Double-ring multifunctional inspection well for tail end of intercepting type combined system and application method of double-ring multifunctional inspection well

Abstract

The invention provides a double-ring multifunctional inspection well used for the tail end of an intercepting type combined system and an application method, and belongs to the technical field of drainage inspection wells. The inspection well comprises an inner ring well and an outer ring well which are located on the inner layer and the outer layer respectively, and the inner ring well is formed through an inner ring well wall; the outer ring well is formed by an outer ring well wall and an inner ring well wall; the well wall of the inner ring well is provided with a water passing hole communicated with the outer ring well and the inner ring well, the inner ring well is provided with an inner ring well water inlet pipe and an inner ring well water outlet pipe, the outer ring well is provided with a confluence water inlet pipe and an overflow water outlet pipe, the water passing hole is located at the position away from the confluence water inlet pipe, and the side, facing the outer ring well, of the water passing hole is provided with a float valve. The multifunctional inspection well is divided into two parts, the outer ring well is divided into the water inlet area, the overflow area and the energy dissipation area, the inner ring well is divided into the connection area, the closure area and the water outlet area, the multifunctional inspection well can effectively prevent water immersion, the occupied area is saved, and the investment is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of municipal drainage, and in particular to a double-ring multifunctional inspection well for the end of an intercepting combined sewer system and an application method thereof. Background Art

[0002] At present, in the traditional intercepting combined sewer system, when the intercepting pipe is connected to the drainage main pipe, due to the deep burial depth of the main pipe, the connection height difference between the intercepting pipe and the drainage main pipe is large. Therefore, the system first sets up an intercepting well, then sets up a waterfall well, and finally sets up a three-way connection well to connect the drainage main pipe and the branch pipe connected to the intercepting pipe. This method will not only increase investment and floor space, but also cause difficulties in the project implementation stage, and finally cause inconvenience to management personnel in the operation stage. Summary of the invention

[0003] The present invention provides a double-ring multifunctional inspection well for the end of an interception-type combined sewer system and an application method, which solves the problem that it is difficult to add multiple inspection wells in a narrow area when the end of the interception-type combined sewer system intersects with the main pipe, and sequentially completes the three functions of interception, water drop, and connection. There are technical problems such as a large area occupied by the inspection well, increased project investment, and influence on later operation and maintenance. By transforming the four-way well, a multifunctional inspection well integrating water inlet, connection, interception, energy dissipation, overflow, water discharge, and mud sedimentation is created. The technical scheme is as follows:

[0004] A double-ring multifunctional inspection well for the end of a cut-off combined sewer system, comprising an inner ring well and an outer ring well arranged in inner and outer layers respectively, the inner ring well being formed by the inner ring well wall, the outer ring well being formed by the outer ring well wall and the inner ring well wall; the inner ring well wall being provided with a water hole connecting the outer ring well and the inner ring well, the inner ring well being provided with an inner ring well water inlet pipe and an inner ring well water outlet pipe, the outer ring well being provided with a relatively arranged combined water inlet pipe and an overflow water outlet pipe, the water hole being located away from the combined water inlet pipe, and a float valve being provided on the side of the water hole facing the outer ring well.

[0005] The water hole is located at the opposite side of the combined water inlet pipe and is lower than the overflow water outlet pipe.

[0006] The water hole is located below the overflow outlet pipe, and the bottom elevation is 70 mm to 120 mm higher than the bottom of the outer ring well.

[0007] The diameter of the inner ring well is determined according to the diameter of the inner ring well outlet pipe, and the bottom elevation of the inner ring well is determined according to the bottom elevation of the inner ring well outlet pipe minus 70mm to 120mm.

[0008] The water inlet direction of the outer ring well is arranged symmetrically with the direction of the water hole and the overflow pipe.

[0009] The outer ring well is a circular inspection well, which is a closed circular well formed by the outer ring well wall and the inner ring well wall; the inner ring well is a cylindrical inspection well, which is a closed cylindrical well formed by the inner ring well wall; the bottom elevation of the outer ring well is consistent with the bottom elevation of the inner ring well, and the diameter of the outer ring well is the diameter of the inner ring well plus 800mm to 1400mm.

