Closed-cell foamed aluminum sandwich ultra-high-performance lightweight concrete road guardrail

Abstract

The invention discloses a closed-cell foamed aluminum sandwich ultra-high-performance lightweight concrete road guardrail, belongs to the technical field of road guardrails, and aims to solve the problems of poor durability, large dead weight and low anti-collision deformation capability of a current concrete guardrail. Comprising a guardrail foundation and a plurality of guardrail walls, the guardrail foundation is in a long-strip plate shape, the guardrail walls are detachably connected with the guardrail foundation, and the guardrail walls are sequentially matched in an inserted mode in the length direction of the guardrail foundation; the guardrail wall body comprises a closed-cell foamed aluminum plate and a second lightweight concrete skin, the closed-cell foamed aluminum plate is vertically arranged, second reinforcing meshes parallel to the closed-cell foamed aluminum plate are arranged on the two sides of the closed-cell foamed aluminum plate, and the closed-cell foamed aluminum plate and the two second reinforcing meshes are poured into the second lightweight concrete skin. Vehicle impact is resisted through the second lightweight concrete skin, the closed-cell foamed aluminum plate is used for deforming and absorbing impact energy, the strength of a rigid guardrail is achieved, and the advantages of buffering and energy absorption of a flexible guardrail are achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of highway guardrails, and in particular relates to a closed-cell foam aluminum sandwich ultra-high performance lightweight concrete highway guardrail. Background Art

[0002] Guardrails are the main safety measures on highways and are widely valued by the highway construction industry. The main purpose of guardrails is to prevent out-of-control vehicles from rushing through the central strip of the highway and colliding head-on with oncoming vehicles, to prevent vehicles from running out of the highway and causing rollover accidents, and to prevent accident vehicles from being bounced back into the same direction of traffic flow. At the same time, out-of-control vehicles can be decelerated at an acceptable deceleration rate to ensure the personal safety of accident vehicles and their passengers. Highway guardrails can be divided into rigid guardrails, semi-rigid guardrails and flexible guardrails according to their hardness, among which rigid guardrails are concrete guardrails.

[0003] At present, the thickness of traditional concrete guardrails is relatively large, resulting in their heavy weight. At the same time, the anti-collision deformation performance of concrete guardrails is poor, and they cannot protect the occupants of the vehicle. In addition, for coastal areas, the climate is warm and humid. Affected by sea breeze, waves and humid climate, concrete guardrails are prone to erosion damage. Therefore, it is of great practical significance to propose a concrete anti-collision guardrail with low dead weight, good durability and strong impact resistance. Summary of the invention

[0004] The purpose of the present invention is to provide a closed-cell foam aluminum sandwich ultra-high performance lightweight concrete highway guardrail to solve the problems of poor durability, heavy weight, and low anti-collision deformation ability of current concrete guardrails. The technical solutions adopted by the present invention are as follows:

[0005] A closed-cell aluminum foam sandwich ultra-high performance lightweight concrete highway guardrail, comprising a guardrail foundation and a plurality of guardrail walls, wherein the guardrail foundation is in the shape of a long strip, the guardrail wall and the guardrail foundation are detachably connected, and the plurality of guardrail walls are plugged in and matched in sequence along the length direction of the guardrail foundation;

[0006] The guardrail foundation includes a first steel mesh and a first lightweight concrete outer skin, the first steel mesh is arranged horizontally, the upper ends of a plurality of vertical steel bars are respectively connected to the first steel mesh, the first lightweight concrete outer skin casts the upper parts of the plurality of vertical steel bars and the first steel mesh, and the lower parts of the plurality of vertical steel bars are buried in the foundation;

[0007] The guardrail wall includes a closed-cell foam aluminum plate and a second lightweight concrete outer skin. The closed-cell foam aluminum plate is arranged vertically. Second steel meshes parallel to the closed-cell foam aluminum plate are arranged on both sides of the closed-cell foam aluminum plate. The second lightweight concrete outer skin casts the closed-cell foam aluminum plate and the two second steel meshes inside.

