Overflow-height-adjustable weir body structure and intercepting well

Abstract

The utility model relates to the technical field of intercepting wells, in particular to a weir body structure with an adjustable overflow height and an intercepting well. The weir body structure comprises a vertical plate-shaped weir body, and a rectangular overflow opening extending in the height direction is formed in the weir body. The bottom edge of the weir gate is hinged with the bottom edge of the overflow port through a hinge and can bidirectionally overturn around a hinge shaft to adjust the effective overflow height of the overflow port; two groups of fan-shaped grilles are arranged on the two sides of the overflow port and are matched with the weir gate in the overturning process to continuously intercept floating objects; the driving mechanism comprises a stroke-controllable telescopic rod, one end of the telescopic rod is hinged to the weir body, the other end of the telescopic rod is hinged to the weir gate, and the telescopic rod is used for driving the weir gate to overturn in two directions, achieving flexible adjustment of the overflow height and integrating the shunting and slag blocking functions. The weir body structure effectively solves the technical problem that a traditional fixed-height weir body cannot dynamically adjust the overflow height and is difficult to adapt to different flow and pollution load working conditions.

Description

Technical Field

[0001] This utility model relates to the field of interception well technology, specifically a weir structure with adjustable overflow height and an interception well. Background Technology

[0002] In urban combined sewer systems, intercepting wells serve as core environmental infrastructure. Their primary function is to achieve efficient separation of rainwater and sewage. During the dry season, sewage and highly polluted rainwater from the initial stages of rainfall are intercepted and treated at sewage treatment plants. Simultaneously, cleaner rainwater from the later stages of rainfall is discharged into natural water bodies through overflow channels, thereby reducing water pollution and lowering the operational load on sewage treatment plants. The weir, as a key structure for achieving rainwater and sewage separation in intercepting wells, directly determines the separation accuracy, adaptability to operating conditions, and operational stability of the intercepting well.

[0003] Currently, intercepting wells generally employ a fixed-height, integral structure for their weirs. Once the weir is poured or constructed, its overflow height remains constant and cannot be dynamically adjusted according to actual operating conditions. For example, utility model patent CN212641696U discloses a non-powered intercepting well in which the weir is a typical fixed-height, integral structure. The lowest point of the upper edge of the weir is higher than the upper edge of the intercepting pipe opening. This fixed-height weir, in conjunction with a flow-limiting unit, achieves separation of rainwater and sewage. Its working logic is as follows: During the dry season and the first rain, the flow restriction unit is in the open state. Sewage and the first rain are treated by the sand lifting unit and then flow into the interceptor pipe through the flow restriction unit, and are then intercepted to the sewage treatment plant. During the middle and later stages of rainfall, as the inflow increases, the liquid level in the interceptor well rises. The flow restriction unit uses a float to drive the baffle to descend and gradually cover the opening of the interceptor pipe to achieve flow restriction. The relatively clean rainwater in the middle and later stages overflows through the fixed-height weir to the outlet pipe for discharge. At the same time, this patent sets a non-powered scum baffle as a scum interception unit on the weir, sets a hydraulically driven sand lifting unit at the outlet of the inlet pipe, and sets an anti-backflow unit in the outlet pipe to achieve the functions of scum interception, sand and gravel deposition, and prevention of river water backflow. The whole system adopts a non-powered design and does not require the consumption of external energy.

[0004] During actual rainfall, the pollution load of rainwater exhibits significant phased differences. Initially, rainwater carries surface pollutants with high concentrations, requiring maximum interception and treatment. However, in the later stages, the pollution concentration decreases considerably after flushing, allowing for a moderate increase in the overflow ratio to alleviate the load on wastewater treatment plants. However, the fixed overflow threshold of the weirs in the aforementioned interception wells is fixed. The flow rate of the intercepting pipe can only be adjusted through the flow-limiting unit, not by adjusting the weir height to actively adapt to the dynamic changes in rainwater pollution load. This can lead to a situation where initial rainwater may be discharged directly in large quantities due to an excessively low overflow threshold, causing water pollution, or clean rainwater in the later stages may be excessively intercepted due to an excessively high overflow threshold, increasing unnecessary treatment costs.

