Drainage four-way inspection well to prevent water flow hedging

Abstract

The invention discloses a water drainage cross inspection well preventing water face-to-face flushing, belongs to the field of water drainage projects and particularly relates to a rainwater and sewage convergence water drainage structure. The well is an intersection inspection well applicable to a rainwater or sewage pipeline. Branch pipes on the two sides of a water drainage pipeline are connected into the inspection well through sluices with large cornering radius, the sluices of the branch pipes on the two sides are spaced from a sluice of an upstream pipeline, and the included angle of afflux of the three sluices is small. The inspection well can prevent face-to-face flushing of water entering the inspection well, reduce turbulence flow to stabilize the water and bring the water drainage efficiency of the intersection inspection well into full play, thereby reducing the frequency of waterlogging of urban roads.

Description

technical field [0001] The invention relates to a drainage four-way inspection well for preventing water flow from colliding, and belongs to the field of drainage engineering, in particular to a drainage structure for the confluence of rainwater and sewage. Background technique [0002] Urban rainwater drainage is generally organized drainage. The rainwater on the ground is collected and discharged to the rainwater pipe through the runoff, and then discharged into the natural water body through the rainwater pipe system. Most of the urban rainwater pipeline system is laid along the road, and the urban roads criss-cross. The rainwater from the units or residential areas on both sides of the road is connected to the urban rainwater pipeline through the three-way inspection well or the four-way inspection well. When designing urban rainwater pipelines, designers generally use standard drawings. For the four-way inspection well in the current national standard diagram "06MS201 ...

AI Technical Summary

Problems solved by technology

When the diameter of the main pipe is 900-2000mm, a rectangular four-way inspection well should be used. The flow groove of the rectangular four-way inspection well in the standard diagram is very small, and the fronts of the branch pipes on both sides are connected to the upstream main pipe at 90° relative to each other. The water flow is hedging and meets the upstream main water flow to form a strong turbulent flow. Even if the downstream main pipe is designed according to the flow rate of the upstream main pipe and the branch pipes on both sides, due to the large local head loss, the water flowing into the inspection well cannot be effectively discharged to the downstream pipes. Especially when the slope of one or both sides of the branch pipe is large, the flow velocity of the branch pipe is relatively high, and the turbulence phenomenon is more serious. The phenomenon that the downstream pipeline is not full flow

There is also a "T" connected three-way inspection well. The pipes are brought together to a point along the opposite direction, and then discharged to the downstream in the vertical direction. Generally, the four-way inspection well of the standard diagram is used to cancel the upstream main pipe. This kind of three-way Inspection well turbulence is also very serious

Lin Jinhai's article "The Influence of Local Loss of Rainwater Inspection Well on the Flow Capacity of Rainwater System" ("China Water Supply and Drainage", Issue 20, October 2010), made a study on the influence of local loss of inspection well on the flow capacity of the rainwater system. The actual water passing capacity caused by local loss can only reach 60% to 80% of the design flow

[0003] In the current standard diagram of the rectangular four-way inspection well, the turning radius at the center of the branch pipe launder on both sides is only about 1.5 times the pipe diameter. According to hydraulic requirements, the turning radius of the pipe channel should be 2.5 to 5.0 times the pipe diameter or channel width. times, the smaller turning radius is not conducive to the discharge of water, which is one of the reasons for the low drainage efficiency of the existing four-way inspection well

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