CN110453565A - A road rainwater collection system for a sponge city - Google Patents

Abstract

The invention provides a road rainwater collection system for a sponge city and relates to the field of road construction. The road rainwater collection system of the sponge city includes the road permeable layer and the road base layer arranged in sequence from top to bottom. There is a waterproof seal layer between the road permeable layer and the road base layer. There are drainage channels on both sides of the waterproof seal layer. The channel extends along the length of the road, and an underground water storage structure is provided on the outside of the road base; overflow channels are respectively provided on both sides of the road permeable layer, and the overflow channel connects the space above the upper surface of the road permeable layer, and the drainage channels are respectively connected to the waterproof seal The space above the upper surface of the layer is connected with the overflow channel, so as to receive and confluence the rainwater from the infiltration of the road surface and the flood water on the road surface. The drainage channels can collect infiltrating rainwater and road flooding, and discharge them uniformly into the underground water storage structure. The simple underground structure can reduce construction costs; the underground water storage structure is located on the outside of the road to ensure the stability and firmness of the road foundation and prevent road surface subsidence. question.

Description

A road rainwater collection system for a sponge city

technical field

The invention relates to the technical field of road construction, in particular to a road rainwater collection system for a sponge city.

Background technique

In cities, roads are important infrastructure, and urban roads are usually paved with asphalt pavement, which has the characteristics of good flatness, durability and impermeability. Among them, impermeability is both an advantage and a disadvantage of asphalt pavement. On the one hand, it ensures that the roadbed will not be eroded by excessive rainwater and collapse; Absorbed and stored by the urban surface, water resources cannot be rationally utilized.

With the proposal of the concept of sponge city, the construction of roads with rainwater collection function has become one of the development directions. For example, the Chinese utility model patent with the authorized announcement number CN206529670U and the authorized announcement date of 2017.09.29 discloses a road drainage system for sponge cities, and specifically discloses that the road drainage system includes permeable pavement and curbs arranged on both sides of the permeable road surface The diversion channel, the permeable road surface is provided with a purification layer, the purification layer is connected to the first reservoir, the first reservoir is connected to the first overflow pipe and the first water pipe, and the curb diversion channel is connected to the second reservoir The side of the curb diversion channel away from the permeable road surface is provided with a vegetation filter layer, the second reservoir is provided with a second water pipe and a second overflow pipe connected to the upper end of the vegetation filter layer; the bottom of the vegetation filter layer is provided with the second A water-permeable layer connected to a reservoir. Wherein, the purification layer includes a ceramsite layer, a fine sand layer and an activated carbon layer arranged sequentially from top to bottom, and the first reservoir is arranged below the activated carbon layer.

When encountering the climate conditions of heavy rainfall, part of the rainwater on the road surface will enter the first reservoir through the permeable road surface and the purification layer, while another part of the rainwater will enter the first reservoir through the drainage pipe from the curb diversion channel. In the second storage tank, road surface rainwater is collected through the first storage tank and the second storage tank. However, setting the first water storage tank directly under the fully permeable road surface cannot guarantee sufficient stable support for the road. After long-term rolling and use, the road surface may collapse; The pool is used to collect rainwater discharged from the curb diversion channel, which increases the structural complexity and construction cost of the entire road system.

Contents of the invention

In order to solve the above-mentioned problems, the object of the present invention is to provide a road rainwater collection system for sponge city, so as to solve the problems that the road surface of the road system in the prior art may collapse, and the structure is complicated and the construction cost is high.

The technical scheme of the road rainwater collection system of the sponge city of the present invention is:

The road rainwater collection system of the sponge city includes a road permeable layer and a road base layer arranged sequentially from top to bottom, and a waterproof sealing layer is interposed between the road permeable layer and the road base layer, and the waterproof sealing layer is located on two sides of the road in the width direction. The sides are respectively provided with drainage channels, and the drainage channels are arranged along the length of the road, and the outer side of the road base is provided with an underground water storage structure connected with the drainage channels;

The road permeable layer is located on both sides of the road width direction and is respectively provided with overflow channels. The space communicates with the overflow channel.

Beneficial effects: The road rainwater collection system adopts the structure of the road permeable layer, the road base and the waterproof seal layer. The upper surface of the road permeable layer is the road surface. The infiltrating rainwater is diverted to the drainage channel through the waterproof seal layer; if there is heavy rainfall and the seepage speed of the road permeable layer is not enough to drain the rainwater, the overflow channel on both sides of the road can be directly drained to the drainage channel. Drainage channel, the drainage channel can collect infiltrating rainwater and road overflow, and discharge it uniformly into the underground water storage structure, reducing the construction quantity and engineering quantity of the underground water storage structure, and the simple underground structure can reduce the construction difficulty and construction cost; and , the underground water storage structure is located on the outside of the road base, which ensures the stability and firmness of the entire road foundation, avoids placing the underground water storage structure directly below the road and causing the road to be in a suspended state, and prevents the road from appearing after long-term rolling and use. The problem of road subsidence.

