CN211815290U - Combined permeable landscape sidewalk structure for sponge city - Google Patents
Combined permeable landscape sidewalk structure for sponge city Download PDFInfo
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- CN211815290U CN211815290U CN201922255971.1U CN201922255971U CN211815290U CN 211815290 U CN211815290 U CN 211815290U CN 201922255971 U CN201922255971 U CN 201922255971U CN 211815290 U CN211815290 U CN 211815290U
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Abstract
The utility model provides a combined permeable landscape sidewalk structure for a sponge city, which comprises a main road bed, a green belt, a sidewalk main body and first waterproof geotextile; the sidewalk main body comprises a permeable asphalt upper surface layer, a permeable asphalt lower surface layer, a permeable base layer, a graded broken stone subbase layer, an earth roadbed and second waterproof geotextile; the main road base of the soil roadbed is provided with a downward inclined slope towards the direction of the green belt; the utility model discloses can effectively solve the problem that the rainwater stored up in the permeable pavement structure, improve the durability of permeable pavement structure, provide the rainwater simultaneously for the road green belt and supply with.
Description
The technical field is as follows:
the utility model belongs to the technical field of road engineering, especially, view pavement structure permeates water of combination formula in sponge city.
Background art:
in the urban road construction of China, most roads are paved by impervious materials such as dense-graded asphalt mixture, cement concrete and the like, and the proportion of the impervious ground in some cities exceeds 70 percent. Although the paving process of the waterproof material is mature, the waterproof material brings negative effects to the ecological environment of the city: rainwater cannot directly penetrate through the pavement but is drained through a drainage system, so that the burden of a city drainage system is increased, and underground water cannot be effectively supplemented; the accumulated water on the road surface can not be discharged in time during heavy rainfall, which affects the safety of road driving; the impervious pavement simultaneously aggravates the heat island effect of the city, and is not in accordance with the concept of green development. The concept of the sponge city is to adopt measures such as seepage, stagnation, storage, purification, use, discharge and the like, so that 70% of rainfall is absorbed and utilized on the spot, flood disasters caused by strong rainfall are reduced, the heat island effect of the city is lightened, and the quality of the urban ecological environment is improved.
The construction of sponge city can not leave permeable pavement's paving, and permeable pavement structure generally comprises permeable pavement surface course and permeable pavement basic unit at present, and the surface course mainly adopts permeable asphalt concrete, and the basic unit mainly adopts macropore water steady rubble or permeable concrete. However, the permeable structure adopted by the permeable landscape pavement still has the following problems: rainwater is accumulated in the permeable pavement structure, so that the service life of the permeable pavement is influenced; rainwater is discharged through a drainage facility, so that urban drainage burden is increased invisibly; rainwater infiltration affects the stability of the roadbed, etc. Chinese patent document CN 209162571U (application number: 201821778854.2) is a sponge type permeable pavement structure, after rainwater seeps, the water storage structure in the structural layer absorbs water and stores water, although the water storage function can be achieved to a certain extent, the whole structure of the pavement is damaged by the freeze-thaw action at a lower temperature in winter, and the whole durability of the pavement structure is adversely affected; chinese patent document CN206887696U (application number: 201720596580.4) is a permeable sidewalk for sponge cities, rainwater is discharged through a drainage pipeline, so that not only is the construction cost increased, but also the drainage burden of the cities is increased; chinese patent document CN205874884U (application number: 201620193921.9) is a steel slag permeable pavement structure, rainwater directly seeps down to reach an earth subgrade, which can cause the damage of subgrade water and reduce the service life of the road.
The utility model has the following contents:
the weak point to current permeable structure road surface, the utility model aims to provide an ecological environment-friendly combination formula pavement structure of permeating water provides the greenbelt through collecting the pavement rainwater, not only can discharge surface gathered water fast, for the greenbelt supplies with moisture moreover, buries waterproof geotechnological cloth between main road bed and the pavement, prevents the emergence of road bed water harm phenomenon, has good ecological environment benefit.