[0005] Therefore, there is an urgent need for a weir structure with adjustable overflow height to control the overflow threshold and improve the environmental adaptability of the interception well. Utility Model Content

[0006] To address the technical problem of difficulty in controlling overflow levels due to the inability to adjust the overflow height of a weir, this invention provides a weir structure with an adjustable overflow height. Based on this weir structure, this invention also provides a cutoff well utilizing this weir structure.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A weir structure with adjustable overflow height, comprising:

[0009] The weir body has a rectangular overflow outlet extending along its height.

[0010] The bottom edge of the weir gate is hinged to the bottom edge of the overflow outlet via a hinge. The weir gate can rotate bidirectionally around the hinge to adjust the effective overflow height of the overflow outlet.

[0011] Two sets of fan-shaped grids are respectively set on both sides of the overflow outlet, and cooperate with the weir gate during the overturning process to continuously intercept floating objects;

[0012] The drive mechanism, used to drive the weir gate to tilt, includes a telescopic rod with controllable stroke, one end of which is hinged to the weir body and the other end of which is hinged to the weir gate.

[0013] As a further improvement to the above scheme: the fan-shaped grid includes multiple barrier bars arranged in parallel from top to bottom along the height of the weir. The length of each barrier bar on the same side increases sequentially from top to bottom. The trajectory formed by connecting the farthest ends of each barrier bar constitutes an arc with the hinge point at the bottom of the weir gate as the center and the height of the weir gate as the radius.

[0014] As a further improvement to the above scheme: the telescopic rod is a hydraulic cylinder, the tail of the hydraulic cylinder is hinged to the support frame, and the support frame is fixed to the weir body; the top of the piston rod of the hydraulic cylinder is hinged to the top of the weir gate.

[0015] As a further improvement to the above scheme: a hinged lug is welded to the outer side of the top of the weir gate, and the top of the piston rod is hinged to the hinged lug through a fisheye joint.

[0016] As a further improvement to the above scheme, a flow gap is reserved between the corresponding sides of the fan-shaped grid and the weir gate.

[0017] As a further improvement to the above scheme, a gate frame that is adapted to the size of the weir gate and used for sealing is embedded in the overflow outlet.

[0018] A diversion well includes:

[0019] The main body is divided into a flow restriction zone and a backflow prevention zone by a weir structure with adjustable overflow height.

[0020] The inlet pipe, the intercepting sewage pipe, and the outlet pipe are installed at the lower part of the well wall in the flow restriction zone, and the water level of the intercepting sewage pipe is lower than that of the inlet pipe. The outlet pipe is installed in the middle of the well wall in the backflow prevention zone.

[0021] Sand-lifting unit, flow-limiting unit, slag-blocking unit, and backflow prevention unit;

[0022] The intelligent control unit includes a sensor assembly, a main control unit, and a drive unit. The sensor assembly is electrically connected to the main control unit; the main control unit is electrically connected to the drive unit and is used to control the drive mechanism to drive the weir gate to flip.

[0023] As a further improvement to the above solution: the sensor assembly includes a water quality monitoring sensor and a liquid level sensor. The water quality monitoring sensor is an online COD sensor and a suspended solids sensor, and the liquid level sensor is an immersion liquid level transmitter.

[0024] As a further improvement to the above solution: the anti-backflow unit is a one-way flap gate structure, installed in the middle of the outlet pipe.

[0025] As a further improvement to the above scheme: the drive unit includes an electromagnetic directional valve, a hydraulic pump station, an overflow valve, and a throttle valve, the throttle valve being used to adjust the overturning speed of the weir gate.

[0026] Compared with the prior art, the beneficial effects of this utility model are:

[0027] 1. The rectangular overflow outlet on the weir extends along the height direction, and in conjunction with the bidirectional flipping structure hinged at the bottom edge of the weir gate, the effective overflow height of the overflow outlet can be flexibly adjusted to meet the diversion needs under various working conditions such as dry season, different stages of rainfall, and extreme rainstorms, solving the problem that fixed weirs cannot dynamically adapt to changes in flow and pollution load. In addition, two sets of fan-shaped grids are respectively set on both sides of the overflow outlet, and continuously cooperate with the weir gate during the flipping process to intercept floating objects, eliminating the need for an additional independent slag-blocking structure, realizing the integration of diversion and slag-blocking functions, and simplifying the overall structure. Secondly, a telescopic rod with controllable stroke is used as the driving mechanism. Through the connection method of hinged ends, it can smoothly drive the weir gate to flip precisely, and flexibly control the flipping angle, ensuring the accuracy and stability of overflow height adjustment.

