CN214884908U

CN214884908U - Double-substrate-layer green roof structure designed aiming at local climate differentiation

Info

Publication number: CN214884908U
Application number: CN202120908208.9U
Authority: CN
Inventors: 梅国雄; 甘霖; 黄山; 蒋明杰; 吴文兵
Original assignee: Guangxi University
Current assignee: Guangxi University
Priority date: 2021-04-29
Filing date: 2021-04-29
Publication date: 2021-11-26
Anticipated expiration: 2031-04-29

Abstract

The utility model provides a two substrate layer green roof structure to local climate differentiation design, includes vegetable layer, two substrate layers, hinders root layer and waterproof layer, two substrate layers comprise upper and lower two parts, and its upper portion is planting layer, lower part for the modified soil of biological charcoal, the vegetable layer is planted on the upper portion of planting the layer, hinder the root layer setting in the modified soil's of biological charcoal lower part, the waterproof layer setting is hindering root layer lower part, and the waterproof layer lower part is laminated with naked roof mutually. In the area with rare rainfall, the double-matrix layer adopts the structural form that the thin planting layer is thickened with the biochar modified soil; in the areas with surplus rainfall, the double-matrix layer adopts a structural form of a thick planting layer and thin biochar modified soil. The utility model adopts double-substrate layer to cultivate plants and accumulate rainwater, and flexibly and with low cost, the green roof infiltration and accumulation adjusting function is achieved by adjusting the thickness distribution of the upper and lower substrate layers; the charcoal modified soil has strong water storage capacity, reduces the loss of soil nutrients, and is more environment-friendly and higher in durability.

Description

Double-substrate-layer green roof structure designed aiming at local climate differentiation

Technical Field

The utility model relates to a building engineering field, concretely relates to two base layer green roof structures to local weather differentiation design.

Background

The current continuous acceleration of urbanization process also means that the natural soil is less and less, and the impervious surface of city increases and causes the increase of urban internal diameter flow peak value, drainage pipe buffer time is short, and rainwater infiltration underground is more difficult etc. brings a series of problems such as urban waterlogging, water waste. In addition, the impervious surface replaces natural land, so that the urban 'heat island effect' is obviously enhanced, the risk of urban flood disasters is increased, and the urban livability is reduced. And the roof occupies a large proportion in the urban impervious surface, so that the roof runoff control is of great significance. At present, the green roof is generally considered to have the function of relieving negative effects such as urban waterlogging, heat island effect and the like in urban areas with the shortage of land resources and high difficulty in ecological environment recovery. The green roof makes full use of the impervious surface of the urban area and has the capability of intercepting and purifying rainwater.

The main component of the matrix of the traditional green roof structure is garden soil, which has high permeation rate, large bulk density, weak water storage capacity, easy nutrient loss, frequent watering, long-term additional fertilization after being put into use and higher operating cost. The thickness of the medium is relatively rigid, the climate difference and the rainfall characteristics of different areas cannot be considered, the thinner medium is mostly composed of a layer of soil, and although the medium has certain rainwater infiltration and storage capacity, the medium cannot flexibly accumulate rainwater and reduce runoff, cannot achieve good water storage effect, and cannot have the capacity of relieving urban waterlogging; thicker substrates meet the water retention requirements, but studies have shown that substrate runoff pollutants increase with increasing substrate thickness and increase roof loads. The common solution is to add a layer of water drainage and storage plate and other water storage structures under the soil layer, however, the defects of corrosion, aging, difficult maintenance and the like of the water drainage and storage plate exist.

CN105993569A discloses a double-substrate layer extended green roof structure with a nutrient substrate as an upper layer and an adsorption substrate as a lower layer, wherein the substrate improves the pollution adsorption capacity of the substrate and does not improve the water storage capacity of the green roof. The existing first-type green roof structure water storage and drainage adopts a commercial integrated formed water storage and drainage plate, and the reasonable distribution of water storage and drainage cannot be carried out; the water storage and drainage plate can not filter chemical fertilizers such as nitrogen and phosphorus in a planting soil layer, and chemical pollution is generated in the municipal pipeline or the natural flow. The growth substrate of the second type of green roof structure is prepared by adding modified materials such as fly ash and peat soil into garden soil and mixing the modified materials to achieve the purpose of improving the physical properties of the soil, and the growth substrate has certain water seepage and water retention capacity, but the outflow pollutants are increased, so that the water flowing out of the soil can be seriously polluted compared with the water quality of common garden soil. The third kind of green roof structure is some green roofs with double-substrate layers, the two-layer substrates of the roof are composed of nutrient substrates and adsorption substrates, and the emphasis is on adsorbing pollutants, but not on storing and draining water, and reducing runoff; the two-layer substrate laying of such green roof structures does not have a specific thickness distribution basis, and the two-layer substrate thickness distribution is not clear and flexible enough.

