CN207862013U - A kind of mixed fillers biology for solving collapsibility of loess is detained facility - Google Patents

Abstract

The mixed fillers biology that the utility model discloses a kind of for solving collapsibility of loess is detained facility, and facility includes water reserve, is coating below the water reserve, mixed filler layer, filter layer and gravel drainage blanket are followed successively by below coating；It is equipped with overflow well in the water reserve, PVC rainwater drainage pipes are equipped in overflow well；Running through in the gravel drainage blanket has the perforation PVC seepage pipes being connected in overflow well.The utility model is mixed using the optimization of the multimediums such as river sand, wood fragments bits, loess, have the characteristics that permeance property is good, facility should not block, facility filling settlement amount is small, realize that facilities design construction is simple is flexible, strong applicability to the high-efficient purification of the pollutants such as nitrogen phosphorus in runoff rainwater.

Description

A Mixed Fill Bioretention Facility Used to Solve the Collapsibility of Loess

technical field

The utility model relates to the technical field of runoff rainwater treatment, collection and utilization, in particular to a mixed filler biological retention facility for solving the collapsibility of loess.

Background technique

With the rapid development of the urban economy and the continuous advancement of the urbanization process, the number of impermeable underlying surfaces in the city continues to increase, and the problems related to rainwater control and management such as flood disasters, runoff pollution, and lower groundwater levels are becoming more and more serious. Urban waterlogging prevention and control and utilization of rainwater have become hot issues facing urban construction. Traditional rainwater drainage ideas that rely on large-scale infrastructure and pipe network construction can no longer meet the requirements of modern urban rainwater management. Sponge city construction that has emerged in recent years The concept advocates simulating natural conditions and using some micro-distributed ecological treatment technologies to control rainwater runoff at the source.

As one of the best management practices (BMPs) for urban stormwater, bioretention ponds (also known as rain gardens) can not only effectively reduce runoff and flood peaks, but also effectively improve the water quality of stormwater runoff. Bioretention technology can efficiently reduce rainwater runoff and control pollutant migration through evaporation and infiltration, and plays an irreplaceable role in controlling the total amount of urban rainwater runoff.

Foreign research on bioretention technology has gradually formed a relatively complete technical system after practical research and experience accumulation in recent years, but some design defects have also exposed some design defects that lead to poor water purification effects, poor runoff control effects, and blockages. , ground subsidence and other issues. The research shows that the packing permeability coefficient is the key factor affecting the storage capacity of the bioretention system.

Through data simulation and field experiments to study the filtration mechanism of bioretention facilities, it is found that when particulate matter is trapped by bioretention facilities, stratification will occur inside the filler, and fine soil particles will gather in the upper layer of the filler, while larger particles will stay in the lower layer of the matrix , leading to a decrease in the permeability of the filler, which in turn affects the normal function of the system. Relevant studies have also shown that the blockage of solid particles not only affects the water purification effect of the system, but also shortens the service life of the filler.

The construction of bioretention facilities should be adapted to local conditions, and should not be copied. For the application of bioretention facilities in Northwest China, local optimization and improvement of bioretention ponds should be carried out according to the climatic conditions and soil characteristics of Northwest China, its application in Northwest China should be promoted, and non-point source pollution and hydrological problems brought about by urbanization should be solved. question. The collapsible loess in Northwest China has the disadvantages of easy subsidence, poor permeability, and easy clogging when exposed to water. It is not suitable to be used as the internal filler of bioretention facilities alone. By adding a certain proportion of materials to the loess, not only is the construction convenient and easy, but it can also increase Its pollutant removal effect, enhanced permeability, slow down the clogging of facilities, prolong the service life of facilities, has certain economic benefits.

Utility model content

Aiming at the deficiencies of the existing technology and regional characteristics such as loess collapsibility and settlement causing blockage, a kind of mixed filler using loess, river sand and wood chips is provided, which has moderate permeability coefficient, small settlement, is not easy to block, and is convenient for construction management. , Runoff rainwater bioretention facilities with good nitrogen and phosphorus removal effects. The runoff rainwater enters the bioretention tank facility, filters some large particles through the covering layer, and then passes through the mixed packing layer to achieve the pollutant treatment and peak shifting effect of the runoff rainwater.

