CN112391938A - Swing type buffering energy-consumption type bridge anti-seismic stop block structure - Google Patents
Swing type buffering energy-consumption type bridge anti-seismic stop block structure Download PDFInfo
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- CN112391938A CN112391938A CN202011230280.7A CN202011230280A CN112391938A CN 112391938 A CN112391938 A CN 112391938A CN 202011230280 A CN202011230280 A CN 202011230280A CN 112391938 A CN112391938 A CN 112391938A
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- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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Abstract
本发明属于桥梁抗震技术领域，具体涉及一种摇摆式缓冲耗能型桥梁抗震挡块结构，包括钢牛腿和挡块结构，所述钢牛腿固定在活动支座附近的桥墩顶部的侧面，所述挡块结构固定在钢牛腿顶部，包括钢底板、耗能型低屈服点钢板、限位块、摇摆杆以及固定钢板。本发明桥梁抗震挡块结构能有效限制梁体和桥墩之间的较大位移，防止梁体发生顺桥向和横桥向落梁危害以及梁体竖向脱离支座危害，减小活动支座和伸缩缝的损坏，同时该抗震挡块结构布置在每一活动支座附近，碰撞位置分散，数量多，能有效减小作用在每一挡块结构上的地震力。挡块块体包含一块耗能型低屈服点钢板，通过塑性变形消耗部分地震能量。
The invention belongs to the technical field of bridge anti-seismic, and in particular relates to an anti-seismic block structure of a swing-type buffer and energy-consuming bridge, comprising a steel corbel and a block structure, wherein the steel corbel is fixed on the side of the top of the bridge pier near the movable support, The block structure is fixed on the top of the steel corbel, and includes a steel bottom plate, an energy-consuming low-yield point steel plate, a limit block, a rocking rod and a fixed steel plate. The bridge anti-seismic block structure of the invention can effectively limit the large displacement between the beam body and the bridge pier, prevent the beam body from falling along the bridge direction and the transverse bridge direction and the beam body from the vertical separation of the bearing, and reduce the movable bearing. At the same time, the seismic block structure is arranged near each movable support, and the collision positions are scattered and the number is large, which can effectively reduce the seismic force acting on each block structure. The block body contains an energy-consuming low-yield-point steel plate, which consumes part of the seismic energy through plastic deformation.
Description
Technical Field
The invention belongs to the technical field of bridge seismic resistance, and particularly relates to a swing type buffering energy-consumption bridge seismic stop block structure for a bridge and an arrangement method.
Background
In order to improve the transportation efficiency of the road, protect the ecological environment along the road and save land resources, the idea of replacing the road with a bridge will lead the future infrastructure construction. However, China is located among a plurality of earthquake zones and is a country with multiple earthquakes. When an earthquake occurs, firstly, the life and property safety of people is greatly threatened, and on the other hand, the earthquake causes serious damage to bridge engineering in an earthquake area, so that the external traffic of the earthquake affected area is cut off, an island effect is caused, great difficulty is caused to disaster relief work after the earthquake, subsequent secondary disasters are caused, and indirect economic loss is more serious.
Therefore, the research work of bridge seismic resistance and damping technology is carried out, and the method has important practical significance and theoretical value for improving the seismic resistance, especially the capability of resisting large earthquakes and improving the resistance of the whole country to natural disasters such as earthquakes. In earth quakes that have occurred in the past decades, the modes of seismic damage of bridges have mainly included: the support is damaged; if the displacement of the upper beam body of the beam bridge exceeds the supporting surface of the bridge pier, the landing beam can be caused to shake (including the transverse bridge direction and the forward bridge direction); when the upper beam body falls down, if the upper beam body impacts the bridge pier, the lower structure is greatly damaged by collision; local damage caused by collision of adjacent beam bodies at the expansion joint; the relatively large collision force at the expansion joint can also transmit the collision force effect at the expansion joint to the bottom of the bridge pier, so that the bottom of the bridge pier is damaged; the local damage of bridge antidetonation dog self to lose the antidetonation function of dog.
The collapse of the bridge in the earthquake can bring a lot of harm, but China still has many bridges designed according to the original design standard or damaged to a certain extent, and the bridges can not meet the social requirements of large quantity of vehicles and heavy transportation weight at present, and a large amount of manpower and material resources are needed for reinforcing or reconstructing the bridges.