[0028] 2. The multiple barrier bars of the fan-shaped grid are arranged parallel from top to bottom along the height of the weir, ensuring uniform interception and coverage of floating debris in the water flow and avoiding blind spots. The length of the barrier bars on the same side increases sequentially from top to bottom, and the trajectory of the farthest endpoint forms an arc with the hinge point of the weir gate as the center and the height of the weir gate as the radius. This design ensures that the weir gate can maintain effective cooperation with the barrier bars at any rotation angle, preventing excessive gaps in the debris-blocking gaps caused by rotation that would affect the interception effect, and avoiding structural interference, thus ensuring the continuity of the debris-blocking function. At the same time, this structural design does not require additional dynamic adjustment components; it can adapt to the full stroke rotation of the weir gate simply by the fixed arrangement of barrier bars. The structure is simple, the failure rate is low, and the stability and adaptability of debris blocking are improved without increasing the operational burden.

[0029] 3. The gate frame and the weir gate feature a precisely matched cover, significantly improving the sealing performance when the weir gate is closed. This effectively prevents sewage or rainwater from leaking through the gap between the weir gate and the overflow outlet during interception operations, ensuring the interception effect. The embedded gate frame reinforces the edge of the overflow outlet, reducing damage from long-term water flow erosion and collisions during weir gate opening and closing, enhancing the structural stability of the overflow outlet, and extending its service life. The gate frame provides a clear positioning reference for weir gate closure, ensuring a precise fit each time the weir gate flips upward to close, avoiding misalignment that could affect sealing and interception reliability, and making the operation of the weir structure more stable and controllable. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the internal structure of the intercepting well in this utility model.

[0031] Figure 2 This is a top view of the intercepting well structure in this utility model.

[0032] In the diagram: 10. Main body; 20. Adjustable weir; 21. Weir; 22. Overflow outlet; 23. Weir gate; 24. Fan-shaped bar; 241. Barrier strip; 25. Support frame; 26. Telescopic rod; 40. Inlet pipe; 50. Sewage interceptor pipe; 60. Outlet pipe; 70. Sand lifting unit; 80. Flow limiting unit; 90. Bracket; 91. Water quality monitoring sensor; 92. Liquid level sensor. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0034] I. Interception Well

[0035] like Figure 1 and Figure 2 As shown, this embodiment discloses an intercepting well with adjustable overflow height. Its core is based on the existing intercepting well foundation structure (refer to patent CN212641696U), integrating an adjustable overflow weir structure and an intelligent monitoring and linkage system to achieve precise and intelligent control of rainwater and sewage separation. The intercepting well as a whole comprises four major modules: a well body assembly, a diversion core unit, auxiliary functional units, and an intelligent control unit. These modules work together to complete the entire process of intercepting sewage, diverting wastewater, preventing backflow, trapping sludge, and settling sand. The specific structure is as follows.

[0036] (a) Well body assembly

[0037] 1. Ontology

[0038] The main body 10 is integrally cast from C30 reinforced concrete. The well body has a rectangular structure with a permeability grade of P8, ensuring structural stability under long-term immersion. The interior of the well body is divided into a flow-limiting zone on the left and an anti-backflow zone on the right by an adjustable weir 20. The volume ratio of the two zones is adapted to the flow distribution requirements during the separation of rainwater and sewage.

[0039] 2. Equipment entrances / exits and installation / maintenance access points

[0040] The top of the main body 10 is equipped with a circular equipment entrance / exit, fitted with a non-slip cover made of 304 stainless steel. The cover is hinged to the top of the main body 10 and features an anti-theft lock. A circular maintenance platform is located below the cover, paved with patterned steel plates and edged with guardrails. Rectangular maintenance openings are also provided on the maintenance platform at the locations corresponding to the flow restriction zone and backflow prevention zone, facilitating routine maintenance of the internal equipment.

[0041] 3. Ladder structure

[0042] Stainless steel 304 ladders are vertically installed in both the flow restriction zone and the backflow prevention zone. The ladders are fixed to the pre-embedded parts reserved in the well wall. The edges of the ladder steps are smooth and burr-free. The top is flush with the maintenance platform and the bottom is close to the bottom of the well body, which facilitates the workers to go up and down.

