A permeable roadbed base structure

Abstract

The utility model discloses a permeable roadbed base structure, including a plain soil compaction layer, a crushed stone cushion layer, a leveling layer and a permeable pavement layer stacked and connected in sequence from bottom to top; a crushed stone filling layer is stacked and connected between the crushed stone cushion layer and the leveling layer, and the crushed stone filling layer includes a geocell, the geocell is in an open state, and the pores of the geocell are filled with pressure-bearing crushed stone. The permeable roadbed base structure fills the cavity of the geocell in an open state with pressure-bearing crushed stone, and uses the geocell to fix the crushed stone to form a crushed stone filling layer, which plays a load-bearing role and ensures structural strength. There is no need to use graded crushed stone, which reduces the difficulty of procurement, and no vibration and compaction treatment are required, which is convenient for construction to improve construction efficiency. In addition, it is easy to permeate water between the pressure-bearing crushed stones in the cavity, thereby ensuring the water permeability of the crushed stone filling layer.

Description

Technical Field

[0001] The utility model relates to the technical field of roadbed, in particular to a permeable roadbed base structure. Background Art

[0002] The roadbed is the foundation of the road surface and is a geotechnical structure formed by excavation or filling. The main function of the roadbed is to provide the necessary conditions for road paving and driving, and to bear the load of locomotives, vehicles or road surfaces and traffic, while transmitting and spreading the load deep into the foundation. In civil engineering, the roadbed plays an important role in terms of construction quantity, area occupied and investment.

[0003] In the prior art, the roadbed structure mainly includes a soil compaction layer, a crushed stone cushion layer, a concrete layer, a mortar bonding layer and a pavement paving layer stacked in sequence from bottom to top. In order to ensure the water permeability of the path structure, the concrete layer in the permeable pavement base structure usually adopts a permeable concrete layer cast by graded crushed stone, and the graded crushed stone is a mixture composed of aggregates of various sizes and particle sizes. When using graded crushed stone to cast concrete, it is necessary not only to evenly mix coarse and fine crushed stone aggregates and stone chips (fine gravel or coarse sand can be used instead when stone chips are scarce) of different particle sizes, but also to vibrate and compact the different aggregates after they are evenly mixed, so that different particle sizes of crushed stone need to be purchased in the graded crushed stone, which increases the difficulty of procurement and causes the use of graded crushed stone to cast permeable concrete. The construction procedure of the layer is complicated, which reduces the construction efficiency of the permeable roadbed foundation structure; in addition, in order to facilitate water permeability, the formed concrete layer usually has permeable holes. Although the permeable holes are convenient for water permeability, they damage the structural strength of the concrete layer. That is, when the number of permeable holes in the concrete layer increases, although the permeability is improved, the structural strength of the concrete layer also decreases accordingly. That is, for the permeable concrete layer, it is impossible to take into account both its structural strength and permeability. When one of the structural strength and permeability is improved, the other characteristic will inevitably decrease, which is easy to cause a contradiction between the structural strength and the permeability.

[0004] Therefore, it is necessary to improve the permeable roadbed base structure in the prior art. Utility Model Content

[0005] The purpose of the utility model is to overcome the defects in the prior art and provide a permeable roadbed base structure which is easy to purchase raw materials, reduces construction difficulty, improves construction efficiency and takes into account both structural strength and permeability.

[0006] In order to achieve the above technical effects, the technical solution of the utility model is: a permeable roadbed base structure, including a soil compaction layer, a crushed stone cushion layer, a leveling layer and a permeable pavement layer stacked and connected in sequence from bottom to top;

[0007] A crushed stone filling layer is stacked and connected between the crushed stone cushion layer and the leveling layer. The crushed stone filling layer includes a geocell. The geocell is in an open state. The pores of the geocell are filled with pressure-bearing crushed stones.

[0008] Preferably, in order to enhance the water permeability, in the geocell, any two adjacent cavities are connected by a water permeable through hole.

[0009] Preferably, in order to further enhance the water permeability, in the geocell, any two adjacent cavities are connected by a plurality of water permeable through holes.

[0010] Preferably, in order to prevent the pressure-bearing crushed stone from escaping from the cavity of the geotextile format through the water-permeable through holes, the particle size of the pressure-bearing crushed stone is larger than the aperture of the water-permeable through holes.

[0011] Preferably, in order to ensure the smoothness of the road surface, the leveling layer includes a crushed stone leveling layer, the crushed stone leveling layer includes leveling crushed stones, and the particle size of the leveling crushed stones is 3-15 mm.

