Micro-pipeline corridor drainage anti-blocking device and anti-blocking method thereof

Abstract

The present application relates to the field of pipe gallery pipeline anti-blocking, and discloses a micro pipe gallery drainage anti-blocking device and anti-blocking method, which comprises a water guide pipe, one end of the water guide pipe is fixedly connected with a sleeve, the bottom end of the sleeve is fixedly connected with a water guide box, the bottom surface of the water guide box is connected with a drain pipe, a crushing assembly is arranged between the drain pipe and the water guide box, the multiple connecting rods in the crushing assembly are scattered in the water guide box in the initial state, so that the connecting rods can conveniently receive sundries in the water guide box, when cleaning is needed, multiple hooks are turned over under the action of a traction assembly, so that the hooks clamp the branches and sundries received by the multiple connecting rods, the traction assembly cooperates with the crushing assembly, so that the sundries in the water guide box are pulled down to the drain pipe, and the sundries are further prevented from being blocked in the water guide box, and the multiple connecting rods and multiple fixed rods are arranged to cross in the drain pipe, so that the pulled-down sundries are crushed.

Description

Technical Field

[0001] This invention relates to the field of pipe gallery anti-clogging, and in particular to a micro pipe gallery drainage anti-clogging device and method. Background Technology

[0002] A utility tunnel is typically an underground or horizontal structure used to house pipes, cables, communication lines, and other similar equipment. These structures can be used for various purposes, including urban infrastructure, transportation systems, and buildings, and are often equipped with drainage and anti-clogging devices.

[0003] The existing utility tunnel connects to a single drainage pipe via multiple water pipes. Foreign objects, such as tree branches, tend to accumulate at the connection points of the drainage pipes, causing blockages. Currently, it is difficult to effectively break up tree branches and other debris when cleaning the pipe connection points, making it impossible to effectively and quickly remove such debris.

[0004] To address these issues, we propose a micro-pipe gallery drainage anti-clogging device and its system. Summary of the Invention

[0005] The purpose of this invention is to provide a micro-pipe gallery drainage anti-clogging device and system to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A micro-pipe gallery drainage anti-clogging device includes a water guide pipe and a crushing component. One end of the water guide pipe is fixedly connected to a sleeve, and the bottom end of the sleeve is fixedly connected to a water guide tank. The bottom surface of the water guide tank is connected to a drain pipe, and the lower end of the drain pipe is provided with a sludge storage pipe. The crushing component is disposed between the drain pipe and the water guide tank.

[0008] Through the above technical solutions, the crushing component can crush debris in the drain pipe, and the crushed debris can be directly flushed away by the water flow, thereby reducing the residue of debris and facilitating the smooth flow of the pipeline.

[0009] In a further embodiment, the crushing assembly includes a motor, which is fixedly mounted on the top surface of the sleeve. A bidirectional screw is rotatably connected inside the sleeve, and the top end of the bidirectional screw is fixedly connected to the output end of the motor. A first movable block is threadedly connected to the upper end of the bidirectional screw, and several connecting rods are hinged to the outer surface of the first movable block. A second movable block is threadedly connected to the lower end of the bidirectional screw. A base is provided in the middle of the second movable block, and a fixing rod is fixedly connected to the top surface of the base. A traction assembly is provided inside the several connecting rods.

[0010] Through the above technical solution: in the initial state, the multiple connecting rods of the crushing component are spread out in the water guide box, which facilitates the collection of debris such as branches.

[0011] In a further embodiment, the traction assembly includes a first movable rod disposed inside a connecting rod. A limit frame is provided on one side inside the connecting rod, and springs are installed on both sides inside the limit frame. A hook is provided on one side of several connecting rods.

[0012] The above technical solution allows for better securing of debris by facilitating the connection between the connecting rod and the hook. This makes it easier for the crushing component to pull the debris from the water guide tank into the drainage tank, facilitating subsequent crushing operations.

