An initial rainwater interception well and an initial rainwater interception control method

Abstract

The present invention discloses an initial rainwater interception well and an initial rainwater interception control method. The rainwater interception well comprises: a well body formed with a well cavity, the well cavity comprising a water distribution well and a power well separated from each other; a sewage interception hole and a water inlet hole connected to the power well are provided on the wall of the water distribution well; an opening control structure for adjusting the opening and closing degree of the sewage interception hole is installed at the sewage interception hole; the well cavity is connected to a clean rainwater outlet pipe; the water inlet level of rainwater from the water distribution well entering the clean rainwater outlet pipe is higher than the water inlet hole and the sewage interception hole; a liquid level sensing structure is provided in the power well and is transmission-connected to the opening control structure; the liquid level sensing structure can rise and fall with changes in the liquid level of the power well; the rise of the liquid level sensing structure can link the opening control structure to reduce the opening degree of the sewage interception hole. The present invention does not require the installation of an electrically controlled valve or gate, does not require external power, has a wide range of applications, is low-carbon and energy-saving, has low construction costs, and is easy to maintain.

Description

Technical Field

[0001] The present invention relates to the technical field of rainwater collection and separation, and in particular to an initial rainwater interception well and an initial rainwater interception control method. Background Art

[0002] Rainwater containing surface pollutants in the early stages of rainfall is called primary rainwater. This rainwater is highly polluted and requires purification. During the middle and late stages of a rainfall event, the surface has already been washed by the primary rainwater, and the surface pollutant content in the runoff rainwater is low. This rainwater is called clean rainwater and can be discharged directly into water bodies. The concentration of pollutants in surface runoff rainwater is correlated with rainfall duration. Pollutant concentrations in rainwater gradually decrease as continued rainfall washes the surface. Rainfall duration is often used in engineering to distinguish primary rainwater from clean rainwater.

[0003] At the beginning of rainfall, surface pollutants are discharged into the municipal stormwater pipes along with rainwater. If they are not intercepted and purified, they will cause serious pollution to the rivers and lakes around the city. The new version of the "Outdoor Drainage Design Standard" (GB50014-2021) proposes that urban sewage treatment plants should reserve the purification and treatment capacity of the initial rainfall. Intercepting the initial rainwater (including non-point source pollutants) from the municipal stormwater pipe network, connecting it to the municipal sewage pipe, and finally entering the urban sewage treatment plant for purification and treatment will become the mainstream technical route for the comprehensive treatment of non-point source pollutants. The initial rainwater interception well is an important part of the treatment of non-point source pollutants.

[0004] Currently, primary rainwater interception wells can be categorized into two types: traditional extensive interception wells and smart interception wells. Traditional extensive interception wells draw on the interception concept of sewage interception wells at the end of urban combined sewer networks, using lower grooves or weirs to divert primary rainwater into sewer pipes. However, clean rainwater in the middle and later stages of rainfall is uncontrolled, and large amounts of clean rainwater enter sewer pipes, reducing the COD concentration in the sewage, hindering the stable operation and maintenance of urban sewage treatment plants and even causing tailwater to exceed standards. Smart interception wells require the installation of online water quality monitoring instruments such as COD, conductivity, and turbidity meters. Electronically controlled valves or gates are also installed on the primary rainwater and clean rainwater outlet pipes. Water quality monitoring instruments distinguish between primary rainwater and clean rainwater, and the electronically controlled valves are activated and closed, thereby achieving the goal of connecting primary rainwater to the sewer network and discharging clean rainwater into urban water bodies. However, smart primary rainwater interception wells often occupy a large area, have complex control systems, lack stability, are expensive, and require complex management and maintenance. Summary of the Invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides an initial rainwater interception well that can control the flow of initial rainwater and clean rainwater in different stages without the need for electronic control equipment.

[0006] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0007] A rainwater interception well, comprising: a well body forming a well cavity, the well cavity comprising a water distribution well and a power well separated from each other, the well wall of the water distribution well being provided with a sewage interception hole and a water inlet hole connected to the power well, and an opening control structure for adjusting the opening and closing degree of the sewage interception hole being installed at the sewage interception hole, the well cavity being connected to a clean rainwater outlet pipe, the water inlet level of rainwater from the water distribution well entering the clean rainwater outlet pipe being higher than the water inlet hole and the sewage interception hole; a liquid level sensing structure being provided in the power well and being transmission-connected to the opening control structure, the liquid level sensing structure being able to rise and fall with changes in the liquid level height of the power well, and on at least part of the lifting and lowering path of the liquid level sensing structure, the rise of the liquid level sensing structure can link the opening control structure to reduce the opening degree of the sewage interception hole.

[0008] Furthermore, it also includes a flow control gate, which is placed in the water distribution well and can be raised and lowered to adjust its position to control the opening degree of the water inlet hole.

[0009] Furthermore, an adjustment chain is connected to the upper end of the flow control gate, an anchor hook is fixed in the well cavity and is located above the flow control gate, and chain links at different positions on the adjustment chain are hung on the anchor hook to achieve height adjustment of the flow control gate.

[0010] Furthermore, the opening control structure is a sewage interception hole gate placed in the water distribution well, and the well wall of the water distribution well is provided with a lifting ring located above the sewage interception hole. The sewage interception hole gate and the liquid level sensing structure are connected by a transmission chain passing through the lifting ring.

