Green roof for regulating and controlling aiming at storm rainfall on waterproof roof in city

Abstract

The invention discloses a green roof for regulating and controlling aiming at the defects of high radial flow and pollution load yield of a hard roof in a city during rainy days. The green roof consists of a vegetable layer, a plant layer, a filter layer, a drain layer and a waterproof layer, wherein the vegetable layer comprises plants with strong capability of resisting drought stress and controlling nitrogen and phosphorus and is extensively managed; the planting layer is formed by mixing fly ash, porcelain granules and sandy loam or loamy sand; the filter layer comprises geotextile and waste sponge; and the drain layer consists of light filler. The green roof has the following advantages that the planted plants have strong survivability and are simply managed; nutrient substances in the planting layer have low background content, so that the phenomenon that nutrient salts are separate out caused by a leaching action during rainy days is avoided; the filter layer not only has a favorable capability of intercepting the granules, but also has stronger capabilities of absorbing and storing water; the drain layer consists of a waste rod brick and tile sheet, porcelain granules or slag with a certain mechanical strength; the green roof has small density; and in addition, the water quality of a radial flow of the green roof is further ensured by using an adsorption performance of the green roof.

Description

technical field [0001] The invention belongs to the technical fields of urban environment planning, environmental protection and green building, and specifically relates to the green roof technology. Background technique [0002] The ever-increasing pace of urbanization has rapidly changed the original land use mode, and the urban impermeable underlying surface has increased rapidly, which has brought great challenges to urban stormwater management. On the one hand, urban non-point source pollution caused by rainstorm erosion has become one of the important pollution sources of urban water environment; on the other hand, the low storm runoff interception rate of impermeable underlying surfaces has brought huge pressure on urban flood control. Urban building roofs account for about 40%-50% of urban impermeable underlying surfaces. Controlling the rainy day runoff and pollution of urban building roofs is of great significance to urban stormwater management. Green roof is an e...

AI Technical Summary

Problems solved by technology

[0006] Planting layer optimization is often prepared by adding organic matter, compost fertilizer or nutrient soil. This combination method inevitably faces the defect of nutrient salt precipitation due to leaching

[0007] (2) The use of water-retaining agent or water-retaining resin increases the construction cost:

[0008] In order to ensure that the green roof can have enough water to maintain the growth of plants during the drought period, and at the same time do not use watering to replenish water, adding water retaining agent is a common method at present, but this increases the construction cost

Images