[0043] (II) Diversion Core Unit

[0044] 1. Adjustable weir structure

[0045] The adjustable weir 20 includes a weir body 21, an overflow outlet 22, a weir gate 23, a fan-shaped grid 24, and a drive mechanism.

[0046] Weir 21: Made of 304 stainless steel, integrally welded, it is a vertical plate structure, fixed to the concrete base in the middle of the well body by expansion bolts. The base is made of C30 concrete and integrally formed with the bottom plate of the well body to ensure the stable installation of weir 21. Alternatively, a reinforced concrete structure can be used, integrally formed with the main body 10.

[0047] Overflow port 22: A rectangular overflow port 22 extending from top to bottom is provided in the middle of the weir body 21. The inner edge of the overflow port 22 is rounded to avoid stress concentration caused by water flow scouring.

[0048] Weir gate 23: Made of 316 stainless steel, its dimensions are adapted to the door frame embedded in the overflow port 22 to form a sealing fit. The bottom edge of the weir gate 23 is hinged to the bottom edge of the overflow port 22 via a stainless steel hinge, ensuring that the weir gate 23 can be rotated bidirectionally within a range of 0-90° around the hinge axis (the overflow port 22 is fully open when rotated downwards to a maximum of 90°, and completely closed when rotated upwards to fit against the body 10 of the weir 21). The surface of the weir gate 23 is coated with an anti-corrosion coating to enhance its corrosion resistance.

[0049] Fan-shaped grille 24: Stainless steel 304 barrier bars 241 are vertically welded to both sides of the overflow outlet 22. Multiple bars are installed on each side, and the barrier bars 241 on the same side are arranged at equal intervals from top to bottom along the height direction of the weir body 21. The length of each barrier bar 241 on the same side increases sequentially from top to bottom, and the trajectory of the farthest end of each barrier bar 241 is an arc with the hinge axis of the weir gate 23 as the center and the height of the weir gate 23 as the radius. The surface of the barrier bars 241 is smooth and burr-free. They are welded and fixed to the inner wall of the weir body 21, and the weld is treated with anti-rust paint to ensure that the weir gate 23 remains in close contact with the barrier bars 241 or with a slight gap at any rotation angle, thus always intercepting scum and debris in the rainwater.

[0050] A flow gap is reserved between the corresponding sides of the fan-shaped bar screen 24 and the weir gate 23. The setting of this filter gap ensures that the water flow can pass smoothly during the overflow process, and does not affect the continuous interception function of the fan-shaped bar screen 24 against the floating scum in the rainwater through the barrier strip 241. This ensures that the diversion and scum interception functions can be achieved in tandem at any flipping angle of the weir gate 23.

[0051] Drive mechanism: Two double-acting hydraulic cylinders are used as telescopic rods 26 with controllable stroke to meet the power requirements for the rotation of the weir gate 23. The hydraulic cylinders are hinged to the side of the weir body 21 opposite to the overflow direction via a steel support frame 25. The support frame 25 is made of Q235B steel and welded and fixed to the weir body 21. The top of the piston rod of the hydraulic cylinder is connected to the hinge ear plate on the outer side of the top of the weir gate 23 via a fisheye joint. The hinge ear plate is welded and fixed to the weir gate 23 to ensure that the hydraulic cylinder can smoothly drive the weir gate 23 to rotate around the hinge axis when it extends and retracts.

[0052] 2. Water inlet pipe

[0053] The inlet pipe 40 is installed on the lower part of the left side of the well wall in the flow restriction zone. It is made of ductile iron and is sealed to the well wall with a flexible waterproof sleeve to ensure no leakage at the connection. The pipe opening is equipped with a flared flow guide structure to reduce water flow impact.

[0054] 3. Sewer interceptor

[0055] The interceptor pipe 50 is installed on the lower part of the left side of the well wall in the flow restriction zone, below the installation height of the inlet pipe 40. It is made of ductile iron and is sealed to the well wall with a flexible waterproof sleeve. A stainless steel grating is installed at the inlet of the interceptor pipe 50 to intercept large particles of debris. The grating is connected to the pipe flange for easy disassembly and cleaning.

[0056] 4. Water outlet pipe

[0057] The outlet pipe 60 is installed in the middle of the right well wall of the backflow prevention zone. It is made of ductile iron and the pipe is sealed to the well wall with a flexible waterproof sleeve to ensure rapid discharge of rainwater.

