Combined multi-stage energy dissipation buffer device for bridge

Abstract

The invention discloses a bridge combined multi-stage energy consumption buffering device which comprises a steel jacket box, a steel partition plate for partitioning space is arranged in the steel jacket box, and a first-stage energy consumption structure for first-stage buffering energy consumption and a second-stage energy consumption structure for second-stage buffering energy consumption are arranged in the partitioned space. The steel jacket box is arranged outside the pier through the rubber fender. The UHPC panel and the stainless steel composite steel plate are adopted, and the service life of the structure is remarkably prolonged under the complex service environment of a water area. In the aspect of collision resistance, the system has a definite deformation mode induction mechanism, the collision force is dispersed through the UHPC panel with the large rigidity, the collision force is buffered through the honeycomb with the small rigidity, the collision force is transmitted to the high-strength steel grating structure through the UHPC and the dense honeycomb, the energy consumption efficiency is greatly improved, the force transmission path is reasonable, coverage of different anti-collision grades can be achieved, and the system is suitable for popularization and application. And meanwhile, the compression stroke of the energy dissipation assembly is increased, the peak impact force is reduced, and designability is good.

Description

Technical Field

[0001] The invention belongs to the technical field of infrastructure disaster prevention, and in particular relates to a bridge combined multi-stage energy dissipation buffer device. Background Art

[0002] At present, in the field of bridge pier collision protection, the most widely used anti-collision facilities include independent anti-collision facilities, fixed anti-collision facilities, and self-floating anti-collision facilities. Independent anti-collision facilities can be divided into pile groups, artificial cofferdams, etc. Their biggest feature is that the impact force of the ship does not directly act on the bridge pier, which can maximize the safety of the bridge pier. However, this anti-collision facility will cause great damage to the ship, and the construction cost of the anti-collision facility is high and it occupies the navigable waterway. Fixed and self-floating anti-collision facilities usually adopt similar structural composition schemes. The current mainstream includes two categories: steel structure and steel-clad composite material structure. Thanks to the plastic deformation capacity of the steel structure, it can effectively absorb the impact energy of the ship, prolong the impact sequence, and reduce the load borne by the bridge and the ship during the collision. However, the above-mentioned devices still expose many application defects during their current use. Among them, the steel structure is easily corroded by the aquatic environment, has a short service life and high maintenance cost; the external composite covering layer of the steel-clad composite material and the internal steel casing are bonded using a gluing process, which has low bonding strength and is prone to peeling during slight collisions, accelerating the corrosion of the internal steel box. In addition, the energy-charging and consuming components in the box are mostly grid structures, which can easily cause excessive local stress to puncture the hull in the event of a collision, exacerbating the consequences of a collision accident. Summary of the invention

[0003] The present invention is proposed to solve the problems existing in the prior art, and its purpose is to provide a bridge combined multi-stage energy dissipation buffer device.

[0004] The technical solution of the present invention is: a bridge combined multi-stage energy absorption and buffering device, including a steel casing, wherein a steel partition for dividing the space is arranged inside the steel casing, and a primary energy absorption structure for primary buffering and a secondary energy absorption structure for secondary buffering and energy absorption are respectively arranged in the divided space, and the steel casing is arranged outside the bridge pier through a rubber fender.

[0005] Furthermore, the primary energy dissipation structure includes a supporting grid, in which an aluminum honeycomb is arranged, and the supporting grid and the aluminum honeycomb form a honeycomb-grid energy dissipation structure.

[0006] Furthermore, the secondary energy dissipation structure includes a steel grille, and the steel grille is arranged between the inner wall of the steel casing and the steel partition.

[0007] Furthermore, the aluminum honeycomb is fixed to the support grid via an adhesive surface to prevent the two from disintegrating during a collision.

[0008] Furthermore, a UHPC layer is arranged outside the steel casing, and the UHPC layer includes a UHPC force-balancing layer and a UHPC supporting layer.

[0009] Furthermore, the UHPC force-balancing layer is arranged on a side of the steel casing away from the pier.

[0010] Furthermore, the UHPC supporting layer is arranged on a side of the steel casing facing the bridge pier.