Realize the technical scheme of the utility model does:
a combined permeable landscape sidewalk structure of a sponge city comprises a main road bed 8, a green belt 9, a sidewalk main body 7 and first waterproof geotextile 62; the sidewalk main body comprises a permeable asphalt upper surface layer 1, a permeable asphalt lower surface layer 2, a permeable base layer 3, a graded broken stone subbase layer 4, a soil roadbed 5 and a second waterproof geotextile 61; the soil subgrade 5 is inclined downwards from the main road subgrade 8 to the green belt 9; the second waterproof geotextile 61 is arranged between the graded broken stone subbase 4 and the soil roadbed 5; the first waterproof geotextile 62 is vertically arranged between the sidewalk main body 7 and the main roadbed 8, and the embedding depth of the first waterproof geotextile 62 is from the top layer of the roadbed 5 to the top layer of the upper layer.
Preferably, the thickness of the permeable asphalt upper surface layer 1 is 40-60 mm.
Preferably, the porosity of the permeable asphalt upper surface layer 1 is 20-25%.
Preferably, the thickness of the permeable asphalt lower surface layer 2 is 40-60 mm.
Preferably, the porosity of the permeable asphalt lower surface layer 2 is 20-25%.
Preferably, the thickness of the permeable base layer 3 is 15-20 cm.
Preferably, the permeable base layer 3 is permeable concrete or macroporous water-stable macadam.
Preferably, the permeable base layer 3 is permeable concrete, and the porosity is 15% -18%.
Preferably, the permeable base layer 3 is large-pore water-stable macadam, and the porosity is 18% -25%.
Preferably, the graded crushed stone sub-base 4 has a CBR value greater than 100%.
Preferably, the gradient of the soil roadbed 5 is 1: 3.7-1: 1.42.
The bearing ratio (CBR) is also called as California bearing ratio and is firstly proposed by the American California road administration for evaluating the strength indexes of roadbed soil and pavement materials, in recent years, the CBR indexes are listed in 'design specifications of highway subgrade' and 'construction technical specifications of highway subgrade' by referring to the practical conditions at home and abroad and are used as the basis for selecting roadbed fillers, so that the determination of the CBR value has very important significance for the design and construction of the roadbed and pavement of highway engineering; the CBR value is the ratio of the unit pressure when the sample penetration amount reaches 2.5mm or 5mm to the standard load (7MPa or 10.5MP) when the standard crushed stone is pressed into the sample with the same penetration amount, and is expressed by percentage.
The beneficial effects of the utility model
The utility model provides a view pavement structure permeates water of combination formula in sponge city has following advantage:
1. the upper layer 1 of the pervious asphalt and the lower layer 2 of the pervious asphalt have attractive appearance and can prevent the pervious pores from being blocked due to the fact that impurity particles such as large-particle-size soil enter the overall structure of the pervious landscape sidewalk.
2. The basic unit 3 that permeates water can make the rainwater infiltrate down fast, avoids the rainwater in the excessive accumulation of basic unit 3 that permeates water, guarantees the infiltration efficiency of rainwater.
3. The graded broken stone subbase 4 ensures the water permeability efficiency and is beneficial to the stability of the whole structure, and the durability of the whole structure is enhanced.
4. Second waterproof geotextile 61 is laid between the graded broken stone subbase layer 4 and the soil roadbed 5, first waterproof geotextile 62 is buried between the main road roadbed and the sidewalk, the burying depth of the first waterproof geotextile is from the top layer of the soil roadbed 5 to the top layer of the permeable asphalt upper surface layer, the soil roadbed 5 has downward inclined slope from the main road roadbed 8 to the green belt 9, rainwater seeped from the sidewalk flows to the green belt, the rainwater is prevented from directly seeping to the soil roadbed, the roadbed water damage phenomenon is prevented, the rainwater persistence in the pavement structure of the sidewalk is reduced, the damage of freezing and thawing action to the whole structure of the pavement when the temperature is lower in winter is avoided, and the durability of the whole pavement structure is enhanced.
