Ecological permeable paving system and construction method thereof

Abstract

The invention belongs to the technical field of municipal construction, and particularly relates to an ecological water-permeable paving system and a construction method thereof.The water-permeable paving system comprises a foundation soil layer, a broken stone hardcore and a surface layer which are arranged from bottom to top, the surface layer comprises a plurality of water-permeable bricks laid in the horizontal direction, and the top faces of the water-permeable bricks are flush; the filter sand layer is arranged between the broken stone hardcore layer and the surface layer, and zeolite powder is uniformly filled in the filter sand layer; a filling gap between every two adjacent water permeable bricks is filled with broken stones; the water permeable bricks are anchored on the filtering sand layer through anchor bolts; the top surface of the anchor bolt is positioned in the counterbore; epoxy resin blocks are further filled and poured in the counter bores, and the top surfaces of the epoxy resin blocks are flush with the top surfaces of the water permeable bricks. The structure is stable, pavement accumulated water is reduced, water infiltrating into the foundation soil layer is purified, and environmental protection is achieved; the water permeable bricks can be laid by adopting a dry laying method, the construction period is shortened, the construction efficiency is improved, and manpower and cost are saved.

Description

Technical Field

[0001] The present invention belongs to the technical field of municipal construction, and in particular relates to an ecological permeable pavement system and a construction method thereof. Background Art

[0002] With the acceleration of urbanization, the area of ​​hardened urban ground continues to increase. The surface layer of urban outdoor hardened ground is generally a hardened layer of concrete, asphalt, or cement. Although these surface hardened layers have good strength and durability, their permeability is poor. Rainwater cannot quickly penetrate into the ground, resulting in increased surface runoff, insufficient replenishment of urban groundwater resources, and decreased humidity in the urban underground soil, which in turn leads to a deterioration of the urban ecological environment and easily causes urban waterlogging. To address these prominent issues, parking lots, sidewalks, and some light-load road sections in the city are all hardened and covered with a permeable paving system.

[0003] Currently, permeable pavement systems primarily consist of a soil base layer, a base layer, and a surface layer, arranged sequentially from bottom to top. The base layer in permeable pavement systems is mostly made of permeable concrete or semi-rigid inorganic binder-stabilized gravel, while the surface layer is generally assembled from permeable bricks. Mortar, cement, and other materials are used to fill and bond adjacent permeable bricks to ensure the integrity of the pavement. Rigid permeable concrete or semi-rigid inorganic binder-stabilized gravel contain large amounts of cement, lime, fly ash, and other cementitious materials, as well as natural aggregates. These base materials must be transported to the site by tank truck for pouring and laying. After laying, they must be cured for a certain age before the surface layer can be laid, resulting in low construction efficiency. The permeable bricks used in existing surface layers are mostly extruded from cement, sand, slag, fly ash, and other materials, resulting in low strength and easy fracturing. When replacing damaged permeable bricks, the damaged permeable bricks are still bonded to adjacent permeable bricks through mortar, cement, etc., and a hammer and a crowbar are needed to lift the damaged permeable bricks out. When laying new permeable bricks, mortar, cement, and other adhesives are still needed to bond them to other permeable bricks around them to prevent the permeable bricks from moving horizontally. This results in high maintenance costs and wastes manpower. In addition, when the above-mentioned permeable paving system is used in industrial plants such as chemical plants, pharmaceutical plants, and mechanical processing plants, trace amounts of chemical raw materials, heavy metal elements, lubricating oils, and other pollutants will inevitably adhere to the surface of such parks. These pollutants will seep into the soil along with the water, polluting the groundwater and affecting the ecological environment. Summary of the Invention

[0004] The technical problems to be solved by the present invention are: to provide an ecological permeable paving system with excellent water permeability and water storage performance, which has a stable structure, reduces road surface water accumulation, purifies the water that infiltrates into the foundation soil layer, and is green and environmentally friendly; to provide a method for laying the ecological permeable paving system, which can complete the laying of permeable bricks by dry laying method, does not require maintenance, shortens the construction period, improves the construction efficiency of the ecological permeable paving system, and saves manpower and construction costs.

