Rubber shock absorption and isolation cushion block and connecting structure

Abstract

The invention provides a rubber shock absorption and isolation cushion block and a connecting structure, the rubber shock absorption and isolation cushion block and the basalt fiber base are connected through an extrusion type joint, and the basalt fiber base is fixed on an exposed surface of a main beam through four plastic expansion bolts; the extrusion type connector comprises a concave part arranged on the lower surface of the base body and an extrusion part which is arranged on the upper surface of the basalt fiber base and matched with the concave part in shape. In the rubber shock absorption and isolation cushion block and the connecting structure, the rubber shock absorption and isolation cushion block adopts the basalt fiber base, the durability of the basalt fiber material is better, and the durability of the product is improved. The rubber shock absorption and isolation cushion block and the basalt fiber base are connected in an extrusion type connector connection mode, operation is easy, later disassembly and replacement are convenient, and the use performance is not affected.

Description

Technical Field

[0001] This invention relates to a bridge seismic isolation structure, and more particularly to a rubber seismic isolation pad and its connection structure. Background Technology

[0002] Earthquakes have a significant impact on bridge structures. Every major earthquake causes some damage to bridges, and in some cases, bridges collapse, resulting in varying degrees of direct and indirect loss of life and property. Under the influence of an earthquake, the bridge structure undergoes longitudinal displacement, and the beam ends are prone to colliding with adjacent main beams at abutments or piers, causing damage or destruction to the beams and affecting the structural safety of the bridge.

[0003] Article 10.2.1 of the "Code for Seismic Design of Highway Bridges" (JTG / T 2231-01-2020) stipulates that seismic isolation devices should be replaceable and should be regularly maintained and inspected. Article 11.3.4 of the same code stipulates that rubber pads or other elastic linings should be installed between the beam and the abutment breast wall to mitigate impact and limit beam displacement.

[0004] The ends of the main beams in superstructures such as small box girders, T-beams, and cast-in-place continuous box girders are generally only 6 to 10 centimeters away from the adjacent main beams at the abutments or piers. Under earthquake action, the bridge undergoes significant displacement, making it prone to collisions with adjacent main beams at the abutments or piers, causing damage to the beam structure and affecting the safety of the bridge structure.

[0005] Early (10 years ago) rubber vibration damping pads were an integral unit with the base, fixed to the ends of the main beams of the superstructure using expansion bolts. However, the pads and bases were made of different materials, and improper handling could easily lead to detachment. Currently (in the last 3-5 years), the common practice is to embed the rubber vibration damping pads into a metal base from above, and then fix the base to the ends of the main beams (small box girders, T-beams, or cast-in-place continuous beams, etc.) of the superstructure using plastic expansion bolts. However, the base is made of metal and is prone to corrosion. The conventional approach is to place rubber vibration damping pads at the beam ends, with the pads inserted into the metal base from above or forming an integral unit with the metal base, thus achieving the function of vibration damping at the beam ends. However, conventional rubber vibration damping pads usually use metal bases, which are prone to corrosion when exposed to water seepage from the bridge deck, have a short lifespan, and affect the vibration damping effect. In addition, due to the limited space, the pads are not easy to replace, which does not conform to the concept of full life-cycle maintenance.

[0006] Early and current practices both aim to buffer the collision between the main beam and adjacent main beams at the abutment or connecting piers under seismic action, thereby protecting the beam structure.

[0007] The current approach has certain problems: 1. The main beam at the abutment or pier is located below the bridge deck expansion joint device, which is a place where water in the bridge deck is prone to leakage. After water in the bridge deck seeps in, the metal base will rust and age and fail.

[0008] 2. Because the space between the main beam end and the abutment or between the main beam of the connecting pier is generally narrow, usually only 6 to 10 centimeters, it makes replacement and disassembly difficult, which does not conform to the concept of being repairable and replaceable throughout the entire life cycle. Summary of the Invention

[0009] This invention provides a rubber vibration damping pad and its connecting structure, solving the technical problems of existing products being prone to aging, having a short service life, and being difficult to replace. The technical solution is as follows: A rubber vibration damping pad includes a protrusion and a base. The base is a cylinder with a protrusion on its upper surface and its lower surface connected to a basalt fiber base via an extrusion joint. The protrusion and the base are integrally formed.

[0010] The protrusion includes a central circular portion and multiple outer ring portions, each ring portion having a first ring, a second ring, a third ring, and a fourth ring with successively decreasing diameters.

[0011] The cross-sections of the circular and annular portions are barrel-shaped, with the middle portion protruding outwards, the upper surface being flat, and the lower portion contracting inwards.

[0012] The diameter of the circular portion, the width of the annular portion, and the distance between adjacent annular portions are all the same, ranging from 15mm to 30mm; the height of the protrusion and the base portion are the same, ranging from 10mm to 20mm.

[0013] A connection structure utilizing the aforementioned rubber vibration damping pad includes a rubber vibration damping pad and a basalt fiber base. The rubber vibration damping pad and the basalt fiber base are connected by an extrusion joint. The basalt fiber base is fixed to the exposed surface of the main beam by four plastic expansion bolts. The extrusion joint includes a recessed portion on the lower surface of the base and an extrusion portion with a matching shape on the upper surface of the basalt fiber base.