[0013] In a further embodiment, a plurality of the connecting rods are arranged in a ring around the center of the first movable block, and gaps are left between the plurality of connecting rods and between the fixed rods. A stop block is fixedly installed near the upper end of the bidirectional screw, and a torsion spring is provided at the hinge point between the connecting rod and the first movable block.

[0014] Through the above technical solution: gaps are left between the connecting rods and fixed rods distributed around the perimeter, so that multiple connecting rods and fixed rods can cross each other during the crushing process, thereby fully crushing the debris and further improving the crushing efficiency. By providing torsion springs at the hinge points of the connecting rods and the first movable block, when the connecting rods are disengaged from the drain pipe, multiple connecting rods can automatically expand to a certain angle under the action of the torsion springs, thereby facilitating the passage of the baffle. Under the action of the baffle, multiple connecting rods can be stretched to the maximum angle in the water guide box to receive the debris.

[0015] In a further embodiment, a wedge-shaped through groove is formed on the outer surface of the first movable block, and the size of the fixing rod matches the size of the through groove.

[0016] The above technical solution allows the fixed rod to pass smoothly through the wedge-shaped through groove, enabling the connecting rod and the fixed rod to intersect, which is beneficial to the stable operation of the crushing unit.

[0017] In a further embodiment, one end of the hook is connected to a block, and the block connected to the bottom end of the hook is rotatably connected to the connecting rod by a pin. A second movable rod is hinged between the first movable rod and the block at the bottom end of the hook.

[0018] Through the above technical solution: the hook is rotatably connected to the connecting rod through the block connected to the bottom end. When the second movable rod applies force through the first movable rod, the second movable rod can drive the hook to flip up and down, thereby facilitating the grabbing of debris.

[0019] In a further embodiment, the bottom end of the sludge storage pipe is threaded with a cap, and the second movable block is threadedly connected to the base.

[0020] A method for preventing clogging in the drainage system of a micro-pipe gallery includes the following steps:

[0021] S1: In the initial state, the motor is started, which drives the bidirectional screw to rotate. At this time, the first movable block and the second movable block move to the two ends of the bidirectional screw respectively. The first movable block gradually moves into the interior of the water guide tank. At this time, several connecting rods are separated from the inner wall of the drain pipe and spread out under the action of the torsion spring. When the multiple connecting rods abut against the stop block, the connecting rods are fully opened and the base moves to the bottom of the sewage pipe.

[0022] S2: As the connecting rod is pushed open by the stop block, the first movable rod gradually touches the upper inner wall of the water guide tank. Under the action of pressure, the first movable rod applies pressure to the spring inside the limit frame. At this time, the first movable rod begins to retract. While the first movable rod is retracting, the first movable rod pulls the hook upward and flips it through the second movable rod.

[0023] S3: The water pipe drains water into the water tank. Some impurities fall into the open connecting rod, while others fall onto the base in the sludge collection pipe. During cleaning, the motor drives the bidirectional screw to rotate. At this time, the first and second movable blocks move towards the middle of the bidirectional screw simultaneously. As the first movable rod disengages from the inner wall of the water tank, the compressed spring recovers its deformation. The first movable rod then pops upward and pulls multiple hooks downward through the second movable rod. The downward-flipped hooks further secure branches and other impurities.

[0024] S4: When multiple connecting rods enter the drain pipe, the connecting rods begin to retract. The fixed rod and the base gradually move upward through the through groove under the action of the second movable block. At this time, the fixed rod and the connecting rod intersect, thus crushing the debris in the drain pipe. Then, the water flow can wash away some of the crushed debris through the drain pipe, and some of the remaining debris falls into the sludge collection pipe, which is cleaned regularly by the staff.

