An energy-absorbing multi-directional limited bridge seismic device with steel springs

Abstract

The invention discloses an energy-consuming multi-directional limit bridge earthquake-resistant device with a steel spring, comprising a steel bracket, a limiter, a steel spring, a slider and a connecting steel column; the steel bracket is fixed to the side of the top of the bridge pier near the movable support, the limiter is fixed to the bottom of the main beam and the steel bracket, and the two limiters are aligned and arranged symmetrically up and down; the limiter comprises a fixed plate, a square steel stopper and two-side tensile steel stoppers, the slider is located inside the limiter, and the two ends of the connecting steel column are respectively connected to the upper and lower sliders, the material of the middle cylindrical part is energy-consuming low-yield strength steel, which can consume earthquake energy by relying on the energy generated by its plastic deformation, one end of the steel spring is fixed to the inner wall of the vertical section of the tensile steel stopper on both sides, and the other end is connected to the slider, and after the earthquake ends, the device can be reset to a certain extent through its restoring force. The device has a simple structure, good earthquake-resistant effect, and can be limited in three directions.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge earthquake resistance, and in particular relates to an energy-absorbing multi-directional limit bridge earthquake resistance device with a steel spring. Background Art

[0002] In recent years, with the rapid development of social economy and technology, the urbanization process has been accelerating, and the construction of bridge projects has increased day by day. The number of bridges and their extension length have increased day by day, especially in cities, where viaducts have become the main traffic arteries. As a hub project on the lifeline of transportation, bridges have a large investment and a large number. They play a pivotal role in my country's economic development and people's production and life. Once they are damaged, the losses they cause are also huge. Therefore, the safety of bridges is the premise of bridge construction. Affected by natural disasters, especially earthquakes, bridge facilities will suffer huge damage or even collapse, which will not only threaten the safety of people's lives and property, but also cause difficulties in subsequent bridge repair or reconstruction. Under the action of earthquakes, the main forms of bridge damage are as follows: damage to the connecting parts such as bridge supports; excessive displacement of the bridge superstructure under the action of horizontal forces, resulting in beam drop (including transverse and longitudinal directions); collision and destruction between adjacent beam spans (expansion joints) of the bridge; lack of bending and shear strength of the plastic hinge of the bridge pier, resulting in damage to the bridge pier.

[0003] At present, in order to limit the relatively large displacement between the upper beams, bridges in my country often install reinforced concrete blocks on the top of the pier cap beams. However, the collision between ordinary reinforced concrete blocks and beams is a rigid collision with a large impact force, which can easily cause local damage to the beams and concrete blocks. In addition, the horizontal shear force of reinforced concrete blocks is usually insufficient during earthquakes, and the blocks are prone to irreparable damage and cannot effectively limit the displacement of the beams. In addition, other bridge seismic limit structures are mostly for the displacement of bridge beams in a single direction (along the bridge or across the bridge), while earthquake waves have three directions, and limiting the displacement of beams in a single direction obviously has limitations; general block structures mostly rely on the deformation energy of the block itself to consume earthquake energy, and have poor elastic-plastic properties, and cannot be well restored to their original state after deformation.

[0004] In view of the above-mentioned deficiencies, it is necessary to design and develop a new type of bridge seismic limit device, which can not only buffer and consume earthquake energy without causing additional damage to the beam and the device itself, but also limit the displacement of the beam in three directions, and enable the device to return to its original state after the earthquake in order to cope with the next earthquake. Summary of the invention

[0005] In view of the above-mentioned defects of the prior art, the present invention provides an energy-absorbing multi-directional limited bridge seismic device with steel springs, which limits the relatively large displacement between the beam and the pier in three directions, protects the bearings, and prevents the beam from falling and causing earthquake damage; converts the direct collision between the beams into the yield deformation of the connecting steel columns, indirectly consumes the seismic energy, and prevents the damage of the collision to the beam itself; increases the number of energy-absorbing connecting steel columns and the number of the devices themselves in a single device, greatly reduces the tension acting on each connecting steel column, and consumes more seismic energy; utilizes the restoring force of the steel spring to enable the device to achieve a certain reset function after the earthquake.

