A local self-recovering metal beam-column guardrail end protection facility

Abstract

The present invention relates to the field of road traffic safety facilities, and in particular to a partially self-recovering metal beam-column guardrail end protection facility. The metal beam-column guardrail end protection facility is composed of a nested beam group, a collapsible column, a guide slide rail, and a flexible energy-absorbing pad. After a vehicle collides with the flexible energy-absorbing pad, it first pushes the semi-cylindrical foam structure to compress the rectangular box and the buffer spring. When the buffering capacity of the energy-absorbing pad reaches the limit value, the connected guide support structure and the beam slide along the fixed track, the column rotates and collapses, the unhooking connecting plate is separated from the column, and the collision energy is converted into deformation energy and kinetic energy. The present invention can effectively improve the buffering capacity at the end of the guardrail and reduce the consequences of accidents after vehicle collisions.

Description

Technical Field

[0001] The present invention relates to the field of road traffic safety facilities, in particular to a local self-recovering metal beam-column type guardrail end protection facility. Background Art

[0002] With the development of road infrastructure construction technology in my country, increased awareness of traffic safety, heightened demands for environmental aesthetics, and limited road construction space, metal beam-and-column guardrails, with their aesthetically pleasing appearance, high strength, minimal deformation, lightweight structure, small footprint, and easy maintenance, have been widely adopted in recent years. Their proven effectiveness has been proven in practice. However, compared to concrete and corrugated guardrails, metal beam-and-column guardrails are a relatively new technology, resulting in relatively limited research and application, particularly regarding methods and techniques for safely handling guardrail ends.

[0003] The ends of guardrails are a frequent site of traffic accidents. The current "Code for the Design of Urban Road Traffic Facilities (2019 Edition)" (GB 50688-2011) and the "Code for the Design of Highway Traffic Safety Facilities" (JTG D81-2017) both stipulate that the ends of crash barriers should be treated for safety. However, due to the lack of safety treatment methods for the ends of metal beam-column guardrails, the ends of metal beam-column guardrails are often left untreated or simply treated with hard concrete piles, crash barrels, warning posts, etc., representing a weak point in road protection and posing a significant safety hazard. For metal beam-column guardrails, if the ends are not effectively treated, the crossbeam at the end of the guardrail can easily penetrate the vehicle body in the event of a high-speed collision, causing serious personal injury and property damage. Therefore, it is essential to propose a local self-recovering end protection device with a buffering and energy-absorbing effect for metal beam-column guardrails. Summary of the Invention

[0004] The main purpose of the present invention is to provide a local self-recovering metal beam-column guardrail end protection facility, which is used for the safe treatment of the end of the metal beam-column guardrail on the road side. It can effectively improve the buffering capacity at the guardrail end and reduce the consequences of accidents after vehicle collision.

[0005] In order to achieve the above-mentioned purpose, the technical solution of the present invention is as follows: a local self-recovering metal beam-column guardrail end protection facility, including a nested beam group, a collapsible column, a guide slide rail and a flexible energy-absorbing pad, characterized in that the nested beam group is composed of a plurality of groups of metal beams of different sizes, and the socket section is connected by bolts through a round-bottom flask-shaped reserved hole and a circular reserved hole, with the right end away from the guardrail end as the right, the right end of the beam group is welded to the flexible energy-absorbing pad, and the left end of the beam group is socketed with the roadside beam-column guardrail beam, and a decoupling connecting plate is welded on the back of each beam, which is fixed to the collapsible column with a bolt through the decoupling connecting plate; the collapsible column is composed of an H-type column, a rectangular base, a rolling bolt, a buffer spring and a safety baffle, and the column has a rectangular base Welded to the guide slide rail base plate; the slide rail base plate is fixed to the ground and the roadside guardrail concrete foundation, and a serrated slide is provided on the upper part, and the guide support structure on the slide is welded to the flexible energy-absorbing pad; the flexible energy-absorbing pad is composed of a semi-cylindrical foam structure, a high-rebound rectangular box, an internal buffer spring and a cable buckle connection, and the cable buckle is slidably connected to the adjacent reversible column. When the vehicle collides with the flexible energy-absorbing pad, the semi-cylindrical foam structure compresses the rectangular box and the buffer spring, and then the cable buckle slides down along the column opening until it is tightened. When the buffering capacity of the energy-absorbing pad reaches the limit value, it pushes the column to rotate and fall down in turn and detach from the beam, and at the same time pushes the connected guide support structure and the beam to slide along the fixed serrated track, completing the conversion of collision energy into deformation energy and kinetic energy.