[0025] Compared with the prior art, the beneficial effects of the present invention are:

[0026] 1. By setting up a crushing component, in the initial state, multiple connecting rods in the crushing component are spread out in the water guide tank, which facilitates the connection rods to receive debris in the water guide tank. When cleaning is required, under the action of the traction component, multiple hooks flip over, thereby locking the branches and debris received by the multiple connecting rods. The traction component and the crushing component work together to pull the debris in the water guide tank down to the drain pipe, further reducing the blockage of debris in the water guide tank. By setting multiple connecting rods and multiple fixed rods to cross in the drain pipe, the pulled debris is crushed, which is easily flushed away by the water flow through the drain pipe. While the crushing efficiency is high, it further reduces the amount of debris left in the sludge pipe, thereby reducing the number of times the sludge pipe needs to be cleaned by the staff.

[0027] 2. At the same time, the connecting rods in the crushing component are in an open state when they enter the water guide tank. Multiple connecting rods form a larger filtration area, which can effectively filter the water entering the water guide tank, intercept larger foreign objects, reduce the amount of large foreign objects in the drain pipe, and prevent the drain pipe from becoming blocked.

[0028] 3. The connecting rod is equipped with multiple hooks. When the connecting rod is extended to its maximum angle, the hooks extend on the surface of the connecting rod. The hooks can catch cloth or plastic debris. The multiple hooks can make the surface of the connecting rod more secure in fixing debris, preventing cloth or plastic debris from entering the drain pipe and increasing the anti-clogging effect of the drain pipe. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the drainage pipe structure in this invention;

[0030] Figure 2 This is a schematic diagram of the sewage storage pipe structure in this invention;

[0031] Figure 3 This is a schematic diagram of the connecting rod structure in this invention;

[0032] Figure 4 This is a schematic diagram of the fixing rod structure in this invention;

[0033] Figure 5 This is a schematic diagram of the hook structure in this invention;

[0034] Figure 6 This is a schematic diagram of the second active block structure in the present invention;

[0035] Figure 7 This is a schematic diagram of the limiting frame structure in this invention;

[0036] Figure 8 This is an enlarged structural diagram of point A in this invention.

[0037] In the diagram: 1. Water guide pipe; 2. Sleeve; 3. Water guide tank; 4. Drain pipe; 5. Sewage collection pipe; 6. Cap; 7. Motor; 8. Double-acting screw; 9. First movable block; 10. Connecting rod; 11. Hook; 12. First movable rod; 13. Stop block; 14. Second movable block; 15. Base; 16. Fixing rod; 17. Through groove; 18. Limiting frame; 19. Spring; 20. Second movable rod. Detailed Implementation

[0038] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0039] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0040] Please see Figures 1-8 Example 1: A micro-pipe gallery drainage anti-clogging device includes a water guide pipe 1 and a crushing component. One end of the water guide pipe 1 is fixedly connected to a sleeve 2. The characteristic is that the bottom end of the sleeve 2 is fixedly connected to a water guide tank 3. The bottom surface of the water guide tank 3 is connected to a drain pipe 4. The lower end of the drain pipe 4 is provided with a sludge storage pipe 5. The crushing component is disposed between the drain pipe 4 and the water guide tank 3.

[0041] Specifically, in the initial state, the motor 7 is started, which drives the bidirectional screw 8 to rotate. At this time, the first movable block 9 and the second movable block 14 move to the two ends of the bidirectional screw 8 respectively. The first movable block 9 gradually moves into the interior of the water guide tank 3. At this time, several connecting rods 10 are separated from the inner wall of the drain pipe 4 and are spread out under the action of the torsion spring. When the multiple connecting rods 10 abut against the stop block 13, the connecting rods 10 are fully opened, and the base 15 moves to the bottom of the sewage pipe 5. By setting multiple connecting rods 10 to be spread out inside the water guide tank 3, it is easier to receive branches and other debris carried by the water flow.

