A sediment setting device for a drainage inspection well

Abstract

This invention belongs to the field of inspection well technology, and particularly relates to a sedimentation device for drainage inspection wells. The device includes a housing fixed to the inspection well, with U-shaped recesses on both sides and a stop block at the bottom. A flow channel is provided inside the housing, forming a sealed cavity with the housing. Air holes are provided on the flow channel, and an air pipe is fixed inside each hole, connected to an air pump. A pressure sensor is installed inside the air pipe. The device also includes a trapping basket conforming to the shape of the flow channel, with a guide rod on it. The pressure sensor is wirelessly connected to a controller. This invention allows the inspection well to continue to be used as a normal inspection well, providing multi-functionality; it can monitor the amount of waste deposited, enabling timely cleaning of the deposits to prevent explosions; and it allows for convenient manual cleaning via the trapping basket, avoiding the danger of workers entering the well for cleaning.

Description

Technical Field

[0001] This invention belongs to the field of inspection well technology, and particularly relates to a sedimentation device for drainage inspection wells. Background Technology

[0002] According to the "Outdoor Drainage Design Standard" (GB50014-2021), sewage pipelines are generally not designed with sedimentation tanks. However, after the sewage pipelines are in operation, a large amount of silt will accumulate inside. If not cleaned in time, it will affect the flow capacity of the pipeline. To address this problem, sedimentation wells are generally installed, with sedimentation tanks inside. These tanks are used to intercept and deposit larger debris in the pipeline, serving as a centralized cleaning point for solid silt and preventing pipeline blockage. However, the overflow drainage from the inspection well with sedimentation tanks can reduce the flow velocity in the downstream pipe section. In addition, the long-term accumulation of large amounts of organic matter in the sedimentation tanks can affect the BOD index of the downstream sewage treatment plant, and anaerobic fermentation can easily occur at the bottom of the well, forming flammable and explosive gases, increasing the risk of pipeline operation problems. Summary of the Invention

[0003] The problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a sludge settling device for drainage inspection wells.

[0004] This invention is achieved through the following technical solution: A sedimentation device for a drainage inspection well includes a box body whose overall shape conforms to the shape of the inspection well. The box body is placed at the bottom of the inspection well and fixed to the inspection well with bolts. The box body is open at the top and closed at the bottom. U-shaped recesses matching the curvature of the pipe inlet and outlet of the inspection well are respectively provided on the upper two sides of the box body. Several horizontal blocks are provided on the lower side wall of the box body. A flow channel is provided inside the box body, forming a sealed cavity downwards with the box body. The flow channel can slide up and down along the box body. The middle of the flow channel is a U-shaped groove. Horizontal plates A extend outwards from the upper ends of both sides of the U-shaped groove. A vertical air pipe is fixed on any horizontal plate A, passing downwards through the horizontal plate A. The pipe has a cap at the top and a shut-off valve on the air pipe. A pressure sensor is installed inside the air pipe. Four guide rods are symmetrically fixed upwards on the upper surface of the horizontal plates A on both sides. It also includes a sludge trap basket that matches the shape of the flow channel. The sludge trap basket is placed on the flow channel. The sludge trap basket has a U-shaped mesh in the middle. The two upper ends of the U-shaped mesh extend outwards to horizontal plates B. The two horizontal plates B have round holes corresponding to the guide rods. The guide rods pass upwards through the round holes. The upper end of the guide rods is lower than the manhole cover of the inspection well. Each side of the horizontal plate B has a notch corresponding to the air pipe. The air pipe passes upwards through the notch. Four lifting ropes are symmetrically fixed on the sludge trap basket. The upper ends of the lifting ropes are tied to the upper ends of the guide rods. The pressure sensor is wirelessly connected to the controller.

[0005] Preferably, the sidewall of the U-shaped trough is equipped with a level gauge, which is wirelessly connected to the controller.

[0006] Preferably, a sealing ring is provided around the edge of the flow channel.

