CN111472229A

CN111472229A - Urban road bidirectional water inflow ecological detention ditch

Info

Publication number: CN111472229A
Application number: CN202010143860.6A
Authority: CN
Inventors: 吴欢; 魏静婉; 丁冲; 龚霞; 张彦彦; 郑建华
Original assignee: TYLin International Engineering Consulting China Co ltd
Current assignee: TYLin International Engineering Consulting China Co ltd
Priority date: 2020-03-04
Filing date: 2020-03-04
Publication date: 2020-07-31

Abstract

The invention discloses a bidirectional water inflow ecological detention ditch for urban roads, wherein an ecological detention ditch is arranged between a roadway and a sidewalk, the ecological detention ditch comprises a roadway water permeable area and a detention area, and road runoff rainwater flows into the detention area through the roadway water permeable area in a transverse inflow and longitudinal infiltration mode; can make the road rainwater from the infiltration of the road water permeable zone of roadway and the ecological ditch that is detained of curb opening department inflow, strengthen the ability of receiving water of ecological ditch that is detained, solve the problem of curb opening difficulty of intaking and curb area ponding, play stagnant water, infiltration, water purification effect, improve the biological utilization efficiency who is detained the ditch in sponge city.

Description

Urban road bidirectional water inflow ecological detention ditch

Technical Field

The invention relates to the field of municipal road ecological rainwater treatment, in particular to a bidirectional water inflow ecological detention ditch for urban roads.

Background

Urban road surface runoff is a main component of non-point source pollution, and initial rainwater contains more pollutants such as suspended particles, organic pollutants, heavy metals and oil substances and seriously affects the received water body. In the existing drainage mode, drainage pipelines and ditch systems are most commonly applied, but the drainage pipelines and ditch systems can only be used as a rainwater collection system, initial rainwater is directly drained into a receiving water body after being conveyed by a pipeline, so that not only is the water quality of the receiving water body easily polluted, but also pipeline sediments are flushed into the water body, and double pollution is caused. The bioretention facility is an important component of a sponge city, and is a linear, shallow, concave landscape space with rich landscape plants and regular shapes. At present, in the municipal road sponge city design, the ecological ditch of detaining only adopts the curb opening mode of intaking to collect the roadway rainwater. However, rainwater often collects at the position of the road curb belt and does not flow into the ecological retention trench.

Therefore, in order to improve the water collecting performance of the bioretention ditch and enhance the utilization efficiency of the ecological detention ditch, a novel bioretention ditch is needed to enable initial rainwater to be better collected, retained, permeated and purified so as to meet the design requirements of sponge cities.

Disclosure of Invention

In view of the above, the present invention aims to overcome the defects in the prior art, and provide a bidirectional water inflow ecological detention ditch for urban roads, which can better collect, retain, permeate and purify initial rainwater so as to meet the design requirements of sponge cities.

According to the urban road bidirectional water inflow ecological detention ditch, the ecological detention ditch is arranged between a roadway and a sidewalk and comprises a roadway water permeable area and a detention area, and road runoff rainwater flows into the detention area through the roadway water permeable area in a transverse inflow and longitudinal infiltration mode;

furthermore, a kerbstone with a gap is arranged between the water permeable area and the detention area of the roadway, and rainwater on the path flows into the detention area through the kerbstone with the gap;

furthermore, the water permeable area of the roadway sequentially comprises a water permeable brick, a coarse sand dry-mixing layer, a water permeable layer and a gravel cushion layer from top to bottom, and rainwater flowing in a path passes through the water permeable brick, the coarse sand dry-mixing layer, the water permeable layer and the gravel cushion layer and then enters the detention area;

further, a vertical concrete foundation is arranged below the kerbstone with the opening, and the vertical concrete foundation is flush with the bottom of the gravel cushion layer;

further, a vertical concrete separation strip is arranged between the water permeable area of the roadway and the roadway;

further, the detention zone is from top to bottom including planting soil area, isolation layer, coarse sand filter bed, isolation layer and cobble layer in proper order, isolation layer, coarse sand filter bed and cobble layer extend to vertical concrete separate zone to the rubble bed course bottom in the road area of permeating water, planting soil area bottom flushes the setting with vertical concrete foundation bottom.

Further, a permeable layer is arranged between the kerbstone and the detention area;

further, the outer side wall of the ecological detention ditch is wrapped with an HDPE impermeable membrane;

further, the concrete separation belt is C35 concrete, the water permeable layer is non-sand macroporous C20 concrete, and the isolating layer is made of geotextile;

further, the kerbstone with the openings is fixed on a concrete foundation through cement mortar, the thickness of a cement mortar layer is 1-4cm, the thickness of a planting soil layer is 50-70cm, the thickness of a coarse sand filter layer is 8-15cm, and the thickness of a pebble layer is 30-50 cm.