[0011] Furthermore, a rubber fender is arranged outside the UHPC supporting layer, and the rubber fender is a plurality of firmly fixed ones.

[0012] Furthermore, the space of the primary energy dissipation structure is smaller than the space of the secondary energy dissipation structure.

[0013] The beneficial effects of the present invention are as follows: Since the present invention adopts UHPC panels, the service life of the structure is longer in complex water service environments and accidental situations such as scratches. In addition, since the exposed steel structure adopts stainless steel composite steel plates, the corrosion resistance is greatly enhanced, and the life of the device is significantly improved compared with the existing solutions.

[0014] In terms of collision resistance, the present invention has a clear deformation mode induction mechanism, which evenly distributes the impact force through UHPC panels with greater rigidity, buffers the impact force through honeycombs with lower rigidity, and transmits the impact force to the high-strength steel grid structure using UHPC and dense honeycombs. It can absorb large impact energy, has a reasonable force transmission path, and can achieve coverage of low, medium and high collision resistance levels. At the same time, it improves the compression stroke of energy-consuming components, reduces peak impact force, has good designability, and greatly improves the energy consumption efficiency of the anti-ship collision device.

[0015] The combination of the UHPC force-averaging layer, the primary energy-absorbing layer, and the secondary energy-absorbing layer adopted in the present invention has clear division of labor and a reasonable gradient force transmission path. The combined stiffness of the force-averaging layer and the primary energy-absorbing layer can ensure that the secondary energy-absorbing layer does not suffer local damage, thereby improving the energy absorption utilization rate of the traditional grid structure.

[0016] The process schemes of each energy-consuming component in the present invention are mature, the performance is stable and controllable, and the influence of the process on the performance of the device is minimized; The present invention adopts a modular design concept and can be composed of multiple units. It can be prefabricated in sections and then floated to the designated location and simply connected. The manufacturing and construction technology of the entire device is mature and the construction quality of each section can be guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is an exploded view of the present invention; Figure 2 It is a schematic diagram of the structure of the present invention; Figure 3It is the installation schematic diagram of the present invention; Figure 4 It is a schematic diagram of the structure of the rubber fender in the present invention; in: 1 UHPC layer 2 Steel casing 3 Aluminum honeycomb 4 Steel partition 5 Steel grating 6 Shear nails 7 Adhesive surface 8 Welding surface 9 Anti-collision structure 10 Bridge pier 11 Rubber fender 12 Pile foundation 111 Bolt hole 112 Base 113 High damping rubber. DETAILED DESCRIPTION

[0018] Hereinafter, the present invention will be described in detail with reference to the accompanying drawings and embodiments: like Figures 1 to 4 As shown, a combined multi-stage energy-absorbing and buffering device for a bridge comprises a steel casing 2, wherein a steel partition 4 for dividing a space is arranged inside the steel casing 2, wherein a primary energy-absorbing structure for primary buffering and a secondary energy-absorbing structure for secondary buffering are respectively arranged in the divided space, and the steel casing 2 is arranged outside the bridge pier 10 through a rubber fender 11.

[0019] The primary energy dissipation structure comprises a supporting grid, in which an aluminum honeycomb 3 is arranged, and the supporting grid and the aluminum honeycomb 3 form a honeycomb-grid energy dissipation structure.

[0020] The secondary energy dissipation structure includes a steel grille 5 , which is arranged between the inner wall of the steel casing 2 and the steel partition 4 .

[0021] The aluminum honeycomb 3 is fixed to the support grid via the adhesive surface 7 to prevent the two from disintegrating during a collision.

[0022] A UHPC layer 1 is disposed outside the steel casing 2, and the UHPC layer 1 includes a UHPC force-balancing layer and a UHPC supporting layer.

[0023] The UHPC force-balancing layer is arranged on a side of the steel casing 2 away from the pier 10 .

[0024] The UHPC supporting layer is arranged on a side of the steel casing 2 facing the pier 10 .

[0025] A rubber fender 11 is disposed outside the UHPC supporting layer, and a plurality of rubber fenders 11 are firmly fixed.