Disclosure of Invention

The to-be-solved technical problem of the utility model is that, the above-mentioned not enough that the green roof structure in area exists to different climatic differences and rainfall characteristics provides a two matrix layer green roof structure to local climate differentiation design.

The utility model discloses a solve the technical scheme that above-mentioned technical problem adopted and be:

the utility model provides a two substrate layer green roof structure to local climate differentiation design, includes vegetable layer, two substrate layers, hinders root layer and waterproof layer, two substrate layers comprise upper and lower two parts, and its upper portion is planting layer, lower part for the modified soil of biological charcoal, the vegetable layer is planted on the upper portion of planting the layer, hinder the root layer setting in the modified soil's of biological charcoal lower part, the waterproof layer setting is hindering root layer lower part, and the waterproof layer lower part is laminated with naked roof mutually.

According to the scheme, in the area with rare rainfall, the double-matrix layer adopts the structural form that a thin planting layer is thickened with biochar modified soil (water storage layer); in the areas with surplus rainfall, the double-matrix layer adopts a structural form of a thick planting layer and thin biochar modified soil.

According to the scheme, the ratio of the thickness of the biochar modified soil to the thickness of the double-matrix layer is selected from 0.3-0.7 according to the climate difference and rainfall characteristics of different regions.

According to the scheme, the planting layer adopts a commercial green roof growth substrate, namely common planting soil.

According to the scheme, the vegetation layer adopts sedum lineare which is a perennial herb of Crassulaceae.

According to the scheme, the root-resisting layer is made of polyurethane sheets.

According to the scheme, the waterproof layer is made of high polymer modified asphalt waterproof coiled material, and the thickness of the waterproof coiled material is 2-4 mm.

Compared with the prior art, the utility model discloses following beneficial effect has:

1. combining the climate difference and rainfall characteristics of different areas, adopting two layers of soil with double substrate layers to cultivate plants and accumulate rainwater, and adopting different soil layer thickness distribution in different areas: for the area with rare rainfall, the water consumption for meeting the growth requirement of vegetation is taken as the main design purpose; for areas with surplus rainfall, the runoff time is delayed, and the municipal pipeline pressure is reduced; based on the characteristics, the structural form of the thin planting layer and the thick modified soil aquifer and the structural form of the thick planting layer and the thin modified soil aquifer are respectively adopted; aiming at the climatic characteristics of different regions, the green roof infiltration and storage regulation function is flexibly achieved at low cost by adjusting the thickness distribution of the upper and lower layers of substrate layers;

2. the utility model has the characteristics of the two substrate layers, wherein the permeability of the upper planting soil is good, which is beneficial to the growth of plants; the lower layer adopts biochar to modify soil, and currently, biochar modified soil is not used as a green roof substrate for storing water or filtering pollutants; the utility model discloses mix the biochar with planting soil and obtain biochar modified soil, the soil after utilizing the biochar modification has higher water retention performance, and biochar modified soil permeability is lower, and light in weight can effectively filter nitrogen, phosphorus etc. keeps fertile performance, reduces soil nutrient loss, and is stronger than other green roof water-retaining ability, more environmental protection, the durability is higher;

3. the biochar modified soil is used on a green roof, the substrate is used as a water storage layer and a filter layer of the green roof, and a commercial integrated forming water storage and drainage plate is replaced, so that the structural form of the green roof is improved, the effect of storing and collecting more rainwater is achieved, and pollution and roof load increase caused by the water storage and drainage plate are avoided.

Drawings

Fig. 1 is a cross-sectional view of a geological situation applicable to a karst area having connectivity channels in accordance with an embodiment of the present invention;

in the figure, 1 is a vegetation layer, 2 is common planting soil, 3 is biochar modified soil, 4 is a root-resistant layer, 5 is a waterproof layer, and 6 is a roof.

Detailed Description

The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings.

