A drainage device for foundation pit slope

Abstract

The application provides a drainage device for a foundation pit slope, and belongs to the technical field of slope drainage. The drainage device comprises a drainage pipe, the drainage pipe is obliquely inserted into the slope, a row of water-permeable holes are arranged on the surface of the drainage pipe at intervals along the extension direction of the drainage pipe, and the drainage device further comprises an inner pipe movably sleeved in the drainage pipe and an intercepting mechanism. The intercepting mechanism is in a plurality of and is distributed along the axial direction of the inner pipe and corresponds to the water-permeable holes one by one. The intercepting mechanism is arranged, after a period of drainage, if the cotton layer is blocked, the inner pipe is rotated, the connecting pipe and the scraping assembly are driven to rotate, the adjacent inner pipe is connected to the water-permeable hole one, after the new cotton layer is replaced, the normal drainage of the accumulated water is ensured, the service life of the drainage pipe is prolonged, and in the rotating process of the scraping assembly, the blocked soil at the water-permeable hole one is removed, so that the water permeability of the water-permeable hole one is restored, and the normal drainage of the accumulated water is further ensured.

Description

Technical Field

[0001] This invention relates to the field of slope drainage technology, and in particular to a drainage device for foundation pit slopes. Background Technology

[0002] During the excavation of the foundation pit, the slope of the excavated foundation pit needs to be sandblasted for protection. However, before sandblasting, steel pipes need to be inserted into the slope at an angle, and the surface of the steel pipes is provided with water-permeable holes. When there is water accumulation in the slope, the water can seep into the steel pipe through the water-permeable holes and then flow out from the end of the steel pipe, thereby realizing the drainage of the slope. Secondly, before the steel pipes are inserted into the slope, cotton needs to be wrapped around their surface to reduce the amount of silt entering the steel pipes during the drainage process and prevent the steel pipes from becoming blocked.

[0003] During the drainage process, cotton can intercept soil and prevent it from entering the steel pipe and clogging it. However, after prolonged use, the intercepted soil will clog the cotton, preventing water from passing through the cotton into the steel pipe and affecting slope drainage. Therefore, this application provides a drainage device for foundation pit slopes to meet the requirements. Summary of the Invention

[0004] This invention provides a drainage device for foundation pit slopes to solve the problem that after cotton has been used for a long time, the soil intercepted by the cotton will block the cotton, thus preventing water from passing through the cotton into the steel pipe and affecting the drainage of the slope.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0006] A drainage device for foundation pit slopes includes a drainage pipe, which is inserted obliquely into the slope. A row of permeable holes is spaced apart on the surface of the drainage pipe along its extension direction. The device also includes:

[0007] The inner pipe is movably fitted inside the drain pipe;

[0008] The interception mechanism has multiple interception mechanisms distributed along the inner axial direction of the drain pipe and corresponding one-to-one with the position of the water inlet. Each interception mechanism includes three interception sub-mechanisms that are spaced apart around the inner pipe.

[0009] Each interception sub-mechanism includes a water-permeable hole two corresponding to the surface of the inner tube, a connecting pipe corresponding to and connected to the water-permeable hole two and located on the outside of the inner tube, a sealing ring sealing between the inner walls of the connecting pipe and the drain pipe, an L-shaped pipe corresponding to and connected to the water-permeable hole two and located on the inside of the inner tube, a cotton layer located at the bottom of the inner wall of the connecting pipe, and a scraping component located above the cotton layer.

[0010] The top of the scraping component in the top interception sub-mechanism of the interception mechanism extends to a water inlet and is engaged in the water inlet. The scraping components in the two side interception sub-mechanisms move in contact with the inner wall of the drain pipe.

[0011] Preferably, a guide head is fixed to the end of the drain pipe, and the end of the guide head is arc-shaped.

[0012] Preferably, a triangular truncated pyramid is fixed at the outlet of the L-shaped pipe, and a baffle is fixed on the surface of the triangular truncated pyramid, with the end of the baffle fixed to the end of the L-shaped pipe.

