CN116770951A - A rainwater drainage system that prevents backflow - Google Patents

Abstract

The invention discloses a rainwater drainage system that prevents backflow, including a drainage ditch and a drainage outlet unit. A control valve is provided at the outlet of the drainage pipe in the drainage outlet unit. The control valve includes a spherical valve core. When the river water level is lower than the sink, When the water level in the pool is high, the control valve automatically opens the camera to drain water to avoid water accumulation on the ground. When the river water level is higher than the water level in the catchment pool, the control valve automatically closes to prevent river water backflow. No manual operation is required, which reduces operating costs. It can drain the camera and improve the drainage effect. ; The outlet well of the drainage outlet unit is set below the design water level of the river, which does not affect the river landscape and avoids the erosion of the river slope by the water flow; grass filter belts and shrub filter belts are planted on the surface and both sides of the drainage ditch, which is Rainwater pollutants are filtered, reducing rainwater pollution to rivers.

Description

A rainwater drainage system that prevents backflow

Technical field

The invention relates to the fields of municipal engineering and water conservancy engineering, and in particular to a rainwater drainage system that prevents backflow.

Background technique

At present, in urban suburbs and rural areas in plain areas, most rainwater drainage adopts the buffer drainage mode of "nearby, dispersed, and self-flowing into the river", which collects runoff from the ground, roads, etc., and uses the drainage ditch system to collect it at the drainage outlet. The bulls drain the nearby artesian water into the river. There are a large number of such rainwater drainage outlets on both sides of the river, and the bottom elevation of the drainage ditch is usually lower than the highest water level of the river. This often causes backflow when the water level of the river is high, or accumulation of water that cannot be discharged. In order to prevent the backflow of river water, it needs to be controlled through gates. However, when it rains heavily and needs to be drained in time, the gates cannot be opened in time and the accumulated water cannot be drained out in time. Therefore, it is inconvenient to control the discharge of rainwater through gates. Secondly, the current drainage outlet structures are usually installed in There are gaps in the river revetment or slope, resulting in a poor landscape effect of the river revetment or slope; in addition, rainwater is directly discharged into the river through drainage ditches, and the sediment in the rainwater falls down, causing pollution to the river. The solutions to problems such as river backflow, poor landscape effects at water outlets, and sediment discharge into rivers require technological innovation.

Contents of the invention

In view of the shortcomings in the existing technology, this application provides a rainwater drainage system that prevents backflow, that is, rainwater self-drains into the river and prevents backflow structures and control methods, so as to realize that rainwater discharged into the river can automatically drain and independently prevent backflow. The goal is to solve the problems of poor landscape effect at the outlet and discharge of sediment into the river.

In order to achieve the above object, the present invention provides the following technical solution, a drainage structure to prevent backflow, including a drainage ditch and a drainage outlet unit. The drainage ditch is arranged on the bank of the river to collect ground rainwater. The drainage ditch is provided with There are multiple drainage outlet units. The drainage outlet unit includes a catchment tank, a drainage pipe, an outlet well and a control valve. The catchment pool is arranged in the drainage ditch to collect rainwater collected by the drainage ditch. The outlet well is arranged in the river channel. On the slope, the water inlet of the drainage pipe is arranged on the inner wall of the water collection tank, the water outlet of the drainage pipe is arranged in the well of the outlet well, and the water outlet of the drainage pipe is provided with the Control valve, the outlet well is used to fix the drainage pipe and support the control valve;

The control valve includes a curved straight pipe, a valve seat, a valve core, a valve body, a valve library and a water outlet pipe. The inner diameter of the curved straight pipe is the same as the inner diameter of the drainage pipe. One end of the curved straight pipe is the same as the drainage pipe. The other end of the curved straight pipe is vertically upward and connected to the lower end of the valve seat. The valve seat is a hollow conical pipe with a wide top and narrow bottom. The upper end of the valve seat is connected to the valve seat. body connection, the valve body is a cylindrical tube, the inner diameter of the valve body is the same as the inner diameter of the upper end of the valve seat, the valve body is provided with a spherical valve core, the specific gravity of the valve core is greater than the specific gravity of water, the valve core The outer diameter is greater than the minimum inner diameter of the valve seat, the water outlet pipe is provided on the pipe wall of the valve body, the water outlet pipe is located in the well of the outlet well, the upper part of the valve body is connected to a valve library, the The valve bank is a pipe with a narrow top and a wide bottom, and the upper end of the valve bank is closed.