Further, in order to ensure that infiltrated rainwater can completely enter the drainage channel, the drainage channel is a drainage ditch, and the waterproof sealing layer is located on both sides of the road width direction and extends to the inner wall of the drainage ditch on one side near the center of the waterproof sealing layer .

Further, in order to improve the diversion effect of the waterproof sealing layer on infiltrating rainwater, the upper surface of the waterproof sealing layer is an arched surface along the width direction of the road, which is high in the middle and low on both sides.

Further, in order to ensure the waterproofness of the waterproof sealing layer, the waterproof sealing layer is an emulsified asphalt slurry sealing layer.

Further, in order to take into account the water permeability and skid resistance of the road permeable layer, the road permeable layer includes a water-permeable anti-skid layer and a water-permeable filter layer, and the water-permeable filter layer is located on the lower side of the water-permeable anti-skid layer; the water-permeable anti-skid layer is made of OGFC The water-permeable filter layer is a concrete layer with voids.

Further, in order to satisfy the abrasion resistance of the water-permeable anti-skid layer, the thickness of the water-permeable anti-skid layer is 2 cm to 10 cm.

Further, in order to ensure the structural strength of the concrete layer, the thickness of the concrete layer is 10cm to 30cm.

Further, in order to reduce the cost of road construction, the road base is a cement stabilized gravel base.

Further, in order to prevent the road from flooding to the outside of the road, the road permeable layer is respectively provided with curb stones on both sides of the road width direction. The entrance is opened on the side wall of the curb close to the road surface.

Further, in order to quickly and effectively remove sand from the flooded road directly discharged through the overflow channel, a grit chamber is provided at the overflow outlet of the drainage ditch near the overflow channel.

Further, in order to ensure the cleanliness of the rainwater stored in the underground water storage structure, the underground water storage structure is arranged below the drainage ditch, and the interior of the underground water storage structure is provided with a sewage intercepting and impurity removal structure for filtering rainwater.

Further, in order to give full play to the role of rainwater itself, the underground water storage structure is provided with a water intake pipeline, and the water intake pipeline extends upwards to the ground for water use for greening irrigation or road dust removal.

Description of drawings

Fig. 1 is the cross-sectional schematic diagram of the road rainwater collection system along the road width direction in the specific embodiment 1 of the road rainwater collection system of the sponge city of the present invention;

Fig. 2 is a partial cross-sectional schematic diagram of drainage ditches and underground cisterns in Fig. 1;

Fig. 3 is a partial cross-sectional schematic diagram of the stone along the road and the green belt part in Fig. 1;

Fig. 4 is a schematic longitudinal sectional view at A-A in Fig. 2 .

In the figure: 1-road permeable layer, 10-upper permeable anti-slip layer, 11-medium permeable anti-slip layer, 12-permeable filter layer, 13-roadside stone, 2-cement stabilized gravel base, 3-waterproof seal layer, 4 -drainage ditch, 40-grit chamber, 41-first inner side wall, 5-underground storage tank, 51-sewage interception filter, 52-water intake pipeline, 53-water pump, 54-sprayer, 55-fire protection Water cock, 6- overflow channel.

Detailed ways

The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

Specific embodiment 1 of the road rainwater collection system of the sponge city of the present invention, as shown in Figure 1, the road rainwater collection system of the sponge city comprises the road body part and the rainwater collection part that is located at both sides of the road body part, and the road body part includes The road permeable layer 1 and the road base layer are arranged sequentially from top to bottom, and a waterproof sealing layer 3 is interposed between the road permeable layer 1 and the road base layer. , the upper surface of the road permeable layer 1 is the road surface. In this embodiment, the permeable anti-slip layer is made of OGFC. The Chinese name of OGFC is "drainage asphalt mixture", also known as "large gap open graded drainage type asphalt wear layer". Aggregate, a small amount of fine aggregate and asphalt form a "skeleton-void" structure according to the intercalation mechanism. Since the gaps between the coarse aggregate are not filled by fine aggregate and asphalt, a connected void is formed inside the OGFC. On the one hand, it can quickly drain the rainwater on the road surface and avoid the accumulation of rainwater on the road surface to form a water film, so it has good anti-skid performance; on the other hand, because of the existence of internal voids in OGFC, the road surface can effectively reduce vehicle tire noise.

