What is the size of the rainwater outlet 05s5 18 in the General Atlas of Drainage?

Requirements for the construction of the rain mouth:

The rain mouth is connected with the inspection well of the street drainage pipeline through the connecting pipe. When the diameter of the drainage pipe is greater than 800mm, a connecting underground well can also be set at the joint between the connecting pipe and the drainage pipe instead of the inspection well.

The minimum pipe diameter of connecting pipes is 200mm, the slope is generally 0.0 1, the length is less than 25m, and the number of connecting pipes in series is less than 3.

The rainwater outlet is easily blocked by road garbage and sundries. In the design, the rainwater outlet of horizontal grate should be blocked by 50%, and the rainwater outlet of vertical grate should be blocked by 65,438+00%.

Extended data:

Rainwater outlet structure

The structure of the rain inlet includes three parts: water inlet grille, shaft and connecting pipe.

The entrance grille of the drainage outlet can be made of cast iron, reinforced concrete and stone. Using reinforced concrete or stone air intake grille can save steel, but its water intake capacity is far less than that of cast iron air intake grille. In some cities, in order to strengthen the water intake capacity of reinforced concrete or stone intake grates, the bottom of the side ditch of the rain outlet is lowered by several centimeters, but it causes inconvenience to traffic and may even lead to traffic accidents.

The direction of the water intake grate is also closely related to the water intake capacity. Grid parallel to the direction of water flow is better than vertical one. Therefore, in some places, water intake grates are designed to be criss-crossed to discharge rainwater flowing from different directions on the road surface.

Rainwater outlet shaft can be prefabricated by brick or reinforced concrete, and can also be made of top concrete pipe. Pollutant interception facilities should be set up at the rain mouth to reduce the insoluble pollutants generated by surface runoff from entering the receiving water body.

In order to avoid odor overflow from sewage, measures such as setting water seal or adding chemicals should be taken to prevent odor overflow from rainwater outlet of combined system.

Therefore, the depth of the rain outlet should not be greater than 1m generally, and sludge sedimentation tanks should be set up as needed. In case of special circumstances requiring shallow burial, reinforcement measures should be taken. In areas affected by frost heaving, the depth of the rain outlet can be determined according to local experience.

The bottom of the rain mouth can be made into a desilting well or a non-desilting well as required. The rain mouth with the mud sinking well can intercept the gravel carried by the rain and prevent it from entering the pipeline and causing siltation.

However, the mud sinking well often accumulates water, which breeds mosquitoes and flies, emits odor, affects environmental sanitation, and needs to be cleaned frequently, which increases the maintenance workload. Therefore, the rainwater outlet should be equipped with sewage interception facilities. Usually, only in the street or vegetable market with poor road surface and a lot of mud on the ground, the rainwater outlet with mud open caisson is considered.

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