5. The utility model relates to a pavement that permeates water simple structure, the rainwater that oozes down need not pass through drainage pipe, directly flows in the greenbelt, has reduced engineering cost, has alleviateed the drainage burden in city, has also alleviateed the greenbelt maintenance work that waters simultaneously.
Description of the drawings:
fig. 1 is a schematic structural diagram of the present invention.
In the figure: 1. the waterproof pavement comprises a permeable asphalt upper surface layer, a permeable asphalt lower surface layer, a permeable base layer, a graded broken stone subbase layer, a soil roadbed, 61, a second waterproof geotextile, 62, a first waterproof geotextile, 7, a sidewalk main body, 8, a main road roadbed, 9 and a green belt.
The specific implementation mode is as follows:
the technical solution of the present invention is described below with reference to the accompanying drawings, but the scope of protection is not limited thereto.
As shown in fig. 1, a combined permeable landscape sidewalk structure for a sponge city comprises a main roadbed 8, a green belt 9, a sidewalk main body 7 and a first waterproof geotextile 62; the sidewalk main body comprises a permeable asphalt upper surface layer 1, a permeable asphalt lower surface layer 2, a permeable base layer 3, a graded broken stone subbase layer 4, a soil roadbed 5 and a second waterproof geotextile 61; the soil subgrade 5 is inclined downwards from the main road subgrade 8 to the green belt 9; the second waterproof geotextile 61 is arranged between the graded broken stone subbase 4 and the soil roadbed 5; the first waterproof geotextile 62 is vertically arranged between the sidewalk main body 7 and the main roadbed 8, and the embedding depth of the first waterproof geotextile 62 is from the top layer of the roadbed 5 to the top layer of the upper layer.
Preferably, the permeable asphalt upper surface layer 1 is composed of OGFC-10 asphalt mixture, the thickness is 40mm, the porosity is 20.6%, and the water permeability coefficient is 4858ml/min, so as to ensure rapid rainwater seepage.
Preferably, the OGFC-10 asphalt mixture is made of Fe2O3The asphalt consists of discontinuous graded broken stone, mineral powder and decolored asphalt.
Preferably, the graded broken stones in the OGFC-10 asphalt mixture have the following grain sizes: 3-5mm: and (3) removing fine aggregates in a ratio of 5-10mm to 50:40, and controlling the mixing amount of granules of 3-5mm to realize the communication effect of pores with different sizes and increase the water permeability coefficient of the pavement.
Preferably, the permeable asphalt lower surface layer 2 is composed of OGFC-13 asphalt mixture, the thickness is 40mm, the porosity is 20.1%, and the water permeability coefficient is 5123 ml/min.
Preferably, the OGFC-13 asphalt mixture consists of discontinuous graded crushed stones, machine-made sand, mineral powder and modified asphalt,
preferably, the graded broken stones in the OGFC-13 asphalt mixture have the following particle sizes:
the particle size mixing ratio of the crushed stone is obtained by taking the drainage performance and the pavement performance as design indexes and taking the ratio of 3-5mm to 5-10mm to 10-15mm to 39:45: 16.
The good drainage function, the needs that need keep the mixture space and gather materials and inlay the realization of crowded structure, avoid inlaying crowded structure contact point breakage and cause the intensity to reduce.
Preferably, the modified asphalt in the OGFC-13 asphalt mixture is SBS modified asphalt.
Preferably, the permeable base layer 3 is a permeable concrete base layer with a thickness of 16 cm.
Preferably, the compressive strength of the pervious concrete base layer 28d is 22.3MPa, the breaking strength is 3.6MPa, the porosity is 18%, and the permeability coefficient is 1.63 mm/s.