[0013] Preferably, the inner wall of the connecting pipe is fixed with two grids, the cotton layer is fixed between the two grids, and the edges of the grids are bent away from the inner pipe.

[0014] Preferably, the scraping assembly includes multiple sets of elastic strips fixed to the surface of the grid, with two elastic strips in each set. A scraper is fixed to the end of each elastic strip. The scraper located at one of the water permeable holes is engaged in the water permeable hole, and the scraper away from the water permeable hole is slidably connected to the inner wall of the drain pipe. The inner wall of the water permeable hole is provided with an inclined surface.

[0015] Preferably, the scraper surface is fixed with multiple protrusions, and the length of the protrusions near the inner tube direction decreases sequentially.

[0016] Preferably, a plurality of arched rubber strips are fixed on the surface of the grid, and the ends of the arched rubber strips abut against the inner wall of the connecting pipe.

[0017] Preferably, the end of the drain pipe is provided with a limiting component, which is used to guide the insertion of the inner pipe and to limit the axial movement of the inner pipe after insertion.

[0018] Preferably, the limiting component includes a guide ring fixed to the end of the drain pipe, the end of the guide ring having multiple through holes, the outer wall of the inner pipe being rotatably connected to the inner wall of the guide ring, a handle being fixedly sleeved on the surface of the inner pipe, the end of the handle being slidably connected to the end of the guide ring, the surface of the handle having anti-slip stripes, and a snap-fit ​​component being fixed on the surface of the handle, the snap-fit ​​component consisting of an elastic part and a snap-fit ​​part, after the inner pipe is installed, the snap-fit ​​part snaps into the end of the guide ring, a guide surface one is provided on the side of the through hole away from the inner pipe, and a guide surface two is provided on the side of the through hole.

[0019] Preferably, a plurality of protrusions are fixed on the outer wall of the inner tube near the end, the position of the protrusions corresponding to the position of the connecting tube, a guide surface is provided on the end of the protrusion away from the handle, the end of the protrusion is attached to the inner wall of the drain pipe, connecting strips are fixed on opposite sides of the connecting tube, the connecting strips are fixed to the surface of the inner tube, the side of the connecting strip is slidably connected to the inner wall of the drain pipe, a round hole is provided on the surface of the elastic part, and a prompt mark is provided on the surface of the guide ring.

[0020] Compared with the prior art, the present invention has at least the following beneficial effects:

[0021] In the above scheme, by setting up an interception mechanism, during the drainage process, the scraping component can first intercept larger soil particles, preventing soil from entering the drainage pipe from the first permeable hole and preventing soil from clogging the inner pipe. Smaller soil particles, after entering the connecting pipe from the first permeable hole, can be intercepted by the cotton layer, again preventing soil from clogging the inner pipe. Subsequently, the accumulated water is discharged into the inner pipe after passing through the second permeable hole and the L-shaped pipe, and finally discharged from the end of the inner pipe. After a period of drainage, if the cotton layer becomes clogged, the inner pipe is rotated. The inner pipe will drive the connecting pipe and the scraping component to rotate, so that the adjacent inner pipe is connected to the first permeable hole. After replacing the cotton layer, the normal drainage of the accumulated water is ensured, and the service life of the drainage pipe is improved. During the rotation of the scraping component, it can remove the soil clogging the first permeable hole, thereby restoring the water permeability of the first permeable hole and further ensuring the normal drainage of the accumulated water.

[0022] By setting up a grid, the grid not only fixes the cotton layer but also intercepts soil, extending the service life of the cotton layer. Secondly, the edge of the grid bends towards the permeable hole, causing the edge of the cotton layer to also bend. The bend can guide water, thereby reducing the possibility of water flowing down from the connection between the cotton layer and the connecting pipe, and improving the interception effect of sediment.

[0023] By setting up an L-shaped pipe, the accumulated water is drained into the inner pipe through the L-shaped pipe, which can prevent the accumulated water from coming into contact with the unused cotton layer through the adjacent water permeable hole, thereby preventing the unused cotton layer from being contaminated by the mud and sand in the accumulated water.

