Floating ball control structure for initial rainwater collecting device in bridge engineering
By using a float control structure in bridge engineering, the problem of rainwater diversion control in bridge engineering was solved, achieving efficient collection of initial rainwater and overflow of rainwater in the middle and later stages, ensuring the stable operation of sewage treatment plants and the safety of municipal pipe networks.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANGHAI URBAN CONSTRUCTION DESIGN & RESEARCH INSTITUTE (GROUP) CO LTD
- Filing Date
- 2025-06-26
- Publication Date
- 2026-04-28
AI Technical Summary
Existing mechanical/hydraulic overflow devices are difficult to effectively control the diversion of rainwater in the early and middle stages of rainfall in bridge engineering. This leads to the abnormal mixing of low-pollution rainwater into municipal pipelines in the middle and later stages, affecting the operational stability of sewage treatment plants and the structural safety of municipal pipeline networks.
The system employs a float control structure, including a water storage device, an elastic device, and a pipe sealing ball. By controlling the opening and closing of the overflow pipe, it ensures that initial rainwater enters the initial rainwater pipe, while mid-to-late-stage rainwater enters the overflow pipe, preventing both from mixing into the municipal pipeline.
It enables the opening and closing of the overflow pipe to be controlled according to rainfall, ensuring efficient collection of initial rainwater and overflow of rainwater in the middle and later stages, protecting the stable operation of the sewage treatment plant and the safety of the municipal pipe network, and reducing the risk of pollutant concentration fluctuations and pipe network corrosion.
Smart Images
Figure CN224173410U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of initial rainwater harvesting technology in bridge engineering, and particularly to a float control structure for initial rainwater harvesting devices in bridge engineering. Background Technology
[0002] In urban stormwater management systems, bridge runoff collection systems, as key nodes of linear infrastructure, directly impact the watershed's water environment quality through their initial stormwater interception efficiency.
[0003] According to the "Technical Specification for Urban Rainwater Harvesting and Utilization Engineering" (GB 50400-2016), this system typically adopts a dual-channel design of "initial diversion + mid-to-late stage overflow": high-pollution runoff within the first 30 minutes of rainfall (or when the cumulative rainfall is ≤10mm) is introduced into the storage tank through the collection pipe. Once the rainwater turbidity sensor detects a value <50 NTU, the system automatically switches to the overflow pipe for direct discharge. However, existing mechanical / hydraulic overflow devices have multiple technical defects in dynamic control, leading to abnormal mixing of low-pollution rainwater into the collection network in the mid-to-late stages, which has a systemic impact on the operational stability of the sewage treatment plant.
[0004] The influx of rainwater in the middle and late stages will trigger a "dilution-impact" biphasic effect on the concentration of pollutants (CODcr) in the influent of the wastewater treatment plant. The initial rainwater CODcr concentration is usually 800-1200 mg / L (including bridge asphalt efflorescence, vehicle exhaust particles, etc.), while the CODcr of the rainwater in the middle and late stages is only 80-150 mg / L. When the volume ratio of the two is >1:3, the biological treatment tank of the wastewater treatment plant faces an imbalance of carbon and nitrogen ratio. The problems include: (1) Insufficient carbon source leads to a decrease in the activity of denitrifying bacteria, and the total nitrogen (TN) removal rate decreases by 12%-18%; (2) Low-concentration influent prolongs the biofilm formation period, and the unit treatment energy consumption increases by 22 kWh / 10,000 tons; (3) Impact water flow destroys the laminar flow state of the sedimentation tank, and the SS settling efficiency decreases by more than 35%.
[0005] Abnormal interception can also trigger hydraulic interactions in the rainwater-sewage pipe network system:
[0006] (1) When the rainwater collection pipe is operated under non-design conditions, the peak flow rate exceeds 1.3 times the value calculated by the Manning formula, which exacerbates the risk of structural leakage in the pipe.
[0007] (2) When the proportion of rainwater in the combined sewer system exceeds 15%, the hydrogen sulfide gas generation rate increases by 4.7 times (EPA832-F-21-003 standard data), accelerating the corrosion of concrete pipes; (3) The sudden increase in the pumping volume causes the frequency converter to trip due to overload.
