Highway guardrail convenient to repair

Abstract

The invention belongs to the technical field of road guardrails, and particularly relates to a road guardrail convenient to repair, which comprises upright posts and guardrail plates, the upright posts further comprise lower upright posts positioned underground and upper upright posts positioned above the ground, and foundation pits used for placing the lower upright posts and provided with inner walls made of reinforced concrete are arranged below the upright posts. The foundation pit is densely filled with a buffer block; a plurality of extrusion blocks which are staggered in the radial direction of the lower stand column are fixed on the lower stand column. The problems that in the prior art, a guardrail is difficult to repair, and the repair cost is high are solved; when collision energy is small, the buffer blocks in the foundation pit can fully absorb energy, collision deformation of the stand columns is reduced, the repairing difficulty of the stand columns is lowered, the maintenance cost is reduced, and the maintenance time is saved. When collision is severe, the stand columns abut against the edge of the foundation pit, and the automobile is prevented from rushing out of the road through the rigidity of the stand columns and extrusion of the extrusion blocks on the buffer blocks.

Description

[0001] This application is a divisional application of “A highway guardrail that is easy to repair”. The original application number is 2023106947343 and the application date is June 13, 2023. Technical Field

[0002] The invention belongs to the technical field of highway guardrails, and in particular relates to a highway guardrail that is easy to repair. Background Art

[0003] The erection of highway guardrails is a key measure to prevent cars from running off the road in the event of an accident. In the prior art, guardrails use the deformation of guardrail panels, columns and foundation pits to absorb collision energy. When an accident occurs, guardrails with less damage can continue to be used after being repaired with special equipment. When guardrail panels and columns cannot be repaired, they can be replaced, but replacement of parts will greatly increase costs; repair of foundation pits requires the use of special equipment or reselection of pile positions. The former is more complicated and time-consuming, while the latter requires the modification of the guardrail panel structure to match the new piles. The repair costs of these two methods are relatively high compared to guardrail panels and columns. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a highway guardrail that is easy to repair, so as to solve the problem that the guardrail is difficult to repair and has a high repair cost in the prior art.

[0005] The present invention is achieved through the following technical solutions: A highway guardrail that is easy to repair, including a column and a guardrail plate, wherein the column includes a lower column located below the ground and an upper column located above the ground, and a foundation pit for placing the lower column is arranged under the column, the inner wall of the foundation pit is made of reinforced concrete, and the foundation pit is densely filled with buffer blocks; the buffer blocks are spherical and made of frosted stones. The buffer blocks include different spheres with diameters of 10-50 mm. A plurality of extrusion blocks are fixed on the lower column, and the extrusion blocks are staggered along the radial direction of the lower column.

[0006] Preferably, the cross-section of the foundation pit is square or circular, with a side length or radius of 200-300 mm and a depth of 400-600 mm; the length of the lower column is 80-90% of the depth of the foundation pit; and the length of the extrusion block is 70-90% of the side length or radius of the foundation pit.

[0007] Preferably, the angle between the center line of the extrusion block and the column along the axial downward direction is 60-90 degrees.

[0008] Preferably, a cover plate is provided on the top of the foundation pit.

[0009] Preferably, the extrusion block is in the shape of a cylinder, a square or a flat plate.

[0010] Preferably, the wide surface of the flat extrusion block is parallel to the horizontal plane.

[0011] The principle of the present invention is that when a car hits a column or guardrail, the impact force is transmitted to the buffer block through the column and the extrusion block, so that the buffer blocks move relative to each other, generating a certain resistance to prevent the column from tilting. The resistance of the column can be changed by adjusting the size of the foundation pit, the position and size of the extrusion block, and the size and shape of the buffer block.

[0012] When the impact force of the car is large, the lower column abuts against the edge of the foundation pit, and the impact force continues to be borne by the column's own rigidity. The extrusion block also dissipates energy by extruding the buffer block to prevent the car from running off the road. After the lower column abuts against the edge of the foundation pit, the reaction force of the inner wall of the foundation pit on the column makes it difficult for the column to rotate, thereby providing sufficient support for the upper column. The upper end of the column cooperates with the guardrail to intercept the car, further preventing the car from running off the road.

[0013] After a minor collision, the collision energy is absorbed by the friction between the buffer blocks inside the foundation pit, the column only tilts, and the position of the buffer block moves. When repairing, only some buffer blocks are taken out, the column is straightened, the buffer blocks are refilled and compacted, and the cover is covered.

[0014] The beneficial effects of the present invention are as follows: when the collision energy is small, the buffer block in the foundation pit can fully absorb the energy, reduce the collision deformation of the column, reduce the difficulty of repairing the column, reduce the maintenance cost, and save maintenance time. When the collision is more severe, the column rests on the edge of the foundation pit and relies on its own rigidity and the extrusion of the buffer block by the extrusion block to prevent the car from running off the road. At the same time, the reaction force of the inner wall of the foundation pit on the column can further prevent the car from running off the road. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the structure of Embodiment 1 after being impacted; Figure 2 This is a schematic diagram of the structure of the second embodiment after being hit hard; In the attached figure: 1 column, 2 guardrail plate, 3 extrusion block, 4 buffer block, 5 foundation pit, 6 cover plate, 7 steel bar. DETAILED DESCRIPTION

