CN203128970U

CN203128970U - Water permeable road surface capable of purifying rainwater

Info

Publication number: CN203128970U
Application number: CN 201320049570
Authority: CN
Inventors: 肖晶晶; 沙爱民; 蒋玮; 王振军
Original assignee: Changan University
Current assignee: Changan University
Priority date: 2013-01-29
Filing date: 2013-01-29
Publication date: 2013-08-14
Anticipated expiration: 2023-01-29

Abstract

The utility model discloses a permeable road surface capable of purifying rainwater. It includes a geotextile layer, a sand cushion layer laid on the geotextile layer, a graded crushed stone layer laid on the sand cushion layer and a porous surface layer laid on the graded crushed stone layer. By rationally setting pavement materials and structural layers, the pavement can improve the quality of rainwater infiltrated into the soil foundation, thereby reducing the pollution of urban groundwater and realizing the purification of rainwater.

Description

A kind of porous pavement that purifies rainwater

Technical field

The utility model relates to a kind of road surface, is specifically related to a kind of porous pavement that purifies rainwater.

Background technology

In urban construction, most urban road, park, garden and public squares are fluid-tight close-graded concrete and flag paving.Though thisly mat formation simply, with low cost, be unfavorable for rainwater infiltration, replenish urban groundwater, thereby cause the city cone of groundwater phenomenon to occur, the aggravation surface subsidence has brought very big negative effect to urban ecological environment.

Outside in urban road road table, include all kinds of pollutants, comprise solid particle, organic pollution, nitrogen phosphorus nutrition thing etc., these pollutants can flow with rainwater when rainfall, can cause phreatic pollution when these pollutants enter in the soil matrix.

Summary of the invention

Have multiple pollutant at city road table, rainwater infiltrates the phenomenon that soil matrix causes groundwater pollution easily by the road surface, and the purpose of this utility model is to provide a kind of porous pavement that purifies rainwater.

For this reason, the porous pavement of the purified rainwater that provides of the utility model comprises the geotextile layer, is laid on sand cushion on the geotextile layer, is laid on the graded broken stone layer on the sand cushion and is laid on porous friction course on the graded broken stone layer.

Other technologies of the present utility model are characterized as:

Described graded broken stone layer comprises that the graded broken stone that is laid on the sand cushion goes to a grassroots level and be laid on basic unit on the graded broken stone of graded broken stone on going to a grassroots level.

Described porous friction course comprises under the porous that is laid on the graded broken stone layer surface layer and is laid on the porous upper layer on the surface layer under the porous.

The thickness of described sand cushion is 5～10cm.

The thickness that described graded broken stone is gone to a grassroots level is that 15～50cm, void content are 12%～16%.

The thickness of basic unit is 8～12cm on the described graded broken stone, and void content is 8%～15%.

The void content of surface layer is 18%～25% under the described porous.

The void content of described porous upper layer is 18%～25%.

By ground surface material and deck reasonably are set, the rainwater quality of infiltrating soil matrix can be improved in road surface of the present utility model, thereby reduces the pollution to urban groundwater, realizes the catharsis to rainwater.

Description of drawings

Below in conjunction with accompanying drawing and the specific embodiment the utility model is done step detailed description.

Fig. 1 is the permeable pavement structure schematic diagram that can purify rainwater of the present utility model.

The specific embodiment

Each deck of porous pavement has the function of infiltration rainwater, can make the rainwater that drops to the road table infiltrate soil matrix, therefore, from improving the water cycle perspective in city, improves the angle of balance of city ecosystem and sets out, and porous pavement has society and environmental benefit significantly.

Because particle and factors such as other particles relevant with vehicle operating, atmospheric falling dust and deicer that the leakage of tire wear, road materials wearing and tearing, transportation article, brake linkage produce, in the table of urban road road, include all kinds of pollutants, comprise solid particle, organic pollution, heavy metal, nitrogen phosphorus nutrition thing, chloride, grease, agricultural chemicals etc., these pollutants can flow with rainwater when rainfall, when adopting porous pavement, should avoid these pollutants to enter in the soil matrix, cause phreatic pollution.Therefore, can be optimized porous pavement material and textural association, realize that by ground surface material and deck reasonably are set the road surface to infiltrating the filtration, purification of rainwater, guarantees that underground water is not contaminated.Can effectively alleviate the present situation that can not get replenishing after the urban groundwater exploitation by the making porous pavement, because there is multiple pollutant in the road table, can not pollute underground water in order to ensure the rainwater that infiltrates soil matrix, the permeable pavement structure layer material need rationally be set, corresponding effective filtration beds is set simultaneously, thereby makes the rainwater that infiltrates soil matrix clean relatively.

As shown in Figure 1, the porous pavement that purifies rainwater of the present utility model comprises the geotextile layer 6 that is layed on the roadbed and the sand cushion 5 that is layed on the geotextile layer 6, at sand cushion 5 the graded broken stone layer is set, this graded broken stone layer can be the different graded broken stone base of two-layer nominal maximum particle diameter, be respectively the graded broken stone that is laid on the sand cushion 5 and go to a grassroots level 4 and be laid on the graded broken stone basic unit 3 on the graded broken stone on 4 that goes to a grassroots level, lay porous friction course at graded broken stone base, this porous friction course can be the different porous asphalt mixture of two-layer nominal maximum particle diameter or honeycombed cement concrete pavement, and it is respectively under the porous that is laid on the graded broken stone layer surface layer 2 and is laid on the porous upper layer 1 on the surface layer 2 under the porous.