[0024] By setting up a truncated triangular prism and a baffle, the water discharged from the L-shaped pipe can flow downwards along the truncated triangular prism, thereby preventing the slowly flowing water from flowing into the adjacent L-shaped pipes. This further prevents the unused cotton layer from being contaminated. As the water flows along the truncated triangular prism, the baffle can prevent the water from flowing downwards from both sides of the truncated triangular prism, further preventing the water from entering the adjacent L-shaped pipes.

[0025] By incorporating elastic strips, scrapers, and inclined surfaces, multiple scrapers can intercept soil during drainage, preventing larger pieces of mud from entering the connecting pipe through the permeable hole. As the inner pipe rotates, the inclined surfaces guide the scrapers, preventing them from getting stuck against the inner wall of the permeable hole and improving the smoothness of the rotation. As the scraper rotates into the drainage pipe, the elastic strips gradually bend, reserving space for the scraper to be stored inside the drainage pipe. Furthermore, during the rotation of the scraper, any mud stuck between the scrapers can be carried into the drainage pipe, thus cleaning the permeable area and ensuring the permeability of the permeable hole.

[0026] By setting up convex plates, the convex plate near the water permeable hole can intercept the soil passing between adjacent scrapers again, thereby increasing the service life of the cotton layer. Secondly, the length of the convex plates decreases sequentially, which can reduce the space occupied by multiple convex plates, allowing the connecting pipe to hold more intercepted soil. During the rotation of the scraper, multiple convex plates can prevent soil from sliding out between the two scrapers, ensuring that the soil at the water permeable hole can be cleaned smoothly.

[0027] By setting arched rubber strips, when the scraper moves towards the inner pipe, if there is already a lot of soil in the connecting pipe, the movement of the scraper can move the soil. At this time, the arched rubber strips can be compressed, providing space for the scraper to move and allowing the scraper to smoothly enter the connecting pipe, thereby preventing the scraper from getting stuck in the water permeable hole and improving the smoothness. Secondly, multiple arched rubber strips can also intercept larger soil particles, further increasing the service life of the cotton layer.

[0028] By setting a limiting component, when the inner tube is inserted into the drain pipe, the locking part can lock into the end of the guide ring, thereby further preventing the inner tube from falling out of the drain pipe and improving stability during use.

[0029] By setting guide surface one and guide surface two, before the inner tube is inserted into the drain pipe, the scraper protrudes from the connecting pipe. During the insertion of the inner tube into the drain pipe, guide surface one at the through hole can guide the scraper into the connecting pipe, eliminating the need to manually press the scraper into the connecting pipe and improving the convenience of inserting the inner tube into the drain pipe. Guide surface two can guide the connecting pipe to prevent it from getting stuck at the end of the guide ring, improving the smoothness of the inner tube insertion process. At the same time, the position of the through hole is offset from the position of the first water permeable hole, thereby preventing the scraper from getting stuck at the water permeable hole during the insertion of the inner tube into the drain pipe, further improving the smoothness of the inner tube insertion process.

[0030] By setting up a protrusion, a guide surface three, and a connecting strip, during the insertion of the inner pipe into the drain pipe, the protrusion is first guided by the guide surface three, allowing it to smoothly enter the drain pipe from the through hole. After entering the drain pipe, the protrusion fits against the inner wall of the drain pipe, supporting the inner pipe and ensuring that the inner pipe and drain pipe remain concentric, laying the foundation for subsequent drainage. After the protrusion enters the drain pipe, the connecting strip is located in the through hole, which acts as a limit to prevent the inner pipe from rotating, thus preventing the connecting pipe from getting stuck at the through hole. It also prevents the scraper from getting stuck at one point in the through hole due to the rotation of the inner pipe. Multiple connecting pipes are connected by the connecting strip, which also improves the connection strength between the connecting pipe and the inner pipe, preventing the connecting pipe from breaking during the rotation of the inner pipe and improving the connection strength at the connecting pipe.