[0058] (III) Auxiliary Functional Units

[0059] 1. Sand-lifting unit

[0060] The sand-lifting unit 70 is located at the bottom of the well body near the outlet of the inlet pipe 40 in the flow-limiting zone. It employs a hydraulically driven spiral sand lifter. The main body of the sand lifter is made of 304 stainless steel and includes spiral blades, a sedimentation basket, and a guide pipe. The sand lifter is installed at an angle, with the inlet facing the outlet of the inlet pipe 40. The kinetic energy of the water flow in the inlet pipe 40 drives the spiral blades to rotate, transporting the deposited sand and gravel to the sedimentation basket at the top. The sedimentation basket has a cylindrical structure, and the basket body is made of stainless steel wire mesh. A removable cover plate is provided on the top for easy periodic cleaning of the sand and gravel.

[0061] 2. Current limiting unit

[0062] The flow limiting unit 80 is installed inside the inlet of the interceptor pipe 50 and is arranged coaxially with the interceptor pipe 50. The flow limiting unit 80 includes a housing, a float, a transmission mechanism, and a baffle. The housing is welded from Q235B steel, and the outer side of the housing is fixed to the well wall by a bracket 90. Vertical slide rails (made of 304 stainless steel) are provided on both sides inside the housing. The baffle is also made of 304 stainless steel and its size is adapted to the pipe opening of the interceptor pipe 50. The baffle is embedded in the slide rails on both sides and can slide up and down along the slide rails. The float is made of high-density polyethylene and is connected to the transmission mechanism through a connecting rod. The transmission mechanism is a gear and rack structure. The rack is fixedly connected to the baffle, and the gear meshes with the float connecting rod. In the initial state, the lower edge of the baffle is higher than the upper edge of the opening of the intercepting pipe 50, and the intercepting pipe 50 is fully open. When the liquid level in the flow restriction zone rises, the float rises with the liquid level and drives the baffle to descend along the slide rail through the gear and rack transmission, gradually covering the opening of the intercepting pipe 50 to achieve flow restriction. When the liquid level drops, the float descends, the baffle resets, and the opening degree of the intercepting pipe 50 increases.

[0063] 3. Slag trapping unit

[0064] A non-powered scum baffle is installed on the top of the weir 21. The scum baffle is made of 304 stainless steel. The bottom of the scum baffle is hinged to the top of the weir 21. A foam pontoon is installed on the top. The buoyancy of the pontoon keeps 1 / 3 of the pontoon above the water surface, intercepting floating garbage and scum and preventing them from entering the outlet pipe 60.

[0065] 4. Anti-backflow unit

[0066] Installed in the middle of the outlet pipe 60, it adopts a one-way flap gate anti-backflow structure. The flap gate is made of nitrile rubber composite steel plate and is connected to the flange of the outlet pipe 60. When the water level in the intercepting well is higher than the water level in the external river, the water flow pushes the flap gate to open, and the rainwater is discharged normally; when the water level in the river is higher than the water level in the well, the flap gate closes under the action of water pressure, preventing river water from flowing back into the intercepting well.

[0067] (iv) Intelligent control unit

[0068] 1. Sensor assembly

[0069] Water quality monitoring sensor 91: Employing online COD and suspended solids sensors, it is installed in the middle of the flow-limiting zone and fixed to the well wall via a stainless steel bracket 90. The probe of water quality monitoring sensor 91 extends deep into the water, enabling real-time monitoring of pollutant concentration parameters such as COD concentration and suspended solids content in rainwater and sewage. It features a short data sampling cycle and transmits monitoring data to the main control unit via a 485 bus.

[0070] Liquid level sensor 92: It adopts an immersion liquid level transmitter and is installed in the flow restriction zone and the backflow prevention zone respectively. The sensor is suspended from the bracket 90 at the top of the well wall by a steel wire rope. The probe is close to the bottom and can collect the liquid level height data of the two zones in real time. The sampling cycle is short and the data is transmitted to the main control unit through the 485 bus.

