A multi-directional buffering, limiting, energy-absorbing bridge seismic stopper reinforced with steel springs

Abstract

The present invention relates to the field of bridge seismic technology, and in particular to a multi-directional buffering, limiting, and energy-absorbing bridge seismic stopper reinforced with a steel spring, comprising a steel corbel and a stopper structure, wherein the steel corbel is fixed above the side wall of the pier, and the stopper structure comprises an upper concave stopper and a lower square stopper; it comprises a steel spring, which is fixed below both sides of the concave stopper; it comprises a buffer device, which comprises a movable steel plate, a compression spring, and a triangular stopper. The present invention limits excessive displacement between the upper main beam and the lower pier in the transverse and longitudinal directions of the bridge, and prevents beam drop damage in the transverse and longitudinal directions; transfers the collision between adjacent beams at the expansion joint to multiple bridge seismic stops, and reduces the expansion impact damage at the expansion joint and the local damage in the collision area between adjacent beams; the stopper has a certain reset ability; the material price is low, the structure is simple, and the construction is convenient.

Description

Technical Field

[0001] The invention relates to the technical field of bridge earthquake resistance, and in particular to a multi-directional buffering, limiting and energy-absorbing bridge earthquake resistance stopper reinforced with a steel spring. Background Art

[0002] When an earthquake strikes, first of all, people's lives and property are under great threat. On the other hand, the earthquake has caused serious damage to the bridge projects in the earthquake zone, cutting off the external traffic in the earthquake-stricken areas, causing an island effect, causing great difficulties for the post-earthquake disaster relief work, leading to subsequent secondary disasters, and indirectly making the economic losses more serious. In addition, the construction cost of bridges is high and the number of bridges is large. Bridges are important nodes and hubs of the transportation lifeline, but due to the characteristics of their structure, bridges are also a weak link in the transportation line. Once damaged by an earthquake, not only will the losses be huge, but the post-earthquake repair work will also be difficult. Based on the above defects, research on strengthening bridges to resist earthquake damage and minimizing the damage to bridges caused by earthquakes is of great significance to the development of bridges.

[0003] The damage caused by earthquakes to bridges mainly takes the following forms: 1. Beam falling due to failure of supporting connections or excessive displacement of upper beams, most of which occurs in the longitudinal direction of the bridge; 2. Local damage caused by collision of beams at expansion joints; 3. Falling of movable bearings, displacement of bearings or structural damage of bearings themselves; 4. Bending and shear damage of piers, tilting and sliding of abutments, and collision damage between abutments and superstructures; 5. Seismic damage to pile foundations caused by failure of foundations and shear and bending damage to pile foundations caused by inertial forces transmitted from superstructures.

[0004] The collapse of bridges during an earthquake can cause many hazards. However, there are still many bridges in my country that were designed according to the original design standards or have already suffered certain damages. They cannot meet the current social needs of a large number of vehicles and heavy transportation weights. Strengthening or renovating these bridges requires a lot of manpower and material resources.

[0005] In order to limit the large displacement of the upper beam of the bridge in the transverse direction, reinforced concrete blocks are often installed on both sides of the top of the pier cap beam, while there are relatively few preventive measures to limit the longitudinal and vertical displacement of the upper beam. However, beams often fall in the longitudinal direction of the bridge after the bridge is hit by an earthquake, and the collision between ordinary reinforced concrete blocks and beams is a rigid collision, which is easy to cause local damage. In addition, due to the insufficient structural force performance, the transverse blocks are prone to irreparable damage and cannot effectively limit the displacement of the beam.

[0006] In view of the above defects, it is necessary to design and develop a new type of multi-directional limit-seismic stop block structure, which can not only limit the displacement of the upper beam in multiple directions, but also have a buffer energy-absorbing device to limit the large-scale displacement of the beam while reducing damage to the stop block itself. Summary of the invention

[0007] The purpose of the present invention is to overcome the deficiencies of the prior art and to provide a multi-directional buffering, limiting, energy-absorbing bridge seismic stopper reinforced with a steel spring, which limits excessive displacement between the upper main beam and the lower pier in the transverse and longitudinal directions of the bridge, and prevents the beam from falling and causing earthquake damage in the transverse and longitudinal directions; transfers the collision between adjacent beams at the expansion joint to multiple bridge seismic stops, and reduces the expansion impact damage at the expansion joint and the local damage in the collision area between adjacent beams; uses steel springs to reinforce the structure at multiple locations, and converts the rigid collision between the beam and the stopper into an elastic collision as much as possible, avoiding damage to the stopper and consuming earthquake energy at the same time; due to the characteristics of the steel spring, the stopper has a certain reset ability; and can reduce the collision between the bridge and the support in the vertical direction, and minimize damage to the support.