[0031] By setting a circular hole and an indicator number, when the inner tube is inserted into the drain pipe and the locking part is engaged with the end of the guide ring, the circular hole will first stop at the initial position of the indicator number, thus indicating which cotton layer is currently in use. As the inner tube rotates, it can also indicate that the adjacent connecting pipe has rotated to the water permeable hole, and the indicator number can indicate which cotton layer is in use, preventing the cotton layer from being reused. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0033] Figure 2 This is a schematic diagram of the interception mechanism of the present invention;

[0034] Figure 3 For the present invention Figure 2 Enlarged view of the structure at point A in the middle;

[0035] Figure 4 This is a schematic diagram of the connecting pipe structure of the present invention;

[0036] Figure 5 This is a schematic diagram of the scraper structure of the present invention;

[0037] Figure 6 This is a schematic diagram of the structure at the truncated triangular prism of the present invention;

[0038] Figure 7 This is a schematic diagram of the connecting strip structure of the present invention;

[0039] Figure 8 This is a schematic diagram of the protrusion structure of the present invention;

[0040] Figure 9 This is a schematic diagram of the three structural points of the guiding surface of the present invention;

[0041] Figure 10 This is a schematic diagram of the structure at the guide ring of the present invention;

[0042] Figure 11 This is a schematic diagram of the grip structure of the present invention.

[0043] In the diagram: 1. Drain pipe; 2. Water permeable hole one; 3. Interception mechanism; 4. Inner pipe; 5. Connecting pipe; 6. Sealing ring; 7. Water permeable hole two; 8. L-shaped pipe; 9. Elastic strip; 10. Scraper; 11. Convex plate; 12. Arched rubber strip; 13. Triangular truncated pyramid; 14. Baffle; 15. Guide ring; 16. Through hole; 17. Guide surface one; 18. Guide surface two; 19. Protrusion; 20. Guide surface three; 21. Connecting strip; 22. Handle; 23. Snap-fit ​​part; 24. Elastic part; 25. Snap-fit ​​part; 26. Round hole; 27. Guide head; 28. Cotton layer; 29. ​​Grille.

[0044] As shown in the figure, specific structures and devices are labeled in the figure to clearly illustrate the structure of the embodiments of the present invention. However, this is only for illustrative purposes and is not intended to limit the present invention to the specific structure, device and environment. Those skilled in the art can adjust or modify these devices and environments according to specific needs, and such adjustments or modifications are still included in the scope of the appended claims. Detailed Implementation

[0045] The following is a detailed description of a drainage device for foundation pit slopes provided by the present invention, with reference to the accompanying drawings and specific embodiments. It should be noted that, to make the embodiments more detailed, the following embodiments are the best and preferred embodiments; those skilled in the art can also use other alternative methods to implement some known technologies; and the accompanying drawings are only for more specific description of the embodiments and are not intended to specifically limit the present invention.

[0046] like Figures 1-11 As shown, an embodiment of the present invention provides a drainage device for foundation pit slopes, including a drainage pipe 1, which is inserted obliquely into the slope. A row of permeable holes 2 are spaced apart on the surface of the drainage pipe 1 along its extension direction. The device also includes:

[0047] Inner pipe 4 is movably fitted inside drain pipe 1;

[0048] Interception mechanism 3, there are multiple interception mechanisms 3 distributed along the inner axis of the drain pipe 1 and corresponding one-to-one with the position of the water inlet 2. Each interception mechanism 3 includes three interception sub-mechanisms arranged at intervals around the inner pipe 4.

[0049] Each interception sub-mechanism includes a water-permeable hole 7 corresponding to the surface of the inner tube 4, a connecting pipe 5 corresponding to and connected to the water-permeable hole 7 and located on the outside of the inner tube 4, a sealing ring 6 sealing between the inner wall of the connecting pipe 5 and the inner wall of the drain pipe 1, an L-shaped pipe 8 corresponding to and connected to the water-permeable hole 7 and located on the inner side of the inner tube 4, a cotton layer 28 located at the bottom of the inner wall of the connecting pipe 5, and a scraping component located above the cotton layer 28.

