A closed-cell foam aluminum sandwich ultra-high performance lightweight concrete highway guardrail

Abstract

A closed-cell aluminum foam sandwich ultra-high performance lightweight concrete highway guardrail belongs to the field of highway guardrail technology. This invention addresses the problems of poor durability, heavy weight, and low impact resistance of current concrete guardrails. It includes a guardrail base and several guardrail walls. The guardrail base is elongated and plate-shaped. The guardrail walls are detachably connected to the base, and the walls are sequentially interlocked along the length of the base. Each guardrail wall includes a closed-cell aluminum foam plate and a second lightweight concrete outer skin. The closed-cell aluminum foam plate is vertically positioned, and both sides of the plate are equipped with second steel mesh strips parallel to the plate. The second lightweight concrete outer skin encloses the closed-cell aluminum foam plate and the two steel mesh strips. This invention uses the second lightweight concrete outer skin to resist vehicle impacts, while the closed-cell aluminum foam plate absorbs impact energy through deformation. It possesses both the strength of a rigid guardrail and the buffering and energy absorption advantages of a flexible guardrail.

Description

Technical Field

[0001] This invention belongs to the field of highway guardrail technology, and particularly relates to a closed-cell foam aluminum sandwich ultra-high performance lightweight concrete highway guardrail. Background Technology

[0002] As a primary safety measure on highways, guardrails have received widespread attention in the highway construction industry. The main purpose of guardrails is to prevent out-of-control vehicles from crossing the median strip and colliding head-on with oncoming traffic, to prevent vehicles from veering off the highway and overturning, and to prevent wrecked vehicles from being bounced back into the same direction of traffic. Simultaneously, they allow out-of-control vehicles to decelerate at an acceptable speed, ensuring the safety of the vehicle and its occupants. Highway guardrails can be classified according to their rigidity into rigid guardrails, semi-rigid guardrails, and flexible guardrails, with rigid guardrails being concrete guardrails.

[0003] Currently, traditional concrete guardrails are quite thick, resulting in their heavy weight. Furthermore, concrete guardrails have poor impact resistance and deformation resistance, failing to protect occupants of vehicles. Additionally, in coastal areas with warm and humid climates, concrete guardrails are susceptible to corrosive damage from sea breezes, waves, and the humid environment. Therefore, developing a concrete crash barrier that is lightweight, durable, and highly impact-resistant is of significant practical importance. Summary of the Invention

[0004] The purpose of this invention is to provide a closed-cell aluminum foam sandwich ultra-high performance lightweight concrete highway guardrail to solve the problems of poor durability, heavy weight, and low impact resistance of current concrete guardrails. The technical solution adopted by this invention is as follows:

[0005] A closed-cell foam aluminum sandwich ultra-high performance lightweight concrete highway guardrail includes a guardrail base and several guardrail walls. The guardrail base is in the shape of a long strip plate, and the guardrail walls are detachably connected to the guardrail base. Several guardrail walls are sequentially inserted and fitted along the length of the guardrail base.

[0006] The guardrail foundation includes a first steel mesh and a first lightweight concrete outer skin. The first steel mesh is set horizontally, and the upper ends of several vertical steel bars are connected to the first steel mesh. The first lightweight concrete outer skin is poured inside the upper parts of several vertical steel bars and the first steel mesh, and the lower parts of several vertical steel bars are buried in the foundation.

[0007] The guardrail wall consists of a closed-cell aluminum foam board and a second lightweight concrete outer skin. The closed-cell aluminum foam board is set vertically, and a second steel mesh parallel to the closed-cell aluminum foam board is provided on both sides of the closed-cell aluminum foam board. The second lightweight concrete outer skin is cast inside the closed-cell aluminum foam board and the two second steel meshes.

[0008] Furthermore, several bolt guide grooves are pre-reserved on the upper surface of the guardrail foundation. These bolt guide grooves are arranged sequentially at intervals along the length of the guardrail foundation. Each bolt guide groove includes two inverted T-shaped grooves aligned along the width of the guardrail foundation. The inverted T-shaped grooves are set along the length of the guardrail foundation, and nut blocks are slidably disposed within them. The guardrail wall includes a connected base portion and an upper wall portion. The base portion is rectangular and horizontally positioned. The lower side of the upper wall portion is connected to the width centerline of the base portion. The base portion has several through holes, and these through holes correspond one-to-one with the inverted T-shaped grooves of the guardrail foundation. Several connecting bolts pass through these through holes and are connected one-to-one with the corresponding nut blocks.