[0012] Preferably, in order to further ensure the flatness of the road surface, the leveling layer also includes a stone leveling layer stacked on the crushed stone leveling layer, the stone leveling layer includes leveling stone, and the particle size of the leveling stone is larger than the pores of adjacent leveling crushed stones.

[0013] Preferably, in order to facilitate paving, the particle size of the leveling stone is 2-6 mm.

[0014] Preferably, in order to ensure the structural strength and water permeability of the gravel filling layer, the thickness of the gravel filling layer is 80-250 mm.

[0015] Preferably, in order to prevent the crushed stones in the leveling layer from falling into the crushed stone filling layer, reducing the road surface strength and causing road surface collapse, a geotextile is provided between the leveling layer and the crushed stone filling layer.

[0016] Preferably, in order to ensure the water permeability of the permeable pavement layer, the permeable pavement layer includes a plurality of permeable bricks connected in sequence.

[0017] To sum up, compared with the prior art, the permeable roadbed base structure of the utility model fills the cavity of the geocell in an open state with pressurized crushed stone, and uses the geocell to fix the crushed stone to form a crushed stone filling layer, which plays a load-bearing role and ensures structural strength. There is no need to use graded crushed stone, which reduces the difficulty of procurement, and no vibration and compaction treatment are required, which facilitates construction to improve construction efficiency. In addition, water is easy to penetrate between the pressurized crushed stones in the cavity, thereby ensuring the permeability of the crushed stone filling layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the first embodiment of the utility model;

[0019] Figure 2 This is a schematic structural diagram of a geocell according to a first embodiment of the present utility model;

[0020] Figure 3 yes Figure 2 A top view of

[0021] Figure 4 yes Figure 2 A magnified view of part A;

[0022] Figure 5 It is a structural schematic diagram of the second embodiment of the utility model;

[0023] Figure 6 It is a structural schematic diagram of the third embodiment of the utility model;

[0024] Figure 7 This is a schematic diagram of the structure of the fourth embodiment of the utility model

[0025] Figure 8 This is a schematic structural diagram of a plate material according to a fourth embodiment of the present utility model;

[0026] Fig. 9 This is a schematic diagram of the structure of a plate material according to the fifth embodiment of the utility model;

[0027] In the figure: 100, compacted soil layer; 200, crushed stone cushion layer; 300, stone leveling layer; 400, permeable pavement layer; 401, permeable brick; 500, crushed stone filling layer; 600, geocell; 601, cavity; 602, permeable through hole; 700, pressure-bearing crushed stone; 800, crushed stone leveling layer; 801, leveling crushed stone; 900, geotextile; 110, plate; 111, drainage through hole; 112, interlocking protrusions; 113, interlocking depressions. DETAILED DESCRIPTION

[0028] The following is a further description of the specific implementation of the present invention in conjunction with the accompanying drawings and embodiments. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0029] First embodiment

[0030] like Figure 1-Figure 4 As shown, the permeable roadbed base structure of the first embodiment of the utility model includes a bare soil compaction layer 100, a crushed stone cushion layer 200, a leveling layer and a permeable pavement layer 400 which are stacked and connected in sequence from bottom to top, a crushed stone filling layer 500 is stacked and connected between the crushed stone cushion layer 200 and the leveling layer, and the crushed stone filling layer 500 includes a geocell 600, the geocell 600 is in an open state, and the cavity 601 of the geocell 600 is filled with pressure-bearing crushed stone 700.

[0031] Specifically, in the present embodiment, the bare soil compaction layer 100 is the foundation of the permeable roadbed base structure, and is usually formed by a bare soil tamping construction method. The bare soil tamping means to tamp and fill the bare soil. The bare soil is a natural sedimentary soil layer that is not doped with other impurities and has a fine and uniform density and a certain viscosity. Tamping is to tamp and fill the backfilled soil layer by layer. There are usually many methods such as manual, mechanical, and vehicle methods. By tamping and filling the bare soil, a bare soil compaction layer 100 is formed to prevent the roadbed surface from settling.

[0032] The main raw material of the gravel cushion layer 200 is gravel of various particle sizes. As an example, the gravel cushion layer 200 can be obtained by compacting coarse sand alone, or by using medium-coarse sand, pebbles, etc. with good gradation and hard texture, and compacted and formed in multiple layers. The appropriate scheme is selected according to different roadbeds and local geographical conditions. This embodiment is not specifically limited here. There are also many construction methods for the gravel cushion layer 200, such as using a grader and a bulldozer to cooperate in construction, a loader and a watering truck to cooperate in mixing, or using a paver to construct and a mixer to mix, so that the gravel cushion layer 200 is stacked and laid on the plain soil compaction layer 100. The gravel cushion layer 200 is used to treat weak foundations, diffuse stress, and drain water. It can also accelerate the consolidation and settlement of the lower soil layer and accelerate the drainage and consolidation of the foundation. In order to ensure the support strength of the gravel cushion layer 200, the thickness of the gravel cushion layer 200 is preferably within 100-250mm.