[0010] A cover plate and a manhole are set on the top of the outer ring well, and the cover plate is shared with the inner ring well.

[0011] The elevation of the bottom of the outer ring well is 500mm above the top of the inner ring well outlet pipe. The bottom of the combined water inlet pipe should be higher than the top of the water hole and less than 4000mm; the elevation of the bottom of the inner ring well is 100mm below the bottom of the inner ring well outlet pipe.

[0012] An application method of a double-ring multifunctional inspection well at the end of an interception-type combined sewer system. In the dry season, the combined sewage enters the outer ring well, and the water flow impacts the wall of the inner ring well and falls to the bottom of the outer ring well. Part of the kinetic energy of the combined sewage water body is converted into potential energy, causing the liquid level to rise and forming a water jump; the water body then flows around the outer ring well, flows through the water holes on the wall of the inner ring well and falls into the inner ring well; the water body and the upstream sewage flowing into the inner ring water inlet pipe merge in the inner ring well, and are discharged together through the inner ring well outlet pipe to a downstream sewage treatment plant.

[0013] In the rainy season, at the beginning of rainfall, the combined sewage enters the outer ring well, then flows around the outer ring well, flows through the water holes on the wall of the inner ring well and falls into the inner ring well; the combined sewage and the upstream combined sewage flowing into the inner ring water inlet pipe merge in the inner ring well, and are discharged to the downstream sewage treatment plant through the inner ring well outlet pipe;

[0014] In the later stage of rainfall or during heavy rain, the water level in the inner ring well rises, the float valve closes, the combined sewage enters the outer ring well, and then flows around the outer ring well. The water level in the outer ring well rises, and when it rises to the elevation of the overflow outlet pipe, the combined sewage is discharged to the receiving water body through the overflow outlet pipe.

[0015] The double-ring multifunctional inspection well and application method used at the end of the interception-type combined sewer system transform the conventional four-way well into an inspection well integrating multiple functions, so as to achieve the purpose of saving land and rapid construction. The integrated inspection well is divided into two parts by setting the inner and outer rings, and takes into account 6 functions, including water inlet, overflow, energy dissipation, connection, interception and water outlet, so that the traditional interception well, drop well and three-way connection well are combined into one inspection well, thereby saving land, reducing investment, and providing a preferred solution for the construction unit.

[0016] The inspection well provided by the present invention also has a sludge settling function. Since the water hole is 100 mm higher than the bottom of the outer ring well, after the combined or sewage inlet pipe enters the outer ring well, impurities can be deposited at the bottom of the outer ring well, playing a sludge settling role and preventing particulate impurities from entering the inner ring well. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the embodiment 1 of the double-ring multifunctional inspection well for the end of the intercepting combined sewer system;

[0018] Figure 2 1 is a top view schematic diagram of the embodiment 1 of the double-ring multifunctional inspection well for the end of the intercepting combined sewer system;

[0019] Figure 3 yes Figure 2 A right side schematic diagram of

[0020] Figure 4 yes Figure 2 A front view schematic diagram of

[0021] Figure 5 It is a schematic diagram of an application of an embodiment of the present invention;

[0022] Figure 6 is a structural schematic diagram of the float valve;

[0023] Description of the accompanying drawings:

[0024] 1-combined water inlet pipe; 2-overflow water outlet pipe; 3-inner ring well water inlet pipe; 4-inner ring well water outlet pipe; 5-outer ring well wall; 6-inner ring well wall; 7-water hole; 8-outer ring well bottom elevation; 9-outer ring well; 10-inner ring well; 11-buoy valve; 12-valve plate; 13-buoy; 14-pendant; 15-upper slide rail; 16-lower slide rail; 17-upper block; 18-lower block; 19-first pulley; 20-second pulley; 21-third pulley; 22-traction rope; 23-pull rope. DETAILED DESCRIPTION

[0025] like Figure 1 and Figure 2 As shown, the double-ring multifunctional inspection well for the end of the interception-type combined sewer system includes an inner ring well 10 and an outer ring well 9 located in the inner and outer layers respectively, and the two are connected through a water hole 7. A float valve 11 is provided on the side of the water hole 7 close to the outer ring well 9, and the float valve 11 is used to prevent the water of the sewage main pipe of the inner ring well 10 from overflowing to the outer ring well 9. Furthermore, the bottom elevation of the outer ring well 9 is consistent with the bottom elevation of the inner ring well 10.