[0014] The extruded joint is surrounded by basalt fiber composite reinforcement material, which is FRP with a diameter of 2mm-5mm and the height of the basalt fiber composite reinforcement material from the upper surface of the matrix is ​​8mm-15mm.

[0015] The basalt fiber base includes a base part and an extrusion part. The height of the base part is 5mm-8mm, and the extrusion part is provided on the upper surface. The distance between the extrusion part and the upper surface of the base part is 5mm-8mm.

[0016] The base is rectangular in shape, with pre-drilled holes for plastic expansion bolts at the four corners, which are then fixed to the exposed surface of the main beam using expansion bolts.

[0017] The extrusion part consists of two rings, including an outer ring and an inner ring. The outer ring is directly below the second ring, and the inner ring is directly below the fourth ring. The width L of both the outer and inner rings is 15mm-30mm. The distance L1 between the outer ring and the base frame is 30mm-50mm, the distance L2 between the outer ring and the inner ring is 30mm-80mm, and the inner diameter of the inner ring is 30mm-80mm.

[0018] The rubber vibration damping pads are made of neoprene rubber or natural rubber, with an elastic modulus of 2 MPa to 4 MPa.

[0019] The present invention provides durable, low-carbon, environmentally friendly, and replaceable rubber vibration damping pads, enabling small components to play a significant role. The rubber vibration damping pads utilize a basalt fiber base, which offers superior durability, further enhancing the product's longevity. The connection between the rubber vibration damping pads and the basalt fiber base employs a compression joint, simplifying operation, facilitating disassembly and replacement, and preserving performance. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the connection structure of the rubber vibration damping pad; Figure 2 This is a plan view of the rubber vibration damping pad block; Figure 3 This is a planar schematic diagram of the basalt fiber base. Detailed Implementation

[0021] like Figure 1 As shown, the connection structure of the rubber vibration damping pad includes a rubber vibration damping pad 1 and a basalt fiber base 3. The rubber vibration damping pad 1 and the basalt fiber base 3 are connected by a compression joint. The basalt fiber base 3 is fixed to the exposed surface 10 of the main beam by four plastic expansion bolts.

[0022] Combination Figure 2 As shown, the rubber vibration damping pad 1 includes a protrusion 13 and a base 14. The base 14 is a cylinder with the protrusion 13 on its upper surface and its lower surface connected to the basalt fiber base 3 via an extrusion joint. The protrusion 13 includes a central circular portion 9 and multiple annular portions on its outer sides, with the annular portions having a first annular ring 5, a second annular ring 6, a third annular ring 7, and a fourth annular ring 8 whose diameters decrease sequentially. Furthermore, the protrusion 13 and the base 14 are integrally formed.

[0023] The circular portion 9 and the annular portion have barrel-shaped cross-sections, with the central portion 11 protruding outwards, the upper surface being a flat surface 12, and the lower part tapering inwards. The diameter of the circular portion 9 is 20mm, the width of the annular portion is 20mm, and the distance between adjacent annular portions is 20mm; the height of the rubber vibration damping pad 1 is 30mm, and the heights of the protrusion 13 and the base portion 14 are both 15mm.

[0024] The lower surface of the substrate 14 is provided with a recessed portion 15, and the upper surface of the basalt fiber base 3 is provided with a matching extrusion portion 16. The opening length of the recessed portion 15 is less than its internal length, and the upper end length of the extrusion portion 16 is greater than its bottom length. The recessed portion 15 and the extrusion portion 16 cooperate to form an extrusion joint. The rubber vibration damping pad 1 and the basalt fiber base 3 are formed as a whole through a factory prefabrication process, ensuring that the connection between the rubber vibration damping pad and the basalt fiber base is seamless, tight, and without any detachment.

[0025] The distance between the extrusion section 16 and the upper surface of the substrate 14 is 6 mm. Furthermore, a basalt fiber composite reinforcement material 2 is provided around the periphery of the extrusion joint. The basalt fiber composite reinforcement material 2 is made of FRP with a diameter of 3 mm, and the height of the basalt fiber composite reinforcement material 2 from the upper surface of the substrate 14 is 11 mm. Furthermore, the basalt fiber composite reinforcement material 2 is circular and is disposed within the rubber vibration damping pad 1.

[0026] This invention utilizes a combination of rubber vibration damping pads and basalt fiber bases to develop a connection structure that is easy to install and disassemble, facilitating later maintenance and replacement. The combination of new materials and traditional rubber produces a "synergistic effect." According to surveys with maintenance units, if such products are used, the total cost over the entire life cycle is expected to be reduced by more than 50%.