The water-permeable anti-skid layer adopts a double-layer structure and includes an upper water-permeable anti-skid layer 10 made of OGFC-10 and a middle water-permeable anti-skid layer 11 made of OGFC-13. The OGFC-10 laying thickness of the upper water-permeable anti-skid layer 10 is 3cm. The Marshall stability is 7.1KN, the dynamic stability is 3473 times/mm, and the porosity is 23%; the OGFC-13 laying thickness of the medium permeable anti-slip layer 11 is 4cm, and its Marshall stability is 6.5KN, and the dynamic stability is 4480 times /mm, with a porosity of 22%, which ensures that the pavement has stable water permeability and slip resistance. The water-permeable filter layer 12 is positioned at the lower side of the water-permeable anti-skid layer 11. In the present embodiment, the water-permeable filter layer 12 is a concrete layer with voids inside, and its laying thickness is 18cm, and the porosity is 19.2%. The infiltration rainwater is filtered, and the concrete layer has good structural strength, which provides stable support for the upper water-permeable anti-skid layer 10 and the middle water-permeable anti-skid layer 11. In other embodiments, the concrete layer may be replaced with a layer of permeable bricks made of permeable bricks.

The subgrade at the bottom is cement stabilized macadam base 2, cement stabilized macadam base 2 is poured by mixing cement and macadam, its unconfined compressive strength is 3.10Mpa, it has low cost and good compressive performance, Can be used in large quantities as the foundation of roads. A waterproof sealing layer 3 is sandwiched between the top of the cement-stabilized gravel base 2 and the bottom of the water-permeable filter layer 12. In this embodiment, the waterproof sealing layer 3 is sealed with emulsified asphalt slurry. In other embodiments, according to actual construction conditions, the emulsified asphalt slurry seal layer can be replaced with rubber and plastic waterproof materials, such as: butyl rubber, polyvinyl chloride or polyurethane materials; or, the emulsified asphalt slurry The seal layer is replaced with cement-based waterproof materials, such as cement slurry with waterproofing agent, or accelerator mortar based on cement and sodium silicate, which can play the role of waterproofing and diverting rainwater.

In order to ensure the flow conductivity of the waterproof seal layer 3, the upper surface of the waterproof seal layer 3 is an arched surface that is high in the middle and low on both sides along the road width direction, and the line from the center of the road to the side edge of the road and the horizontal plane form a 3 ° angle. Rainwater seeps down to the upper surface of the waterproof seal layer 3 through the water-permeable anti-slip layer and the water-permeable filter layer 12, and drains from the center of the road to both sides on the upper surface of the waterproof seal layer 3, avoiding the accumulation of seepage rainwater on the waterproof seal layer 3, effective drainage and collection cannot be carried out. In other embodiments, the angle between the upper surface of the waterproof sealing layer 3 from the center of the road to the side edge of the road and the horizontal plane may be any angle greater than 3° and not greater than 5°. Setting the waterproof sealing layer 3 can not only play the role of diversion to the seepage rainwater, but also play the role of isolation and protection to the road permeable layer 1, preventing underground seepage from invading the road permeable layer 1, and avoiding the upper water-permeable anti-skid layer 10 and The middle water-permeable anti-slip layer 11 is in a soaked state for a long time, which affects its water-permeable effect and service life.

On both sides of the waterproof sealing layer 3 in the width direction of the road, drainage ditches 4 are respectively arranged, and the drainage ditches 4 are arranged along the length direction of the road. The inner wall is the first inner side wall 41, and the two side edges of the waterproof sealing layer 3 in the width direction of the road extend to the first inner side wall 41 of the drainage ditch 4 respectively, so that the drainage space in the drainage ditch 4 and the upper surface of the waterproof sealing layer 3 The space above the surface is connected to receive infiltrating rainwater from the road surface, and collect and divert the infiltrating rainwater to the underground reservoir 5. In this embodiment, the drainage ditch 4 is formed to be located in the waterproof seal layer and located in the width direction of the road. Drainage channels on both sides. However, the specific structure of the drainage channel is not limited to the form of the drainage ditch. In other embodiments, the drainage ditch can be replaced by a drainage pipe. The pipe wall of the drainage pipe is sealed with the edge of the waterproof seal, and the drainage pipe is close to the waterproof The pipe wall at the edge of the sealing layer is provided with openings arranged at intervals, through which the interior of the drainage pipe is communicated with the space above the upper surface of the waterproof sealing layer, and can also receive infiltration rainwater from the road surface.

