Anti-cracking and anti-settling road structure

Abstract

The utility model relates to a kind of anti-cracking anti-settlement road structure, belong to pavement structure technical field, including base layer and pavement layer, vertical reinforced concrete column is evenly provided in base layer, backfill foundation soil layer is equipped in the below of base layer, the lower end of reinforced concrete column is into backfill foundation soil layer, a layer of gravel cushion is laid in the bottom of base layer, buffer layer made of the mixed material of rubber particle and pitch is equipped in the above of base layer, the top of reinforced concrete column is in contact with buffer layer, fiber reinforced asphalt concrete layer is equipped in the above of buffer layer, bonding layer is equipped between fiber reinforced asphalt concrete layer and pavement layer, anti-cracking net is equipped in middle in fiber reinforced asphalt concrete layer.The utility model greatly improves the bearing capacity of base layer, reduces the road settlement caused by the uneven settlement of foundation soil.Enhances the cooperative working capacity between base layer and foundation soil, forms multilayer, full range anti-cracking system, improves road service life.

Description

Technical Field

[0001] This utility model relates to a crack-resistant and settlement-resistant road structure, belonging to the field of road structure technology. Background Technology

[0002] Currently, the frequency of road use and the load-bearing pressure are constantly increasing. Traditional road structures are prone to cracking and settlement problems during long-term use. Road cracks not only affect the aesthetics of the road but also allow rainwater to seep into the roadbed, further damaging the road structure. Road settlement, on the other hand, causes uneven road surfaces, affecting driving comfort and safety, while also increasing vehicle wear and energy consumption. Although some methods exist to improve the crack resistance and settlement prevention performance of roads, such as using specific base materials and installing geogrids, their effectiveness still needs improvement, and there are shortcomings in terms of structural integrity and synergistic effects. Utility Model Content

[0003] This utility model provides a crack-resistant and settlement-resistant road structure, solving the problems existing in the above-mentioned background technology.

[0004] This utility model relates to a crack-resistant and settlement-resistant road structure, including a base layer and a pavement layer. The pavement layer is a modified asphalt concrete layer, and the base layer is made of a mixture of cement-stabilized crushed stone, fly ash, and fiber reinforcing fibers. Vertical reinforced concrete columns are uniformly arranged in the base layer. A backfill foundation soil layer is provided below the base layer, and the lower end of the reinforced concrete column extends into the backfill foundation soil layer. A gravel cushion layer is laid at the bottom of the base layer. A buffer layer made of a mixture of rubber particles and asphalt is provided above the base layer. The top of the reinforced concrete column is in contact with the buffer layer. A fiber-reinforced asphalt concrete layer is provided above the buffer layer. An adhesive layer is provided between the fiber-reinforced asphalt concrete layer and the pavement layer. A crack-resistant mesh is provided in the middle of the fiber-reinforced asphalt concrete layer.

[0005] As a preferred option, cement particles and lime particles are evenly distributed within the backfill soil layer. A geogrid is installed within the backfill soil layer to bind the soil particles together, effectively improving the strength and water stability of the foundation soil. This effectively improves the engineering properties of the foundation soil, providing a more stable foundation for the road base. Furthermore, the geogrid restricts the lateral displacement of the soil particles, enhancing the overall stability of the foundation soil.

[0006] As a preferred option, a waterproof coating layer is sprayed on top of the base layer. The waterproof coating layer on top of the base layer mainly prevents water from penetrating downwards, while the gravel cushion layer focuses on quickly draining the water that has already seeped in. Together, they can prevent the base layer from losing strength due to water accumulation, thus affecting the road's load-bearing capacity.

[0007] As a preferred embodiment, the crack-resistant mesh is composed of transverse and longitudinal ribs and is installed above the buffer layer by multiple support members. Each support member includes a support rod with a pointed bottom. A support plate is fixed to the outer wall of the support rod, and a tray is fixed to the top of the support rod. A U-shaped limiting plate for limiting adjacent longitudinal ribs is fixed to the top of the tray. A pressure plate is provided on the top of the limiting plate to press the crack-resistant mesh tightly against the limiting plate. Both ends of the pressure plate have bent edges that wrap around the bottom of both ends of the limiting plate. This allows the crack-resistant mesh to be supported in the middle of the fiber-reinforced asphalt concrete layer for better crack prevention. Furthermore, the support plate prevents the support rod from sinking into the softer buffer layer under pressure, thus preventing changes in the height of the crack-resistant mesh. The cooperation of the pressure plate and the limiting plate allows for quick clamping and fixing of the crack-resistant mesh.