Preferably, the aggregate grading of the pervious concrete base layer is that the particle size of broken stones is as follows: 5-10mm: 10-20mm ═ 25:75
The pervious concrete is selected in consideration of the balance point between the pervious and strength, and the coarse aggregates can be mutually embedded and extruded to rub in the proportion, so that the framework strength of the mixture is improved, and the porosity of the mixture is ensured.
Preferably, the CBR of said graded crushed stone sub-base 42.5The value was 124%.
Preferably, the graded broken stone subbase 4 is made of broken stones with the grain sizes: 5-10mm: 10-20 mm: 20-30mm 54:30: 16.
Proper mineral aggregate porosity is obtained by adjusting the proportion of aggregates at all levels, and large porosity and water permeability are ensured while the CBR value meets the design requirement.
The upper layer 1 of the pervious asphalt and the lower layer 2 of the pervious asphalt have attractive appearance and can prevent foreign particles such as large-particle-size soil from entering the overall structure of the pervious landscape sidewalk to block the pervious pores; the permeable base layer 3 can rapidly permeate rainwater downwards; the graded broken stone subbase 4 ensures the stability of the whole permeable structure.
Preferably, the gradient of the soil roadbed 5 is 1: 3.7.
Claims (8)
1. A combined permeable landscape sidewalk structure of a sponge city comprises a main road subgrade (8) and a green belt (9), and is characterized by further comprising a sidewalk main body and first waterproof geotextile (62), wherein the sidewalk main body comprises a permeable asphalt upper surface layer (1), a permeable asphalt lower surface layer (2), a permeable base layer (3), a graded broken stone subbase layer (4), an earth subgrade (5) and second waterproof geotextile (61); the soil subgrade (5) is inclined downwards from the main road subgrade (8) to the green belt (9); the second waterproof geotextile (61) is arranged between the graded broken stone subbase (4) and the soil roadbed (5); the first waterproof geotextile (62) is vertically arranged between the sidewalk main body (7) and the main roadbed (8), and the embedding depth of the first waterproof geotextile (62) is from the top layer of the roadbed (5) to the top layer of the upper surface layer.
2. The permeable landscape sidewalk structure according to claim 1, wherein the permeable asphalt upper surface layer (1) has a thickness of 40-60 mm, and the permeable asphalt lower surface layer (2) has a thickness of 40-60 mm.
3. The permeable landscape sidewalk structure according to claim 1 or 2, wherein the permeable asphalt upper layer (1) has a porosity of 20-25%; the porosity of the permeable asphalt lower surface layer (2) is 20-25%.
4. The permeable landscape sidewalk structure according to claim 1, wherein the permeable base layer (3) has a thickness of 15-20 cm.
5. The permeable landscape sidewalk structure according to any one of claims 1, 2 and 4, wherein the permeable base layer (3) is permeable concrete and has a porosity of 15-18%.
6. The permeable landscape sidewalk structure according to any one of claims 1, 2 and 4, wherein the permeable base layer (3) is large-pore water-stable macadam with a porosity of 18-25%.
7. The water-permeable landscape walkway structure of claim 1, wherein the graded crushed stone underlayment (4) has a CBR value greater than 100%.
8. The permeable landscape sidewalk structure according to any one of claims 1, 2, 4 and 7, wherein the slope of the soil roadbed (5) is 1: 3.7-1: 1.42.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922255971.1U CN211815290U (en) | 2019-12-16 | 2019-12-16 | Combined permeable landscape sidewalk structure for sponge city |
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| CN201922255971.1U CN211815290U (en) | 2019-12-16 | 2019-12-16 | Combined permeable landscape sidewalk structure for sponge city |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112939518A (en) * | 2021-01-27 | 2021-06-11 | 邢台路桥建设总公司 | Pavement structure adhesive, porous concrete base layer and permeable pavement |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112939518A (en) * | 2021-01-27 | 2021-06-11 | 邢台路桥建设总公司 | Pavement structure adhesive, porous concrete base layer and permeable pavement |
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