Transformation device for existing T-beam anti-falling beam mechanism
By adopting a U-shaped elastic connecting plate structure in the anti-fall beam device, and utilizing the flexible damping effect of U-shaped steel, the problems of large impact force, large weight, high cost and poor matching of existing anti-fall beam devices are solved, achieving a more efficient anti-fall beam and vibration reduction effect.
Patent Information
- Application Number
- CN202520027394.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-07
- Publication Date
- 2026-02-17
- Estimated Expiration
- 2035-01-07
AI Technical Summary
Existing anti-fall beam devices adopt a strength-based design concept, resulting in problems such as large impact force, increased structural weight, large space requirements, high cost, and poor compatibility with seismic isolation bearings.
The structure uses a U-shaped elastic connecting plate to restrict beam displacement through flexible connection. The damping effect generated by the U-shaped steel under external force limits the beam's fall.
It realizes the design concept of overcoming rigidity with flexibility, improves the ability to prevent beams from falling off, reduces impact force, reduces structural weight and cost, and at the same time has the effect of vibration reduction and isolation.
Smart Images
Figure CN223922019U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of bridge anti-falling beams, and in particular to a modification device for an existing T-beam anti-falling beam mechanism. Background Technology
[0002] When a bridge structure is subjected to external forces (such as earthquakes, wind, or vehicle impacts), the beams will shift on the supporting structure. To prevent the beams from falling due to displacement, an anti-fall beam structure is installed between the beams and the abutments to limit the displacement of the beams.
[0003] Currently, the main structures for anti-falling beam devices in China are block-type and cable-type. Block-type anti-falling beam devices are installed between the beam and the pier to prevent lateral or longitudinal displacement of the beam under loads such as seismic forces. During installation, they are connected to pre-embedded anti-falling beam blocks and are typically installed next to the supports, close to the centerline of the bridge. They are suspended because they are only for preventing lateral or longitudinal displacement of the beam and are not load-bearing structures. Cable-type anti-falling beam devices consist of cable chains and connecting rods. The cable chains connect the main beam to the pier, limiting the maximum horizontal displacement of the upper beam and preventing it from falling. The slits on the surface of the connecting rods absorb some seismic energy through tensile deformation, reducing damage to other bridge components.
[0004] Whether it is a block-type or cable-stayed anti-fall beam structure, both adopt the concept of strength design, namely "hard against hard", to solve the problem of anti-fall beam. This type of anti-fall beam has the following shortcomings: large impact force, increased structural weight, large space, high cost, and poor matching with seismic isolation bearings.
[0005] Therefore, a device is needed to modify the existing T-beam anti-fall mechanism to solve the above problems. Summary of the Invention
[0006] This utility model aims to address the problems of existing anti-fall beam structures, whether block-type or cable-stayed, which all employ a strength-based design approach, i.e., a "hard-on-hard" method. These anti-fall beams suffer from drawbacks such as high impact force, increased structural weight, large space requirements, high cost, and poor compatibility with seismic isolation supports. This utility model provides a modification device for existing T-beam anti-fall beam mechanisms, thus solving these problems.
[0007] This utility model provides a modification device for an existing T-beam anti-fall mechanism, including two first connecting plates, two second connecting plates, several third connecting plates, several fourth connecting plates, and several U-shaped elastic elements. The second and fourth connecting plates are provided with horizontal installation structures. The first connecting plates are set on the bottom surface of the beam at the connection position between the beam and the two abutments. The two second connecting plates are set on the sides of the two abutments along the bridge direction. The first and second connecting plates are connected by U-shaped elastic elements. The third connecting plates are set on the bottom surface of the beam end at the pier position, connecting the lower surfaces of the ends of two adjacent beams. The fourth connecting plates are set on the sides of the pier along the bridge direction. The third and fourth connecting plates are connected by U-shaped elastic elements, which are horizontally placed U-shaped sheet structures.
[0008] In a preferred embodiment of the existing T-beam anti-fall mechanism modification device described in this utility model, the first connecting plate is a plate-shaped structure that is fastened to the bottom surface of the bridge abutment by bolts, and the bottom surface of the first connecting plate is connected to the top surface of a U-shaped elastic element.
