CN202440921U - Drain open canal for controlling rainwater runoff of construction district by baffled processing - Google Patents

Abstract

The utility model discloses a baffle-type open drainage channel for controlling rainwater runoff in a building area, which comprises an open drainage channel body arranged under the green space of the building area or/and next to the road. One short side of the open channel body is provided with a water inlet, and the other short side is provided with a water outlet. A diversion corridor that is perpendicular to the external drainage ditch and connected end to end. The utility model prolongs the rainwater runoff route and delays the occurrence time of the peak value of the rainwater flow in the building community, delaying the influx of rainwater The time of the urban rainwater pipe network, thereby reducing the flood discharge pressure of the urban rainwater pipe network during heavy rains, and reducing the occurrence of urban waterlogging.

Description

An open drainage channel for diversion treatment and control of rainwater runoff in building districts

technical field

The utility model belongs to municipal drainage facilities, in particular to an open drainage channel for diversion treatment and control of rainwater runoff in building quarters.

Background technique

my country's annual precipitation is abundant. In recent years, with the continuous development of my country's urbanization, the proportion of permeable surface area has become smaller and smaller, and waterlogging caused by rainfall in various cities has also occurred continuously. Non-point source pollution has become a deteriorating urban water environment. one of the important reasons.

At present, the main technical measures to control non-point source pollution include Best Management Practices (BMPs) in the United States, Sustainable Drainage Systems (SUDS) in the United Kingdom, and Low Impact Development (LID) proposed by New Zealand. In the building area, LID technology can deal with non-point source pollution and control rainstorm runoff through rational use of landscape space. LID technology can control the runoff generated in the early stage of rainfall through decentralized and small-scale source control, which can effectively remove rainwater. Pollutants in runoff, reducing pressure on municipal sewer systems.

In my country, the main research direction of researchers is to promote infiltration at the source of rainwater runoff at the initial stage of rainfall, and improve the permeability of the soil to promote the smooth infiltration of rainwater and increase the retention time of runoff, thereby ecologically absorbing and retaining rainwater, reducing Surface runoff flow. For example, CN 1710211 A discloses "a method of landscape integrated intermittent wetland rainwater reuse", and CN 102090175 A discloses "a limited down-slope farming method for controlling erosion on sloping farmland". None of these patents involves extending the rainwater runoff route at the initial stage of rainfall, delaying the peak time of storm runoff, and increasing the residence time of rainwater in the building area, keeping the soil layer moist for a long time, which is prone to odor and hygiene such as mosquitoes and flies The problem, therefore, is that pollution control technologies for stormwater runoff should be carefully selected for residential areas with high sanitation conditions and landscape requirements.

Contents of the invention

The purpose of this utility model is to overcome the deficiencies of the prior art, and propose a drainage open channel for controlling the rainwater runoff in the building area by means of diversion, which can extend the route of the rainwater runoff in the building area, delay the occurrence time of the peak value of the rainwater flow, and delay the rainwater sink. The time it takes to flow into the urban rainwater pipe network, thereby reducing the pressure on the urban rainwater pipe network for flood discharge during heavy rains, and reducing the occurrence of urban waterlogging.       

The utility model relates to a baffle-type open drainage channel for controlling rainwater runoff in a building area, including an open drainage channel body arranged under the green space of the building area or/and next to the road. The surface of the open drainage channel body is rectangular and the ground is inclined. A water inlet is provided on one short side of the open drainage channel body, and a water outlet is provided on the other short side. Facing the overflow baffle of the water inlet of the open drainage ditch body, the other end of the external drainage ditch is connected with the outlet of the open drainage ditch body; the open drainage ditch body is provided with a plurality of baffle corridors perpendicular to the external drainage ditch and connected end to end One end of a plurality of end-to-end baffle corridors is connected to the water inlet of the open drainage channel body, and the other end is connected to the water outlet of the open drainage channel body. the

In the open drainage channel for controlling the runoff of rainwater in a building area by means of baffle, the height of the overflow baffle is 0.10m.