[0008] Therefore, how to control the opening and closing of the overflow pipe according to rainfall and avoid rainwater entering the municipal pipeline in the middle and later stages and affecting the collection capacity has become a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content
[0009] In view of the above-mentioned deficiencies of the prior art, the present invention provides a float control structure for an initial rainwater collection device in bridge engineering. The purpose is to control the opening and closing of the overflow pipe according to the rainfall, so as to avoid rainwater entering the municipal pipeline in the middle and later stages and affecting the collection capacity.
[0010] To achieve the above objectives, this utility model discloses a float control structure for an initial rainwater collection device in bridge engineering, including a water storage device, an elastic device, and a pipe sealing ball.
[0011] The water storage device is installed inside a vertically installed straight pipe section and is connected to the inner wall of the straight pipe section by a sliding joint. It can move back and forth along the length of the straight pipe section and has an opening at the top to collect some of the rainwater falling from the upper end of the straight pipe section.
[0012] The side wall of the straight pipe section is connected from top to bottom to the overflow pipe and the initial rainwater collection device.
[0013] The overflow pipe and the initial rain pipe are aligned on a vertical straight line at the interface of the straight pipe section, and their projections on the horizontal plane overlap each other.
[0014] The water storage device is closely attached to the inner wall of the straight pipe section connected to the first rain pipe and the overflow pipe, and the side of the device closely attached to the inner wall of the straight pipe section is in the shape of an outwardly convex arc that matches the inner wall of the straight pipe section, and a water outlet is provided near the bottom.
[0015] The elastic device is provided between the water storage device and the straight pipe section;
[0016] Below the water storage device, at the horizontal projection position of the interface between the initial rain pipe and the overflow pipe in the straight pipe section, the pipe sealing ball is provided;
[0017] The size of the pipe plugging ball meets the requirements for sealing the interface between the overflow pipe and the initial rain pipe in the straight pipe section;
[0018] When there is no water in the water storage device, the elastic device holds the water storage device in place and the pipe sealing ball seals the interface of the overflow pipe in the straight pipe section;
[0019] When the weight of the water in the water storage device exceeds the elastic force provided by the elastic device, the water storage device moves downward along the straight pipe section.
[0020] Preferably, the straight pipe section is located at the top edge of the bridge cap beam; the lower end of the initial rain pipe is connected to a longitudinal drainage pipe located inside the bridge cap beam; and the overflow pipe extends from the bottom edge of the bridge cap beam.
[0021] Preferably, the distance between the water outlet and the pipe sealing ball satisfies the following condition: when the pipe sealing ball moves to the interface of the initial rain pipe in the straight pipe section, the water outlet is located at the interface of the overflow pipe in the straight pipe section.
[0022] Preferably, the elasticity of the elastic device satisfies the following: when the water storage device is full of rainwater, it contracts to lower the water storage device to the position where the outlet is located at the interface of the overflow pipe in the straight pipe section, and after the water storage device releases the rainwater from the outlet, it rebounds to move the pipe sealing ball to the interface of the first rain pipe in the straight pipe section.
[0023] Preferably, the inner wall of the straight pipe section, in the portion between the interface of the overflow pipe and the interface of the initial rain pipe, is provided with a groove that matches the shape of the pipe sealing ball.
[0024] The beneficial effects of this utility model are:
[0025] This invention can control the opening and closing of the overflow pipe according to rainfall, preventing rainwater from entering the municipal pipeline in the middle and later stages and affecting the collection capacity.
[0026] The following will further explain the concept, specific structure and technical effects of this utility model in conjunction with the accompanying drawings, so as to fully understand the purpose, features and effects of this utility model. Attached Figure Description
[0027] Figure 1 This diagram illustrates an embodiment of the present invention in the initial rainy season.
[0028] Figure 2 This diagram illustrates an embodiment of the present invention during a period of moderate rain.
[0029] Figure 3 This diagram illustrates an embodiment of the present invention in a state after rainfall has ended. Detailed Implementation
[0030] Example: Figures 1 to 3 As shown, the float control structure for the initial rainwater collection device in bridge engineering includes a water storage device 1, an elastic device 2, and a pipe sealing ball 3.
[0031] The water storage device 1 is installed inside a vertically installed straight pipe section 4 and is connected to the inner wall of the straight pipe section 4 by a sliding joint. It can move back and forth along the length of the straight pipe section 4 and has an opening at the top to receive some of the rainwater falling from the top of the straight pipe section 4.
[0032] The side wall of one side of the straight pipe section 4 is connected from top to bottom to the overflow pipe 5 and the initial rainwater collection pipe 6 of the initial rainwater collection device.