[0027] Combination Figure 3 As shown, the basalt fiber base 3 includes a base portion and an extrusion portion 16. The base portion has a height of 6mm, and the extrusion portion 16 is provided on the upper surface. The basalt fiber base 3 is rectangular in shape, with pre-drilled plastic expansion bolt holes 4 at the four corners, which are then fixed to the exposed surface 10 of the main beam by expansion bolts. Compared to the bases of current rubber vibration damping pads, which are generally made of metal, this invention uses a basalt fiber base. According to relevant research and applications, basalt fiber, due to its absence of metal materials, has good wear resistance and corrosion resistance, making it suitable for long-term use; basalt fiber raw materials are abundant, production is low-consumption and pollution-free, its performance is between that of glass fiber and carbon fiber, and its cost is lower than that of carbon fiber; the basalt fiber base material conforms to the concept of low carbon and environmental protection.

[0028] The extrusion part 16 consists of two rings, including an outer ring 17 and an inner ring 18. The width L of both the outer ring 17 and the inner ring 18 is 20 mm. The distance L1 between the outer ring 17 and the base frame is 40 mm, and the distance L2 between the outer ring 17 and the inner ring 18 is 60 mm. The inner diameter of the inner ring 18 is 60 mm.

[0029] The outer ring portion 17 is directly below the second ring 6, and the inner ring portion 18 is directly below the fourth ring 8.

[0030] For the application environment of rubber seismic isolation blocks 1, neoprene rubber is recommended for use on municipal bridges, while natural rubber is recommended for use on bridges in mountainous areas. The recommended longitudinal stiffness of the rubber seismic isolation blocks is 3000 KN / m to 6000 KN / m. The elastic modulus of the rubber seismic isolation blocks is 2 MPa to 4 MPa.

[0031] The basalt fiber base 3 is made of a material that meets the material performance requirements of the standard "Basalt Fiber Composite Materials for Civil Engineering Structures" (GB / T26745-2021). If replacement is needed later, the rubber vibration damping pads can be disassembled and installed manually at the bottom of the beam or using tools.

[0032] The present invention provides durable, low-carbon, environmentally friendly, and replaceable rubber vibration damping pads, enabling small components to play a significant role. The rubber vibration damping pads utilize a basalt fiber base, which offers superior durability, further enhancing the product's longevity. The connection between the rubber vibration damping pads and the basalt fiber base employs a compression joint, simplifying operation, facilitating disassembly and replacement, and preserving performance.

Claims

1. A rubber vibration damping pad, characterized in that: The rubber vibration damping pad includes a protrusion and a base. The base is a cylinder with a protrusion on its upper surface and its lower surface connected to a basalt fiber base via an extrusion joint. The protrusion and the base are integrally formed.

2. The rubber vibration damping pad according to claim 1, characterized in that: The protrusion includes a central circular portion and multiple outer ring portions, each ring portion having a first ring, a second ring, a third ring, and a fourth ring with successively decreasing diameters.

3. The rubber vibration damping pad according to claim 1, characterized in that: The cross-sections of the circular and annular portions are barrel-shaped, with the middle portion protruding outwards, the upper surface being flat, and the lower portion contracting inwards.

4. The rubber vibration damping pad according to claim 1, characterized in that: The diameter of the circular portion, the width of the annular portion, and the distance between adjacent annular portions are all the same, ranging from 15mm to 30mm; the height of the protrusion and the base portion are the same, ranging from 10mm to 20mm.

5. A connection structure utilizing the rubber vibration damping pad according to any one of claims 1-4, characterized in that: It includes rubber vibration damping pads and basalt fiber bases. The rubber vibration damping pads and basalt fiber bases are connected by extrusion joints. The basalt fiber bases are fixed to the exposed surface of the main beam by four plastic expansion bolts. The extrusion joints include a recessed part on the lower surface of the base and an extrusion part with a matching shape on the upper surface of the basalt fiber base.

6. The connection structure of the rubber vibration damping pad according to claim 5, characterized in that: The extruded joint is surrounded by basalt fiber composite reinforcement material, which is FRP with a diameter of 2mm-5mm and the height of the basalt fiber composite reinforcement material from the upper surface of the matrix is ​​8mm-15mm.

7. The connection structure of the rubber vibration damping pad according to claim 5, characterized in that: The basalt fiber base includes a base part and an extrusion part. The height of the base part is 5mm-8mm, and the extrusion part is provided on the upper surface. The distance between the extrusion part and the upper surface of the base part is 5mm-8mm.

8. The connection structure of the rubber vibration damping pad according to claim 7, characterized in that: The base is rectangular in shape, with pre-drilled holes for plastic expansion bolts at the four corners, which are then fixed to the exposed surface of the main beam using expansion bolts.

9. The connection structure of the rubber vibration damping pad according to claim 5, characterized in that: The extrusion part consists of two rings, including an outer ring and an inner ring. The outer ring is directly below the second ring, and the inner ring is directly below the fourth ring. The width L of both the outer and inner rings is 15mm-30mm. The distance L1 between the outer ring and the base frame is 30mm-50mm, the distance L2 between the outer ring and the inner ring is 30mm-80mm, and the inner diameter of the inner ring is 30mm-80mm.

10. The connection structure of the rubber vibration damping pad according to claim 5, characterized in that: The rubber vibration damping pads are made of neoprene rubber or natural rubber, with an elastic modulus of 2 MPa to 4 MPa.

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