Easily Replaceable Combined Energy Dissipation Device for Land Cross - line Bridge Piers against Vehicle Collision

Abstract

The present invention discloses an easily replaceable combined energy dissipation device for a land cross-line bridge pier against vehicle impact, which comprises a plurality of energy dissipation blocks. The horizontal cross-section of the energy dissipation block is a fan-shaped ring, and the plurality of energy dissipation blocks are spliced into an annular structure sleeved outside the land cross-line bridge pier to be protected. Wherein, each energy dissipation block includes a rubber concrete rigid impact-resistant layer and a foam aluminum energy dissipation layer arranged in sequence from the convex surface to the concave surface, and a soft steel plate covering the rubber concrete rigid impact-resistant layer and the foam aluminum energy dissipation layer to integrate the two layers. Connecting structures are arranged on both end faces of each energy dissipation block, so that adjacent two energy dissipation blocks can be detachably connected at the side end faces. The present invention can effectively reduce the damage of the bridge pier caused by vehicle impact, and can realize the replacement of the energy dissipation blocks, and the replacement is convenient, saving the investment in maintenance funds.

Description

Technical Field

[0001] The present invention relates to the field of bridge engineering. More specifically, the present invention relates to an easily replaceable combined energy dissipation device for a land-crossing bridge pier against vehicle impact. Background Art

[0002] As an important hub of the transportation network system, bridge engineering is of crucial significance to regional economic development and external exchanges. Given the influence of the engineering geology, hydrology, and climate conditions in the area where the bridge is located, as well as the differences in its traffic capacity and functional positioning, the disasters and sudden safety problems faced by the bridge are different. For land-crossing bridges, vehicles are allowed to pass under the bridge, posing a risk of vehicle impact on the bridge pier. As the main load-bearing structure of bridge engineering, under the action of vehicle impact load, the damage and failure of the bridge pier can seriously affect the traffic capacity and overall safety of the bridge, resulting in serious consequences. In order to reduce the damage to the bridge pier caused by the impact load and reduce the losses caused thereby, it is very necessary to install a bridge pier anti-collision device for land-crossing bridges. Summary of the Invention

[0003] The object of the present invention is to provide an easily replaceable combined energy dissipation device for a land-crossing bridge pier against vehicle impact, which can effectively reduce the damage to the bridge pier caused by vehicle impact.

[0004] To achieve these and other advantages in accordance with the present invention, there is provided an easily replaceable combined energy dissipation device for a land-crossing bridge pier against vehicle impact, including a plurality of energy dissipation blocks. The horizontal cross-section of each energy dissipation block is a fan-shaped ring, and a plurality of energy dissipation blocks are spliced into an annular structure sleeved outside the land-crossing bridge pier to be protected.

[0005] Wherein, each energy dissipation block includes a rubber-concrete rigid impact-resistant layer and a foam aluminum energy dissipation layer arranged in sequence from the convex surface to the concave surface, and a soft steel plate covering the rubber-concrete rigid impact-resistant layer and the foam aluminum energy dissipation layer to integrate the two layers.

[0006] Connecting structures are arranged on both end faces of each energy dissipation block to enable detachable connection between adjacent energy dissipation blocks at the side end faces.

[0007] Preferably, the rubber-concrete rigid impact-resistant layer includes a fiber composite honeycomb board, and rubber-concrete is poured into the fiber composite honeycomb board.

[0008] Preferably, the foam aluminum energy dissipation layer includes a base layer and a closed-cell foam aluminum plate. The base layer is closely attached to the fiber composite honeycomb board, and the closed-cell foam aluminum plate is closely attached to the base layer and the two are bonded by epoxy resin.

[0009] Preferably, carbon fiber composite cloths are attached to the convex surface of the rubber concrete rigid impact resistance layer and the concave surface of the aluminum foam energy dissipation layer. Slots opposite to the ends of the carbon fiber composite cloths are formed in the soft steel plates on both end faces of the energy dissipation blocks. After the carbon fiber composite cloth is pre-tensioned, its end extends out of the slot and is connected to a flat anchor plate, and the anchor plate abuts against the outer wall of the soft steel plate on the side end face of the energy dissipation block.

[0010] Preferably, criss-cross grooves are arranged on the convex surface of the aluminum foam energy dissipation layer, and convex blocks corresponding to the grooves are arranged on the concave surface of the rubber concrete rigid impact resistance layer, and the convex blocks are buckled in the grooves.