In one embodiment, grass filter strips are planted on the surface of the drainage ditch, and shrub filter strips are planted on both sides of the drainage ditch.

In one embodiment, the cross-section of the drainage ditch is in the shape of an inverted parabola. The drainage ditch is provided with a plain soil layer, a gravel layer and a planting soil layer from bottom to top. The grass filter belt is planted on the planting soil layer. On the layer, a seepage pipe is provided in the gravel layer, a plurality of seepage holes are provided on the outer periphery of the seepage pipe, and the outer periphery of the seepage pipe is wrapped by geotextile.

In one embodiment, the valve core is a hollow ball made of stainless steel or plastic. Sand is provided inside the valve core. Several through holes are provided on the upper end surface of the valve library. The weight of the sand can be adjusted. .

In one embodiment, a waste barrier is provided at the connection between the water catchment tank and the drainage ditch.

In one embodiment, the water collecting tank is a square empty box well made of concrete or plastic, and a movable cover is provided on the top of the water collecting tank.

In one embodiment, the water inlet of the drainage pipe is provided on the side wall of the water collecting tank, and the height of the bottom of the water collecting tank is 200 mm lower than the height of the water inlet of the drainage pipe.

In one embodiment, a support member is provided in the middle of the drainage pipe.

In one embodiment, the top of the outlet well is open and provided with a pollution barrier.

In one embodiment, the height of the outlet well is lower than the design water level of the river.

Compared with the existing technology, the beneficial effects in this application are:

The anti-backflow rainwater drainage system in this application includes a drainage ditch and a drainage outlet unit. A control valve is set at the outlet of the drainage pipe in the drainage outlet unit. The control valve includes a spherical valve core. When the river water level is lower than the water level of the catchment pool, , the control valve automatically opens the camera to drain water to avoid water accumulation on the ground. When the river water level is higher than the water level of the catchment pool, the control valve automatically closes to prevent river water backflow. No manual operation is required, which reduces operating costs. It can drain the camera and improve the drainage effect; the drainage outlet The outlet well of the unit is set below the design water level of the river, which does not affect the river landscape and avoids the erosion of the river slope by water flow; grass filter belts and shrub filter belts are planted on the surface and both sides of the drainage ditch respectively to prevent rainwater pollution. The water is filtered to reduce the pollution of rivers caused by rainwater.

Description of drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application and therefore do not It should be regarded as a limitation of the scope. For those of ordinary skill in the art, other relevant drawings can be obtained based on these drawings without exerting creative efforts.

Figure 1 is a schematic plan view of the rainwater drainage system for preventing backflow in the embodiment of the present application;

Figure 2 is a schematic plan view of the drainage outlet unit in the embodiment of the present application;

Figure 3 is a schematic cross-sectional view of the drainage outlet unit in the embodiment of the present application;

Figure 4 is a schematic cross-sectional view of the drainage ditch in the embodiment of the present application;

Figure 5 is a schematic cross-sectional view of the drainage outlet unit in the drainage state in the embodiment of the present application;

Figure 6 is a schematic cross-sectional view of the drainage outlet unit in the anti-backflow state in the embodiment of the present application;

Figure 7 is a schematic diagram of the control valve in the embodiment of the present application.

Reference signs:

1. Drainage ditch; 101. Grass filter belt; 102. Shrub filter belt; 103. Plain soil layer; 104. Gravel layer; 105. Planting soil layer; 106. Seepage pipe; 2. Drainage outlet unit; 201. Catchment tank ; 202. Drainage pipe; 203. Outlet well; 204. Control valve; 2041. Bent straight pipe; 2042. Valve seat; 2043. Valve core; 2044. Valve body; 2045. Valve library; 2046. Outlet pipe; 205. Support 206. Waste rack; 207. Movable cover; 3. Dam; 301. Outer slope; 302. Inner slope; A. Water level in the catchment pool; B. Water level in the river.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments These are part of the embodiments of this application, but not all of them. The components of the embodiments of the present application generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations.