[0026] In one embodiment, the outer ring well 9 is a circular inspection well, which is a closed circular well formed by the outer ring well wall 5 and the inner ring well wall 6; the inner ring well 10 is a cylindrical inspection well, which is a closed cylindrical well formed by the inner ring well wall 6. In one embodiment, the diameter of the outer ring well 9 is the diameter of the inner ring well 10 plus 1000 mm.

[0027] The outer ring well 9 is provided with a combined water inlet pipe 1 and an overflow water outlet pipe 2. The combined water inlet pipe 1 is used to transport sewage or combined sewage to the outer ring well 9. The combined water inlet pipe 1 is arranged on one side of the outer ring well wall 5. The water inlet direction of the combined water inlet pipe 1 can be in any direction according to the needs of the project. The elevation and diameter of the combined water inlet pipe 1 are calculated and valued through the existing data of the project. An overflow water outlet pipe 2 is arranged on the opposite side of the combined water inlet pipe 1. The overflow water outlet pipe 2 is also arranged on the outer ring well wall 5. The diameter and elevation of the overflow water outlet pipe 2 are the same as those of the combined water inlet pipe 1.

[0028] The water outflow of the outer ring well 9 enters the inner ring well 10 through the water hole 7 on the inner side of the outer ring well 9. The water hole 7 is arranged on the inner ring well wall 6. The water hole 7 is located away from the combined water inlet pipe 1. The water inlet direction of the outer ring well is symmetrical with the direction of the water hole and the overflow pipe. In this embodiment 1, the water hole 7 is located on the opposite side of the combined water inlet pipe 1 and below the overflow outlet pipe 2. The size of the water hole 7 is calculated according to the interception multiple and the interception flow rate. The bottom elevation of the water hole 7 is 100mm higher than the bottom of the outer ring well 9.

[0029] During the use of the outer ring well 9, sewage or combined sewage passes through the outer ring well wall 5 and flows into the outer ring well 9 through the pipeline gravity flow. When just entering, the water flow has a relatively large flow rate, and after impacting the inner ring well wall 6, it falls to the bottom of the outer ring well. Part of the kinetic energy of the water body is converted into potential energy, causing the liquid level to rise significantly, forming a water jump, and then it flows around the outer ring well 9 for half a circle, adjusting the water flow state, and flows through the water holes 7 on the inner ring well wall 6 into the inner ring well 10, realizing the waterfall energy dissipation effect.

[0030] The inner ring well 10 is provided with an inner ring well inlet pipe 3 and an inner ring well outlet pipe 4 which serve as sewage main pipes. The upstream sewage flowing into the inner ring well inlet pipe 3 is discharged to the downstream through the inner ring well outlet pipe 4. The diameter of the inner ring well 10 is determined according to the diameter of the inner ring well outlet pipe 4, and the bottom elevation of the inner ring well 10 is determined according to the bottom elevation of the inner ring well outlet pipe 4 minus 100 mm.

[0031] The diameter and elevation of the inner ring well water inlet pipe 3 and the diameter and elevation of the inner ring well water outlet pipe 4 are determined according to the actual needs of the project and the elevation of the upstream and downstream water. The inner ring well water inlet pipe 3 is not limited to the direction of the water inlet, and can be arranged symmetrically with the inner ring well water outlet pipe 4, or can be arranged at an obtuse angle. In a certain embodiment, the outer side of the water hole 7 receives the combined sewage of the outer ring well 9, and the combined sewage enters the inner ring well 10 through the water hole 7, and merges with the upstream sewage flowing into the inner ring well water inlet pipe 3 in the inner ring well, and then is discharged to the urban sewage treatment plant through the inner ring well water outlet pipe 4.