[0042] Furthermore, the crushing assembly includes a motor 7, which is fixedly mounted on the top surface of the sleeve 2. A bidirectional screw 8 is rotatably connected inside the sleeve 2, and the top end of the bidirectional screw 8 is fixedly connected to the output end of the motor 7. A first movable block 9 is threadedly connected to the upper end of the bidirectional screw 8. Several connecting rods 10 are hinged to the outer surface of the first movable block 9. A second movable block 14 is threadedly connected to the lower end of the bidirectional screw 8. A base 15 is provided in the middle of the second movable block 14. A fixing rod 16 is fixedly connected to the top surface of the base 15. A traction assembly is provided inside the several connecting rods 10. The traction assembly includes a first movable rod 12, which is located inside the connecting rods 10. A limit frame 18 is provided on one side inside the connecting rods 10. Springs 19 are installed on both sides inside the limit frame 18. A hook 11 is provided on one side of the several connecting rods 10.

[0043] Specifically, as the connecting rod 10 is opened by the stop block 13, the first movable rod 12 gradually contacts the upper inner wall of the water guide tank 3. Under pressure, the first movable rod 12 applies pressure to the spring 19 inside the limit frame 18. At this time, the first movable rod 12 begins to retract. While retracting, the first movable rod 12 pulls the hook 11 upward through the second movable rod 20, causing the water guide pipe 1 to drain water into the water guide tank 3. Some impurities fall into the opened connecting rod 10, while some impurities fall onto the base 15 in the dirt storage pipe 5. During cleaning, the motor 7 drives the bidirectional screw 8 to rotate. At this time, the first movable block 9 and the second movable block 14 simultaneously move towards the middle of the bidirectional screw 8. As the first movable rod 12 disengages from the inner wall of the water guide tank 3, the compressed spring 19 returns to its original shape. When the first movable rod 12 pops up, it pulls multiple hooks 11 downwards via the second movable rod 20. The downward-flipped hooks 11 further clamp branches and other debris. When multiple connecting rods 10 enter the drain pipe 4, the connecting rods 10 begin to retract. By setting a traction component, it is easier to flip the hooks 11 installed on the multiple connecting rods 10. The upward flipping of the hooks 11 makes it easier for debris to fall into the middle of the area surrounded by the multiple connecting rods 10. The downward flipping of the hooks 11 better fixes branches and other debris. When the first movable block 9 moves downwards, the connecting rods 10 and hooks 11 grab the debris accumulated in the water guide tank 3 and bring it to the drain pipe 4, which facilitates subsequent crushing and further reduces the accumulation inside the water guide tank 3, thus reducing pipe blockage.

[0044] Furthermore, a wedge-shaped through groove 17 is provided on the outer surface of the first movable block 9, and the size of the fixing rod 16 matches the size of the through groove 17.

[0045] Specifically, by setting the first movable block 9 and the second movable block 14 to approach each other under the rotation of the bidirectional screw 8, and by opening a wedge-shaped through groove 17 on the outer surface of the first movable block 9, a certain space is left for the fixed rod 16 and the connecting rod 10 to cross each other, so as to complete the crushing of debris. This crushing process takes place in the drain pipe 4, and then under the action of water flow, the crushed debris can be directly flushed away through the drain pipe 4, which greatly reduces the accumulation of debris inside the sludge storage pipe 5, thereby reducing the number of times the staff need to clean the sludge storage pipe 5.

[0046] Furthermore, several connecting rods 10 are arranged in a ring around the center of the first movable block 9, and gaps are left between the connecting rods 10 and between the fixed rods 16. A stop block 13 is fixedly installed near the upper end of the bidirectional screw 8, and a torsion spring is provided at the hinge point between the connecting rod 10 and the first movable block 9.

[0047] Specifically, a gap is left between the connecting rod 10 and the fixed rod 16 arranged around the perimeter, allowing the connecting rod 10 and the fixed rod 16 to intersect each other. By setting a torsion spring at the hinge point between the connecting rod 10 and the first movable block 9, when the connecting rod 10 enters the water guide tank 3, it can expand to a certain angle under the action of the torsion spring to allow the stop block 13 to pass through. By setting the stop block 13 to limit the bottom end of multiple connecting rods 10, the connecting rod 10 can be opened to the maximum angle.