[0009] Furthermore, the height of the guardrail base is less than 100mm.

[0010] Furthermore, the height of the base is 50mm to 100mm, and the height of the upper wall is greater than or equal to 50mm.

[0011] Furthermore, one end of the upper wall section is provided with a slot, and the other end of the upper wall section is provided with a strip. Adjacent guardrail walls are connected and fitted together through the slot and the strip.

[0012] Furthermore, the density of the first and second lightweight concrete outer skins is 1500 kg / m³. 3 ~1800kg / m 3 The 28-day standard cubic compressive strength of the first and second lightweight concrete outer skins is 100MPa to 140MPa.

[0013] Furthermore, the density of the closed-cell aluminum foam board is 100 kg / m³. 3 ~1000kg / m 3 .

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0015] 1. The guardrail foundation is poured on-site, and the guardrail wall is detachably connected to the foundation, allowing for factory prefabrication and on-site installation of the guardrail wall, significantly shortening the construction period. This invention uses a second lightweight concrete outer skin to resist vehicle impacts and external harmful substances, while closed-cell aluminum foam boards absorb impact energy during deformation. By combining lightweight concrete and closed-cell aluminum foam materials, it possesses both the strength of a rigid guardrail and the buffering and energy-absorbing advantages of a flexible guardrail.

[0016] 2. The first and second lightweight concrete outer skins are made of ultra-high performance lightweight concrete. Ultra-high performance lightweight concrete has the advantages of good durability and light weight, which can improve the durability of coastal guardrails and reduce operation and maintenance costs.

[0017] 3. The ultra-high performance lightweight concrete contains hollow microspheres, and the foamed aluminum material is loose and porous. Both of them have good sound absorption properties, which allows the present invention to absorb some of the car noise and reduce the impact on the surrounding environment. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the present invention;

[0019] Figure 2 This is a cross-sectional structural diagram of the guardrail foundation;

[0020] Figure 3 This is a cross-sectional structural diagram of the guardrail wall;

[0021] Figure 4 It is an isometric view of the guardrail wall.

[0022] In the diagram, 1. Guardrail foundation, 2. Guardrail wall, 3. Inverted T-shaped groove assembly, 4. First lightweight concrete outer skin, 5. Base section, 6. Upper wall section, 7. Nut block, 8. First steel mesh, 9. Vertical steel bar, 10. Closed-cell aluminum foam board, 11. Slot, 12. Through hole, 13. Clip strip, 14. Second lightweight concrete outer skin, 15. Second steel mesh. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this invention clearer, the invention is described below with reference to specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are merely exemplary and not intended to limit the scope of the invention. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of the invention.

[0024] The connections mentioned in this invention are divided into fixed connections and detachable connections. Fixed connections, also known as non-detachable connections, include but are not limited to conventional fixed connection methods such as folded connections, riveted connections, adhesive connections, and welded connections. Detachable connections include but are not limited to conventional disassembly methods such as bolted connections, snap-fit ​​connections, pin connections, and hinged connections. When a specific connection method is not explicitly defined, it is assumed that at least one existing connection method can be found to achieve this function, and those skilled in the art can choose according to their needs. For example, a welded connection can be chosen for fixed connections, and a bolted connection can be chosen for detachable connections.

[0025] The present invention will be further described in detail below with reference to the accompanying drawings. The following embodiments are explanations of the present invention, but the present invention is not limited to the following embodiments.

[0026] Example: Figures 1-4As shown, a closed-cell foam aluminum sandwich ultra-high performance lightweight concrete highway guardrail includes a guardrail base 1 and several guardrail walls 2. The guardrail base 1 is in the shape of a long strip plate. The guardrail walls 2 are detachably connected to the guardrail base 1. Several guardrail walls 2 are sequentially inserted and matched along the length direction of the guardrail base 1.

[0027] The guardrail foundation 1 includes a first steel mesh 8 and a first lightweight concrete outer skin 4. The first steel mesh 8 is set horizontally, and the upper ends of several vertical steel bars 9 are respectively connected to the first steel mesh 8. The first lightweight concrete outer skin 4 is poured inside the upper parts of several vertical steel bars 9 and the first steel mesh 8, and the lower parts of several vertical steel bars 9 are buried in the foundation.

[0028] The guardrail wall 2 includes a closed-cell aluminum foam board 10 and a second lightweight concrete outer skin 14. The closed-cell aluminum foam board 10 is set vertically, and a second steel mesh 15 parallel to the closed-cell aluminum foam board 10 is provided on both sides of the closed-cell aluminum foam board 10. The second lightweight concrete outer skin 14 is cast inside the closed-cell aluminum foam board 10 and the two second steel meshes 15.