[0050] The top of the scraping component in the top interception sub-mechanism of the interception mechanism 3 extends to the water permeable hole 2 and is engaged within it. The scraping components in the two side interception sub-mechanisms move and abut against the inner wall of the drainage pipe 1. The drainage pipe 1 is inserted at an angle into the slope to facilitate the drainage of accumulated water. The water permeable hole 2 serves as a channel for the accumulated water from the slope to enter the drainage pipe 1. The interception mechanism 3 intercepts sediment and clears the water permeable hole 2, preventing blockage of the drainage pipe 1. The inner pipe 4 can rotate relative to the drainage pipe 1. By adjusting the corresponding positions of the water permeable hole 2 7 and the water permeable hole 2 , different connecting pipes 5 can be used. The connecting pipe 5 provides installation space for the cotton layer 28 and the scraping component, achieving preliminary filtration of the accumulated water. The sealing ring 6 ensures a tight seal between the connecting pipe 5 and the inner wall of the drainage pipe 1. The sealing mechanism prevents unfiltered water from flowing into the drain pipe 1 through gaps; the L-shaped pipe 8 changes the direction of water flow, preventing backflow and contamination of the unused cotton layer 28; the cotton layer 28 intercepts fine silt, and the scraper component intercepts large particles of silt and clears the water-permeable hole 2; during use, slope water enters through the water-permeable hole 2, the scraper component first intercepts large particles of silt, and the fine silt is intercepted by the cotton layer 28 in the connecting pipe 5, and the filtered water enters the inner pipe 4 through the water-permeable hole 7 and the L-shaped pipe 8 for discharge; when the cotton layer 28 is blocked, rotating the inner pipe 4 drives the connecting pipe 5 and the scraper component to rotate synchronously, so that the unused cotton layer 28 corresponds to the water-permeable hole 2, and at the same time the scraper component clears the blocked silt in the water-permeable hole 2 during rotation, ensuring continuous and smooth drainage.

[0051] like Figure 8 As shown in this embodiment, a guide head 27 is fixed to the end of the drainage pipe 1. The end of the guide head 27 is arc-shaped. The guide head 27 provides guidance for the insertion of the drainage pipe 1 into the slope. The arc-shaped end reduces the contact resistance with the soil during insertion and improves the smoothness of the insertion of the drainage pipe 1 into the slope.

[0052] like Figure 6 As shown in this embodiment, a triangular truncated pyramid 13 is fixed at the outlet of the L-shaped pipe 8, and a baffle 14 is fixed on the surface of the triangular truncated pyramid 13. The end of the baffle 14 is fixed to the end of the L-shaped pipe 8. The triangular truncated pyramid 13 guides the water discharged from the L-shaped pipe 8 to flow in a directional direction to prevent the water from spreading. The baffle 14 restricts the flow range of the water to prevent the water from flowing back to the adjacent unused L-shaped pipe 8 and the connecting pipe 5, thus avoiding contamination of the unused cotton layer 28.

[0053] like Figure 3As shown in this embodiment, two grids 29 are fixed to the inner wall of the connecting pipe 5, and the cotton layer 28 is fixed between the two grids 29. The edges of the grids 29 are bent away from the inner pipe 4. The grids 29 fix the cotton layer 28 and prevent the cotton layer 28 from shifting due to water flow impact. The edge bending structure guides the water to flow towards the center of the cotton layer 28, preventing water from flowing through the gap between the grids 29 and the connecting pipe 5, thus improving the filtration effect. At the same time, the grids 29 can initially intercept larger particles of silt, reducing the filtration burden on the cotton layer 28.

[0054] like Figure 3 As shown in this embodiment, the scraping component includes multiple sets of elastic strips 9 fixed to the surface of the grid 29. Each set of elastic strips 9 consists of two strips, and a scraper 10 is fixed to the end of each elastic strip 9. The scraper 10 located at the water permeable hole 2 is engaged in the water permeable hole 2, and the scraper 10 away from the water permeable hole 2 is slidably connected to the inner wall of the drain pipe 1. The inner wall of the water permeable hole 2 has a slope. In the drainage state, the scraper 10 is engaged in the water permeable hole 2 to intercept large particles of mud and sand. When it is necessary to replace the cotton layer 28 and rotate the inner tube 4, the slope guides the scraper 10 to disengage from the water permeable hole 2, and the elastic strip 9 is squeezed and bent, so that the scraper 10 smoothly enters the drain pipe 1 and slides along the inner wall.