[0006] In order to achieve the purpose of the present invention, the technical solution adopted by the present invention is:

[0007] An energy-absorbing multi-directional limit bridge seismic device with a steel spring, comprising a steel corbel, a limiter, a steel spring, a slider and a connecting steel column; the steel corbel is fixed to the side of the top of the pier near the movable support of the bridge by bolts; the limiter comprises a fixed plate, a square steel stopper and two side tensile steel stoppers, the square steel stoppers are fixed to the front and rear sides of the upper surface of the fixed plate, and a slide rail equal to the width of the slider is formed between the two square steel stoppers; the two tensile steel stoppers are in an inverted "L" shape, respectively arranged on the left and right sides of the upper surface of the fixed plate, and the horizontal section of the tensile steel stopper is connected to the fixed plate The distance between the surfaces is equal to the height of the slider, the steel spring is arranged between the vertical section of the anti-tensile steel stopper and the end face of the slider, and the two are connected to the two ends of the steel spring; the limit member includes an identical upper limit member and a lower limit member, the fixing plate of the lower limit member is fixed to the top of the steel corbel by bolts, and the fixing plate of the upper limit member is fixed to the bottom of the main beam by bolts; one end of the connecting steel column is fixed to the bottom of the slider in the upper limit member, and the other end is fixed to the top of the slider in the lower limit member; a movable bridge bearing arranged on the bridge bearing pad stone is provided between the main beam and the pier.

[0008] The horizontal sections of the anti-tensile steel stopper are located on both sides of the upper surface of the slider, and the distance between the anti-tensile steel stoppers on both sides is less than the length of the slider; the bottom of the anti-tensile steel stopper is fixed to the fixed plate through a lower base plate, and the lower base plate is provided with a threaded hole for the second lower base plate bolt to pass through.

[0009] The steel corbel includes a top plate, an inner plate, a bottom 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. One end of the top plate is vertically connected to the top of the inner plate, one end of the bottom plate is vertically connected to the bottom of the inner plate, the inner wall of the web plate is connected to the outer wall of the inner plate, and the top and bottom thereof are respectively connected to the lower surface of the top plate and the upper surface of the bottom plate.

[0010] Pin heads are provided at both ends of the connecting steel column, and through holes are provided on the pin heads for the shaft pin to pass through; grooves for inserting the two ends of the connecting steel column are provided on both sides in the middle of the top of the slider, and the cross-section of the groove is a semicircular arc structure. The shape of the groove matches the pin heads at both ends of the connecting steel column, and the width of the groove is slightly larger than the width of the pin head; connecting holes for the shaft pin to pass through are provided on the slider, and the connecting holes are located on both sides of each groove and pass through the front and rear surfaces of the slider.

[0011] The middle of the connecting steel column is a cylindrical structure, which is made of energy-absorbing low-yield strength steel, and its yield strength is lower than the yield strength of the pin head.

[0012] An expansion joint is formed between the main beam and the second main beam, and a movable bridge bearing set on the bridge bearing pad stone is provided between the main beam and the pier. The distance between the two side surfaces of the sliding block and the inner walls of the vertical sections of the anti-tensile steel blocks on both sides is less than the maximum distance that the movable bridge bearing can move; the distance between the two side surfaces of the sliding block and the inner walls of the vertical sections of the anti-tensile steel blocks on both sides is less than the width of the expansion joint.

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

[0014] 1) The present invention can effectively buffer and consume earthquake energy, limit the relatively large displacement between the bridge beam and the pier, prevent the beam from falling and being damaged, and reduce earthquake damage to the movable bearings and expansion joints. On the one hand, because the earthquake-resistant device is arranged near each movable bearing, and each earthquake-resistant device is provided with two energy-absorbing connecting steel columns, the number of connecting steel columns is large, which consumes most of the earthquake energy, while reducing the force of the earthquake on each connecting steel column and the damage to the device itself; on the other hand, when an earthquake acts, the steel spring arranged between the slider and the anti-pulling steel blocks on both sides will convert part of the earthquake energy into elastic potential energy, buffering the force of the earthquake and consuming part of the earthquake energy.