In order to achieve the above object, the utility model can take the following technical solutions:

A mixed packing bioretention facility for solving the collapsibility of loess, the facility includes a water storage area, the bottom of the water storage area is a covering layer, and the bottom of the covering layer is a mixed packing layer, a filter layer and a gravel drainage layer in sequence; An overflow well is arranged in the water storage area, and a PVC rainwater drainage pipe is arranged in the overflow well; a perforated PVC seepage pipe connected to the overflow well runs through the gravel drainage layer.

Among the above-mentioned technical solutions, the utility model also has a further limited solution:

Further, the depth of the water storage area is 20cm.

Further, the covering layer is formed by mixing bark, weeds and fallen leaves; the depth of the covering layer is 5cm.

Further, the mixed filler layer is formed by mixing loess, river sand and wood chips, and Ophiopogon japonicus or iris plants are planted in the mixed filler layer; the depth of the mixed filler layer is 50cm.

Further, the filter layer is filled with river sand to a depth of 10cm.

Further, the depth of the gravel drainage layer is 20cm, and 2-5cm of gravel is filled inside.

Further, the diameter of the perforated PVC seepage pipe is 10 cm, and the perforation diameter of the perforated PVC seepage pipe is 15 mm, and the holes are staggered.

Further, the overflow well is located from the water storage area to the bottom of the gravel drainage layer, and the top is 18-20 cm beyond the top of the covering layer. The PVC rainwater drainage pipe in the overflow well corresponds to the perforated PVC seepage pipe in the gravel drainage layer.

Further, one end of the PVC rainwater drainage pipe is located in the overflow well, and the other end is connected to an external municipal rainwater pipe network or a reclaimed water reuse facility. The diameter of the PVC rainwater drainage pipe is 15 cm.

By adopting the above-mentioned technical scheme, the beneficial effects of the utility model are: the bioretention facility of the utility model is especially suitable for the collapsible loess area in Northwest China. It is not suitable for clogging, and the settlement of the facility filler is small, so as to realize the efficient purification of pollutants such as nitrogen and phosphorus in the runoff rainwater. The design and construction of the facilities are simple and flexible, and the applicability is strong.

Description of drawings

Fig. 1 is the structural representation of the bioretention facility of the present utility model;

Labels in the figure: 1. water storage area; 2. cover layer; 3. mixed packing layer; 4. filter layer; 5. gravel drainage layer 5; 6. perforated PVC seepage pipe; 7. overflow well; 8. PVC rainwater drain pipe.

Detailed ways

In order to make the purpose, technical solutions and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model.

The utility model relates to a mixed filler biological retention facility for solving the collapsibility of loess.

As shown in Figure 1, the bioretention facility of the present invention includes a water storage area 1, a cover layer 2, a mixed packing layer 3, a filter layer 4, a gravel drainage layer 5, a perforated PVC seepage pipe 6, an overflow well 7 and PVC rainwater drainage Tube 8. Below the water storage area 1 is a cover layer 2, and below the cover layer 2 are a mixed packing layer 3, a filter layer 4 and a gravel drainage layer 5; an overflow well 7 is arranged in the water storage area 1, and the overflow well 7 is located in the From the water storage area 1 to the bottom of the gravel drainage layer 5, a PVC rainwater drainage pipe 8 is provided in the overflow well 7; the perforated PVC seepage pipe 6 connected to the overflow well 7 runs through the gravel drainage layer 5, and the overflow well 7 The PVC rainwater drainage pipe 8 corresponding to the perforated PVC seepage pipe 6 in the gravel drainage layer 5. The perforated apertures on the perforated PVC seepage pipe 6 are distributed in a staggered manner. One end of the PVC rainwater drainage pipe 8 is located in the overflow well 7, and the other end is connected to an external municipal rainwater pipe network or reclaimed water reuse facilities. Covering layer 2 is made of a mixture of bark, weeds and fallen leaves; mixed filling layer 3 is made of a mixture of loess, river sand and wood chips; mixed filling layer 3 is planted with waterlogging and drought-tolerant plants such as Ophiopogon japonicus or iris; filtering Layer 4 is filled with river sand, and gravel drainage layer 5 is filled with gravel.

