Shock insulation plate type rubber support for highway bridge

Abstract

The invention relates to a shock insulation plate type rubber support for a highway bridge. The shock insulation plate type rubber support comprises a protective rubber sleeve, an embedded steel plate, a seal coat steel plate and an anchor rod, the seal steel plates are coaxially and fixedly connected to the upper end and the lower end of the protective rubber sleeve respectively; the embedded steel plates are coaxially and fixedly connected to the outer side surfaces of the sealing steel plates at the two ends respectively; anchor rods are fixedly connected above the four corner areas of the upper end pre-embedded steel plate and below the four corner areas of the lower end pre-embedded steel plate respectively; the upper-end pre-embedded steel plate is fixedly connected with the bottom of a bridge through an anchor rod, and the lower-end pre-embedded steel plate is fixed to the top of an abutment through an anchor rod; a plurality of steel plate layers are evenly distributed in the protective rubber sleeve in the axial direction, and a rubber layer is arranged between every two adjacent steel plate layers. According to the support, corrosion of the steel plate layers can be protected through the rubber layers above and below the steel plate layers and around the steel plate layers, the steel plate layers embedded between the rubber layers can limit transverse deformation of the rubber layers under the action of vertical loads, and therefore the vertical rigidity of the support is improved, and meanwhile the damping energy dissipation mechanism is matched to effectively improve the cushioning capacity of the support in the vertical direction.

Description

Technical Field

[0001] The invention relates to the technical field of rubber bearings, and in particular to a seismic isolation plate type rubber bearing for a highway bridge. Background Art

[0002] The seismic isolation plate rubber bearing for highway bridges originated in the mid-20th century. With the continuous advancement of modern bridge construction technology and the increasing requirements for bearing performance, it has gradually been widely used in bridge engineering. It is mainly composed of multiple layers of rubber sheets and thin steel plates alternately stacked and vulcanized. It has good elasticity, sufficient vertical stiffness and large shear deformation capacity. It can not only reliably transmit the reaction force of the superstructure to the pier, but also complete the deformation required by the beam structure, effectively respond to bridge deformation, shock absorption and isolation, and ensure the safety and stability of the bridge. In addition, by adhering a layer of polytetrafluoroethylene plate on the surface of the bearing, a polytetrafluoroethylene skateboard type rubber bearing can be made, so that its horizontal displacement is not restricted, which is suitable for bridges with large displacements such as large spans and multi-span continuous bridges.

[0003] After searching, the Chinese patent with patent number CN216838948U discloses a road bridge seismic isolation plate type rubber bearing, including an upper connecting plate, a rubber bearing body and a lower connecting plate arranged in sequence from top to bottom, the rubber bearing body includes a rubber body, the top surface of the rubber body is embedded with an upper sealing plate, the bottom surface of the rubber bearing body is embedded with a lower sealing plate, and a plurality of horizontal steel plates are evenly distributed inside the rubber body, and the adjacent horizontal steel plates are connected by a plurality of memory springs, and the memory springs are composed of two shape memory alloy wires forming a double helix structure. The bearing has good seismic resistance and can improve the bearing's resistance to horizontal deformation by arranging memory springs between adjacent horizontal steel plates through the high elasticity and high recovery ability of the memory alloy. Compared with the prior art, this patent can solve the problems of the existing ordinary plate type rubber bearings, such as low seismic resistance, deformation after long-term use, and inability to recover by themselves.

[0004] However, in actual use of the technical solution disclosed in the above patent, although the rubber bearing has a large shear deformation capacity and can meet the horizontal displacement of the upper structure, and the lead core in the center of the rubber bearing can improve the damping performance of the rubber bearing, large upper structures such as bridges often have vehicles running, so the bearing will also be subjected to a large amount of vertical impact, and the lead core rubber bearing cannot dissipate the vertical impact well. Summary of the invention

[0005] In view of the above problems, the object of the present invention is to provide a highway bridge seismic isolation plate type rubber bearing, which can effectively improve the vertical shock absorbing capacity of the bearing.