[0011] Furthermore, the bottom of the water inlet end of the sewage interception hole is higher than the bottom of the water inlet end of the water inlet hole.

[0012] Furthermore, the well cavity also includes a clean rainwater well, which is connected to the water distribution well. The wall of the water distribution well is connected to a rainwater inlet pipe, and the water inlet end of the clean rainwater outlet pipe extends to the wall of the clean rainwater well.

[0013] Furthermore, the bottom of the clean rainwater well is separated from the water distribution well by a partition wall. The bottom of the clean rainwater well is filled with a filling layer, and the upper surface of the filling layer is flush with the upper end of the partition wall and the bottom of the water inlet end of the clean rainwater outlet pipe.

[0014] Furthermore, the well cavity also includes a sewage interception control well, the water outlet end of the sewage interception hole extends to the sewage interception control well, the sewage interception control well is connected to the initial rainwater outlet pipe, and the bottom of the power well is connected to the sewage interception control well through an emptying pipe.

[0015] Furthermore, it also includes a cleaning structure, which can move in the drain pipe to clean the inner wall of the drain pipe.

[0016] The present invention also provides a method for controlling initial rainwater interception, comprising the following steps:

[0017] S1, according to the rainstorm intensity formula of the target area, obtain the rainfall duration t3 corresponding to the initial rainfall h in the target area;

[0018] S2, based on the water collection time t1 of the farthest water collection facility within the service area corresponding to the initial rainwater interception well, the transfer time t2 of the rainwater collected by the farthest water collection facility to the initial rainwater interception well, and the rainfall duration t3 obtained in step S1, obtain the total water collection time T within the service area corresponding to the interception well;

[0019] S3, adjust the opening of the power well water inlet hole so that when the initial rainfall is h, the power well is filled with water in the time T;

[0020] S4, conduct rainwater testing on the initial rainwater interception well and conduct water quality testing on the rainwater that has just flowed into the clean rainwater outlet pipe;

[0021] S5, if the water quality exceeds the standard, reduce the opening of the water inlet hole and extend the water filling time of the power well;

[0022] S6, repeat steps S4 and S5 until the water quality meets the standard.

[0023] The present invention has the following beneficial effects: the liquid level sensing structure is linked to the up and down movement of the opening control structure to realize the switching of the sewage interception hole between opening and closing, and to adjust the opening and closing degree of the sewage interception hole. The interception well does not need to be equipped with online water quality detection instruments such as COD, conductivity, and turbidity meters, and can realize the interception of initial rainwater; after the rainwater is poured in, the liquid level sensing structure gradually rises, and the opening degree of the sewage interception hole gradually decreases until, after a period of time, the sewage interception hole is closed. At this time, with the passage of time and the continuous scrubbing of the ground by rainwater, the rainwater has become clean rainwater. Since the sewage interception hole is closed, the liquid level continues to rise until it is discharged from the clean rainwater outlet pipe, and the clean rainwater is directly discharged into the urban water body; the treatment of initial rainwater and clean rainwater in different flow paths in stages is realized; the pollution of water bodies by initial rainwater is minimized to the greatest extent; at the same time, there is no need to install electric control valves or gates, no external power is required, and it has a wide range of applications, is low-carbon and energy-saving, has low construction costs, and is easy to maintain. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0025] Figure 1 A top cross-sectional view of an embodiment of an initial rainwater interception well of the present invention;

[0026] Figure 2 for Figure 1 AA cross-sectional view;

[0027] Figure 3 for Figure 1 A schematic diagram of another state of;

[0028] Figure 4 for Figure 1 Cross-sectional view at BB;

[0029] Figure 5 for Figure 1 Cross-sectional view at CC;

[0030] Figure 6 This is a partial structural diagram of another embodiment of an initial rainwater interception well of the present invention;

[0031] Figure 7 for Figure 6 Cross-sectional view at DD;

[0032] Figure 8 for Figure 6 A schematic diagram of another state of;

[0033] Figure 9 It is a cross-sectional view of the interior of the exhaust pipe;

[0034] Figure 10 for Figure 9 EE section view;

[0035] Figure 11 Schematic diagram of the cleaning structure.

[0036] Description of Figure Numbers:

[0037] Well body 100, rainwater inlet pipe 101, clean rainwater outlet pipe 102, initial rainwater outlet pipe 103, water distribution well 110, power well 120, sinking trough 121, sewage interception control well 130, diversion slope 131, water inlet hole 140, sewage interception hole 150, sewage interception hole gate 160, clean rainwater well 170, partition wall 171, filling layer 172, drain pipe 180, guide rod 181, connecting part 182, grid baffle 190;

[0038] Liquid level sensing structure 200, transmission chain 210, lifting ring 220, first connecting chain 230, second connecting chain 240;

[0039] Flow control gate 300, adjustment chain 310;

[0040] Cleaning structure 400 , sliding sleeve 410 , scraper bar 420 , pointed protrusion 421 , and serial chain 430 .

[0041] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0042] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0043] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0044] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0045] In addition, the descriptions of "first", "second", etc. in the present invention are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0046] Please refer to the attached Figures 1 to 4 The present invention provides an initial rainwater interception well, including a well body 100 and a liquid level sensing structure 200.