[0016] Embodiment 1: As attached Figure 1As shown, the foundation pit is an incomplete ellipsoidal structure with an opening at the upper end. The inner wall of the foundation pit 5 is tied with a steel skeleton and poured with concrete, and a concrete cover plate 6 is provided at the upper opening. The constructed depth is 1.4m, the diameter of the opening is 0.5m, and the widest part of the foundation pit is 0.5m. The inside of the foundation pit 5 is filled with buffer blocks 4 and compacted. The buffer blocks 4 are spherical ground stones with a diameter of 20mm-50mm. 14 extrusion blocks 3 are fixed along the depth direction of the column 1. The extrusion blocks 3 are cylindrical. The center line of the extrusion block 3 and the downward angle of the column 1 along the axis are both 70°, and the extrusion block 3 is in close contact with the buffer block 4.

[0017] The beneficial effect of this embodiment is that the buffer block has a good fit with the inner wall of the foundation pit, and the buffer blocks of different diameters can be densely arranged, which has a better energy absorption effect. The variable angle of the lower column is larger, so that the extrusion block can fully squeeze the buffer block, reduce the collision deformation of the guardrail plate and the column, and thus reduce the difficulty of repairing the column; the steps of replacing the buffer block during foundation pit repair are simple and low in cost.

[0018] Embodiment 2: Attached Figure 2 This is a schematic diagram of the structure of the third embodiment after a large impact. The main difference between this embodiment and the first embodiment is that the inclination degree of the column and the inclination angle of the extrusion block are different.

[0019] Specifically, the extrusion block in this embodiment is in the shape of a cylinder, and the cylinder is horizontally fixed to the lower column. Figure 2 The schematic diagram of the column toppling in Example 3 when the collision energy is large is shown. The interior of the foundation pit 5 is filled with buffer blocks 4 and compacted. The buffer blocks 4 are spherical ground stones with a diameter of 20mm-50mm. 14 extrusion blocks 3 are fixed along the depth direction of the column 1. The extrusion blocks 3 are horizontally welded to the lower column so that the extrusion blocks 3 and the buffer blocks 4 are in close contact.

[0020] During the collision, the upper column is hit and tilted, and the upper column is against the edge of the foundation pit 5. At this time, the extrusion block 3 of the lower column is horizontal and can be fully rotated and can be fully in contact with the buffer block 4. Under the action of the extrusion block 3, the buffer block 4 in the foundation pit 5 is partially worn. At the same time, the surface of the extrusion block has been partially deformed. The lower column is tilted against the reinforced concrete on the inner wall of the foundation pit, but the buffer blocks inside the foundation pit are still densely arranged. The upper column is deformed because it cannot continue to tilt, and the upper column is bent at the contact point at the edge of the foundation pit. The cover plate is not shown in the figure, and the cover plate has been partially damaged during the tilting of the column.

[0021] The beneficial effect of this embodiment is that the buffer block has a good fit with the inner wall of the foundation pit, and buffer blocks of different diameters can be densely arranged, which has a better energy absorption effect. The contact area between the extrusion block and the buffer block is large, and the angle rotation range is large, so that the extrusion block can fully extrude the buffer block and reduce the collision deformation of the guardrail and the column. At the same time, the reaction force of the inner wall of the foundation pit on the column makes it difficult for the column to rotate, thereby providing sufficient support for the upper column. The upper end of the column cooperates with the guardrail to intercept the car, further preventing the car from running off the road. This embodiment further reduces the difficulty of repairing the column; the step of replacing the stone during foundation pit repair is simple and low-cost.

[0022] The above are only preferred embodiments of the present invention. Any person skilled in the art may modify the present invention by using the above technical solutions or modify it into an equivalent technical solution. Therefore, any simple modification or equivalent replacement made according to the technical solution of the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A highway guardrail that is easy to repair, comprising a column (1) and a guardrail plate (2), wherein the column (1) comprises a lower column located below the ground and an upper column located above the ground, characterized in that: A foundation pit (5) for placing a lower column is provided under the column (1); the inner wall of the foundation pit (5) is made of reinforced concrete, and the foundation pit is densely filled with a buffer block (4); the buffer block (4) is spherical and made of ground stone; the buffer block (4) includes different spheres with a diameter of 10-50 mm; a plurality of extrusion blocks (3) are fixed on the lower column, and the extrusion blocks (3) are staggered along the radial direction of the lower column; the length of the lower column is 80-90% of the depth of the foundation pit; and a cover plate (6) is provided on the top of the foundation pit (5).

2. A highway guardrail that is easy to repair as claimed in claim 1, characterized in that: The cross section of the foundation pit (5) is square or circular, with a side length or radius of 200-300 mm and a depth of 400-600 mm; the length of the extrusion block (3) is 70-90% of the side length or radius of the foundation pit.

3. The highway guardrail that is easy to repair as claimed in claim 1, characterized in that: The included angle between the center line of the extrusion block (3) and the column (1) along the axial downward direction is 60-90 degrees.

4. The highway guardrail that is easy to repair as claimed in claim 1, characterized in that: The extrusion block (3) is cylindrical, square or flat.

5. The highway guardrail that is easy to repair as claimed in claim 4, characterized in that: The wide surface of the flat plate-shaped extrusion block (3) is parallel to the horizontal plane.

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