In order to limit the transverse displacement of the beam body at the upper part of the bridge, reinforced concrete stop blocks are usually arranged on two sides of the top of a pier capping beam, but the collision between the common reinforced concrete stop blocks and the beam body is rigid collision, the impact force is very large, the beam body and the concrete stop blocks are easily damaged locally, the horizontal shearing force of the reinforced concrete stop blocks in an earthquake is usually insufficient, the stop blocks are easily damaged irreparably, and the displacement of the beam body cannot be well limited. Meanwhile, the seismic waves have three directions, and the displacement of the beam body is limited in a single direction.
Aiming at the defects, a novel anti-seismic stop block structure capable of being limited in multiple directions needs to be designed and developed, the displacement of the upper beam body can be limited in the transverse bridge direction, the forward bridge direction and the vertical bridge direction, energy consumption can be buffered, and the damage of the stop block is reduced while the displacement of the beam body is limited by a large margin.
Disclosure of Invention
In view of the defects in the prior art, the invention designs and develops a rocking type buffering energy-consumption type bridge anti-seismic stop block structure, which limits overlarge displacement between an upper main beam and a lower pier in the bridge along the bridge direction and the transverse bridge direction, and prevents the bridge body from falling into the bridge along the bridge direction and the transverse bridge direction; the collision between adjacent beams at the expansion joint is transferred to a plurality of bridge anti-seismic stop blocks, so that the expansion impact damage at the expansion joint and the local damage of a collision area between adjacent beam bodies are reduced, and the purpose of protecting the expansion joint is achieved; collision positions between the beam body and the stop blocks are increased and dispersed, so that collision force acting on each stop block structure is greatly reduced, and local damage of the stop block structures is reduced; as much seismic energy as possible is consumed. The invention can also prevent the vertical collision damage of the beam body and the support, so that the support has smaller self damage when vertically colliding with the beam body.
In order to realize the purpose of the invention, the invention adopts the technical scheme that:
a swinging type buffering energy-consumption type bridge anti-seismic stop block structure comprises a steel corbel and a stop block structure, wherein the steel corbel is fixed above the side wall of a bridge pier through a steel corbel side plate bolt; the stop block structure comprises a steel bottom plate, an energy-consuming type low-yield-point steel plate and a swing rod, the steel bottom plate is fixed to the top of the steel bracket, the swing rod consists of an upper rod and a lower rod, the upper rod and the lower rod are hinged, the top end of the upper rod is fixed to the bottom of the main beam or the second main beam, and the bottom end of the lower rod is fixed to the steel floor; the energy-consuming type low-yield-point steel plates are arranged on two sides of the rocking rod and used for limiting the swing range of the upper rod.
The energy-consuming type low-yield-point steel plate comprises a main plate, two side plates and a stiffening rib, wherein the stiffening rib is welded between the two side plates and is parallel to the steel bottom plate; one side wall of each of the two side plates is fixedly connected with two sides of the inner wall of the main plate; the height of the side plate is smaller than that of the main plate.
A plurality of limit blocks combined into a tooth shape are arranged at the top of the main board, and gaps for inserting the upper rods are formed among the limit blocks; the limiting block is a rubber buffer block.
A gap is arranged between the main plate and the rocking rod.
The top of the upper rod is fixed at the bottom of the main beam or the second main beam through a fixed steel plate.
An expansion joint is formed between the main beam and the second main beam, a bridge movable support arranged on a second support base stone is arranged between the second main beam and the bridge pier, the horizontal swing distance of the swing rod is smaller than the maximum distance that the bridge movable support can move, and the horizontal swing distance of the swing rod is smaller than the width of the expansion joint.
The yield strength of the energy-consuming type low-yield-point steel plate in the block is lower than that of other steel materials except the energy-consuming type low-yield-point steel plate in the block, and the yield strength of the other steel materials except the energy-consuming type low-yield-point steel plate in the block is the same as that of the steel materials forming the steel bracket, the steel bottom plate and the fixed steel plate.
The steel corbel comprises a top plate, an inner side plate, a bottom plate and a web plate, wherein the inner side plate is provided with a plurality of bolt holes for fixing the inner side plate above the side wall of the pier; the one end of roof and the top mutually perpendicular of interior plate be connected the one end of bottom plate with the bottom mutually perpendicular of interior plate is connected, the inside wall of web with the outer wall mutually perpendicular of interior plate is connected, its top and bottom respectively with the lower surface of roof and the upper surface of bottom plate link to each other.
The plurality of stop block structures are arranged on one side of the bridge movable support along the transverse bridge direction, and the stop block structures are distributed in a dispersed mode.