[0047] The well body 100 forms a well cavity, which is located underground. A wellbore is provided at the upper end of the well cavity. A wellhead is provided at the upper end of the wellbore to facilitate manual access to the well cavity for construction and maintenance. For this purpose, a ladder is provided on the well wall corresponding to the wellhead. A wellhead cover is provided at the wellhead to prevent pedestrians and debris from entering the well cavity through the wellhead. In addition, a fall prevention net can be provided at the wellhead to prevent pedestrians from falling into the well if the wellhead cover is damaged or removed.

[0048] The well cavity includes a water distribution well 110 and a power well 120 separated from each other. The well wall of the water distribution well 110 is provided with a sewage interception hole 150 and a water inlet hole 140 connected to the power well 120. The sewage interception hole 150 and the water inlet hole 140 can be provided on the opposite side walls of the water distribution well 110. The water inlet hole 140 is provided on the partition wall shared by the water distribution well 110 and the power well 120, and the sewage interception hole 150 is provided with an opening for adjusting the opening and closing degree of the sewage interception hole 150. The control structure is that the well cavity is connected to the clean rainwater outlet pipe 102. The water inlet liquid level of the rainwater from the water distribution well 110 entering the clean rainwater outlet pipe 102 is higher than the water inlet hole 140 and the sewage interception hole 150, so that the rainwater flowing into the clean rainwater outlet pipe 102 has the lowest priority. The rainwater that begins to enter the water distribution well 110 will first enter the sewage interception hole 150 and the water inlet hole 140, thereby avoiding the rainwater with a high degree of initial pollution from being discharged from the clean rainwater outlet pipe 102.

[0049] The liquid level sensing structure 200 is arranged in the power well 120. The liquid level sensing structure 200 is connected to the opening control structure by transmission. The liquid level sensing structure 200 can move up and down as the liquid level height of the power well 120 changes. Moreover, on at least part of the lifting and lowering path of the liquid level sensing structure 200, the rise of the liquid level sensing structure 200 can link the opening control structure to reduce the opening degree of the sewage interception hole 150. Specifically, the liquid level sensing structure 200 can be a float that can change with the liquid level height. The float can be made of metal and be hollow inside. Of course, in other embodiments, the liquid level sensing structure 200 can be other structures with floating capabilities. In addition, it is not required that the liquid level sensing structure 200 can be linked to the opening control structure on all its moving paths. For example, refer to Figure 3 When the liquid level sensing structure 200 rises to the point where the opening control structure completely closes the sewage intercepting hole 150 and the opening control structure cannot continue to descend, the liquid level sensing structure 200 may continue to rise with the liquid level, but cannot continue to drive the opening control structure to descend.

[0050] The present invention utilizes a liquid level sensing structure 200 to link the vertical movement of the opening control structure, switching the interception hole 150 between open and closed, and adjusting the degree of opening and closing. This interception well eliminates the need for online water quality monitoring instruments such as COD, conductivity, and turbidity meters, and can intercept initial rainwater. After rainwater enters the water distribution well 110 and then flows into the power well 120, the interception hole 150 is now at its maximum opening, allowing the initial rainwater to be discharged through the interception hole 150. As the liquid level in the power well 120 gradually rises, the liquid level sensing structure 200 rises, and the linkage opening control structure reduces the opening of the sewage interception hole 150 until a period of time passes, and the sewage interception hole 150 is closed. At this time, with the passage of time and the continuous washing of rainwater on the ground, the rainwater has become clean rainwater. Since the sewage interception hole 150 is closed, the liquid level continues to rise until it is discharged from the clean rainwater outlet pipe, and the clean rainwater can be directly discharged into the urban water body; the treatment of different flow paths of initial rainwater and clean rainwater is realized; the pollution of water bodies by initial rainwater is minimized. At the same time, there is no need to install electric control valves or gates, no external power is connected, it has a wide range of applications, is low-carbon and energy-saving, has low construction costs, and is easy to maintain.

[0051] As a preferred embodiment of the present invention, it also includes a flow control gate 300. The flow control gate 300 is placed in the water distribution well 110 and can be raised and lowered to adjust its position to control the opening of the water inlet 140. The flow control gate 300 is close to or fits the wall of the water distribution well 110. By raising and lowering, it controls the opening of the water inlet, thereby adjusting the liquid level rising and falling speed of the power well 120, thereby controlling the closing time of the sewage interception hole 150, and thus adjusting the time when rainwater enters the clean rainwater outlet pipe 102, so as to achieve the time adjustment of rainwater flowing into the sewage interception hole 150 and clean rainwater entering the clean rainwater outlet pipe 102. It can be adjusted according to actual conditions to improve adaptability. By adjusting the opening of the water inlet 140 and controlling the water filling time of the power well 120, it is possible to accurately distinguish between initial rainwater and clean rainwater from the rainfall duration dimension.

[0052] Further, refer to Figure 2 The upper end of the flow control gate 300 is connected to an adjustment chain 310, and an anchor hook is fixed in the well cavity above the flow control gate 300. Chain links at different positions on the adjustment chain 310 are hung on the anchor hook to achieve height adjustment of the flow control gate 300. Specifically, the adjustment chain 310 is composed of multiple chain links in series. One end of the anchor hook is inserted into the well wall of the well cavity and can be fixed by an expansion bolt. The other end is provided with a hook to hook the chain link to prevent the chain link from detaching from the anchor hook. Preferably, the anchor hook is set close to the wellhead, which is convenient for manual operation after opening the well cover without having to go deep into the well. In addition, the wall of the water distribution well 110 can also be provided with a slide groove for the flow control gate 300 to slide up and down, so as to guide the lifting and lowering of the flow control gate 300.

