Bridge anti-falling beam structure
By installing bearing pads and seismic platforms along the bridge pier direction, the bridge's seismic resistance is enhanced by utilizing the differences in material properties. This solves the problem of beam collapse after the bolts at the bearing pier tops shear off, achieving the dual effect of preventing beam collapse and reducing beam damage.
Patent Information
- Application Number
- CN202520024735.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-07
- Publication Date
- 2025-12-30
- Estimated Expiration
- 2035-01-07
AI Technical Summary
Existing bridge anti-falling beam devices can cause the beam to shift along with the support after the bolts on the bearing pier top are sheared. This can lead to a lack of support, causing the beam to tilt and fall into the pier, resulting in damage to the beam. Furthermore, increasing the size of the cap beam or top cap in the longitudinal direction of the bridge has limited effect in preventing beam fall, especially during earthquakes in the transverse direction.
A bearing support pad and a seismic platform are installed in the middle of the bridge pier along the bridge direction. The bearing support pad is a strip-shaped cuboid structure. The seismic platform is higher than the bearing support pad. The bridge bearing is in contact with the bearing support pad. The seismic platform is fixedly connected to the bridge bearing. By utilizing the performance differences of different materials, the seismic resistance is enhanced. The seismic platform resists further movement of the bearing and prevents the beam from moving.
After conventional anti-fall beam devices fail, this device further prevents beam falling accidents, provides double protection against beam falling, reduces the probability of beam falling, minimizes beam damage, facilitates post-earthquake repair, and does not require changes to the support size and structure.
Smart Images
Figure CN223738468U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to bridge anti -fall beam field especially, and it is a kind of bridge anti -fall beam structure. BACKGROUND
[0002] Anti -fall beam device is the last barrier of bridge against earthquake, prevent the fall beam, and is widely used in railway bridge.For example, anti -fall beam block is the most common anti -fall beam device of current railway bridge in railway engineering construction general reference drawing. After the development of anti -fall beam technology, some more flexible anti -fall beam devices with better performance are also researched, for example, tenon type anti -fall beam device, U type anti -fall beam device and other products, and these products have also been applied in actual engineering, and each has advantages from performance, construction difficulty and cost.
[0003] But no matter which anti -fall beam product, it cannot guarantee that no fall beam occurs in earthquake, can only reduce the probability of fall beam. The factors preventing the probability of fall beam are controlled by the following aspects, ① anti -fall beam product itself quality has defect, and is applied to railway bridge;② installation construction error leads to not meeting design requirement;③ installation time is longer, and bridge site climate condition is bad and rust occurs;④ long neglect, and bolt appears loose and other serious influence anti -fall beam product performance incidents;⑤ the earthquake that occurs is more than the fortification intensity.
[0004] No matter what reason, there is the possibility of fall beam, when anti -fall beam device is damaged, there is no measure to completely prevent fall beam accident at present. In highway and railway seismic standard, it is mentioned that in high intensity area, the size of bent cap or top hat in bridge direction should be increased. In railway simply supported beam, support pad stone is generally higher, when support bolt is sheared, support still has vertical support capacity, when support pier top bolt is sheared, beam body will be translated with support, when support is moved to support pad stone area, beam body will be inclined due to lack of support, and then fall beam occurs, and beam body will directly fall into pier, lead to beam body damage, so increasing the size of bent cap or top hat in bridge direction has limited effect on preventing fall beam, at least when horizontal bridge earthquake occurs, the effect is insufficient.
[0005] Therefore, the present application needs a bridge anti -fall beam structure to solve the above problems. SUMMARY
[0006] The utility model discloses a bridge anti-falling beam structure, solve the prior art's problem.
[0007] The utility model provides a bridge anti-falling beam structure, including beam body, pier, support support padstone, anti -seismic platform and bridge support, and support support padstone sets up in the bridge pier order bridge direction middle recess both sides upper surface, and support support padstone is strip cuboid structure, and support support padstone length direction is parallel with order bridge direction, and a pair of bridge supports are set up on the upper surface of support support padstone, and two bridge supports are along the pier horizontal bridge direction midline symmetry, and the contact between bridge support and support support padstone is set up, and the top surface fixed connection beam body bottom surface of bridge support, and anti -seismic platform sets up in the order bridge direction both sides of bridge support of support support padstone setting, and the height of anti -seismic too prevents beam device height from being higher than support support padstone height.
[0008] The utility model discloses a bridge anti-falling beam structure, as preferred mode, support support padstone upper surface is horizontal plane.
[0009] The utility model discloses a bridge anti-falling beam structure, as preferred mode, the length of anti -seismic platform order bridge direction is greater than the length of bridge support order bridge direction.
[0010] The utility model discloses a bridge anti-falling beam structure, as preferred mode, anti -seismic platform and support support padstone are integrally formed structure.
[0011] The utility model discloses a bridge anti-falling beam structure, as preferred mode, the height difference of anti -seismic platform height and support support padstone height is greater than or equal to 5cm and less than or equal to 30cm.
