CN207714473U - A kind of Rain Garden suitable for clay area - Google Patents

Abstract

The utility model discloses a kind of Rain Garden suitable for clay area, including sleeve and gravel layer, permeable geotextiles, planting soil layer, coating and the aquifer laid successively from bottom to up；The bottom of sleeve is vertically plugged in gravel layer, top and the flush at the top of coating of sleeve, and cobble is filled in sleeve.Draining blind pipe is embedded in gravel layer, draining blind pipe is equipped with perforation, this is punched through connecting tube and is connected with vertical overflow port.The utility model can be while keeping to rainwater delay, purification function, it avoids changing or improve undisturbed soil on a large scale, construction investment and difficulty of construction are effectively reduced, popularization of the Rain Garden in clay area is conducive to, meets the general requirement that country promotes sponge urban construction.

Description

A kind of Rain Garden suitable for clay area

Technical field

The utility model is related to municipal works technical fields, especially a kind of Rain Garden suitable for clay area.

Background technology

To solve the increasingly severe waterlogging knead dough in city source pollution problem in recent years, building sponge city becomes being total to for industry Know the Compulsory Feature with country.Publication on October 6th, 2015《The General Office of the State Council is about the finger for promoting sponge urban construction Lead opinion》（The Office of the State Council sends out (2015) No. 75）In be even more to be distinctly claimed through sponge urban construction, by 70% rainfall on-site elimination and It utilizes；To the year two thousand twenty and the year two thousand thirty, the area that completed region of the city reaches sponge urban construction requirement will reach 20% and 80% respectively More than.

One of the core of sponge urban construction is exactly to promote low influence exploitation stormwater facility, and rainwater is developed in common low influence Facility includes Rain Garden, grass planting ditch, sunk type greenery patches, biological delaying basin, Rain-fed wetland, the wet pool of rainwater, planted roof etc..Rain Spray garden refers to vegetation based on shrub and flowers and plants, whole recessed or partially recessed small area greenery patchess, for collecting itself And the rainwater of neighboring area, it can temporarily be detained rainwater and utilize soil and plant purification rainwater, be provided simultaneously with certain landscape effect Fruit.Stormwater facility is developed in influence low compared to other, and Rain Garden function is more complete（Can stagnant storage rainwater, alleviate waterlogging influence, again Purifying rainwater can be retained, improve water body environment）, landscape it is preferable, along with floor space is small, few, the Ke Yiyin that is restricted factor Ground suiting measures to different conditions arrangement, therefore Rain Garden is the most popular a kind of technology of sponge urban construction.

As shown in Figure 1, the universal architecture of common Rain Garden includes aquifer 1（100~300 millimeters）, coating 2（50 ~80 millimeters）, planting soil layer 3（Planting soil layer thickness is determined by vegetation type, is not preferably less than 250 millis when using herbaceous plant Rice is not preferably less than 650 millimeters when using shrub）, hand-stuff layer 4（Hand-stuff layer thickness is about 300~500 millimeters, tool Body is determined by local Rainfall Characteristics and Rain Garden catchment area）, layer of sand 5（100~150 millimeters）, gravel layer 6（200~300 Millimeter）And overflow port 7 and draining blind pipe 8 etc..

The success or failure key of Rain Garden is to maintain the excellent permeability of overall structure, and the permeability of overall structure is main Strict requirements are proposed depending on planting soil layer and hand-stuff layer, therefore to the material of planting soil layer and hand-stuff layer, Such as《Jiangsu Province's Rain Garden construction and operation and maintenance guide》Middle regulation：" such as undisturbed soil permeance property is preferable（Infiltration coefficient is big In 36 mm hrs, i.e. 1 × 10-5 meter per seconds）, undisturbed soil can be used as planting soil layer；If undisturbed soil cannot be met the requirements, Improvement or direct soil removal and replacement can be carried out to undisturbed soil.The native main component and content for improveing or replacing are suggested as follows：Sand content 60%~75% is accounted for, organic component content accounts for 15%~20%, and clay content is no more than 10~20%；Such as using commercialization finished product, manufacture Value should be not less than 150 mm hrs, and 80 mm hrs are not less than after 3 years.”