[0053] Furthermore, the opening control structure comprises a sewage interception hole gate 160 placed within the water distribution well 110. A lifting ring 220 is provided on the wall of the water distribution well 110, positioned above the sewage interception hole 150. The sewage interception hole gate 160 is connected to the liquid level sensing structure 200 via a transmission chain 210 passing through the lifting ring 220. The lifting ring 220 is used to suspend the sewage interception hole gate 160. The transmission chain 210 extends upward from the liquid level sensing structure 200, bypassing or passing through the wall between the water distribution well 110 and the power well 120, and then passes through the lifting ring 220 to connect with the sewage interception hole gate 160. During the raising and lowering process, the sewage interception hole gate 160 approaches or abuts against the inner wall of the water distribution well 110, thereby adjusting the opening of the sewage interception hole 150. The wall of the water distribution well 110 may also be provided with a slide groove for the sewage interception hole gate 160 to slide and guide the raising and lowering of the sewage interception hole gate 160. The liquid level sensing structure 200 is raised or lowered by the transmission chain 210 and the lifting ring 220, thereby lowering or raising the sewage interception gate 160. Specifically, the gravity of the sewage interception gate 160 is greater than its own buoyancy, and the buoyancy of the liquid level sensing structure 200 is greater than its own gravity. Furthermore, the gravity of the liquid level sensing structure 200 is greater than that of the sewage interception gate 160. Through the interaction of gravity and buoyancy, the sewage interception gate 160 is controlled.

[0054] Of course, in other embodiments, the opening control structure may also be a valve, and the liquid level sensing structure 200 is connected to the control mechanism of the valve through a transmission structure to control the opening of the valve.

[0055] Furthermore, the bottom of the water inlet end of the sewage interception hole 150 is higher than the bottom of the water inlet end of the water inlet hole 140. That is, after water enters the water distribution well 110, it preferentially enters the power well 120 through the water inlet hole 140, ensuring the stability of water inflow into the power well 120, so that the liquid level sensing structure 200 and the opening control structure that cooperate with the liquid level of the power well can function stably. Specifically, the bottom of the water inlet hole 140 is flush with the bottom wall of the water distribution well 110, and the bottom of the sewage interception hole 150 is higher than the bottom wall of the water distribution well 110. For example, the bottom of the sewage interception hole 150 is 50 mm higher than the bottom wall of the water distribution well 110. This can be adaptively adjusted according to actual conditions and is not specifically limited here.

[0056] Furthermore, the well cavity also includes a clean rainwater well 170, which is connected to the water distribution well 110. The wall of the water distribution well 110 is connected to a rainwater inlet pipe 101, and the water inlet end of the clean rainwater outlet pipe 102 extends to the wall of the clean rainwater well 170. Rainwater enters the water distribution well 110 from the rainwater inlet pipe 101. When the liquid level of the water distribution well 110 reaches a certain height, the rainwater enters the clean rainwater well 170 and is finally discharged from the clean rainwater outlet pipe 102.

[0057] In order to prevent rainwater from disturbing the transmission chain 210 , the transmission chain 210 is passed over the rainwater inlet pipe 101 so that rainwater entering the rainwater inlet pipe 101 will not directly impact the transmission chain 210 .

[0058] Further, refer to Figure 5 The bottom of the clean rainwater well 170 is separated from the water distribution well 110 by a partition wall 171. The bottom of the clean rainwater well 170 is filled with a filling layer 172. The upper surface of the filling layer 172 is flush with the upper end of the partition wall 171 and the bottom of the water inlet end of the clean rainwater outlet pipe 102. In this way, the rainwater entering the clean rainwater well 170 can be discharged directly from the clean rainwater outlet pipe 102, avoiding long-term accumulation of rainwater in the clean rainwater well 170, which makes the well continuously moist, breeds bacteria, and hinders manual maintenance in the well.

[0059] The well cavity also includes a sewage interception control well 130. The outlet end of the sewage interception hole 150 extends to the sewage interception control well 130. The sewage interception control well 130 is connected to the initial rainwater outlet pipe 103. The bottom of the power well 120 is connected to the sewage interception control well 130 through the drain pipe 180. After the rain stops, the rainwater from the power well 120 can be discharged into the sewage interception control well 130 through the drain pipe 180, and finally discharged into the subsequent pipeline from the initial rainwater outlet pipe 103. The sewage interception control well 130 is used to collect rainwater flowing into the drain pipe 180 and the sewage interception hole 150 and finally discharge it from the initial rainwater outlet pipe 103, introducing the initial rainwater into the subsequent sewage treatment plant for purification.

[0060] Reference Figure 1 and Figure 4 Specifically, the sewage interception control well 130, the water distribution well 110 and the power well 120 are located on the same side of the clean rainwater well 170 and are separated by walls. The wall between the clean rainwater well 170 and the sewage interception control well 130, and the wall between the clean rainwater well 170 and the power well 120 are higher than the partition wall 171 and the top of the rainwater inlet pipe 101, so as to prevent rainwater entering the clean rainwater well 170 from easily flowing into the sewage interception control well 130 and the power well 120.

[0061] Further, refer to Figure 2 The bottom of the initial rainwater outlet pipe 103 at the water inlet is flush with the bottom wall of the sewage interception control well 130. This allows the pipe to drain the rainwater from the sewage interception control well 130 after the rain stops, reducing water accumulation. A diversion slope 131 is provided at the bottom of the sewage interception control well 130. This slope extends downward toward the initial rainwater outlet pipe 103, directing rainwater into the pipe and draining it as cleanly as possible.