[0015] 2) The present invention can achieve three-way limit. The two ends of the connecting steel column are respectively connected to the slider on the limit piece at the bottom of the bridge main beam and the slider on the upper limit piece of the steel bracket, and the grooves matched with the pins at both ends of the connecting steel column provide a rotation space for the connecting steel column, so that the device can adapt to the displacement of the beam body along the bridge, transverse to the bridge and vertically.

[0016] 3) The present invention can achieve a certain reset function. The steel spring is arranged between the slider and the anti-pulling steel blocks on both sides. Through its restoring force, the device can be restored to a state close to the original state after the earthquake, so as to cope with the next earthquake.

[0017] 4) The present invention has the advantages of low material price, simple structure, easy installation, easy detection and maintenance, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of the main structure of the present invention;

[0019] Figure 2 It is a side view structural schematic diagram of the present invention;

[0020] Figure 3 It is a schematic diagram of the three-dimensional structure of the present invention;

[0021] Figure 4 This is a layout diagram of the present invention along the bridge direction;

[0022] Figure 5 It is the transverse bridge layout diagram of the present invention.

[0023] In the figure: 1 steel corbel, 2 limit piece, 3 steel spring, 4 slider, 5 connecting steel column, 6 fixing plate, 7 square steel block, 8 tensile steel block, 9 side plate, 10 top plate, 11 web plate, 12 bottom plate, 13 steel corbel side plate bolts, 14, 15 first and second lower bottom plate bolts, 16 connecting holes, 17 grooves, 18 main beam, 19 expansion joint, 20 second main beam, 24 bridge bearing pedestal stone, 23 movable bridge bearing, 25 bridge pier. DETAILED DESCRIPTION

[0024] The present invention is further described below

[0025] See also Figure 1-5

[0026] The present invention discloses an energy-absorbing multi-directional limit bridge anti-seismic device with a steel spring, comprising a steel corbel 1, a limiter 2, a steel spring 3, a slider 4 and a connecting steel column 5; the steel corbel 1 is fixed to the side of the top of a pier 25 near a movable bearing of the bridge by bolts 13; the limiter 2 comprises a fixed plate 6, a square steel stopper 7 and two-side tensile steel stoppers 8, the square steel stopper 7 is fixed to the front and rear sides of the upper surface of the fixed plate 6, and a slide rail equal to the width of the slider 4 is formed between the two square steel stoppers 7; the two tensile steel stoppers 8 are in an inverted "L" shape, and are respectively arranged on the left and right sides of the upper surface of the fixed plate 6, and the horizontal section of the tensile steel stopper 8 is aligned with the upper surface of the fixed plate 6. The distance is equal to the height of the slider 4, the steel spring 3 is arranged between the vertical section of the anti-pull-out steel stopper 8 and the end face of the slider 4 and is connected to the two ends of the steel spring 3; the limit member 2 includes the same upper limit member and lower limit member, the fixing plate 6 of the lower limit member is fixed to the top of the steel corbel 1 by the second lower bottom plate bolt 15, and the fixing plate 6 of the upper limit member is fixed to the bottom of the main beam 18 by the first lower bottom plate bolt 14; one end of the connecting steel column 5 is fixed to the bottom of the slider 4 in the upper limit member, and the other end is fixed to the top of the slider 4 in the lower limit member; a movable bridge bearing 23 arranged on a bridge bearing pad stone 24 is provided between the main beam 18 and the pier 25.

[0027] The horizontal sections of the anti-tensile steel stopper 8 are located on both sides of the upper surface of the slider 4, and the distance between the anti-tensile steel stoppers 8 on both sides is less than the length of the slider 4; the bottom of the anti-tensile steel stopper 8 is fixed to the fixed plate 6 through a lower base plate, and the lower base plate is provided with threaded holes for the lower base plate bolts 14, 15 to pass through.

