A stormwater well arrangement and method to mitigate build-up and facilitate cleaning

Abstract

The application discloses a rainwater well device and method for reducing accumulation and facilitating cleaning, and the device comprises a cleaning system and a device body matched with each other. The device body is arranged in the rainwater well and has the same shape as the rainwater well. The device body comprises a top-through silt collecting cavity, a water inlet and a water outlet communicated with the silt collecting cavity respectively, and a screen is arranged on the water outlet. The water inlet is communicated with a water inflow channel of the rainwater well, the water outlet is communicated with a water outflow channel of the rainwater well, and there is an accumulation space between the water outlet and the bottom of the silt collecting cavity in the vertical direction. When the rainwater reaches a cleaning flow, the silt in the silt collecting cavity is removed. The cleaning system comprises short rods arranged on both sides of the silt collecting cavity, and the short rods are provided with ropes. The ropes are provided with hooks at the ends far away from the short rods, and the hooks are hung outside the rainwater well. The application can reduce the accumulation of silt in the rainwater well, guarantee the drainage efficiency of the rainwater pipe network system, and facilitate manual cleaning without the need of entering the rainwater well.

Description

Technical Field

[0001] This invention relates to the field of municipal drainage technology, and more particularly to a rainwater well device and method for reducing siltation and facilitating cleaning. Background Technology

[0002] In urban drainage systems, stormwater pipe networks are responsible for transporting rainwater and serve as vital drainage channels. As rainwater is transported within these networks, sediment and suspended particulate matter can accumulate. Leaves, branches, and other debris can also enter the network through inlets, causing siltation, especially in storm drains. When siltation reaches a certain level, the drainage efficiency of the stormwater pipe network significantly decreases, exacerbating the risk of urban flooding. Therefore, before each rainy season, manual dredging is organized. Workers must enter storm drains, use shovels to dig silt into buckets, and then use ropes to pull the buckets of silt out of the drains. This process is not only inefficient but also presents poor working conditions and safety risks. Summary of the Invention

[0003] In order to solve the above-mentioned technical problems, the present invention provides a rainwater well device and method that reduces siltation and facilitates cleaning.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0005] A rainwater well device for reducing siltation and facilitating cleaning is assembled on a rainwater well. It includes a cleaning system and a device body that cooperate with each other. The device body has the same shape as the rainwater well and is arranged to fit snugly against it. The device body includes a silt collection chamber extending through the top, and an inlet and an outlet respectively communicating with the silt collection chamber. A screen is installed on the outlet. The inlet communicates with the water flow inflow channel of the rainwater well, and the outlet communicates with the water flow outflow channel of the rainwater well. A siltation gap exists between the outlet and the bottom of the silt collection chamber in the vertical direction. The cleaning system includes short rods on both sides of the silt collection chamber, with ropes attached to the rods. A hook is attached to the end of the rope furthest from the rod, and the hook is hung outside the rainwater well. This reduces the accumulation of silt in the rainwater well and prevents leaves, branches, debris, etc., from entering the rainwater pipes, ensuring the drainage efficiency of the rainwater pipe network system. Furthermore, during cleaning, workers do not need to enter the rainwater well; they can simply remove the device for cleaning and then put it back in, facilitating manual cleaning.

[0006] Preferably, a buckle is provided at the point where the rope contacts the edge of the device body, and the buckle is locked onto the device body to improve the service life of the rope.

[0007] The basic principle formulas for the design of the device of this invention include the following flow rate formulas:

[0008] Cross-sectional flow formula:

[0009] Q = v·A (1)

[0010] Where Q is the water flow rate, in meters (m³). 3 / s, selected as needed, generally the pipe flow rate corresponding to 20% of the frequency; v is the water flow velocity, in m / s; A is the cross-sectional area, in m². 2 .

[0011] The formula for the initial flow velocity of sediment is selected based on the different characteristics of sediment entering the drainage pipe. Taking Deng Peide's derivation as an example:

[0012] v K =3.5d 1 / 4 ·R 0.2 (2)

[0013] Among them, v K The starting flow velocity is in m / s; d is the median particle size of the sediment entering the storm drain in m; R is the hydraulic radius in m.

[0014] Hydraulic radius expression:

[0015] R = A / X (3)

[0016] Where X is the wetted perimeter, in meters (m).

[0017] The method of using the above-mentioned rainwater well device that reduces siltation and facilitates cleaning includes the following steps:

[0018] S1. Set the hook near the opening of the rainwater well, and connect the rope to the hook and the device body. When cleaning, the operator can directly pull the rope to remove the device body from the rainwater well or use a simple lifting device to remove the device body from the rainwater well.