[0062] Specifically, the bottom of the outlet end of the rainwater inlet pipe 101 is higher than or flush with the bottom of the inlet end of the clean rainwater outlet pipe 102 to prevent rainwater from remaining and accumulating in the upstream pipeline.

[0063] The working principle of the initial rainwater interception well is as follows:

[0064] During the initial rainfall period, surface runoff enters rainwater inlet pipe 101 through the stormwater inlet and drains into distribution well 110. Because the bottom elevation of distribution well 110 is higher than that of power well 120 and sewage interception and control well 130, and the bottom elevation of the power well's inlet hole 140 is lower than that of the sewage interception hole 150, the initial rainwater in distribution well 110 flows preferentially into power well 120.

[0065] 2. The liquid level sensing structure 200 (float) in the power well 120 floats up, and the opening control structure (sewage interception hole gate 160) moves down, gradually closing the sewage interception hole 150. The sewage interception control well 130 completes the initial rainwater interception, and the clean rainwater enters the clean rainwater well 170 and is discharged into the downstream municipal rainwater pipe through the clean rainwater outlet pipe 102.

[0066] 3. When the rain stops, the accumulated water in the power well 120 is discharged into the sewage interception control well 130 through the drain pipe 180. The liquid level sensing structure 200 (float) drops, the sewage interception hole gate 160 is pulled back, the sewage interception hole 150 is gradually opened, and the sewage interception control well 130 resumes its sewage interception capacity.

[0067] When there is very little rainfall, rainwater washes the ground and flows into the water distribution well 110, causing serious rainwater pollution. The rainwater flowing into the water distribution well 110 flows into the power well 120 from the water inlet hole 140, but the water inflow into the power well 120 is less than the water discharge capacity of the drain pipe 180. The liquid level sensing structure 200 (float) does not work, the sewage interception hole 150 is always open, and the sewage flowing into the power well 120 also flows into the sewage interception control well 130 from the drain pipe 180. All surface runoff rainfall is intercepted and diverted to the sewage network.

[0068] And when the rain is heavier, the ground can be washed quickly. The heavier the rain is, the faster the rainwater entering the water distribution well 110 becomes clean rainwater, and the shorter the initial rainwater time is. The heavier the rain is, the faster the liquid level sensing structure 200 (float) in the power well 120 floats up, the faster the sewage interception hole 150 closes, and the initial rainwater interception is completed faster, which corresponds to the faster the rainwater entering the water distribution well 110 becomes clean rainwater, realizing adaptive regulation; avoiding the situation where the initial rainwater interception time is long when the rain is heavy, resulting in a large amount of clean rainwater being discharged into the sewage pipe network, thereby increasing the load of the sewage pipe network.

[0069] Further, refer to Figure 6 , also includes a cleaning structure 400, which can move in the drain pipe 180 to clean the inner wall of the drain pipe 180 to prevent the drain pipe 180 from being blocked and affecting the drainage of the power well 120.

[0070] Specifically, refer to Figure 9 and Figure 11 The cleaning structure 400 includes a sliding sleeve 410 and a scraper 420. The scraper 420 is fixed to the outer wall of the sliding sleeve 410 and is arranged at intervals along the circumferential direction. A coaxial guide rod 181 is provided at the center of the drain pipe 180. The sliding sleeve 410 is sleeved on the guide rod 181 and can move along the guide rod 181. There is a gap between the scraper 420 and the inner wall of the drain pipe 180 to reduce sliding resistance. The scraper 420 moves along the guide rod 181 to clean the dirt accumulated on the inner wall of the drain pipe 180.

[0071] The movement of the cleaning structure 400 can be realized by using a motor or other power mechanism. Figures 6 to 8 In order to reduce the use of electronic components, the cleaning structure 400 can move back and forth in the drain pipe 180 as the liquid level sensing structure 200 rises and falls, so as to clean the inner wall of the drain pipe 180. Figure 6 and Figure 8 As shown, the liquid level sensing structure 200 (float) is connected to both ends of the cleaning structure 400 through the first connecting chain 230 and the second connecting chain 240; one end of the first connecting chain 230 is connected to the cleaning structure 400, and the other end extends from the drain pipe 180 toward the pipe mouth of the power well 120 and is connected to the liquid level sensing structure 200 (float); one end of the second connecting chain 240 is connected to the cleaning structure 400, and the other end is connected to the liquid level sensing structure 200 (float), and the second connecting chain 240 extends from the drain pipe 180 toward the pipe mouth of the sewage interception control well 130, and after extending upward, it horizontally passes through the partition wall between the sewage interception control well 130 and the water distribution well 110, and the partition wall between the power well 120 and the water distribution well 110, enters the power well 120 to connect with the liquid level sensing structure 200 (float), and the second connecting chain 240 bypasses above the rainwater inlet pipe 101. To simplify the structure, one end of the second connecting chain 240 is connected to the transmission chain 210 to share a portion of the length of the transmission chain 210. It is understood that to reduce the extension path of the second connecting chain 240 and the transmission chain 210, holes can be drilled in the corresponding wall to allow the second connecting chain 240 and the transmission chain 210 to pass through. To reduce resistance, steering wheels can be provided at the turning points of the extension paths of the first connecting chain 230, the second connecting chain 240, and the transmission chain 210.