The invention has the beneficial effects that: the urban road bidirectional water inflow ecological detention ditch disclosed by the invention can enable road rainwater to permeate from a permeable area of a roadway and flow into the ecological detention ditch at a curb opening, thereby enhancing the water collection capacity of the ecological detention ditch, solving the problems of difficult water inflow at the curb opening and water accumulation at the curb area, playing roles of water detention, water seepage and water purification and improving the utilization efficiency of the sponge urban biological detention ditch.

Drawings

The invention is further described below with reference to the following figures and examples:

FIG. 1 is a cross-sectional view of the present invention.

Detailed Description

FIG. 1 is a cross-sectional view of the present invention. As shown in the figure, in the urban road bidirectional water inflow ecological detention ditch of the present embodiment, an ecological detention ditch is arranged between the roadway 15 and the sidewalk 16, the ecological detention ditch comprises a roadway permeable area 17 and a detention area, and the road runoff rainwater flows into the detention area through the roadway permeable area 17 in a transverse inflow and longitudinal infiltration manner; road rainwater flows into the ecological retention ditch from the permeable area 17 infiltration of roadway and curb opening, has strengthened the ability of receiving water of ecological retention ditch, has solved the problem that curb opening intake difficulty and curb area ponding, plays stagnant water, infiltration, water purification effect, has improved the utilization efficiency of sponge city biological retention ditch. "lateral inflow" of "road runoff rainwater through the permeable zone 17 of roadway converge into the detention zone in the manner of lateral inflow and longitudinal infiltration" means that the road rainwater directly flows into the detention zone from the ground, and "longitudinal infiltration" means that the road rainwater infiltrates downward and converges into the detention zone, so that the rainwater collection capacity is improved, and surface water accumulation is avoided. A common kerbstone is also arranged between the sidewalk and the detention area, a sand-free large-hole C20 concrete permeable layer 4 is also arranged between the kerbstone 14 of the sidewalk and the detention area, the sand-free large-hole C20 concrete permeable layer 4 extends to the lower part of the kerbstone, and rainwater on one side of the sidewalk freely seeps downwards.

In this embodiment, a kerbstone 6 with a gap is arranged between the water permeable area 17 of the roadway and the detention area, and rainwater flowing through the path flows into the detention area through the kerbstone 6 with the gap; the water permeable area 17 of the roadway sequentially comprises a water permeable brick 2, a coarse sand dry-mixed layer 3, a water permeable layer 4 and a gravel cushion layer 5 from top to bottom, and rainwater flowing in a path enters the detention area after passing through the water permeable brick 2, the coarse sand dry-mixed layer 3, the water permeable layer 4 and the gravel cushion layer 5; one part of rainwater on the road surface can flow rapidly to a detention area, the other part of rainwater penetrates through the water permeable bricks 2 and sequentially enters the coarse sand dry-mixed layer 3, the water permeable layer 4 and the gravel cushion layer 5, the coarse sand dry-mixed layer 3, the water permeable layer 4 and the gravel cushion layer 5 are not communicated with the detention area, the surface layer adopts the sponge urban ecological water permeable bricks 2, and the road surface of the roadway curb belt is changed into water permeable; the coarse sand dry-mixed layer 3 plays a leveling role while being permeable to water; the graded broken stone cushion layer 5 replaces a roadway cushion layer, has higher strength, and plays a role in bearing vehicle load while permeating water.

In the embodiment, a vertical concrete foundation 8 is arranged below the kerb 6 with the opening, and the vertical concrete foundation 8 is flush with the bottom of the gravel cushion 5; the coarse sand dry-mixing layer 3, the permeable layer 4, the gravel cushion layer 5 and the detention area are not communicated. The vertical concrete foundation 8 is made of C35 concrete.

In this embodiment, a vertical concrete separation strip is arranged between the water permeable area 17 of the roadway and the roadway; the permeable area 17 of the roadway is separated from the roadbed and the pavement of the roadway, so that the roadbed and the pavement of the roadway are not affected by the stagnant water in the permeable area 17 of the roadway. The permeable area 17 of the roadway corresponds to the curb of the roadway.

In this embodiment, the detention zone sequentially comprises a planting soil zone 9, an isolation layer 10, a coarse sand filter layer 11, an isolation layer 10 and a pebble layer 12 from top to bottom, and the isolation layer 10, the coarse sand filter layer 11 and the pebble layer 12 extend to the bottom of the gravel cushion layer 5 of the water permeable zone 17 of the roadway to a vertical concrete separation zone; the bottom of the planting soil area 9 is flush with the bottom of the vertical concrete foundation 8. The planting soil layer provides planting conditions for the plants and can play a role in purifying initial rainwater in cooperation with the plants in the ditches; the coarse sand filter layer 11 and the elutriated pebble layer 12 play a role in filtering and purifying initial rainwater. The road runoff rainwater enters the isolation layer 10, the coarse sand filtering layer 11, the isolation layer 10 and the pebble layer 12 through the water permeable bricks 2, the coarse sand dry-mixing layer 3, the water permeable layer 4 and the gravel cushion layer 5 in the water permeable area 17 of the roadway. The isolation layer 10, the coarse sand filter layer 11, the isolation layer 10 and the pebble layer 12 located below the planting soil region 9 extend up to below the gravel cushion 5 of the water permeable region 17 of the roadway to receive the permeated water through the water permeable region 17 of the roadway. The planting soil layer, the sand filter layer and the elutriated pebble layer 12 are separated by an isolation layer 10; the filling layers in the detention groove are separated, so that the fillings in each layer are not mixed. The bottom of the pebble bed 12 is flush with the bottom of the vertical concrete separator.