[0008] As a preferred embodiment, the support rod is fitted with an adjusting sleeve, which is provided with fastening bolts to fix it to the support rod. The bottom of the adjusting sleeve is fixed to the support plate. The position of the adjusting sleeve can be adjusted according to the thickness of the fiber-reinforced asphalt concrete layer, thereby adjusting the height of the support.

[0009] As a preferred embodiment, the top outer side of the reinforced concrete column is equipped with a supporting flange, and multiple layers of limiting ring platforms are provided vertically on the sidewall of the reinforced concrete column. The supporting flange increases the contact area between the supporting pile and the buffer layer, allowing the buffer layer to fit more tightly with the top of the supporting pile during installation, resulting in more uniform force transmission between the two. The setting of the limiting ring platforms increases the friction and interlocking force between the sidewall of the reinforced concrete column and the surrounding base material. When the road is subjected to upward pull-out force (such as frost heave) or horizontal shear force (such as the force generated by vehicle braking and turning), the limiting ring platforms can effectively prevent relative displacement between the reinforced concrete column and the base material, enhance the anchoring effect of the sidewall of the reinforced concrete column in the foundation soil, improve the ability of the entire road structure to resist deformation and damage, and further enhance the anti-settlement performance of the road.

[0010] As a preferred embodiment, the thickness of the base course is 15-35 cm, the thickness of the gravel subbase is 5-10 cm, the diameter of the reinforced concrete column is 15-30 cm, the thickness of the buffer layer is 3-5 cm, the thickness of the fiber-reinforced asphalt concrete layer is 4-6 cm, and the thickness of the pavement layer is 5-8 cm.

[0011] This utility model has the following beneficial effects: The reinforced concrete columns embedded deep into the backfill soil layer of the base course effectively transfer the road load to the deep, stable foundation soil, significantly improving the base course's bearing capacity and reducing road settlement caused by uneven foundation soil settlement. Simultaneously, the gravel cushion layer further disperses the load, enhancing the synergistic working ability between the base course and the foundation soil, ensuring a stable foundation for long-term road use and effectively reducing settlement risk. The fiber reinforcement in the base course improves its crack resistance, reducing the likelihood of cracks caused by drying shrinkage, thermal shrinkage, or load effects. The elastic material in the buffer layer cushions the impact of vehicle loads, reducing impact stress on the base course and thus minimizing crack formation. The crack-resistant mesh and fiber-reinforced asphalt concrete in the crack-resistant layer work together; the mesh restricts material displacement, and the fiber-reinforced asphalt concrete disperses stress, preventing crack formation and propagation. Furthermore, it effectively prevents cracks in the pavement layer from extending downwards to the base course, forming a multi-layered, comprehensive crack-resistant system that extends road service life. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 for Figure 1 Partial structural diagram; Figure 3 for Figure 1 Enlarged structural diagram at point A; In the diagram: 1. Road surface layer; 2. Bonding layer; 3. Fiber-reinforced asphalt concrete layer; 4. Buffer layer; 5. Base layer; 6. Reinforced concrete column; 7. Gravel cushion layer; 8. Backfill foundation soil layer; 9. Fiber-reinforced filament; 10. Support flange; 11. Support rod; 12. Limiting plate; 13. Adjusting sleeve; 14. Support plate; 15. Pallet; 16. Bending edge; 17. Pressure plate; 18. Crack-resistant mesh; 19. Limiting ring platform; 20. Waterproof coating layer. Detailed Implementation

[0013] The present invention will be further described below with reference to the embodiments.

[0014] Example 1, as Figures 1 to 3As shown, this utility model is a crack-resistant and settlement-resistant road structure, including a base layer 5 and a pavement layer 1. The pavement layer 1 is a modified asphalt concrete layer. The base layer 5 is made of a mixture of cement-stabilized crushed stone, fly ash, and fiber reinforcing filaments 9. Vertical reinforced concrete columns 6 are uniformly arranged in the base layer 5. A backfill foundation soil layer 8 is provided below the base layer 5. The lower end of the reinforced concrete column 6 extends into the backfill foundation soil layer 8. A gravel cushion layer 7 is laid at the bottom of the base layer 5. A buffer layer 4 made of a mixture of rubber particles and asphalt is provided above the base layer 5. The top of the reinforced concrete column 6 is in contact with the buffer layer 4. A fiber-reinforced asphalt concrete layer 3 is provided above the buffer layer 4. An adhesive layer 2 is provided between the fiber-reinforced asphalt concrete layer 3 and the pavement layer 1. A crack-resistant mesh 18 is provided in the middle of the fiber-reinforced asphalt concrete layer 3.