[0009] In a preferred embodiment of the existing T-beam anti-fall mechanism modification device described in this utility model, the second connecting plate includes a second vertical plate and a second horizontal plate. The second vertical plate is arranged vertically, and the second horizontal plate is arranged horizontally. The second vertical plate and the second horizontal plate are fixedly connected in an L-shape. The second vertical plate is fastened to the upper side surface of the bridge abutment, and the upper surface of the second horizontal plate is connected to the bottom surface of a U-shaped elastic element.
[0010] In a preferred embodiment of the existing T-beam anti-fall mechanism modification device of this utility model, the third connecting plate includes a pair of third limiting plates, a pair of supporting vertical plates, and a third bottom plate. The third bottom plate is a long strip-shaped horizontal plate structure. The third limiting plates are a pair of opposing vertical plates. The third limiting plates are set perpendicular to the length direction of the third bottom plate. The supporting vertical plates are vertically set on the two third limiting plates on the upper surface of the third bottom plate. The two vertical ends of the supporting vertical plates are connected to the inner side plates of the third limiting plates. The third limiting plates and the supporting vertical plates are at the same height. The supporting vertical plates are perpendicular to the third limiting plates and the third bottom plate. The distance between the two supporting vertical plates is less than the length of the third limiting plates. The width of the third limiting plates is equal to the length of the third bottom plate. The two sections of the third bottom plate set on the outer side of the third limiting plates are respectively fastened to the bottom surfaces of two adjacent beams. The distance between the two third limiting plates is equal to the distance between the lower vertical edges of the two adjacent beams. Two U-shaped elastic elements are set on the lower surface of the third bottom plate between the two third limiting plates and between the two supporting vertical plates. The openings of the U-shaped elastic elements set on the lower surface of the third bottom plate are opposite each other.
[0011] In a preferred embodiment of the existing T-beam anti-fall mechanism modification device described in this utility model, the fourth connecting plate includes a fourth vertical plate and a fourth horizontal plate. The fourth vertical plate is arranged vertically, and the fourth horizontal plate is arranged horizontally. The fourth vertical plate and the fourth horizontal plate are fixedly connected in an L-shape. The fourth vertical plate is fastened to the middle side surface of the upper end of the pier. The upper surface of the second horizontal plate is connected to the bottom surface of a pair of U-shaped elastic members, and the openings of the two U-shaped elastic members are opposite to each other.
[0012] When the bridge beam shifts, the force is transferred to the U-shaped steel through the anchor bolts, and then the U-shaped steel transfers the force to the abutments and piers to limit the displacement of the bridge beam. The flexibility of the U-shaped steel is such that when the bridge is prone to collapse due to an earthquake or external disaster, the U-shaped steel extends along the opening direction to hold the bridge beam in place and prevent it from falling.
[0013] The beneficial effects of this utility model are as follows:
[0014] (1) Adopting the design concept of "using softness to overcome hardness" to replace the traditional anti-fall beam "hard impact" strength to improve the anti-fall capability of railway bridges;
[0015] (2) Unlike traditional anti-fall beams, U-shaped steel damping anti-fall beams have similar stress under different pier heights and have seismic isolation and reduction effects under seismic waves, which are more obvious at higher ground intensity.
[0016] (3) U-shaped steel is a flexible connection. It has a damping effect before entering the beam dropping state, which can greatly reduce the impact. Therefore, the embedded parts are not easily damaged. Attached Figure Description
[0017] Figure 1 A schematic diagram of a modification device for an existing T-beam anti-fall mechanism.
[0018] Figure 2 A schematic diagram of a modification device for an existing T-beam anti-fall mechanism.
[0019] Figure 3 A schematic diagram of the second connecting plate of a modification device for an existing T-beam anti-fall mechanism.
[0020] Figure 4 A schematic diagram of the third connecting plate of a modification device for an existing T-beam anti-fall mechanism.
[0021] Figure 5 This is a schematic diagram of the fourth connecting plate of a modification device for an existing T-beam anti-fall mechanism.