[0071] 2. Main control unit

[0072] The system employs a programmable logic controller (PLC), installed in a control box on the maintenance platform at the top of the well. The control box is made of 304 stainless steel, providing waterproof, dustproof, and corrosion-resistant protection with an IP65 rating. The main control unit receives real-time data from water quality monitoring sensor 91 and liquid level sensor 92 via a 485 bus. It incorporates a rainwater and sewage separation control algorithm, outputting control signals to the solenoid directional valve of the hydraulic cylinder based on preset thresholds to control the cylinder's extension and retraction. Simultaneously, the main control unit has a reserved 5G / LoRa communication interface, allowing the upload of equipment operating status and monitoring data to a cloud management platform for remote monitoring and control.

[0073] 3. Drive unit

[0074] The system includes a dedicated solenoid directional valve for hydraulic cylinders, a hydraulic pump station, and auxiliary components such as relief valves and throttle valves, all housed in a hydraulic cabinet located below the control box. The hydraulic pump station provides power to the hydraulic cylinders, the solenoid directional valves receive control signals from the main control unit to extend, retract, and stop the hydraulic cylinders, and the throttle valves adjust the speed of the hydraulic cylinders to ensure smooth tilting of the weir gate 23.

[0075] It should be noted that the electronic control technologies involved in the intelligent control unit of this utility model are all existing mature and conventional technologies: the 485 bus data transmission method between the sensor components and the main control unit, and the electrical connection relationship between the main control unit and the drive unit, are conventional connection methods commonly used in electronic control systems in this field; the rainwater and sewage diversion control algorithm built into the main control unit is essentially conventional logic programming based on preset water quality and water level thresholds to control the action of the drive mechanism, and its control logic can be implemented using conventional programming methods in this field; the reserved 5G / LoRa communication interface and data upload function between the main control unit and the cloud management platform are also standard configurations of existing remote monitoring systems. The above-mentioned electronic control-related control programs, connection methods, and other technologies have been widely used in similar intelligent control devices and are mature and reliable.

[0076] II. Application of Interception Wells

[0077] As a core water flow control hub between the reservoir, wetland, and Shahe River, the intercepting well achieves organic integration of the three through "front-end collection - intelligent diversion - system linkage": one end receives rainwater and sewage from urban non-point source pollution sources such as farms, while the other end is connected to the pre-treatment ecological sedimentation pond of the Duotang Wetland System through the intercepting sewage pipe 50. Simultaneously, it is directly connected to the Shahe River through an overflow channel, and the purified wetland tailwater flows into the supplementary ecological base flow. During the dry season, the intercepting well intercepts all sewage and diverts it to the wetland for multi-stage purification, preventing pollution of the reservoir and Shahe River. In the early stages of rainfall, highly polluted initial rainwater is introduced into the wetland for pretreatment through the intercepting well, reducing the impact on the reservoir's water quality. In the middle and later stages of rainfall, clean rainwater is quickly discharged into the Shahe River through the overflow channel, reducing the wetland's operational load. During extreme rainstorms, the intercepting well maximizes the opening of the overflow channel to ensure smooth drainage of the Shahe River and prevent flooding from affecting the reservoir's safety.

[0078] like Figure 2 As shown, the intercepting well is equipped with two intercepting pipes 50, and correspondingly configured with two flow limiting units 80 and two sand lifting units 70. The two flow limiting units 80 are installed inside the inlet of the two intercepting pipes 50, and the two sand lifting units 70 are arranged at the bottom of the two sides of the flow limiting zone near the outlet of the inlet pipe 40, to ensure that they are compatible with the intercepting pipes 50 and improve the efficiency of sewage interception and sand treatment. Figure 2 The upper interceptor pipe 50 flows to the corresponding sewage treatment plant, while the lower interceptor pipe 50 flows to the ecological sedimentation pond.

[0079] (a) Dry season operating conditions

[0080] The pipeline network contains only sewage, with no rainwater entering, and the multi-pond system is in a low-load purification state.

[0081] The intelligent control unit detects high pollution concentration and low liquid level data through water quality monitoring sensor 91 and liquid level sensor 92, and controls the weir gate 23 to be completely closed and the overflow channel to be sealed.

[0082] After the sewage passes through the sand-lifting unit in the intercepting well for sedimentation and the bar screen for filtering, it is transported in full through the intercepting pipe 50 to the existing integrated sewage treatment equipment for purification. After that, it is introduced into the pre-treatment ecological sedimentation pond for further purification to avoid direct discharge of sewage.