[0005] The technical solution adopted by the present invention to solve this technical problem is: an ecological permeable paving system, comprising a base soil layer, a crushed stone cushion layer and a surface layer arranged in sequence from bottom to top, the surface layer comprising a plurality of permeable bricks laid in a horizontal direction, the top surfaces of the plurality of permeable bricks being flush; and a filter sand layer arranged between the crushed stone cushion layer and the surface layer, the filter sand layer being evenly filled with zeolite powder.

[0006] There is a filling joint between two adjacent permeable bricks, and the filling joint is filled with gravel; the permeable brick is provided with a countersunk hole perpendicular to the horizontal plane, and the countersunk hole is provided with an anchor bolt, and the permeable brick is anchored to the filter sand layer through the anchor bolt; the top surface of the anchor bolt is located in the countersunk hole; the countersunk hole is also filled and cast with an epoxy resin block, and the top surface of the epoxy resin block is flush with the top surface of the permeable brick.

[0007] Furthermore, the crushed stone cushion layer is formed by paving a plurality of crushed stones with a particle size of 20-40 mm, the porosity of the crushed stone cushion layer accounts for more than 40% of its total volume; the thickness of the crushed stone cushion layer is 150 mm;

[0008] The filter sand layer is paved with a mixture of quartz sand and zeolite powder. The particle size of the quartz sand in the filter sand layer is 0.3-0.6 mm, and the zeolite powder in the filter sand layer accounts for 5% of the total volume of the filter sand layer. The thickness of the filter sand layer is above 50 mm.

[0009] Furthermore, a geotextile is laid between the filter sand layer and the surface layer.

[0010] Furthermore, the gravel filling rate of the filling joint is above 95%, and the gravel in the filling joint is gravel with a particle size of 2-4 mm.

[0011] Furthermore, the permeable brick includes a permeable bottom plate and a permeable top plate detachably installed above the permeable bottom plate; the permeable bottom plate is evenly provided with a plurality of lower permeable holes that pass through the top and bottom, and the permeable top plate is evenly provided with a plurality of upper permeable holes that pass through the top and bottom, and the upper permeable holes are connected to the lower permeable holes and the apertures of both are above 10 mm.

[0012] Furthermore, the top surface of the permeable bottom plate is provided with a convex positioning block, and the bottom surface of the permeable top plate is provided with a concave positioning groove. The cross-sectional outer contour of the positioning block and the cross-sectional outer contour of the positioning groove are adapted in shape and size, and the positioning block is inserted into the positioning groove; a compression rubber pad is provided between the groove wall of the positioning groove and the side wall of the positioning block, and the material of the compression rubber pad is EPDM rubber.

[0013] Furthermore, a guide hole connected to the upper water permeable hole is provided on the side wall of the permeable top plate, and the guide holes are arranged in a plurality, and the plurality of guide holes are evenly distributed along the circumference of the permeable top plate; the guide holes are arranged obliquely downward from an end away from the upper water permeable hole to an end close to the upper water permeable hole.

[0014] Furthermore, a plurality of weight-reducing holes are provided on the top surface of the permeable top plate, and the plurality of weight-reducing holes are evenly distributed in the horizontal direction; the weight-reducing holes are filled with gravel with a particle size of 2-4 mm.

[0015] Furthermore, the top surface of the permeable roof is sprayed with a hydrophobic coating, and the contact angle of the hydrophobic coating is greater than or equal to 120°;

[0016] The hydrophobic coating is a SiO2 hydrophobic coating.

[0017] The construction method for laying any of the above-mentioned ecological permeable pavement systems comprises the following steps:

[0018] S1. Clean the construction site, excavate the foundation pit to the specified depth, and then compact the soil at the bottom of the foundation pit to form a foundation soil layer. After the foundation soil layer is completed, test its compaction degree;

[0019] S2. Lay 20-40 mm thick gravel on top of the foundation soil layer and compact it using a flat plate vibrator to form a gravel cushion layer. The settlement difference of the gravel cushion layer during the compaction process using the flat plate vibrator must be ≤ 2 mm / 3 m.

[0020] S3, laying a mixture of quartz sand and zeolite powder on the gravel cushion to form a filter sand layer, scraping the filter sand layer flat and spraying a bio-enzyme curing agent, and the curing waiting time of the curing agent is ≤ 2h;

[0021] S4, laying geotextile on the surface of the filter sand layer;

[0022] S5. Lay permeable bricks on top of the geotextile, using a laser locator to assist in the arrangement of the permeable bricks. After the permeable bricks are laid, fill the gaps between the permeable bricks with 2-4 mm gravel to form a surface layer. The gravel filling rate must be ≥ 95%.

