Sponge city saline-alkali soil alkali discharge system

Abstract

The invention relates to a sponge city saline-alkali soil alkali discharge system. The sponge city saline-alkali soil alkali discharge system comprises a foundation, a blind pipe ditch, lower inverted filter layers, an alkali discharge blind pipe, a medium sand layer, an isolation layer, an upper inverted filter layer and a planting soil layer; the blind pipe ditch is of a long-strip-shaped structure and is excavated on the foundation; the lower inverted filter layers are laid on the upper surface of the foundation, and the bottom face and the slope face of the blind pipe ditch; a plurality of alkali discharge holes which are distributed in a dispersed manner are formed in the pipe wall of the alkali discharge blind pipe; and the pipe wall of the alkali discharge blind pipe is wrapped with an outer covering inverted filter layer; the alkali discharge blind pipe is laid in the blind pipe ditch in the length direction of the blind pipe ditch, and the middle sand layer is filled around the alkali discharge blind pipe in the blind pipe ditch; the isolation layer is graded broken stone laid on the lower inverted filter layer and the medium sand layer; the upper inverted filter layer is laid on the isolation layer; and the planting soil layer is laid on the upper inverted filter layer. According to the alkali discharge system, salt in soil can be drained away along with water, the underground water level is controlled to be below the critical depth, and the purposes of soil desalination and salinization prevention are achieved.

Description

technical field [0001] The invention relates to the technical field of alkali removal from saline-alkali land, in particular to an alkali removal system from saline-alkali land in a sponge city. Background technique [0002] The information disclosed in the Background of the Invention is only intended to increase the understanding of the general background of the invention, and is not necessarily to be taken as an acknowledgment or any form of suggestion that the information constitutes the prior art that is already known to those skilled in the art. [0003] Sponge city is a new generation of urban stormwater management concept. It means that the city can be like a sponge, which has good elasticity in adapting to environmental changes and responding to natural disasters caused by rain. When it rains, it can absorb, store, seep and purify water. , and "release" and use the stored water when needed, gradually improve and restore the city's natural ecological balance, so the s...

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Problems solved by technology

[0004] However, the inventors have found that in the process of building a sponge city, the site to be greened is a saline-alkali land. The soil pH value of the saline-alkali land is high, and the soil salt content is extremely high, and most of them are heavy saline soil and medium saline soil. It leads to poor plant growth environment. Therefore, how to make the salt in the soil drain away with precipitation while meeting the requirements of sponge city construction is an important issue in the construction of sponge cities.

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