[0072] In addition, further, Figure 9As shown, to prevent the short travel of the liquid level sensing structure 200 (float) from preventing a single sliding sleeve 410 from covering the drain pipe 180, multiple groups of sliding sleeves 410 and scrapers 420 are provided and arranged along the guide rod 181. Adjacent sliding sleeves 410 are connected by series chains 430. The first connecting chain 230 is connected to the sliding sleeve 410 closest to the power well 120, and the second connecting chain 240 is connected to the sliding sleeve 410 closest to the sewage interception control well 130. This allows for more comprehensive cleaning of the drain pipe 180.

[0073] To improve the sliding smoothness of the cleaning structure 400, in some embodiments, balls may be embedded in the inner wall of the sliding sleeve 410 or the outer wall of the guide rod 181 to convert sliding friction into rolling friction, thereby reducing frictional resistance. Of course, other methods can also be used to reduce friction, such as smoothing the inner wall of the sliding sleeve 410 and the outer wall of the guide rod 181.

[0074] It should be noted that the cleaning of the cleaning structure 400 is not that the scraper bar 420 directly scrapes out the dirt on the inner wall of the drain pipe 180, but scrapes the dirt on the inner wall of the drain pipe 180 away from the inner wall of the drain pipe 180, so that the dirt does not adhere to the inner wall of the drain pipe 180. After the scraper bar 420 loosens the dirt, it can be discharged from the drain pipe 180 with the water flow. Obviously, the resistance encountered in scraping the dirt loose is much smaller than the resistance encountered in scraping the dirt out of the drain pipe 180, thereby avoiding the cleaning structure 400 from being stuck or being subjected to greater resistance. In addition, since the initial rainwater enters the power well 120 first, the rainwater will fill the drain pipe 180 and will first moisten the dirt adhering to the drain pipe 180. As the water level gradually rises, the liquid level sensing structure 200 (float) will drive the sliding sleeve 410 and the scraper 420 to move. At this time, the dirt has been moistened by the rainwater first and is easily loosened by the scraper 420, with weaker resistance. The loosened dirt will also be immediately discharged to the sewage interception control well 130 with the water flow of the drain pipe 180. By utilizing the structural characteristics of rainwater and the interception well, the effects of rainwater moistening the dirt, loosening the dirt, and immediately flushing the loosened dirt with the water flow are achieved in turn. The sequence of steps is coordinated and reasonable, thereby reducing the activity resistance of the cleaning structure 400 and quickly flushing the loosened dirt, achieving a better cleaning effect. In addition, it is understandable that the drainage of the drain pipe 180 has little effect on the liquid level of the power well 120 when rainwater is poured in, and can be ignored. Only when the rain stops or the rainwater is very light, that is, the water inflow of the water inlet hole 140 is less than the drainage of the drain pipe 180, the liquid level of the power well 120 will not rise, but will slowly drop. When the rainwater is light, the rainwater is more polluted and needs to be completely discharged into the sewage interception control well 130. The drain pipe 180 can achieve this purpose. In addition, the resistance of the cleaning structure 400 has no substantial effect on the rise and fall of the liquid level sensing structure 200 (float) and its linkage with the opening control structure, and does not affect the operation of the liquid level sensing structure 200 (float). The most important function of reducing the resistance of the cleaning structure 400 is to prevent the scraper bar 420 from being deformed or damaged by the large resistance.

[0075] Reference Figure 10 Furthermore, in order to reduce structural interference, the scraper 420 is provided with sharp protrusions 421 on the sides facing toward and away from the power shaft 120. First, the sharp protrusions 421 have a better scraping effect on dirt and less resistance. In addition, when solid debris blocks the scraper, the sharp protrusions 421 come into contact with the solid debris. Due to the inclined surface of the sharp protrusions 421, the scraper 420 and the sliding sleeve 410 rotate around the guide rod 181 to avoid the solid debris, so that the solid debris passes through the gap between the scraper bars 420.

[0076] In the municipal drainage system, a rainwater inspection well is usually set up before the initial rainwater interception well of the present invention. The rainwater inspection well adopts a sedimentation well, which will collect most of the solid impurities. Figure 6 and Figure 7In order to further reduce the amount of larger solid debris entering the drain pipe 180, a mesh baffle 190 is provided at the mouth of the drain pipe 180 facing the power well 120. A sinking trough 121 is provided on the bottom wall of the power well 120 below the mouth of the drain pipe 180 to allow larger solid debris to settle in the sinking trough 121. During manual maintenance, the material in the sinking trough 121 can be regularly cleared. There is a water-passing gap with an opening facing downward between the mesh baffle 190 and the wall of the power well 120 to prevent the mesh baffle 190 from being blocked and losing water flow capacity. In addition, the two ends of the guide rod 181 are connected and fixed to the drain pipe 180 by a connecting portion 182. The connecting portions 182 at both ends can also limit the sliding sleeve 410 to prevent it from detaching from the guide rod 181. The connecting portion 182 and the drain pipe 180 can be detachably connected by fasteners (screws, bolts, etc.) to facilitate the installation of the cleaning mechanism. In addition, in order to reduce wear, the grid baffle 190 and the connecting portion 182 are provided with clearance holes for the first connecting chain 230 or the second connecting chain 240 to pass through.