[0022] Figure label:
[0023] 1. First connecting plate; 2. Second connecting plate; 21. Second vertical plate; 22. Second horizontal plate; 3. Third connecting plate; 31. Third limiting plate; 32. Supporting vertical plate; 33. Third base plate; 4. Fourth connecting plate; 41. Fourth vertical plate; 42. Fourth horizontal plate; 5. U-shaped elastic element. Detailed Implementation
[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Example 1
[0025] like Figures 1-2 As shown, a modification device for an existing T-beam anti-fall mechanism includes two first connecting plates 1, two second connecting plates 2, several third connecting plates 3, several fourth connecting plates 4, and several U-shaped elastic elements 5. The second connecting plates 2 and the fourth connecting plates 4 are provided with horizontal installation structures. The first connecting plates 1 are set on the bottom surface of the beam at the connection position between the beam and the two abutments. The two second connecting plates 2 are set on the sides of the two abutments along the bridge direction. The first connecting plates 1 and the second connecting plates 2 are connected by U-shaped elastic elements 5. The third connecting plates 3 are set on the bottom surface of the beam end at the pier position, connecting the lower surfaces of the ends of two adjacent beams. The fourth connecting plates 4 are set on the sides of the pier along the bridge direction. The third connecting plates 3 and the fourth connecting plates 4 are connected by U-shaped elastic elements 5, which are horizontally placed U-shaped plate structures.
[0026] The first connecting plate 1 is a plate-shaped structure that is fastened to the bottom of the bridge abutment by bolts. The bottom of the first connecting plate 1 is connected to the top of a U-shaped elastic element 5.
[0027] like Figure 3 As shown, the second connecting plate 2 includes a second vertical plate 21 and a second horizontal plate 22. The second vertical plate 21 is arranged vertically, and the second horizontal plate 22 is arranged horizontally. The second vertical plate 21 and the second horizontal plate 22 are fixedly connected in an L-shape. The second vertical plate 21 is fastened to the upper side surface of the bridge abutment, and the bottom surface of a U-shaped elastic member 5 is connected to the upper surface of the second horizontal plate 22.
[0028] like Figure 4 As shown, the third connecting plate 3 includes a pair of third limiting plates 31, a pair of supporting vertical plates 32, and a third base plate 33. The third base plate 33 is a long strip-shaped horizontal plate structure. The third limiting plates 31 are a pair of opposing vertical plates, which are arranged perpendicular to the length direction of the third base plate 33. The supporting vertical plates 32 are vertically arranged on the two third limiting plates 31 on the upper surface of the third base plate 33. The two vertical ends of the supporting vertical plates 32 are connected to the inner side surfaces of the third limiting plates 31. The third limiting plates 31 and the supporting vertical plates 32 are at the same height, and the supporting vertical plates 32 are perpendicular to the third limiting plates 31. The distance between the plate 31 and the third base plate 33, and the distance between the two supporting vertical plates 32 is less than the length of the third limiting plate 31. The third limiting plate 31 and the third base plate 33 are of equal width and length. The two sections of the third base plate 33 located on the outside of the third limiting plate 31 are respectively fastened to the bottom surfaces of the two adjacent beams. The distance between the two third limiting plates 31 is equal to the distance between the lower vertical edges of the two adjacent beams. Two U-shaped elastic elements 5 are located on the lower surface of the third base plate 33 between the two third limiting plates 31 and between the two supporting vertical plates 32. The openings of the U-shaped elastic elements 5 located on the lower surface of the third base plate 33 are opposite to each other.
[0029] like Figure 5As shown, the fourth connecting plate 4 includes a fourth vertical plate 41 and a fourth horizontal plate 42. The fourth vertical plate 41 is arranged vertically, and the fourth horizontal plate 42 is arranged horizontally. The fourth vertical plate 41 and the fourth horizontal plate 42 are fixedly connected in an L-shape. The fourth vertical plate 41 is fastened to the middle side surface of the upper end of the pier. The bottom surface of a pair of U-shaped elastic members 5 is connected to the upper surface of the second horizontal plate 22, and the openings of the two U-shaped elastic members 5 are opposite to each other.
[0030] The anti-fall beam device consists of connecting steel plates and U-shaped steel sections. The U-shaped steel sections transfer the horizontal force generated by the beam displacement to the piers or abutments, limiting the beam displacement. Under normal operating conditions, the U-shaped steel section only bears vertical forces, not horizontal forces. Under seismic loading, the U-shaped steel section rolls in a track-like manner, generating damping. When the beam displacement exceeds the design value of the damping displacement, the U-shaped anti-fall beam device transforms into an anti-fall beam tie rod, effectively preventing the beam from falling. It thus combines the dual functions of seismic isolation and anti-fall beam measures. Oval holes and limiting slots can also be installed at the openings on the upper plate of the U-shaped steel section to release lateral temperature displacement generated by the bridge.