Accordingly, the following detailed description of the embodiments of the application provided in the appended drawings is not intended to limit the scope of the claimed application, but rather to represent selected embodiments of the application. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of this application.

As shown in Figures 1-7, this embodiment discloses a rainwater drainage system that prevents backflow, including a drainage ditch 1 and a drainage outlet unit 2. The drainage ditch 1 is installed on the bank of the river to collect ground rainwater, as shown in Figure 1 As shown, a plurality of drainage outlet units 2 are provided on the drainage ditch 1. The drainage outlet unit 2 includes a catchment tank 201, a drainage pipe 202, an outlet well 203 and a control valve 204. The catchment pool 201 is arranged in the drainage ditch 1, and the drainage outlet unit 2 collects For the rainwater collected by the drainage ditch 1, the outlet well 203 is set on the slope of the river, the water inlet of the drainage pipe 202 is set on the inner wall of the catchment pool 201, the outlet of the drainage pipe 202 is set in the well of the outlet well 203, and the drainage pipe 202 A control valve 204 is provided at the water outlet, and the outlet well 203 is used to fix the drainage pipe 202 and support the control valve 204.

As shown in Figures 5, 6, and 7, the control valve 204 includes a curved straight pipe 2041, a valve seat 2042, a valve core 2043, a valve body 2044, a valve library 2045, and an outlet pipe 2046. The inner diameter of the curved straight pipe 2041 is the same as that of the drain pipe 202. The inner diameters are the same. One end of the curved straight pipe 2041 is connected to the outlet of the drainage pipe 202. The other end of the curved straight pipe 2041 is vertically upward and connected to the lower end of the valve seat 2042. The valve seat 2042 is a hollow conical pipe with a wide top and a narrow bottom. The upper end of the valve seat 2042 is connected to the valve body 2044. The valve body 2044 is a cylindrical tube. The inner diameter of the valve body 2044 is the same as the inner diameter of the upper end of the valve seat 2042. A spherical valve core 2043 is provided in the valve body 2044. The specific gravity of the valve core 2043 is greater than that of water. The specific gravity of the valve core 2043 can float on the water. The outer diameter of the valve core 2043 is greater than the minimum inner diameter of the valve seat 2042. An outlet pipe 2046 is provided on the wall of the valve body 2044. The outlet pipe 2046 is located in the well of the outlet well 203. The valve The upper part of the body 2044 is connected with a valve library 2045. The valve library 2045 is a pipe that is narrow at the top and wide at the bottom. The upper end of the valve library 2045 is closed. The valve core 2043 is a hollow ball, made of stainless steel or plastic. In order to control the weight of the valve core 2043, drill a hole in the ball shell of the valve core, put in an appropriate amount of sand, and then seal the hole, which is the sand in the valve core 2043. The weight can be adjusted. The upper end surface of the valve library 2045 is provided with several through holes to ventilate the valve body and reduce the buoyancy of the valve library. The function of the valve library 2045 is to place the valve core 2043 when the valve core 2043 rises to prevent the valve core from escaping. In this embodiment, the specific gravity of the valve core 2043 is slightly greater than the specific gravity of water by adjusting the weight of the sand.

The control valve 204 in this embodiment uses a spherical valve core 2043 and a valve seat 2042 that is wide at the top and narrow at the bottom to form a control valve. Its working principle is to use the self-weight of the valve core 2043 and the difference in internal and external water pressure to complete the opening and closing of the control valve. That is, the water pressure promotes the lifting and lowering of the valve core 2043 to realize automatic opening and closing of the control valve.