[0007] Preferably, the box is a plastic box.

[0008] Preferably, the upper end of the guide rod is 5-15cm lower than the lower surface of the manhole cover.

[0009] Preferably, there are four blocks, evenly distributed around the inner wall of the box.

[0010] Preferably, the box is cylindrical or cuboid.

[0011] Preferably, the U-shaped groove mesh has a square grid with a side length of 4-5 cm.

[0012] Preferably, the upper part of the trachea is provided with a limiting ring, which is fixed to the well wall of the inspection well and can pass through the notch.

[0013] Beneficial effects of this invention: I. The sedimentation device of this invention is placed inside the inspection well, so that the inspection well can be used as a normal inspection well as a sedimentation well, making the inspection well multifunctional. Second, the sedimentation device of the present invention can monitor the amount of sediment deposited. When the amount of sediment deposited is too much, it can be cleaned in time to avoid the occurrence of anaerobic fermentation of sediment and the formation of flammable and explosive gases. Third, the present invention can facilitate manual cleaning through the intercepting basket, avoiding the danger of workers going down the well to clean; Fourth, this invention monitors the amount of sediment deposition from two aspects: pressure sensor and level gauge. It has dual indicator prompts, which can promptly clean up the sediment and play a smart early warning role in operation and maintenance. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the usage state structure in this embodiment; Figure 2 This is a top view of the structure in use according to this embodiment; Figure 3 This is a schematic diagram of the structure after the box and flow channel are combined in this embodiment; Figure 4 This is an enlarged structural diagram of the trachea in this embodiment; Figure 5 This is a schematic diagram of the combined box and flow channel structure from another angle in this embodiment; Figure 6 This is a schematic diagram of the box structure in this embodiment; Figure 7 This is a schematic diagram of the side structure of the box in this embodiment. Figure 8 This is a schematic diagram of the trap structure in this embodiment; Figure 9 This is a schematic diagram of the flow channel structure in this embodiment.

[0015] In the diagram, 1 is the inspection well, 2 is the housing, 3 is the pipe inlet, 4 is the pipe outlet, 5 is the U-shaped notch, 6 is the stop block, 7 is the flow channel, 8 is the U-shaped groove, 9 is the horizontal plate A, 10 is the round hole, 11 is the air pipe, 12 is the plug, 13 is the stop valve, 14 is the intercepting basket, 15 is the U-shaped mesh, 16 is the horizontal plate B, 17 is the guide rod, 18 is the notch, 19 is the level gauge, 20 is the lifting rope, and 21 is the limit ring. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of the present invention, but not all embodiments.

[0017] This embodiment includes a housing 2, preferably a plastic housing with a smooth inner wall. The shape and size of the housing 2 match the shape and size of the inspection well 1. The housing 2 is placed inside the inspection well 1 at the bottom of the well and is fixed to the well wall of the inspection well 1 with bolts to prevent it from moving inside the well. If the inspection well 1 is cylindrical, the overall shape of the housing 2 is also cylindrical, with the outer diameter of the housing 2 equal to or slightly smaller than the inner diameter of the inspection well 1. If the inspection well 1 is cuboid, the shape of the housing 2 is also cuboid, with the length and width of the housing 2 equal to or slightly smaller than the internal length and width of the inspection well 1. To facilitate placement of the housing 2, it is preferable that the external dimensions of the housing 2 are slightly smaller than the internal dimensions of the inspection well 1. The housing 2 is open at the top and closed at the bottom. U-shaped recesses 5 are provided on both sides of the upper part of the housing 2, and the curvature of the U-shaped recesses 5 on both sides matches the curvature of the pipe inlet 3 and the pipe outlet 4 of the inspection well 1, respectively. Several horizontal blocks 6 are provided on the lower side wall inside the housing 2. The blocks 6 can be integrally formed on the inner wall of the housing 2. The blocks 6 are used to limit the lowest position of the flow channel 7 and to support the flow channel 7, preventing the bottom of the flow channel 7 from being damaged due to excessive pressure. Preferably, there are four blocks 6, which are evenly distributed around the inner wall of the housing 2.

