Intercity railway viaduct box girder bottom occlusion tooth-groove-shaped anti-seismic protection safety device
By designing occlusion-shaped shear grooves and shear pins at the bottom of the box girder of the intercity railway viaduct, the problems of brittle damage and brittle shearing of traditional concrete anti-fall beam devices during earthquakes are solved, and the safety and seismic resistance of the anti-fall beams are improved.
Patent Information
- Application Number
- CN202421601171.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-08
- Publication Date
- 2025-05-27
- Estimated Expiration
- 2034-07-08
AI Technical Summary
Traditional concrete anti-fall beam installations are prone to brittle damage and brittle shearing during earthquakes, resulting in falling beams and pose safety hazards.
A safety device for seismic protection of the anti-slot of the bottom of the box girder of the intercity railway viaduct is designed. By setting a occlusion-shaped shear groove between the anti-slot device and the main beam and a shear pin in the middle, it is designed to prevent brittle shearing of the anti-slot beam during earthquakes.
It effectively prevents brittle shearing of anti-fall beams during earthquakes, reduces earthquake damage and losses, and ensures the earthquake safety of the bridge.
Smart Images
Figure CN222908515U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of anti-seismic and disaster prevention engineering for rail transit, and particularly relates to an anti-seismic protection safety device with occluding tooth grooves at the bottom of a box girder of an intercity railway viaduct. Background Art
[0002] The existing anti-seismic and anti-drop beam devices mainly include integral concrete blocks, sliding concrete blocks, rubber buffer blocks, energy-dissipating steel blocks, energy-dissipating SMA blocks, and double-layer block structures, with integral concrete blocks being the main type. Therefore, their seismic damage mainly occurs due to the concrete failure mechanism or the shearing of shear connectors, namely diagonal shear failure and flat shear failure.
[0003] The reason for the above problems is that traditional concrete anti-drop beam devices will undergo brittle failure. When the force is too large, the instantaneous impact force of the beam will cause the anti-drop beam to be brittlely sheared off and directly drop the beam, which is extremely dangerous.
[0004] Therefore, how to prevent the drop of the beam caused by seismic damage and ensure the anti-seismic performance and safety of rail transit remains an urgent problem to be solved. Summary of the Utility Model
[0005] Aiming at the problem that the above-mentioned traditional concrete anti-drop beam device is prone to brittle failure and is prone to brittle shearing and dropping of the beam when the seismic force is too large, the utility model provides an occluding shear tooth groove at the bottom of a rail transit box girder. An anti-seismic and anti-drop beam device is provided with an occluding shear tooth groove between the anti-drop beam device and the main beam, and shear pins are arranged in the middle, which can prevent the drop of the beam caused by the brittle shearing of the anti-drop beam during an earthquake. The specific technical solutions are as follows:
[0006] An anti-seismic protection safety device with occluding tooth grooves at the bottom of a box girder of an intercity railway viaduct, comprising an anti-drop beam concrete block, a box girder, shear pins, and a sawtooth block ear wall; the box girder is arranged on a pier, and the anti-drop beam concrete block, shear pins, and sawtooth block ear wall are arranged at the bottom of the box girder and on both sides of the pier, used for consuming seismic kinetic energy, restricting the displacement of the box girder, and preventing the drop of the beam.
[0007] For the anti-seismic protection safety device with occluding tooth grooves at the bottom of a box girder of an intercity railway viaduct described above, the anti-drop beam concrete block and the sawtooth block ear wall are integrally formed, the sawtooth block ear wall is located above the anti-drop beam concrete block, forming a shear key tooth shape; a shear key groove matching the shear key teeth of the sawtooth block ear wall is provided on the bottom surface of the box girder, and the two are matched and embedded.
