CN111075003A - Road surface washing method based on rainwater reuse - Google Patents
Road surface washing method based on rainwater reuse Download PDFInfo
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- CN111075003A CN111075003A CN201911258146.5A CN201911258146A CN111075003A CN 111075003 A CN111075003 A CN 111075003A CN 201911258146 A CN201911258146 A CN 201911258146A CN 111075003 A CN111075003 A CN 111075003A
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- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000005406 washing Methods 0.000 title claims description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 129
- 238000003860 storage Methods 0.000 claims abstract description 51
- 238000004064 recycling Methods 0.000 claims abstract description 28
- 238000011010 flushing procedure Methods 0.000 claims abstract description 11
- 239000000428 dust Substances 0.000 claims abstract description 6
- 239000007921 spray Substances 0.000 claims description 36
- 239000002689 soil Substances 0.000 claims description 21
- 239000004576 sand Substances 0.000 claims description 13
- 238000013461 design Methods 0.000 claims description 12
- 239000000945 filler Substances 0.000 claims description 7
- 230000008595 infiltration Effects 0.000 claims description 7
- 238000001764 infiltration Methods 0.000 claims description 7
- 238000012856 packing Methods 0.000 claims description 7
- 230000008569 process Effects 0.000 abstract description 6
- 238000004140 cleaning Methods 0.000 abstract description 3
- 238000005507 spraying Methods 0.000 abstract description 3
- 238000012423 maintenance Methods 0.000 abstract description 2
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- 239000003344 environmental pollutant Substances 0.000 description 4
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- 241000233948 Typha Species 0.000 description 3
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Classifications
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F5/00—Sewerage structures
- E03F5/04—Gullies inlets, road sinks, floor drains with or without odour seals or sediment traps
- E03F5/0401—Gullies for use in roads or pavements
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01H—STREET CLEANING; CLEANING OF PERMANENT WAYS; CLEANING BEACHES; DISPERSING OR PREVENTING FOG IN GENERAL CLEANING STREET OR RAILWAY FURNITURE OR TUNNEL WALLS
- E01H3/00—Applying liquids to roads or like surfaces, e.g. for dust control; Stationary flushing devices
- E01H3/04—Fixed devices, e.g. permanently- installed flushing means
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B3/00—Methods or installations for obtaining or collecting drinking water or tap water
- E03B3/02—Methods or installations for obtaining or collecting drinking water or tap water from rain-water
-
- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F5/00—Sewerage structures
- E03F5/04—Gullies inlets, road sinks, floor drains with or without odour seals or sediment traps
- E03F5/06—Gully gratings
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F5/00—Sewerage structures
- E03F5/10—Collecting-tanks; Equalising-tanks for regulating the run-off; Laying-up basins
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F5/00—Sewerage structures
- E03F5/14—Devices for separating liquid or solid substances from sewage, e.g. sand or sludge traps, rakes or grates
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/108—Rainwater harvesting
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- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Public Health (AREA)
- Water Supply & Treatment (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Road Paving Structures (AREA)
Abstract
本发明涉及一种基于雨水回用的路面冲洗方法，该基于雨水回用的路面冲洗方法，包括以下步骤：步骤S1：雨水收集；步骤S2：雨水处理及溢流；步骤S3：雨水储存及应用；将所述步骤S2处理过的雨水，由穿孔管送至提升泵房中，由回用水泵泵将处理后的雨水提升至回用水管道，该回用水管道与道路两侧的喷头连接，用来冲洗路面降尘等；本发明优点在于和现有的冲洗路面工艺相比，省去了道路清洗采用的喷洒车的购买与维修、水资源的损失、操作人员的工资等的财政支出，简化了处理流程，利于控制管理，适用于各个情景。此方案在很大程度上节约水资源，也响应了国家关于雨水资源利用的倡导，与新型透水路面相结合是此方案未来的趋势。
The present invention relates to a road surface flushing method based on rainwater reuse, which comprises the following steps: step S1: rainwater collection; step S2: rainwater treatment and overflow; step S3: rainwater storage and application; the rainwater treated in step S2 is sent to the lifting pump room through a perforated pipe, and the treated rainwater is lifted to the recycling water pipeline by a recycling water pump, and the recycling water pipeline is connected to the nozzles on both sides of the road to flush the road surface and reduce dust, etc.; the advantage of the present invention is that compared with the existing road surface flushing process, the financial expenditure of the purchase and maintenance of the spraying vehicle used for road cleaning, the loss of water resources, the salary of operators, etc. is saved, the processing flow is simplified, and it is conducive to control and management, and it is applicable to various scenarios. This scheme saves water resources to a great extent, and also responds to the country's advocacy on the utilization of rainwater resources. Combining with a new type of permeable road surface is the future trend of this scheme.
