Asphalt pavement structure capable of draining water

Abstract

The utility model belongs to the technical field of road engineering, and particularly relates to an asphalt pavement structure capable of draining water. According to the pavement structure, the permeable asphalt concrete surface layer is matched with facilities such as the permeable cement concrete curb backrest, the open curbs and the permeable blind pipes, so that the problem of water accumulation on the pavement and the roadside can be effectively solved. According to the pavement structure, accumulated water flows into the pavement edge in time by raising the cross slope of the road, most rainwater flows into the rainwater collecting well through the open curb, and the remaining accumulated water rapidly seeps downwards to be converged into the permeable blind pipe through the permeable structure on the pavement edge and is discharged into the rainwater collecting well along with the permeable blind pipe. The modified emulsified asphalt waterproof layer and the impermeable film are arranged between the permeable structure and the common road base to prevent rainwater from permeating into the road base, and the stability, durability and waterproof performance of the road are improved. The pavement structure has a remarkable effect on discharging accumulated water between the pavement of the road and the rainwater collecting port after the rain in the urban road.

Description

Technical Field

[0001] The utility model relates to a drainage asphalt pavement structure, belongs to the technical field of road engineering, and specifically is an asphalt pavement structure. Background Art

[0002] With the continuous progress of society and economic development, asphalt pavement structure has become the most important pavement structure form in urban roads. Urban asphalt road drainage mainly adopts the method of pavement drainage as the main method and pipeline drainage as the auxiliary method. However, the current urban built-up areas generally have small terrain undulations, the roads in urban areas are relatively flat, and the vertical longitudinal slope of the roads is small. The pavement longitudinal slope drainage cannot meet the drainage needs of urban roads, and it is necessary to rely on rainwater pipes for drainage. Since rainwater pipe drainage requires rainwater collection wells to be set up at certain intervals on the side of the road, affected by errors during road construction, water often accumulates between the rainwater collection outlets on the side of the road after heavy rain, and cannot be discharged smoothly from the rainwater outlets. This part of the accumulated water must be cleaned manually, which greatly increases the labor burden. The utility model adopts a permeable asphalt concrete surface layer, combined with permeable cement concrete curb backs, open curbs and permeable blind pipes and other facilities, which can effectively solve the problem of water accumulation on the road surface and roadside, and improve vehicle driving safety. Summary of the Invention

[0003] The utility model is a new type of permeable asphalt pavement structure for urban roads. It has a significant effect on the problem of water accumulation between the road surface and rainwater collection outlets in rainy areas in urban roads in summer. It can reduce road surface water accumulation, improve vehicle driving comfort, reduce driving noise, reduce the risk of car hydroplaning, reduce the burden of manual cleaning, and improve road driving safety.

[0004] The technical solution adopted by the utility model to solve its technical problems is:

[0005] The pavement structure is set up from top to bottom in sequence: the asphalt top layer (1) is 4cm thick PAC-13 permeable asphalt concrete, the modified emulsified asphalt tack layer (2) is 1L / m 2 The modified emulsified asphalt, the asphalt middle surface layer (3) is 6cm thick AC-16C medium-grained asphalt concrete, and the emulsified asphalt adhesive layer (4) is 0.5L / m 2 The asphalt bottom layer (5) is 8cm thick AC-25C coarse-grained asphalt concrete, the lower seal layer (6) is 6mm thick ES-2 type slurry seal, and the emulsified asphalt penetration layer (7) is 1L / m 2 The upper base (8) is 18 cm thick cement stabilized gravel, the lower base (9) is 18 cm thick cement stabilized gravel, the subbase (10) is 18 cm thick graded gravel, and the subbase (10) is a soil roadbed (11).