[0033] The gravel filling layer 500 is stacked between the leveling layer and the gravel cushion layer 200 to support the leveling layer and the permeable pavement layer 400 above. After the roadbed base structure is formed, when it rains, the accumulated water on the road surface passes through the permeable pavement layer 400 and the leveling layer in turn and then enters the gravel filling layer 500, and flows downward through the permeable gap holes inside the gravel filling layer 500 to achieve a permeable effect.

[0034] The leveling layer is stacked between the crushed stone filling layer 500 and the permeable pavement layer 400 . The main function of the leveling layer is to ensure the flatness of the pavement and facilitate the laying of the permeable pavement layer 400 .

[0035] The permeable pavement layer 400 is mainly composed of a plurality of bricks laid on the leveling layer and connected in sequence. In order to further ensure the permeability of the roadbed base structure, the bricks are preferably permeable bricks 401, that is, the permeable pavement layer 400 includes a plurality of permeable bricks 401 connected in sequence. Furthermore, the permeable bricks 401 can also be interlocking gap permeable bricks 401. When the permeable bricks 401 are laid on the leveling layer, the adjacent permeable bricks 401 are interlocked and connected to prevent the permeable bricks 401 from loosening and shifting. For example, the permeable bricks 401 in this embodiment are selected from the permeable bricks disclosed in the Chinese utility model patent with announcement number CN213295940U, the interlocking permeable bricks disclosed in the Chinese utility model patent with announcement number CN216663665U, or the base permeable I-shaped bricks suitable for different road surfaces disclosed in the Chinese utility model patent with announcement number CN216663666U, all of which can achieve the above-mentioned technical effects, so they are not described here.

[0036] In order to facilitate the forming of the gravel filling layer 500, reduce the construction difficulty, improve the construction efficiency and take into account the structural strength and water permeability of the gravel filling layer 500, in this embodiment, the gravel filling layer 500 mainly includes a geocell 600 and pressure-bearing gravel 700 filled in the cavity 601 of the geocell 600. The geocell 600 is a mesh cell structure formed by strong welding or riveting of a high-strength HDPE or PP copolymer wide band. The geocell 600 is flexible and can be folded up during transportation to reduce its size and facilitate transportation. It is opened when in use to expand the size of the cavity 601, and the pressure-bearing gravel 700 is filled in the cavity 601. The geocell 600 is used to fix the pressure-bearing gravel 700 without vibration and compaction treatment, thereby forming a structure with strong lateral restriction and high rigidity. The geocell 600 has excellent properties such as light material, wear resistance, stable chemical properties, acid and alkali resistance, and is flexible, which makes the transportation volume small, further facilitates transportation, and reduces transportation costs; not only that, the geocell 600 has high lateral restriction and anti-slip functions. When in use, it is opened and the pressure-bearing gravel 700 is filled into the cavity 601 of the geocell 600. No compaction and vibration treatment are required to form a structurally stable support body, which is convenient for construction and improves construction efficiency. Not only that, there are gaps between the pressure-bearing gravel 700 filled in the cavity 601 of the geocell 600. The gaps are permeable pores, through which the accumulated water on the top surface of the gravel filling layer 500 can flow downward. To the bottom of the gravel filling layer 500, water permeability is achieved to achieve a water permeable effect; it should be noted that, in this embodiment, there is no special requirement for the particle size of the pressure-bearing gravel 700 filled in the pore 601 of the geocell 600. Compared with the concrete layer in the prior art, it is necessary to use graded gravel that is evenly mixed and configured in a specific proportion. This embodiment reduces the use requirements of the pressure-bearing gravel 700, that is, during construction, it is only necessary to meet the pressure-bearing gravel 700 that can be filled in the pore 601 of the geocell 600. Therefore, the pressure-bearing gravel 700 is easier to purchase and convenient for construction, and there is no need to purchase gravel of different particle sizes and mix gravel of different particle sizes in a specific proportion, so it is more conducive to improving construction efficiency.

[0037] Of course, it should be noted that the geocell 600 may also be a fixed geocell 600, that is, the geocell 600 is initially in an open state, so that when laying, there is no need to perform operations such as piling, and the opened geocell 600 can be directly laid on the gravel cushion layer 200.