[0012] The utility model has the advantages of the following:
[0013] (1) only use the idle space on the pier top hat, increase the anti -seismic platform anti -falling beam structure, reached in the conventional anti -falling beam device failure, further prevent the occurrence of beam falling accident;
[0014] (2) without increasing the subsidiary anti -falling beam device equipment, through the optimization pier top padstone structure, reached the double anti -falling beam's purpose, provided double guarantee for the safety of bridge, greatly reduced the probability of beam falling;
[0015] (3) Ingeniously utilize the performance difference of different materials, without changing the size and structure of the support, the expected failure development form is reached, which is convenient for popularization and application, and the universality is strengthened, without the need of re-designing supporting products;
[0016] (4) When the beam body falls, it will fall on the anti-seismic platform, not on the pier top, effectively reducing the damage of the beam body, which is helpful for post-earthquake repair. BRIEF DESCRIPTION OF DRAWINGS
[0017] Figure 1 It is a schematic view of a bridge anti-falling beam structure.
[0018] Reference signs:
[0019] 1, beam body; 2, pier; 3, support supporting cushion stone; 4, anti-seismic platform; 5, bridge support. DETAILED DESCRIPTION
[0020] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Embodiment 1
[0021] As shown in the drawing, Figure 1 A bridge anti-falling beam structure includes a beam body 1, a pier 2, a support supporting cushion stone 3, an anti-seismic platform 4 and a bridge support 5. The support supporting cushion stone is arranged on the upper surface of the two sides of the middle groove of the pier 2 in the bridge direction. The support supporting cushion stone 3 is a strip-shaped cuboid structure, and the length direction of the support supporting cushion stone 3 is parallel to the bridge direction. A pair of bridge supports 5 are arranged on the upper surface of the support supporting cushion stone 3, and the two bridge supports 5 are symmetrical along the center line of the pier 2 in the transverse direction of the bridge. The bridge support 5 is in contact with the support supporting cushion stone 3, and the top surface of the bridge support 5 is fixedly connected with the bottom surface of the beam body 1. The anti-seismic platform 4 is arranged on both sides of the support supporting cushion stone 3 in the bridge direction where the bridge support 5 is arranged, and the height of the anti-seismic platform 4 is higher than that of the support supporting cushion stone 3.
[0022] The upper surface of the support supporting cushion stone 3 is a horizontal plane.
[0023] The length of the anti-seismic platform 4 in the bridge direction is greater than the length of the bridge support 5 in the bridge direction.
[0024] The anti-seismic platform 4 and the support supporting cushion stone 3 are integrally formed.
[0025] The anti-seismic platform is higher than the support supporting cushion stone. The main purpose is that when the beam body moves with the support plane, the support contacts the anti-seismic platform, which can effectively resist the further movement of the support. The resisting force generated by the anti-seismic platform is transmitted to the beam body through the support, thereby preventing the further movement of the beam body and achieving the purpose of preventing the beam from falling.
[0026] Preferably, the height of the anti-seismic platform 4 is increased by 5-30 cm than the height of the cushion stone 3, and the height is appropriately selected according to the type of the support, and the height can effectively resist the movement of the support, and will not cause great influence on the installation, maintenance and other construction work of the support.
[0027] The transverse movable support and the multi-direction movable support should be provided with a limiting block in the transverse direction of the bridge, so that the support can effectively transmit the horizontal force in the transverse direction of the bridge.
[0028] In the embodiment, TQZ(XII) and TQZ(XIII) in the installation drawing of the ball-type support of the railway commonly used span simply supported beam (Tongqiao (2023) 8362-I) can be referred to for selection.
[0029] The shear resistance of the pier top bolt is lower than that of the beam bottom bolt, so as to increase the probability that the pier top bolt is sheared off and the beam bottom bolt is not sheared off in the case of earthquake.
[0030] The beam bottom bolt is made of 12.9 grade, the pier top bolt is made of 10.9 grade, or the pier top bolt is made of 40Cr material, and the beam bottom bolt is made of 35CrMo or 42CrMo material. In short, the shear resistance of the bolt can be controlled by using different materials and grades of the bolt, instead of the size of the bolt, so as to avoid increasing the design, manufacturing and installation difficulty of the support.
[0031] The above is only the preferred specific embodiment of the utility model, but the protection scope of the utility model is not limited to this, any skilled person in the technical field according to the technical scheme and the utility model concept of the utility model within the technical range disclosed by the utility model can be equivalently replaced or changed, and all should be covered in the protection scope of the utility model.
Claims
1. A bridge fall prevention structure, characterized by: The bridge pier (2) is provided with a support pad (3) on the upper surface of both sides of the middle groove in the bridge direction, the support pad (3) is a strip-shaped cuboid structure, the length direction of the support pad (3) is parallel to the bridge direction, a pair of bridge supports (5) are arranged on the upper surface of the support pad (3), the two bridge supports (5) are symmetric along the center line of the bridge pier (2) in the transverse direction of the bridge, the bridge supports (5) are in contact with the support pad (3), the top surface of the bridge supports (5) is fixedly connected with the bottom surface of the beam body (1), the anti-seismic platform (4) is arranged on both sides of the bridge direction of the support pad (3) where the bridge supports (5) are arranged, and the height of the anti-seismic platform (4) is higher than that of the support pad (3).
2. The bridge fall prevention structure according to claim 1, characterized in that: The upper surface of the support pad (3) is a horizontal plane.
3. The bridge fall prevention structure according to claim 1, characterized in that: The length of the anti-seismic platform (4) in the bridge direction is greater than the length of the bridge support (5) in the bridge direction.
4. The bridge fall prevention structure according to claim 1, wherein: The anti-seismic platform (4) and the support pad (3) are integrally formed.
5. The bridge fall prevention structure according to claim 1, wherein: The height difference between the height of the anti-seismic platform (4) and the height of the support pad (3) is greater than or equal to 5 cm and less than or equal to 30 cm.