Cellular sandwich fiber reinforced cement-based anti-ship collision device

Abstract

The application relates to a kind of cell sandwich fiber reinforced cement-based anti-ship collision devices, comprising a plurality of anti-collision facilities monomers arranged in the periphery of the bearing platform, each anti-collision facility monomer is fixed to the side of the bearing platform by connecting plate and bolt assembly, the top is opened and connected with the cast-in-situ concrete on the top of the bearing platform through steel bar and positioning column; all the outer sides of the anti-collision facility monomers are connected to form a whole structure through steel fender; the outer part of the anti-collision facility monomer is a steel structure, the inside of the steel structure is filled with BFFC composite material and a plurality of cell structures, which are separated by steel plates; the BFFC composite material is basalt fiber reinforced foam concrete, and each cell structure is made of sandwich material; the application has a multi-stage energy dissipation structure: coating buffer + BFFC impact resistance + cell stress dissipation to reduce peak ship collision force; the application has maintainability: segmented bolt connection allows local replacement, reducing maintenance cost; the application has durability: BFFC and coating are corrosion-resistant, which helps to prolong the service life of the anti-collision device.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of anti-collision safety, and particularly relates to a cell sandwich fiber reinforced cement-based anti-ship collision device which is suitable for ship collision protection of a bridge bearing across a channel. BACKGROUND

[0002] The bridge across a channel is a key project for a route to cross a channel, but the bridge across the channel will inevitably narrow the channel. With the rapid development of the transportation industry, the contradiction between the ship and the bridge across the channel is increasing day by day, and the bridge-ship collision accidents occur from time to time. After the bridge structure is impacted by the ship, the surface concrete of the bridge pier will be peeled off, the steel bars will be exposed, and even the bridge pier will be sheared and damaged, which seriously affects the bearing capacity of the bridge pier and causes the water-land traffic in the region to be blocked. Therefore, it is urgent to solve the contradiction between the bridge and the ship by a reasonable way. Dressing the bridge with a protective clothing, i.e. an anti-collision device, is a currently effective solution. The basic principle is to design based on the deformation energy dissipation and delay of the collision process, and classify according to the characteristics and application scope.

[0003] At present, the domestic mainstream anti-collision device is mainly divided into rigid anti-collision device and flexible anti-collision device. The basic principle is to absorb and disperse the impact energy by the buffering effect of the deformation of the device in the impact process, so as to reduce the direct action of the impact force on the bridge pier structure. When the rigid anti-collision device is impacted, it lacks an effective buffering mechanism, and the impact force will be directly transmitted to the protected structure and the impact object. And due to the high hardness of the rigid anti-collision device, fragments or splashes may be generated in the collision process, which may splash or fall into the water, causing secondary damage to the surrounding personnel or objects. Although the flexible anti-collision device can buffer the impact force to a certain extent, for a larger impact force, the flexible material may be excessively deformed or even fail, and it cannot completely prevent the damage of the impact to the protected structure. Its fundamental cannot effectively prolong the stress time, reduce the impact peak value, and reduce the damage of the collision to the protected object. Although this kind of device provides reliable protection capability in terms of collision energy absorption, there are still some limitations, such as high customized design and manufacturing cost, and the need for regular maintenance and repair to maintain performance. In addition, the production cycle of customization is long, which increases the time cost of the project. Therefore, a multi-stage energy dissipation and maintainable anti-collision device is urgently needed. SUMMARY

[0004] In order to overcome the problems of the rigid anti-collision device and the flexible anti-collision device, the application provides a cell sandwich fiber reinforced cement-based anti-ship collision device, which prolongs the impact time, reduces the peak force by multi-stage energy dissipation, and supports segmented maintenance.

[0005] To achieve the above purpose, the application provides the following technical scheme:

[0006] A kind of cell sandwich fiber reinforced cement-based anti-ship collision device, including being arranged in several anti-collision facilities monomer in the periphery of bearing platform, each anti-collision facilities monomer is fixed to the side of bearing platform by connecting plate and bolt assembly, top end aperture and is connected with bearing platform top cast-in-situ concrete by reinforcing bar and positioning column;All anti-collision facilities monomer outside is connected to form integral structure by steel fender;Anti-collision facilities monomer outside is steel structure, steel structure is filled with BFFC composite material and several cell structures, is separated by steel plate in the middle;BFFC composite material is basalt fiber reinforced foam concrete, each the cell structure is made of material sandwich.