[0038] A further improvement is that, in the geocell 600, any two adjacent cavities 601 are connected by a plurality of water-permeable through holes 602. By providing a plurality of water-permeable through holes 602, it is convenient for water to flow between the gaps of the pressure-bearing crushed stone 700 in the cavities 601 in the geocell 600, so that in addition to flowing downward, the water flow at the smaller gap in the cavities 601 of the geocell 600 also flows to the position with larger gaps of the pressure-bearing crushed stone 700, flows downward through the larger gap position, accelerates water permeability, and further improves the water permeability.

[0039] A further improvement is that the particle size of the pressure crushed stone 700 is larger than the aperture of the water-permeable through hole 602. With the above design, the pressure crushed stone 700 can be prevented from being separated from the cavity 601 from the water-permeable through hole 602 after the crushed stone filling layer 500 is subjected to pressure. Therefore, after the particle size of the pressure crushed stone 700 and the aperture of the water-permeable through hole 602 are restricted as above, the pressure crushed stone 700 can be confined in the cavity 601, and as the pressure crushed stone 700 is filled in the cavity 601, the technical effect of fixing the pressure crushed stone 700 is finally achieved.

[0040] A further improvement is that the thickness of the gravel filling layer 500 is 80-250 mm. Preferably, the thickness of the gravel filling layer 500 is 150 mm. Specifically, the height of the geocell 600 is 150 mm, so that the gravel filling layer 500 has a certain height to ensure its structural strength and load-bearing capacity, while taking into account the water permeability, so that the water flow in the leveling layer can flow downward through the gravel filling layer 500 into the gravel cushion layer 200.

[0041] A further improvement is that the leveling layer includes a crushed stone leveling layer 800, the crushed stone leveling layer includes a leveling crushed stone 801, and the particle size of the leveling crushed stone 801 is 3-15 mm.

[0042] After the pressure-bearing crushed stone 700 is filled in each cavity 601 of the geocell 600, a leveling crushed stone 801 with a particle size of 3-15 mm is laid on the upper surface of the crushed stone filling layer 500 for leveling treatment to form a crushed stone leveling layer 800. The upper surface of the crushed stone leveling layer 800 is flat, which is convenient for laying a horizontal permeable pavement layer 400 to ensure the flatness of the surface of the permeable roadbed base structure.

[0043] Second embodiment

[0044] like Figure 5 As shown, the permeable roadbed base structure of the second embodiment is based on the first embodiment, with the difference that the leveling layer also includes a rice stone leveling layer 300 stacked on the crushed stone leveling layer 800, and the rice stone leveling layer 300 includes leveling rice stones, and the particle size of the leveling rice stones is larger than the pores of the adjacent leveling crushed stones 801. Specifically, the particle size of the leveling rice stones is 2-6m.

[0045] Compared with the first embodiment, this embodiment forms a leveling stone leveling layer 300 by laying leveling stones. The particle size of the leveling stones is smaller. Through secondary leveling, it is more conducive to ensuring the flatness of the permeable surface layer 400, thereby facilitating safe travel of vehicles and people.

[0046] Third embodiment

[0047] like Figure 6 As shown, the permeable roadbed base structure of the third embodiment is based on the second embodiment, and the difference is that a geotextile 900 is arranged between the leveling layer and the gravel filling layer 500 .

[0048] Specifically, the geotextile 900 is stacked between the gravel filling layer 500 and the gravel leveling layer 800. After the geocell 600 is laid and the pressure-bearing gravel 700 is loaded into the geocell 600, the gravel filling layer 500 is formed. The geotextile 900 is laid on the gravel filling layer 500, and the leveling gravel 801 is laid on the geotextile 900. This can prevent the leveling gravel 801 from falling downward into the gap between the pressure-bearing gravel 700. In this way, the structural strength reduction caused by the falling of the leveling layer gravel is avoided, which causes the road surface to collapse. Therefore, by laying the geotextile 900 on the gravel filling layer 500, the normal use of the permeable roadbed base structure can be further guaranteed.

[0049] Fourth embodiment

[0050] like Figure 7 and Figure 8 As shown, the permeable roadbed base structure of the fourth embodiment is based on the third embodiment, with the difference that the leveling layer further includes a plurality of plates 110 laid on the crushed stone leveling layer 800 and connected in sequence in the same plane.