[0055] like Figure 5 As shown in this embodiment, multiple protruding plates 11 are fixed on the surface of the scraper 10. The length of the protruding plates 11 decreases sequentially in the direction close to the inner tube 4. The protruding plates 11 further intercept the fine mud and sand that leaks through the gaps in the scraper 10, thereby improving the primary filtration effect. The decreasing length along the direction close to the inner tube 4 can reduce the internal space occupied by the protruding plates 11 in the connecting pipe 5, thereby increasing the mud and sand capacity. When water passes through the gaps in the scraper 10, the protruding plates 11 intercept the residual mud and sand. When rotating for cleaning, the protruding plates 11 can drive the attached mud and sand to move synchronously, preventing the mud and sand from sliding back into the permeable hole 2 from the gaps in the scraper 10.

[0056] like Figure 3 As shown in this embodiment, multiple arched rubber strips 12 are fixed on the surface of the grid 29. The ends of the arched rubber strips 12 abut against the inner wall of the connecting pipe 5. When a lot of mud and sand accumulates in the connecting pipe 5, when the scraper 10 is rotated, the mud and sand squeeze the arched rubber strips 12 to shrink them, making room for movement and ensuring that the scraper 10 can smoothly enter the connecting pipe 5. At the same time, the rubber strips can intercept some of the mud and sand, improving the interception effect.

[0057] like Figure 7As shown in this embodiment, a limiting component is provided at the end of the drain pipe 1. The limiting component is used to guide the insertion of the inner pipe 4 and to limit the axial movement of the inner pipe 4 after insertion. When installing the inner pipe 4, the limiting component guides the inner pipe 4 to be inserted in the correct direction to avoid collision and damage between the connecting pipe 5, scraper 10 and other structures and the inner wall of the drain pipe 1. After insertion, the limiting component restricts the axial movement of the inner pipe 4 to prevent the inner pipe 4 from detaching from the drain pipe 1 due to water flow impact or vibration during the drainage process.

[0058] like Figures 7-11 As shown, in this embodiment, the limiting component includes a guide ring 15 fixed to the end of the drain pipe 1. The end of the guide ring 15 has multiple through holes 16. The outer wall of the inner pipe 4 is rotatably connected to the inner wall of the guide ring 15. A handle 22 is fixedly sleeved on the surface of the inner pipe 4. The end of the handle 22 is slidably connected to the end of the guide ring 15. The surface of the handle 22 has anti-slip stripes. A snap-fit ​​component 23 is fixed to the surface of the handle 22. The snap-fit ​​component 23 consists of an elastic part 24 and a snap-fit ​​part 25. After the inner pipe 4 is installed, the snap-fit ​​part 25 snaps into the end of the guide ring 15. A guide surface 17 is provided on the side of the through hole 16 away from the inner pipe 4. A side surface of the through hole 16 has... Guide surface 18 and guide ring 15 provide rotational support and insertion guidance for inner tube 4, ensuring that inner tube 4 and drain pipe 1 are coaxial; through hole 16 provides insertion channels for protrusion 19, connecting strip 21, etc. on inner tube 4; handle 22 provides a force application point for rotating inner tube 4, and anti-slip stripes increase hand friction to avoid slipping during rotation; elastic part 24 of snap fastener 23 provides elastic deformation capability, and snap fastener 25 realizes axial limitation after inner tube 4 is inserted; guide surface 17 guides scraper 10 into connecting pipe 5 to avoid scraper 10 getting stuck during insertion; guide surface 18 guides connecting pipe 5 through through hole 16 to prevent connecting pipe 5 from colliding with guide ring 15.