[0023] S6. Insert the anchor bolts into the countersunk holes of the permeable bricks and anchor the anchor bolts in the filter sand layer. Finally, use epoxy resin to grout the countersunk holes of the permeable bricks to fix the anchor bolts. The implantation depth of the anchor bolts is required to be ≥150 mm.

[0024] Compared with the prior art, the beneficial effects of the present invention are: providing an ecological permeable paving system and a construction method thereof, which have excellent permeability and reduce road surface waterlogging; when the amount of water seeping under the road surface is large, the road surface water body can continuously seep down and be stored in the gaps of the gravel cushion layer, ensuring that the road surface water body continuously seeps down, reducing the probability of road surface waterlogging and urban flood disasters. Among them, the zeolite powder in the filter sand layer adsorbs harmful substances such as heavy metal ions, ammonia nitrogen ions, pathogens, etc. in the water body to purify the water body, and then purifies the water body that seeps into the base soil layer, avoiding harmful substances from seeping into the ground and causing groundwater and soil pollution, which is green and environmentally friendly. In addition, the present invention anchors the permeable bricks on the surface of the filter sand layer by anchor bolts, avoiding horizontal displacement of the permeable bricks and improving the structural stability of the entire paving system. The permeable bricks can be laid by dry paving method, without the need for maintenance, shortening the construction period, improving the construction efficiency of the ecological permeable paving system, saving manpower and construction costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic cross-sectional view of the ecological permeable pavement system of the present invention;

[0026] Figure 2 Schematic diagram of the top view of the ecological permeable pavement system of the present invention;

[0027] Figure 3 for Figure 1 A schematic diagram of the enlarged structure of the middle part A;

[0028] Figure 4 This is a schematic diagram of the axial structure of an embodiment of the permeable brick of the present invention;

[0029] Figure 5 This is a schematic diagram of the structure of the permeable brick after the permeable top plate and the permeable bottom plate are separated;

[0030] Figure 6 It is along Figure 5 Schematic diagram of the cross-sectional structure in the direction of the cross-sectional line BB;

[0031] Figure 7 This is a structural diagram of an embodiment of a permeable bottom plate of a permeable brick in the present invention;

[0032] Figure 8 1 is a structural diagram of an embodiment of a permeable top plate of a permeable brick in the present invention;

[0033] Figure numerals: 1-foundation soil layer; 2-gravel cushion layer; 3-filter sand layer; 4-surface layer; 41-filling joint; 5-permeable brick; 51-permeable bottom plate; 511-lower permeable hole; 52-permeable top plate; 521-upper permeable hole; 53-positioning block; 54-positioning groove; 55-compression rubber pad; 56-diversion hole; 57-weight reduction hole; 58-hydrophobic coating; 6-anchor bolt; 7-geotextile. DETAILED DESCRIPTION

[0034] The present invention will be further described below with reference to the accompanying drawings and examples.

[0035] As attached Figure 1-8 As shown, an ecological permeable paving system includes a base soil layer 1, a crushed stone cushion layer 2 and a surface layer 4 arranged in sequence from bottom to top, the surface layer 4 includes a plurality of permeable bricks 5 laid in a horizontal direction, and the top surfaces of the plurality of permeable bricks 5 are flush; it also includes a filter sand layer 3 arranged between the crushed stone cushion layer 2 and the surface layer 4, and the filter sand layer 3 is evenly filled with zeolite powder; there is a filling joint 41 between two adjacent permeable bricks 5, and the filling joint 41 is filled with crushed stone; the permeable brick 5 is provided with a countersunk hole perpendicular to the horizontal plane, and the countersunk hole is provided with an anchor bolt 6, and the permeable brick 5 is anchored to the filter sand layer 3 by the anchor bolt 6; the top surface of the anchor bolt 6 is located in the countersunk hole; the countersunk hole is also filled and cast with an epoxy resin block, and the top surface of the epoxy resin block is flush with the top surface of the permeable brick 5. The anchor bolts 6 are generally made of stainless steel screws, and the pull-out force of each horse butt bolt 6 after anchoring is required to be above 8KN.