[0008] Furthermore, a plurality of bolt guide groove groups are reserved on the upper end surface of the guardrail foundation, and the plurality of bolt guide groove groups are arranged in sequence along the length direction of the guardrail foundation. The bolt guide groove groups include two inverted T-shaped grooves aligned along the width direction of the guardrail foundation, and the inverted T-shaped grooves are arranged along the length direction of the guardrail foundation. Nut blocks are slidably arranged in the inverted T-shaped grooves. The guardrail wall includes a connected base portion and an upper wall portion. The base portion is in the shape of a rectangular plate, and the base portion is horizontally arranged. The lower side of the upper wall portion is connected to the width midline of the base portion. A plurality of through holes are provided on the base portion, and the through holes of the plurality of guardrail walls correspond one-to-one to the plurality of inverted T-shaped grooves of the guardrail foundation. A plurality of connecting bolts pass through the through holes of the plurality of guardrail walls one-to-one and are connected to the plurality of nut blocks one-to-one.

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

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

[0011] Furthermore, a card slot is provided at one end of the upper wall portion, and a card strip is provided at the other end of the upper wall portion, and two adjacent guardrail walls are plugged in and matched with each other through the card slot and the card strip.

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

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

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. The guardrail foundation is cast on site, and the guardrail wall is detachably connected to the guardrail foundation, so that the guardrail wall can be prefabricated in the factory and installed on site, which can greatly shorten the construction period. The present invention uses the second lightweight concrete outer skin to resist vehicle impact and erosion by external harmful substances, and the closed-cell foam aluminum plate is used to deform and absorb impact energy. The lightweight concrete material and the closed-cell foam aluminum material are combined, which has both the strength of a rigid guardrail and the advantages of buffering and energy absorption of a flexible guardrail.

[0016] 2. The first lightweight concrete skin and the second lightweight concrete skin are cast with 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 guardrails in coastal areas and reduce operation and maintenance costs.

[0017] 3. The ultra-high performance lightweight concrete is mixed with hollow microspheres, and the foamed aluminum material is loose and porous, both of which have good sound absorption performance, so that the present invention can absorb part of the automobile noise and reduce the impact on the surrounding environment. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0019] Figure 2 It is a schematic diagram of the cutaway structure of the guardrail foundation;

[0020] Figure 3 It is a schematic diagram of the cutaway structure of the guardrail wall;

[0021] Figure 4 It is an axonometric drawing of the guardrail wall.

[0022] In the figure, 1. guardrail foundation, 2. guardrail wall, 3. inverted T-shaped groove group, 4. first lightweight concrete skin, 5. base part, 6. upper wall part, 7. nut block, 8. first steel mesh, 9. vertical steel bars, 10. closed-cell foam aluminum plate, 11. slot, 12. through hole, 13. clip, 14. second lightweight concrete skin, 15. second steel mesh. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is described below by the specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0024] The connection mentioned in the present invention is divided into fixed connection and detachable connection. The fixed connection is a non-detachable connection including but not limited to conventional fixed connection methods such as folding connection, rivet connection, bonding connection and welding connection. The detachable connection includes but not limited to conventional detachable methods such as bolt connection, snap connection, pin connection and hinge connection. When the specific connection method is not clearly defined, it is assumed that at least one connection method can be found in the existing connection methods to achieve the function, and those skilled in the art can choose according to their needs. For example: welding connection is selected for fixed connection, and bolt connection is selected for detachable connection.