The invention has the beneficial effects that:
1) the invention can realize multi-directional limiting. Under the effect of three-dimensional seismic waves, the bridge girder body is all vibrating in the same direction as the bridge, horizontal bridge is to and vertically, near each movable support seat installation rocking energy dissipation buffer type bridge antidetonation dog, utilize rocking bar can restrict the relatively great displacement of upper portion girder body in three direction simultaneously in the same direction as the swing of bridge to swing and stopper, the protection support prevents that the girder body from damaging with the warp that the girder body takes place apart from the support in the same direction as the bridge, the roof beam that falls of horizontal bridge to damage, prevent that the vertical collision of the girder body and support from damaging. The stop blocks are large in number and distributed in mounting positions, seismic force acting on each stop block structure can be effectively reduced, and local damage of the stop blocks and damage of the bottoms of the piers are reduced.
2) The invention has certain functions of buffering and consuming seismic energy. On one hand, when an earthquake occurs, the swinging rod moves and swings along the bridge, and collides with the energy-consuming type low-yield-point steel plate. Under the action of medium and small earthquakes, the energy-consuming type low-yield-point steel plate in the block body of the block is in an elastic stage by small impact force, and the elastic stage is similar to that of a common reinforced concrete block and belongs to rigid impact; however, under the action of a large earthquake, the energy-consuming type low-yield-point steel plate can enter a plasticity stage due to a large collision force, at the moment, the collision belongs to flexible collision, so that the local damage of a collision area and the damage transmitted to the bottom of a pier can be effectively reduced, a part of earthquake energy can be consumed by virtue of the plastic deformation of the energy-consuming type low-yield-point steel plate in the block, the damage of the earthquake to other components of the bridge is reduced, and the stiffening ribs arranged on the two side plates of the energy-consuming type low-yield-point steel plate enable the steel plate not to be easily subjected to. On the other hand, bond the stopper on the mainboard and be rubber buffer block essentially, can restrict the roof beam body and at the great displacement of horizontal bridge to, utilize rubber materials's buffering characteristic can reduce the impact that horizontal bridge applyed to the rocking beam greatly simultaneously, rely on rubber buffer block's plastic deformation to consume partly seismic energy.
3) The invention has the advantages of low material price, simple structure, convenient construction, easy detection and maintenance, and the like.
Drawings
FIG. 1 is a schematic representation of a forward-to-bridge arrangement of the present invention;
FIG. 2 is a transverse bridging layout of the present invention;
FIG. 3 is an enlarged view of a portion of FIG. 1;
FIG. 4 is a schematic three-dimensional construction of the present invention;
FIG. 5 is a schematic side view of the present invention;
FIG. 6 is a schematic structural view of an energy-consuming type low-yield-point steel plate according to the present invention;
FIG. 7 is a schematic view of the structure of the rocking beam of the present invention.
In the figure: 1 steel corbel, 2 dog structures, 3 steel bottom plates, 4 rocking bars, 5 upper rods, 6 lower rods, 7 main plates, 8 side plates, 9 limiting blocks, 10 fixed steel plates, 11 stiffening ribs, 12 top plates, 13 inner side plates, 14 webs, 15 bottom plates, 16 steel corbel side plate bolts, 17 fixed plate bolts, 18 main beams, 19 expansion joints, 20 second main beams, 21 bridge fixed supports, 22 bridge support base stones, 23 bridge movable supports, 24 second support base stones and 25 piers.
Detailed Description
The invention is further illustrated below:
please refer to fig. 1-7.
The invention discloses a swinging type buffering energy-consumption type bridge anti-seismic stop block structure which comprises a steel bracket 1 and a stop block structure 2, wherein the steel bracket 1 is fixed above the side wall of a pier 25 near a movable support 23 through a steel bracket side plate bolt 16, the stop block structure 2 is fixed at the top of the steel bracket 1 through a bolt, and is fixed at the bottom of a main beam 18 or a second main beam 20 through a fixed steel plate 10 connected with a swinging rod 4; the stop block structure 2 comprises a steel bottom plate 3, an energy-consuming type low-yield-point steel plate, a limiting block 9, a swinging rod 4 and a fixed steel plate 10.
The steel corbel 1 is arranged on the side face of the top of the pier 25, so that the installation space of the stop block structure 2 can be increased, and the stop block structure 2 can be adapted to different sizes by adjusting the vertical installation height of the steel corbel 1. The steel corbel 1 comprises a top plate 12, an inner side plate 13, a bottom plate 15 and a web plate 14, wherein the inner side plate 13 is provided with a plurality of bolt holes for fixing the inner side plate above the side wall of the pier 25; the one end of roof and the top mutually perpendicular of interior plate be connected the one end of bottom plate with the bottom mutually perpendicular of interior plate is connected, the inside wall of web with the outer wall mutually perpendicular of interior plate is connected, its top and bottom respectively with the lower surface of roof 12 and the upper surface of bottom plate 15 link to each other. The steel material selected by the steel bracket 1 can be Q235 steel, Q345 steel, Q390 steel or Q420 steel.