[0032] A float valve 11 is arranged on the outside of the water hole 7. The size of the float valve 11 is the same as that of the water hole 7. The float valve 11 mainly functions in the rainy season. In the dry season, the float valve 11 is fully open, and the domestic sewage generated by residents enters the inner ring well 10 from the outer ring well 9, and is then discharged to the downstream sewage treatment plant. At the beginning of rainfall, the runoff rainwater generated on the ground carries pollutants such as dust and soil. At this time, the pollution degree of combined sewage is high and the rainfall is small. The water levels of the inner ring well 10, the inner ring well inlet pipe 3, and the inner ring well outlet pipe 4 are all low. At this time, the float valve is also in a fully open state. When it comes to the later stage of rainfall, the ground is relatively clean after being washed by rainwater, and the pollution degree of combined sewage is low. At this time, the rainfall increases, and the water level of the outer ring well 9 rises until it reaches the conditional water level for the closure of the float valve 11. At this time, the water hole 7 is closed, and the relatively clean combined sewage stagnates in the outer ring well 9. The water level of the outer ring well 9 rises, and the overflow outlet pipe 2 plays a role, discharging the relatively clean combined sewage through the overflow outlet pipe 2 to a receiving water body with a certain water environment capacity, thereby avoiding causing the outer ring well to be full of water and then ground flooding.

[0033] Combination Figure 3 and Figure 4 As shown, the bottom of the inner ring well water inlet pipe 3 and the inner ring well water outlet pipe 4 are higher than the bottom of the inner ring well 10, the top of the inner ring well water inlet pipe 3 and the inner ring well water outlet pipe 4 are lower than the bottom of the outer ring well 9, the bottom of the water hole 7 is higher than the bottom of the outer ring well 9, the top of the water hole 7 is lower than the bottom of the combined water inlet pipe 1 and the overflow water outlet pipe 2, and the combined water inlet pipe 1 and the overflow water outlet pipe 2 are at the same height. The outer ring well bottom elevation 8 is above the top of the inner ring well water outlet pipe, and the inner ring well bottom elevation is below the bottom of the inner ring well water outlet pipe.

[0034] The double-ring multifunctional inspection well used at the end of the interception-type combined sewer system is divided into two parts by setting an inner ring well and an outer ring well, and has the following functions:

[0035] (1) The combined water inlet pipe first enters the outer ring well 9 according to the direction of the incoming water. After colliding and rubbing with the inner ring well wall 6, part of the kinetic energy is eliminated to realize the energy dissipation function, and then falls into the bottom of the outer ring well 9 to complete the water intake function. Then, it flows through the circular channel of the outer ring well 9 to the end water hole 7, thereby eliminating the energy carried by the water body when entering the outer ring well 9 from the combined water pipe.

[0036] (2) An overflow outlet pipe 2 having the same diameter and elevation as the combined inlet pipe 1 is arranged in the outer ring well 9 to realize the overflow function of the multifunctional inspection well during rainfall.

[0037] (3) During the dry season, sewage flows through the water hole 7 and falls into the inner well ring 10. The inner well ring 10 is connected to the inlet and outlet pipes of the drainage main, completing the connection and water outlet functions of the inspection well.

[0038] (4) During the rainy season, the combined sewage is restricted from entering the inner ring well 10 by the action of the float valve 11, thereby achieving the interception function.

[0039] The following examples are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the following description, and these obvious changes or modifications derived from the spirit of the present invention are still within the scope of protection of the present invention.

[0040] refer to Figures 1 to 4 As shown, the double-ring multifunctional inspection well for the end of the intercepting combined sewer system provided by the present invention has an overall structure in which the multifunctional inspection well is divided into an inner ring well and an outer ring well by setting two outer walls. Through clever arrangement and the water retaining weirs, water holes, float valves, etc. set in the area, the multifunctional inspection well has a total of six functions including water intake, overflow, energy dissipation, connection, interception and sludge sedimentation.

[0041] Two well walls are set up to create different functional areas: the outer ring well is a circular inspection well, and the inner ring well is a cylindrical inspection well. The outer ring well has three functions of water inlet, overflow and energy dissipation. The diameter of the outer ring well is 1000mm. The aperture of the water hole is calculated according to the interception rate. The bottom of the water hole is 100mm higher than the bottom of the outer ring well, acting as a dissipation sill. A cover plate and a manhole are set on the top of the outer ring well, and the cover plate is shared with the inner ring well.