[0018] A flow channel 7 is provided inside the housing 2. The flow channel 7 is placed inside the housing 2, and its edge is in close contact with the inner wall of the housing 2. The flow channel 7 forms a sealed cavity with the housing 2 downwards. The flow channel 7 can slide up and down along the inner wall of the housing 2. The up and down sliding of the flow channel 7 is controlled by the filling and venting of air in the cavity. To further ensure the sealing of the cavity formed by the flow channel 7 and the housing 2, a sealing ring is preferably provided around the edge of the flow channel 7. The middle of the flow channel 7 is a U-shaped groove 8, and the curvature of the U-shaped groove 8 matches the curvature of the pipe inlet 3 and the pipe outlet 4, respectively. The two upper ends of the U-shaped groove 8 extend outwards as horizontal plates A9. The flow channel 7 is also preferably made of plastic. A vertical air pipe 11 is fixed on the edge of any horizontal plate A9. The air pipe 11 passes downwards through the horizontal plate A9. The lower part of the air pipe 11 is located in the cavity formed by the flow channel 7 and the housing 2. A plug 12 is provided at the upper end of the air pipe 11 to block the air pipe 11. A shut-off valve 13 is provided at the upper part of the air pipe 11, which is used to control the air intake and exhaust of the air pipe 11. A pressure sensor is provided inside the air pipe 11 to detect the air pressure inside the air pipe 11, that is, the air pressure in the cavity enclosed by the flow channel 7 and the box 2. The pressure sensor is wirelessly connected to the controller and transmits the air pressure value in the cavity to the controller. To further stabilize the air pipe 11 in the inspection well 1, preferably, a limiting ring 21 is provided at the upper part of the air pipe 11. The air pipe 11 passes through the limiting ring 21. The limiting ring 21 has the function of limiting and stabilizing the air pipe 11, keeping the air pipe 11 in a vertical state. The limiting ring 21 is fixed to the well wall of the inspection well 1. Four guide rods 17 are symmetrically fixed upward on the upper surface of the horizontal plate A9 on both sides of the flow channel 7. In this embodiment, the four guide rods 17 are distributed at the four corners of the flow channel 7. The upper end of the guide rod 17 is lower than the manhole cover of the inspection well 1. The guide rod 17 has the function of guiding and limiting when the intercepting basket 14 is lifted upward. Preferably, the upper end of the guide rod 17 is 5-15cm lower than the lower surface of the manhole cover of the inspection well 1.

[0019] The invention also includes a sludge-collecting basket 14 that conforms to the shape of the flow channel 7. The sludge-collecting basket 14 is placed on the flow channel 7. The sludge-collecting basket 14 has a U-shaped mesh 15 in the middle. The mesh of the U-shaped mesh 15 is preferably square, with a mesh side length of 4-5 cm. The two upper ends of the U-shaped mesh 15 extend outward as a horizontal plate B16. The horizontal plates B16 on both sides are provided with round holes 10 corresponding to the guide rods 17. The guide rods 17 pass upward through the round holes 10. The sludge-collecting basket 14 is fitted onto the guide rods 17 through the round holes 10 and can slide up and down along the guide rods 17. A notch 18 is provided on the edge of the horizontal plate B16 corresponding to the position of the air pipe 11. Both the air pipe 11 and the limiting ring 21 can pass through the notch 18. When a large amount of silt accumulates on the intercepting basket 14, the basket 14 and the flow channel 7 will sink due to downward pressure. Therefore, to further facilitate the determination of the amount of silt deposited, a level gauge 19 is preferably installed on the upper side wall of the U-shaped channel mesh 15. The level gauge 19 is wirelessly connected to the controller, and transmits the liquid level signal in the inspection well to the controller. The operator can determine the amount of silt deposited based on the liquid level information. Four lifting ropes 20 are symmetrically fixed on the intercepting basket 14. The upper end of the lifting ropes 20 is tied to the upper end of the guide rod 17. The intercepting basket 14 can be lifted upward to the wellhead or outside the well by using the lifting ropes 20.