Description
Technical Field
The invention belongs to the technical field of rainwater recycling, and particularly relates to a pavement washing method based on rainwater recycling.
Background
Along with the process of urbanization, the ground is hardened (such as building roofs, pavements, squares, parking lots and the like), the hydrological characteristics of the original ground are changed, and natural hydrological circulation is interfered. The effect of this intervention is negative: the phenomena of large amount of rainwater loss, frequent water accumulation on traffic pavements to influence normal life, increased load of a rearranged water system due to the fact that the peak value of rainwater flood is increased, the water content of soil is reduced, the heat island effect, the underground water level is lowered and the like are aggravated. Meanwhile, the problem of water shortage in cities in China is more and more serious, and in more than six hundred cities in China, nearly 400 cities are in water shortage or serious water shortage and show an increasing trend, so that the country costs huge capital and works on city water transfer projects. Therefore, the invention provides a road surface washing method based on rainwater recycling.
Disclosure of Invention
The invention aims to solve the problems and provide a road surface washing method based on urban rainwater recycling, which overcomes the current situation of water resource shortage of washed road surfaces.
The invention realizes the purpose through the following technical scheme:
a road surface washing method based on rainwater recycling comprises the following steps:
step S1: rainwater collection
Rainwater penetrating through the rainwater inlet is collected to the filtering tank through a rainwater drainage pipeline, and the rainwater effectively intercepts larger pollutants through the rainwater grate, so that the pipeline is prevented from being blocked;
step S2: rainwater treatment and overflow
Enabling the rainwater collected in the step S1 to flow to a rainwater garden of the filtering tank through a water inlet pipe, and performing purification treatment through the rainwater garden; when the rainwater amount exceeds the designed highest water level of the water storage tank, the rainwater overflows to a municipal drainage pipeline through an overflow pipeline of the rainwater water storage tank and is directly discharged;
step S3: rainwater storage and application
Delivering the rainwater treated in the step S2 to a lifting pump room through a perforated pipe, lifting the treated rainwater to a reuse water pipeline through a reuse water pump, wherein the reuse water pipeline is connected with spray heads on two sides of a road and is used for washing the road surface for dust fall and the like, and the process continuously runs for a period of fixed times; when the stored rainwater reaches the highest water level, the rainwater enters an overflow pipeline and is directly discharged to enter a municipal pipe network;
step S4: municipal water replenishing in arid period
When the use of the rainwater is finished in the drought climate without rainfall for a long time or after the rainwater is stored, municipal water supplement is considered, and the water can be supplemented to the lifting pump house by a municipal water storage vehicle and the like.
As a further optimized scheme of the present invention, the gutter inlet for rainwater reuse in step S1 is set as a flat grate type gutter inlet, and the upper surface of the gutter inlet well grate should be 30mm lower than the road surface at that position.
As a further optimization scheme of the present invention, in the step S3, the rainwater storage tank needs to be set with a designed highest water level and a designed lowest water level, when the lowest water level is reached, the water pump stops working, and when the highest water level is reached, rainwater enters the overflow pipeline and is directly discharged into the municipal pipe network.