[0011] Preferably, the material of the base layer is a carbon fiber composite board.

[0012] Preferably, the connection structure on both end faces of the energy dissipation block includes a tenon head arranged on one end face of the energy dissipation block and a mortise groove arranged on the other end face. When multiple energy dissipation blocks are spliced, the tenon heads and mortise grooves on the opposite side end faces of adjacent two energy dissipation blocks cooperate with each other, and vertical through pin holes are arranged on the tenon heads and mortise grooves, and cylindrical lead cores are arranged in the pin holes so that adjacent two energy dissipation blocks can be detachably connected. A pin cap is arranged on the top of the lead core, and the diameter of the pin cap is larger than the aperture of the pin hole.

[0013] Preferably, a safety pin with a triangular cross-section is arranged in the center of the lead core.

[0014] Preferably, the tenon head is a semi-circular convex part, and the mortise groove is a semi-circular concave part matching the tenon head.

[0015] Preferably, a fan-shaped pier cap connecting plate is horizontally arranged at the lower end of the convex surface of each energy dissipation block, and bolt holes are formed in the fan-shaped pier cap connecting plate for connecting with the pier cap of the onshore overpass pier to be protected. The bolt holes are of a round-end type to adapt to the relative rotation of adjacent two energy dissipation blocks after multiple energy dissipation blocks are spliced.

[0016] The present invention has at least the following beneficial effects: The replaceable combined energy dissipation device of the present invention is designed separately from the onshore overpass pier and is installed around the pier during use. Therefore, it does not change the disaster resistance ability of other aspects of the bridge and can resist the damage of external impact force. In the above replaceable combined energy dissipation device, the rubber concrete rigid impact resistance layer can be used to resist the impact force of vehicles on the pier, and the aluminum foam energy dissipation layer is used to consume the vehicle collision energy and weaken the impact force transmitted inward. In addition, the connection method in which adjacent two energy dissipation blocks can rotate relative to each other and are detachable can adapt to the incoordination of impact force and deformation, and when some energy dissipation blocks are damaged, it is convenient to disassemble, install and replace, saving the investment in maintenance funds.

[0017] Other advantages, objects, and features of the present invention will be partially reflected in the following description and partially understood by those skilled in the art through the research and practice of the present invention. Description of the Drawings

[0018] Figure 1 It is a top - view structural schematic diagram of the easily replaceable combined energy - dissipation device described in the embodiment of the present invention;

[0019] Figure 2 It is a top - view of the easily replaceable combined energy - dissipation device described in the embodiment of the present invention when sleeved on a land - based over - line bridge pier;

[0020] Figure 3 It is a side - view of the easily replaceable combined energy - dissipation device described in the embodiment of the present invention when sleeved on a land - based over - line bridge pier;

[0021] Figure 4 It is a structural schematic diagram inside the energy - dissipation block described in an embodiment of the present invention;

[0022] Figure 5 It is a structural schematic diagram inside the energy - dissipation block described in another embodiment of the present invention. Detailed Embodiments

[0023] The following further elaborates on the present invention in conjunction with the drawings, so that those skilled in the art can implement it with reference to the description in the specification.

[0024] It should be noted that the experimental methods described in the following implementation plans are all conventional methods unless otherwise specified, and the reagents and materials can all be obtained from commercial channels unless otherwise specified; in the description of the present invention, the orientation or positional relationships indicated by the terms "lateral", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation to the present invention.

[0025] As Figures 1 to 5 shown, the present invention provides an easily replaceable combined energy - dissipation device for resisting vehicle impact on a land - based over - line bridge pier, including a plurality of energy - dissipation blocks 1. The horizontal cross - section of each energy - dissipation block 1 is a sector - ring shape, and a plurality of energy - dissipation blocks 1 are spliced into an annular structure sleeved outside the land - based over - line bridge pier 8 to be protected;

[0026] Among them, each energy - dissipation block 1 includes a rubber - concrete rigid impact - resistant layer 11 and an aluminum - foam energy - dissipation layer 12 arranged in sequence from the convex surface to the concave surface, and a soft steel plate 13 covering the rubber - concrete rigid impact - resistant layer 11 and the aluminum - foam energy - dissipation layer 12 to integrate the two layers;

[0027] Connecting structures are provided on both end faces of each energy dissipation block 1 so that two adjacent energy dissipation blocks 1 can be detachably connected at the side end faces.