[0036] When rainwater falls on the road surface, a portion of the water is filtered through the permeable pores of the permeable bricks 5 and then seeps into the filter sand layer 3. Another portion of the water is initially filtered through the filler in the filler joints 41 between the permeable bricks 5 and then seeps into the filter sand layer 3. The water in the filter sand layer 3 undergoes secondary purification and filtration in the filter sand layer 3 before continuing to seep into the gravel cushion layer 2 and finally seeping into the base soil layer 1 through the gaps in the gravel cushion layer 2. The filler in the filler joints 41 is gravel, not mortar or cement. The filler joints 41 in the surface layer 4 have excellent water permeability, improving the infiltration efficiency of the surface layer 4 and reducing road surface waterlogging. The base soil layer 1 is denser and has lower infiltration efficiency than the gravel cushion layer 2, surface layer 4, and filter sand layer 3 above it. When the amount of water seeping into the road surface is large, the water can continue to seep down and be stored in the gaps in the gravel cushion layer 2, ensuring continuous infiltration of the road surface water and reducing the probability of road surface waterlogging and urban flooding. The zeolite powder within the filter sand layer 3 absorbs harmful substances such as heavy metal ions, ammonia nitrogen ions, and pathogens from the water, purifying it. This purifies the water that seeps into the foundation soil layer 1, preventing harmful substances from seeping into the ground and contaminating groundwater and soil. This is environmentally friendly. Furthermore, the present invention secures the permeable bricks 5 to the surface of the filter sand layer 3 using anchor bolts 6. This allows for the dry-laying method to complete the installation of the permeable bricks 5, eliminating the need for maintenance and shortening the construction period. This improves the efficiency of the ecological permeable paving system, saving both manpower and construction costs.

[0037] The foundation soil layer 1 is a compacted soil layer, which is mainly used to support the gravel cushion layer 2, filter sand layer 3 and surface layer 4 above it and to ensure the stability of the entire ecological permeable pavement system. The soil compaction degree of the foundation soil layer 1 is generally required to be above 93%. In addition to supporting the filter sand layer 3 and surface layer 4 above it, the gravel cushion layer 2 is also used to store water that has not been absorbed in time by the foundation soil layer 1 after infiltration, so as to ensure that the road surface water continues to infiltrate and reduce the probability of road surface water. Preferably, the gravel cushion layer 2 is paved with multiple pieces of gravel with a particle size of 20-40mm, and the porosity of the gravel cushion layer is more than 40% of its total volume; the thickness of the gravel cushion layer 2 is 150mm. While ensuring the stability of the gravel cushion layer 2, its water storage rate is guaranteed to be 30L / m 2 above.

[0038] The filter sand layer 3 is generally paved with crushed stone, fine sand and zeolite powder, and is mainly used to filter and purify water that has infiltrated from the surface layer 4. Preferably, the filter sand layer 3 is paved with a mixture of quartz sand and zeolite powder, the particle size of the quartz sand in the filter sand layer 3 is 0.3-0.6 mm, and the zeolite powder in the filter sand layer 3 accounts for 5% of the total volume of the filter sand layer 3; the thickness of the filter sand layer 3 is more than 50 mm. The infiltration path of the water in this layer is long enough and the filter pores are fine enough to fully filter the water. By controlling the proportion of zeolite powder, the water purification effect is ensured while ensuring the water seepage efficiency of the filter sand layer 3. The uniformity coefficient of the mixture of quartz sand and zeolite powder is less than or equal to 1.5.

[0039] The surface layer 4 is a hardened road surface that provides convenient passage for vehicles and personnel while also filtering surface water for drainage into the ground. The permeable bricks 5 within the surface layer 4 are the primary hardened structure of the surface layer 4. To prevent fine sand in the filter sand layer 3 from clogging the permeable holes in the permeable bricks 5 and facilitating the installation of the surface layer 4, a geotextile 7 is preferably laid between the filter sand layer 3 and the surface layer 4 to prevent damage to the filter sand layer 3 during construction.

[0040] The gravel in the filling joint 41 between the adjacent permeable bricks 5 in the surface layer 4 can be filled or filled to a certain thickness. The gravel therein can also be replaced by fine sand. Preferably, the gravel filling rate of the filling joint 41 is above 95%, and the gravel in the filling joint 41 is gravel with a particle size of 2-4 mm. The filtering effect of water infiltrating through the filling joint is improved. In addition, sand and gravel are more rounded than other gravel, and are safer and more beautiful. The upper surface of the gravel filling structure in the filling joint 41 should be slightly lower than the top surface of the permeable brick 5 to prevent the gravel in the filling joint 41 from rolling out and affecting traffic.