[0029] The guardrail foundation 1 is poured on-site, and the guardrail wall 2 is detachably connected to the guardrail foundation 1, allowing the guardrail wall 2 to be prefabricated in the factory and installed on-site, which can greatly shorten the construction cycle. This invention uses a second lightweight concrete outer skin 14 to resist vehicle impacts and the erosion of harmful external substances, and closed-cell foam aluminum board 10 to absorb impact energy through deformation. By combining lightweight concrete and closed-cell foam aluminum materials, it possesses both the strength of a rigid guardrail and the buffering and energy absorption advantages of a flexible guardrail.

[0030] The first lightweight concrete outer skin 4 and the second lightweight concrete outer skin 14 are made of ultra-high performance lightweight concrete. Ultra-high performance lightweight concrete has the advantages of good durability and light weight, which can improve the durability of coastal guardrails and reduce operation and maintenance costs.

[0031] Because the closed-cell aluminum foam board 10 has low strength, it is inevitably subject to collisions during transportation, leading to deformation and affecting its appearance. Using a second lightweight concrete outer skin 14 to cover the closed-cell aluminum foam board 10 to withstand vehicle impacts can prevent damage to the board and facilitate the transport of the guardrail. Research has shown that placing the closed-cell aluminum foam board 10 in the central interlayer effectively dissipates impact energy, with a similar impact resistance to placing it directly on the outside of the guardrail.

[0032] The ultra-high performance lightweight concrete contains hollow microspheres, and the foamed aluminum material is loose and porous. Both of them have good sound absorption properties, which allows the present invention to absorb some of the car noise and reduce the impact on the surrounding environment.

[0033] UHPLC can achieve a fracture toughness of up to 40,000 J / m.2 It is 250 times stronger than ordinary concrete, and the fracture toughness of foamed aluminum is between 4,000,000 J / m. 2 ~20,000,000 J / m 2 Compared to ordinary guardrails of the same thickness, guardrails using closed-cell aluminum foam sheets 10 have more than 10 times better impact resistance.

[0034] This invention can be applied to scenic area facilities, including scenic boardwalks and railings, and can further reduce thickness and weight.

[0035] Several bolt guide groove groups 3 are pre-reserved on the upper surface of the guardrail foundation 1. The bolt guide groove groups 3 are arranged sequentially at intervals along the length direction of the guardrail foundation 1. Each bolt guide groove group 3 includes two inverted T-shaped grooves aligned along the width direction of the guardrail foundation 1. The inverted T-shaped grooves are set along the length direction of the guardrail foundation 1. Nut blocks 7 are slidably arranged in the inverted T-shaped grooves. The guardrail wall 2 includes a connected base part 5 and an upper wall part 6. The base part 5 is rectangular and horizontal. The lower side of the upper wall part 6 is connected to the width centerline of the base part 5. The base part 5 is provided with several through holes 12. The through holes 12 of the guardrail wall 2 correspond one-to-one with the inverted T-shaped grooves of the guardrail foundation 1. Several connecting bolts pass through the through holes 12 of the guardrail wall 2 and are connected one-to-one with the nut blocks 7. The width of the nut block 7 is greater than the opening width of the inverted T-shaped groove and less than the bottom width of the inverted T-shaped groove, but the thickness of the nut block 7 is less than the opening width of the inverted T-shaped groove. When the nut block 7 is inserted vertically into the inverted T-shaped groove and flipped flat, the nut block 7 cannot be removed from the inverted T-shaped groove and can slide along the length of the inverted T-shaped groove, which facilitates the assembly and connection with the guardrail wall 2.

[0036] The height of the guardrail foundation 1 is less than 100mm.

[0037] The height of the base part 5 is 50mm to 100mm, and the height of the upper wall part 6 is greater than or equal to 50mm.

[0038] One end of the upper wall section 6 is provided with a slot 11, and the other end of the upper wall section 6 is provided with a strip 13. Two adjacent guardrail walls 2 are connected and engaged through the slot 11 and the strip 13.

[0039] The density of the first lightweight concrete outer skin 4 and the second lightweight concrete outer skin 14 is 1500 kg / m³. 3 ~1800kg / m 3 The 28-day standard cubic compressive strength of the first lightweight concrete outer skin 4 and the second lightweight concrete outer skin 14 is 100MPa to 140MPa.