In this embodiment, a permeable layer 4 is arranged between the curb 6 and the detention zone; the permeable layer 4 is made of sand-free macroporous C20 concrete; the sand-free large-hole C20 concrete is used as the foundation of the curb 6 (the curb is formed by casting C35 concrete and sand-free large-hole C20 concrete in situ), and has the function of water permeability, and the water permeability width of the ecological detention ditch is not occupied. A kerb 14 is also provided between the walkway and the detention zone.

In this embodiment, the outer side wall of the ecological detention trench is wrapped by an HDPE impermeable membrane 13; the concrete separation belt is C35 concrete, and the isolation layer is 10 geotextile; the outer side of the ecological detention ditch is wrapped with an HDPE impermeable membrane 13; at the road filling section, the HDPE impermeable membrane 13 is fully wrapped so as to ensure that the retaining ditch water seepage does not affect the filling roadbed; at road side section of digging, 13 half packages of HDPE prevention of seepage membrane lay in by roadway one side to ensure that the retaining ditch infiltration does not produce the influence to the roadway road bed, and pavement one side rainwater is freely oozed down.

In the embodiment, the kerbstone 6 with the opening is fixed on a concrete foundation through cement mortar, the thickness of the cement mortar layer 7 is 1-4cm, the thickness of the planting soil layer is 50-70cm, the thickness of the coarse sand filter layer 11 is 8-15cm, and the thickness of the pebble layer 12 is 30-50 cm.

Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.

Claims

1. The utility model provides a two-way ecological ditch that is detained of intaking of urban road which characterized in that: set up ecological ditch of detaining between roadway and pavement, ecological ditch of detaining includes that the roadway permeates water the district and detains the district, and road runoff rainwater is permeated water the district through the roadway and is catched the district with the mode of horizontal inflow and vertical infiltration.

2. The urban road bidirectional water inflow ecological detention ditch as claimed in claim 1, wherein: a kerbstone with an opening is arranged between the permeable area and the detention area of the roadway, and rainwater flows into the detention area through the kerbstone with the opening.

3. The urban road bidirectional water inflow ecological detention ditch of claim 2, wherein: the permeable area of the roadway comprises a permeable brick, a coarse sand dry-mixing layer, a permeable layer and a gravel cushion layer from top to bottom in sequence, and rainwater on a path flows into the detention area through the permeable brick, the coarse sand dry-mixing layer, the permeable layer and the gravel cushion layer.

4. The urban road bidirectional water inflow ecological detention ditch according to claim 3, characterized in that: and a vertical concrete foundation is arranged below the kerbstone with the opening, and the vertical concrete foundation is flush with the bottom of the broken stone cushion layer.

5. The urban road bidirectional water inflow ecological detention ditch according to claim 4, characterized in that: and a vertical concrete separation strip is arranged between the water permeable area of the roadway and the roadway.

6. The urban road bidirectional water inflow ecological detention ditch according to claim 5, characterized in that: the detention zone is from top to bottom including planting soil area, isolation layer, coarse sand filtering layer, isolation layer and cobble layer in proper order, isolation layer, coarse sand filtering layer and cobble layer extend to vertical concrete separate zone to the rubble bed course bottom in the road area of permeating water, planting soil district bottom flushes the setting with vertical concrete foundation bottom.

7. The urban road bidirectional water inflow ecological detention ditch according to claim 4, characterized in that: and a permeable layer is arranged between the kerbstone and the detention area.

8. The urban road bidirectional water inflow ecological detention ditch of claim 6, wherein: the outer side wall of the ecological detention ditch is wrapped with an HDPE impermeable membrane.

9. The urban road bidirectional water inflow ecological detention ditch according to claim 8, characterized in that: the concrete separation belt is C35 concrete, the permeable layer is non-sand large-hole C20 concrete, and the isolation layer is geotextile.

10. The urban road bidirectional water inflow ecological detention ditch according to claim 4, characterized in that: the kerbstone with the openings is fixed on a concrete foundation through cement mortar, the thickness of a cement mortar layer is 1-4cm, the thickness of a planting soil layer is 50-70cm, the thickness of a coarse sand filter layer is 8-15cm, and the thickness of a pebble layer is 30-50 cm.