[0033] The interfaces of the overflow pipe 5 and the initial rain pipe 6 at the straight pipe section 4 are aligned on a vertical straight line, and their projections on the horizontal plane overlap.
[0034] The water storage device 1 is closely attached to the inner wall of the straight pipe section 4, the initial rain pipe 6, and the overflow pipe 5. The side of the device closely attached to the inner wall of the straight pipe section 4 is in the shape of an outwardly convex arc that matches the inner wall of the straight pipe section 4. A water outlet is provided near the bottom.
[0035] A spring device 2 is installed between the water storage device 1 and the straight pipe section 4;
[0036] Below the water storage device 1, at the horizontal projection position of the interface between the initial rain pipe 6 and the overflow pipe 5 on the straight pipe section 4, there is a pipe sealing ball 3;
[0037] The size of the pipe plugging ball 3 meets the requirements for plugging the interface between the overflow pipe 5 and the initial rain pipe 6 in the straight pipe section 4;
[0038] When there is no water in the water storage device 1, the elastic device 2 keeps the water storage device 1 in place and the pipe sealing ball 3 seals the interface of the overflow pipe 5 in the straight pipe section 4.
[0039] When the weight of the water in the water storage device 1 exceeds the elastic force provided by the elastic device 2, the water storage device 1 moves downward along the straight pipe section 4.
[0040] This utility model provides a water storage device 1 with a pipe sealing ball 3 that can move up and down between the initial rain pipe 6 and the overflow pipe 5.
[0041] Among them, the initial rainwater pipe 6 is used for initial rainwater interception; the overflow pipe 5 is used for mid-to-late-stage rainwater overflow.
[0042] During the initial rainfall, the water storage device 1 is empty and at its lightest weight. Under the action of the elastic device 2, it is at its highest position. At this time, the pipe sealing ball 3 is located at the interface of the overflow pipe 5 and the straight pipe section 4, sealing the overflow pipe 5. At this time, the rainwater above the bridge surface runoff quickly flows into the municipal drainage network through the initial rain pipe 6, effectively intercepting characteristic pollutants such as polycyclic aromatic hydrocarbons (PAHs) concentration of 3.8-7.2 μg / L precipitated from the asphalt pavement layer and tire wear particles (TRWP) with a particle size ≤10 μm, ensuring that the CODcr concentration of the initial rainwater is controlled within the threshold range of 800-1200 mg / L.
[0043] As rainwater continues to fall in the straight pipe section 4, some of it falls into the water storage device 1. By controlling the size of the opening at the top of the water storage device 1, a principle similar to measuring rainfall is formed. When the rainfall reaches the middle and late stages, the water accumulated in the water storage device 1 compresses the elastic device 2, causing the water storage device 1 to move downward. The pipe sealing ball 3 releases the blocked overflow pipe 5 and gradually blocks the initial rain pipe 6. As the interface of the initial rain pipe 6 in the straight pipe section 4 is gradually blocked by the pipe sealing ball 3, the flow rate into the initial rain pipe 6 continuously decreases. The water level in the straight pipe section 4 begins to rise and begins to drain from the overflow pipe 5. Finally, the water storage device 1 is filled with rainwater, and its outlet near the bottom moves downward to the interface range of the overflow pipe 5 in the straight pipe section 4. The interface of the initial rain pipe 6 in the straight pipe section 4 is completely blocked by the pipe sealing ball 3, and the rainwater in the straight pipe section 4 is completely discharged through the overflow pipe 5.
[0044] After the rainfall ends, the rainwater in the straight pipe section 4 decreases rapidly, the water storage device 1 does not increase in rainwater, and the water is drained through the outlet hole. When the weight of the pipe sealing ball 3 is less than the elastic force of the elastic device 2, the pipe sealing ball 3 is gradually bounced up by the elastic device 2, the overflow pipe 5 is gradually closed, and the initial rain pipe 6 is opened again.
[0045] Water that is not emptied from the water storage device 1 will slowly flow out through the gap between the water storage device 1 and the straight pipe section 4 and be discharged through the first rain pipe 6, or evaporate completely.
[0046] In some embodiments, the straight pipe section 4 is provided at the top edge 71 of the bridge cap beam 7; the lower end of the initial rain pipe 6 is connected to the longitudinal drainage pipe 72 provided in the bridge cap beam 7; and the overflow pipe 5 extends from the bottom edge 73 of the bridge cap beam 7.