[0007] Further, the BFFC composite material is distributed in the inside of the steel structure outside the anti-collision facility monomer and the bottom, wherein the volume fraction of basalt fiber in the basalt fiber reinforced foam concrete is about 0.30%-0.50%, and the fiber length is 9mm-15mm. The basalt fiber reinforced foam concrete with such a ratio can absorb a large amount of energy when it is destroyed, thereby improving the anti-impact performance of the anti-collision facility monomer. The BFFC composite material has excellent tensile peak stress, peak strain and compression energy absorption capacity.

[0008] Further, the cell structure is composed of two semicircular curved plates, four quarter-circular arc curved plates and two vertical plates. The two semicircular curved plates are oppositely placed and form a shape similar to the letter "O". The two vertical plates are placed outside the two semicircular curved plates, and on both sides of each vertical plate, there is a quarter-circular arc curved plate. The four curved plates are connected to the corresponding vertical plates on both sides and are tangent to the corresponding semicircular curved plates. The main function is to deform the anti-collision facility monomer under impact load to absorb a large amount of impact energy and reduce the ship collision force on the pier.

[0009] Further, the steel fender and the anti-collision facility monomer are detachably connected by bolts, so that the device can be repaired or replaced in sections.

[0010] The outer surface of the anti-collision facility monomer is coated with a composite material coating, and the composite material is a continuous fiber reinforced high-performance thermoplastic composite material. It has excellent properties of high cushioning, corrosion resistance and impact resistance.

[0011] Compared with the prior art, the technical scheme of the present application has the following advantages:

[0012] 1. The anti-ship collision device of the present application has a multi-stage energy dissipation structure, and the outer surface of the steel structure is coated with a composite material coating, which has the characteristics of high cushioning, corrosion resistance and impact resistance. The BFFC composite material sandwich structure in the middle layer improves the tensile and compressive properties of the anti-ship collision device. The cell structure inside the anti-collision facility is the main energy-consuming component inside the anti-collision facility, which can greatly reduce the peak value of the ship collision force.

[0013] 2、BFFC composite sandwich structure, the addition of basalt fiber can significantly improve the tensile peak stress and peak strain of the component. In the compression failure mode, it changes from longitudinal splitting failure and oblique shear failure to transverse crushing failure, significantly improving the energy absorption capacity of the specimen.

[0014] 3、The design of the cell structure significantly improves the local buckling resistance. The two semicircular curved plates in the cell structure form an O shape, which can effectively disperse the pressure when under compression. The concentrated pressure is evenly distributed to both sides, significantly reducing the local stress concentration phenomenon. When the device of the present application is subjected to external impact load, the two semicircular curved plates in the cell structure form an O shape, which can quickly direct the pressure to both sides, and the stress is transmitted through multiple paths by virtue of its geometric shape, avoiding excessive local stress. At the same time, the local stiffness of the device of the present application is increased, effectively preventing the cell structure from buckling locally when under compression, maintaining the integrity of the device of the present application. The two semicircular curved plates in the cell structure form an O shape and work cooperatively with other parts of the cell structure, enabling the entire device to more evenly distribute the load when under compression. This design ensures that the stress transmission between the inner and outer plates and the core layer of the cell structure is more uniform when subjected to impact, improving the overall load-carrying capacity. At the same time, the deformation capacity of the cell structure when under compression is increased, enabling it to absorb more impact energy. During the impact process, the cell structure will undergo elastic and plastic deformation, and this deformation process requires energy consumption, thereby reducing the impact force transmitted to the rear of the device of the present application, acting as a buffer protection, prolonging the impact time, and reducing the peak impact force of the ship.

[0015] 4、Maintainability: segmented bolt connection allows for partial replacement, reducing maintenance costs.