[0042] The bottom elevation of the outer ring well is 500mm above the top of the outlet pipe. The bottom of the combined inlet pipe should be higher than the top of the water hole and less than 4000mm. The combined inlet pipe elevation is determined according to the water elevation. An overflow outlet pipe with the same diameter and elevation is set on the opposite side of the combined inlet pipe. The inner ring well has three functions: connection, interception and water discharge. The diameter of the inner ring well should match the corresponding well diameter according to the diameter of the inner ring well outlet pipe. After the combined water falls into the inner ring well through the water hole, it is transferred to the downstream sewage treatment plant through the outlet pipe. The bottom elevation of the inner ring well is 100mm below the bottom of the outlet pipe. A manhole is set at the top of the inner ring well. The inlet and outlet pipes of the inner ring well can be located in any direction and adjusted according to actual conditions. The inlet and outlet pipes of the inner ring well are flat. A float valve with a corresponding aperture is set on the outside of the water hole of the inner ring well to control the water level, so as to achieve the purpose of controlling the interception volume.

[0043] Operation of the outer ring well: Sewage or combined sewage flows into the outer ring inspection well through the gravity flow of the pipeline. When it first enters, the water flow has a large flow rate. After impacting the inner ring well wall, it falls to the bottom of the outer ring well. Part of the kinetic energy of the water body is converted into potential energy, causing the liquid level to rise significantly, forming a water jump. Then it flows around the well for half a circle, adjusts the water flow state, and flows through the water hole 50mm higher than the bottom of the outer ring well into the inner ring well, acting as a dissipation sill.

[0044] Operation of the inner ring well: At the beginning of rainfall, the combined sewage with a higher degree of pollution falls into the inner ring well through the water hole. At this time, the float valve is open, and the combined sewage is discharged to the downstream sewage treatment plant through the inner ring well outlet pipe of the inner ring well. However, as the rainfall duration increases, the water level in the pipe network continues to rise, and the water level of the outer ring well also increases. At this time, the float valve plays a flow limiting role, preventing the combined sewage of the outer ring well from entering the inner ring well, so that the overflow outlet pipe of the outer ring well is discharged to the outside to avoid ground flooding.

[0045] The application method of the double-ring multifunctional inspection well at the end of the interception type combined sewer system includes two specific working steps, namely, dry season and rainy season, as described below:

[0046] In the dry season: sewage enters the outer ring well. When it first enters, the water flow has a large flow rate. After impacting the wall of the inner ring well, it falls to the bottom of the outer ring well. Part of the kinetic energy of the water body is converted into potential energy, causing the liquid level to rise significantly, forming a water jump. Then it flows around the outer ring well for half a circle, adjusts the water flow state, flows through the water holes on the wall of the inner ring well and falls into the inner ring well. It merges with the upstream sewage flowing into the inner ring water inlet pipe in the inner ring well and is discharged to the downstream sewage treatment plant through the inner ring well outlet pipe.

[0047] During the rainy season: At the beginning of rainfall, the combined sewage enters the outer ring well, then flows around the outer ring well for half a circle, adjusts the water flow pattern, flows through the water holes on the wall of the inner ring well and falls into the inner ring well. It merges with the upstream combined sewage flowing into the inner ring inlet pipe in the inner ring well, and is discharged to the downstream sewage treatment plant through the inner ring well outlet pipe. In the late rainfall or heavy rain, the water level of the outer ring well rises, the float valve is closed, and the combined sewage enters the outer ring well, then flows around the outer ring well for a circle. The water level of the outer ring well rises. When it rises to the elevation of the overflow outlet pipe, the combined sewage is discharged to the receiving water body through the overflow outlet pipe.

[0048] It can be seen that the multifunctional inspection well is equipped with two well walls, which divide the multifunctional inspection well into two parts. The outer ring well is the water inlet area, overflow area and energy dissipation area, and the inner ring well is the connection area, interception area and water outlet area. The combined inlet pipe first enters the outer ring inspection well according to the direction of the incoming water, collides and rubs with the inner wall of the inspection well, eliminates part of the kinetic energy, falls into the bottom of the outer ring well, and then flows through the outer ring well channel for a circle to the end water hole, thereby eliminating the energy carried by the water body entering the inspection well from the combined pipe. At the same time, an overflow outlet pipe with the same diameter and elevation as the combined inlet pipe is set in the outer ring well to realize the overflow function of the inspection well during rainfall. After passing through the water hole, the combined inlet flow falls into the inner ring of the inspection well. The inner ring is connected to the inlet and outlet pipes of the drainage main pipe to complete the connection and water outlet functions of the inspection well. In summary, the inspection well integrating multiple functions can effectively prevent flooding, save land, and reduce investment.