[0015] During construction, the foundation pit is excavated, and the bottom of the pit is pre-compacted using a vibratory roller to ensure the compaction meets the specifications. The backfill soil layer 8 is constructed in layers, dividing the cross-section into horizontal layers and building upwards layer by layer, starting from the lowest point. The total thickness of each type of fill material should be no less than 50cm. Each layer should be constructed using a guideline, marking grids according to the volume of each truckload of soil. The loose thickness should not exceed 30cm. The surface is leveled using a grader to ensure uniform compaction. The backfill surface is sloped outwards at 3%-4% to prevent water accumulation. Next, a gravel cushion layer 7 is laid, with the gravel evenly spread and compacted to achieve the designed thickness and compaction. Then, a mixture of cement-stabilized crushed stone, fly ash, and fiber reinforcement fibers 9 is mixed according to the design proportions and spread on the gravel cushion layer 7 using a paver to ensure evenness. During the paving process, according to the design requirements of a quincunx pattern, precast reinforced concrete columns 6 are driven into the foundation soil, with the upper end of the reinforced concrete columns 6 flush with the base course mixture. Finally, a road roller is used to compact the base course mixture, gradually compacting it from low to high, and from light to heavy, until the specified compaction degree is reached. After the base course 5 is completed and reaches a certain strength, the construction of the buffer layer 4 begins. Rubber granules and asphalt are mixed and stirred according to the design mix ratio to create a buffer material with suitable fluidity and elasticity. A paver is used to evenly spread the buffer material on the base course 5, controlling the paving thickness to meet the design requirements. After paving, a light road roller is used to compact the buffer layer 4, making the surface smooth and tightly bonded to the base course 5. Then, anti-crack mesh 18 is laid. Next, fiber-reinforced asphalt concrete is mixed, with lignin fibers or basalt fibers mixed with asphalt, aggregates, etc., according to the design mix ratio to create a fiber-reinforced asphalt concrete mixture. A paver is used to spread the fiber-reinforced asphalt concrete mixture on the buffer layer 4, controlling the paving thickness and slope. After paving, a road roller is used to compact the fiber-reinforced asphalt concrete layer 3 according to the specified compaction process, ensuring that the layer achieves the designed compaction and smoothness. Then, the construction of pavement layer 1 begins. First, a high-performance asphalt binder is evenly sprayed onto the surface of the fiber-reinforced asphalt concrete layer 3 to form a bonding layer 2. Next, modified asphalt concrete is mixed with aggregates according to the designed mix proportions to create a modified asphalt concrete mixture with good performance. A paver is used to spread the modified asphalt concrete mixture onto the bonding layer 2, controlling the paving thickness, smoothness, and slope. After paving, a road roller is used for initial compaction, intermediate compaction, and final compaction to ensure that pavement layer 1 achieves the specified compaction and smoothness.

[0016] In Example 2, based on Example 1, cement particles and lime particles are evenly distributed in the backfill foundation soil layer 8. A geogrid is installed in the backfill foundation soil layer 8. During backfilling, the geogrid can be laid, and cement particles and lime particles are mixed into the backfill soil.

[0017] A waterproof coating layer 20 is sprayed on top of the base layer 5. After the base layer 5 is constructed, the waterproof coating layer 20 can be sprayed on top of the base layer 5.

[0018] The anti-crack mesh 18 is composed of horizontal and vertical ribs and is installed above the buffer layer 4 by multiple support members. Each support member includes a support rod 11 with a pointed bottom. A support plate 14 is fixed to the outer wall of the support rod 11, and a tray 15 is fixed to the top of the support rod 11. A U-shaped limiting plate 12 is fixed to the top of the tray 15 to limit the adjacent vertical ribs. A pressure plate 17 is provided on the top of the limiting plate 12 to press the anti-crack mesh 18 tightly onto the limiting plate 12. The two ends of 17 are provided with bent edges 16 that are bent and wrapped around the bottom of the two ends of the limiting plate 12. When the anti-crack net 18 is used, the support rod 11 can be inserted into the buffer layer 4, and the support plate 14 is supported on the top of the buffer layer 4. Then the outer side of the adjacent longitudinal rib of the anti-crack net 18 is limited in the groove of the limiting plate 12. Then the pressure plate 17 is used to press the anti-crack net 18. Then the two ends of the pressure plate 17 press down on the outer side of the limiting plate 12 and bend downward, and then wrap around the bottom outer side of the limiting plate 12.