[0047] In some embodiments, the distance between the outlet hole and the pipe sealing ball 3 satisfies the following condition: when the pipe sealing ball 3 moves to the interface of the initial rain pipe 6 at the straight pipe section 4, the outlet hole is located at the interface of the overflow pipe 5 at the straight pipe section 4.
[0048] In some embodiments, the elasticity of the elastic device 2 satisfies the following: when the water storage device 1 is full of rainwater, it contracts to lower the water storage device 1 to the position where the outlet hole is located at the interface of the overflow pipe 5 in the straight pipe section 4, and after the water storage device 1 releases rainwater from the outlet hole, it rebounds to move the pipe sealing ball 3 to the interface of the first rain pipe 6 in the straight pipe section 4.
[0049] In some embodiments, the inner wall of the straight pipe section 4, between the interface of the overflow pipe 5 and the interface of the initial rain pipe 6, is provided with a groove 41 that matches the shape of the pipe sealing ball 3.
[0050] The preferred embodiments of this utility model have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of this utility model without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of this utility model through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.
Claims
1. A float control structure for initial rainwater collection devices in bridge engineering, characterized in that, It includes a water storage device (1), an elastic device (2), and a pipe sealing ball (3); The water storage device (1) is installed inside a vertically installed straight pipe section (4) and is connected to the inner wall of the straight pipe section (4) by a sliding joint. It can move back and forth along the length of the straight pipe section (4) and has an opening at the top to receive some rainwater falling from the upper end of the straight pipe section (4). The side wall of the straight pipe section (4) is connected from top to bottom to the overflow pipe (5) and the initial rainwater collection device (6). The overflow pipe (5) and the first rain pipe (6) are aligned on a vertical line at the interface of the straight pipe section (4), and their projections on the horizontal plane overlap each other. The water storage device (1) is closely attached to the inner wall of the straight pipe section (4) connected to the first rain pipe (6) and the overflow pipe (5), and one side of the inner wall of the straight pipe section (4) is in the shape of an outwardly convex arc that matches the inner wall of the straight pipe section (4), and a water outlet is provided near the bottom. The elastic device (2) is provided between the water storage device (1) and the straight pipe section (4). Below the water storage device (1), the pipe sealing ball (3) is located at the horizontal projection position of the interface between the initial rain pipe (6) and the overflow pipe (5) on the straight pipe section (4). The size of the pipe plugging ball (3) meets the requirements for plugging the interface between the overflow pipe (5) and the initial rain pipe (6) in the straight pipe section (4); When there is no water in the water storage device (1), the elastic device (2) keeps the water storage device (1) in place and the pipe sealing ball (3) seals the overflow pipe (5) at the interface of the straight pipe section (4); When the weight of the water in the water storage device (1) exceeds the elastic force provided by the elastic device (2), the water storage device (1) moves downward along the straight pipe section (4).
2. The float control structure for an initial rainwater collection device in bridge engineering according to claim 1, characterized in that, The straight pipe section (4) is set at the top edge (71) of the bridge cap beam (7); the lower end of the initial rain pipe (6) is connected to the longitudinal drainage pipe (72) set in the bridge cap beam (7); the overflow pipe (5) extends from the bottom edge (73) of the bridge cap beam (7).
3. The float control structure for an initial rainwater collection device in bridge engineering according to claim 1, characterized in that, The distance between the outlet hole and the pipe sealing ball (3) satisfies the following condition: when the pipe sealing ball (3) moves to the interface of the first rain pipe (6) in the straight pipe section (4), the outlet hole is located at the position of the overflow pipe (5) at the interface of the straight pipe section (4).
4. The float control structure for an initial rainwater collection device in bridge engineering according to claim 1, characterized in that, The elasticity of the elastic device (2) satisfies the following: when the water storage device (1) is full of rainwater, it contracts to make the water storage device (1) descend to the position where the water outlet is located at the interface of the overflow pipe (5) in the straight pipe section (4), and after the water storage device (1) releases the rainwater from the water outlet, it rebounds to make the pipe sealing ball (3) move to the interface of the first rain pipe (6) in the straight pipe section (4).
5. The float control structure for an initial rainwater collection device in bridge engineering according to claim 1, characterized in that, The inner wall of the straight pipe section (4) is provided with a groove (41) that matches the shape of the pipe sealing ball (3) between the interface of the overflow pipe (5) and the interface of the first rain pipe (6).