[0008] Preferably, for the anti-seismic protection safety device with occluding tooth grooves at the bottom of the box girder of the intercity railway viaduct mentioned above, the shear pin is arranged in a matching manner with the ear wall of the sawtooth block; it is an inverted T-shaped structural member, including a horizontal nail section and a vertical nail section; and the horizontal nail section is embedded in the anti-falling beam concrete block, and the vertical nail section is embedded in the shear key tooth of the ear wall of the sawtooth block and extends out of the shear key tooth to contact the box girder, fixing the anti-falling beam concrete block and the ear wall of the sawtooth block at the bottom of the box girder.
[0009] More preferably, for the anti-seismic protection safety device with occluding tooth grooves at the bottom of the box girder of the intercity railway viaduct mentioned above, there are no less than 2 ear walls of the sawtooth block on the anti-falling beam concrete block, and no less than four shear pins in the ear wall of the sawtooth block.
[0010] For the anti-seismic protection safety device with occluding tooth grooves at the bottom of the box girder of the intercity railway viaduct mentioned above, the specifications of the anti-falling beam concrete block and the height of the shear key tooth of the ear wall of the sawtooth block are determined according to the magnitude of the seismic force; the nail length of the shear pin is determined according to the height of the shear key tooth of the ear wall of the sawtooth block, and the diameter of the shear pin is determined according to the magnitude of the seismic force.
[0011] Preferably, for the anti-seismic protection safety device with occluding tooth grooves at the bottom of the box girder of the intercity railway viaduct mentioned above, the specifications of the anti-falling beam concrete block (1) are 0.3 - 0.8 m in length, 0.2 - 0.5 m in width, and 0.3 - 0.6 m in height, the height of the shear key tooth of the ear wall of the sawtooth block (4) is 40 - 60 mm, the nail length of the shear pin (3) is 50 - 80 mm, and the diameter of the shear pin (3) is 28 mm - 32 mm.
[0012] Preferably, for the anti-seismic protection safety device with occluding tooth grooves at the bottom of the box girder of the intercity railway viaduct mentioned above, the material of the shear pin is hot-rolled ribbed steel bar.
[0013] Advantages of the present utility model:
[0014] 1) The anti-seismic and anti-falling beam device of the present utility model reforms the traditional concrete anti-falling beam, that is, a sawtooth block ear wall design is carried out at the interface between the anti-falling beam and the main beam, so that the traditional interface seismic shear failure becomes a new circular arc ductile interface failure form along the sawtooth block ear wall, fully dissipating the seismic energy, reducing the seismic damage, minimizing the seismic loss, and ensuring the seismic safety of the bridge.
[0015] 2) The anti-seismic and anti-falling beam device of the present utility model is provided with occluding shear tooth grooves between the anti-falling beam and the main beam, and shear pins are arranged in the middle, which can prevent the brittle shear of the anti-falling beam during an earthquake, resulting in the falling of the beam. At the same time, the shear tooth grooves and shear pins of the anti-falling beam of the present technology both participate in seismic energy dissipation, consume the seismic energy, reduce the seismic damage, minimize the seismic loss, and have good practical value. Description of the drawings
[0016] Figure 1 Structural schematic diagram of the anti-seismic protection safety device with occluding tooth grooves at the bottom of the box girder of the intercity railway viaduct of the present utility model;
[0017] Figure 2 Structural detail diagram of the anti-seismic protection safety device with occluding tooth grooves at the bottom of the box girder of the intercity railway viaduct of the present utility model;
[0018] Figure 3 Transverse bridge direction anti-seismic schematic diagram of the present utility model;
[0019] Figure 4 Longitudinal bridge direction schematic diagram of the present utility model;
[0020] Figure 5 Force schematic diagram of the present utility model.
[0021] In the figure: 1, anti-falling beam concrete block; 2, box girder; 3, shear pin; 4, serrated block ear wall; 5, bridge pier. Specific implementation manner
[0022] To make the purpose, technical solutions and advantages of the present utility model clearer, the technical solutions of the present utility model will be clearly and completely described below in conjunction with the embodiments and the accompanying drawings. Embodiment
[0023] This embodiment is an anti-seismic protection safety device with occluding tooth grooves at the bottom of the box girder of the intercity railway viaduct, as Figures 1 to 5 shown, including an anti-falling beam concrete block 1, a shear pin 3 and a serrated block ear wall 4; the box girder 2 of the rail transit is arranged on the bridge pier 5, and the shear tooth groove anti-falling beam is arranged at the bottom of the box girder 2 and on both sides of the bridge pier 5, and is used for consuming seismic kinetic energy, restricting the displacement of the box girder 2 and preventing the falling of the beam.