A system of a pavement washing method based on rainwater recycling comprises a rainwater collecting system, a recycling water system and a municipal drainage system, wherein the rainwater collecting system comprises a rainwater inlet, a rainwater drainage pipeline and a rainwater storage pool, the rainwater inlet is arranged at two ends of a pavement and one side of a sidewalk, one end of the rainwater drainage pipeline is connected with the rainwater inlet, and the other end of the rainwater drainage pipeline is communicated with the rainwater storage pool;
the rainwater storage tank is divided into a filtering tank and a lifting pump room, the filtering tank is arranged at the front end of the rainwater storage tank, the lifting pump room is arranged at the rear end of the rainwater storage tank, the filtering tank is communicated with a rainwater drainage pipeline, and the filtering tank is communicated with the lifting pump room; a rainwater garden is arranged in the filtering tank, rainwater entering from the rainwater drainage pipeline is filtered by the rainwater garden, and purified water after filtering enters the lift pump room.
The reuse water system comprises a reuse water pump, a reuse water pipeline and a spray head, wherein a water inlet of the reuse water pump is communicated with the lift pump room, a water outlet is connected with an inlet of the reuse water pipeline, and an outlet of the reuse water pipeline is connected with the spray head. The reuse water pump lifts the stored rainwater to the reuse water pipe as required, and the rainwater is flushed on the road surface as required.
Municipal drainage system includes municipal drainage pipe and municipal rainwater well, and municipal drainage pipe locates the pavement below, is equipped with a plurality of municipal rainwater well on the municipal drainage pipe, and municipal rainwater well passes through the upper portion that the overflow pipe connects the elevator pump room. The redundant rainwater is connected with a municipal drainage pipeline through an overflow pipe.
As a further optimization scheme of the invention, the rainwater garden comprises a water storage layer, a covering layer, vegetation and planting soil layers, an artificial packing layer, a sand layer, a gravel layer and perforated pipes, wherein the water storage layer, the covering layer, the vegetation and planting soil layers, the artificial packing layer, the sand layer and the gravel layer are sequentially arranged from top to bottom, the perforated pipes are arranged in the gravel layer, and the outlet ends of the perforated pipes extend into the lift pump house.
As a further optimization scheme of the invention, the rainwater storage tank is arranged below a middle green belt of a road surface, the road surface comprises the middle green belt, a roadway, a sidewalk and an open ground for greening, the roadway, the sidewalk and the open ground green belt are sequentially arranged on two sides of the middle green belt, a kerbstone is arranged between the roadway and the sidewalk, an infiltration pipe communicated with a rainwater port is arranged below the sidewalk, and an inspection port is arranged on the infiltration pipe.
As a further optimized scheme of the invention, the rainwater grate is arranged on the rainwater inlet. The filter is used for filtering sundries with large diameters and avoiding blocking pipelines.
As a further optimization scheme of the invention, the spray heads are arranged on two sides of the roadway of the road surface.
As a further optimized scheme of the invention, the spray nozzle is connected to the spray pipe, and the spray pipe is connected with the reuse water pipeline.
The invention has the beneficial effects that:
1) the invention provides a road surface washing method based on rainwater recycling, which comprises the following steps: collecting rainwater, flowing into a rainwater port, entering a rainwater well, and intercepting garbage by a rainwater grate above the rainwater well; rainwater flows into a rainwater garden at the front part of the water storage tank through a water inlet pipeline, and if the rainfall is large and exceeds the designed highest water level of the water storage tank, the rainwater directly flows into a municipal drainage pipeline through an overflow pipe; the rainwater in the rainwater garden at the front end of the water storage tank is treated for a period of time to remove inorganic particles such as silt carried in the water, then the treated rainwater flows into a rainwater lifting pump room at the rear end of the water storage tank through a perforated pipe of a gravel layer, and the treated rainwater is lifted and pressurized by a pump and then conveyed into the recycling pipeline for a spray head to wash the road surface and reduce dust. The rainwater storage tank and the rainwater garden therein are added in the process of directly discharging rainwater to the municipal pipe network, and the rainwater storage tank can not only treat and store rainwater, but also perform the functions of flow regulation and the like; in the time of large rainfall, the reservoir firstly stores a large amount of initial rainwater, the rainwater which is discharged to the municipal drainage pipeline and exceeds the designed highest water level stays for a long time, the rainwater at the upper end is clear and directly flows into a municipal drainage pipe network, inorganic particles such as silt in the rainwater can be obviously reduced under the same rainwater treatment, the rainwater is pretreated, and the pressure of subsequent treatment is reduced; after the stored rainwater is treated by the rainwater garden, the rainwater can be directly lifted by the pump and pressurized to be conveyed into the reclaimed water pipe to be supplied to the spray head, so that the spray head can effectively flush the road surface and reduce air dust.