[0006] The technical solution adopted by the present invention is as follows:

[0007] A seismic isolation plate-type rubber bearing for a highway bridge proposed in the present invention comprises a protective rubber sleeve, an embedded steel plate, a sealing steel plate and an anchor rod; the sealing steel plate is coaxially fixed to the upper and lower ends of the protective rubber sleeve respectively; the embedded steel plates are coaxially fixed to the outer surfaces of the sealing steel plates at both ends respectively; anchor rods are fixed above the four corner areas of the upper embedded steel plate and below the four corner areas of the lower embedded steel plate respectively; the upper embedded steel plate is fixed to the bottom of the bridge by the anchor rod, and the lower embedded steel plate is fixed to the top of the pier by the anchor rod; a plurality of steel plate layers are evenly distributed axially inside the protective rubber sleeve, and a rubber layer is arranged between two adjacent steel plate layers.

[0008] Furthermore, a dust ring is provided between the sealing layer steel plate and the end of the protective rubber sleeve.

[0009] Furthermore, anchor sleeves and anchor bolts are respectively provided at the upper and lower ends of the connection between the anchor rod and the embedded steel plate; the anchor sleeves and anchor bolts are respectively located on the two side surfaces of the embedded steel plate and are both threadedly connected to the anchor rod.

[0010] Furthermore, an axial through hole is arranged at the axial center of the protective rubber sleeve, and a damping energy dissipation mechanism is arranged inside the axial through hole, and the top end of the damping energy dissipation mechanism is correspondingly slidably connected with the upper sealing layer steel plate.

[0011] Furthermore, the damping energy dissipation mechanism includes an outer damping shell, an inner damping shell, an impact connector, a sealing baffle I, a sealing baffle II, a guide rod, a piston and a sealing plate; the outer damping shell is coaxially fixed to the outer side of the lower area of ​​the inner damping shell; the outer damping shell and the inner damping shell are correspondingly coaxially fixed inside the axial through hole of the protective rubber sleeve; the guide rod is coaxially arranged inside the inner damping shell, and the upper and lower ends of the inner damping shell are respectively provided with sealing plates that slide with the guide rod; the top end of the guide rod passes through the sealing plate and is coaxially fixed to the bottom of the impact connector; the impact The impact joint is slidably connected with the upper sealing steel plate; the sealing baffle I, sealing baffle II and piston are coaxially arranged on the outside of the part of the guide rod located in the inner damping shell from top to bottom; the outer rings of the sealing baffle I and sealing baffle II are fixedly connected with the inner wall of the inner damping shell, and the inner rings are slidably matched with the guide rod; the inner ring of the piston is fixedly connected with the guide rod, and the outer ring is slidably matched with the inner wall of the inner damping shell; an oil chamber is formed between the sealing baffle II and the lower sealing plate, and the piston divides the oil chamber into two; the end face of the piston is provided with axial damping holes evenly distributed around the circumference.

[0012] Furthermore, the oil chamber is filled with a damping medium, the damping medium is separated on two sides by a piston, and the damping hole is used for the damping medium to pass through.

[0013] Furthermore, a micro-displacement amplifier is interspersed and arranged on the upper part of the guide rod located in the inner damping shell.

[0014] Furthermore, the steel plate layer and the rubber layer are overlapped and bonded by pressure vulcanization.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. In the present invention, the steel plate layer and the rubber layer inside the protective rubber sleeve are overlapped and bonded together by pressure vulcanization, and the rubber layers above, below and around the steel plate layer can protect the steel plate layer from corrosion. Under the action of vertical load, the steel plate layer embedded between the rubber layers will limit the lateral deformation of the rubber layer, thereby improving the vertical stiffness of the support. In addition, a damping and energy dissipation component is also arranged inside the protective rubber sleeve. The vertical impact transmitted by the vehicle traveling on the bridge can be well absorbed by the damping and energy dissipation component, thereby effectively improving the vertical shock absorption capacity of the support.

[0017] 2. In the present invention, four anchor rods are respectively arranged on the upper part of the upper embedded steel plate and the bottom part of the lower embedded steel plate, and the anchor rods can be firmly fixed by the anchor rod sleeves and anchor bolts arranged at both ends of the anchor rods, thereby effectively improving the stability of the support during the installation process, and dustproof rings are arranged at the connection between the protective rubber sleeve and the sealing steel plate. The dustproof rings can effectively prevent small particles of impurities such as sand and dust from entering the connection gap of the protective rubber sleeve, thereby affecting the overall connection stability of the support. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the relative position structure of the present invention, the bridge and the pier;

[0019] Figure 2 It is a schematic diagram of the upper structure of the present invention;

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

[0021] Figure 4 It is a schematic diagram of the internal structure of the protective rubber sleeve in the present invention;

[0022] Figure 5 It is a structural schematic diagram of the damping energy dissipation mechanism in the present invention;

[0023] Figure 6 It is a schematic diagram of the internal structure of the damping energy dissipation mechanism in the present invention.