[0028] In the above-mentioned embodiment, the easily replaceable combined energy dissipation device is designed separately from the land-crossing bridge pier 8 and is installed on the periphery of the pier during use. Therefore, it does not change the disaster prevention ability of other aspects of the bridge and can resist the damage of external impact forces. In the above-mentioned easily replaceable combined energy dissipation device, the rubber-concrete rigid impact resistance layer 11 can be used to resist the impact force of vehicles on the pier, and the aluminum foam energy dissipation layer 12 is used to consume the vehicle collision energy and weaken the impact force transmitted inward. In addition, the relatively rotatable and detachable connection method of two adjacent energy dissipation blocks 1 can adapt to the incoordination of impact force and deformation, and when some energy dissipation blocks 1 are damaged, it is convenient to disassemble, install and replace, saving the investment in maintenance funds.

[0029] In a preferred embodiment of the above-mentioned embodiment, the rubber-concrete rigid impact resistance layer 11 includes a fiber composite honeycomb panel 111, and rubber concrete is poured into the fiber composite honeycomb panel 111.

[0030] The fiber composite honeycomb panel 111 has the characteristics of light weight, high specific strength, high specific stiffness, heat insulation and shock absorption, and impact resistance.

[0031] Rubber concrete is a product obtained by mixing rubber emulsion, auxiliary admixtures and cement together when preparing cement mortar or concrete. It has good elastic-plasticity, resistance to heavy pressure, is not easy to wear, has good impact resistance and good durability.

[0032] In the above-mentioned embodiment, pouring rubber concrete into the fiber composite honeycomb panel 111 not only enhances the impact resistance effect of the fiber composite honeycomb panel 111, but also the elastic-plasticity of the rubber concrete retains part of the shock absorption and impact resistance performance of the fiber composite honeycomb panel 111, so that the rubber-concrete rigid impact resistance layer 11 can better withstand the impact of vehicles without being damaged, and at the same time can absorb part of the impact energy and convert it into elastic potential energy and then release it.

[0033] In a preferred embodiment of the above-mentioned embodiment, the aluminum foam energy dissipation layer 12 includes a base layer 121 and a closed-cell aluminum foam sheet 122. The base layer 121 is closely attached to the fiber composite honeycomb panel 111, and the closed-cell aluminum foam sheet 122 is closely attached to the base layer 121 and the two are bonded by epoxy resin.

[0034] Specifically, the base layer 121 can be made of a carbon fiber composite material plate.

[0035] Closed-cell aluminum foam has the characteristics of light weight, high damping and shock absorption performance, and high impact energy absorption performance. The density of closed-cell aluminum foam is 0.1-0.4 times that of aluminum, and its damping performance is 5-10 times that of metallic aluminum. When closed-cell aluminum foam has a porosity of 84%, it can undergo 50% deformation and absorb more than 2.5 MJ / m 3 of energy.

[0036] The thickness of the closed-cell aluminum foam plate 122 is generally designed to be 10-50 cm. Of course, the thickness of the closed-cell aluminum foam plate 122 can also be selected according to the actual collision force or impact ability requirements in the bridge site area.

[0037] In the above-mentioned embodiment, the base layer 121 of the carbon fiber composite material plate is combined with the closed-cell aluminum foam plate. Due to the fatigue resistance and damage safety of the carbon fiber composite material, the carbon fiber composite material plate is not easily damaged instantaneously or deformed strongly locally. Therefore, when being impacted, the carbon fiber composite material plate can evenly disperse the impact point force to the entire closed-cell aluminum foam plate, effectively preventing the local load of the foam aluminum energy dissipation layer 12 from exceeding and causing the energy dissipation block 1 to be strongly deformed and scrapped. This not only ensures the normal use of the energy dissipation block 1 but also extends its service life.

[0038] In a preferred embodiment of the above-mentioned embodiment, the convex surface of the foam aluminum energy dissipation layer 12 is provided with criss-cross grooves, and the concave surface of the rubber concrete rigid impact resistance layer 11 is provided with protrusions corresponding to the grooves, and the protrusions are buckled into the grooves.