2) In conclusion, compared with the existing road surface washing process, the road surface washing method based on rainwater recycling provided by the invention saves the financial expenses of purchase and maintenance of a spraying vehicle, loss of water resources, wages of operators and the like for road washing, simplifies the treatment process, is beneficial to control and management, and is suitable for various scenes. The scheme saves water resources to a great extent, also responds to the national advocates about rainwater resource utilization, and is a future trend of the scheme when combined with a novel permeable pavement.
Drawings
Fig. 1 is a schematic plan view of a system of a road surface washing method based on rainwater reuse according to the first embodiment of the present invention;
FIG. 2 is a schematic sectional view of a system of a road surface washing method based on rainwater reuse according to a first embodiment of the present invention;
FIG. 3 is a schematic view of a rainwater garden of the system of the road surface washing method based on rainwater reuse according to the first embodiment of the present invention;
fig. 4 is a schematic structural diagram of the present invention according to the first embodiment.
In the figure: the rainwater irrigation system comprises a rainwater inlet 1, a rainwater drainage pipeline 2, a rainwater storage tank 3, a filter tank 4, a lifting pump house 5, a rainwater garden 6, a water storage layer 7, a covering layer 8, a vegetation and planting soil layer 9, an artificial packing layer 10, a sand layer 11, a gravel layer 12, a perforated pipe 13, an infiltration pipe 14, a municipal rainwater well 15, a reuse water pump 16, a reuse water pipeline 17, a spray head 18, a spray pipe 19, an overflow pipe 20, an intermediate green belt 101, a roadway 102, a sidewalk 103 and an open-air green 104.
Detailed Description
The present application will now be described in further detail with reference to the drawings, it should be noted that the following detailed description is given for illustrative purposes only and is not to be construed as limiting the scope of the present application, as those skilled in the art will be able to make numerous insubstantial modifications and adaptations to the present application based on the above disclosure.
A road surface washing method based on rainwater recycling comprises the following steps:
step S1: rainwater collection
Rainwater penetrating through the rainwater port 1 is collected to the filtering tank 4 through the rainwater drainage pipeline 2, and the rainwater effectively intercepts larger pollutants through the rainwater grate, so that the pipeline is prevented from being blocked;
step S2: rainwater treatment and overflow
Enabling the rainwater collected in the step S1 to flow to the rainwater garden 6 of the filter tank 4 through the water inlet pipe, and performing purification treatment through the rainwater garden 6; when the rainwater amount exceeds the designed highest water level of the water storage tank, the rainwater overflows to a municipal drainage pipeline through an overflow pipe 20 of the rainwater water storage tank 3 and is directly discharged;
step S3: rainwater storage and application
Delivering the rainwater treated in the step S2 to a lift pump room 5 through a perforated pipe 13, and lifting the treated rainwater to a reuse water pipeline 17 through a reuse water pump 16, wherein the reuse water pipeline 17 is connected with spray heads 18 on two sides of a road and is used for flushing the road surface for dust fall and the like, and the process continuously runs for a period of fixed times; when the stored rainwater reaches the highest water level, the rainwater enters the overflow pipe 20 and is directly discharged into a municipal pipe network;
step S4: municipal water replenishing in arid period
In a drought climate where rainfall does not occur for a long time or when the stored rainwater is used, municipal water replenishing is considered, and the lift pump house 5 can be replenished with water by a municipal water storage vehicle and the like.
Preferably, the rainwater inlet 1 for rainwater recycling is a flat grate type rainwater inlet 1, and the upper surface of the well grate of the rainwater inlet 1 is 30mm lower than the road surface of the road.
Preferably, in the step S2, the rainwater garden 6 is installed at the front end of the rainwater storage pool 3, and the rainwater garden 6 includes a water storage layer 7, a bark cover layer 8, vegetation, an artificial filler layer 10, a sand layer 11, and a gravel layer 12;
preferably, in the step S3, the rainwater storage tank 3 needs to set a designed maximum water level and a designed minimum water level, when the minimum water level is reached, the water pump stops working, and when the maximum water level is reached, rainwater enters the overflow pipe 20 and is directly discharged into the municipal pipe network.