[0008] In order to achieve the purpose of the present invention, the technical solution adopted by the present invention is:

[0009] The present invention discloses a steel spring reinforced multi-directional buffering, limiting, energy-absorbing bridge seismic stopper, comprising a steel corbel and a stopper structure, wherein the steel corbel is fixed above the side wall of the pier by steel corbel bolts, and the stopper structure comprises a steel top plate fixed to the bottom of the main beam by steel top plate bolts and a square stopper fixed to the top of the steel corbel, a concave stopper with an inverted "concave" structure is fixed to the bottom of the steel top plate, a rough friction surface is formed on the upper surface of the square stopper, and the friction surface is in close contact with the top of the groove at the bottom of the concave stopper, and a plurality of stopper compression springs are connected between the upper side wall of the square stopper and the side wall of the groove at the bottom of the concave stopper; a bridge fixing support arranged on a support pad stone is provided between the main beam and the pier.

[0010] The steel corbel includes a top plate, an inner plate, an outer plate and a web plate. The inner plate is provided with a plurality of bolt holes for fixing it above the side wall of the pier. A top plate and two web plates are vertically arranged between the outer plate and the inner wall of the inner plate, and the top of the web plate is connected to the bottom of the top plate.

[0011] A steel spring is arranged between the two sides of the bottom of the concave stopper and the top plate, and two ends of the steel spring are respectively welded to the two sides of the bottom of the concave stopper and the top plate.

[0012] The two sides of the bottom of the concave stopper are hinged to the top of the connecting steel plate, and the bottom end of the connecting steel plate is hinged to the top plate through a first rotating hinge support, and the first rotating hinge support is fixed to the top of the top plate.

[0013] Buffer devices are symmetrically distributed on both sides of the connecting steel plate, and the buffer device includes a movable steel plate, a compression spring and a triangular baffle. The bottom of the triangular baffle is fixed to the top plate, and the bottom end of the movable steel plate is fixed to the top plate through a second rotating hinge support. The compression spring is fixed between the triangular baffle and the movable steel plate.

[0014] The connecting steel plate and the movable steel plate are energy-dissipating reset type low-yield strength steel, and the yield strength thereof is lower than the yield strength of other steel materials in the block structure.

[0015] The triangular baffle is made of rubber material.

[0016] An expansion joint is formed between the main beam and the second main beam, and a movable bridge bearing arranged on a second bearing pad stone is provided between the second main beam and the bridge pier. The maximum displacement of the steel spring is less than the maximum distance that the movable bridge bearing can move; the maximum displacement of the steel spring is less than the width of the expansion joint.

[0017] The beneficial effects of the present invention are:

[0018] The present invention can limit the large displacement of the bridge in multiple directions. When an earthquake occurs, the bridge will be displaced in the transverse direction, along the bridge direction, and vertically. An energy-absorbing buffer-type bridge anti-seismic block fixed with a steel spring is installed near each movable support. The steel spring and the block can simultaneously limit the relatively large displacement of the upper beam in three directions, protect the support, prevent the beam from falling in the along and transverse directions of the bridge and warping damage caused by the beam vertically detaching from the support, and prevent vertical collision damage between the beam and the support. The device is arranged in large numbers and dispersedly, which can effectively reduce the seismic force acting on each block and protect the bridge from damage;

[0019] The present invention has a certain ability to buffer and dissipate energy. When the upper beam and the pier are displaced, the connecting steel plate will deform, and the energy generated by its plastic deformation will consume the seismic energy, and it can also limit the vertical displacement of the beam; the connecting steel spring connected to it will undergo elastic deformation to prevent the bridge from displacing and consume seismic energy; at the same time, the energy-absorbing low-yield point steel plate and steel spring in the buffer device connecting the two ends of the steel sheet play a certain role in energy dissipation and buffering; the sliding friction force generated by the displacement of the square block and the concave block in the transverse direction of the bridge (this sliding friction force also plays a role when displacing along the bridge) can also consume seismic energy;

[0020] The invention has the advantages of low material price, simple structure, convenient construction and the like. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a layout diagram of the present invention along the bridge direction;

[0022] Figure 2It is the transverse bridge layout diagram of the present invention;

[0023] Figure 3 It is a schematic diagram of the longitudinal structure of the present invention;

[0024] Figure 4 It is a schematic diagram of the transverse bridge structure of the present invention.