[0020] When using this invention, first place the box 2 at the bottom of the inspection well 1, align the U-shaped notches 5 on both sides of the box 2 with the pipe inlet 3 and pipe outlet 4 of the inspection well 1 respectively. The lowest point of the U-shaped notches 5 of the box 2 is slightly lower than the lowest point of the pipe inlet 3 and pipe outlet 4. Then, fix the box 2 in the inspection well 1 with bolts. The gap between the box 2 and the well wall of the inspection well 1 is filled with cement mortar. Pass the four guide rods 17 of the flow channel 7 through the round holes 10 of the intercepting basket 14. At this time, the air pipe 11 is just inside the notch 18 of the intercepting basket 14. Then, put the limiting ring 21 on the air pipe 11. The inner diameter of the limiting ring 21 is slightly larger than the outer diameter of the air pipe 11. The limiting ring 21 does not contact the outer surface of the air pipe 11. The limiting ring 21 is fixed to the well wall of the inspection well 1 by the support rod. At this time, the intercepting basket 14 is placed on the flow channel 7. Tie the upper ends of the lifting ropes 20 at the four corners of the intercepting basket 14 to the upper ends of the guide rods 17. Then, place the flow channel 7 and the intercepting basket 14 in the box 2 and turn on the air. The upper end of pipe 11 is plugged with cap 12. An external air pump is connected to inflate the air pipe 11, thereby inflating the housing 2. The air pressure inside the cavity is designed to be level with or slightly lower than the pipe inlet 3 or pipe outlet 4 under minimum water flow conditions. It can also be set according to other conditions. Alternatively, the sewage basket 14 can be slightly lower than the pipe inlet 3 or pipe outlet 4 under minimum water flow conditions, about 5-10cm lower is preferred. After inflation, the flow channel 7 and the sewage basket 14 stay in one position. Close the shut-off valve 13 and cover with cap 12. During operation, water flows through the inspection well 1. As time goes by, more and more silt accumulates on the intercepting basket 14, and the intercepting basket 14 and the flow channel 7 are pressed down. The intercepting basket 14 and the flow channel 7 slide down along the box 2, and the air inside the box 2 is compressed, increasing the air pressure. When the air pressure increases to a certain value, the staff can determine whether to arrange for personnel to clean the silt by receiving the pressure sensor value. At the same time, the liquid level gauge 19 value can also be used to help determine the amount of silt deposited. During dredging, sandbags are used to block the downstream pipe opening. The plug 12 and shut-off valve 13 on the air pipe 11 are opened to release the gas in the box 2 outward through the air pipe 11. When the gas is released, the flow channel 7 slides down, so that the flow channel 7 reaches the lowest position and the bottom of the flow channel 7 falls on the stop block 6. The upstream pipe section of the inspection well 1 is cleaned with a cleaning water gun. At the same time, a vacuum truck is used to suck away the cleaning sewage and sludge from the sunken intercepting basket 14. Large particles of silt that cannot be sucked out eventually settle in the intercepting basket 14. At this time, the upper end of the lifting rope 20 on the guide rod 17 is untied, and the intercepting basket 14 is lifted upward through the lifting rope 20. During the lifting process, the intercepting basket 14 slides upward along the guide rod 17. The notch 18 prevents the intercepting basket 14 from being blocked by the air pipe 11 and the limiting ring 21. The intercepting basket 14 is lifted to the well opening or directly lifted out of the well opening, and then cleaned manually. The installation of the intercepting basket 14 facilitates manual cleaning and also avoids the dangers of personnel going down into the well to operate.After the dredging is completed, the intercepting basket 14 is placed back on the flow channel 7 via the guide rod 17, and the upper end of the lifting rope 20 is tied to the upper end of the guide rod 17 again. The sandbags upstream and downstream of the dredging pipe section are removed, and then air is injected into the cavity of the box 2 again through the air pipe 11 to increase the air pressure in the cavity. The above inflation process is repeated to allow the flow channel 7 to slide upward back to the initial set position. The plug 12 is then covered, the shut-off valve 13 is closed, and the pipeline returns to normal operation.

