A bridge seismic damper structure with rotational friction energy dissipation

Abstract

The present invention discloses a bridge seismic damper structure with rotational friction energy consumption, including a limiter, a friction rod, a friction ball, a cylinder, a piston rod of the cylinder and a fixed hinge support; the limiter is fixed above the side wall of the pier, the friction rod is fixed inside the limiter and passes through the friction ball to be connected thereto; the bottom of the piston rod is connected to the friction ball, and a top section is located inside the cylinder; the top of the cylinder is hinged to the fixed hinge support; the fixed hinge support is fixed to the bottom of the beam. The present invention is reasonably designed, and the friction ball and the friction rod are provided to fully utilize the rotational friction caused by the displacement of the beam to consume the seismic energy; the cylinder and the piston rod are provided to absorb the vibration energy of the bridge during an earthquake through the damping generated by the compressed gas flow, thereby limiting the relatively large displacement of the beam and the pier. The present invention has a simple structure, convenient construction and low cost.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge earthquake resistance, and in particular relates to a bridge earthquake resistance damper structure with rotational friction energy dissipation. Background Art

[0002] Bridges are one of the country's infrastructure and play an important role in transportation and national economic development. In recent years, with the rapid development of my country's social, economic and technological development and the continuous acceleration of urbanization, the demand for cross-river bridges and urban viaducts has increased, and many bridge construction projects have emerged one after another, with the number and investment of bridges increasing. As an important transportation hub, the safety of bridges is the prerequisite for the function of bridges. However, under the influence of earthquakes, bridges may be severely damaged or even collapsed, which not only causes huge economic losses, but also threatens people's lives and safety, and brings difficulties to post-earthquake rescue work. In earthquakes, bridges are damaged in various forms. Among them, the excessive relative displacement between the upper beams and piers of the bridge is one of the main causes of bridge damage. The upper beams of the bridge may cause collisions between adjacent beams and beam fall damage due to relative displacement.

[0003] At present, in order to limit the relatively large displacement between the beam and the pier, my country's bridges generally set up connecting devices between the pier and the upper beam. The main connection forms are cable type and chain type. These connecting devices mainly rely on the damping generated by the device itself on the beam during an earthquake to hinder the relative displacement of the beam, thereby playing a limiting role. However, due to the large tensile stiffness, a large earthquake force is transmitted, which not only causes excessive damage to the device itself, but also generates excessive damping force on the bridge, thus causing excessive damage to the bridge.

[0004] In view of the above shortcomings, it is necessary to design and develop a new type of bridge seismic limiting structure that can consume earthquake energy, limit the large relative displacement of the beam and the piers, and at the same time buffer the seismic force without causing excessive force on the beam and the piers. Summary of the invention

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a bridge seismic damper structure with rotational friction energy dissipation, which can not only limit the relatively large horizontal displacement of the beam and the pier to prevent the beam from falling, but also consume and absorb seismic energy to reduce the force of the earthquake on the bridge. Moreover, the damper has a simple structure, convenient construction and low cost.

[0006] To achieve the above-mentioned purpose, the present invention discloses a bridge seismic damper structure with rotational friction energy dissipation, including a limiter, a friction rod, a friction ball, a cylinder, a piston rod of the cylinder and a fixed hinge support; the limiter is fixed above the side wall of the pier, the limiter is a square structure with a groove on the top, and connecting holes for the friction rod to pass through are provided on the front and rear surfaces of the limiter, a spherical groove for placing the friction ball is provided at the bottom of the groove, the middle part of the spherical groove is connected to the connecting hole, the friction ball is fixed to the end of the piston rod, and a round hole for the friction rod to pass through is provided on the side wall of the cylinder; the top of the cylinder is hinged to the fixed hinge support; the fixed hinge support is fixed to the bottom of the main beam.

[0007] The longitudinal section of the groove at the top of the limiter is U-shaped, and its two sides are arc-shaped surfaces; fixing plates are provided on both sides of the inner wall of the limiter, and a plurality of bolt holes are opened on the fixing plates. The bolt holes cooperate with anchor bolts to fix the limiter on the side wall of the pier.

[0008] The inner surface of the spherical groove is a rough surface, and the spherical groove fits with the friction ball, and the two are in close contact; both ends of the friction rod are provided with external threads matching with the nut, and the friction rod is clamped inside the limiter through the nut.

[0009] The inner and outer surfaces of the friction ball and the outer surface of the friction rod are both rough surfaces; the friction rod is in close contact with the inner surface of the friction ball.

[0010] The fixed hinge support includes a top plate and a rotating hinge, wherein the rotating hinge is fixed to the lower surface of the top plate; a top plate bolt hole is provided on the top plate for fixing the fixed hinge support to the bottom of the beam body in cooperation with the top plate bolts.

[0011] The top of the piston rod is connected to the piston, and the piston forms a seal for the gas inside the cylinder; the top of the piston rod is separated from the bottom of the cylinder by a certain distance.