[0006] Furthermore, the cross-sectional shape and thickness of each beam in the nested cross-beam group are consistent with those of the roadside metal beam-column guardrail. The cross-sectional dimensions of the beams fixed on the same column are the same, and the length of each side is 5 to 10 mm longer than that of the beams fixed on the adjacent column on the left, and they are sequentially sleeved on the right cross-beam, with a sleeve length of 350 to 550 mm. In the beam sleeve section, a round-bottom flask-shaped reserved hole is excavated on the outer cross-beam, wherein the bottleneck part is 20 to 40 mm long, the bottom part has a diameter of 30 to 40 mm, and the bottle mouth faces the end of the beam-column guardrail. A circular reserved hole is excavated on the inner cross-beam, and the two beams are connected by bolts through the round-bottom flask shape and the circular reserved hole. When the right cross-beam moves to the left, the bolt moves through the bottleneck to the bottom of the bottle and falls off, thereby realizing further movement and overlapping of the beams.

[0007] Furthermore, a decoupling connecting plate is welded on the back of each beam of the nested beam group, the length of the connecting plate is the same as the length of the column, the height of the connecting plate is 80 to 100 mm higher than the height of the beam, the center line of the height of the connecting plate is flush with the center line of the height of the beam, the middle part is welded to the back of the beam, and two oblique openings are reserved at the top and bottom of the connecting plate that does not overlap with the back of the beam, and the openings face the flexible energy-absorbing pad on the right side; the welding position of the connecting plate on the corresponding beam starts from the flexible energy-absorbing pad along the driving direction, and the right side of the connecting plate on the back of the first group of beams is flush with the right side of the beam, and the distance between the right side of the connecting plate welded on the back of each subsequent group of beams and the right side of the beam is equal to the length of the previous group of beams, so that the outer moving beam can push the connecting plate welded on the inner beam to slide to the right and disengage from the column.

[0008] Furthermore, the main body of the retractable column is composed of an upper H-shaped column and a lower rectangular base connected by rolling bolts to form an axial rotation structure; two buffer springs are arranged on the right side of the column, the bottom end of the spring is welded to the top surface of the rectangular base, and the top end of the spring is fastened to the top surface of the H-shaped column through bolts and iron sheets; the column rotates counterclockwise after being pushed to the left, and falls over after being separated from the connecting plate, and the buffer spring is stretched and deformed. In order to prevent the spring from falling off and flying out after deformation, a 30-50mm high safety baffle is welded on the upper part of the right side of the column; in addition, a 10mm wide opening is reserved at the center line of the web of the H-shaped column of the rightmost retractable column, and the height of the opening is the same as the compressible length of the spring in the energy-absorbing end.

[0009] Furthermore, the flexible energy-absorbing pad is a combination of a rectangular parallelepiped and a semi-cylinder. The width of the energy-absorbing pad is equal to the width of the concrete foundation of the roadside beam-column guardrail, and the height of the bottom surface of the energy-absorbing pad from the ground is between the height of the concrete foundation of the beam-column guardrail and the distance between the bottom surface of the lowest crossbeam and the ground; the semi-cylinder is made of porous energy-absorbing foam as a solid structure, and the rectangular parallelepiped is made of high-rebound plastic as an internal hollow rectangular box, and thick steel plates are fixed on the left outer wall and the right inner wall of the rectangular box; 7 buffer springs are arranged inside, distributed in 3 rows and 3 columns, and a steel cable is welded to the lower side of the middle spring in the uppermost row. After the steel cable passes through the opening of the web of the adjacent collapsible column, it is welded to the slider on the left side of the web to form a cable buckle, which can provide a lateral pulling force to the right for the collapsible column to enhance the stability of the collapsible column.

[0010] Furthermore, the guide rail is composed of a 30-50 mm thick base plate and a guide support structure, wherein a toothed slide is provided on the base plate, each protruding tooth has a height of 10-20 mm and a slope of the bevel is not greater than 45°; the guide support structure is composed of multiple short steel pipes, 1 long steel pipe and 1 pulley, the number of short steel pipes is the number of guardrail beams minus 1, each short steel pipe is parallel to the ground and welded to the long steel pipe at a 60° angle, and each welding position is aligned with each guardrail beam.