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

[0026] Example: Figure 1 to Figure 4As shown, a closed-cell aluminum foam sandwich ultra-high performance lightweight concrete highway guardrail comprises a guardrail foundation 1 and a plurality of guardrail walls 2, wherein the guardrail foundation 1 is in the shape of a long strip, the guardrail wall 2 is detachably connected to the guardrail foundation 1, and the plurality of guardrail walls 2 are plugged in and matched in sequence along the length direction of the guardrail foundation 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 arranged horizontally, the upper ends of a plurality of vertical steel bars 9 are respectively connected to the first steel mesh 8, the first lightweight concrete outer skin 4 casts the upper parts of the plurality of vertical steel bars 9 and the first steel mesh 8, and the lower parts of the plurality of vertical steel bars 9 are buried in the foundation;

[0028] The guardrail wall 2 includes a closed-cell foam aluminum plate 10 and a second lightweight concrete outer skin 14. The closed-cell foam aluminum plate 10 is vertically arranged. Second steel meshes 15 parallel to the closed-cell foam aluminum plate 10 are arranged on both sides of the closed-cell foam aluminum plate 10. The second lightweight concrete outer skin 14 casts the closed-cell foam aluminum plate 10 and the two second steel meshes 15 inside.

[0029] The guardrail foundation 1 is cast on site, and the guardrail wall 2 is detachably connected to the guardrail foundation 1, so that the guardrail wall 2 can be prefabricated in the factory and installed on site, which can greatly shorten the construction period. The present invention uses the second lightweight concrete outer skin 14 to resist vehicle impact and erosion by external harmful substances, and the closed-cell foam aluminum plate 10 is used to deform and absorb impact energy. The lightweight concrete material and the closed-cell foam aluminum material are combined, which has both the strength of a rigid guardrail and the buffering and energy absorption advantages of a flexible guardrail.

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

[0031] Since the closed-cell aluminum foam plate 10 has a low strength, collisions are inevitable during transportation, resulting in deformation and affecting the appearance. The closed-cell aluminum foam plate 10 is covered with the second lightweight concrete outer skin 14 to withstand the impact of vehicles, which can avoid damage to the closed-cell aluminum foam plate 10 and facilitate the transportation of the guardrail. After research, it was found that placing the closed-cell aluminum foam plate 10 in the central interlayer position plays a role in dissipating impact energy, and the impact resistance is not much different from placing the closed-cell aluminum foam plate 10 directly on the outside of the guardrail.

[0032] The ultra-high performance lightweight concrete is mixed with hollow microspheres, and the foamed aluminum material is loose and porous, both of which have good sound absorption performance, so that the present invention can absorb part of the automobile noise and reduce the impact on the surrounding environment.

[0033] The fracture toughness of UHPLC can reach 40000J / m2 , which is 250 times that of ordinary concrete. The fracture toughness of foamed aluminum is between 4000000J / m 2 ~20000000J / m 2 Compared with ordinary guardrails of the same thickness, the impact resistance of the guardrail using the closed-cell aluminum foam plate 10 can be improved by more than 10 times.

[0034] The present invention can be applied to scenic area facilities, including scenic area plank roads and guardrails, etc., and can further reduce the thickness and the deadweight.

[0035] A plurality of bolt guide groove groups 3 are reserved on the upper end surface of the guardrail foundation 1, and the plurality of bolt guide groove groups 3 are arranged in sequence 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, and the inverted T-shaped grooves are arranged 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 portion 5 and an upper wall portion 6. The base portion 5 is in the shape of a rectangular plate, and the base portion 5 is horizontally arranged. The lower side of the upper wall portion 6 is connected to the width midline of the base portion 5. A plurality of through holes 12 are provided on the base portion 5. The through holes 12 of the plurality of guardrail walls 2 correspond one-to-one to the plurality of inverted T-shaped grooves of the guardrail foundation 1, and a plurality of connecting bolts pass through the through holes 12 of the plurality of guardrail walls 2 one-to-one and are connected to the plurality of nut blocks 7 one-to-one. The width of the nut block 7 is greater than the slot width of the inverted T-shaped slot and smaller than the slot bottom width of the inverted T-shaped slot, but the thickness of the nut block 7 is smaller than the slot width of the inverted T-shaped slot. The nut block 7 is inserted upright into the inverted T-shaped slot and turned over and laid flat. The nut block 7 cannot be separated from the inverted T-shaped slot and can slide along the length direction of the inverted T-shaped slot, which is convenient for assembly and connection with the guardrail wall 2.