[0049] refer to Figure 5As shown, the double-ring multifunctional inspection well for the end of the intercepting combined sewer system provided by the present invention can be set in a position in the intercepting combined sewer system, and can be used in the scenario where a single combined sewer pipe is connected to the drainage network, and can also be used to connect the combined pipe of the entire intercepting combined sewer area to the drainage main of the intercepting combined sewer system.

[0050] like Figure 6 As shown, the structure of the float valve 11 includes a slide rail, a valve plate 12, a float 13 and a pendant 14. Slide rails are provided on the upper and lower sides of the water hole 7. The valve plate 12 can move along the slide rails to block the water outlet 7. One end of the valve plate 12 is connected to the pendant 14 through a pull rope 23, and the other end is connected to the float 13 through a traction rope 22.

[0051] The slide rails include an upper slide rail 15 and a lower slide rail 16. The upper slide rail 15 is installed above the water hole 7, and the lower slide rail 16 is installed below. The upper side of the valve plate 12 is fixedly connected to the upper slider of the upper slide rail 15, and the lower side is fixedly connected to the lower slider of the lower rail 16. Through the two sliders, the valve plate 12 can move along the slide rails, and when it moves to the water hole 7, it can block the water hole 7.

[0052] The valve plate 12 is far away from the left side of the water hole 7 and is connected to the pendant 14 through a pull rope 23. The pendant 14 is a heavy object that can drive the valve plate 12 away from the water hole 7 so as not to block the water hole 7. On the side close to the pendant 14, that is, on the left side of the water hole 7, the upper slide rail 15 is provided with an upper block 17, and the lower slide rail 16 is provided with a lower block 18. The upper block 17 and the lower block 18 can limit the leftward movement range of the valve plate 12. Further, the pull rope 23 bypasses the first pulley 19, and the first pulley 19 is installed on the lower slide rail 16 through the first support rod.

[0053] The valve plate 12 is close to the right side of the water hole 7 and is connected to the buoy 13 through a traction rope 22. The right side of the water hole 7 is provided with a second pulley 20 and a third pulley 21 that limit the traction rope 22. The second pulley 20 and the third pulley 21 are arranged up and down, and the traction rope 22 passes between the second pulley 20 and the third pulley 21. The second pulley 20 is installed on the upper slide rail 15 through a second support rod, and the third pulley 21 is installed on the lower slide rail 16 through a third support rod. The second pulley 20 and the third pulley 21 limit the distance that the valve plate 12 moves to the right.

[0054] When the water level of the outer ring well 9 is not high, the pendant 14 is heavier than the buoy 13, and the pendant 14 pulls the valve plate 12 to move to the left, and the buoy 13 also moves to the left until the valve plate 12 is blocked by the upper block 17 and the lower block 18. When the water level of the outer ring well 9 rises, in this process, the buoy 13 is affected by the buoyancy and pulls the valve plate 12 to move to the right, thereby slowly covering the water hole 7. By adjusting the height of the second pulley 20 and the third pulley 21, as well as the length of the traction rope 22, the height at which the buoy starts to rise can be adjusted according to the water levels at different heights.

[0055] The present invention combines the traditional interception well, waterfall well, and three-way connection well into one inspection well, thereby saving space and reducing investment. The energy dissipation effect of the waterfall can prevent the influent flow rate from being too high and directly entering the existing well, causing scouring of the downstream pipeline, and avoid the air entrainment caused by sewage directly falling into the existing well during the dry season. The interception function can limit the relatively clean combined sewage in the rainy season to flow in the outer ring well, avoiding the greater pressure caused by entering the inner ring well water supply and drainage network operation.