Wherein be layed in the geotextile layer 6 on the soil matrix, its penetrating power is higher, generally in 0.00l～0.lcm/s scope, and can stop the particle in the soil matrix to enter road structure;

Be layed in the sand cushion 5 on the geotextile layer 6, thickness is generally 5～10cm, adopts medium sand or coarse sand making and compacting;

Be layed in graded broken stone base on the sand cushion 5 and be divided into that basic unit 3 and graded broken stone go to a grassroots level 4 on the graded broken stone, graded broken stone goes to a grassroots level 4, and to adopt the nominal maximum particle diameters be the graded broken stone of 26.5～37.5mm, thickness is generally 15～50cm, and void content is about 12%～16%; Basic unit's 3 employing nominal maximum particle diameters are the graded broken stone of 16～20mm on the graded broken stone, and thickness is generally 8～12cm, and void content is 8%～15%;

The porous asphalt mixture or the honeycombed cement concrete pavement that are layed on the graded broken stone base are divided into surface layer 2 under porous upper layer 1 and the porous, surface layer 2 is that the nominal maximum particle diameter is at porous asphalt mixture or the honeycombed cement concrete of 16～25mm under the porous, porous upper layer 1 be the nominal maximum particle diameter at porous asphalt mixture or the honeycombed cement concrete of 5～13mm, surface layer 2 material void rates are 18%～25% under porous upper layer 1 and the porous.

Road surface of the present utility model has taken into full account the filtration to particulate matter when design, be provided with geotextile and sand cushion at the soil matrix end face, this materials at two layers has good filter effect, porous asphalt mixture, honeycombed cement concrete and graded broken stone material with top course in the while sub-surface are porous crack structure, also have certain absorption and filter capacity to infiltrating rainwater, rainwater is by the filtration layer by layer of road surface structare layer, pollutant load when infiltrating soil matrix is less, and is clean relatively.

Embodiment:

According to the technical solution of the utility model, present embodiment provides a kind of porous pavement that can purify rainwater.

The braid that the soil matrix end face laying geotextile layer 6 of this embodiment adopts poly-vinegar class material to make, transmission coefficient 0.007cm/s, sand cushion 5 during geotextile layer 6 end face are laid, thickness 5cm; The graded broken stone that middle sand cushion 5 end face making nominal maximum particle diameters are 31.5mm goes to a grassroots level 4, and its graded broken stone is selected limestone aggregates for use, and void content is 13%, and thickness is 20cm; Go to a grassroots level making nominal maximum particle diameter on 4 of graded broken stone is basic unit 3 on the graded broken stone of 19mm, and its graded broken stone is selected limestone aggregates for use, and void content is 11%, and thickness is 10cm; Basic unit's 3 end face making nominal maximum particle diameters are surface layer 2 under the porous of 16mm on the graded broken stone, it adopts basalt aggregate and high-viscosity modified asphalt preparation, the mixture gap rate is 20%, thickness is 6cm, surface layer 2 end face making nominal maximum particle diameters are the porous upper layer 1 of 10mm under the porous, it adopts basalt aggregate and high-viscosity modified asphalt preparation, and the mixture gap rate is 20%, and making thickness is 4cm.

Adopt road table rainwater by behind this road structure, can filter 70%～80% suspended particulate substance ss and 50%～60% organic pollution COD, the rainwater after the filtration is clean relatively, has realized that porous pavement purifies the function of rainwater.

Claims

1. A permeable pavement that can purify rainwater is characterized in that it comprises a geotextile layer (6), a sand cushion (5) laid on the geotextile layer (6), a sand cushion laid on the sand cushion (5) A layer of graded crushed stone and a porous surface course laid over the layer of graded crushed stone.

2. The permeable pavement capable of purifying rainwater according to claim 1, characterized in that the graded gravel layer comprises a graded gravel subbase (4) laid on the sand cushion (5) and a base layer laid on the The graded crushed stone upper base (3) on the graded crushed stone lower base (4).

3. The permeable pavement capable of purifying rainwater according to claim 1, characterized in that the porous surface layer comprises a porous lower layer (2) laid on the graded gravel layer and a porous lower layer (2) laid on the porous lower layer The upper porous layer (1).

4. The permeable pavement capable of purifying rainwater according to claim 1, characterized in that the thickness of the sand cushion (5) is 5-10 cm.

5. The permeable pavement capable of purifying rainwater according to claim 2, characterized in that, the thickness of the graded crushed stone subbase (4) is 15-50 cm, and the porosity is 12%-16%.

6. The permeable pavement capable of purifying rainwater according to claim 2, characterized in that the upper base (3) of graded gravel has a thickness of 8-12 cm and a porosity of 8%-15%.

7. The permeable pavement capable of purifying rainwater according to claim 3, characterized in that the porosity of the porous lower layer (2) is 18%-25%.

8. The permeable pavement capable of purifying rainwater according to claim 3, characterized in that the porosity of the porous upper layer (1) is 18%-25%.