[0039] In the above-mentioned embodiment, the soil blocks of the rubber concrete rigid impact resistance layer 11 in the energy dissipation block 1 are embedded into the grooves of the foam aluminum energy dissipation layer 12, making the rubber concrete rigid impact resistance layer 11 and the foam aluminum energy dissipation layer 12 closely combined, having a certain riveting effect, and not easily causing relative slip between the two during vehicle impact. In this way, the rubber concrete rigid impact resistance layer 11 can better transfer the impact energy to the foam aluminum energy dissipation layer 12 to achieve energy absorption and dissipation.

[0040] In a preferred embodiment of the above-mentioned embodiment, the connection structure at both end faces of the energy dissipation block 1 includes a tenon 2 provided on one end face of the energy dissipation block 1 and a mortise 3 provided on the other end face. When multiple energy dissipation blocks 1 are spliced, the tenons 2 and mortises 3 on the opposite side end faces of adjacent two energy dissipation blocks 1 cooperate with each other, and the tenons 2 and mortises 3 are provided with vertically penetrating pin holes, and a cylindrical lead core 4 is inserted into the pin holes to make adjacent two energy dissipation blocks 1 detachably connected. A pin cap is provided at the top of the lead core 4, and the diameter of the pin cap is larger than the aperture of the pin hole.

[0041] Specifically, a safety pin 14 with a triangular cross-section is provided at the center of the lead core 4.

[0042] Specifically, the tenon 2 is a semi-circular convex part, and the mortise 3 is a semi-circular concave part matching the tenon 2.

[0043] Here, a plurality of tenons 2 can be evenly spaced from top to bottom on one end face of the energy dissipation block 1, and a plurality of mortises 3 can also be evenly spaced from top to bottom on the other end face of the energy dissipation block 1. When a plurality of energy dissipation blocks 1 are spliced, the plurality of tenons 2 and the plurality of mortises 3 on the opposite side end faces of two adjacent energy dissipation blocks 1 just cooperate with each other.

[0044] In the above embodiment, the side end face of one of the two adjacent energy dissipation blocks 1 is designed as a tenon structure, and the side end face of the other energy dissipation block 1 opposite thereto is designed as a mortise structure. The mortise structure and the tenon structure are buckled with each other, and a vertically inserted lead core 4 forms a slightly rotatable connection structure, so that when one of the two adjacent energy dissipation blocks 1 is impacted, it can rotate and displace relative to the other, and transmit the motion change to other energy dissipation blocks 1, thereby adjusting the overall balance of the easily replaceable combined energy dissipation device. When the two adjacent energy dissipation blocks 1 have relative displacement, the lead core 4 can undergo circumferential shear and produce plastic deformation, so as to achieve the purpose of energy dissipation.

[0045] In another embodiment, carbon fiber composite cloth 5 is attached to the convex surface of the rubber concrete rigid impact resistance layer 11 and the concave surface of the aluminum foam energy dissipation layer 12. Slotted holes opposite to the ends of the carbon fiber composite cloth 5 are provided on the soft steel plates 13 on both side end faces of the energy dissipation block 1. After the carbon fiber composite cloth 5 is pre-tensioned, its end extends out of the slotted holes and is connected to a flat anchor plate 6, and the anchor plate 6 abuts against the outer wall of the soft steel plate 13 on the side end face of the energy dissipation block 1.

[0046] In the above embodiment, by arranging the pre-tensioned carbon fiber composite cloth 5 on the convex surface of the rubber concrete rigid impact resistance layer 11 and the concave surface of the aluminum foam energy dissipation layer 12, the carbon fiber composite cloth 5 can generate circumferential prestress on the convex surface of the rubber concrete rigid impact resistance layer 11 and the aluminum foam energy dissipation layer 12, so that when the energy dissipation block 1 bears an impact, it can completely or partially offset the tensile stress caused by the impact load, avoid structural damage, and effectively extend the service life of the energy dissipation block 1.

[0047] In another embodiment, a fan-shaped pier cap connecting plate 7 is horizontally arranged at the lower end of the convex surface of each energy dissipation block 1. Bolt holes are provided on the fan-shaped pier cap connecting plate 7 for connecting with the pier cap 9 of the land-crossing bridge pier 8 to be protected. The bolt holes are of a round-end type to adapt to the relative rotation of two adjacent energy dissipation blocks 1 after a plurality of energy dissipation blocks 1 are spliced.

