Urban tunnel drainage system based on sponge city concept

Abstract

The invention discloses an urban tunnel drainage system based on a sponge city idea, a water seepage road section with a certain length is arranged at a tunnel portal, the water seepage road section comprises a water seepage surface layer, a water seepage base layer and a soil layer from top to bottom, the water seepage surface layer is formed by paving water seepage concrete containing diatomite and water seepage concrete containing fly ash, and the water seepage surface layer is formed by paving water seepage concrete containing diatomite and water seepage concrete containing fly ash. The permeable base layer is in contact with soil through coarse aggregate. Water can be conveniently discharged to a roadbed and is not affected by capillarity to rise, the permeation rate can be effectively increased, and the problems that a traditional concrete gap structure is difficult to control and prone to blockage are solved. The problems of difficult drainage and easy water accumulation at the entrance of the urban underpass tunnel are solved in combination with a sponge urban drainage system, the problem of later disease recurrence can be avoided, and the treatment method is high in operability, safe and reliable and has good economic benefits.

Description

technical field [0001] The invention relates to the technical field of tunnel drainage, in particular to an urban tunnel entrance drainage system based on the concept of a sponge city. Background technique [0002] At present, domestic cities generally determine the diversion system as the drainage system of the urban drainage pipe network system in the stage of urban overall planning, and use it as the planning guidance basis for the construction and implementation stage. The interception combined system is only a transitional form in the construction process of the diversion system. Under the guidance of the planning, the urban drainage network system must eventually realize the diversion system. [0003] In recent years, due to the gradual increase of the environmental bearing pressure, when encountering drastic changes in the weather, it is easy to appear "waterlogging every rain, and drought after rain", which makes the urban water ecology face two extreme problems: on ...

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Problems solved by technology

[0003] In recent years, due to the gradual increase of the environmental bearing pressure, when encountering drastic changes in the weather, it is easy to appear "waterlogging every rain, and drought after rain", which makes the urban water ecology face two extreme problems: on the one hand, some cities have Potential safety hazards in rainy days, severe waterlogging during heavy rainfall, affecting urban development; on the other hand, most cities lack stable natural water resources, and water supply is seriously insufficient

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