[0024] In this embodiment, the anti-falling beam concrete block 1 and the serrated block ear wall 4 are integrally formed, and the serrated block ear wall 4 is located above the anti-falling beam concrete block 1 to form a shear key tooth shape; a shear key groove matching the shear key teeth of the serrated block ear wall 4 is provided on the bottom surface of the box girder 2, and the two are matched and embedded. The shear pin 3 is arranged in a matching manner with the serrated block ear wall 4; it is an inverted T-shaped structural member, including a horizontal nail section and a vertical nail section; and the horizontal nail section is embedded in the anti-falling beam concrete block 1, and the vertical nail section is embedded in the shear key teeth of the serrated block ear wall 4 and extends out of the shear key teeth to contact the box girder 2, fixing the anti-falling beam concrete block 1 and the serrated block ear wall 4 to the bottom of the box girder 2. Under the action of an earthquake, the rail and the ballast slab interact with each other through the fastener resistance, the ballast slab and the beam interact with each other through the shear connectors and the interlayer friction resistance, and the beam and the bridge pier interact with each other through the bearing. After exceeding a certain limit, the anti-seismic anti-falling beam plays a role, restricting the displacement of the beam and preventing the falling of the beam.
[0025] In order to ensure the anti-seismic effect, the occlusal shear tooth groove anti-seismic anti-falling beam device at the bottom of the rail transit box beam 2 described in this embodiment has at least 2 sawtooth block ear walls 4 on the anti-falling beam concrete block 1, and at least four shear pins 3 in the sawtooth block ear wall 4. The specifications of the anti-falling beam concrete block 1 and the height of the shear key teeth of the sawtooth block ear wall 4 are determined according to the magnitude of the seismic force; the nail length of the shear pin 3 is determined according to the height of the shear key teeth of the sawtooth block ear wall 4, and the diameter of the shear pin 3 is determined according to the magnitude of the seismic force. For reference, the specifications of the anti-falling beam concrete block 1 are (0.3-0.8) m×(0.2-0.5) m×(0.3-0.6) m, the shear key tooth height of the sawtooth block ear wall 4 is 40-60 mm, the nail length of the shear pin 3 is 50-80 mm, and the diameter of the shear pin 3 is 28 mm-32 mm. The shear pin 3 is made of hot-rolled ribbed steel bars to ensure sufficient riveting force and shear resistance.
[0026] The working principle of the utility model is as follows: under the action of an earthquake, the rails and the ballast plates interact with each other through the resistance of the fasteners, the ballast plates and the beams interact with each other through the shear connectors and the interlayer friction resistance, the beams and the piers interact with each other through the supports, and the supports have a certain active displacement and an allowable displacement due to the earthquake. When the allowable displacement limit is exceeded, the pins in the supports will shear off, and the main beam will begin to slide. When the anti-seismic anti-falling beam is contacted, the anti-seismic anti-falling beam will begin to play a role, and the anti-seismic anti-falling beam will participate in energy consumption, and will not be instantly sheared off at the contact interface between the anti-seismic anti-falling beam and the main beam. Instead, the concrete will first participate in the work, and a gap will occur along the ear wall of the serrated block to form a new destructive sliding surface, and then the shear pins will participate in energy consumption, thereby limiting the displacement of the box beam and preventing the risk of falling beams.