[0019] An adjusting sleeve 13 is fitted over the outside of the support rod 11. The adjusting sleeve 13 is provided with fastening bolts that fix it to the support rod 11. The bottom of the adjusting sleeve 13 is fixed to the support plate 14. Before the anti-crack net 18 is laid, the fastening bolts can be loosened according to the thickness of the fiber-reinforced asphalt concrete layer 3, and then the height position of the adjusting sleeve 13 on the support rod 11 can be moved to adjust the height position of the support plate 14.

[0020] The top outer side of the reinforced concrete column 6 is provided with a supporting flange 10, and the side wall of the reinforced concrete column 6 is provided with multiple limiting ring platforms 19 along the vertical direction.

[0021] The thickness of the base course 5 is 15-35 cm, the thickness of the gravel subbase 7 is 5-10 cm, the diameter of the reinforced concrete column 6 is 15-30 cm, the thickness of the buffer layer 4 is 3-5 cm, the thickness of the fiber-reinforced asphalt concrete layer 3 is 4-6 cm, and the thickness of the pavement layer 1 is 5-8 cm.

[0022] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0023] In the description of this utility model, the terms "inner", "outer", "longitudinal", "transverse", "upper", "lower", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not require that this utility model must be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

Claims

1. A crack-resistant and settlement-resistant road structure, comprising a base layer (5) and a pavement layer (1), characterized in that: The pavement layer (1) is a modified asphalt concrete layer, the base layer (5) is made of cement-stabilized crushed stone, fly ash and fiber reinforcing wire (9) mixed together, vertical reinforced concrete columns (6) are uniformly arranged in the base layer (5), the backfill foundation soil layer (8) is provided below the base layer (5), the lower end of the reinforced concrete column (6) extends into the backfill foundation soil layer (8), a gravel cushion layer (7) is laid at the bottom of the base layer (5), a buffer layer (4) made of rubber particles and asphalt mixture is provided above the base layer (5), the top of the reinforced concrete column (6) is in contact with the buffer layer (4), a fiber-reinforced asphalt concrete layer (3) is provided above the buffer layer (4), a bonding layer (2) is provided between the fiber-reinforced asphalt concrete layer (3) and the pavement layer (1), and a crack-resistant mesh (18) is provided in the middle of the fiber-reinforced asphalt concrete layer (3).

2. The anti-crack and anti-settlement road structure according to claim 1, characterized in that: Geogrids are installed in the backfill foundation soil layer (8).

3. The anti-crack and anti-settlement road structure according to claim 2, characterized in that: A waterproof coating layer (20) is sprayed on top of the base layer (5).

4. The anti-crack and anti-settlement road structure according to claim 2, characterized in that: The anti-crack mesh (18) is composed of horizontal and vertical ribs and is installed above the buffer layer (4) by multiple support members. Each support member includes a support rod (11). The bottom of the support rod (11) is provided with a pointed tip. A support plate (14) is fixed on the outer wall of the support rod (11). A tray (15) is fixed on the top of the support rod (11). A U-shaped limiting plate (12) is fixed on the top of the tray (15) to limit the adjacent longitudinal ribs. A pressure plate (17) is provided on the top of the limiting plate (12) to press the anti-crack mesh (18) onto the limiting plate (12). Both ends of the pressure plate (17) are provided with bent edges (16) that are wrapped around the bottom of both ends of the limiting plate (12).

5. The anti-crack and anti-settlement road structure according to claim 4, characterized in that: An adjusting sleeve (13) is fitted on the outside of the support rod (11). The adjusting sleeve (13) is provided with a fastening bolt to fix it on the support rod (11). The bottom of the adjusting sleeve (13) is fixed to the support plate (14).

6. The anti-crack and anti-settlement road structure according to claim 1, characterized in that: The top outer side of the reinforced concrete column (6) is provided with a supporting flange (10), and the side wall of the reinforced concrete column (6) is provided with a multi-layer limiting ring platform (19) along the vertical direction.

7. The anti-crack and anti-settlement road structure according to claim 1, characterized in that: The thickness of the base course (5) is 15-35 cm, the thickness of the gravel cushion layer (7) is 5-10 cm, the diameter of the reinforced concrete column (6) is 15-30 cm, the thickness of the buffer layer (4) is 3-5 cm, the thickness of the fiber-reinforced asphalt concrete layer (3) is 4-6 cm, and the thickness of the pavement layer (1) is 5-8 cm.

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