[0016] 5、Durability: BFFC and coating are corrosion-resistant, improving service life. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a plan view of the ship collision prevention device of the present application;

[0018] Figure 2 is a plan view of the ship collision prevention device of the present application;

[0019] Figure 3 is a single section view of the anti-collision facility of the present application;

[0020] Figure 4 is Figure 3 A_A cross-sectional view of

[0021] Figure 5 is Figure 3 B_B cross-sectional view of

[0022] Figure 6 From top to bottom, respectively, are cell structure deformation mode schematic diagrams.

[0023] Fig. 1, connecting plate; 2, anti-collision facility monomer; 3, steel fender; 4, bearing platform; 5, BFFC composite material; 6, cell structure. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application. The continuous fiber reinforced high-performance thermoplastic composite material coated on the outer surface of the steel structure of the anti-collision facility monomer can be directly purchased.

[0025] Referring to Figures 1-6 In the embodiment, the cell sandwich fiber reinforced cement-based anti-ship collision device comprises a plurality of anti-collision facility monomers 2 arranged on the periphery of the bearing platform 4. Each anti-collision facility monomer 2 is fixed to the side of the bearing platform 4 by a connecting plate 1 and a bolt assembly, and the top end is provided with a hole and connected to the top cast-in-place concrete of the bearing platform 4 by a steel bar and a positioning column. The outer sides of all the anti-collision facility monomers 2 are connected by steel fenders 3 to form a whole structure. The outer part of the anti-collision facility monomer 2 is a steel structure, the inside of which is filled with BFFC composite material 5 and a plurality of cell structures 6, which are separated by steel plates. The BFFC composite material 5 is basalt fiber reinforced foam concrete, and each cell structure 6 is made of sandwich material.

[0026] The BFFC composite material 5 is distributed inside the outer steel structure of the anti-collision facility monomer 2 and at the bottom. The volume fraction of basalt fiber in the basalt fiber reinforced foam concrete is 0.45%, and the fiber length is 12mm. The basalt fiber reinforced foam concrete with this ratio can absorb a large amount of energy when it is destroyed, thereby improving the anti-impact performance of the anti-collision facility monomer. The BFFC composite material has excellent tensile peak stress, peak strain and compression energy absorption capacity.

[0027] As Figure 4 shown, the cell structure is composed of two semicircular curved plates, four quarter-circular arc curved plates and two vertical plates. The two semicircular curved plates are placed opposite to each other and form a shape similar to the letter "O". The two vertical plates are placed outside the two semicircular curved plates, and on both sides of each vertical plate, there is a quarter-circular arc curved plate. The four curved plates are connected to the corresponding vertical plates on both sides and extend outward to be tangent to the corresponding semicircular curved plates. The main function is that the anti-collision facility monomer deforms to absorb a large amount of impact energy and reduce the ship collision force on the pier under impact load through the cell structure.

[0028] The steel fender 3 is detachably connected with the anti-collision device monomer 2 by bolts, so that the device is segmented for maintenance or replacement.

[0029] The outer surface of the anti-collision device monomer 2 is coated with a composite material coating, which is a continuous fiber reinforced high-performance thermoplastic composite material. It has excellent properties of high buffering, corrosion resistance and impact resistance.

[0030] As shown in Figure 3 , Figure 4 , Figure 5 The outer surface of the steel structure body of the anti-collision device monomer 2 is coated with a composite material coating, which has the characteristics of high buffering, corrosion resistance and impact resistance. The intermediate layer is a BFFC composite material sandwich structure, which improves the tensile and compressive properties of the anti-ship collision device. The cell structure is the main energy-consuming component inside the anti-collision device, which can greatly reduce the peak value of the ship collision force.

[0031] The basalt fiber in the BFFC composite material can significantly improve the tensile peak stress and peak strain of the component. The tensile peak stress and peak strain of the component increase with the increase of the fiber volume fraction, and increase first and then decrease with the increase of the fiber length. The compaction strain, platform stress, total energy absorption and specific energy absorption of each density specimen are significantly improved. The energy absorption capacity of the specimen increases with the increase of the fiber volume fraction, and increases first and then decreases with the increase of the fiber length. Foam concrete mainly relies on the collapse of pores for energy absorption, while BFFC composite material as a fiber composite material can absorb energy through multiple ways such as cracking and breaking of the base material, fiber fracture and fiber and base material friction. Within a certain range, the longer the fiber and the higher the volume fraction, the more energy absorbed by fiber fracture and friction, and the more stable the damage process, so the platform stress is higher and the energy absorption is more. The addition of basalt fiber will cause the number of small pores in the foam concrete to increase sharply, and the internal pore structure will be more uniform, reducing the probability of specimen failure caused by initial defects, thus making the failure process more stable. Therefore, the energy absorption performance of basalt fiber reinforced foam concrete is better than that of ordinary foam concrete.