[0026] The space of the primary energy dissipation structure is smaller than the space of the secondary energy dissipation structure.

[0027] Specifically, the steel partition plate 4 is parallel to the UHPC layer 1 outside the steel casing 2 .

[0028] Specifically, the support grid in the primary energy dissipation structure and the steel grid 5 in the second energy dissipation structure are fixed to the steel partition plate 4 through the welding surface 8, and the two are respectively located on both sides of the steel partition plate 4.

[0029] Specifically, the rubber fender 11 is arranged outside the bridge pier 10 , and the bridge pier 10 is arranged on the pile foundation 12 .

[0030] Specifically, the rubber fender 11 includes a bolt hole 111 through which a bolt can pass, and the bolt hole 111 is arranged in a base 112 . A high damping rubber 113 is provided on the back of the base 112 , and the high damping rubber 113 faces the bridge pier 10 .

[0031] Specifically, Figure 1 As shown, the present invention consists of a UHPC force-balancing layer, a steel plate connecting layer, a primary energy-absorbing structure, a steel partition 4, a secondary energy-absorbing structure, a steel plate connecting layer, a UHPC supporting layer, and an elastic fender 11 from the impact side to the inner side.

[0032] Specifically, the outermost UHPC stress-isolating layer is mainly cast from high-performance fiber-reinforced concrete, which has high strength and toughness. During a collision, its stiffness is used to distribute the local impact force of the ship to the internal energy-consuming structure to avoid local damage to the structure. At the same time, the high wear resistance of the UHPC stress-isolating layer prevents the impact damage to the anti-collision structure caused by floating objects in the water and collisions with small boats.

[0033] Specifically, the steel casing 2 forms a whole with the UHPC force-distributing layer by designing a connecting piece, namely the shear nail 6. The inner tensile stress generated by the inward deformation near the impact point can be borne by the steel casing 2, so that the strength and toughness of the UHPC force-distributing layer are further improved, so as to transmit more impact force to the internal primary energy dissipation structure and the secondary energy dissipation structure.

[0034] Specifically, the primary energy dissipation structure is composed of an aluminum honeycomb 3 and a supporting grid structure of the required strength for the design. The aluminum honeycomb 3 and the supporting grid are connected by adhesive to avoid disintegration during collision and overcome the process difficulties of a single large-volume honeycomb. The aluminum honeycomb 3 achieves the effect of reducing the peak load through a certain pre-compression process.

[0035] Specifically, the steel partition plate 4 between the primary energy absorbing structure and the secondary energy absorbing structure is connected with the primary energy absorbing structure and the secondary energy absorbing structure by welding, so as to effectively transfer the load of the primary energy absorbing structure to the secondary energy absorbing structure.

[0036] Specifically, the secondary energy dissipation structure is welded by thin-walled Q235 steel plates, and the plate thickness and spacing are set according to the strength matching relationship between the primary energy dissipation structure and the secondary energy dissipation structure. The UHPC support layer is composed of an inner steel plate and a UHPC back plate, which are formed into a whole by connecting parts. At the same time, shear nails 6 are embedded in the UHPC back plate to connect the elastic polyurethane rubber fender 11 to the UHPC back plate.

[0037] As an implementation mode, except for the steel partition plate 4 and the energy dissipation structure, the rest of the outer steel structure is welded by composite steel plates.

[0038] Specifically, the construction method of the present invention comprises the following steps: First, the inner steel box of the prefabricated steel casing 2 is prefabricated into a groove-shaped structure with an upper opening, and connectors are prefabricated on the outer side of the steel box; Then, the first-level energy-absorbing structure and the second-level energy-absorbing structure that have been welded are placed inside the trough-shaped steel box. The energy-absorbing structure can provide internal support for the trough-shaped structure of the internal steel box. After completion, the trough-shaped top plate is welded, so that the internal steel box becomes a closed box chamber. Then, the ultra-high performance concrete is poured by using the temporarily fixed internal steel box and the preset steel plate (preset connector of the steel membrane on the inner support side) as the inner and outer molds; Finally, the rubber fender 11 is installed on the supporting side.