[0041] The permeable brick 5 is the main hardened structure in the surface layer 4. It is prefabricated in the factory from permeable concrete and then transported to the site for paving. The permeable brick 5 can be an integral structure formed in one piece, or it can be a combined structure assembled from multiple plate-like structures. Preferably, the permeable brick 5 includes a permeable bottom plate 51 and a permeable top plate 52 detachably mounted above the permeable bottom plate 51; the permeable bottom plate 51 is evenly provided with a plurality of lower permeable holes 511 that pass through from top to bottom, and the permeable top plate 52 is evenly provided with a plurality of upper permeable holes 521 that pass through from top to bottom, the upper permeable holes 521 are interconnected with the lower permeable holes 511, and the apertures of both are above 10 mm. The aperture of the permeable holes on the permeable brick 5 is set to be above 10 mm to ensure the permeability of the permeable brick 5, to prevent the permeable holes from being blocked by debris such as sand and dust, which affects the drainage of the road surface, and to improve the permeability efficiency of the entire ecological permeable paving system. The permeable bricks 5 are configured as a detachable assembly structure, which not only increases the strength of the permeable bricks 5 but also allows the permeable top plate 52 to be removed and cleaned when the permeable holes are blocked. Similarly, if the permeable top plate 52 is damaged, only the permeable top plate 52 can be replaced without replacing the entire permeable brick 5, allowing for quick repair of the road surface.

[0042] The permeable bottom plate 51 and the permeable top plate 52 are both cast and formed from recycled aggregate permeable concrete, where the recycled aggregate accounts for ≥60%. The permeable concrete mix ratio is cement: recycled aggregate: silica fume: water reducer = 1:4:0.1:0.02, and the water-cement ratio is 0.28. After the permeable bottom plate 51 and the permeable top plate 52 are cast and formed, they are placed in a steel mold for steam curing at a temperature of 60°C and a humidity of 90% for 8 hours. The compressive strength of the permeable bottom plate 51 and the permeable top plate 52 should be above 35 MPa, and the permeability coefficient should be above 10 mm / s. The surface area of ​​a single drainage module is generally 0.062 m2 and the weight is less than 12 kg. Recycled aggregate refers to a granular structure processed from concrete, mortar, stone, bricks and tiles found in construction waste.

[0043] To facilitate the prefabrication and assembly of the permeable bricks 51, the shapes and sizes of the outer contours of the projections of the permeable bottom plate 51 and the permeable top plate 52 on the horizontal plane should be the same. The permeable bottom plate 51 and the permeable top plate 52 can be polygonal plate structures such as triangles, rectangles, pentagons or hexagons. The shapes and sizes of the cross sections of the lower permeable holes 511 and the upper permeable holes 521 can be the same or different. Preferably, the apertures of the lower permeable holes 511 and the upper permeable holes 521 are both 10 mm, and the hole spacing between the two adjacent lower permeable holes 511 is 50 mm. This ensures the strength of the entire drainage module while ensuring water seepage efficiency.

[0044] The permeable bottom plate 51 and the permeable top plate 52 can be connected by connectors such as latches and bolts, or they can be connected by a mortise and tenon structure. Preferably, the top surface of the permeable bottom plate 51 is provided with an upwardly convex positioning block 53, and the bottom surface of the permeable top plate 52 is provided with an upwardly concave positioning groove 54. The cross-sectional outer contour of the positioning block 53 matches the shape and size of the cross-sectional outer contour of the positioning groove 54, and the positioning block 53 is inserted into the positioning groove 54. The positioning block 53 and the permeable bottom plate 51 are integrally cast and molded as a whole. When the permeable bottom plate 51 and the permeable top plate 52 are connected, no other connectors are required, facilitating assembly and disassembly of the two. Alternatively, a convex positioning block 53 can be provided on the bottom surface of the permeable top plate 52, and a concave positioning groove 54 can be provided on the top surface of the permeable bottom plate 51. The cross-sectional shapes of the positioning groove 54 and the positioning block 53 are the same, and the fitting tolerance between the two is ±0.5 mm. Generally, the depth of the positioning groove 54 is set to 10 mm, and the height of the positioning block 53 is 8 mm. As a further preference, a compression rubber pad 55 is provided between the groove wall of the positioning groove 54 and the side wall of the positioning block 53. By providing the compression rubber pad 55, the positioning groove 54 and the positioning block 53 are firmly connected, thereby improving the connection stability between the permeable bottom plate 51 and the permeable top plate 52. The compression rubber pad 55 can be made of rubber materials such as natural rubber and styrene-butadiene rubber. As a further preference, the material of the compression rubber pad 55 is EPDM rubber. EPDM rubber is an ethylene propylene diene monomer rubber with a hardness of 60±5 Shore A and a compression rate of 30%. It has excellent aging resistance such as ozone resistance, heat resistance, and weather resistance, further ensuring the connection stability between the permeable bottom plate 51 and the permeable top plate 52.