[0059] like Figures 7-11As shown, in this embodiment, multiple protrusions 19 are fixed on the outer wall of the inner tube 4 near its end. The positions of the protrusions 19 correspond to the positions of the connecting tube 5. A guide surface 20 is provided at the end of the protrusion 19 away from the handle 22. The end of the protrusion 19 is attached to the inner wall of the drain pipe 1. Connecting strips 21 are fixed on opposite sides of the connecting tube 5. The connecting strips 21 are fixed to the surface of the inner tube 4. The side of the connecting strips 21 is slidably connected to the inner wall of the drain pipe 1. A round hole 26 is provided on the surface of the elastic part 24. A prompt mark is provided on the surface of the guide ring 15. To ensure the coaxiality of the inner tube 4 and the drain pipe 1, and to prevent the inner tube 4 from shifting when rotating; the guide surface 3 20 assists the protrusion 19 to pass smoothly through the through hole 16; the connecting strip 21 enhances the connection strength between the connecting pipe 5 and the inner tube 4, while limiting the rotation of the inner tube 4 when inserted, and preventing the scraper 10 from getting stuck between the water permeable hole 1 2; the round hole 26 cooperates with the indicator number to indicate the position of the currently used cotton layer 28; when the inner tube 4 is inserted, the protrusion 19 is guided into the through hole 16 through the guide surface 3 20, and the connecting strip 21 slides along the through hole 16 to prevent the inner tube 4 from rotating when inserted.

[0060] Working principle: The inner tube 4 is inserted into the drain pipe 1. The protrusion 19 on the surface of the inner tube 4 enters the interior of the drain pipe 1 along the through hole 16 on the guide ring 15. The guide surface 20 of the protrusion 19 ensures its smooth insertion. At the same time, the connecting strip 21 on the outer wall of the inner tube 4 is slidably connected to the through hole 16 of the guide ring 15, which plays a role in axial limiting and anti-rotation of the inner tube 4. When the inner tube 4 is inserted into place, the snap-fit ​​part 25 snaps into the end of the guide ring 15 to complete the fixation of the inner tube 4. At the same time, the scraper 10 of the scraping component is guided into the interior of the connecting pipe 5 under the action of the guide surface 17 and the guide surface 28 to avoid the scraper 10 getting stuck during the installation process. Then the inner tube 4 is rotated so that the initial scraper 10 is snapped into the water permeable hole 2.

[0061] In use, the water accumulated in the slope enters the interior of the drainage pipe 1 through the permeable hole 2 on the surface of the drainage pipe 1. The scraper 10 and the convex plate 11 located at the permeable hole 2 first intercept larger soil particles to prevent them from entering the connecting pipe 5. Smaller soil particles enter the connecting pipe 5 through the permeable hole 2 and are intercepted by the cotton layer 28 on the inner wall of the connecting pipe 5. The water then flows into the L-shaped pipe 8 through the permeable hole 7 on the surface of the inner pipe 4. The triangular truncated pyramid 13 and the baffle 14 at the outlet of the L-shaped pipe 8 guide the water downward to prevent the water from flowing back to the adjacent L-shaped pipe 8 and to avoid contaminating the unused cotton layer 28. Finally, the water is discharged into the interior of the inner pipe 4 through the L-shaped pipe 8 and discharged from the end of the inner pipe 4.

[0062] When the cotton layer 28 becomes clogged due to intercepting mud and sand, the inner tube 4 is rotated. The rotation of the inner tube 4 drives the connecting tube 5 and the scraping component to rotate synchronously, so that the adjacent unused cotton layer 28 rotates to the water permeable hole 2. During the process of the scraper 10 rotating into the drain pipe 1, the scraper 10 compresses the mud. The mud will compress the arched rubber strip 12. After the arched rubber strip 12 is compressed, it provides space for the scraper 10. Then the elastic strip 9 bends further, and the scraper 10 carries the mud and sand into the drain pipe 1, thereby cleaning the water permeable hole 2.

[0063] When the inner tube 4 rotates, the inner tube 4 synchronously drives the elastic part 24 to rotate. The round hole 26 on the elastic part 24 will indicate the next prompt number, showing the position of the cotton layer 28 currently in use, so that the user can judge the usage status of the cotton layer 28 and avoid repeated use.