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

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

[0038] A clamping groove 11 is provided at one end of the upper wall portion 6 , and a clamping strip 13 is provided at the other end of the upper wall portion 6 . Two adjacent guardrail walls 2 are plugged together through the clamping groove 11 and the clamping strip 13 .

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

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

[0041] The above embodiments are merely exemplary descriptions of the present invention and do not limit its protection scope. Those skilled in the art may also make partial changes thereto, which are within the protection scope of the present invention as long as they do not exceed the spirit of the present invention.

Claims

1. A closed-cell aluminum foam sandwich ultra-high performance lightweight concrete highway guardrail, characterized by: It comprises a guardrail foundation (1) and a plurality of guardrail walls (2), wherein the guardrail foundation (1) is in the shape of a long strip, the guardrail wall (2) is detachably connected to the guardrail foundation (1), and the plurality of guardrail walls (2) are plugged in and matched in sequence along the length direction of the guardrail foundation (1); The guardrail foundation (1) comprises a first steel mesh (8) and a first lightweight concrete outer skin (4), wherein the first steel mesh (8) is arranged horizontally, the upper ends of a plurality of vertical steel bars (9) are respectively connected to the first steel mesh (8), the first lightweight concrete outer skin (4) casts the upper parts of the plurality of vertical steel bars (9) and the first steel mesh (8) inside, and the lower parts of the plurality of vertical steel bars (9) are all buried in the foundation; The guardrail wall (2) comprises a closed-cell aluminum foam plate (10) and a second lightweight concrete outer skin (14); the closed-cell aluminum foam plate (10) is arranged vertically; second steel mesh sheets (15) parallel to the closed-cell aluminum foam plate (10) are arranged on both sides of the closed-cell aluminum foam plate (10); and the second lightweight concrete outer skin (14) casts the closed-cell aluminum foam plate (10) and the two second steel mesh sheets (15) inside.

2. According to claim 1, a closed-cell foam aluminum sandwich ultra-high performance lightweight concrete highway guardrail is characterized by: A plurality of bolt guide groove groups (3) are reserved on the upper end surface of the guardrail foundation (1), and the plurality of bolt guide groove groups (3) are sequentially spaced along the length direction of the guardrail foundation (1). The bolt guide groove groups (3) include two inverted T-shaped grooves aligned along the width direction of the guardrail foundation (1), and the inverted T-shaped grooves are arranged 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 base portion (5) and an upper wall portion connected to each other. (6), the base portion (5) is in the shape of a rectangular plate, the base portion (5) is arranged horizontally, the lower side of the upper wall portion (6) is connected to the width midline of the base portion (5), a plurality of through holes (12) are arranged on the base portion (5), the through holes (12) of the plurality of guardrail walls (2) correspond one-to-one with the plurality of inverted T-shaped grooves of the guardrail foundation (1), a plurality of connecting bolts pass through the through holes (12) of the plurality of guardrail walls (2) one-to-one, and are connected to the plurality of nut blocks (7) one-to-one.

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

4. The closed-cell foam aluminum sandwich ultra-high performance lightweight concrete highway guardrail according to claim 2, characterized in that: The height of the base portion (5) is 50 mm to 100 mm, and the height of the upper wall portion (6) is greater than or equal to 50 mm.

5. The closed-cell foam aluminum sandwich ultra-high performance lightweight concrete highway guardrail according to claim 1, characterized in that: One end of the upper wall portion (6) is provided with a clamping groove (11), and the other end of the upper wall portion (6) is provided with a clamping strip (13); two adjacent guardrail walls (2) are plugged in and matched with each other through the clamping groove (11) and the clamping strip (13).

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

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

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