[0028] The steel corbel 1 includes a top plate 10, an inner plate 9, a bottom plate 12, and a web 11. The inner plate 9 is provided with a plurality of bolt holes for fixing it to the top of the side wall of the pier 25; one end of the top plate 10 is vertically connected to the top of the inner plate 9, one end of the bottom plate 12 is vertically connected to the bottom of the inner plate 9, the inner wall of the web 11 is connected to the outer wall of the inner plate 9, and the top and bottom thereof are respectively connected to the lower surface of the top plate 10 and the upper surface of the bottom plate 12.

[0029] Pin heads are provided at both ends of the connecting steel column 5, and through holes are provided on the pin heads for the shaft pin to pass through; grooves 17 for inserting the two ends of the connecting steel column 5 are provided on both sides of the middle of the top of the slider 4, and the cross-section of the groove 17 is a semicircular arc structure. The shape of the groove 17 matches the pin heads at both ends of the connecting steel column 5, and the width of the groove 17 is slightly larger than the width of the pin head; the slider 4 is provided with a connecting hole 16 for the shaft pin to pass through, and the connecting hole 16 is located on both sides of each groove 17 and passes through the front and rear surfaces of the slider 4.

[0030] The middle of the connecting steel column 5 is a cylindrical structure, which is made of energy-absorbing low-yield strength steel. Its yield strength is lower than the yield strength of the pin head, so that it can undergo greater deformation during an earthquake and consume earthquake energy.

[0031] An expansion joint 19 is formed between the main beam 18 and the second main beam 20, and a movable bridge bearing 23 arranged on a bridge bearing pad stone 24 is provided between the main beam 18 and the bridge pier 25. The distance between the two side surfaces of the slider 4 and the inner walls of the vertical sections of the anti-tensile steel blocks 8 on both sides is less than the maximum distance that the movable bridge bearing 23 can move; the distance between the two side surfaces of the slider 4 and the inner walls of the vertical sections of the anti-tensile steel blocks 8 on both sides is less than the width of the expansion joint 19; during an earthquake, the steel springs 3 on both sides play a role first to buffer the seismic energy, and then the relatively large displacement of the beam body is limited by connecting the steel columns 5, thereby protecting the movable bridge bearing 23 from being damaged by a large displacement and protecting the expansion joint 19.

[0032] Working principle: When there is no earthquake, the connecting steel column 5 is in a vertical position and the steel spring 3 is in a natural state without deformation. During an earthquake, the main beam 18 and the bridge pier 25 undergo relatively large displacements, which first drive the slider 4 on the limit member 2 to slide relatively on the fixed plate 6, thereby compressing the steel spring 3 on one side located between the two side surfaces of the slider 4 and the inner walls of the vertical sections of the two side tensile steel stoppers 8, and the steel spring 3 on the other side is stretched, relying on its elastic force to buffer the force of the earthquake, and converting part of the earthquake energy into the elastic potential energy of the steel spring 3, thereby consuming the earthquake energy; when the relative displacement of the main beam 18 and the bridge pier 25 exceeds the distance between the two side surfaces of the slider 4 and the inner walls of the vertical sections of the two side tensile steel stoppers 8, the connecting steel column 5 rotates with the movement of the limit member 2 on the beam body and deforms under the action of tension, and relies on the energy generated by its plastic deformation to consume most of the earthquake energy, thereby limiting the relative displacement of the main beam 18 and the bridge pier 25 (including along the bridge direction, transverse bridge direction and vertical direction); after the earthquake, due to the restoring force of the steel spring 3, but because its recovery capacity is limited, the device can be restored to a state similar to the original state after the earthquake, so as to cope with the next earthquake.

