Underground sewage pretreatment system connected into deep drainage tunnel

Abstract

The invention provides an underground sewage pretreatment system connected into a deep drainage tunnel, and belongs to the field of urban drainage. A water inlet unit in the system is used for being connected with a shallow drainage system; a lifting pump forebay in the lifting unit is connected with the water inlet unit, and a lifting pump is connected to a lifting pump water outlet pool through a pipeline; a low-position water outlet weir and a high-position water outlet weir are arranged at the outlet end of the lift pump water outlet tank and are switched by using a quick-closing switching gate; a treatment unit is used for filtering particulate matters in the sewage and introducing the pretreated sewage into the deep drainage tunnel through a water outlet unit; and an overflow pipe in an overflow lifting unit is connected with the water outlet unit through a first overflow gate, and when a downstream accident occurs, pretreated sewage is discharged through an overflow water outlet pipe by utilizing an overflow lifting pump. The underground sewage pretreatment system can still keep stable water yield under the condition that the water flow is large in rainy season and the like, is prevented from being flooded, and meets the normal operation working condition and various accident working conditions at the same time.

Description

Technical field [0001] The present invention is in the field of urban drainage, and more particularly, to a water pretreatment system for underground access deep drainage tunnel. Background technique [0002] With the rapid development of the city, for its drainage system drainage capacity requirements higher and higher, the surface of shallow space has been occupied by a variety of facilities and pipelines. There is a complex pipeline system expansion difficult, the new drainage system difficult issues such as the existing shallow underground drainage system, and subway and underground complex development also resulted in the shallow underground space available is very limited. Use of deep underground space to build large drainage tunnels to solve drainage problems become the choice of foreign developed cities, deep drainage tunnel can avoid a lot of land acquisition and resettlement, to avoid the impact on residential urban core area, and appropriate use of urban 30m-60m deep u...

AI Technical Summary

Problems solved by technology

[0005] In view of the defects of the prior art, the purpose of the present invention is to provide an underground sewage pretreatment system connected to a deep drainage tunnel, aiming to solve the problems of poor safety and prone to flooding accidents in the existing sewage pretreatment system

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