Compound double-layer drainage inspection well for rainwater and sewage

Abstract

The invention provides a compound double-layer drainage inspection well for rainwater and sewage, which is used for a drainage system. A middle movable interlayer which can be opened and closed is arranged in the inspection well and divides the inspection well into an upper layer and a lower layer, wherein the upper layer is used for connecting a rainwater pipe duct and permits rainwater to pass, the lower layer is used for connecting a sewage pipe duct and permits sewage to pass, and the middle movable interlayer is provided with a vent pipe which is connected with the upper layer and the lower layer to realize the normal ventilation and the safe operation of the lower layer. Further, the middle movable interlayer also can be provided with a diversion closure structure, rainfall radial flow or road irrigation spray radial flow with small flow rate can be diverted to the lower layer and is introduced into the sewage pipe duct, and the function of diverting the rainwater radial flow of the initial period is realized. The inspection well can realize the connection of the rainwater pipe duct and the sewage pipe duct in a single inspection well, realizes the diversion closure and the effective control of the rainfall radial flow of the initial period, greatly reduces the pollution effect of the rainwater of the initial period, greatly reduces the number of the inspection wells in a system, saves the occupied land, has low manufacturing cost and operation and maintenance expense and does not have the pollution of overflow water.

Description

technical field [0001] The invention belongs to the technical fields of urban drainage systems and environmental protection, and in particular relates to inspection wells of drainage systems. Background technique [0002] The inspection well is a basic and key subsidiary structure in the urban drainage system. It is mainly installed at the turning point of the direction of the drainage pipe, the slope change of the drainage pipe, the section of the pipe, the foundation, the interface change, the intersection of the pipe, the straight line At certain distances on the pipes and channels and for special purposes (such as water drop, interception, overflow, etc.), it is used to realize the connection between drainage pipes and channels, and to facilitate the maintenance of pipes and channels. [0003] At present, there are two main types of drainage systems in the field of urban drainage: confluence system and diversion system. The former is to discharge rainwater and urban sewa...

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Problems solved by technology

[0004] (1) For the intercepting combined drainage system, the rainwater and sewage in the inspection well will mix with each other, especially when the rainfall exceeds the interception capacity of the downstream pipes and channels, the excess rain and sewage combined water needs to overflow, because the overflow water contains a large amount of Various forms of pollutants such as organic matter and suspended solids will cause serious pollution to the receiving water body, and when the drainage pipeline is far away from the water body of the river, lake, and pond, the laying of the overflow pipe and channel will also be difficult. It is inconvenient, and there is also the problem of difficult site selection for inspection wells

[0005] (2) For the separate drainage system, there is generally no rain and sewage mixing in the inspection wells, but on the one hand, the number of inspection wells will be greatly increased compared with the interception combined drainage system, which will greatly increase the investment in inspection wells, and It takes up a lot of street space, which brings great inconvenience to the setting of other types of pipeline wells, especially for towns with narrow streets and limited underground space, and the impact on traffic in daily maintenance also increases accordingly On the other hand, in practice, rain and sewage are often mixed, resulting in the fact that the diversion system inspection well becomes two combined inspection wells

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