The above-mentioned open drainage channel for controlling the runoff of rainwater in building districts by means of deflection treatment is characterized in that the length L of the main body of the open drainage channel is 2.50 m, the width W is 1.00 m, the slope at the bottom is 0.5% to 1%, and the maximum depth is 0.15 m

The preferred solution is: ten baffle corridors perpendicular to the external drainage ditch and connected end to end are arranged in the open drainage ditch body, the width of the baffle corridors is 0.20m, the bottom slope is 0.5%-1%, and the maximum depth H is 0.15m, and the thickness b of the partition wall of the baffle corridor is 0.05m.

In the open drainage channel for controlling the runoff of rainwater in a building area by means of diversion treatment, the slope of the bottom of the external drainage ditch is 3% to 4%.

When it rains, the green space in the building area and the drainage ditches on both sides of the road collect the rainwater in the catchment area of the area. When the rainwater flows to the entrance of the baffle type open channel, it is blocked and flows into the main body of the open drainage channel along the slope. In the main body of the open drainage channel, the rainwater After ten back and forth diversions, it flows into the external drainage ditch next to it. When the rainwater flow is large, the baffle plate at the entrance of the open drainage channel body overflows to avoid excessive water accumulation at the entrance of the open drainage channel body. The overflowed rainwater is discharged downstream along the external gutter.

,雨水通过排水明渠的流速为0.43m/s,流量为0.012m³/s,因此，一个折流式排水明渠能够延缓雨水径流流量峰值出现时间24秒。 The utility model can extend the rainwater runoff route by 10m, and collect rainwater with a catchment area of ^500m2 . The width of a corridor inside the open drainage channel body is 0.20m, the maximum depth at the bottom is 0.15m, the roughness coefficient is 0.025-0.030, and the slope is 0.5%-1%. According to the Manning formula:

, The flow velocity of rainwater through the open drainage channel is 0.43m/s, and the flow rate is 0.012m ³ /s. Therefore, a baffled open drainage channel can delay the peak of rainwater runoff for 24 seconds.

，当以一年一遇的暴雨强度计算得出降雨径流量为0.01 m³/s，小于排水明渠本体的排水流量，排水明渠本体有足够处理暴雨的能力，且以30年一遇的暴雨强度计算得出降雨径流量为0.019 m3/s，大于排水明渠本体的排水流量，排水明渠本体中的径流流速和深度不会引起侵蚀。 According to the heavy rain intensity formula in Chongqing area

, when the rainfall runoff is 0.01 m ³ /s calculated based on the once-in-a-year rainstorm intensity, which is less than the drainage flow of the open drainage channel body, the open drainage channel body has sufficient capacity to handle the rainstorm, and the rainstorm intensity once in 30 years The calculated rainfall runoff is 0.019 m3/s, which is greater than the drainage flow of the open drainage channel body, and the runoff velocity and depth in the open drainage channel body will not cause erosion.

The utility model designs the baffle-type drainage open channel coordinated with the community's own drainage ditch next to the green building, the community green space and the road, and sets the number of baffle-type drainage open channels according to the catchment area of the community, thereby prolonging the rainwater drainage. The runoff route delays the peak time of rainwater flow in the building area and delays the time for rainwater to flow into the urban rainwater pipe network, thereby reducing the flood discharge pressure of the urban rainwater pipe network during heavy rains and reducing the occurrence of urban waterlogging. Build a drainage open channel body with a length of 2.5m and a width of 1.0m and 10 corridors inside, which can extend the rainwater runoff route by 10m and delay the peak time of the rainwater runoff flow for 24 seconds, achieving the purpose of rainwater runoff delay and pollution control ; The main body of the open drainage channel can be prefabricated, which is not only easy to construct, but also can coordinate with the landscape of the building community. the

Description of drawings

Fig. 1 is a plan view of the utility model;

Fig. 2 is the a-a sectional view of Fig. 1.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is described further.