Claims

1. A double-ring multifunctional inspection well for the end of a interception-type combined sewer system, characterized in that: It includes an inner ring well and an outer ring well which are arranged in inner and outer layers respectively, the inner ring well is formed by the inner ring well wall, and the outer ring well is formed by the outer ring well wall and the inner ring well wall; the inner ring well wall is provided with a water hole connecting the outer ring well and the inner ring well, the inner ring well is provided with an inner ring well water inlet pipe and an inner ring well water outlet pipe, the outer ring well is provided with a relatively arranged combined water inlet pipe and an overflow water outlet pipe, the water hole is located away from the combined water inlet pipe, and a float valve is provided on the side of the water hole facing the outer ring well.

2. The double-ring multifunctional inspection well for the end of the intercepting combined sewer system according to claim 1 is characterized in that: The water hole is located at the opposite side of the combined water inlet pipe and is lower than the overflow water outlet pipe.

3. The double-ring multifunctional inspection well for the end of the intercepting combined sewer system according to claim 1 is characterized in that: The water hole is located below the overflow outlet pipe, and the bottom elevation is 70mm to 120mm higher than the bottom of the outer ring well and meets the equipment installation requirements.

4. The double-ring multifunctional inspection well for the end of the intercepting combined sewer system according to claim 1 is characterized in that: The diameter of the inner ring well is determined according to the diameter of the inner ring well outlet pipe, and the bottom elevation of the inner ring well is determined according to the bottom elevation of the inner ring well outlet pipe minus 70mm to 120mm.

5. The double-ring multifunctional inspection well for the end of the intercepting combined sewer system according to claim 1 is characterized in that: The water inlet direction of the outer ring well is arranged symmetrically with the direction of the water hole and the overflow pipe.

6. The double-ring multifunctional inspection well for the end of the intercepting combined sewer system according to claim 1 is characterized in that: The outer ring well is a circular inspection well, which is a closed circular well formed by the outer ring well wall and the inner ring well wall; the inner ring well is a cylindrical inspection well, which is a closed cylindrical well formed by the inner ring well wall; the bottom elevation of the outer ring well is consistent with the bottom elevation of the inner ring well, and the diameter of the outer ring well is the diameter of the inner ring well plus 800mm to 1400mm.

7. The double-ring multifunctional inspection well for the end of the intercepting combined sewer system according to claim 1 is characterized in that: A cover plate and a manhole are set on the top of the outer ring well, and the cover plate is shared with the inner ring well.

8. The double-ring multifunctional inspection well for the end of the intercepting combined sewer system according to claim 1 is characterized in that: The elevation of the bottom of the outer ring well is 500mm above the top of the inner ring well outlet pipe. The bottom of the combined water inlet pipe should be higher than the top of the water hole and less than 4000mm; the elevation of the bottom of the inner ring well is 100mm below the bottom of the inner ring well outlet pipe.

9. An application method of a double-ring multifunctional inspection well at the end of a cut-off combined sewer system, characterized in that: During the dry season, the combined sewage enters the outer ring well, and the water flow hits the wall of the inner ring well and falls to the bottom of the outer ring well. Part of the kinetic energy of the combined sewage water body is converted into potential energy, causing the liquid level to rise and forming a water jump; the water body then flows around the outer ring well, flows through the water holes on the wall of the inner ring well and falls into the inner ring well; the water body and the upstream sewage flowing into the inner ring inlet pipe merge in the inner ring well, and are discharged to the downstream sewage treatment plant through the inner ring well outlet pipe.

10. The application method of the double-ring multifunctional inspection well at the end of the intercepting combined sewer system according to claim 9 is characterized in that: In the rainy season, at the beginning of rainfall, the combined sewage enters the outer ring well, then flows around the outer ring well, flows through the water holes on the wall of the inner ring well and falls into the inner ring well; the combined sewage and the upstream combined sewage flowing into the inner ring water inlet pipe merge in the inner ring well, and are discharged to the downstream sewage treatment plant through the inner ring well outlet pipe; In the later stage of rainfall or during heavy rain, the water level in the inner ring well rises, the float valve closes, the combined sewage enters the outer ring well, and then flows around the outer ring well. The water level in the outer ring well rises, and when it rises to the elevation of the overflow outlet pipe, the combined sewage is discharged to the receiving water body through the overflow outlet pipe.

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