Preferably, the reuse water pump 16 in step S3 needs to be provided with a same model for standby.
As shown in fig. 1-4, a system of a road surface washing method based on rainwater recycling comprises a rainwater collection system, a recycling water system and a municipal drainage system, wherein the rainwater collection system comprises a rainwater inlet 1, a rainwater drainage pipeline 2 and a rainwater storage tank 3, the rainwater inlet 1 is arranged at two ends of a road surface and one side of a sidewalk 103, one end of the rainwater drainage pipeline 2 is connected with the rainwater inlet 1, and the other end is communicated with the rainwater storage tank 3;
the rainwater storage tank 3 is divided into a filtering tank 4 and a lifting pump room 5, the filtering tank 4 is arranged at the front end of the rainwater storage tank 3, the lifting pump room 5 is arranged at the rear end of the rainwater storage tank 3, the filtering tank 4 is communicated with a rainwater drainage pipeline 2, and the filtering tank 4 is communicated with the lifting pump room 5; the rainwater garden 6 is arranged in the filtering tank 4, rainwater entering from the rainwater drainage pipeline 2 is filtered by the rainwater garden 6, and purified water after filtering enters the lift pump house 5.
Preferably, the rainwater garden 6 comprises a water storage layer 7, a covering layer 8 (bark), vegetation and planting soil layers 9 (cattail), an artificial packing layer 10, a sand layer 11, a gravel layer 12 and a perforated pipe 13, wherein the water storage layer 7, the covering layer 8, the vegetation and planting soil layers 9, the artificial packing layer 10, the sand layer 11 and the gravel layer 12 are sequentially arranged from top to bottom, the perforated pipe 13 is arranged in the gravel layer 12, and the outlet end of the perforated pipe 13 extends into the lifting pump house 5.
Preferably, the rainwater storage tank 3 is arranged below a middle green belt 101 of a road surface, the road surface comprises the middle green belt 101, a roadway 102, a sidewalk 103 and an open-air greening 104, the two sides of the middle green belt 101 are sequentially provided with the roadway 102, the sidewalk 103 and the open-air greening 104, a curb is arranged between the roadway 102 and the sidewalk 103, an infiltration pipe 14 communicated with the rainwater port 1 is arranged below the sidewalk 103, and an inspection port is arranged on the infiltration pipe 14.
Preferably, the rainwater grate is arranged on the rainwater port 1. The filter is used for filtering sundries with large diameters and avoiding blocking pipelines.
The reuse water system comprises a reuse water pump 16, a reuse water pipeline 17 and a spray head 18, wherein a water inlet of the reuse water pump 16 is communicated with the lift pump room 5, a water outlet is connected with an inlet of the reuse water pipeline 17, and an outlet of the reuse water pipeline 17 is connected with the spray head 18. The reuse water pump 16 lifts the stored rainwater to the reuse water pipe as required, and flushes the rainwater to the road surface as required.
Preferably, the spray heads 18 are disposed on both sides of the roadway 102.
Preferably, the spray head 18 is connected to a spray pipe 19, and the spray pipe 19 is connected to the reuse water pipe 17.
Municipal drainage system includes municipal drainage pipe and municipal rainwater well 15, and municipal drainage pipe locates people moving walkways 103 below, is equipped with a plurality of municipal rainwater well 15 on the municipal drainage pipe, and municipal rainwater well 15 passes through overflow pipe 20 and connects the upper portion of elevator pump room 5. The excess rainwater is connected to municipal drainage pipes by overflow pipes 20.
The filter tank 4 is connected to a municipal drainage pipeline through an overflow pipe 20.
The layers of the rain garden 6 are arranged as follows:
1. aquifer 7
The aquifer 7 is the uppermost layer of the rainwater garden where rainwater can collect and settle, and the height of the layer is generally 100-250mm, but can change relatively with the surrounding terrain and design.