[0019] S2. Hold the short rod and tilt the device to clean the silt in the silt collection chamber. The silt will be discharged through the top port or side inlet of the silt collection chamber.

[0020] S3. After the siltation is cleared, pull the rope to lower the device back into the rainwater well, ensuring that the inlet and outlet are connected to the water flow channels of the rainwater well and the water flow out channels of the rainwater well, respectively. Close the rainwater well cover to complete the cleaning work.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. This invention can effectively reduce the siltation of urban stormwater pipe networks, ensure the drainage efficiency of the pipe network, and reduce the risk of urban flooding.

[0023] 2. This invention solves the problem of the difficulty in manually cleaning rainwater wells, making it easier for operators to clean the wells and reducing operational safety risks. Attached Figure Description

[0024] Figure 1This is a schematic diagram of the overall structure of the rainwater well device of the present invention, which reduces siltation and facilitates cleaning.

[0025] Figure 2 This is a flowchart illustrating the process of reducing and cleaning siltation in the rainwater well device of the present invention.

[0026] Figure 3 This is a schematic diagram showing the design of the outlet height of the rainwater well device of the present invention, which reduces siltation and facilitates cleaning.

[0027] Figure 4 This is a schematic diagram of the water flow direction of the rainwater well device of the present invention, which reduces siltation and facilitates cleaning.

[0028] Attached diagram labels: 1. Hook, 2. Rope, 3. Short rod, 4. Buckle, 5. Device body, 6. Inlet, 7. Outlet, 8. Screen. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of the present invention are only used to explain the present invention and are not intended to limit the present invention.

[0030] A rainwater well device that reduces siltation and facilitates cleaning is installed on the rainwater well. It can reduce the accumulation of silt in the rainwater well and prevent leaves, branches, debris and other objects from entering the rainwater pipes, thus ensuring the drainage efficiency of the rainwater pipe network system. During cleaning, the workers do not need to enter the rainwater well. They can simply take out the device for cleaning and put it back in, which is convenient for manual cleaning.

[0031] Specifically, such as Figure 1-4 As shown, this rainwater well device for reducing siltation and facilitating cleaning includes a cleaning system and a device body 5 that cooperate with each other. The device body 5 has the same shape as the rainwater well and is arranged to fit the rainwater well. The device body 5 includes a silt collection chamber that extends through the top, and an inlet 6 and an outlet 7 that are respectively connected to the silt collection chamber. A screen 8 is provided on the outlet 7. The inlet 6 is connected to the water flow inlet channel of the rainwater well, and the outlet 7 is connected to the water flow outlet channel of the rainwater well. There is a siltation gap between the outlet 7 and the bottom of the silt collection chamber in the vertical direction. When the rainwater reaches the silt removal flow rate, it carries away the silt in the silt collection chamber. The cleaning system includes short rods 3 on both sides of the silt collection chamber. The short rods 3 have ropes 2. The end of the rope 2 away from the short rods 3 has a hook 1. The hook 1 is hung on the outside of the rainwater well.

[0032] The basic principle formulas for the design of the device of this invention include the following flow rate formulas:

[0033] Cross-sectional flow formula:

[0034] Q = v·A (1)

[0035] Where Q is the water flow rate, in meters (m³). 3 / s, selected as needed, generally the pipe flow rate corresponding to 20% of the frequency; v is the water flow velocity, in m / s; A is the cross-sectional area, in m². 2 .

[0036] The formula for the initial flow velocity of sediment is selected based on the different characteristics of sediment entering the drainage pipe. Taking Deng Peide's derivation as an example:

[0037] v K =3.5d 1 / 4 ·R 0.2 (2)

[0038] Among them, v K The starting flow velocity is in m / s; d is the median particle size of the sediment entering the storm drain in m; R is the hydraulic radius in m.

[0039] Hydraulic radius expression:

[0040] R = A / X (3)

[0041] Where X is the wetted perimeter, in meters (m).

[0042] The specific operational steps of this invention will be described separately for reducing siltation and cleaning siltation.