[0045] In order to further improve the water seepage efficiency at the filling seam 41, preferably, the side wall of the permeable top plate 52 is provided with a guide hole 56 connected to the upper permeable hole 521. The guide holes 56 are provided in a plurality, and the plurality of guide holes 56 are evenly distributed along the circumference of the permeable top plate 52. The guide holes 56 are mainly used to guide the water between two adjacent drainage modules into the upper permeable hole 521. The guide holes 56 can be parallel to the top and bottom surfaces of the permeable top plate 52, or can be arranged obliquely relative to the top surface of the permeable top plate 52. As a further preference, the guide holes 56 are arranged obliquely downward from the end away from the upper permeable hole 521 to the end close to the upper permeable hole 521, thereby accelerating the speed at which the water between the two adjacent drainage modules is discharged into the upper permeable hole 521, further improving the infiltration efficiency of the water between the two adjacent drainage modules. The distance between the guide hole 56 located on the side wall of the permeable top plate 52 and the top surface of the permeable top plate 52 is generally greater than or equal to 5 mm, and the slope of the guide hole 56 is 1%.

[0046] Preferably, the top surface of the permeable top plate 52 is also provided with a plurality of weight-reducing holes 57, and the plurality of weight-reducing holes 57 are evenly distributed in the horizontal direction; the weight-reducing holes 57 are filled with gravel with a particle size of 2-4 mm. By providing the weight-reducing holes 57, the mass of the permeable top plate 52 can be reduced, and the transportation and laying of the permeable top plate 52 can be facilitated. At this time, the strength of the permeable top plate 52 is reduced. At this time, the permeable bottom plate 51 is used to cooperate with the permeable top plate 52 to enhance the strength of the entire permeable brick 5 and prevent the permeable top plate 52 from being crushed. During rainfall, rainwater will be stored in the weight-reducing holes 57. After the rainfall stops, the rainwater stored in the weight-reducing holes 57 evaporates into the air, which plays a role in dust prevention and cooling, is green and environmentally friendly, and saves energy. The weight-reducing holes 57 can be blind holes or through holes. When the weight-reducing holes 57 are through holes, they and the top surface of the permeable bottom plate 51 form a space for storing rainwater. In order to facilitate the casting and forming of the permeable top plate 52 , the weight-reducing holes 57 are generally set as through holes.

[0047] Preferably, the permeable roof 52 top surface is sprayed with hydrophobic coating 58, and the contact angle of the hydrophobic coating 58 is greater than or equal to 120 °.Hydrophobic coating 58 is a kind of coating with special surface property, it can make liquid (especially water) form larger contact angle on its surface, thus show good hydrophobic performance, i.e. water drop is difficult to spread on the coating surface, but forms approximately spherical water droplet, and easily rolls off from the surface.By arranging hydrophobic coating 58, the rainwater on its surface flows rapidly into upper permeable hole 521, further improve the drainage efficiency of whole drainage module.Hydrophobic coating 58 can be existing organosilicon hydrophobic coating, fluorocarbon uncle coating or long chain alkane water coating etc., as further preferably, the hydrophobic coating 58 is SiO2 hydrophobic coating, SiO2 hydrophobic coating can realize the super-hydrophobic state that contact angle is greater than 150 °, and water drop is easy to roll off on its surface, possesses self-cleaning ability, further improves the drainage efficiency of whole module.