Southern region of China clay distribution is extensive, especially Yangtze River Delta plains region, Pearl River Delta plains region, Yangtze-Huai Plain Area, topsoil is based on clay.The infiltration coefficient of clay is generally less than 5 × 10-9 meter per seconds, the infiltration system of silty clay Number is generally 5 × 10-9 ~ 5 × 10-8 meter per seconds；If according to requirements above, it is necessary to carry out improvement or direct to undisturbed soil Soil removal and replacement（The main sandy loam using commercialization finished product）, quantities is big, construction investment is high.Case above has seriously affected rainwater flower Construction and popularization of the garden in clay area.

Utility model content

The technical problems to be solved in the utility model be in view of the above shortcomings of the prior art, and provide it is a kind of be suitable for it is viscous The Rain Garden in soil area, should suitable for clay area Rain Garden can keep to rainwater delay, purification function while, It avoids changing or improve undisturbed soil on a large scale, effectively reduces construction investment and difficulty of construction, be conducive to Rain Garden in clay The popularization in area meets the general requirement that country promotes sponge urban construction.

In order to solve the above technical problems, the technical solution adopted in the utility model is：

A kind of Rain Garden suitable for clay area, including sleeve and lay successively from bottom to up gravel layer, thoroughly Water geotextiles, planting soil layer, coating and aquifer；The bottom of sleeve is vertically plugged in gravel layer, the top of sleeve with cover Flush at the top of cap rock, sleeve is interior to be filled with cobble.

Draining blind pipe is embedded in gravel layer, draining blind pipe is equipped with perforation, this is punched through connecting tube and vertical overflow Mouth is connected.

The bottom water outlet of vertical overflow port leads to Storm Sewer System or river.

The top heap of sleeve and cobble is equipped with landscape enrockment.

Cobble in sleeve forms several boulder beds, and each boulder bed is all made of earthwork grid package.

The grid aperture of earthwork grid is less than 10mm.

Sleeve is that diameter is managed in the UPVC of 300-600mm.

Gravel layer laying depth is more than 600mm, and the gravel diameter in gravel layer is 50-80mm.

The utility model with the above structure, has following significant effect：

1. the undisturbed soil conduct based on clay may be used while keeping to rainwater delay, purification function in the present invention Planting soil eliminates hand-stuff layer, avoids usually extensive soil removal and replacement or improves the way of soil, and cost reduces by 30% ~ 50%, Construction technology and difficulty of construction are also simplified and reduce simultaneously.

2. since periphery undisturbed soil is mainly clay, in addition gravel layer further thickens, water storage of the invention and water conservation energy Power is further enhanced；In the case where gravel layer thickness is more than 600 millimeters, the plant in Rain Garden generally need not be again It pours, the water storage of gravel layer is sufficient for the growth demand of plant.Therefore the present invention for based on clay, annual precipitation 800-900 Millimeter it is particularly suitable.

Description of the drawings

Fig. 1 shows the structural schematic diagram of Rain Garden in the prior art.

Fig. 2 shows a kind of structural schematic diagram of Rain Garden suitable for clay area of the utility model.

Wherein have：

1. aquifer；2. coating；3. planting soil layer；4. hand-stuff layer；5. layer of sand；6. gravel layer；7. vertical overflow Mouthful；8. draining blind pipe；9. bottom water outlet；10. permeable geotextiles；11. sleeve；12. cobble；13. landscape enrockment；14. connection Pipe；15. undisturbed soil.

Specific implementation mode

The utility model is described in further detail with specific better embodiment below in conjunction with the accompanying drawings.

As shown in Fig. 2, a kind of Rain Garden suitable for clay area, including sleeve 11 and lay successively from bottom to up Gravel layer 5, permeable geotextiles 10, planting soil layer 3, coating 2 and aquifer 1.

Above-mentioned gravel layer laying depth is preferably greater than 600mm, and generally 800-1000 millimeters, the gravel in gravel layer is straight Diameter is preferably 50-80mm.

Sleeve is preferably that diameter is managed in the UPVC of 300-600mm.

The bottom of sleeve is vertically plugged in gravel layer, top and the flush at the top of coating of sleeve, filling in sleeve There is cobble 12, forms cobble column.