[0048] Furthermore, one end of the hook 11 is connected to a block, and the block connected to the bottom end of the hook 11 is rotatably connected to the connecting rod 10 via a pin. A second movable rod 20 is hinged between the first movable rod 12 and the block at the bottom end of the hook 11.

[0049] Specifically, the hook 11 is rotatably connected to the connecting rod 10 via the block connected to its bottom end. When the second movable rod 20 applies force through the first movable rod 12, the second movable rod 20 can drive the hook 11 to rotate up and down, thereby facilitating the grabbing of debris.

[0050] Furthermore, the bottom end of the sludge storage pipe 5 is threadedly connected to a cap 6, and the second movable block 14 is threadedly connected to the base 15.

[0051] Specifically, by installing a cap 6 at the bottom of the sludge storage pipe 5, it is convenient for staff to open the cap 6 periodically to discharge the debris remaining in the sludge storage pipe 5, which helps to maintain the smooth flow of the pipeline.

[0052] Example 2: A method for preventing clogging in micro-pipe gallery drainage, using the micro-pipe gallery drainage anti-clogging device from Example 1, includes the following steps:

[0053] S1: In the initial state, the motor 7 is started, which drives the bidirectional screw 8 to rotate. At this time, the first movable block 9 and the second movable block 14 move to the two ends of the bidirectional screw 8 respectively. The first movable block 9 gradually moves to the inside of the water guide tank 3. At this time, several connecting rods 10 are separated from the inner wall of the drain pipe 4 and are spread out under the action of the torsion spring. When the multiple connecting rods 10 abut against the stop block 13, the connecting rods 10 are fully opened and the base 15 moves to the bottom of the sewage pipe 5.

[0054] S2: As the connecting rod 10 is pushed open by the stop block 13, the first movable rod 12 gradually contacts the upper inner wall of the water guide tank 3. Under the pressure, the first movable rod 12 applies pressure to the spring 19 inside the limit frame 18. At this time, the first movable rod 12 begins to retract. While the first movable rod 12 is retracting, the first movable rod 12 pulls the hook 11 upward through the second movable rod 20.

[0055] S3: The water pipe 1 drains water into the water tank 3. Some impurities fall into the open connecting rod 10, and some impurities fall into the base 15 in the sludge storage pipe 5. During cleaning, the motor 7 drives the bidirectional screw 8 to rotate. At this time, the first movable block 9 and the second movable block 14 move towards the middle of the bidirectional screw 8 at the same time. As the first movable rod 12 disengages from the inner wall of the water tank 3, the compressed spring 19 returns to its original shape. At this time, the first movable rod 12 pops up and pulls multiple hooks 11 downward through the second movable rod 20. The downward-turned hooks 11 further clamp the branches and other impurities.

[0056] S4: When multiple connecting rods 10 enter the drain pipe 4, the connecting rods 10 begin to retract. Under the action of the second movable block 14, the fixed rod 16 and the base 15 gradually move upward through the through groove 17. At this time, the fixed rod 16 and the connecting rod 10 intersect, thereby crushing the debris in the drain pipe 4. Then, the water flow can wash away some of the crushed debris through the drain pipe 4. Some of the remaining debris falls into the sludge storage pipe 5, which is cleaned regularly by the staff.