[0043] The steps to reduce siltation are as follows:

[0044] 1. To reduce siltation, the minimum flow velocity of rainwater is used as the starting velocity for sediment initiation, i.e., the flow velocity of rainwater when it flows through the middle of the rainwater well is used as the starting velocity for sediment initiation. At this time, the cross-sectional area A is the product of the width (diameter) D of the rainwater well opening and the water depth h. Substituting into formula (1), we can obtain:

[0045] Q = v·Dh (4);

[0046] 2. The wetted perimeter of rainwater flowing through the middle of the rainwater well is the sum of the width (diameter) D of the rainwater well and twice the water depth h. The cross-sectional area is converted into the product of D and h. Substituting this into formula (3) yields:

[0047] R = Dh / (D+2h) (5);

[0048] 3. Substituting formula (5) into formula (2), we get:

[0049] v K =3.5d 1 / 4 ·[Dh / (D+2h)] 0.2 (6);

[0050] 4. The minimum flow velocity v of rainwater flowing through the middle of the rainwater well is taken as the initial flow velocity v of sediment. K ,Right now:

[0051] Q = 3.5d 1 / 4 ·[Dh / (D+2h)] 0.2 ·Dh (7);

[0052] 5. The flow rate formed by the annual rainfall in the city (generally taking 20% ​​of the rainfall frequency) is used as the pipeline dredging flow rate Q. Given the size D of the storm drain well, the median particle size d of the sediment is... 50 The water depth h can be obtained from the particle size d, which is the starting flow velocity;

[0053] 6. According to formula 5.2.2 in the outdoor drainage design standard GB 50014-2021, the flow velocity of drainage pipes under steady flow conditions should be calculated using the following formula:

[0054]

[0055] Among them, v 管道 denoted as rainwater velocity in the pipe (m / s); n is the roughness coefficient, taken from Table 5.2.3 in the standard; and I is the hydraulic gradient.

[0056] Specifically, taking a circular pipe as an example, such as Figure 3 As shown, the wetted perimeter inside the pipe is Cross-sectional area is Combining formulas (1) and (3), the water depth h1 (h1 = r + a) of the rainwater pipe at the water outlet 7 can be calculated. The height h2 is obtained by subtracting the water depth h1 at the rainwater pipe from the water depth h. Here, h2 is the height of the device outlet 7 from the bottom. This can achieve the goal of reducing siltation when the rainwater flow reaches the sludge removal flow rate and flows through the rainwater well, although the flow velocity decreases.

[0057] 7. A screen 8 is designed at the water outlet 7. When branches, debris, etc. enter the pipe network through the rainwater inlet, they will stay in the sludge collection chamber of the device body 5 due to the blocking effect of the screen 8 at the rainwater well, which can avoid pipe blockage.

[0058] II. The silt removal steps for the above-mentioned rainwater well device that reduces siltation and facilitates cleaning are as follows:

[0059] S1. Set the hook 1 near the opening of the rainwater well, and connect the rope 2 to the hook 1 and the device body 5. When cleaning, the operator can directly pull the rope 2 to remove the device body 5 from the rainwater well or use a simple lifting device to remove the device body 5 from the rainwater well.

[0060] S2. Hold the short rod 3 and use force to tilt the device body 5 to clean the silt in the silt collection chamber. The silt is then discharged through the top port or side inlet 6 of the silt collection chamber.

[0061] S3. After the silt is cleared, pull the rope 5 to lower the device body 5 back into the rainwater well, ensuring that the inlet 6 and outlet 7 are respectively connected to the water inflow channel and water outflow channel of the rainwater well. Close the rainwater well cover to complete the cleaning work. Preferably, the part where the rope 2 contacts the edge of the device body 5 is provided with a buckle 4. The buckle 4 is locked onto the device body 5. During the process of moving the device body 5 by the rope 2, the buckle 4 limits the part that the device body 5 can contact with the rope 2, thereby reducing the friction intensity between the rope 2 and the device body 5 and improving the service life of the rope 2.

[0062] III. The following are the dimensional design steps for the above-mentioned rainwater well device that reduces siltation and facilitates cleaning:

[0063] A. Based on the actual situation of the city, the dredging flow rate and the size of the rainwater well can be known. Taking the dredging flow rate of 0.038 m3 / s and the rainwater well as a circular well with a diameter of 600 mm as an example, the relationship between the minimum flow velocity v and the water depth h can be obtained by substituting into formula (4): 0.038 = 0.6vh;

[0064] B. The median particle size of the sediment in the rainwater is taken as 300 μm. Substituting this into Deng Peide's sediment initiation velocity formula (2), we get: v K =0.46R 0.2 ;

[0065] C. Substituting the diameter of the rainwater well (600mm) into the hydraulic radius derivation formula (5), we get: R = 0.6h / (0.6 + 2h);

[0066] D. Obtain the initial flow velocity of sediment v based on steps B and C. K Relationship with water depth h: v K =0.46×[0.6h / (0.6+2h)] 0.2 ;

[0067] E. When the flow rate in the pipeline is for dredging, the minimum flow velocity v reaches the sediment initiation velocity v. K That is, v = v K Combining steps A and D, the water depth h = 0.21m can be calculated.