[0040] The density of closed-cell aluminum foam board 10 is 100 kg / m³. 3 ~1000kg / m3 Ultra-high performance lightweight concrete has an apparent density of less than 1950 kg / m³. 3 The compressive strength is not less than 100MPa, and the density of closed-cell aluminum foam is between 100kg / m3 and 1000kg / m3. Compared with ordinary concrete guardrails of the same thickness, ultra-high performance lightweight concrete guardrails with closed-cell aluminum foam board as the inner core can reduce their weight by more than 25%, thus achieving lightweight guardrails.

[0041] The above embodiments are merely illustrative examples of the present invention and do not limit its scope of protection. Those skilled in the art can make partial changes to them, as long as they do not exceed the spirit and essence of the present invention, they are all within the scope of protection of the present invention.

Claims

1. A closed-cell aluminum foam sandwich ultra-high performance lightweight concrete highway guardrail, characterized in that: It includes a guardrail base (1) and several guardrail walls (2). The guardrail base (1) is in the shape of a long strip. The guardrail walls (2) are detachably connected to the guardrail base (1). Several guardrail walls (2) are inserted and matched sequentially along the length of the guardrail base (1). The guardrail foundation (1) includes a first steel mesh (8) and a first lightweight concrete outer skin (4). The first steel mesh (8) is set horizontally, and the upper ends of several vertical steel bars (9) are connected to the first steel mesh (8). The first lightweight concrete outer skin (4) is poured inside the upper parts of several vertical steel bars (9) and the first steel mesh (8). The lower parts of several vertical steel bars (9) are buried in the foundation. The guardrail wall (2) includes a closed-cell foam aluminum board (10) and a second lightweight concrete outer skin (14). The closed-cell foam aluminum board (10) is set vertically, and a second steel mesh (15) parallel to the closed-cell foam aluminum board (10) is provided on both sides of the closed-cell foam aluminum board (10). The second lightweight concrete outer skin (14) is used to cast the closed-cell foam aluminum board (10) and the two second steel meshes (15) inside. Several bolt guide groove groups (3) are reserved on the upper surface of the guardrail foundation (1). Several bolt guide groove groups (3) are arranged in sequence at intervals along the length direction of the guardrail foundation (1). The bolt guide groove group (3) includes two inverted T-shaped grooves aligned along the width direction of the guardrail foundation (1). The inverted T-shaped grooves are set along the length direction of the guardrail foundation (1). Nut blocks (7) are slidably set in the inverted T-shaped grooves. The guardrail wall (2) includes a connected base part (5) and an upper wall part (6). The base part (5) is rectangular plate-shaped and horizontally set. The lower side of the upper wall part (6) is connected to the width center line of the base part (5). Several through holes (12) are provided on the base part (5). Several through holes (12) of several guardrail walls (2) correspond one-to-one with several inverted T-shaped grooves of the guardrail foundation (1). Several connecting bolts pass through several through holes (12) of several guardrail walls (2) and are connected one-to-one with several nut blocks (7).

2. The closed-cell aluminum foam sandwich ultra-high performance lightweight concrete highway guardrail according to claim 1, characterized in that: The height of the guardrail foundation (1) is less than 100mm.

3. The closed-cell aluminum foam sandwich ultra-high performance lightweight concrete highway guardrail according to claim 1, characterized in that: The height of the base part (5) is 50mm~100mm, and the height of the upper wall part (6) is greater than or equal to 50mm.

4. The closed-cell aluminum foam sandwich ultra-high performance lightweight concrete highway guardrail according to claim 1, characterized in that: One end of the upper wall section (6) is provided with a slot (11), and the other end of the upper wall section (6) is provided with a strip (13). Two adjacent guardrail walls (2) are connected by the slot (11) and the strip (13).

5. A closed-cell aluminum foam sandwich ultra-high performance lightweight concrete highway guardrail according to any one of claims 1-4, characterized in that: The density of the first lightweight concrete outer skin (4) and the second lightweight concrete outer skin (14) is 1500 kg / m³. 3 ~1800kg / m 3 The 28-day standard cubic compressive strength of the first lightweight concrete outer skin (4) and the second lightweight concrete outer skin (14) is 100MPa to 140MPa.

6. The closed-cell aluminum foam sandwich ultra-high performance lightweight concrete highway guardrail according to claim 5, characterized in that: The density of closed-cell aluminum foam board (10) is 100 kg / m³. 3 ~1000kg / m 3 .

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