[0048] Specifically, some bolt holes can be used to install shear keys on the lower plate surface of the pier cap connection plate 7, while the remaining bolt holes can be used to install chemical bolts, enabling the energy dissipation blocks 1 to be connected to the pier cap 9 of the land-crossing bridge pier 8 through the shear keys and chemical bolts. The diameter and quantity of the bolts in the shear key pair are determined through calculation, but the bolt holes should be made into round-ended types to accommodate the rotation between the energy dissipation blocks 1.

[0049] Although the embodiments of the present invention have been disclosed as above, they are not limited to only the applications listed in the specification and the embodiments. It can be fully applied to various fields suitable for the present invention. For those familiar with the field, additional modifications can be easily achieved. Therefore, without departing from the general concept defined by the claims and the equivalent scope, the present invention is not limited to specific details and the illustrated examples here.

Claims

1. An easily replaceable combined energy dissipation device for a land cross-line bridge pier against vehicle impact, characterized in that, it includes a plurality of energy dissipation blocks. The horizontal cross-section of the energy dissipation block is a sector ring shape, and a plurality of energy dissipation blocks are spliced into an annular structure sleeved outside the land cross-line bridge pier to be protected; wherein, each energy dissipation block includes a rubber-concrete rigid impact-resistant layer and a foam aluminum energy dissipation layer arranged in sequence from the convex surface to the concave surface, and a soft steel plate covering the rubber-concrete rigid impact-resistant layer and the foam aluminum energy dissipation layer to integrate the two layers; connection structures are arranged on both end faces of each energy dissipation block to detachably connect adjacent two energy dissipation blocks at the side end faces; the rubber-concrete rigid impact-resistant layer includes a fiber composite honeycomb panel, and rubber-concrete is poured into the fiber composite honeycomb panel; the foam aluminum energy dissipation layer includes a base layer and a closed-cell foam aluminum plate. The base layer is closely attached to the fiber composite honeycomb panel, and the closed-cell foam aluminum plate is closely attached to the base layer and the two are bonded by epoxy resin; the connection structures on both end faces of the energy dissipation block include a tenon head arranged on one end face of the energy dissipation block and a mortise groove arranged on the other end face. When a plurality of energy dissipation blocks are spliced, the tenon heads and mortise grooves on the opposite side end faces of adjacent two energy dissipation blocks cooperate with each other, and vertical through pin holes are arranged on the tenon heads and mortise grooves. A cylindrical lead core is inserted into the pin holes to detachably connect adjacent two energy dissipation blocks. A pin cap is arranged at the top of the lead core, and the diameter of the pin cap is larger than the aperture of the pin hole; carbon fiber composite cloths are pasted on both the convex surface of the rubber-concrete rigid impact-resistant layer and the concave surface of the foam aluminum energy dissipation layer. Slits opposite to the ends of the carbon fiber composite cloths are arranged on the soft steel plates on both end faces of the energy dissipation block. After the carbon fiber composite cloth is pre-tensioned, its end extends out of the slit and is connected to a flat anchor plate, and the anchor plate abuts against the outer wall of the soft steel plate on the side end face of the energy dissipation block.

2. The easily replaceable combined energy dissipation device for a land cross-line bridge pier against vehicle impact according to claim 1, characterized in that, grooves are arranged in a criss-cross pattern on the convex surface of the foam aluminum energy dissipation layer, and convex blocks corresponding to the grooves are arranged on the concave surface of the rubber-concrete rigid impact-resistant layer, and the convex blocks are buckled into the grooves.

3. The easily replaceable combined energy dissipation device for a land cross-line bridge pier against vehicle impact according to claim 1, characterized in that, the material of the base layer is a carbon fiber composite board.

4. The easily replaceable combined energy dissipation device for a land cross-line bridge pier against vehicle impact according to claim 1, characterized in that, a safety pin with a triangular cross-section is arranged at the center of the lead core.

5. The easily replaceable combined energy dissipation device for a land cross-line bridge pier against vehicle impact according to claim 1, characterized in that, the tenon head is a semi-circular convex part, and the mortise groove is a semi-circular concave part matching the tenon head.

6. The easily replaceable combined energy dissipation device for a land cross-line bridge pier against vehicle impact according to claim 1, characterized in that, A fan-shaped ring pier cap connecting plate is horizontally arranged at the lower end of the convex surface of each energy dissipation block. Bolt holes are formed in the pier cap connecting plate for connecting with the pier cap of the onshore overline bridge pier to be protected. The bolt holes are of a round-end type to adapt to the relative rotation of two adjacent energy dissipation blocks after multiple energy dissipation blocks are spliced.

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