The underground reservoir 5 is located below the drainage ditch 4 and is arranged on both sides of the road base in the width direction of the road. The underground reservoir 5 is arranged at intervals along the length direction of the road. The seepage rainwater collected in the drainage ditches 4 is drained into the underground storage tank 5, which is made of concrete pouring, and the underground storage tank 5 constitutes an underground water storage structure. In other embodiments, in order to reduce the amount of construction work, the underground water storage tank can be replaced by an underground water storage tank buried under the drainage ditch. The underground water storage tank 5 is located at the outer side of the road base, which ensures the stability and firmness of the entire road foundation, avoids setting the underground water storage structure directly below the road and causing the road to be in a suspended state, and prevents the road from being in a suspended state after long-term rolling and use. There is a problem of road subsidence. The design of the drainage ditches 4 and the interval underground storage tanks 5 can not only ensure the complete collection and drainage of infiltrating rainwater, but also reduce the construction quantity and engineering quantity of the underground storage structures, and simplify the construction operation.

On both sides of the road permeable layer 1 in the width direction of the road, curb stones 13 are respectively arranged, and the curb stones 13 are arranged side by side along the length direction of the road, and sidewalks and green belts are also provided outside the curb stones 13, in order to ensure The road rainwater collection system can effectively cope with heavy rainfall weather. Overflow channels 6 are respectively provided on both sides of the road permeable layer 1 in the width direction of the road, and the overflow inlet of the overflow channel 6 is opened on the side wall of the curb 13 close to the road surface Above, an antifouling grille is provided at the overflow inlet to prevent road debris from entering the overflow channel 6 with rainwater. The bottom edge of the overflow inlet is slightly lower than the road surface, and the space above the upper surface of the road permeable layer is connected with the drainage space of the drainage ditch 4 through the overflow channel 6, so that the rainwater that cannot infiltrate in time can directly enter the drainage ditch 4 from the overflow channel 6 , The overflow channel 6 provides a fast-draining circulation path for the overflowing water on the road surface, so as to avoid the situation of road accumulation caused by heavy rainfall. As shown in Figure 4, the overflow channel 6 extends downwards and its overflow outlet is located at the upper side of the drainage ditch 4, a grit chamber 40 is provided near the overflow outlet of the drainage ditch 4, and the grit chamber 40 is located at the top of the drainage ditch 4. A plurality of intervals are provided in the direction of length extension, and the bottom surface of the grit chamber 40 is lower than the bottom wall of the drainage ditch 4, so that the rainwater mixed with sand grains is subject to settlement when flowing through the grit chamber 40 and is separated from the rainwater in the drainage ditch 4. Separation can quickly and effectively remove sand from the overflowing water on the road directly discharged through the overflow channel 6.

The interior of the underground storage tank 5 is provided with a sewage intercepting filter 51, which can carry out secondary decontamination and filtration of the rainwater entering the underground storage tank 5, ensuring the cleanliness of the rainwater stored therein, and ensuring that it can be used for subsequent greening or For municipal environmental protection use, the sewage intercepting filter screen 51 constitutes a sewage intercepting and impurity removal structure for filtering rainwater. As shown in Fig. 3 and Fig. 4, a water intake pipeline 52 is provided on the underground reservoir 5, and the water intake pipeline 52 extends upwards to the ground, and is connected with the sprinkler 54 and the fire hydrant 55 in the green belt, And a water pump 53 is connected in series near the position of the underground storage tank 5 of the water intake pipeline 52, and the clean rainwater in the underground storage tank 5 is lifted to the ground by starting the water pump 53, and the green belt on the roadside is sprayed with a sprinkler 54. For spray irrigation, the fire hydrant 55 can also be used to supply water to the road dedusting vehicle, and the clean rainwater is sprayed onto the road by the road dedusting vehicle, realizing the purpose of dedusting and purifying the road surface. Replacing the originally used tap water with clean rainwater not only gives full play to the role of rainwater itself, but also avoids the waste of drinking water resources caused by the use of tap water. Rainwater can be taken as needed, and can be adjusted and allocated in the most reasonable way, realizing the goal of building a real sponge city.

The specific embodiment 2 of the road rainwater collection system of the sponge city of the present invention differs from the specific embodiment 1 in that the design of the road permeable layer and the base layer can be appropriately adjusted according to the actual construction situation, and the road permeable layer only includes One layer of OGFC and concrete layer, one layer of OGFC can play the role of water permeability and anti-slip. In addition, the cement-stabilized crushed stone base can be a base of construction waste debris, which not only meets the structural stability requirements of the subgrade, but also recycles construction waste debris, realizes the recycling of construction waste, and reduces road traffic. construction costs.