[0032] The stiffness ratio of the vertical plate of the cell structure makes the whole cell structure have the characteristics of "stiff outside and soft inside", while ensuring high porosity, reducing the overall structure mass and providing space for deformation, significantly improving the unit mass energy absorption capacity of the anti-collision device and improving the impact resistance of the structure. The cell structure relies on its smooth curved surface to guide stress distribution under pressure, reduce local buckling phenomenon and exhibit the best impact resistance.

[0033] As shown in Figure 6The O-shaped deformation mode in the cellular structure under the action of impact load is mainly plastic large deformation, accompanied by the shear failure of the vertical plate. The middle part of the cellular structure exhibits an "X-shaped" collapse deformation mode during the impact process. In the initial stage of impact, the cellular structure deforms, the whole specimen is extruded and deformed to both sides, the middle interlayer starts to crush under continuous compression, the damaged vertical plate is X-shaped, the structure collapses to the center, the interlayer crushes to spread out parallel to both sides, the vertical plate on both sides breaks, and the bottom of the cellular structure remains intact. The structure realizes energy dissipation through plastic deformation and fracture.

[0034] The working principle of the above embodiment is as follows:

[0035] When the bridge is hit by a ship, the anti-collision facilities are extruded and deformed, and the steel fender is deformed to play a certain buffering and dispersion role. At the same time, the BFFC composite material deforms to consume part of the energy. Under the action of continuous impact force, the cellular structure deforms through its own structure, prolongs the impact time, reduces the peak value of the ship impact force, and achieves the purpose of buffering and energy dissipation.

[0036] Although the embodiments of the present application have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A cellular sandwich fiber reinforced cementitious based anti-ship impact device, characterized by: The utility model provides a kind of anti-collision facilities, including being arranged in the periphery of bearing platform (4) several anti-collision facilities monomer (2), each described anti-collision facilities monomer (2) is fixed in bearing platform (4) side portion by connecting plate (1) and bolt assembly, top end aperture and be connected with bearing platform (4) top cast-in-place concrete by reinforcing bar and positioning column;All anti-collision facilities monomer (2) outside is connected by steel fender (3) to form integral structure;Described anti-collision facilities monomer (2) outside is steel structure, steel structure interior fills BFFC composite material (5) and several cell structures (6), middle is separated by steel sheet, wherein BFFC composite material (5) is basalt fiber reinforced foam concrete, each described cell structure (6) is made of material sandwich to form; Described cell structure (6) is composed of two semicircular curved plates, four quarter circular arc curved plates and two vertical plates, two semicircular curved plates are placed oppositely, and form a shape similar to letter "O";Two vertical plates are placed outside two semicircular curved plates, and each quarter circular arc curved plate is placed on the side of vertical plate;Four curved plates are connected with corresponding vertical plate on two sides respectively and expand outward and connect with corresponding semicircular curved plate tangentially.

2. A cellular sandwich fiber reinforced cementitious-based anti-ship impact device according to claim 1, characterized in that: Described BFFC composite material (5) is distributed in the inside of steel structure outside anti-collision facilities monomer (2) and bottom, wherein the volume fraction of basalt fiber in basalt fiber reinforced foam concrete is 0.30%-0.50%, and the fiber length is 9mm-15mm.

3. A cellular sandwich fiber reinforced cementitious-based anti-ship impact device according to claim 1, characterized in that: Described steel fender (3) is detachably connected with anti-collision facilities monomer (2) by bolt.

4. A cellular sandwich fibre reinforced cementitious based anti-ship impact device according to claim 3, wherein: The outer surface of the steel structure of the anti-collision facilities monomer (2) is coated with a composite material coating, and the composite material is a continuous fiber reinforced high-performance thermoplastic composite material.

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