As shown in Figure 1-3, there is a dike 3 on the bank of the river. The slope on the dike close to the river is defined as the outer slope 301. The slope on the dike away from the outside of the river is called the inner slope 302. The drainage ditch 1 is close to the inner slope. The slope 302 and the outlet well 203 are arranged on the outer slope 301. The direction of the drainage ditch 1 is consistent with the direction of the river. The drainage ditch 1 can be a straight line, a curve or a broken line. As shown in Figure 4, in order to filter and purify fine particles such as dust in the air, vehicle exhaust, and pollutants washed on the road carried in the initial rainwater (usually refers to the surface runoff formed by the first 10 to 15 minutes of rainfall), this embodiment A grass filter belt 101 is planted on the surface of the middle drainage ditch. In order to intercept larger pollutants from entering the drainage ditch 1, shrub filter belts 102 are planted on both sides of the drainage ditch. The drainage ditch 1 is provided with plain soil layers from bottom to top. 103. Gravel layer 104 and planting soil layer 105. The grass filter belt 101 is planted on the planting soil layer 105. A seepage pipe 106 is provided in the gravel layer 104. A plurality of seepage holes are provided around the periphery of the seepage pipe 106. Wrapped in the geotextile, the rainwater collected by the drainage ditch is filtered through the grass filter belt 101, the planting soil layer 105, the gravel layer 104, etc., passes through the geotextile and enters the seepage pipe 106 through the seepage hole, and passes through the seepage pipe 106 to the water catchment tank 201. The drainage ditch 1 is a shallow drainage ditch. In this embodiment, the cross-section of the drainage ditch 1 is an inverted parabola. The slope of the ditch wall of the drainage ditch 1 is less than or equal to 1:3. In other embodiments, the cross-section of the drainage ditch 1 can be triangular or trapezoidal. .

A sewage barrier 206 is provided at the connection between the catchment pool 201 and the drainage ditch 1 to block floating objects outside the sump 201 . The sewage barrier 206 of the catchment pool 201 is a vertical sewage barrier. The catchment pool 201 is a square empty box well made of concrete or plastic. The top of the catchment pool 201 is provided with a movable cover. In order to increase the anti-corrosion capability of the movable cover and make the catchment pool 201 more beautiful, the movable cover is made of fiberglass In this case, the water inlet of the drainage pipe 202 is arranged on the side wall of the catchment tank 201, and the bottom of the catchment pool 201 is lower than the water inlet of the drainage pipe 202. In this embodiment, the height of the bottom of the catchment pool 201 is lower than that of the drainage pipe. The height of the water inlet 202 is 200mm, so that there is space for sedimentation in the catchment tank 201. The sediment and floating objects discharged into the river can be reduced through the catch basin 201. The sediment settles in the catch basin 201. When the catch basin needs to be desilted, the movable cover is opened to remove the sediment in the catch basin 201.

The height of the water inlet of the drainage pipe 202 is higher than the height of the water outlet of the drainage pipe 202. In this embodiment, the slope of the drainage pipe 202 is 1%. When the drainage pipe 202 is long, a support is provided in the middle of the drainage pipe 202. Part 205, the supporting part 205 is a buttress. The drain pipe 202 is a PVC pipe or a fiberglass pipe, and the control valve 204 is made of the same material as the drain pipe.

The outlet well 203 can be prefabricated by concrete or made of fiberglass. The top of the outlet well 203 is open and provided with a pollution barrier 206 to prevent floating objects in the river from affecting the operation of the control valve 204. In order to reduce the erosion of the outer slope 301 by water flow, the height of the outlet well 203 is lower than the design water level of the river channel. In this embodiment, the waste rack 206 of the outlet well 203 is made of stainless steel.

The working process of the anti-backflow river drainage system in this embodiment is as follows:

The drainage ditch 1 collects ground rainwater, and the rainwater is discharged to the catchment tank 201 through the drainage ditch 1. As shown in Figure 5, when the water level A of the catchment pool 201 is higher than the river water level B, the water pressure of the catchment pool 201 is greater than the self-weight of the valve core 2043. and the river water pressure, the water in the drainage pipe 202 lifts the valve core 2043 to the valve library 2045, a water flow channel is formed between the valve seat 2042 and the water outlet pipe 2046, and the control valve 204 is in an open state, thereby draining the water from the catchment pool 201 Discharge into rivers to avoid water accumulation on the ground;

As shown in Figure 6, when the water level A of the catchment pool 206 is lower than the river water level B, the valve core 2043 falls on the valve seat 2042 and clings to the inner wall of the valve seat 2042 under the combined action of its own weight and the external river water pressure. , forming a spherical seal with the valve seat 2043 to cut off the water flow. The control valve 204 is in a closed state, automatically cutting off the backflow water channel to prevent the backflow of river water.