[0024] Among them, the figure markings are: 1-protective rubber sleeve; 2-bridge; 3-pier; 4-upper embedded steel plate; 5-lower sealing steel plate; 6-lower embedded steel plate; 7-upper anchor rod; 8-anchor rod sleeve; 9-anchor bolt; 10-lower anchor rod; 11-dustproof ring; 12-upper sealing steel plate; 13-steel plate layer; 14-rubber layer; 15-external damping shell; 16-impact connector; 17-oil chamber; 18-guide rod; 19-piston; 20-damping hole; 21-sealing plate; 22-micro-displacement amplifier; 23-inner damping shell; 24-sealing partition I; 25-sealing partition II. DETAILED DESCRIPTION

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] It should be noted that, in the description of the present invention, the terms "up", "down", "top", "bottom", "one side", "the other side", "left", "right", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not mean that the device or element must have a specific orientation, be constructed and operated in a specific orientation.

[0027] See attached Figure 1 The specific structure of an embodiment of a highway bridge seismic isolation plate rubber bearing proposed by the present invention is given. The bearing includes a protective rubber sleeve 1, an upper embedded steel plate 4, a lower sealing layer steel plate 5, a lower embedded steel plate 6, an upper anchor rod 7, a lower anchor rod 10 and an upper sealing layer steel plate 12.

[0028] Among them, the protective rubber sleeve 1 is a hollow cylindrical structure; the upper sealing steel plate 12 and the lower sealing steel plate 5 are coaxially fixed at the upper and lower ends of the protective rubber sleeve 1 respectively; the upper embedded steel plate 4 is coaxially fixed to the upper surface of the upper sealing steel plate 12; the lower embedded steel plate 6 is coaxially fixed to the lower surface of the lower sealing steel plate 5; upper anchor rods 7 are fixedly connected above the four corner areas of the upper embedded steel plate 4; lower anchor rods 10 are fixedly connected below the four corner areas of the lower embedded steel plate 6; the upper embedded steel plate 4 is fixedly connected to the bottom of the bridge 2 through the upper anchor rods 7, and the lower embedded steel plate 6 is fixed to the top of the pier 3 through the lower anchor rods 10.

[0029] A plurality of steel plate layers 13 are evenly distributed axially inside the protective rubber sleeve 1 , the outer diameter of the steel plate layer 13 matches the inner diameter of the protective rubber sleeve 1 , and a rubber layer 14 is arranged between two adjacent steel plate layers 13 ; the steel plate layers 13 and the rubber layers 14 are overlapped and bonded together by pressure vulcanization.

[0030] The support is arranged between the bridge 2 and the pier 3 to have a seismic isolation effect, which can reduce the impact of live load and seismic force.

[0031] In this embodiment, dust rings 11 are provided between the upper sealing steel plate 12 and the lower sealing steel plate 5 and the ends of the protective rubber sleeve 1. The dust ring 11 can surround the connection gap of the protective rubber sleeve 1, thereby effectively preventing small particles of impurities such as sand and dust from entering the connection gap of the protective rubber sleeve 1, thereby avoiding affecting the overall connection stability of the support.

[0032] Anchor sleeves 8 and anchor bolts 9 are respectively provided at the upper and lower ends of the connection between the upper anchor rod 7 and the upper embedded steel plate 4; the anchor sleeves 8 and anchor bolts 9 are respectively located on both sides of the upper embedded steel plate 4 and are both threadedly connected to the upper anchor rod 7; wherein, the anchor bolts 9 are threadedly connected to the bottom end of the upper anchor rod 7, and the bolt heads are correspondingly attached to the lower surface of the upper embedded steel plate 4; the anchor sleeves 8 are threadedly connected to the lower outer side of the upper anchor rod 7, and the lower end of the anchor sleeves 8 is correspondingly attached to the upper surface of the upper embedded steel plate 4. The lower anchor rod 10 is also fixedly connected to the lower embedded steel plate 6 through the anchor sleeves 8 and anchor bolts 9, and the connection method is the same as the connection method between the upper anchor rod 7 and the anchor sleeves 8 and anchor bolts 9.