[0006] The curbstone (13) provided at the edge of the road surface is a granite curbstone, 1 meter long, 20 cm wide, and 38 cm high. A curbstone opening (1301) is provided on the curbstone (13) to ensure that most rainwater flows from the road surface to the rainwater collection well (18). Cement mortar (14) is provided under the curbstone (13). The cement mortar (14) is made of M10 cement mortar and is 2 cm thick. The curbstone (13) is fixed by a permeable cement concrete backrest (12). The permeable cement concrete backrest (12) is made of C20 permeable cement concrete. A transverse permeable blind pipe (16) and a longitudinal permeable blind pipe (17) are provided in the permeable cement concrete backrest (12). The transverse permeable blind pipe (16) and the longitudinal permeable blind pipe (17) are both made of HDPE material and have holes on the pipes. The longitudinal permeable blind pipe (17) collects rainwater infiltrating from the road side into the transverse permeable blind pipe (16), and uniformly flows into the rainwater collection well (18) set in the green belt. The transverse permeable blind pipe (16) is set with a 2% slope, sloping towards the rainwater collection well (18) to facilitate drainage.

[0007] In order to reduce the risk of reflective cracks caused by uneven settlement of the asphalt surface layer between different structures, a glass fiber geogrid (15) is provided on the top surface between the upper base layer (8) and the permeable cement concrete backrest (12).

[0008] In order to ensure that rainwater in the permeable pavement structure does not penetrate into the road base, an anti-seepage membrane (19) is provided between the permeable structure layer and the lower base (8), the lower base (9) and the subbase (10), and the anti-seepage membrane (19) adopts two cloths and one membrane.

[0009] The asphalt top layer (1) adopts PAC-13 permeable asphalt concrete with a porosity between 15% and 25%. The surface layer structure has strong permeability. The asphalt adopts SBS polymer modified asphalt SBS ID. The modified asphalt base asphalt used adopts No. 70 road petroleum asphalt to ensure the strength, adhesion and durability between the aggregate and the mixture.

[0010] The modified emulsified asphalt tack layer (2) provided between the asphalt upper layer (1) and the asphalt middle layer (3) serves as a waterproof bonding layer, ensuring that rainwater infiltrating from the road surface through the asphalt upper layer (1) cannot enter the asphalt middle layer (3), the asphalt lower layer (5) and the road base, and at the same time having a certain bonding effect, ensuring that the asphalt upper layer (1) and the asphalt lower layer (3) are bonded into a whole. The amount of the modified emulsified asphalt tack layer (2) is 1L / m 2 .

[0011] In order to ensure transverse drainage of the road, the transverse slope of the road is set to 2%. During rainfall, most of the rainwater flows into the rainwater collection well (18) through the road transverse slope and the curb opening (1301). A small amount of road water penetrates into the pavement structure from the asphalt upper layer (1), flows along the modified emulsified asphalt adhesive layer (2) through the road transverse slope and is discharged into the roadside permeable structure, and flows into the rainwater collection well (18) in the green facility belt through the transverse permeable blind pipe (16) and the longitudinal permeable blind pipe (17) set in the permeable cement concrete backrest (12).

[0012] The emulsified asphalt adhesive layer (4) provided between the asphalt middle surface layer (3) and the asphalt lower layer (5) can effectively improve the adhesion between the asphalt middle surface layer (3) and the asphalt lower layer (5), and at the same time has a certain waterproof performance.

[0013] A lower seal layer (6) and an emulsified asphalt permeable layer (7) are provided between the asphalt lower layer (5) and the upper base layer (8). The lower seal layer (6) is a 6mm ES-2 type slurry seal layer. The slurry seal layer can further improve the waterproof performance of the asphalt surface layer and ensure that the base layer is not eroded by rainwater when soaked in rainwater. The emulsified asphalt permeable layer (7) needs to penetrate into the upper base layer (8) by at least 5mm, which can effectively ensure the connection between the asphalt lower layer (5) and the upper base layer (8).

[0014] The permeable cement concrete backrest (12) and the upper base (8) are made of different materials. In order to reduce the risk of reflective cracks in the asphalt surface layer between the base layers of different materials, a glass fiber geogrid (15) is provided on the top surface where the upper base (8) and the permeable cement concrete backrest (12) meet. The glass fiber geogrid (15) is made of glass fiber, has high strength, high deformation resistance and tensile strength, and high thermal stability, and can effectively reduce reflective cracks in the asphalt surface layer. The alkali metal oxide content in the glass fiber geogrid (15) should not be greater than 0.8%, and the mesh shape is rectangular with a size of 20x20mm.