[0083] The flow restriction unit 80 remains open to ensure smooth sewage transport without stagnation or accumulation.

[0084] (ii) Initial stage of rainfall

[0085] Rainwater carries pollutants from the ground, resulting in high concentrations of pollution in the mixed rainwater and sewage.

[0086] The intelligent control unit detects medium to high pollution concentrations and rising liquid levels through water quality monitoring sensor 91 and liquid level sensor 92. The intelligent control unit controls the weir gate 23 to open at a small angle, and the overflow height is moderately reduced, allowing only a small amount of rainwater to overflow.

[0087] Most of the highly polluted mixed water is introduced into the existing integrated sewage treatment equipment through the interceptor pipe 50 for purification treatment, and then introduced into the pre-treatment ecological sedimentation pond for further purification treatment.

[0088] The flow limiting unit 80 gradually limits the flow as the liquid level rises, preventing the sewage treatment plant and integrated sewage treatment equipment from operating under overload conditions.

[0089] (III) Working conditions during the middle and late stages of rainfall

[0090] Rainwater pollution concentration has decreased significantly, and operating load has decreased.

[0091] Water quality monitoring sensor 91 detected a low pollution concentration, liquid level sensor 92 displayed a high liquid level, and intelligent control unit controlled the weir gate 23 to open at a large angle (or fully open), reducing the overflow height to a low level.

[0092] The float of the flow limiting unit 80 rises to a high position as the liquid level rises, causing the baffle to completely close the intercepting pipe 50 and stop the flow.

[0093] Clean rainwater is quickly discharged through the overflow channel, or a small amount flows into the aeration pond or oxidation pond for simple purification before being discharged, reducing the treatment pressure.

[0094] (iv) Extreme Rainstorm Conditions

[0095] Short-term heavy rainfall caused the well fluid level to rapidly approach the safe threshold, so drainage safety should be prioritized.

[0096] The liquid level sensor 92 triggers a safety warning, and the intelligent control unit prioritizes the full opening of the weir gate 23, reducing the overflow height to the minimum and maximizing drainage capacity.

[0097] The interception function is suspended, and all rainwater is discharged through the overflow channel to avoid flooding in the pipe network. At the same time, the dry streams and surface flow wetlands of the multi-pond system are quickly diverted for drainage.

[0098] The scum interception unit (barrier bar 241 + scum baffle) works together to intercept scum carried by rainwater, preventing blockage of the inlet channels of the multi-pond system.

[0099] (v) Sudden Increase in Wastewater Flow

[0100] During the dry season or during rainfall, there is a sudden increase in industrial wastewater and aquaculture wastewater, resulting in extremely high pollution concentrations.

[0101] Water quality monitoring sensor 91 and liquid level sensor 92 detected extremely high pollution concentration and abnormal rise in liquid level. The intelligent control unit controlled the weir gate 23 to open at a small angle, reducing the overflow area and expanding the sewage interception space.

[0102] The flow restriction unit 80 maintains a large opening degree to ensure that highly polluted sewage is quickly transported to the pre-treatment ecological sedimentation pond, and the multi-pond system is linked to enhance the aeration power of the aeration pond and improve the purification efficiency.

[0103] Only a very small amount of sewage is discharged through overflow outlet 22 to avoid secondary pollution. At the same time, the intelligent control unit issues an early warning to notify staff to investigate the source of pollution.

[0104] (v) Synergistic use with the Duotang Wetland System

[0105] As a front-end diversion node of the system, the diversion strategy of the intercepting well is regulated by the water quality feedback of the multi-pond system: when the aeration pond or oxidation pond detects abnormal water quality, the intelligent control unit will adjust the opening degree of the weir gate 23 to increase the amount of sewage intercepted and reduce the pollution load entering the multi-pond system.

[0106] The intercepted wastewater is directed to an ecological sedimentation pond via an integrated wastewater treatment system to improve subsequent purification efficiency.