[0051] Compared with the use of leveling rice stone to form the rice stone leveling layer 300, in this embodiment, a plurality of plates 301 are connected in sequence to form a foundation for the laying of permeable bricks 401. Therefore, there is no need to mix mortar on site during construction, which reduces the consumption of water and electricity, and avoids the air pollution generated during the mortar production process and the respiratory health hazards to the on-site workers. In addition, the plates 110 are spliced ​​in sequence to facilitate the rapid formation of the leveling layer, which is conducive to improving construction efficiency, and avoids the uneven mixing of the mortar, which leads to inconsistent density at various places of the layer, resulting in differences, making the part with lower density prone to depression after long-term pressure, thereby causing uneven road surface. Therefore, in this embodiment, after the leveling layer is formed by connecting a plurality of plates 110 in sequence, it can be ensured that the density of the leveling layer is consistent at various places, and the surface of the roadbed base structure is flat, which is conducive to the safe travel of vehicles and passers-by.

[0052] A further improvement is that the plate 110 is an EVA plate 110, and the plate 110 is provided with drainage holes 111 extending in the thickness direction thereof, and the drainage holes 111 are arranged in a rectangular array and densely distributed on the plate 111. After adopting the above structure, the plate 110 is an EVA plate 110, which is conducive to reducing the weight of the plate 110, thereby reducing the transportation cost of the plate 110, and ensuring the structural strength of the plate 110, thereby ensuring its load-bearing capacity. Moreover, the EVA plate 110 has slight elasticity, and slightly deforms after being subjected to pressure from above, and the EVA plate 110 restores its previous shape after the pressure is eliminated, thereby extending the service life of the plate 110; moreover, the densely distributed drainage holes 111 on the plate 110 facilitate the downward flow of accumulated water on the road surface, so that the water flows through the plate 110 into the gravel filling layer 500, so as to achieve a water-permeable effect.

[0053] Fifth embodiment

[0054] like Fig. 9 As shown, the permeable roadbed base structure of the fifth embodiment is based on the fourth embodiment, with the difference that the circumferential outer edge of the plate 110 is provided with matching interlocking protrusions 112 and interlocking recesses 113, and the interlocking protrusions 112 of one of the two adjacent plates 110 are interlocked with the interlocking recesses 113.

[0055] Compared with the fourth embodiment, after the interlocking protrusions 112 and the interlocking recesses 113 are arranged around the plates 110, the stability of the connection between the plates 110 can be ensured, and the plates 110 can be prevented from relative displacement, thereby ensuring the stability of the leveling layer structure.

[0056] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A permeable roadbed base structure, comprising a soil compaction layer (100), a crushed stone cushion layer (200), a leveling layer and a permeable pavement layer (400) stacked and connected in sequence from bottom to top, characterized in that: A crushed stone filling layer (500) is stacked and connected between the crushed stone cushion layer (200) and the leveling layer. The crushed stone filling layer (500) includes a geocell (600). The geocell (600) is in an open state. The pores (601) of the geocell (600) are filled with pressure-bearing crushed stone (700).

2. The permeable roadbed base structure according to claim 1, characterized in that: In the geocell (600), any two adjacent cavities (601) are connected by a water-permeable through hole (602).

3. The permeable roadbed base structure according to claim 2, characterized in that: In the geocell (600), any two adjacent cavities (601) are connected by a plurality of water-permeable through holes (602).

4. The permeable roadbed base structure according to claim 2, characterized in that: The particle size of the pressure-bearing crushed stone (700) is larger than the aperture of the water-permeable through hole (602).

5. The permeable roadbed base structure according to claim 1, characterized in that: The leveling layer comprises a crushed stone leveling layer (800), and the crushed stone leveling layer comprises leveling crushed stones (801), and the particle size of the leveling crushed stones (801) is 3-15 mm.

6. The permeable roadbed base structure according to claim 5, characterized in that: The leveling layer further comprises a rubble leveling layer (300) stacked on the crushed stone leveling layer (800), wherein the rubble leveling layer (300) comprises rubble leveling stones, and the particle size of the rubble leveling stones is larger than the pores of the adjacent rubble leveling stones (801).

7. The permeable roadbed base structure according to claim 6, characterized in that: The particle size of the leveling stone is 2-6 mm.

8. The permeable roadbed base structure according to claim 1, characterized in that: The thickness of the crushed stone filling layer (500) is 80-250 mm.

9. The permeable roadbed base structure according to claim 1, characterized in that: A geotextile (900) is arranged between the leveling layer and the crushed stone filling layer (500).

10. The permeable roadbed base structure according to claim 1, characterized in that: The permeable pavement layer (400) comprises a plurality of permeable bricks (401) connected in sequence.

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