[0048] The construction method for laying any of the above-mentioned ecological permeable pavement systems comprises the following steps:

[0049] S1. First, clean the construction site, excavate the foundation pit to the specified depth, and then compact the soil at the bottom of the foundation pit to form foundation soil layer 1. After the construction of foundation soil layer 1 is completed, its compaction degree is tested;

[0050] S2. 20-40 mm thick gravel is laid on top of the foundation soil layer 1 and compacted using a flat plate vibrator to form a gravel cushion layer 2; the settlement difference of the gravel cushion layer 2 during the compaction process using the flat plate vibrator is required to be ≤ 2 mm / 3 m;

[0051] S3, laying a mixture of quartz sand and zeolite powder on the gravel cushion layer 2 to form a filter sand layer 3, scraping the filter sand layer 3 flat and spraying a bio-enzyme curing agent, and the curing waiting time of the curing agent is ≤ 2h;

[0052] S4, laying a geotextile 7 on the surface of the filter sand layer 3;

[0053] S5. Lay permeable bricks 5 on top of the geotextile 7. Use a laser locator to assist in the arrangement of the permeable bricks 5. After the permeable bricks 5 are laid, fill the gaps 41 between the permeable bricks 5 with 2-4 mm gravel to form a surface layer 4. The gravel filling rate is required to be ≥95%.

[0054] S6. Insert the anchor bolt 6 into the countersunk hole of the permeable brick 5 and anchor the anchor bolt 6 in the filter sand layer 3. Finally, use epoxy resin to grout the countersunk hole of the permeable brick 5 to fix the anchor bolt; the implantation depth of the anchor bolt 6 is required to be ≥150mm.

[0055] After the construction of step S1 is completed, the compaction degree of the foundation soil layer 1 should be detected by the ring knife method, and the compaction degree of the foundation soil layer 1 is required to be ≥93%. The device for spraying the bio-enzyme curing agent in step S3 promotes the cohesion between the particles of the filter sand layer 3, increases the density of the filter sand layer 3, and improves the water purification efficiency of the filter sand layer 3. The curing waiting time of the curing agent is ≤2h to avoid affecting the permeability of the filter sand layer 3. After the construction of the surface layer 4 in step S5 is completed, it is required to test its parameters such as permeability coefficient, compressive strength and flatness error. The permeability coefficient is required to be ≥8mm / s, the compressive strength is ≥35MPa, and the flatness error is ≤3mm / 2m. The permeable bricks 5 in step S5 are prefabricated in the factory and then transported to the construction site for paving. The surface layer 4 is paved by the dry paving method. After paving, there is no need to use cement or mortar to fix the gaps in the permeable bricks 5. No maintenance is required, which saves time and effort and is convenient for maintenance.

[0056] In the description of the present invention, the terms "upper", "lower", "top", "bottom", "front", "back", "side", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the figures. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationships in the figures are only used for illustrative purposes and cannot be understood as limiting the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0057] The embodiments of this specific implementation method are all preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. An ecological permeable paving system, comprising a foundation soil layer (1), a crushed stone cushion layer (2) and a surface layer (4) arranged in sequence from bottom to top, wherein the surface layer (4) comprises a plurality of permeable bricks (5) laid in a horizontal direction, and the top surfaces of the plurality of permeable bricks (5) are flush; characterized in that: It also includes a filter sand layer (3) arranged between the gravel cushion layer (2) and the surface layer (4), and the filter sand layer (3) is evenly filled with zeolite powder; A filling joint (41) is provided between two adjacent permeable bricks (5), and the filling joint (41) is filled with crushed stone; a countersunk hole perpendicular to the horizontal plane is provided on the permeable brick (5), and an anchor bolt (6) is provided in the countersunk hole, and the permeable brick (5) is anchored to the filter sand layer (3) through the anchor bolt (6); the top surface of the anchor bolt (6) is located in the countersunk hole; the countersunk hole is also filled with an epoxy resin block, and the top surface of the epoxy resin block is flush with the top surface of the permeable brick (5).

2. The ecological permeable paving system according to claim 1, characterized in that: The crushed stone cushion layer (2) is formed by paving a plurality of crushed stones with a particle size of 20-40 mm, and the porosity of the crushed stone cushion layer accounts for more than 40% of its total volume; the thickness of the crushed stone cushion layer (2) is 150 mm; The filter sand layer (3) is paved with a mixture of quartz sand and zeolite powder. The particle size of the quartz sand in the filter sand layer (3) is 0.3-0.6 mm, and the zeolite powder in the filter sand layer (3) accounts for 5% of the total volume of the filter sand layer (3). The thickness of the filter sand layer (3) is above 50 mm.