2. Cover layer 8
The cover 8 is usually made of bark, preferably 50-80mm deep. It has the function of preserving soil moisture, thereby can prevent that top layer soil from reducing rainwater infiltration performance because lack moisture and induration.
Moreover, the microorganisms growing between the bark and the soil can degrade organic matters in the water body and purify the water body. Meanwhile, runoff can be prevented from directly scouring the soil on the lower layer.
3. Vegetation and planting soil layer 9
The planting soil layer mainly plays a role in filtration and adsorption. The root system of the plants in the rain garden absorbs the pollutants such as carbon oxides, metal ions, nutrients and the like of the infiltrated water . The planting soil layer is preferably sandy soil with a large permeability coefficient, and the component should contain 60% -85% of sand and 5% -10% of organic components, and the clay content is not more than 5%. The thickness of the soil layer is determined according to the type of the selected plants, when herbaceous plants are adopted, the thickness is about 250mm, shrubs need to be 50-80mm thick, and arbors need to be more than 1 m.
4. Artificial packing layer 10
The artificial filler layer 10 needs to be made of natural or artificial materials with strong permeability, the thickness of the artificial filler layer is determined according to local rainfall conditions, the area of a rainwater garden and the like, and when sandy soil is selected, the main components of the artificial filler layer are consistent with those of a planting soil layer, the thickness of the artificial filler layer is 0.5m-1.2 m. When furnace clarification or bunk stone is selected, the permeability coefficient is generally not less than 10-5 m/s.
5. Sand layer 11
Laying a sand layer 11 with the thickness of 150mm between the artificial filler layer 10 and the gravel layer 12 can prevent soil particles from blocking the perforated pipes 13 of the next layer, and meanwhile, the sand layer 11 also has the function of ventilation. It is also possible to protect the underlying gravel layer 12 with geotextile instead of the sand layer 11, but there is a disadvantage in that geotextile is easily clogged up.
6. A gravel layer 12
The gravel layer 12 is made of gravel having a diameter of not more than 50mm and a thickness of 200-300 mm. In which perforated pipes 13 of 100mm diameter can be embedded, from which perforated pipes 13 the percolated rainwater is collected into an adjacent river or other drainage system.
Plant selection principles of the rain garden 6;
firstly, the selection is required to be carried out according to the ecological habits of garden plants
1. Preferably, native plants are selected and foreign species are appropriately matched.
2. The plants with developed root systems, luxuriant stems and leaves and strong purification capacity are selected for degrading and removing pollutants in rainwater.
3. The plants which can tolerate waterlogging and have certain drought resistance are selected.
Secondly, the ornamental property of the plants is considered
Thus Typha is selected-Typhaceae Typha.
The root system is developed, the production capacity is large, and the removal effect on COD and ammoniacal nitrogen is obvious.
Example one
The Anhui province and province fertilizer is applied to a certain road project, the whole field is 1km, and an asphalt pavement is adopted. The fertile city is located in the middle of Anhui province, is located at the edge of subtropical zones, belongs to a moist climate zone of the northern subtropical zones, and has abundant annual average rainfall.
The total length of a designed road section is 1000m, one rainwater port 1 is arranged in every 50m according to requirements, rainwater of a rainwater collection system comes from the rainwater ports 1 on two sides of a road, the total number of the rainwater ports 1 is 40, each side of the rainwater ports 1 is 20, and the total catchment area is roughly estimated to be 40000 square meters. Therefore, the catchment area of each gutter inlet 1 is 200 square meters, and the volume of the rainwater storage pool is calculated according to the flow of the gutter inlet 1.
The runoff coefficient is dependent on the type of surface covered, and according to the road drainage design code (1997), the runoff coefficient psi of the asphalt concrete road surface is 0.95.
According to the regulation of 12.1.2 of the design Specification of urban road (CJJ37-90), "urban road drainage design recurrence period form, the recurrence period is higher than the regional drainage standard, and necessary drainage facilities should be added. When the area of suburb road has city drainage network facilities or drainage planning, the proper reproduction period should be selected according to the third rule. The urban road surface rainwater design reappearance period is related to road types and urban levels. The higher the road category, the higher the city level, the greater its recurrence period.