The specific embodiment 3 of the road rainwater collection system of the sponge city of the present invention is different from the specific embodiment 1 in that, in order to reduce the construction quantity of underground storage tanks, only one side of the road base and the drainage ditches located on this side can be used. Underground storage tanks are arranged at intervals, and the drainage ditches on the other side of the underground storage tanks are connected to the water inlet of the underground storage tanks through the through-pipelines that cross the road base. The drainage ditch is connected with the underground storage tank, which can effectively reduce the engineering quantity and construction cost compared with building underground storage tanks on both sides of the road.

The specific embodiment 4 of the road rainwater collection system of the sponge city of the present invention differs from the specific embodiment 1 in that in order to adapt to different construction conditions and use requirements, the thickness of the permeable anti-slip layer can be adaptively adjusted, and the OGFC The thickness of the prepared water-permeable anti-slip layer is 2 cm, which can also meet the requirements of road water-permeability and wear resistance. In other embodiments, the thickness of the water-permeable anti-slip layer made of OGFC can also be any size between 2 cm and 7 cm or between 7 cm and 10 cm.

The specific embodiment 5 of the road rainwater collection system for the sponge city of the present invention differs from the specific embodiment 1 in that in order to adapt to different construction conditions and use requirements, the thickness of the concrete layer can be adjusted adaptively, and the thickness of the concrete layer can be adjusted adaptively. The thickness of the concrete layer is 10cm, which can also meet the requirements of supporting the permeable filter layer and structural strength. In other embodiments, the thickness of the concrete layer can also be any size between 10 cm and 18 cm or between 18 cm and 30 cm.

Claims (12)

1. a kind of roadway rainwater collection system in sponge city, characterized in that the road including setting gradually from top to bottom is permeable Layer and base course, are folded with waterproof sealing, the waterproof sealing is located at road width between the road pervious bed and base course The two sides in direction are respectively equipped with drainage channel, and the drainage channel is disposed to extend along link length direction, outside the base course Side is equipped with the underground storage structure being connected to the drainage channel；

The two sides that the road pervious bed is located at road width direction are respectively equipped with spilling water channel, and the spilling water channel is connected to road The space more than upper surface of pervious bed, and the drainage channel respectively with it is more than the upper surface of the waterproof sealing space and The spilling water channel connection.

2. the roadway rainwater collection system in sponge city according to claim 1, characterized in that the drainage channel is row Box Drain, the both sides of the edge that the waterproof sealing is located at road width direction extend respectively to the close waterproof sealing of drainage ditch The side inner wall at center.

3. the roadway rainwater collection system in sponge city according to claim 1 or 2, characterized in that the waterproof sealing Upper surface be the arcuate surface low in intermediate high two sides along road width direction.

4. the roadway rainwater collection system in sponge city according to claim 3, characterized in that the waterproof sealing is cream Change asphalt slurry seal coat.

5. the roadway rainwater collection system in sponge city according to claim 1, characterized in that the road pervious bed packet Permeable skid layer and water-permeable filter layer are included, the water-permeable filter layer is located at the downside of permeable skid layer；The permeable skid layer is adopted It is made of OGFC, the water-permeable filter layer is the concrete layer with gap.

6. the roadway rainwater collection system in sponge city according to claim 5, characterized in that the permeable skid layer Thickness is 2cm to 10cm.

7. the roadway rainwater collection system in sponge city according to claim 5, characterized in that the thickness of the concrete layer Degree is having a size of 10cm to 30cm.

8. the roadway rainwater collection system in sponge city according to claim 1, characterized in that the base course is cement Stabilized macadam base.

9. the roadway rainwater collection system in sponge city according to claim 1, characterized in that road pervious bed position It is respectively equipped with curb in the two sides in road width direction, the curb is arranged in juxtaposition along link length direction and the spilling water The spilling water entrance in channel is opened on the side wall on close road surface of the curb.

10. the roadway rainwater collection system in sponge city according to claim 2, characterized in that the drainage ditch Spilling water exit close to the spilling water channel is equipped with riffler.

11. the roadway rainwater collection system in sponge city according to claim 2, characterized in that the underground storage knot Structure is set to the lower section of drainage ditch, and the inside of underground storage structure is equipped with section dirty removal of impurities structure for filtering rainwater.

12. the roadway rainwater collection system in sponge city according to claim 11, characterized in that the underground storage knot Structure is equipped with water intaking pipeline, and the intake pipe road extends upwardly to ground for making for green area irrigation or road dedusting water With.