[0107] (vi) Intelligent monitoring and remote control

[0108] It should be noted that the water quality thresholds (such as critical values ​​for COD, suspended solids, dissolved oxygen, etc.) and water level thresholds (such as low / medium / high liquid level classification and safety warning liquid level) involved in the operation of the interception well are scientifically set based on linear water quality testing standards, taking into account the actual climate characteristics, hydrological conditions, pollution source distribution (such as aquaculture wastewater and urban non-point source pollution load), and the treatment capacity of the multi-pond wetland system. These thresholds are dynamically calibrated according to actual conditions such as changes in watershed pollution and seasonal rainfall patterns. The opening angle of the weir gate 23 (different gradients from completely closed to 90° fully open) can be calculated. The higher the pollution concentration and the larger the amount of sewage to be intercepted, the smaller the opening angle of the weir gate 23 and the higher the overflow height. The higher the water level and the larger the amount of water to be discharged, the larger the opening angle of the weir gate 23 and the lower the overflow height. This ensures that the diversion strategy under each working condition can accurately adapt to the actual local water environment conditions, taking into account both pollution control and system operation efficiency.

[0109] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A weir structure with adjustable overflow height, characterized in that, include: The weir body (21) has a rectangular overflow outlet (22) extending along the height direction. Weir gate (23), the bottom edge of weir gate (23) is hinged to the bottom edge of overflow port (22) by a hinge, and weir gate (23) rotates bidirectionally around the hinge to adjust the effective overflow height of overflow port (22); Two sets of fan-shaped grids (24) are respectively set on both sides of the overflow port (22) and cooperate with the weir gate (23) during the overturning process to continuously intercept floating objects; The drive mechanism, used to drive the weir gate (23) to flip, includes a telescopic rod (26) with controllable stroke. One end of the telescopic rod (26) is hinged to the weir body (21), and the other end is hinged to the weir gate (23).

2. The weir structure of claim 1, wherein The fan-shaped grid (24) includes multiple barrier bars (241) arranged in parallel from top to bottom along the height direction of the weir body (21). The length of each barrier bar (241) on the same side increases sequentially from top to bottom. The trajectory formed by connecting the farthest endpoints of each barrier bar (241) constitutes an arc with the bottom hinge of the weir gate (23) as the center and the height of the weir gate (23) as the radius.

3. The weir structure with adjustable overflow height according to claim 1, characterized in that, The telescopic rod (26) is a hydraulic cylinder. The tail of the hydraulic cylinder is hinged to the support frame (25), and the support frame (25) is fixed to the weir body (21). The top of the piston rod of the hydraulic cylinder is hinged to the top of the weir gate (23).

4. The weir structure of claim 3, wherein The top of the weir gate (23) is welded with a hinged ear plate, and the top of the piston rod is hinged to the hinged ear plate through a fish-eye joint.

5. The weir structure with adjustable overflow height according to claim 1, characterized in that, A flow gap is reserved between the corresponding sides of the fan-shaped grid (24) and the weir gate (23).

6. The weir structure with adjustable overflow height according to claim 1, characterized in that, The overflow outlet (22) is fitted with a door frame that is compatible with the size of the weir gate (23) and is used for sealing.

7. A diversion well, characterized in that, include: The body (10) is divided into a flow restriction zone and a backflow prevention zone by a weir structure with adjustable overflow height as described in any one of claims 1-6. Water inlet pipe (40), sewage interceptor pipe (50) and water outlet pipe (60). Water inlet pipe (40) and sewage interceptor pipe (50) are both installed at the lower part of the well wall in the flow restriction zone, and the water level of sewage interceptor pipe (50) is lower than that of water inlet pipe (40). Water outlet pipe (60) is installed in the middle of the well wall in the backflow prevention zone. Sand-lifting unit (70), flow-limiting unit (80), slag-blocking unit and backflow prevention unit; The intelligent control unit includes a sensor assembly, a main control unit and a drive unit. The sensor assembly is electrically connected to the main control unit. The main control unit is electrically connected to the drive unit and is used to control the drive mechanism to drive the weir gate (23) to flip.

8. A diversion well according to claim 7, characterized in that, The sensor assembly includes a water quality monitoring sensor (91) and a liquid level sensor (92). The water quality monitoring sensor (91) is an online COD sensor and a suspended solids sensor, and the liquid level sensor (92) is an immersion liquid level transmitter.

9. A diversion well according to claim 8, characterized in that, The backflow prevention unit is a one-way flap gate structure, installed in the middle of the outlet pipe (60).

10. The intercepting well of claim 7, wherein, The drive unit includes an electromagnetic reversing valve, a hydraulic pump station, an overflow valve, and a throttle valve. The throttle valve is used to adjust the overturning speed of the weir gate (23).

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