[0015] The coarse aggregate in the asphalt upper layer (1), the asphalt lower layer (3), and the asphalt lower layer (5) is all basalt. As a material used in asphalt pavement structure, basalt has excellent rutting resistance, reasonable gradation, and good durability. The fine aggregate is all manufactured sand.

[0016] The lower seal layer (6) adopts ES-2 type slurry seal layer with ordinary emulsified asphalt as binder, and the aggregate adopts hard, rough, wear-resistant and clean crushed stone.

[0017] The compaction degree of the asphalt upper layer (1) and the asphalt middle layer (3) should be greater than or equal to 98%, the compaction degree of the asphalt lower layer (5) should be greater than or equal to 97%, the compaction degree of the cement-stabilized crushed stone of the upper base (8) should be greater than or equal to 98%, and the compaction degree of the cement-stabilized crushed stone of the lower base (9) should be greater than or equal to 97%. The compaction degree of the graded crushed stone of the subbase (10) should be greater than or equal to 96%. The top surface rebound modulus of the soil roadbed (11) should be greater than or equal to 50 MPa.

[0018] The cement used for the cement-stabilized crushed stone in the upper base (8) and the lower base (9) is P·S32.5 slag silicate cement, and the cement dosage is preferably 5% (the laboratory mix ratio shall prevail during construction). The maximum particle size of the aggregate is not greater than 19 mm, and the maximum crushing value of the aggregate is not greater than 26%.

[0019] The transverse permeable blind pipe (16) and the longitudinal permeable blind pipe (17) are both made of HDPE, with a pipe diameter of not less than DN110 and a wall thickness of not less than 6 mm. They have excellent drainage, pressure resistance, and corrosion resistance, and are easy to construct. The permeable blind pipe can effectively collect the accumulated water in the pavement structure and promptly guide the accumulated water into the rainwater collection well (18). The transverse permeable blind pipe (16) is connected to the rainwater collection well (18), and a 1% horizontal slope is set to facilitate drainage. The setting position and number are consistent with the position and number of the rainwater collection well (18). The rainwater collection well (18) is used to collect rainwater and is set at a spacing of 30 meters. The longitudinal permeable blind pipe (17) is set along the road to collect rainwater in the structural layer into the transverse permeable blind pipe (16).

[0020] The anti-seepage membrane (19) can effectively prevent rainwater from penetrating into the pavement structure from the permeable structure. The anti-seepage membrane (19) adopts a two-cloth-one-film anti-seepage geomembrane with a breaking strength of not less than 7.5KN / m, a CBR bursting strength of not less than 1.5KN, a hydrostatic pressure resistance of 0.4MPa, and a membrane thickness of not less than 0.3mm.

[0021] The curb (13) is provided with a curb opening (1301) for draining rainwater from the road surface. The curb (13) is made of granite to ensure the overall appearance of the road. The curb opening (1301) is 10 cm high and 70 cm long.

[0022] The 25 cm wide asphalt surface layer on the inner side of the curb (13) is made of PAC-13 permeable asphalt concrete. While ensuring that there is no water accumulation at the edge of the road surface, the overlapping position of the asphalt surface layer is controlled as much as possible not to be on the wheel track line.

[0023] The utility model can effectively reduce road surface water accumulation after rainfall and improve vehicle driving safety by coordinating the use of a permeable pavement structure with permeable blind pipes and traditional drainage facilities. At the same time, modified emulsified asphalt, anti-seepage membrane and other waterproof structures are used in the road structure to protect the roadbed to a certain extent, thereby improving the water stability and durability of the road. In addition, according to different base layers, glass fiber geogrids are set in some positions on the bottom surface of the asphalt surface layer according to actual use needs, thereby improving the bearing capacity of the base layer and reducing reflective cracks in the asphalt pavement.