[0011] The present invention has the following beneficial effects:

[0012] This system provides a certain degree of energy absorption and buffering through the deformation of flexible energy-absorbing pads, the collapse of columns, and the movement of crossbeams, improving the safety of the metal beam-column guardrail end and reducing the damage caused by colliding vehicles. Furthermore, the system has a certain degree of self-recovery capability. In low-speed collisions that do not cause structural damage, the system automatically rebounds, reducing maintenance workload and material consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The present invention is further described in detail with reference to the accompanying structural drawings below.

[0014] Figure 1 It is an overall layout diagram of a specific embodiment of the present invention.

[0015] Figure 2 This is a partial connection diagram of the socket beam of a specific embodiment of the present invention.

[0016] Figure 3 It is a schematic diagram of the installation of a decoupling connecting plate and a collapsible column in a specific embodiment of the present invention.

[0017] Figure 4 It is a partial perspective view of a flexible energy-absorbing pad according to a specific embodiment of the present invention.

[0018] Figure 5 It is a rear view of the overall structure of a specific embodiment of the invention.

[0019] Figure numerals: 1. Nested beam group; 2. Retractable column; 3. Flexible energy-absorbing pad; 4. Guide rail; 5. Roadside metal beam-column guardrail beam; 6. Roadside metal beam-column guardrail concrete foundation; 11. First beam group; 12. Second beam group; 13. Third beam group; 14. Round-bottom flask-shaped reserved hole; 15. Circular reserved hole; 16. Unhooking connecting plate; 161. Oblique opening of connecting plate; 21. H-shaped column; 22. Rectangular base; 23. Connecting bolt; 24. Buffer spring; 25. Safety baffle; 31. Semi-cylindrical foam structure; 32. High-rebound rectangular box; 33. Internal buffer spring; 34. Steel cable; 35. Slider; 36. Reserved opening of column web; 41. Guide rail bottom plate; 411. Toothed slide; 42. Guide support structure. DETAILED DESCRIPTION

[0020] To make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0021] like Figure 1 As shown, a metal beam-column guardrail end protection facility includes a nested beam group 1, a collapsible column 2, a flexible energy-absorbing pad 3 and a guide rail 4.

[0022] The nested beam group 1 is composed of multiple sets of metal beams of different sizes, each of which is made of the same cross-sectional shape, thickness, and material as the roadside metal beam-post guardrail beams. Each beam fixed to the same post is called a beam group. From right to left, they are numbered as the first beam group 11, the second beam group 12, the third beam group 13, and so on. The number of beam groups can be 2 to 4, and the number of groups increases with the increase in the design speed of the road. The cross-sectional dimensions of the same beam group are the same, while the side lengths of the cross-sectional dimensions of different beam groups gradually increase by 5 to 10 mm from left to right.

[0023] The right end of the nested beam group 1 is welded to the flexible energy absorbing pad 3, and the left end is sleeved on the roadside metal beam column guardrail beam 5, and different beam groups are sequentially sleeved on the adjacent beam group on the right, with a sleeve length of 350 to 550 mm.

[0024] like Figure 1 and Figure 2 As shown, two round-bottom flask-shaped reserved holes 14 are respectively excavated on the top and bottom surfaces of the left end of each beam in each beam group, wherein the bottleneck portion is 20 to 40 mm long, the diameter of the circular hole at the bottom of the bottle is 30 to 40 mm, and the bottle mouth faces the end of the beam-column guardrail; for the remaining beam groups except the first beam group, two circular reserved holes 15 are respectively excavated on the top and bottom surfaces of the right end of each beam in the group, and the diameter of the circular hole is 30 to 40 mm; when the beams are socketed, the circular reserved hole at the right end of the inner beam is aligned with the bottle mouth of the flask-shaped reserved hole at the left end of the outer beam, and then fixed by bolts, and the diameter of the outer nut of the fixing bolt is larger than the bottleneck width, and the diameter of the inner nut is larger than the diameter of the circular reserved hole.

[0025] like Figure 1 and Figure 3 As shown, a decoupling connecting plate 16 is welded on the back of each beam in the beam group. The length of the connecting plate is the same as the length of the column, and the height of the connecting plate is 80 to 100 mm higher than the height of the beam. The middle part of the connecting plate is welded to the back of the beam where it overlaps with the beam. Two oblique openings 161 are reserved at the top and bottom of the connecting plate where it does not overlap with the back of the beam, with the upper opening facing the upper right and the lower opening facing the lower right. The right side of the connecting plate on the back of the first beam group 11 is flush with the right side of the beam, and the distance between the right side of the welded connecting plate on the back of other beam groups and the right side of the beam is equal to the length of the previous group of beams. When installing the beam and the retractable column, first fix the decoupling connecting plate 16 to the column 2 with bolts, and then weld the decoupling connecting plate 16 to the corresponding beam.