[0012] A semi-cylindrical pin head is provided on the top of the cylinder, and a through hole for a rotary hinge to pass through is provided on the pin head. The pin head on the top of the cylinder is hinged to a fixed hinge support through a rotary hinge.

[0013] The beneficial effects of the present invention are:

[0014] 1) The present invention can effectively absorb and consume earthquake energy. On the one hand, the friction ball is connected to the piston rod and can rotate with the piston rod during an earthquake. The inner and outer surfaces of the friction ball can generate friction during the rotation process, which greatly consumes the earthquake energy. On the other hand, during an earthquake, the gas in the cylinder will be compressed during the vibration displacement of the upper beam. When the gas is compressed and flows, it will generate damping to absorb the vibration energy and buffer the earthquake force.

[0015] 2) The present invention can effectively limit the relatively large horizontal displacement between the beam and the pier. When the gas in the cylinder is compressed to the limit, a large pressure is generated to resist the displacement of the beam, and due to the limiting effect of the friction rod inside the limiter at the pier, the continued rotation of the piston rod is suppressed, thereby preventing further horizontal displacement of the upper beam.

[0016] 3) The present invention can limit in multiple directions. The design of the arc-shaped surfaces on both sides of the "U"-shaped longitudinal section of the groove at the top of the limiter provides rotation space for the piston rod in the longitudinal and transverse directions of the bridge, thereby limiting the relative displacement of the beam body in multiple directions.

[0017] 4) The present invention has a simple structure, convenient construction, low cost, and is easy to repair. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structural arrangement of the present invention;

[0019] Figure 2 It is a schematic diagram of the structure of the position-limiting member of the present invention;

[0020] Figure 3 It is a schematic diagram of the friction rod structure of the present invention;

[0021] Figure 4 It is a schematic diagram of the main structure of the damper of the present invention;

[0022] In the figure: 1 limit piece, 2 fixed plate, 3 friction rod, 4 anchor bolt, 5 connecting hole, 6 friction ball, 7 piston rod, 71 piston, 8 cylinder, 9 fixed hinge support, 10 rotating hinge, 11 top plate, 12 top plate bolt, 13 spherical groove, 14 bolt hole, 15 nut, 16 pin head, 17 through hole, 18 round hole, 19 main beam, 20 expansion joint, 21 bridge support, 22 bridge pier, 23 groove. DETAILED DESCRIPTION

[0023] The present invention is further described below:

[0024] See also Figure 1-4 ,

[0025] The present invention discloses a bridge anti-seismic damper structure with rotational friction energy consumption, comprising a limiter 1, a friction rod 3, a friction ball 6, a cylinder 8, a piston rod 7 of the cylinder 8 and a fixed hinge support 9;

[0026] The stopper 1 is fixed above the side wall of the pier 22. The stopper 1 is a square structure with a groove 23 on the top. The front and rear surfaces of the stopper 1 are provided with connecting holes 5 for the friction rod 3 to pass through. The bottom of the groove 23 is provided with a spherical groove 13 for placing the friction ball 6. The bottom of the spherical groove 13 is connected to the connecting hole 5. The friction ball 6 is fixed to the end of the piston rod 7. The side wall of the stopper 1 is provided with a round hole 18 for the friction rod 3 to pass through.

[0027] The top end of the cylinder 8 is hinged to the fixed hinge support 9 ; the fixed hinge support 9 is fixed to the bottom of the main beam 19 .

[0028] The longitudinal section of the groove 23 at the top of the limit member 1 is "U"-shaped, and its two sides are arc-shaped surfaces; fixing plates 2 are provided on both sides of the inner wall of the limit member 1, and a plurality of bolt holes 14 are opened on the fixing plate 2. The bolt holes 14 cooperate with the anchor bolts 4 to fix the limit member 1 on the side wall of the pier 22. By setting the groove 23, the maximum angle of rotation of the piston rod 7 can be limited. When the piston rod 7 is rotated to the maximum angle, a large pulling force can be generated on the pier 22.

[0029] The inner surface of the spherical groove 13 is a rough surface, and the spherical groove 13 fits with the friction ball 6, and the two are in close contact; both ends of the friction rod 3 are provided with external threads matching the nut 15, and the friction rod 3 is clamped in the inside of the limiter 1 by the nut 15; the inner and outer surfaces of the friction ball 6 and the outer surface of the friction rod 3 are rough surfaces, and the friction rod 3 is in close contact with the inner surface of the friction ball 6; during an earthquake, the piston rod 7 will rotate following the movement of the cylinder 8, thereby driving the friction ball 6 to rotate relative to the friction rod 6 and the surface of the spherical groove 13 to generate friction; before the earthquake, a pre-tension is provided between the piston rod 7 and the friction ball 6, so that the friction ball 6 can respond quickly to generate friction when the piston rod 7 rotates.

[0030] The fixed hinge support 9 includes a top plate 11 and a rotating hinge 10, and the rotating hinge 10 is fixed to the lower surface of the top plate 11; the top plate 11 is provided with a top plate bolt hole for fixing the fixed hinge support 9 to the bottom of the beam body 19 in conjunction with the top plate bolts 12.