[0024] Advantages and innovations of this utility model:

[0025] 1. This pavement structure is suitable for areas in urban roads where water accumulation on the roadside is serious. It can effectively drain water on the road surface and on the roadside, reducing the workload of manual water sweeping. The pavement structure materials used are all commonly used building materials in road construction.

[0026] 2. The use of PAC-13 permeable asphalt concrete can effectively improve the permeability of the road surface and ensure that there is no water accumulation on the road surface.

[0027] 3. A modified emulsified asphalt tack layer (2) is provided under the asphalt upper layer (1) to allow rainwater that penetrates from the asphalt upper layer (1) to be discharged to the road side through the modified emulsified asphalt tack layer (2), thereby ensuring that no water accumulates on the road surface.

[0028] 4. To ensure smooth drainage of the road’s cross slope, the road’s cross slope is set at 2%.

[0029] 5. The pavement structure adopts ES-2 slurry seal to further improve the waterproof performance of the road base.

[0030] 6. A glass fiber geogrid (15) is set on the permeable cement concrete backrest (12) at the edge of the road and the top surface of the cement-stabilized crushed stone to reduce the reflective cracks of the asphalt surface layer and improve the road's anti-rutting ability.

[0031] 7. The asphalt in permeable asphalt concrete uses polymer modified asphalt SBS ID, and basalt is used as coarse aggregate, which improves the wear resistance of the road, increases the adhesion of asphalt concrete, and improves the durability of the road.

[0032] 8. 25cm wide permeable structures are installed on the roadside to ensure timely drainage of surface water. Longitudinal and transverse permeable blind pipes are installed in the permeable cement concrete to collect rainwater that seeps from the road surface and drain it into rainwater collection wells.

[0033] 9. An anti-seepage membrane (19) is installed between the permeable road surface structure and the traditional road base to ensure that seepage water does not enter the road structure and prevent adverse effects on the road structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solution of the present invention, a brief introduction to the drawings used in the description is given below.

[0035] Figure 1 It is a drainable asphalt pavement structure.

[0036] Reference numerals:

[0037] 1 - Asphalt top layer (4cm thick PAC-13 permeable asphalt concrete)

[0038] 2——Modified emulsified asphalt tack coat (1L / m 2 Modified emulsified asphalt)

[0039] 3 - Asphalt middle surface layer (6cm thick AC-16C medium-grained asphalt concrete)

[0040] 4——Emulsified asphalt tack coat (0.5L / m 2 PC-3 emulsified asphalt)

[0041] 5 - Asphalt sublayer (8cm thick AC-25C coarse-grained asphalt concrete)

[0042] 6——Lower seal layer (6mm thick ES-2 type slurry seal layer)

[0043] 7——Emulsified asphalt penetration layer (1L / m 2 PC-2 emulsified asphalt)

[0044] 8——Upper base (18cm thick cement-stabilized gravel)

[0045] 9——Subbase (18cm thick cement-stabilized gravel)

[0046] 10——Subbase (18cm thick graded gravel)

[0047] 11——Earth roadbed.

[0048] 12——Permeable cement concrete backrest (C20 permeable cement concrete)

[0049] 13 - Curbstone (Granite Curbstone)

[0050] 1301 - Curb opening

[0051] 14——Cement mortar (M10 cement mortar)

[0052] 15——Fiberglass geogrid

[0053] 16——Horizontal permeable blind pipe

[0054] 17——Longitudinal permeable blind pipe

[0055] 18——Rainwater collection well

[0056] 19——Impermeable membrane (two cloths and one membrane) DETAILED DESCRIPTION

[0057] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings and specific embodiments. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0058] An embodiment of the utility model provides a drainage asphalt pavement structure.

[0059] In the description of this application, the terms "upper", "lower", "between", "top" and "bottom" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description.