[0025] In the figure: 1 steel corbel, 2 square block, 3 concave block, 4 connecting steel plate, 5 steel spring, 6 triangular baffle, 7 compression spring, 8 movable steel plate, 9 first rotating hinge support, 10 second rotating hinge support, 11 top plate, 12 inner plate, 13 outer plate, 14 web plate, 15 steel corbel bolt, 16 steel top plate bolt, 17 block compression spring, 18 friction surface, 19 main beam, 20 second main beam, 21 fixed bridge bearing, 22 bearing pedestal stone, 23 movable bridge bearing, 24 second bearing pedestal stone, 25 bridge pier, 26 block structure, 27 buffer device, 28 expansion joint, 29 steel top plate. DETAILED DESCRIPTION

[0026] The present invention is further described below:

[0027] See also Figure 1-4 ,

[0028] The present invention discloses a multi-directional buffering, limiting, and energy-absorbing bridge seismic stopper reinforced with a steel spring, comprising a steel corbel 1 and a stopper structure 26, wherein the steel corbel 1 is fixed to the top of the side wall of the pier 25 by means of steel corbel bolts 15, and the stopper structure 26 comprises a steel top plate 29 fixed to the bottom of the main beam 19 by means of steel top plate bolts 16, and a square stopper 2 fixed to the top of the steel corbel 1, a concave stopper 3 having an inverted "concave" structure is fixed to the bottom of the steel top plate 29, a rough friction surface 18 is formed on the upper surface of the square stopper 2, and the friction surface 18 is in close contact with the top of the groove at the bottom of the concave stopper 3, and a plurality of stopper compression springs 17 are connected between the top of the side wall of the square stopper 2 and the side wall of the groove at the bottom of the concave stopper 3; a bridge fixed bearing 21 arranged on a bearing pad stone 22 is provided between the main beam 19 and the pier 25.

[0029] The steel corbel 1 includes a top plate 11, an inner plate 12, an outer plate 13 and a web plate 14. The inner plate 12 is provided with a plurality of bolt holes for fixing it to the upper side wall of the pier 25. A top plate 11 and two web plates 14 are provided vertically disposed between the outer plate 13 and the upper side of the inner wall of the inner plate 12. The top of the web plate 14 is connected to the bottom of the top plate 11.

[0030] A steel spring 5 is provided between the two sides of the bottom of the concave stopper 3 and the top plate 11 , and two ends of the steel spring 5 are welded to the two sides of the bottom of the concave stopper 3 and the top plate 11 , respectively.

[0031] The two sides of the bottom of the concave stopper 3 are hinged to the top of the connecting steel plate 4 , and the bottom end of the connecting steel plate 4 is hinged to the top plate 11 through a first rotating hinge support 9 , and the first rotating hinge support 9 is fixed to the top of the top plate 11 .

[0032] Buffer devices 27 are symmetrically distributed on both sides of the connecting steel plate 4, and the buffer device 27 includes a movable steel plate 8, a compression spring 7 and a triangular baffle 6. The bottom of the triangular baffle 6 is fixed to the top plate 11, and the bottom end of the movable steel plate 8 is fixed to the top plate 11 through a second rotating hinge support 10. The compression spring 7 is fixed between the triangular baffle 6 and the movable steel plate 8.

[0033] The connecting steel plate 4 and the movable steel plate 8 are energy-dissipating reset type low-yield strength steel, and the yield strength thereof is lower than the yield strength of other steel materials in the block structure 26 .

[0034] The triangular baffle 6 is made of rubber material.

[0035] An expansion joint 28 is formed between the main beam 19 and the second main beam 20, and a movable bridge bearing 23 arranged on a second bearing pad stone 24 is provided between the second main beam 20 and the bridge pier 25. The maximum displacement of the steel spring 5 is less than the maximum distance that the movable bridge bearing 23 can move; the maximum displacement of the steel spring 5 is less than the width of the expansion joint 28.