Many places can be arranged in cobble column, at average 10-20 square metres of setting one.

Cobble in sleeve forms several boulder beds, and each boulder bed preferably uses earthwork grid to wrap up, geonet The grid aperture of lattice is preferably smaller than 10mm.

Draining blind pipe is embedded in gravel layer, draining blind pipe is equipped with perforation, this is punched through connecting tube and vertical overflow Mouth 7 is connected, and the bottom water outlet 9 of vertical overflow port leads to Storm Sewer System or river.

The preferred heap in periphery at the top and vertical overflow port of above-mentioned sleeve and cobble is equipped with landscape enrockment.

The process of construction of the application Rain Garden is as follows：After Rain Garden earth excavation to structural base designed elevation, first Laying draining blind pipe, is then laid with the gravel of 50 ~ 80 millimeters of diameter（The construction wastes such as the available broken brick of gravel replace）To setting Absolute altitude is counted, then UPVC pipes are installed（300-600 millimeters of caliber）, the cobble of 20 ~ 50 millimeters of diameter is used in combination（It can be replaced with gravel） Filling casing, finally construct successively permeable geotextiles, planting soil, planting soil layer, vertical overflow port and serike, and in casing Top and vertical overflow port periphery are banked up with the yellow levels of 30~120 millimeters of diameter with cobble, to improve landscape comfort level.

Since the suspended matter in rainwater can be trapped in the cobble column in casing, periodically cleaning for convenience can be with Cobble earthwork grid will be filled（Grid bore is less than 10 millimeters）It is wrapped up, layering is put into sleeve.

The operation logic of the application is as follows：

（1）During raining, surrounding ground rainwater is pooled to Rain Garden surface first, then by being seeped into gravel under cobble column Rock layers, the polluter in rainwater are retained by cobble column, and clean rainwater is accumulated in gravel layer；If charge for remittance is excessive, rainwater flower The water storage level in garden gradually rises, until being more than to be drained by vertical overflow port after normal pool level.

（2）After raining, by draining the draining of blind pipe, the water storage level of Rain Garden quickly falls to the top of gravel layer Portion avoids the plant influenced in Rain Garden from draining for a long time；The rainwater accumulated in gravel layer is made by the siphon of micropore in soil With can meet needed for the plant long term growth in Rain Garden.

Preferred embodiments of the present invention described in detail above, still, the utility model are not limited to above-mentioned reality Apply the detail in mode, in the range of the technology design of the utility model, can to the technical solution of the utility model into The a variety of equivalents of row, these equivalents belong to the scope of protection of the utility model.

Claims (8)

1. a kind of Rain Garden suitable for clay area, it is characterised in that：It lays successively including sleeve and from bottom to up Gravel layer, permeable geotextiles, planting soil layer, coating and aquifer；The bottom of sleeve is vertically plugged in gravel layer, sleeve Top and flush at the top of coating, sleeve is interior to be filled with cobble.

2. the Rain Garden according to claim 1 suitable for clay area, it is characterised in that：The row of being embedded in gravel layer Water blind pipe, draining blind pipe are equipped with perforation, this is punched through connecting tube and is connected with vertical overflow port.

3. the Rain Garden according to claim 2 suitable for clay area, it is characterised in that：The bottom of vertical overflow port Water outlet leads to Storm Sewer System or river.

4. the Rain Garden according to claim 1 suitable for clay area, it is characterised in that：The top of sleeve and cobble Heap is equipped with landscape enrockment.

5. the Rain Garden according to claim 1 suitable for clay area, it is characterised in that：Cobble in sleeve is formed Several boulder beds, each boulder bed are all made of earthwork grid package.

6. the Rain Garden according to claim 5 suitable for clay area, it is characterised in that：The grid hole of earthwork grid Diameter is less than 10mm.

7. the Rain Garden according to claim 1 suitable for clay area, it is characterised in that：Sleeve is diameter in 300- The UPVC of 600mm is managed.

8. the Rain Garden according to claim 1 suitable for clay area, it is characterised in that：Gravel layer laying depth is super 600mm is crossed, the gravel diameter in gravel layer is 50-80mm.