[0027] In general, the utility model anti-seismic anti-falling beam device transforms the traditional concrete anti-falling beam, that is, the interface between the anti-falling beam and the main beam is designed with a sawtooth block ear wall, so that the traditional interface earthquake shear failure is transformed into a new arc-shaped ductile interface failure form along the sawtooth block ear wall, which fully dissipates the earthquake capacity, reduces earthquake damage, reduces earthquake losses, and ensures the earthquake safety of the bridge. At the same time, the utility model anti-seismic anti-falling beam device is provided with an interlocking shear tooth groove between the main beam and the main beam, and a shear pin is provided in the middle, which can prevent the anti-falling beam from being brittlely sheared during an earthquake, resulting in the falling of the beam. At the same time, the anti-falling beam shear tooth groove and shear pin of the technology are involved in the earthquake energy consumption, consume earthquake capacity, reduce earthquake damage, reduce earthquake losses, and have good practical value.
[0028] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above-described exemplary embodiments, and the present utility model can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present utility model. Any reference signs in the claims should not be construed as limiting the claims involved.
Claims
1. A tooth-shaped seismic protection safety device at the bottom of an intercity railway viaduct box girder, characterized in that: The invention comprises a beam-falling prevention concrete block (1), a shear pin (3) and a sawtooth block ear wall (4); a box beam (2) of rail transit is arranged on a bridge pier (5), and the tooth-shaped anti-seismic protection safety device is arranged at the bottom of the box beam (2) and on both sides of the bridge pier (5) to consume earthquake energy, limit the displacement of the box beam (2) and prevent the beam from falling.
2. The intercity railway viaduct box girder bottom bite tooth groove shaped anti-seismic protection safety device according to claim 1, characterized in that: The anti-fall beam concrete block (1) and the sawtooth block ear wall (4) are integrally formed, and the sawtooth block ear wall (4) is located on the upper part of the anti-fall beam concrete block (1) to form a shear key tooth shape; the bottom surface of the box beam (2) is provided with a shear key groove matching the shear key teeth of the sawtooth block ear wall (4), and the two are matched and embedded.
3. The intercity railway viaduct box girder bottom bite tooth groove shaped anti-seismic protection safety device according to claim 2, characterized in that: The shear pin (3) is matched with the sawtooth block ear wall (4); it is an inverted T-shaped structural member, comprising a transverse pin section and a vertical pin section; the transverse pin section is embedded in the anti-fall beam concrete block (1), and the vertical pin section is embedded in the shear key teeth of the sawtooth block ear wall (4) and extends out of the shear key teeth to contact the box beam (2), thereby fixing the anti-fall beam concrete block (1) and the sawtooth block ear wall (4) at the bottom of the box beam (2).
4. The intercity railway viaduct box girder bottom bite tooth groove shaped anti-seismic protection safety device according to claim 3, characterized in that: The number of sawtooth block ear walls (4) on the anti-fall beam concrete block (1) is no less than two, and the number of shear pins (3) in the sawtooth block ear walls (4) is no less than four.
5. The intercity railway viaduct box girder bottom bite tooth groove shaped anti-seismic protection safety device according to claim 4, characterized in that: The specifications of the anti-fall beam concrete block (1) and the height of the shear key teeth of the sawtooth block ear wall (4) are determined according to the magnitude of the seismic force; the length of the shear pin (3) is determined according to the height of the shear key teeth of the sawtooth block ear wall (4), and the diameter of the shear pin (3) is determined according to the magnitude of the seismic force.
6. The intercity railway viaduct box girder bottom bite tooth groove shaped anti-seismic protection safety device according to claim 5, characterized in that: The specifications of the anti-fall beam concrete block (1) are 0.3-0.8 m in length, 0.2-0.5 m in width, and 0.3-0.6 m in height. The shear key tooth height of the sawtooth block ear wall (4) is 40-60 mm. The nail length of the shear pin (3) is 50-80 mm. The diameter of the shear pin (3) is 28 mm-32 mm.
7. The intercity railway viaduct box girder bottom bite tooth groove shaped anti-seismic protection safety device according to claim 6, characterized in that: The shear pin (3) is made of hot-rolled ribbed steel bars.