[0060] The embodiment of the utility model is used for the construction or reconstruction of the road surface structure of an urban road. After the laying of pipelines under the urban road is completed, the soil roadbed (11) is leveled and compacted. The soil roadbed (11) should reserve a 2% transverse slope, slope towards the edge of the road, and ensure that the top surface rebound modulus is not less than 50Mpa.

[0061] After the soil roadbed (11) is treated, the anti-seepage membrane (19) is laid at the edge, and at the same time, an 18cm thick graded crushed stone is laid on the subbase (10). The anti-seepage membrane (19) should be pressed into the subbase (10) by at least 50cm. The graded crushed stone used in the subbase (10) is made by mixing and mixing several kinds of crushed stones and stone chips with different particle sizes. The crushing value is not more than 26%, and the compaction degree is not less than 96%. During construction, a heavy-duty vibratory roller of not less than 18t is used to roll the roadbed at a speed of less than 4km / h with strong vibration. After rolling twice, the elevation difference of each measuring point is measured. The average value should be no more than 5mm, and the standard deviation should be no more than 3mm.

[0062] After the subbase (10) is paved with graded crushed stone, the lower base (9) with a thickness of 18 cm cement-stabilized crushed stone and the upper base (8) with a thickness of 18 cm cement-stabilized crushed stone are paved in sequence. The compaction degree of the lower base (9) should be no less than 97%, and the compaction degree of the upper base (8) should be no less than 98%. The upper base (8) should be paved after the lower base (9) is paved and watered for at least 7 days before paving.

[0063] The width of the upper base layer (8) should be 25 cm away from the edge of the curb (13). The anti-seepage membrane (19) should be compacted layer by layer to the edge of the upper base layer (8). After the paving is completed, when the compacted surface is slightly dry, the emulsified asphalt penetration layer (7) should be spread in time. The dosage is 1 L / m 2 The emulsified asphalt layer (7) penetrates into the upper base layer (8) to a thickness of not less than 5 mm. After the construction of the emulsified asphalt layer (8) is completed, traffic should be closed and the next construction should be carried out after maintenance for not less than 7 days.

[0064] After the upper base (8) is cured, the formwork is supported and the permeable cement concrete backrest (12) is poured. Before pouring, the transverse permeable blind pipe (16) and the longitudinal permeable blind pipe (17) are installed. The longitudinal permeable blind pipe (17) is connected to the transverse permeable blind pipe (16). The transverse permeable blind pipe (16) should be set with a transverse slope of at least 1% when installed. After the permeable cement concrete backrest (12) is poured and cured for 7 days, the glass fiber geogrid (15) is laid on the top surface of the junction with the upper base (8). When laying the glass fiber geogrid (15), one end should be fixed with a fixer, and after mechanical and manual tensioning, the other end should be fixed with a fixer. The tensioning elongation should be controlled within 1.0% to 1.5%.

[0065] After the glass fiber geogrid (15) is completed, the lower seal layer (6) 6mm thick ES-2 type slurry seal is laid. The lower seal layer (6) uses ordinary emulsified asphalt as a binder, and the aggregate is hard, rough, wear-resistant, and clean gravel.

[0066] After the construction of the lower sealing layer (6) is completed, the lower layer (5) of 8 cm thick AC-25C coarse-grained asphalt concrete is paved. The paver should spread the concrete slowly, evenly, continuously and uninterruptedly.

[0067] After the lower layer (5) is paved, the emulsified asphalt tack coat (4) is spread at a dosage of 0.5 L / m 2 After the emulsified asphalt PC-3 is spread, the traffic is immediately closed. After the asphalt is demulsified, the middle surface layer (3) of 6 cm thick AC-16C medium-grained asphalt concrete is laid.

[0068] After the middle surface layer (3) is paved and rolled, the curbstone (13) is installed. The curbstone (13) located at the position of the rainwater collection well (18) should be provided with a curbstone opening (1301) in advance. The curbstones (13) at other positions are not provided with openings. The curbstone opening (1301) is 70 cm long and 10 cm high and is used for road drainage.