[0077] When the liquid level rises, the liquid level sensing structure 200 (float) rises accordingly and pulls the cleaning structure 400 toward the power well 120 through the first connecting chain 230. When the liquid level drops, the liquid level sensing structure 200 (float) drops accordingly and pulls the cleaning structure 400 toward the sewage interception control well 130 through the second connecting chain 240. In this way, the reciprocating motion of the cleaning structure 400 is driven by the rise and fall of the liquid level sensing structure 200 (float), thereby cleaning the dirt accumulated on the inner wall of the drain pipe 180.

[0078] The present invention also provides a method for controlling initial rainwater interception, comprising the following steps:

[0079] The steps include:

[0080] S1, according to the rainstorm intensity formula of the target area, obtain the rainfall duration t3 corresponding to the initial rainfall h in the target area;

[0081] S2, based on the water collection time t1 of the farthest water collection facility within the service range corresponding to the initial rainwater interception well, the transfer time t2 of the rainwater collected by the farthest water collection facility to the initial rainwater interception well, and the rainfall duration t3 obtained in step S1, obtain the total water collection time T within the service range corresponding to the interception well. T = t1 + t2 + t3, T is also the closing time of the opening control structure (the interception hole gate 160), and the initial rainwater interception well completes the initial rain interception; when it rains, the rainwater on the ground will not flow into the corresponding water collection facility immediately, but it will take a period of time for the ground rainwater to accumulate before the rainwater will flow into the water collection facility, and the rainwater accumulation period is the water collection time t1, which can usually be 5-10 minutes. The water collection range corresponding to a water collection facility (such as a ground drain) is controlled at 50-100m, which can be appropriately selected according to actual conditions;

[0082] S3, adjust the opening degree of the power well water inlet hole 140 so that the power well is filled with water for a time T when the initial rainfall is h;

[0083] S4, conduct a rainwater test on the initial rainwater intercepting well, and conduct a water quality test on the rainwater that has just flowed into the clean rainwater outlet pipe 102; specifically, by conducting a rainwater test on the initial rainwater intercepting well under the condition of natural rainstorm precipitation, as the opening control structure (the sewage interception hole gate 160) is closed, the liquid level of the water distribution well 110 begins to rise until the rainwater enters the clean rainwater outlet pipe 102, and the clean rainwater is discharged from the clean rainwater outlet pipe 102. The water quality test is conducted on the rainwater that has just flowed into the clean rainwater outlet pipe 102, and whether the water quality of the clean rainwater meets the standard for direct discharge can be detected. The water quality test indicators include COD, SS, TP, TN, ammonia nitrogen and other water quality index tests.

[0084] S5, if the water quality exceeds the standard, reduce the opening degree of the water inlet hole 140 and extend the water filling time of the power well 120;

[0085] S6, repeat steps S4 and S5 until the water quality meets the standard.

[0086] In order to minimize the amount of clean rainwater entering the sewage interception control well 130, if the water quality in step S4 meets the standard, the opening of the water inlet hole 140 can be gradually increased, and the water quality of the rainwater just flowing into the clean rainwater outlet pipe 102 after each adjustment can be tested until the water quality exceeds the standard. The opening of the water inlet hole 140 in the second-to-last experiment is then taken as the optimal opening of the water inlet hole 140. That is, the water quality in the last experiment exceeds the standard, while the water quality in the second-to-last experiment meets the standard. This means that the opening of the water inlet hole 140 in the second-to-last experiment can more accurately separate the initial rainwater from the clean rainwater, preventing the initial rainwater from entering the clean rainwater outlet pipe 102 and preventing a large amount of clean rainwater from entering the sewage interception control well 130. In step S3, the initial value of the opening of the water inlet hole 140 is set by taking the total water collection time T as the target, so as to avoid the initial setting of the opening of the water inlet hole 140 being close to the appropriate opening of the water inlet hole 140, thereby avoiding excessive subsequent experiments and wasting time.

[0087] Specifically, the rainstorm intensity formula in step S1 is:

[0088]

[0089] q is the design rainstorm intensity, unit is L / (s·hm 2), A1, C, b and n are local parameters of the rainstorm intensity formula; t is the rainfall duration, in min, and P is the designed rainstorm recurrence period. In this embodiment, the designed rainstorm recurrence period is set to 1 year, and the time duration to reach the initial rainfall h is calculated. The rainfall corresponding to each rainfall duration ti is hi (mm / min), h = ∑hi, and the rainfall duration t3 = ∑ti (min) corresponding to the initial controlled rainfall h is reached. The initial rainfall h can be 6 to 12 mm. The lower limit is taken for areas with low surface pollution, and the upper limit is taken for areas with high surface pollution. The h value can be selected according to the surface pollution level of the target area. Take Changsha as an example: Changsha rainstorm intensity formula:

[0090]

[0091] Assume that the initial rainfall of a certain plot is h = 9.7 mm, P = 1 year, and calculate the corresponding rainfall in mm / min at t = 1 min, 2 min, 3 min, etc., as shown in Table 1.

[0092]

[0093] Table 1

[0094] At the end of the 5th minute, the cumulative rainfall h = 9.721 mm, close to the initial rainfall of 9.7 mm that needs to be controlled. Therefore, t3 = 5 minutes for this plot.