[0068] F. The diameter of the rainwater pipe is 200mm, the hydraulic gradient I is 0.01, and the roughness coefficient n is 0.01. According to formula (1) and formula (8), the water depth h1 at the outlet 7 is 150mm. By subtracting h1 from the water depth h, the siltation distance depth between the outlet 7 and the bottom of the siltation chamber inside the device body 5 is 60mm. By setting up the above-mentioned rainwater well device to reduce siltation and facilitate cleaning, the rainwater can carry away the mud and sand in the rainwater well when the siltation flow reaches the sludge removal flow rate, thereby reducing siltation.

[0069] In summary, the rainwater well device and method for reducing siltation and facilitating cleaning disclosed in this invention can effectively reduce siltation in urban rainwater pipe networks, ensure drainage efficiency, reduce the risk of urban flooding, and solve the problem of difficulty in manually cleaning rainwater wells, making it convenient for operators to clean silt and reducing operational safety risks.

[0070] Of course, the present invention may have many other embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and modifications according to the present invention, but these corresponding changes and modifications should all fall within the protection scope of the appended claims.

Claims

1. A rainwater well device that reduces siltation and facilitates cleaning, characterized in that, The device (5) is mounted on a rainwater well and includes a cleaning system and a device body (5) that work together. The device body (5) is shaped like the rainwater well and is arranged to fit the rainwater well. The device body (5) includes a silt collection chamber that is open at the top, and an inlet (6) and an outlet (7) that are open to the silt collection chamber. A screen (8) is provided on the outlet (7). The inlet (6) is open to the water flow inlet channel of the rainwater well, and the outlet (7) is open to the water flow outlet channel of the rainwater well. There is a siltation gap between the outlet (7) and the bottom of the silt collection chamber in the vertical direction. When the rainwater reaches the silt removal flow rate, it will carry away the silt in the silt collection chamber. The cleaning system includes short rods (3) on both sides of the silt collection chamber. The short rods (3) have ropes (2). The end of the rope (2) away from the short rods (3) has a hook (1). The hook (1) is hung on the outside of the rainwater well. The dimensional design steps for the above-mentioned rainwater well device that reduces siltation and facilitates cleaning are as follows: A. Obtain the dredging flow rate and storm drain size based on the actual conditions of the city, and substitute them into the following formula to obtain the minimum stormwater flow velocity. With water depth relation: ； In the formula, For water flow rate, Width of the rainwater well opening; B. Substitute the median particle size of the sediment in the rainwater into Deng Peide's sediment initiation velocity formula. In the formula, The median particle size of sediment entering the storm drain, in meters (m). The hydraulic radius is in meters (m). C. Determine the width of the rainwater well opening. Substituting into the hydraulic radius derivation formula ; D. Obtain the sediment initiation velocity based on steps B and C. and water depth Relationship; E. Minimum flow velocity when the flow rate in the pipeline is for dredging. Reaching the starting velocity of sediment flow ,Right now Combine steps A and D to obtain the water depth. ; F. Obtain the diameter and hydraulic gradient of the rainwater pipe. and roughness coefficient And according to the cross-sectional flow formula The formula for calculating the flow velocity of drainage pipes and channels under steady flow conditions is consistent with the outdoor drainage design standard GB 50014-2021. To obtain the water depth at the outlet (7) water depth minus Obtain the depth of the sedimentation distance between the outlet (7) and the bottom of the sedimentation chamber inside the device body (5); where, The cross-sectional area is denoted as .

2. The rainwater well device for reducing siltation and facilitating cleaning according to claim 1, characterized in that, The part where the rope (2) contacts the edge of the device body (5) is provided with a buckle (4), and the buckle (4) is engaged on the device body (5).

3. A method of using a rainwater well device for reducing siltation and facilitating cleaning as described in any one of claims 1-2, characterized in that, Includes the following steps: S1. Set the hook (1) near the opening of the rainwater well, and connect the rope (2) to the hook (1) and the device body (5). When cleaning, the operator can directly pull the rope (2) to take the device body (5) out of the rainwater well or use a simple lifting device to take the device body (5) out of the rainwater well. S2. Hold the short rod (3) and use force to tilt the device body (5) to clean the silt in the silt collection chamber. The silt is then cleared out through the top port or side inlet (6) of the silt collection chamber. S3. After the silt is cleared, pull the rope (2) to put the device (5) back into the rainwater well and ensure that the inlet (6) and outlet (7) are connected to the water flow inlet channel and the water flow outlet channel of the rainwater well, respectively. Close the rainwater well cover and the cleaning work is completed.

Images