[0021] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; those skilled in the art should understand that modifications can still be made to the technical solutions described in the above embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A sedimentation device for drainage inspection wells, characterized in that: The box (2) is designed to fit the shape of the inspection well (1). The box (2) is placed at the bottom of the inspection well (1) and fixed to the inspection well (1) with bolts. The box (2) is open at the top and closed at the bottom. The upper sides of the box (2) are provided with U-shaped notches (5) that match the arc of the pipe inlet (3) and pipe outlet (4) of the inspection well (1). Several horizontal blocks (6) are provided on the lower side wall inside the box (2). A flow channel (7) is provided inside the box (2). The flow channel (7) forms a closed cavity with the box (2) downward. The flow channel (7) can slide up and down along the box (2). The middle of the flow channel (7) is a U-shaped groove (8). The upper ends of the two sides of the U-shaped groove (8) extend outward to form horizontal plates A (9). An air pipe (11) is fixed on any horizontal plate A (9). The air pipe (11) passes downward through the horizontal plate A (9). The upper end of the air pipe (11) is provided with a plug (12), the air pipe (11) is provided with a shut-off valve (13), the air pipe (11) is provided with a pressure sensor, and four guide rods (17) are symmetrically fixed upward on the upper surface of the horizontal plates A (9) on both sides; it also includes a sludge trap (14) that matches the shape of the flow channel (7), the sludge trap (14) is placed on the flow channel (7), the sludge trap (14) has a U-shaped mesh (15) in the middle, and the two upper ends of the U-shaped mesh (15) extend outward to the horizontal plates B (16), the two horizontal plates B (16) The guide rod (17) is provided with a circular hole (10) corresponding to the guide rod (17). The guide rod (17) passes through the circular hole (10) upward. The upper end of the guide rod (17) is lower than the manhole cover of the inspection well (1). Any horizontal plate B (16) has a notch (18) corresponding to the air pipe (11) on its side. The air pipe (11) passes through the notch (18) upward. Four lifting ropes (20) are symmetrically fixed on the sludge basket (14). The upper end of the lifting rope (20) is tied to the upper end of the guide rod (17). The pressure sensor is wirelessly connected to the controller.

2. The sludge settling device for drainage inspection wells according to claim 1, characterized in that: The side wall of the U-shaped trough (15) is equipped with a level gauge (19), which is wirelessly connected to the controller.

3. The sludge settling device for drainage inspection wells according to claim 1 or 2, characterized in that: A sealing ring is provided around the edge of the flow channel (7).

4. The sludge settling device for drainage inspection wells according to claim 1 or 2, characterized in that: The box (2) is a plastic box.

5. The sludge settling device for drainage inspection wells according to claim 1 or 2, characterized in that: The upper end of the guide rod (17) is 5-15cm lower than the lower surface of the manhole cover (1).

6. The sludge settling device for drainage inspection wells according to claim 1 or 2, characterized in that: The baffle (6) consists of four pieces, which are evenly distributed around the inner wall of the box (2).

7. The sludge settling device for drainage inspection wells according to claim 1 or 2, characterized in that: The box (2) is cylindrical or rectangular.

8. The sludge settling device for drainage inspection wells according to claim 1 or 2, characterized in that: The U-shaped groove mesh (15) has square grids with a side length of 4-5cm.

9. The sludge settling device for drainage inspection wells according to claim 1 or 2, characterized in that: The upper part of the air pipe (11) is provided with a limiting ring (21), which is fixed on the well wall of the inspection well (1). The limiting ring (21) can pass through the gap (18).

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