[0031] The top of the piston rod 7 is connected to a piston 71, and the piston 71 forms a seal for the gas inside the cylinder 8; the top of the piston rod 7 is separated from the bottom of the cylinder 8 by a certain distance.

[0032] A semi-cylindrical pin head 16 is provided on the top of the cylinder 8 , and a through hole 17 for the rotary hinge 10 to pass through is provided on the pin head 16 . The pin head 16 on the top of the cylinder 8 is hinged to the fixed hinge support 9 through the rotary hinge 10 .

[0033] Working principle: 1. Under normal circumstances, the piston rod 7 has a pre-tensioning effect on the friction ball 6, and the friction ball 6 exerts pressure on the surface of the friction rod 3 and the surface of the spherical groove 13 to ensure that the friction ball 6 can respond quickly to generate friction when the piston rod 7 rotates. At the same time, the gas inside the cylinder 8 flows freely, and the damping generated is very small. 2. Under the action of small and medium earthquakes, the main beam 19 and the bridge pier 22 vibrate and produce relative displacement. When the cylinder 8 vibrates and displaces with the main beam, the gas inside it is compressed, the gas flow is accelerated and vibrates violently, and damping is generated to absorb vibration energy; in addition, the piston rod 7 also rotates with the movement of the cylinder 8, thereby driving the friction ball 6 to rotate relative to the friction rod 6 and the surface of the spherical groove 13 to generate friction, consuming most of the earthquake energy. 3. Under the action of a major earthquake, as the gas inside the cylinder 8 is continuously compressed, when the gas inside the cylinder 8 reaches the compression limit, a relatively large pressure is generated, which hinders the relative displacement of the main beam 19. Due to the limiting effect of the friction rod 3 inside the limiter 1, the piston rod 7 exerts a relatively large pulling force on the pier 22, hindering further relatively large displacement of the main beam 19 and the pier 22, thereby avoiding the occurrence of falling beams, protecting the bridge bearings 21, and also protecting the expansion joints 20.

[0034] 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 bridge seismic damper structure with rotational friction energy dissipation, characterized in that: It comprises a limiter (1), a friction rod (3), a friction ball (6), a cylinder (8), a piston rod (7) of the cylinder (8), and a fixed hinge support (9); The stopper (1) is fixed above the side wall of the pier (22). The stopper (1) is a square structure with a groove (23) on the top. The front and rear surfaces of the stopper (1) are provided with connection holes (5) for the friction rod (3) to pass through. The bottom of the groove (23) is provided with a spherical groove (13) for accommodating the friction ball (6). The middle of the spherical groove (13) is connected to the connection hole (5). The friction ball (6) is fixed to the end of the piston rod (7). The side wall of the stopper (1) is provided with a round hole (18) for the friction rod (3) to pass through. The top end of the cylinder (8) is hinged to the fixed hinge support (9). The fixed hinge The support (9) is fixed to the bottom of the main beam (19); the longitudinal section of the groove (23) at the top of the limiting member (1) is "U"-shaped, and its two sides are arc-shaped curved surfaces; fixing plates (2) are provided on both sides of the inner wall of the limiting member (1), and a plurality of bolt holes (14) are opened on the fixing plate (2), and the bolt holes (14) cooperate with anchor bolts (4) to fix the limiting member (1) on the side wall of the pier (22); the top of the piston rod (7) is connected to the piston (71), and the gas inside the cylinder (8) is sealed by the piston (71); the top of the piston rod (7) is separated from the bottom of the cylinder (8) by a certain distance.

2. The bridge seismic damper structure with rotational friction energy dissipation according to claim 1, characterized in that: The inner surface of the spherical groove (13) is a rough surface, and the spherical groove (13) fits with the friction ball (6), and the two are in close contact; both ends of the friction rod (3) are provided with external threads matching the nut (15), and the friction rod (3) is clamped inside the limiter (1) through the nut (15).

3. The bridge seismic damper structure with rotational friction energy dissipation according to claim 2 is characterized in that: The inner and outer surfaces of the friction ball (6) and the outer surface of the friction rod (3) are both rough surfaces; the friction rod (3) is in close contact with the inner surface of the friction ball (6).

4. The bridge seismic damper structure with rotational friction energy dissipation according to claim 1 is characterized in that: The fixed hinge support (9) comprises a top plate (11) and a rotary hinge (10), wherein the rotary hinge (10) is fixed to the lower surface of the top plate (11); a top plate bolt hole is provided on the top plate (11) for fixing the fixed hinge support (9) to the bottom of the main beam (19) in cooperation with a top plate bolt (12).

5. The bridge seismic damper structure with rotational friction energy dissipation according to claim 4 is characterized in that: A semi-cylindrical pin head (16) is provided at the top of the cylinder (8), and a through hole (17) is provided on the pin head (16) for the rotary hinge (10) to pass through. The pin head (16) at the top of the cylinder (8) is hinged to the fixed hinge support (9) via the rotary hinge (10).

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