Rainwater drainage ditch

Abstract

The invention discloses improvement on a rainwater drainage ditch. The rainwater drainage ditch is characterized in that a ditch-type rainwater channel consists of two homodromous reversed trapezoid trenches of different sizes, the two homodromous reversed trapezoid trenches are communicated with each other, the large homodromous reversed trapezoid trench is arranged on the upper part, and the small homodromous reversed trapezoid trench is arranged on the lower part. A water excess section is a reversed trapezoid of which the cross section is linearly increased according to the change of the height, and a section combined with two reversed trapezoids of which the upper parts are large and the lower parts are small is adopted, so that a large amount of rainwater and a small amount of rainwater can be drained separately; due to water drainage through the reversed trapezoid of which the lower part is small, the water drainage section is relatively small when the rainwater amount is small; therefore, the water drainage flow speed can be increased; by the enough water drainage flow speed, accumulation of pollutants in the rainwater ditch can be reduced; when the rainwater amount is small, the probability and amount of sludge deposition are reduced, and the self-cleaning capacity of the rainwater ditch is improved; moreover, due to the lower small section, the water consumption for flushing the sludge is reduced; meanwhile, the upper large section and the section are linearly increased along with the increase of a water level, so that the requirement on quick water drainage in a heavy rainstorm within short time can be met; and the shortcomings of the rainwater drainage ditch in the prior art are completely overcome.

Description

technical field [0001] The invention is an improvement to the rainwater drainage ditch, and in particular relates to a rainwater drainage ditch which can effectively solve the siltation caused by small rainfall and low flow velocity, and can linearly increase the cross section during heavy rain to realize rapid drainage. Background technique [0002] The annual rainfall in most areas of my country is unevenly distributed over time, and most of the annual rainfall is concentrated in summer, and it is often heavy rain or torrential rain, thus forming a large amount of surface runoff. At present, in addition to the point-shaped rainwater collection system, there is also a gutter-type linear rainwater collection system for collecting rainwater. The latter has a stronger water collection capacity than the former, and has become the mainstream rainwater collection system. The cross-section design of traditional gutter-type rainwater canals is usually determined according to the fl...

AI Technical Summary

Problems solved by technology

The cross-section design of traditional gutter-type rainwater canals is usually determined according to the flow-through requirements of the maximum storm intensity, taking into account different rainfall intensities and flow velocities. Therefore, most of them adopt rectangular cross-sections and are made of bricks or concrete pouring. This structural rainwater canal has the following disadvantages: 1. , Brick or concrete pouring rainwater ditches, the inner wall surface is rough, and stagnation occurs on the rough surface, which will not only reduce the flow rate of the water, especially when the rainfall intensity is small, the liquid level in the rainwater ditch is shallow, and the water flow rate is slower, which is easy to cause rainwater erosion Pollutants brought in from the road are deposited in the storm drain, and some fibers, plastic paper and other sundries with a certain surface volume will be hooked on the rough surface, so that the cross section of the storm drain will be greatly reduced after a long time, affecting heavy rain or The overflow section in the channel during heavy rain causes heavy rain or the drainage is not open during heavy rain; 2. Although the rainwater canal can be flushed after a certain period of time to discharge the deposited sludge, but because the rectangular section is relatively large, it will greatly increase 3. When the rainfall intensity is high, because the width of the channel with a rectangular cross-section is the same, heavy rain or heavy rain will increase the water level in the storm drain, and the increase in water level is related to the amount of rainfall. It increases linearly, but the water passing area does not increase linearly (the horizontal width of the water passing section remains unchanged, and the increase value of the water passing section is only proportional to the water depth), so the increase of the water passing area is limited, which hinders rapid discharge during heavy rain or rainstorm. Therefore, it is very easy to cause serious water accumulation on the ground in a short period of time during heavy rain or heavy rain, forming short-term floods on the road surface and causing traffic jams

[0008] In the above-mentioned prior art, the cross section of the drainage channel basically remains unchanged, but the rectangular flat bottom is changed to an arc shape, and the prefabricated form is adopted, which only solves the problem that the inner wall surface of the rainwater channel is not smooth, and other shortcomings such as low rainfall and low flow velocity bring The problem of siltation and the fact that the cross-section cannot increase linearly during heavy rain or heavy rain, the problem of achieving rapid drainage still exists

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