[0069] After all the curbstones (13) are installed, the sides of the curbstones (13) and the edges of the middle layer (3) and the lower layer (5) should be sprinkled with the modified emulsified asphalt (2) at a rate of 1 L / m 2 After the spreading is completed, the traffic is closed. After the asphalt is demulsified, the asphalt top layer (1) PAC-13 permeable asphalt concrete is spread. After compaction, the road is marked and traffic is opened.

Claims

1. A drainable asphalt pavement structure, characterized by: The pavement structure includes, from top to bottom, an asphalt upper layer (1), a modified emulsified asphalt tack coat (2), an asphalt middle layer (3), an emulsified asphalt tack coat (4), an asphalt lower layer (5), a lower seal coat (6), an emulsified asphalt permeable coat (7), an upper base layer (8), a lower base layer (9), a subbase layer (10), and a soil roadbed (11). A curb (13) is provided at the edge of the pavement. A curb opening (1301) is provided on the curb (13) to ensure that accumulated water flows out of the pavement. Cement mortar (14) is provided under the curb (13). The curb (13) is filled with permeable cement mortar. The concrete backrest (12) is fixed, and a transverse permeable blind pipe (16) and a longitudinal permeable blind pipe (17) are arranged in the permeable cement concrete backrest (12). The longitudinal permeable blind pipe (17) collects rainwater that penetrates from the road structure to the transverse permeable blind pipe (16), and uniformly flows into the rainwater collection well (18) arranged in the green belt. A glass fiber geogrid (15) is arranged between the upper base layer (8) and the permeable cement concrete backrest (12), and an anti-seepage membrane (19) is arranged between the permeable structure layer and the upper base layer (8), the lower base layer (9) and the bottom base layer (10).

2. The drainable asphalt pavement structure according to claim 1, characterized in that: The asphalt upper layer (1) is made of PAC-13 permeable asphalt concrete, and the asphalt surface layer with a width of 25 cm inside the curb (13) is made of PAC-13 permeable asphalt concrete as a whole, ensuring that no water accumulates at the edge of the road surface and that the overlapping position of the asphalt surface layer is controlled as much as possible not to be on the wheel track line.

3. The drainable asphalt pavement structure according to claim 1, characterized in that: The asphalt top layer (1) is 4 cm thick PAC-13 permeable asphalt concrete, and the modified emulsified asphalt tack coat (2) is used in an amount of 1 L / m 2 The modified emulsified asphalt, the asphalt middle surface layer (3) is 6cm thick AC-16C medium-grained asphalt concrete, and the emulsified asphalt adhesive layer (4) is used in an amount of 0.5L / m 2 The PC-3 emulsified asphalt, the asphalt bottom layer (5) is 8cm thick AC-25C coarse-grained asphalt concrete, the lower seal layer (6) is 6mm thick ES-2 type slurry seal, the emulsified asphalt penetration layer (7) is used in an amount of 1L / m 2 PC-2 emulsified asphalt, the upper base (8) and the lower base (9) are both made of 18 cm thick cement stabilized gravel, the permeable cement concrete backrest (12) is made of C20 permeable cement concrete, the curb (13) is a granite curb, the transverse permeable blind pipe (16) and the longitudinal permeable blind pipe (17) are both made of DN110 HDPE pipe, the glass fiber geogrid (15) is alkali-free glass fiber, and the anti-seepage membrane (19) is two cloths and one membrane.

4. The drainable asphalt pavement structure according to claim 1, characterized in that: The asphalt in the permeable asphalt concrete of the asphalt top layer (1) is polymer modified asphalt SBS ID, and the aggregate is open-graded aggregate to ensure permeability.

5. The drainable asphalt pavement structure according to claim 1, characterized in that: The asphalt upper layer (1) and the permeable cement concrete backrest (12) are both made of permeable materials, and the anti-seepage membrane (19) is arranged between the permeable structure and the ordinary structure to ensure the stability of the road surface structure.

6. The drainable asphalt pavement structure according to claim 1, characterized in that: Glass fiber geogrids are installed on the top surface of different base layer joints to reduce reflective cracks in the asphalt surface layer.

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