In one embodiment, the water storage area 1 has a depth of 20 cm, the cover layer 2 has a depth of 5 cm, the mixed packing layer 3 has a depth of 50 cm, the filter layer 4 has a depth of 10 cm, and the gravel drainage layer 5 has a depth of 20 cm. gravel. The perforated PVC seepage pipe 6 pipe diameter is 10cm, and the perforation aperture on the perforated PVC seepage pipe 6 is 15mm. The top of the overflow well 7 is 18-20 cm beyond the top of the covering layer 2, and the diameter of the PVC rainwater drainage pipe 8 is 15 cm.

The working process of the utility model for treating rainwater runoff is as follows: the runoff rainwater first enters the water storage area of the biological retention facility, and the pollutants such as large particle suspended matter, nitrogen and phosphorus in the runoff rainwater pass through the covering layer 2 and the mixed packing layer 3 to filter, absorb, and microorganisms Nitrification and denitrification and assimilation of plants such as Ophiopogon japonicus and iris planted on the mixed filler layer 3 are eliminated. The treated runoff rainwater is collected in the gravel drainage layer 5 by the perforated PVC seepage pipe and enters the overflow well 7, and is collected and discharged through the PVC rainwater drainage pipe 8 connected to the overflow well 7.

The above-mentioned embodiments only express the implementation manner of the present utility model, and its description is relatively specific and detailed, but it should not be interpreted as limiting the patent scope of the present utility model. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the scope of protection of the utility model patent should be based on the appended claims.

Claims (9)

1. a kind of mixed fillers biology for solving collapsibility of loess is detained facility, it is characterised in that：Facility includes water reserve (1), be coating (2) below the water reserve (1), be followed successively by below coating (2) mixed filler layer (3), filter layer (4) and Gravel drainage blanket (5)；It is equipped with overflow well (7) in the water reserve (1), PVC rainwater drainage pipes (8) are equipped in overflow well (7)； Running through in the gravel drainage blanket (5) has the perforation PVC seepage pipes (6) being connected in overflow well (7).

2. the mixed fillers biology as described in claim 1 for solving collapsibility of loess is detained facility, which is characterized in that institute It is 20cm to state water reserve (1) depth.

3. the mixed fillers biology as described in claim 1 for solving collapsibility of loess is detained facility, which is characterized in that institute Coating (2) is stated to be mixed by bark, weeds and fallen leaves；Coating (2) depth is 5cm.

4. the mixed fillers biology as described in claim 1 for solving collapsibility of loess is detained facility, which is characterized in that institute It states mixed filler layer (3) to be mixed by loess, river sand and wood fragments bits, plantation Radix Ophiopogonis or iris in the mixed filler layer (3) Plant；Mixed filler layer (3) depth is 50cm.

5. the mixed fillers biology as described in claim 1 for solving collapsibility of loess is detained facility, which is characterized in that institute It states and inserts river sand, depth 10cm inside filter layer (4).

6. the mixed fillers biology as described in claim 1 for solving collapsibility of loess is detained facility, which is characterized in that institute It is 20cm, inside filling 2~5cm gravels to state gravel drainage blanket (5) depth.

7. the mixed fillers biology as described in claim 1 for solving collapsibility of loess is detained facility, which is characterized in that institute Perforation PVC seepage pipes (6) caliber is stated as 10cm, piercing aperture is 15mm, staggeredly trepanning in perforation PVC seepage pipes (6).

8. the mixed fillers biology as described in claim 1 for solving collapsibility of loess is detained facility, which is characterized in that institute State overflow well (7) and be located at water reserve (1) to gravel drainage blanket (5) bottom, top beyond at the top of the coating (2) 18~ 20cm, the PVC rainwater drainage pipes (8) in overflow well (7) are corresponding with perforation PVC seepage pipe (6) in gravel drainage blanket (5).

9. the mixed fillers biology as claimed in claim 8 for solving collapsibility of loess is detained facility, which is characterized in that institute It states PVC rainwater drainage pipes (8) one end to be located in the overflow well (7), municipal Storm Sewer Network or Treated sewage reusing outside another termination Facility, PVC rainwater drainage pipes (8) a diameter of 15cm.