[0057] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0058] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A micro-pipe gallery drainage anti-clogging device, comprising a water guide pipe (1), one end of which is fixedly connected to a sleeve (2), characterized in that, The bottom end of the sleeve (2) is fixedly connected to a water guide box (3), the bottom surface of the water guide box (3) is connected to a drain pipe (4), and the lower end of the drain pipe (4) is provided with a sludge storage pipe (5). It also includes a crushing assembly installed between the drain pipe (4) and the water guide box (3); The crushing assembly includes a motor (7), which is fixedly installed on the top surface of the sleeve (2). A bidirectional screw (8) is rotatably connected inside the sleeve (2), and the top end of the bidirectional screw (8) is fixedly connected to the output end of the motor (7). A first movable block (9) is threadedly connected to the upper end of the bidirectional screw (8). Several connecting rods (10) are hinged to the outer surface of the first movable block (9). A second movable block (14) is threadedly connected to the lower end of the bidirectional screw (8). A base (15) is provided in the middle of the second movable block (14). A fixing rod (16) is fixedly connected to the top surface of the base (15). A traction assembly is provided inside the several connecting rods (10). The traction assembly includes a first movable rod (12), which is disposed inside the connecting rod (10). A limit frame (18) is provided on one side inside the connecting rod (10), and springs (19) are installed on both sides inside the limit frame (18). A hook (11) is provided on one side of several connecting rods (10). A number of connecting rods (10) are arranged in a ring around the center of the first movable block (9), and there is a gap between the connecting rods (10) and between the fixed rod (16). A stop block (13) is fixedly installed near the upper end of the bidirectional screw (8), and a torsion spring is provided at the hinge of the connecting rod (10) and the first movable block (9). The outer surface of the first movable block (9) is provided with a wedge-shaped through groove (17), and the size of the fixed rod (16) matches the size of the through groove (17); One end of the hook (11) is connected to a block, and the block connected to the bottom end of the hook (11) is rotatably connected to the connecting rod (10) by a pin. The first movable rod (12) is hinged to the block at the bottom end of the hook (11) and the second movable rod (20).

2. The micro-pipe gallery drainage anti-clogging device according to claim 1, characterized in that, The bottom end of the waste storage pipe (5) is threaded with a cap (6), and the second movable block (14) is threadedly connected to the base (15).

3. A method for preventing blockage in the drainage system of a micro-pipe gallery, characterized in that, The micro-pipe gallery drainage anti-clogging device according to claim 2 includes the following steps: S1: In the initial state, by starting the motor (7), the bidirectional screw (8) is driven to rotate. At this time, the first movable block (9) and the second movable block (14) move to the two ends of the bidirectional screw (8) respectively. The first movable block (9) gradually moves to the inside of the water guide tank (3). At this time, several connecting rods (10) are separated from the inner wall of the drain pipe (4). Under the action of the torsion spring, they are spread out. When the multiple connecting rods (10) abut against the stop block (13), the connecting rods (10) are fully opened, and the base (15) moves to the bottom of the sewage pipe (5). S2: While the connecting rod (10) is opened by the stop block (13), the first movable rod (12) gradually touches the upper inner wall of the water guide tank (3). Under the action of pressure, the first movable rod (12) applies pressure to the spring (19) inside the limit frame (18). At this time, the first movable rod (12) begins to retract. While the first movable rod (12) is retracting, the first movable rod (12) pulls the hook (11) upward through the second movable rod (20). S3: The water pipe (1) drains water into the water tank (3). Some impurities fall into the open connecting rod (10), and some impurities fall into the base (15) in the sewage pipe (5). During cleaning, the motor (7) drives the double screw (8) to rotate. At this time, the first movable block (9) and the second movable block (14) move towards the middle of the double screw (8) at the same time. While the first movable rod (12) is separated from the inner wall of the water tank (3), the squeezed spring (19) recovers its deformation. At this time, the first movable rod (12) pops up. The first movable rod (12) pulls multiple hooks (11) downward through the second movable rod (20). The downward-turned hooks (11) further clamp the branches and impurities. S4: When multiple connecting rods (10) enter the drain pipe (4), the connecting rods (10) begin to retract. The fixed rod (16) and the base (15) gradually move upward through the through groove (17) under the action of the second movable block (14). At this time, the fixed rod (16) and the connecting rod (10) intersect, thereby crushing the debris in the drain pipe (4). Then, the water flow can wash away some of the crushed debris through the drain pipe (4). Some of the remaining debris falls into the sludge storage pipe (5), which is cleaned regularly by the staff.

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