[0031] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.
Claims
1. A retrofit device for a fall prevention mechanism of an existing T-beam, characterized in that: The utility model provides a bridge pier and abutment connecting structure, including two first connecting plate (1), two second connecting plate (2), a plurality of third connecting plate (3), a plurality of fourth connecting plate (4) and a plurality of U type elastic piece (5), second connecting plate (2) and fourth connecting plate (4) are provided with horizontal installation structure, first connecting plate (1) is arranged at the beam body bottom surface of the bridge pier and two abutment connecting position, two second connecting plate (2) are arranged at two bridge pier bridge -toward side surface, first connecting plate (1) and second connecting plate (2) are connected through U type elastic piece (5), third connecting plate (3) is arranged at the beam body end bottom surface of bridge pier position, connects two adjacent beam body end lower surface, fourth connecting plate (4) is arranged at the bridge pier bridge -toward side surface, between third connecting plate (3) and fourth connecting plate (4) is connected through U type elastic piece (5), U type elastic piece (5) is the U type sheet structure of transverse arrangement.
2. The retrofit device for preventing the falling of a T-beam according to claim 1, characterized in that: First connecting plate (1) is the plate structure through bolt fastening in the abutment bottom surface, first connecting plate (1) bottom surface connects one U type elastic piece (5) top surface.
3. The retrofit device for an existing T-beam anti-drop mechanism according to claim 1, characterized in that: Second connecting plate (2) includes second vertical plate (21) and second horizontal plate (22), second vertical plate (21) is vertically arranged, and second horizontal plate (22) is horizontally arranged, and second vertical plate (21) and second horizontal plate (22) are fixedly connected in L type, and second vertical plate (21) is fastened on the upper end side surface of the abutment, and the upper surface of second horizontal plate (22) is connected with the bottom surface of one U type elastic piece (5).
4. The retrofit device for an existing T-beam anti-drop mechanism according to claim 1, characterized in that: Third connecting plate (3) includes a pair of third limiting plate (31), a pair of supporting vertical plate (32) and third bottom plate (33), third bottom plate (33) is strip-shaped horizontal plate structure, third limiting plate (31) is a pair of opposite vertical plate, third limiting plate (31) is arranged perpendicularly to the length direction of third bottom plate (33), supporting vertical plate (32) is vertically arranged on the upper surface of third bottom plate (33) two third limiting plate (31), the two vertical ends of supporting vertical plate (32) are arranged to connect the inner plate surface of third limiting plate (31), third limiting plate (31) and supporting vertical plate (32) are equal height, supporting vertical plate (32) is perpendicular to third limiting plate (31) and third bottom plate (33), the spacing of two supporting vertical plate (32) is less than the length of third limiting plate (31), third limiting plate (31) and third bottom plate (33) are equal length, third bottom plate (33) is arranged at the outer side of two third limiting plate (31) respectively fastening the bottom surface of adjacent two beam bodies, the spacing of two third limiting plate (31) is equal to the vertical edge spacing of the lower end of adjacent two beam bodies, two U type elastic piece (5) are arranged on the lower surface of third bottom plate (33) between two third limiting plate (31) and two supporting vertical plate (32), and the opening of U type elastic piece (5) arranged on the lower surface of third bottom plate (33) is opposite.
5. The retrofit device for an existing T-beam anti-drop mechanism according to claim 3, characterized in that: The fourth connecting plate (4) comprises a fourth vertical plate (41) and a fourth horizontal plate (42), the fourth vertical plate (41) is vertically arranged, the fourth horizontal plate (42) is horizontally arranged, the fourth vertical plate (41) and the fourth horizontal plate (42) are fixedly connected in an L shape, the fourth vertical plate (41) is fastened to the middle side surface of the upper end of the pier, and the upper surface of the second horizontal plate (22) is connected with the bottom surfaces of a pair of U-shaped elastic members (5); the openings of the two U-shaped elastic members (5) are opposite.