3. The ecological permeable paving system according to claim 1, characterized in that: A geotextile (7) is laid between the filter sand layer (3) and the surface layer (4).

4. The ecological permeable paving system according to claim 3, characterized in that: The crushed stone filling rate of the filling joint (41) is above 95%, and the crushed stones in the filling joint (41) are gravels with a particle size of 2-4 mm.

5. The ecological permeable pavement system according to any one of claims 1 to 4, characterized in that: The permeable brick (5) comprises a permeable bottom plate (51) and a permeable top plate (52) detachably mounted above the permeable bottom plate (51); the permeable bottom plate (51) is evenly provided with a plurality of lower permeable holes (511) extending vertically through the permeable bottom plate (51); the permeable top plate (52) is evenly provided with a plurality of upper permeable holes (521) extending vertically through the permeable top plate (52); the upper permeable holes (521) and the lower permeable holes (511) are interconnected, and the apertures of both holes are greater than 10 mm.

6. The ecological permeable paving system according to claim 5, characterized in that: The top surface of the permeable bottom plate (51) is provided with an upward convex positioning block (53), and the bottom surface of the permeable top plate (52) is provided with an upward concave positioning groove (54). The cross-sectional outer contour of the positioning block (53) and the cross-sectional outer contour of the positioning groove (54) are adapted in shape and size. The positioning block (53) is inserted into the positioning groove (54). A compression rubber pad (55) is provided between the groove wall of the positioning groove (54) and the side wall of the positioning block (53). The material of the compression rubber pad (55) is EPDM rubber.

7. The ecological permeable paving system according to claim 6, characterized in that: A guide hole (56) connected to the upper water permeable hole (521) is provided on the side wall of the permeable top plate (52), and the guide holes (56) are provided in plurality, and the plurality of guide holes (56) are evenly distributed along the circumference of the permeable top plate (52); the guide holes (56) are arranged obliquely downward from an end away from the upper water permeable hole (521) to an end close to the upper water permeable hole (521).

8. The ecological permeable paving system according to claim 7, characterized in that: The top surface of the permeable top plate (52) is also provided with a plurality of weight-reducing holes (57), and the plurality of weight-reducing holes (57) are evenly distributed in the horizontal direction; the weight-reducing holes (57) are filled with gravel with a particle size of 2-4 mm.

9. The ecological permeable paving system according to claim 8, characterized in that: The top surface of the permeable top plate (52) is sprayed with a hydrophobic coating (58), and the contact angle of the hydrophobic coating (58) is greater than or equal to 120°; The hydrophobic coating (58) is a SiO2 hydrophobic coating.

10. A construction method for laying an ecological permeable pavement system according to any one of claims 1 to 9, characterized in that: The steps include: S1. Clean the construction site, excavate the foundation pit to a specified depth, and then compact the soil at the bottom of the foundation pit to form a foundation soil layer (1). After the construction of the foundation soil layer (1) is completed, its compaction degree is tested; S2. 20-40 mm thick crushed stones are laid on the foundation soil layer (1) and compacted using a flat plate vibrator to form a crushed stone cushion layer (2); the settlement difference of the crushed stone cushion layer (2) during the compaction process using the flat plate vibrator is required to be ≤2 mm / 3 m; S3, laying a mixture of quartz sand and zeolite powder on the gravel cushion layer (2) to form a filter sand layer (3), scraping the filter sand layer (3) flat and spraying it with a bio-enzyme curing agent, and the curing waiting time of the curing agent is ≤2h; S4, laying a geotextile (7) on the surface of the filter sand layer (3); S5, laying permeable bricks (5) on top of the geotextile (7), using a laser positioning device to assist in the arrangement of the permeable bricks (5); after the permeable bricks (5) are laid, filling the filling gaps (41) between the permeable bricks (5) with 2-4 mm gravel to form a surface layer (4); the gravel filling rate is required to be ≥95%; S6. Insert the anchor bolt (6) into the countersunk hole of the permeable brick (5) and anchor the anchor bolt (6) in the filter sand layer (3). Finally, use epoxy resin to fill the countersunk hole of the permeable brick (5) to fix the anchor bolt; the implantation depth of the anchor bolt (6) is required to be ≥150 mm.

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