TABLE 1 urban road drainage design recovery period
The reappearance period of a certain road section is 1.5 years.
Designing rainfall duration and road surface water collection time tlThe method is determined on the basis of comprehensively considering factors such as ground water collecting distance, catchment area, ground coverage, ground gradient and rainfall intensity. According to the regulation of the regulations, when the ground catchment distance is greater than 50m, t1＝5+1.25(L-50)/(VAveragex60) (min), where L is the ground catchment distance (m), Vmean is the cumulative average flow velocity (m/s), and when the ground catchment distance is less than 50m, t is1Taking for 5-l 0 min. The water collecting distance between the rain openings 1 is generally not more than 50m, so that the road surface water collecting time t1Can be directly taken for 5-10 min. With caution, t1Taking the value for 10 min.
Calculating the rainfall amount in the catchment area:
wherein F is the rainwater collecting area (m)2) The length of a certain road section is 1000m, the width is 40m (including a sidewalk 103), the total water catchment area is 40000 square meters, and the water catchment area of a single gutter inlet 1 is 0.02h of a square meter; phi is runoff coefficient, certain roadThe section is 0.95 selected for the asphalt concrete pavement;
when the design recurrence period, the design rainfall duration and the reduction coefficient are determined, a design rainstorm intensity formula for calculating the design flow of the rainwater pipe duct can be written as follows:
the rainstorm intensity formula of the fertile region can be known through determining the parameters of the fertile region as follows:
p is the recovery period, designed to be 1.5 years, t1The pavement afflux time is 10 min.
If Q is F multiplied by phi multiplied by Q (L/S), 0.02h square meter multiplied by 0.95 multiplied by 297.02, 12L/S;
the gutter inlet 1 adopts a single-grate flat-grate gutter inlet 1, and the water drainage capacity is 20L/s.
TABLE 2 gutter inlet 1 form and drainage capability
The total rainwater amount of 40 rainwater inlets is 288m according to the collected rainwater amount 7200L of one rainwater inlet 110min3. The rainwater storage tank is positioned at the central green belt of the road, and the volume of the rainwater storage tank 3 is preliminarily designed to be 350m3(20m × 10m × 2m, length × width × height), wherein the front rain garden 6 has a size of (10m × 10m × 1m, length × width × height). Rainwater is firstly discharged into a rainwater well and then enters the rainwater garden 6 at the front end of the rainwater storage pool 3 through the water inlet pipe, wherein the pipe diameter of the water inlet pipe is set to be 300mm, when the rainwater reaches the designed water level of the rainwater storage pool 3, other rainwater is directly discharged into a municipal drainage pipe through the overflow pipe 20 and enters a river, and the pipe diameter of the overflow pipe 20 is set to be 200 mm. When the water-saving device is used for washing roads, the recycling pump in the reservoir is started, and when the water consumption is lower than the designed water level, the recycling pump stops working. Periodic cleaning is required manually to avoid clogging.
The recycled rainwater is treated by a rainwater garden 6 at the front end of the water storage tank and then directly enters a utilization stage, and is cleaned once a day at 5 am according to a designed road, so that the flow of people is less. A timing device is arranged at the position of the spray pipe 19 to ensure the dynamic control, the spray pipe 19 connected with the rainwater reservoir is buried under a green belt, the thickness of the covering soil is 0.5m according to the required buried depth of a freezing line, and the pipe diameter is DN50 mm; the rotary spray head 18 can be guaranteed to spray on the road surface, the radius of the spray head 18 is set to be 8, the spraying circumferential angle is 180, the flow of the spray head 18 is set to be 1L/S, and the working time of the spray head 18 and the recovered rainwater amount (three days) is set to be 2min according to the cleaning strength.
The spray head 18 is a rotary spray head 18, the rotary spray head 18 is connected to a spray pipe 19, and the spray pipe 19 is connected to the reuse water pipeline 17.
Every 3m is provided with one spray head 18, the total number of 1000m sections is 333, the recycling pump Q is 1L/Sx333L/S according to the flow calculation sprayed by the flow every day, the designed recycling pump is two for standby, and a 20SA-22JA type pump is selected according to the flow requirement.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.
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