The above descriptions are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of this application shall be included in the protection scope of this application.

Claims (10)

1. The rainwater drainage system is characterized by comprising a drainage ditch and a drainage outlet unit, wherein the drainage ditch is arranged on the bank side of a river channel to collect ground rainwater, the drainage ditch is provided with a plurality of drainage outlet units, each drainage outlet unit comprises a water collecting tank, a drainage pipe, an outlet well and a control valve, the water collecting tank is arranged in the drainage ditch to collect rainwater collected by the drainage ditch, the outlet well is arranged on the slope of the river channel, the water inlet of the drainage pipe is arranged on the inner wall of the water collecting tank, the water outlet of the drainage pipe is arranged in the well of the outlet well, the control valve is arranged at the water outlet of the drainage pipe, and the outlet well is used for fixing the drainage pipe and supporting the control valve;

the control valve comprises a straight bent pipe, a valve seat, a valve core, a valve body, a valve base and a water outlet pipe, wherein the inner diameter of the straight bent pipe is the same as the inner diameter of the water outlet pipe, one end of the straight bent pipe is connected with the outlet of the water outlet pipe, the other end of the straight bent pipe is vertically upwards connected with the lower end of the valve seat, the valve seat is a hollow conical pipeline with the upper part wide and the lower part narrow, the upper end of the valve seat is connected with the valve body, the valve body is a cylindrical barrel, the inner diameter of the valve body is the same as the inner diameter of the upper end of the valve seat, a spherical valve core is arranged in the valve body, the specific gravity of the valve core is greater than the specific gravity of water, the outer diameter of the valve core is greater than the minimum inner diameter of the valve seat, the water outlet pipe is arranged on the pipe wall of the valve body, the water outlet pipe is positioned in a well of the outlet well, the upper part of the valve body is connected with the valve base, the valve base is a pipeline with the upper part narrow and the lower part of the valve base is closed.

2. The anti-reverse-flow rainwater drainage system of claim 1, wherein the surface of the drainage ditch is planted with a grass filter belt, and the two sides of the drainage ditch are planted with shrub filter belts on the sides.

3. The anti-backflow rainwater drainage system according to claim 2, wherein the drainage ditch is of an inverted parabolic shape in cross section, a plain soil layer, a gravel layer and a planting soil layer are sequentially arranged in the drainage ditch from bottom to top, the grassland filtering belt is planted on the planting soil layer, a seepage pipe is arranged in the gravel layer, a plurality of seepage holes are formed in the periphery of the seepage pipe, and the periphery of the seepage pipe is wrapped by geotechnical cloth.

4. The anti-backflow rainwater drainage system according to claim 1, wherein the valve core is a hollow ball and is made of stainless steel or plastic, sand is arranged in the valve core, a plurality of through holes are formed in the upper end face of the valve base, and the weight of the sand can be adjusted.

5. The anti-reverse flow rainwater drainage system of claim 1, wherein a trash rack is arranged at the joint of the catchment pool and the drainage ditch.

6. The anti-backflow rainwater drainage system according to claim 1, wherein the water collecting tank is a square empty box well and is made of concrete or plastic, and a movable cover plate is arranged on the top of the water collecting tank.

7. The anti-backflow rainwater drainage system according to claim 1, wherein the water inlet of the drainage pipe is arranged on the side wall of the water collecting tank, and the bottom of the water collecting tank is 200mm lower than the water inlet of the drainage pipe.

8. A backflow prevention rainwater drainage system as claimed in claim 1 wherein a support is provided at a mid-position of the drainage pipe.

9. A reverse flow prevention rainwater drainage system as claimed in claim 1 wherein the roof of the outlet well is open and is provided with a trash rack.

10. The anti-reverse flow stormwater drainage system as claimed in claim 1, wherein the height of the outlet well is below the design water level of the river.