The steel bottom plate 3 is fixed on the top of the steel bracket 1 through bolts and symmetrically distributed on the top of the steel bracket 1. 3 periphery welding of steel bottom plate has the low yield point steel sheet of power consumption type, the low yield point steel sheet of power consumption type comprises mainboard 7, two curb plates 8 and stiffening rib 11, and the welding of stiffening rib 11 is in the middle of the board of both sides, and is parallel with steel bottom plate 3, and stiffening rib 11 makes the difficult local buckling that takes place of steel sheet, avoids the local damage of whole dog structure 2. The energy-consuming type low-yield-point steel plate can adopt low-yield-point steel with yield point of 160MPa or 100 MPa. The yield strength of the energy-consuming type low-yield-point steel plate is lower than that of steel materials used for the steel corbel 1, the steel bottom plate 3 and the fixed steel plate 10 (except the energy-consuming type low-yield-point steel plate). The energy dissipating low yield point steel 26 may operate normally on its hysteresis curve in large earthquakes.
The swing rod 4 consists of an upper rod 5 and a lower rod 6, the two rods are hinged, and the lower rod 6 is a fixed rod and is directly welded with the steel bottom plate 3; the upper rod 5 is a movable rod and can swing for a certain angle along the bridge direction. The rocking bars 4 are symmetrically distributed on the steel bottom plate 3, and each side of the rocking bars is provided with two rocking bars 4. The top of the energy-consuming type low-yield-point steel plate main plate 7 is provided with a sawtooth limiting block 9; the sawtooth limiting block 9 is essentially a rubber buffer block, is in sawtooth shape and is bonded on the top of the main board 7 to form two notches, and can limit the larger displacement of the rocking rod 4 in the direction along the bridge direction and the direction along the transverse bridge direction. In addition, the rubber buffer block can consume a part of seismic energy by depending on the hysteresis curve of the rubber buffer block, and the damage of the earthquake to other components of the bridge is reduced.
The preferred clearance between the main plate 7 and the rocking beam 4 is 150 mm-200 mm.
An expansion joint 19 is formed between the main beam 18 and the second main beam 20, a bridge movable support 23 arranged on a second support cushion 24 is arranged between the second main beam 20 and the pier 25, the horizontal swing distance of the swing rod 4 is smaller than the maximum distance that the bridge movable support 23 can move, and the horizontal swing distance of the swing rod 4 is smaller than the width of the expansion joint 19.
The plurality of block structures 2 are transversely arranged near each bridge movable support 23 in the bridge direction, and the block structures 2 are arranged more and more dispersedly, so that the seismic force acting on each block structure 2 can be effectively reduced, and the damage to the block structures 2 is reduced.
The working principle is as follows: under the condition that no earthquake occurs, the swinging rod 4 is perpendicular to the steel bottom plate 3, the upper rod 5 and the lower rod 6 are positioned on the same straight line, and the steel plates and the rubber buffer blocks are not obviously deformed and are in an initial state. Under the action of an earthquake, the main beam 18 and the bridge pier 25 are relatively displaced along the bridge direction to drive the upper rod 5 connected with the main beam 18 to swing for a certain distance along the bridge direction, and when the limit distance is reached (the limit distance refers to the distance between the upper rod 5 and the main board 7), the upper rod 5 on one side of displacement just falls into a gap formed by the limit block 9 and collides with the main board 7. Under the action of medium and small earthquakes, the energy-consuming type low-yield-point steel plate in the block body of the block is in an elastic stage by small impact force, and the elastic stage is similar to that of a common reinforced concrete block and belongs to rigid impact; however, under the action of a large earthquake, the energy-consuming type low-yield-point steel plate enters a plasticity stage due to large collision force, and at the moment, the collision belongs to flexible collision.
In the collision process, on one hand, the relative displacement of the main beam 18 of the bridge and the pier 25 along the bridge direction is limited, the movable support 23 is protected from being damaged due to large displacement, and the expansion joint 19 is protected from being damaged due to collision between the main beam 18 of the bridge and the other main beam of the bridge; on the other hand, the earthquake energy is effectively buffered by utilizing the plastic deformation of the energy-consuming type low-yield-point steel plate, and the damage to other components of the bridge is reduced. Because the swing rod 4 falls into the notch, the displacement in the transverse bridge direction is limited, and when the swing rod 4 collides with the limiting block 9 due to overlarge collision force, the collision force can be greatly buffered due to the small collision rigidity of the rubber material, so that the swing rod 4 is not separated from the notch.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent modifications made by the present invention and the contents of the drawings or directly or indirectly applied to the related technical fields are included in the scope of the present invention.
