusions like the bridge deck of the steel trestle.

[0042] In another technical solution, the support plate 51 and the sliding roller 6 are made of polytetrafluoroethylene. Polytetrafluoroethylene (PTFE) has extremely high chemical stability and can resist corrosion from almost all chemical substances, including strong acids, strong alkalis and organic solvents. It can remain stable over a wide temperature range, and the long-term use temperature range is -200°C to +260°C. The friction coefficient is low, about 0.05. Specifically, the surface of the support plate 51 and the sliding roller 6 is coated with graphite powder or talcum powder. The friction coefficient can be further reduced and the durability can be improved.

[0043] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes, and they can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A steel trestle connection structure, which is arranged at the expansion joint between the bridge decks of two adjacent spans of the steel trestle, or at the expansion joint between the two ends of the steel trestle and the corresponding abutments, characterized in that: The steel trestle connection structure includes a plurality of connection units, each of which includes: A pair of connecting plates, the pair of connecting plates are arranged relatively and spaced apart, the connecting plates include a bottom plate, a transverse vertical plate arranged on the bottom plate, and two longitudinal vertical plates arranged relatively at two ends of the bottom plate; A pair of bottom elastic cushion layers, the pair of bottom elastic cushion layers are respectively laid on the opposite sides of the bottom plates of the pair of connecting plates; Two slide rails, the two slide rails are arranged on a pair of bottom elastic pads opposite to each other, and the two ends of each slide rail are arranged on the pair of bottom elastic pads along the longitudinal bridge direction, and a slider is provided on the slide rail, and there is a gap between the two ends of the slide rail and the longitudinal vertical plate on the corresponding side; A supporting frame, comprising a supporting plate arranged on the sliding block and two limiting plates arranged at two ends of the supporting plate opposite to each other along the transverse bridge direction; A sliding roller, the axial direction of which is limited along the transverse bridge direction and placed on the supporting plate, and is located between the two limiting plates; A pair of middle elastic pads, the pair of middle elastic pads are laid on both sides of the sliding roller along the transverse bridge direction and are located above the sliding rail, and the side walls of the middle elastic pads are in prestressed contact with the outer wall of the sliding roller; Two sets of tooth plates, the two sets of tooth plates are arranged oppositely on a pair of transverse vertical plates, and the two sets of tooth plates are arranged alternately, wherein when the sliding roller is located at the center of a pair of connecting plates, the lower surfaces of the two sets of tooth plates are in prestressed contact with the outer wall of the sliding roller, and there are gaps between two adjacent tooth plates, between the tooth plates and the opposite transverse vertical plates, and between the tooth plates and the corresponding longitudinal vertical plates; The arch-shaped gasket is sealed and filled in the gap between two adjacent tooth plates, between the tooth plate and the opposite transverse vertical plate, and between the tooth plate and the corresponding longitudinal vertical plate, wherein, when stationary, the upper surfaces of the arch-shaped gasket, the tooth plate, the longitudinal vertical plate and the transverse vertical plate are flush with the bridge deck of the steel trestle.

2. The steel trestle connection structure according to claim 1, characterized in that: The connection unit further comprises two groups of support strips, which are arranged along the transverse bridge direction, and the two groups of support strips are arranged on two corresponding longitudinal vertical plates relatively, and the middle elastic cushion layer is laid on the support strips.

3. The steel trestle connection structure according to claim 1, characterized in that: The longitudinal vertical plate is provided with a waist-shaped hole in the transverse direction, and the limiting plate is provided with a pair of connecting holes. The pair of connecting holes on the limiting plate at the same end are connected with the waist-shaped holes on the two longitudinal vertical plates through bolts and nuts, and the bolts are movably connected with the waist-shaped holes.

4. The steel trestle connection structure according to claim 1, characterized in that: The front end of the bottom of the tooth plate is flat, the middle part is curved, and the rear end is flat. The rear end of the bottom of the tooth plate contacts the top surface of the middle elastic cushion layer.

5. The steel trestle connection structure according to claim 1, characterized in that: The connection unit also includes two groups of connection steel bars, which are respectively arranged on the outer walls of the corresponding side transverse vertical plates. Each group of connection steel bars includes a plurality of U-shaped bars, and the two ends of the U-shaped bars are fixed at vertical intervals.

6. The steel trestle connection structure according to claim 4, characterized in that: The ratio of the diameter of the sliding roller to the diameter of the middle arc surface of the tooth plate is 1:2-4.

7. The steel trestle connection structure according to claim 1, characterized in that: The bottom elastic pad layer, the middle elastic pad layer and the arch pad strip are made of rubber material, and the support plate and the sliding roller are made of polytetrafluoroethylene material.

8. The steel trestle connection structure according to claim 7, characterized in that: The surfaces of the support plate and the sliding roller are coated with graphite powder or talcum powder.

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