As shown in fig. 1, according to the utility model discloses embodiment's two basal layer green roof structure to local climate differentiation design, including vegetable layer, two basal layers, root-resistant layer and waterproof layer, two basal layers comprise upper and lower two parts, and its upper portion is for planting the layer, the lower part is the modified soil of biological charcoal 3, and the upper portion of planting the layer is planted vegetable layer 1, and the lower part of the modified soil of biological charcoal 3 is provided with root-resistant layer 4, and root-resistant layer 4 lower part is provided with waterproof layer 5, and waterproof layer 5 is laminated with naked roof 6 mutually.

In the area with rare rainfall, the double-substrate layer adopts the structural form that the thin planting layer is thickened with the biochar modified soil (water storage layer), so that the main design purpose of water required by vegetation growth can be met, the redundant rainwater after rainfall is stored in the modified soil water storage layer after passing through the planting layer, and the outflow is reduced; during dry seasons, the stored water can be evaporated from the lower modified soil aquifer to the vegetation layer 1 for the growth of plants.

In the area with surplus rainfall, the double-substrate layer adopts the structural form of adding the thin biochar modified soil to the thick planting layer, so that the runoff delay time can be met, the main design purpose of reducing the pressure of municipal pipelines can be met, the plant growth requirement is met through the water storage of the planting layer, and meanwhile, the generation time of the bottom runoff is delayed by utilizing the modified soil layer with lower permeability, and the runoff is controlled.

The proportion of the thickness of the biochar modified soil to the thickness of the double-matrix layer is selected from 0.3-0.7 according to the climate difference and rainfall characteristics of different regions.

The planting layer adopts a commercial green roof growth substrate, namely common planting soil 2.

The vegetation layer 1 is made of sedum lineare which is a perennial herb of Crassulaceae, is a green grass with good drought resistance and extremely light load.

The root-resistant layer 4 adopts a polyurethane sheet, the waterproof layer 5 adopts a high polymer modified asphalt waterproof coiled material, and the thickness is 3 mm.

Particularly, the green roof double-substrate layer formed by the common planting soil 2 and the biochar modified soil 3 combines the climate difference and rainfall characteristics of different regions, and adopts a structural form of carrying out proportional layered thickness distribution on the basis of the designed rainfall corresponding to the annual runoff total amount control rate of different cities, so that the green roof seepage and storage regulation function can be flexibly achieved according to the climate difference of different regions.

It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are considered to be within the scope of the invention as defined by the following claims.

Claims

1. A two substrate layer green roof structure to local climate differentiation design which characterized in that: the biological carbon modified soil planting layer comprises a vegetable layer, a double-substrate layer, a root-blocking layer and a waterproof layer, wherein the double-substrate layer comprises an upper part and a lower part, the upper part of the double-substrate layer is a planting layer, the lower part of the double-substrate layer is biological carbon modified soil, the vegetable layer is planted on the upper part of the planting layer, the root-blocking layer is arranged on the lower part of the biological carbon modified soil, the waterproof layer is arranged on the lower part of the root-blocking layer, and the lower part of the waterproof layer is attached to a naked roof.

2. The dual substrate layer green roof structure designed for regional climate differentiation according to claim 1, characterized in that: in the area with rare rainfall, the double-matrix layer adopts the structural form that the thin planting layer is thickened with the biochar modified soil; in the areas with surplus rainfall, the double-matrix layer adopts a structural form of a thick planting layer and thin biochar modified soil.

3. The dual substrate layer green roof structure designed for regional climate differentiation according to claim 2, characterized in that: the proportion of the thickness of the biochar modified soil to the thickness of the double-matrix layer is selected from 0.3-0.7 according to the climate difference and rainfall characteristics of different regions.

4. The dual substrate layer green roof structure designed for regional climate differentiation according to claim 1, characterized in that: the planting layer adopts a commercial green roof growth substrate, namely common planting soil.

5. The dual substrate layer green roof structure designed for regional climate differentiation according to claim 1, characterized in that: the vegetable layer is made of sedum lineare which is a perennial herb of Crassulaceae.

6. The dual substrate layer green roof structure designed for regional climate differentiation according to claim 1, characterized in that: the root-resisting layer is made of polyurethane sheets.

7. The dual substrate layer green roof structure designed for regional climate differentiation according to claim 1, characterized in that: the waterproof layer is made of high polymer modified asphalt waterproof coiled materials, and the thickness of the waterproof coiled materials is 2-4 mm.