[0026] like Figure 3As shown, the retractable column is composed of an H-shaped column 21, a rectangular base 22, connecting bolts 23, a buffer spring 24, and a safety baffle 25. The rectangular base 22 is welded to the guide rail bottom plate 31, and the welding position is determined by the length and width of the corresponding beam group, the installation position and thickness of the unhooking connecting plate 16; after the rectangular base is fixed, the H-shaped column 21 spans the rectangular base 22 and is connected to the base through bolts 23 to form an axial rotation structure; in order to increase the stability and self-recovery of the column, a buffer spring 24 is provided on the right side of each type of H-shaped column 21, and the top of the spring is fastened to the top of the H-shaped column 21 through iron sheet and bolts, and the bottom end of the spring is welded to the top surface of the rectangular base 22; in order to prevent the spring from detaching and flying out when the column collapses and the spring is deformed, a 30-50mm high safety baffle 25 is welded on the right side of each type of H-shaped column 21 from the top surface.

[0027] like Figure 4 As shown, the flexible energy absorbing pad is composed of a semi-cylindrical foam structure 31, a high-rebound rectangular box 32, an internal buffer spring 33, a steel cable 34 and a slider 35, wherein the width of the semi-cylindrical foam structure 31 and the high-rebound rectangular box 32 is equal to the width of the roadside beam-column guardrail concrete foundation 6, and the height of the bottom surface of the semi-cylindrical foam structure 31 and the high-rebound rectangular box 32 from the ground is between the height of the beam-column guardrail concrete foundation 6 and the distance between the bottom surface of the lowest crossbeam of the guardrail and the ground; the semi-cylindrical foam structure 31 adopts porous The energy-absorbing foam is constructed as a solid structure. The high-rebound rectangular box 32 is made of high-rebound plastic with a hollow interior. Thick steel plates are fixed to the left and right inner walls of the rectangular box. Seven buffer springs 33 are installed inside, arranged in three rows and three columns: 3, 2, and 2 from top to bottom, and 3, 1, and 3 from front to back. A steel cable 34 is welded to the underside of the middle spring in the top row. After passing through an opening 36 in the web of the adjacent collapsible column, it is welded to a slider 35 on the left side of the web, forming a cable clip. Finally, the surface of the energy-absorbing pad is coated with yellow and black reflective film and treated for rust.

[0028] like Figure 5 As shown, the guide rail 4 consists of a 30-50 mm thick base plate 41 and a guide support structure 42, wherein the base plate 41 is fixed to the ground and the roadside metal beam-column guardrail concrete foundation 6, and a toothed slide 411 is provided on the base plate 41, each protruding tooth has a height of 10-20 mm and a slope of the bevel is not greater than 45°, and the guide support structure 42 consists of a plurality of short steel pipes, a long steel pipe and a pulley, the number of short steel pipes is the number of guardrail beams minus 1, and each short steel pipe is parallel to the ground and welded to the long steel pipe at a 60° angle, and the welding position is aligned with each beam.

[0029] The energy-absorbing and buffering capacity of this facility can effectively avoid serious structural damage and casualties caused by the insertion of the crossbeam into the vehicle body when the vehicle directly collides with the end of the steel guardrail, thereby improving roadside traffic safety. At the same time, the flexible energy-absorbing pads and collapsible columns of this facility have a certain self-recovery ability. When a low-speed collision does not cause damage to the structural connection, the facility can automatically rebound, thereby reducing the maintenance workload.

[0030] The energy-absorbing and buffering capacity of this facility can effectively avoid serious structural damage and casualties caused by the insertion of the crossbeam into the vehicle body when the vehicle directly collides with the end of the steel guardrail, thereby improving roadside traffic safety. At the same time, the flexible energy-absorbing pads and collapsible columns of this facility have a certain self-recovery ability. When a low-speed collision does not cause damage to the structural connection, the facility can automatically rebound, thereby reducing the maintenance workload.