[0033] By means of the anchor sleeve 8 and the anchor bolt 9 threadedly connected to the ends of the upper anchor rod 7 and the lower anchor rod 10, the upper anchor rod 7 and the lower anchor rod 10 can be firmly fixed to the surface of the upper embedded steel plate 4 and the lower embedded steel plate 6, thereby effectively improving the stability of the support during the installation process.

[0034] In this embodiment, an axial through hole is arranged at the axial center of the protective rubber sleeve 1 , and a damping energy dissipation mechanism is arranged inside the axial through hole. The top end of the damping energy dissipation mechanism is coaxially slidably connected with the upper sealing layer steel plate 12 .

[0035] Among them, the damping energy dissipation mechanism includes an outer damping shell 15, an inner damping shell 23, an impact connector 16, a sealing partition I24, a sealing partition II25, a guide rod 18, a piston 19 and a sealing plate 21; the outer damping shell 15 is coaxially fixed to the outer side of the lower area of ​​the inner damping shell 23; the outer damping shell 15 and the inner damping shell 23 are correspondingly coaxially fixed inside the axial through hole of the protective rubber sleeve 1; the guide rod 18 is coaxially arranged inside the inner damping shell 23, and the upper and lower ends of the inner damping shell 23 are respectively fixed with sealing plates 21 that slide with the guide rod 18; the top end of the guide rod 18 passes through the upper end sealing plate 21 and is coaxially fixed to the bottom of the impact connector 16; the impact connector is a disc structure; the impact connector 16 is correspondingly coaxially slidably connected with the upper sealing layer steel plate 12.

[0036] The sealing baffle I24, sealing baffle II25 and piston 19 are coaxially arranged in sequence from top to bottom on the outside of the part of the guide rod 18 located in the inner damping shell; the outer rings of the sealing baffle I24 and sealing baffle II25 are fixedly connected to the inner wall of the inner damping shell 23, and the inner rings are slidingly matched with the guide rod 18; the inner ring of the piston 19 is fixedly connected to the guide rod 18, and the outer ring is slidingly matched with the inner wall of the inner damping shell 23; the inner damping shell 23 can be sealed by the sealing plate 21.

[0037] An oil chamber 17 is formed between the sealing partition II25 and the lower sealing plate 21, and the piston 19 divides the oil chamber 17 into two parts; a plurality of axial damping holes 20 evenly distributed around the circumference are arranged on the end surface of the piston 19. The oil chamber 17 is filled with damping medium, which is separated into two sides by the piston 19, and the damping holes 20 are for the damping medium to pass through.

[0038] In this embodiment, a micro-displacement amplifier 22 is inserted and arranged on the outer side of the upper portion of the guide rod 18 located in the inner damping shell 23. The micro-displacement amplifier 22 is an existing device.

[0039] The interior of the protective rubber sleeve 1 is configured as a multi-layer steel plate structure, which can limit the lateral movement of the rubber layer 14. The damping and energy dissipation mechanism arranged inside the protective rubber sleeve 1 can dissipate energy for vertical impact. There is a certain activity space between the damping and energy dissipation mechanism and the multi-layer steel plate structure and the rubber layer 14. The activity space can be used for the steel plate layer 13 to undergo lateral displacement, thereby preventing the damping and energy dissipation mechanism from being offset when the steel plate layer 13 undergoes displacement.

[0040] The rubber layers on the upper and lower sides of the steel plate layer 13 and the rubber sleeves on both sides can protect the steel plate layer 13 from corrosion. Under the action of vertical load, the steel plate layer 13 embedded between the rubber layers 14 will limit the lateral deformation of the rubber layer 14, thereby improving the vertical stiffness of the support. When the vehicle travels on the bridge 2 and transmits a vertical impact, the impact connector 16 slidingly connected inside the upper sealing steel plate 12 will move downward after being impacted. During the downward movement of the guide rod 18 fixedly connected to the lower part of the impact connector 16, the vertical micro displacement can be amplified by the micro-displacement amplifier 22, so that the piston 19 can obtain sufficient displacement in the oil chamber 17 to ensure that the damping energy consumption can be carried out. The piston 19 arranged inside the inner damping shell 23 divides the oil chamber 17 into two. During the reciprocating motion of the piston 19 in the oil chamber 17, the damping medium flows rapidly in the two separated chambers, and violent friction is generated between the molecules of the damping medium and between the damping medium and the piston 19. The damping medium generates huge throttling damping when passing through the damping hole 20 opened on the piston 19. The combined force of these actions becomes the damping force. The damping force generated in the flow converts the impact kinetic energy into heat dissipation through the reciprocating motion of the piston 19 in the damping medium, so that the movement speed of the piston 19 gradually decreases, thereby achieving the purpose of damping energy consumption, thereby effectively reducing the vibration impact on the bearing, and further increasing the overall service life of the bearing.