Referring to Fig. 1 and Fig. 2, a baffle-type open drainage channel for controlling rainwater runoff in a building area includes an open drainage channel body arranged under the green space of the building area or/and next to the road. The part is inclined, and one short side of the open drainage ditch body is provided with a water inlet, and the other short side is provided with a water outlet; the inside of the open drainage ditch body is provided with an external drainage ditch 2 along a long side, and one end of the external drainage ditch is provided with Facing the overflow baffle 1 of the water inlet of the open drainage ditch body, the other end of the external drainage ditch is connected with the water outlet of the open drainage ditch body; ten baffles vertical to the external drainage ditch 2 and connected end to end are arranged in the open drainage ditch body Corridor 3, one end of the ten end-to-end baffle corridors is connected to the water inlet of the open drainage channel body, and the other end is connected to the water outlet of the open drainage channel body. the

The height of the overflow baffle 1 is 0.10m; the length L of the open drainage channel body is 2.50m, the width W is 1.00m, the bottom slope is 0.5%-1%, and the maximum depth is 0.15m; the baffle gallery The width of the channel 3 is 0.20m, the bottom slope is 0.5% to 1%, the maximum depth H is 0.15m, and the thickness b of the diversion corridor partition wall 4 is 0.05m; the bottom slope of the external drainage ditch 2 is 3% ~4%.

The utility model is coordinated with the self-owned drainage ditches of the building district. According to the water catchment area of the building district, the number of open drainage channels is determined, and the rainwater flows back and forth in the open drainage channels, so as to achieve the purpose of extending the rainwater runoff route. The main body of the open drainage channel can be prefabricated and laid on both sides of the road in the building area. The diversion corridor part is set under the green space, and the cover plate can be laid on the main body of the open drainage channel to coordinate with the plant landscape planted in the green area.

Taking a building community with an area of 10000m ² as an example, it is designed to set up 20 diversion-type drainage channels next to the green space and road drainage ditches in the community. m, the overflow baffle h is 0.10m, 10 corridors are built in, the corridor width B is 0.20m, and b is 0.05m. The rainwater is blocked at 1 and flows into 3. When the rainfall is large, the rainwater overflows through 1, and the overflowed rainwater flows into 2. The rainwater flowing out of 3 flows into 2 and is discharged downstream. One deflected drainage channel can delay the peak of rainwater runoff for 24 seconds, and twenty divergent drainage channels can delay the peak of rainwater flow in the building area by 8 minutes, delaying the influx of rainwater in the community into the urban rainwater pipe network The time is 8 minutes, which can effectively reduce the occurrence of urban waterlogging.

Claims (5)

1. A baffle-type open drainage channel for controlling the rainwater runoff in the building area, including an open drainage channel body arranged under the green space of the building area or/and next to the road. The upper part of the open drainage channel body is rectangular and the ground is inclined. One short side of one side is provided with a water inlet, and the other short side is provided with a water outlet. It is characterized in that: an external drainage ditch (2) is provided along a long side of the open drainage channel body, and one end of the external drainage ditch is provided with a positive For the overflow baffle (1) of the water inlet of the open drainage channel body, the other end of the external drainage ditch is connected with the water outlet of the open drainage channel body; the open drainage channel body is provided with a plurality of vertical and end-to-end Connected baffle corridors (3), one end of the plurality of end-to-end baffle corridors communicates with the water inlet of the open drainage channel body, and the other end communicates with the water outlet of the open drainage channel body. 2. A baffle type open drainage channel for controlling rainwater runoff in a building area according to claim 1, characterized in that: the height of the overflow baffle (1) is 0.10m. 3. According to claim 1 or 2, a baffle-type open drainage channel for controlling rainwater runoff in building quarters is characterized in that: the length L of the open drainage channel body is 2.50m, the width W is 1.00m, and the bottom slope is 0.5% to 1%, the maximum depth is 0.15m. 4. According to claim 1 or 2, a baffle-type open drainage channel for controlling rainwater runoff in a building area is characterized in that: the open drainage channel body is provided with ten vertical drains (2) connected end to end The diversion corridor (3), the width of the diversion corridor is 0.20m, the bottom slope is 0.5%~1%, the maximum depth H is 0.15m, and the thickness b of the diversion corridor partition wall (4) is 0.05m . 5. According to claim 1 or 2, a baffle-type open drainage channel for controlling rainwater runoff in building plots is characterized in that: the bottom slope of the external drainage ditch (2) is 3% to 4%.

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