[0033] 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. An energy-absorbing multi-directional limited bridge seismic device with a steel spring, characterized in that: The invention comprises a steel bracket (1), a stopper (2), a steel spring (3), a slider (4) and a connecting steel column (5); the steel bracket (1) is fixed to the side of the top of a pier (25) near a movable bridge support by means of bolts (13); the stopper (2) comprises a fixing plate (6), a square steel stopper (7) and two side tensile steel stoppers (8); the square steel stoppers (7) are fixed to the front and rear sides of the upper surface of the fixing plate (6); a slide rail having the same width as the slider (4) is formed between the two square steel stoppers (7); the two tensile steel stoppers (8) are in an inverted "L" shape and are respectively arranged on the fixing plate (6) and the slider (4) and the two side tensile steel stoppers (8) are respectively arranged on the fixing plate (6) and the two side tensile steel stoppers (7) are respectively arranged on the fixing plate (6 ... On the left and right sides of the upper surface of the fixing plate (6), the distance between the horizontal section of the anti-tensile steel stopper (8) and the upper surface of the fixing plate (6) is equal to the height of the sliding block (4); the steel spring (3) is arranged between the vertical section of the anti-tensile steel stopper (8) and the end surface of the sliding block (4), and the two are respectively connected to the two ends of the steel spring (3); the limiting member (2) includes an upper limiting member and a lower limiting member that are identical; the fixing plate (6) of the lower limiting member is fixed to the top of the steel bracket (1) by bolts, and the fixing plate (6) of the upper limiting member is fixed to the bottom of the main beam (18) by bolts; One end of the connecting steel column (5) is fixed to the bottom of the slider (4) in the upper limit member, and the other end is fixed to the top of the slider (4) in the lower limit member; a movable bridge bearing (23) arranged on a bridge bearing pad stone (24) is provided between the main beam (18) and the pier (25); the horizontal sections of the tensile steel stopper (8) are located on both sides of the upper surface of the slider (4), and the distance between the tensile steel stoppers (8) on both sides is less than the length of the slider (4); the bottom of the tensile steel stopper (8) is fixed to the fixing plate (6) through a lower bottom plate, and the lower bottom plate is provided with a second lower bottom plate bolt (1 5) through which a threaded hole passes; the steel corbel (1) comprises a top plate (10), an inner plate (9), a bottom plate (12), and a web plate (11); the inner plate (9) is provided with a plurality of bolt holes for fixing it to the upper side wall of the pier (25); one end of the top plate (10) is vertically connected to the top of the inner plate (9), one end of the bottom plate (12) is vertically connected to the bottom of the inner plate (9), the inner wall of the web plate (11) is connected to the outer wall of the inner plate (9), and the top and bottom thereof are respectively connected to the lower surface of the top plate (10) and the upper surface of the bottom plate (12).

2. The energy-absorbing multi-directional limited bridge seismic device with a steel spring according to claim 1 is characterized in that: Pin heads are provided at both ends of the connecting steel column (5), and through holes are provided on the pin heads for the shaft pin to pass through; grooves (17) are provided on both sides of the middle of the top of the slider (4) for the two ends of the connecting steel column (5) to be inserted, and the cross-section of the groove (17) is a semicircular arc structure. The shape of the groove (17) matches the pin heads at both ends of the connecting steel column (5), and the width of the groove (17) is slightly larger than the width of the pin head; the slider (4) is provided with connecting holes (16) for the shaft pin to pass through, and the connecting holes (16) are located on both sides of each groove (17) and pass through the front and rear surfaces of the slider (4).

3. The energy-absorbing multi-directional limited bridge seismic device with a steel spring according to claim 2 is characterized in that: The middle of the connecting steel column (5) is a cylindrical structure, made of energy-absorbing low-yield strength steel, and its yield strength is lower than the yield strength of the pin head.

4. The energy-absorbing multi-directional limited bridge seismic device with a steel spring according to claim 1 is characterized in that: An expansion joint (19) is formed between the main beam (18) and the second main beam (20); a movable bridge bearing (23) arranged on a bridge bearing pad stone (24) is provided between the main beam (18) and the bridge pier (25); the distance between the two side surfaces of the slider (4) and the inner walls of the vertical sections of the tensile steel stoppers (8) on both sides is less than the maximum distance that the movable bridge bearing (23) can move; and the distance between the two side surfaces of the slider (4) and the inner walls of the vertical sections of the tensile steel stoppers (8) on both sides is less than the width of the expansion joint (19).

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