[0041] Matters not covered in the present invention are all known technologies.

[0042] The embodiments described above are merely descriptions of preferred implementation modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A seismic isolation plate type rubber bearing for a highway bridge, characterized by: The support includes a protective rubber sleeve, an embedded steel plate, a sealing steel plate and an anchor rod; the sealing steel plate is coaxially fixed to the upper and lower ends of the protective rubber sleeve respectively; the embedded steel plates are coaxially fixed to the outer surfaces of the sealing steel plates at both ends respectively; anchor rods are fixed above the four corners of the upper embedded steel plate and below the four corners of the lower embedded steel plate respectively; the upper embedded steel plate is fixed to the bottom of the bridge by the anchor rod, and the lower embedded steel plate is fixed to the top of the pier by the anchor rod; a plurality of steel plate layers are evenly distributed axially inside the protective rubber sleeve, and a rubber layer is arranged between two adjacent steel plate layers.

2. The highway bridge seismic isolation plate rubber bearing according to claim 1, characterized in that: A dustproof ring is arranged between the sealing layer steel plate and the end of the protective rubber sleeve.

3. The highway bridge seismic isolation plate rubber bearing according to claim 1, characterized in that: Anchor sleeves and anchor bolts are respectively arranged at the upper and lower ends of the connection between the anchor and the embedded steel plate; the anchor sleeves and anchor bolts are respectively located on the two side surfaces of the embedded steel plate and are both threadedly connected to the anchor.

4. The highway bridge seismic isolation plate type rubber bearing according to claim 1, characterized in that: An axial through hole is arranged at the axial center of the protective rubber sleeve, and a damping energy dissipation mechanism is arranged inside the axial through hole. The top end of the damping energy dissipation mechanism is correspondingly connected to the upper sealing layer steel plate in a sliding manner.

5. The highway bridge seismic isolation plate type rubber bearing according to claim 4, characterized in that: The damping energy dissipation mechanism comprises an outer damping shell, an inner damping shell, an impact connector, a sealing baffle I, a sealing baffle II, a guide rod, a piston and a sealing plate; the outer damping shell is coaxially fixed to the outer side of the lower area of ​​the inner damping shell; the outer damping shell and the inner damping shell are correspondingly coaxially fixed inside the axial through hole of the protective rubber sleeve; the guide rod is coaxially arranged inside the inner damping shell, and the upper and lower ends of the inner damping shell are respectively provided with sealing plates that slide with the guide rod; the top end of the guide rod passes through the sealing plate and is coaxially fixed to the bottom of the impact connector; the impact connector The joint is slidably connected with the upper sealing steel plate; the sealing baffle I, sealing baffle II and the piston are coaxially arranged on the outside of the part of the guide rod located in the inner damping shell from top to bottom; the outer rings of the sealing baffle I and sealing baffle II are fixedly connected with the inner wall of the inner damping shell, and the inner rings are slidably matched with the guide rod; the inner ring of the piston is fixedly connected with the guide rod, and the outer ring is slidably matched with the inner wall of the inner damping shell; an oil chamber is formed between the sealing baffle II and the lower sealing plate, and the piston divides the oil chamber into two; the end face of the piston is provided with axial damping holes evenly distributed around the circumference.

6. The highway bridge seismic isolation plate type rubber bearing according to claim 5, characterized in that: The oil chamber is filled with damping medium, which is separated on two sides by a piston, and the damping hole is used for the damping medium to pass through.

7. The highway bridge seismic isolation plate type rubber bearing according to claim 5, characterized in that: A micro-displacement amplifier is inserted into the upper part of the guide rod located in the inner damping shell.

8. The highway bridge seismic isolation plate type rubber bearing according to claim 1, characterized in that: The steel plate layer and the rubber layer are overlapped and bonded by pressure vulcanization.

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