[0039] As an extended example, the grid of the secondary energy dissipation structure may be a cross grid structure. Similarly, the grid may also be a circular grid or a triangular grid of equal or better strength.

[0040] As an extended example, the primary energy dissipation structure may be a metal foam structure with high energy absorption efficiency and small peak impact force.

[0041] Since the present invention adopts UHPC panels, the service life of the structure is longer in complex water service environments and accidental situations such as scratches. In addition, since the exposed steel structure adopts stainless steel composite steel plates, the corrosion resistance is greatly enhanced, and the life of the device is significantly improved compared with the existing solutions.

[0042] In terms of collision resistance, the present invention has a clear deformation mode induction mechanism, which evenly distributes the impact force through UHPC panels with greater rigidity, buffers the impact force through honeycombs with lower rigidity, and transmits the impact force to the high-strength steel grid structure using UHPC and dense honeycombs. It can absorb large impact energy, has a reasonable force transmission path, and can achieve coverage of low, medium and high collision resistance levels. At the same time, it improves the compression stroke of energy-consuming components, reduces peak impact force, has good designability, and greatly improves the energy consumption efficiency of the anti-ship collision device.

[0043] The combination of the UHPC force-averaging layer, the primary energy-absorbing layer, and the secondary energy-absorbing layer adopted in the present invention has clear division of labor and a reasonable gradient force transmission path. The combined stiffness of the force-averaging layer and the primary energy-absorbing layer can ensure that the secondary energy-absorbing layer does not suffer local damage, thereby improving the energy absorption utilization rate of the traditional grid structure.

[0044] The process schemes of the energy-consuming components in the present invention are mature, the performance is stable and controllable, and the influence of the process on the performance of the device is reduced to the greatest extent.

[0045] The present invention adopts a modular design concept and can be composed of multiple units. It can be prefabricated in sections and then floated to the designated location and simply connected. The manufacturing and construction technology of the entire device is mature and the construction quality of each section can be guaranteed.

Claims

1. A bridge combined multi-stage energy dissipation buffer device, comprising a steel casing (2), characterized in that: A steel partition (4) for dividing the space is arranged inside the steel casing (2), and a primary energy dissipation structure for primary buffering and a secondary energy dissipation structure for secondary buffering are respectively arranged in the divided space. The steel casing (2) is arranged outside the bridge pier (10) via a rubber fender (11).

2. The bridge combined multi-stage energy dissipation buffer device according to claim 1 is characterized in that: The primary energy dissipation structure comprises a supporting grid, in which an aluminum honeycomb (3) is arranged, and the supporting grid and the aluminum honeycomb (3) form a honeycomb-grid energy dissipation structure.

3. The bridge combined multi-stage energy dissipation buffer device according to claim 1 is characterized in that: The secondary energy dissipation structure comprises a steel grille (5), and the steel grille (5) is arranged between the inner wall of the steel casing (2) and the steel partition plate (4).

4. The bridge combined multi-stage energy dissipation buffer device according to claim 2 is characterized in that: The aluminum honeycomb (3) is fixed to the support grid via the adhesive surface (7) to prevent the two from disintegrating during a collision.

5. The bridge combined multi-stage energy dissipation buffer device according to claim 1 is characterized in that: A UHPC layer (1) is arranged outside the steel casing (2), and the UHPC layer (1) comprises a UHPC force-balancing layer and a UHPC support layer.

6. The bridge combined multi-stage energy dissipation buffer device according to claim 5 is characterized in that: The UHPC force-balancing layer is arranged on a side of the steel casing (2) away from the bridge pier (10).

7. The bridge combined multi-stage energy dissipation buffer device according to claim 5 is characterized in that: The UHPC supporting layer is arranged on a side of the steel casing (2) facing the bridge pier (10).

8. The bridge combined multi-stage energy dissipation buffer device according to claim 7 is characterized in that: A rubber fender (11) is arranged outside the UHPC support layer, and the rubber fenders (11) are multiple and firmly fixed.

9. The bridge combined multi-stage energy dissipation buffer device according to claim 1 is characterized in that: The space of the primary energy dissipation structure is smaller than the space of the secondary energy dissipation structure.

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