[0036] Working principle: In the absence of an earthquake, the connecting steel plate 4 is in a vertical state without deformation, the square block 2 is located in the middle of the groove of the concave block 3, and its upper surface is in close contact with the lower surface of the groove of the concave block 3, and the springs at various locations are in a natural state without deformation; under the action of an earthquake, a relative displacement occurs between the main beam 19 and the pier 25. On the one hand, the connecting steel plate 4 deforms in the direction of the bridge, and the energy generated by its plastic deformation consumes the seismic energy, thereby protecting the bridge; at the same time, the steel spring 5 converts part of the seismic energy into elastic potential energy due to tension (compression), further consuming the seismic energy and limiting the structure. Displacement along the bridge; when the structure is displaced to a certain distance along the bridge, the connecting steel plate 4 contacts the movable steel plate 8. When the structure continues to move along the bridge, the compression spring 7 connected to the movable steel plate 8 is compressed, converting the earthquake energy into the elastic potential energy of the compression spring, preventing the structure from continuing to move. In this process, the rubber triangular baffle 6 consumes the earthquake energy, and the energy-dissipating reset type low-yield strength steel movable steel plate 8 can also consume the earthquake energy; on the other hand, due to the rough contact surface between the square block 2 and the concave block 3, when displacement occurs along the bridge, the contact surface slides relative to each other, and frictional heat is generated to consume part of the earthquake energy. In the transverse direction of the bridge, the elastic potential energy generated by the block compression spring 17 and the sliding friction generated by the displacement of the square block 2 and the concave block 3 in the transverse direction of the bridge can also be used to consume earthquake energy, thereby limiting the transverse displacement of the bridge; when the earthquake stops, the bridge is reset to a certain extent under the action of the buffer device 27 and the steel spring 5.

[0037] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention's specification and drawings or directly or indirectly applied in related technical fields are also included in the patent protection scope of the present invention.

Claims

1. A multi-directional buffering, limiting, energy-absorbing bridge seismic stopper reinforced with a steel spring, characterized in that: The invention comprises a steel corbel (1) and a stopper structure (26), wherein the steel corbel (1) is fixed to the top of the side wall of the pier (25) by means of steel corbel bolts (15), and the stopper structure (26) comprises a steel top plate (29) fixed to the bottom of the main beam (19) by means of steel top plate bolts (16) and a square stopper (2) fixed to the top of the steel corbel (1), a concave stopper (3) in an inverted "concave" structure is fixed to the bottom of the steel top plate (29), a rough friction surface (18) is formed on the upper surface of the square stopper (2), and the friction surface (18) is in close contact with the top of the groove at the bottom of the concave stopper (3), and the side wall of the square stopper (2) is provided with a friction surface (18). A plurality of stopper compression springs (17) are connected between the side wall of the groove at the bottom of the concave stopper (3); a bridge fixing support (21) arranged on a support pad stone (22) is provided between the main beam (19) and the pier (25); the steel bracket (1) comprises a top plate (11), an inner plate (12), an outer plate (13) and a web plate (14); the inner plate (12) is provided with a plurality of bolt holes for fixing it to the upper side wall of the pier (25); a top plate (11) and two web plates (14) arranged vertically therewith are provided between the upper side wall of the outer plate (13) and the inner plate (12); the web plates (14) The top of the concave stopper (3) is connected to the bottom of the top plate (11); the bottom sides of the concave stopper (3) are hinged to the top of the connecting steel plate (4); the bottom end of the connecting steel plate (4) is hinged to the top plate (11) through a first rotating hinge support (9); the first rotating hinge support (9) is fixed to the top of the top plate (11); buffer devices (27) are symmetrically distributed on both sides of the connecting steel plate (4); the buffer device (27) includes a movable steel plate (8), a compression spring (7) and a triangular baffle (6); the bottom of the triangular baffle (6) is fixed to the top plate (11); the bottom end of the movable steel plate (8) is hinged to the top plate (11) through a second rotating hinge support (10) The invention relates to a bridge pier (25) and a bridge pier (26). The bridge pier (26) is fixed on the top plate (11); the compression spring (7) is fixed between the triangular baffle (6) and the movable steel plate (8); an expansion joint (28) is formed between the main beam (19) and the second main beam (20); a bridge movable bearing (23) arranged on a second bearing pad stone (24) is provided between the second main beam (20) and the bridge pier (25); steel springs (5) are provided between the bottom sides of the concave baffle (3) and the top plate (11); the maximum displacement of the steel spring (5) is less than the maximum distance that the bridge movable bearing (23) can move; and the maximum displacement of the steel spring (5) is less than the width of the expansion joint (28).

2. The steel spring reinforced multi-directional buffering, limiting, energy-absorbing bridge anti-seismic stopper according to claim 1, characterized in that: Two ends of the steel spring (5) are respectively welded to two sides of the bottom of the concave stopper (3) and the top plate (11).

3. The steel spring reinforced multi-directional buffering, limiting and energy-absorbing bridge anti-seismic stopper according to claim 2 is characterized by: The connecting steel plate (4) and the movable steel plate (8) are energy-dissipating reset type low-yield strength steel, and the yield strength thereof is lower than the yield strength of other steel materials in the stopper structure (26).

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