[0095] In step S3, the power well water filling time T = V / Q, V is the power well water filling volume (m 3 ), Q is the water flow rate of the water inlet 140 (m 3 / s). When the water head before the water inlet 140 is not higher than the opening height of the water inlet, the flow rate of the water inlet is calculated according to the weir flow: Q = δ C mb(2g) 0.5 (H0 1.5 ), where δ C is the contraction coefficient of the water inlet hole 140, and δ is taken for a single hole C =1; m is the free overflow flow coefficient, which is related to boundary conditions such as weir shape and weir height, and is taken as m=0.32; b is the width of the flow hole (m), and g is the acceleration of gravity, g=9.8m / s 2 , H0 is the water depth of the flow hole (m). The square inlet hole width b is the design value. The flow depth H0 of the water inlet hole 140 is determined by adjusting the flow control gate 300. Under high-intensity rainfall (heavy rain, rainstorm), the water head in front of the water inlet hole 140 increases, forming a gate hole outflow, increasing the Q value, shortening the power well filling time and the sewage interception hole closing time. In other words, the sewage interception time is adaptively adjusted according to rainfall intensity.

[0096] The above are only preferred embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention description and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. An initial rainwater interception well, characterized in that: include: A well body (100) is formed with a well cavity, the well cavity comprising a water distribution well (110) and a power well (120) separated from each other, a sewage interception hole (150) and a water inlet hole (140) connected to the power well (120) are provided on the well wall of the water distribution well (110), and an opening control structure for adjusting the opening and closing degree of the sewage interception hole (150) is installed at the sewage interception hole (150), the well cavity is connected to a clean rainwater outlet pipe (102), and the water inlet level of rainwater from the water distribution well (110) entering the clean rainwater outlet pipe (102) is higher than the water inlet hole (140) and the sewage interception hole (150); A liquid level sensing structure (200) is provided in the power well (120) and is transmission-connected to the opening control structure. The liquid level sensing structure (200) can move up and down as the liquid level of the power well (120) changes. In addition, on at least a portion of the lifting and lowering path of the liquid level sensing structure (200), the liquid level sensing structure (200) can rise and link the opening control structure to reduce the opening degree of the sewage interception hole (150). It also includes a flow control gate (300), which is placed in the water distribution well (110) and can be raised and lowered to adjust its position to control the opening degree of the water inlet hole (140), thereby adjusting the liquid level raising and lowering speed of the power well (120).

2. The initial rainwater interception well according to claim 1, characterized in that: The upper end of the flow control gate (300) is connected to an adjustment chain (310), an anchor hook located above the flow control gate (300) is fixed in the well cavity, and chain links at different positions on the adjustment chain (310) are hung on the anchor hook to achieve height adjustment of the flow control gate (300).

3. The initial rainwater interception well according to claim 1, characterized in that: The opening control structure is a sewage interception hole gate (160) disposed in a water distribution well (110); a lifting ring (220) located above the sewage interception hole (150) is provided on the wall of the water distribution well (110); and the sewage interception hole gate (160) and the liquid level sensing structure (200) are connected via a transmission chain (210) passing through the lifting ring (220).

4. The initial rainwater interception well according to claim 1, characterized in that: The bottom of the water inlet end of the sewage interception hole (150) is higher than the bottom of the water inlet end of the water inlet hole (140).

5. The initial rainwater interception well according to claim 1, characterized in that: The well cavity further comprises a clean rainwater well (170), the clean rainwater well (170) being in communication with the water distribution well (110), the wall of the water distribution well (110) being connected to a rainwater inlet pipe (101), and the water inlet end of the clean rainwater outlet pipe (102) extending to the wall of the clean rainwater well (170).

6. The initial rainwater interception well according to claim 5, characterized in that: The bottom of the clean rainwater well (170) is separated from the water distribution well (110) by a partition wall (171). The bottom of the clean rainwater well (170) is filled with a filling layer (172). The upper surface of the filling layer (172) is flush with the upper end of the partition wall (171) and the bottom of the water inlet end of the clean rainwater outlet pipe (102).

7. The initial rainwater interception well according to claim 1, characterized in that: The well cavity further comprises a sewage interception control well (130), the water outlet end of the sewage interception hole (150) extends to the sewage interception control well (130), the sewage interception control well (130) is connected to an initial rainwater outlet pipe (103), and the bottom of the power well (120) is connected to the sewage interception control well (130) via an emptying pipe (180).

8. The initial rainwater interception well according to claim 7, characterized in that: It also includes a cleaning structure (400), which can move in the drain pipe (180) to clean the inner wall of the drain pipe (180).

9. A method for controlling initial rainwater interception, based on the initial rainwater interception well according to any one of claims 1 to 8, characterized in that: The steps include: S1, according to the rainstorm intensity formula of the target area, obtain the rainfall duration t3 corresponding to the initial rainfall h in the target area; S2, based on the water collection time t1 of the farthest water collection facility within the service area corresponding to the initial rainwater interception well, the transfer time t2 of the rainwater collected by the farthest water collection facility to the initial rainwater interception well, and the rainfall duration t3 obtained in step S1, obtain the total water collection time T within the service area corresponding to the interception well; S3, adjusting the opening degree of the power well water inlet hole (140) so that when the initial rainfall is h, the power well is filled with water for a time T; S4, conducting a rainwater test on the initial rainwater interception well and conducting a water quality test on the rainwater that has just flowed into the clean rainwater outlet pipe (102); S5, if the water quality exceeds the standard, the opening degree of the water inlet hole (140) is reduced to extend the water filling time of the power well (120); S6, repeat steps S4 and S5 until the water quality meets the standard.

Images