Claims (8)
1. The utility model provides a formula buffering power consumption type bridge antidetonation dog structure sways which characterized in that: the bridge pier structure comprises a steel corbel (1) and a stop block structure (2), wherein the steel corbel (1) is fixed above the side wall of the bridge pier (25) through a steel corbel side plate bolt (16); the stop block structure (2) comprises a steel bottom plate (3), an energy-consuming type low-yield-point steel plate and a swing rod (4), the steel bottom plate (3) is fixed to the top of the steel corbel (1), the swing rod (4) consists of an upper rod (5) and a lower rod (6), the upper rod (5) is hinged to the lower rod (6), the top end of the upper rod (5) is fixed to the bottom of a main beam (18) or a second main beam (20), and the bottom end of the lower rod (6) is fixed to the steel bottom plate (3); the energy-consuming type low-yield-point steel plates are arranged on two sides of the swing rod (4) and used for limiting the swing range of the upper rod (5).
2. The rocking type buffering energy-dissipating type bridge anti-seismic stop structure according to claim 1, wherein: the energy-consuming type low-yield-point steel plate comprises a main plate (7), two side plates (8) and a stiffening rib (11), wherein the stiffening rib (11) is welded between the two side plates (8) and is parallel to the steel bottom plate (3); one side wall of each side plate (8) is fixedly connected with two sides of the inner wall of the main plate (7); the height of the side plate (8) is smaller than that of the main plate (7).
3. The rocking type buffering energy-dissipating type bridge anti-seismic stop structure according to claim 2, wherein: a plurality of limit blocks (9) combined into a tooth shape are arranged at the top of the main board (7), and gaps for inserting the upper rods (6) are formed among the limit blocks (9); the limiting block (9) is a rubber buffer block.
4. The rocking type buffering energy-dissipating type bridge anti-seismic stop structure according to claim 3, wherein: a gap is arranged between the main plate (7) and the rocking rod (4).
5. The rocking type buffering energy-dissipating type bridge anti-seismic stop structure according to claim 4, wherein: the top of the upper rod (6) is fixed at the bottom of the main beam (18) or the second main beam (20) through a fixed steel plate (10).
6. The rocking type buffering energy-dissipating type bridge anti-seismic stop structure according to claim 5, wherein: form expansion joint (19) between girder (18) and second girder (20), second girder (20) with be equipped with between pier (25) and set up in bridge movable support (23) on second support stone (24), the horizontal swing distance of rocking rod (4) is less than the maximum distance that bridge movable support (23) can remove, the horizontal swing distance of rocking rod (4) is less than the width of expansion joint (19).
7. The rocking type buffering energy-dissipating type bridge anti-seismic stop structure according to claim 6, wherein: the steel corbel (1) comprises a top plate (12), an inner side plate (13), a bottom plate (15) and a web plate (14), wherein the inner side plate (13) is provided with a plurality of bolt holes (16) for fixing the inner side plate above the side wall of the pier (25); the one end of roof (12) and the top mutually perpendicular of interior plate (13) be connected the one end of bottom plate (15) with the bottom mutually perpendicular of interior plate (13) is connected, the inside wall of web (14) with the outer wall mutually perpendicular of interior plate (13) is connected, its top and bottom respectively with the lower surface of roof (12) and the upper surface of bottom plate (15) link to each other.
8. The rocking type buffering energy-dissipating type bridge anti-seismic stop structure according to claim 7, wherein: the plurality of block structures (2) are arranged on one side of the bridge movable support (23) along the transverse bridge direction, and the block structures (2) are distributed dispersedly.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011230280.7A CN112391938A (en) | 2020-11-06 | 2020-11-06 | Swing type buffering energy-consumption type bridge anti-seismic stop block structure |
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| CN202011230280.7A CN112391938A (en) | 2020-11-06 | 2020-11-06 | Swing type buffering energy-consumption type bridge anti-seismic stop block structure |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113789715A (en) * | 2021-09-17 | 2021-12-14 | 南昌大学 | A sliding damping shock absorption limit device suitable for bridges |
| CN117385729A (en) * | 2023-11-28 | 2024-01-12 | 中交第二公路勘察设计研究院有限公司 | A kind of anti-seismic block connected by steel cable and its construction method |
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Application publication date: 20210223 |
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