Claims

1. A local self-recovering metal beam-column guardrail end protection facility, comprising a nested beam group (1), a collapsible column (2), a guide rail (4) and a flexible energy-absorbing pad (3), characterized in that: The nested crossbeam group (1) includes a plurality of metal crossbeams of different sizes nested in sequence along the driving direction, connected by bolts through overlapping round-bottom flask-shaped reserved holes (14) and circular reserved holes (15) at both ends of the crossbeams, the end of the crossbeam group is fitted with the end crossbeam of the roadside beam-column guardrail, the head end of the crossbeam group is welded to the flexible energy-absorbing pad (3), and the back of each crossbeam in the crossbeam group is welded with a decoupling connecting plate (16) and then fixed to the collapsible column (2) by bolts; the bottom plate of the guide slide rail (4) is fixed to the ground and the roadside concrete foundation, a toothed slideway (411) is provided on the bottom plate, the collapsible column (2) is welded on the upper part of the bottom plate, the slide rail guide support structure (42) is welded to the flexible energy-absorbing pad (3), and the flexible The flexible energy-absorbing pad (3) includes a semi-cylindrical foam structure (31), a high-rebound rectangular box (32), an internal buffer spring (33) and a cable buckle. The cable buckle is slidably connected to the adjacent collapsible column (2). When a vehicle collides with the flexible energy-absorbing pad (3), the semi-cylindrical foam structure (31) compresses the high-rebound rectangular box (32) and the internal buffer spring (33), and then the cable buckle slides downward along the column opening until it is tightened. When the buffering capacity of the flexible energy-absorbing pad (3) reaches a limit value, it pushes the column to rotate and collapse in turn and detach from the beam, and at the same time pushes the connected guide support structure (42) and the beam to slide along the fixed toothed slideway (411), completing the conversion of collision energy into deformation energy and kinetic energy. The cross-section shape and thickness of the cross-beams in the nested cross-beam group (1) are consistent with those of the roadside metal beam-column guardrail, and the cross-section dimensions of the cross-beams fixed to the same column are the same; with the end of the beam-column guardrail being the right, the cross-beams fixed to different columns have a cross-section side length larger than that of the cross-beams on the adjacent columns on the left, and are sequentially sleeved onto the front cross-beams; the sleeved cross-beams are fixed by bolts, and a circular reserved hole (15) is excavated at the right end of the cross-beam, and a round-bottomed flask-shaped reserved hole (14) is excavated at the left end, with the flask mouth facing the end of the beam-column guardrail.

2. The partially self-recovering metal beam-column guardrail end protection facility according to claim 1, characterized in that: A decoupling connecting plate (16) is welded to the back of each crossbeam in the nested crossbeam group (1), and oblique openings (161) are respectively reserved at the top and bottom of the connecting plate.

3. The partially self-recovering metal beam-column guardrail end protection facility according to claim 1 is characterized in that: The upper H-shaped column (21) and the lower rectangular base (22) of the collapsible column (2) are connected by rolling bolts. Two buffer springs (24) are provided on the right side of the column. The top of the spring is fastened to the top surface of the H-shaped column (21) by bolts. The bottom of the spring is welded to the top surface of the rectangular base (22). A high safety baffle (25) is welded to the upper right side of the H-shaped column (21). A web opening (36) is provided at the center line of the web of the H-shaped column (21) of the rightmost collapsible column (2). The height of the opening is the same as the compressible length of the spring in the energy absorbing end.

4. The partially self-recovering metal beam-column guardrail end protection facility according to claim 1 or 3 is characterized in that: The flexible energy-absorbing pad (3) is in the shape of a combination of a cuboid and a semi-cylinder, wherein the semi-cylinder is made of porous energy-absorbing foam as a solid structure, and the cuboid is made of high-rebound plastic as an internal hollow rectangular box, the left outer wall and the right inner wall of the rectangular box are fixed with thick steel plates, and a plurality of buffer springs (24) and a cable buckle consisting of a steel cable (34) and a slider (35) are arranged inside; wherein the slider (35) is arranged on the left side of the web of the adjacent collapsible column (2), and the steel cable (34) passes through the web opening (36) and is welded to the top of the side of the rectangular box to form a stable structure of the collapsible column (2).

5. The partially self-recovering metal beam-column guardrail end protection facility according to claim 1 is characterized in that: The guide rail (4) comprises a thick bottom plate (41) and a guide support structure (42), wherein a toothed slideway (411) is provided on the bottom plate; the guide support structure (42) comprises a plurality of short steel pipes, long steel pipes and pulleys, each short steel pipe is parallel to the ground and welded to the long steel pipe at a certain angle, and each welding position is aligned with each cross beam of the guardrail.

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