[0064] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A drainage device for foundation pit slope, comprising a drainage pipe (1), wherein the drainage pipe (1) is inserted obliquely into the slope, and a row of permeable holes (2) are spaced apart on the surface of the drainage pipe (1) along the extending direction of the drainage pipe (1), characterized in that, Also includes: The inner pipe (4) is movably fitted inside the drain pipe (1); Interception mechanism (3), there are multiple interception mechanisms (3) distributed along the inner axis of the drain pipe (1) and corresponding one-to-one with the position of the water inlet (2). Each interception mechanism (3) includes three interception sub-mechanisms arranged at intervals around the inner pipe (4); Each interception sub-mechanism includes a water-permeable hole 2 (7) corresponding to the surface of the inner tube (4), a connecting pipe (5) corresponding to and connected to the water-permeable hole 2 (7) and located on the outside of the inner tube (4), a sealing ring (6) sealing between the inner wall of the connecting pipe (5) and the drain pipe (1), an L-shaped pipe (8) corresponding to and connected to the water-permeable hole 2 (7) and located on the inside of the inner tube (4), a cotton layer (28) located at the bottom of the inner wall of the connecting pipe (5), and a scraping component located above the cotton layer (28); The top of the scraping component in the top intercepting sub-mechanism of the intercepting mechanism (3) extends to the water permeable hole (2) and is engaged in the water permeable hole (2). The scraping components in the two intercepting sub-mechanisms on the side are in contact with the inner wall of the drain pipe (1).

2. The drainage device for foundation pit slopes according to claim 1, characterized in that, The drain pipe (1) is fixed with a guide head (27) at its end, and the end of the guide head (27) is arc-shaped.

3. The drainage device for foundation pit slopes according to claim 1, characterized in that, A triangular truncated pyramid (13) is fixed at the outlet of the L-shaped pipe (8), and a baffle (14) is fixed on the surface of the triangular truncated pyramid (13). The end of the baffle (14) is fixed to the end of the L-shaped pipe (8).

4. The drainage device for foundation pit slopes according to claim 1, characterized in that, The inner wall of the connecting pipe (5) is fixed with two grids (29), and the cotton layer (28) is fixed between the two grids (29). The edges of the grids (29) are bent away from the inner pipe (4).

5. The drainage device for foundation pit slopes according to claim 4, characterized in that, The scraping assembly includes multiple sets of spring strips (9) fixed on the surface of the grid (29). Each set of spring strips (9) consists of two spring strips. A scraper (10) is fixed at the end of the spring strip (9). The scraper (10) located at the first water hole (2) is engaged in the first water hole (2). The scraper (10) away from the first water hole (2) is slidably connected to the inner wall of the drain pipe (1). The inner wall of the first water hole (2) is provided with a slope.

6. The drainage device for foundation pit slopes according to claim 5, characterized in that, The scraper (10) has multiple protrusions (11) fixed on its surface, with the length of the protrusions (11) near the inner tube (4) decreasing sequentially.

7. The drainage device for foundation pit slopes according to claim 5, characterized in that, The surface of the grid (29) is fixed with a plurality of arched rubber strips (12), the ends of which abut against the inner wall of the connecting pipe (5).

8. The drainage device for foundation pit slopes according to claim 1, characterized in that, The end of the drain pipe (1) is provided with a limiting component, which is used to guide the insertion of the inner pipe (4) and to limit the axial movement of the inner pipe (4) after insertion.

9. The drainage device for foundation pit slopes according to claim 8, characterized in that, The limiting component includes a guide ring (15) fixed to the end of the drain pipe (1). The end of the guide ring (15) is provided with multiple through holes (16). The outer wall of the inner tube (4) is rotatably connected to the inner wall of the guide ring (15). A handle (22) is fixedly sleeved on the surface of the inner tube (4). The end of the handle (22) is slidably connected to the end of the guide ring (15). Anti-slip stripes are provided on the surface of the handle (22). A snap-fit ​​part (23) is fixed on the surface of the handle (22). The snap-fit ​​part (23) is composed of an elastic part (24) and a snap-fit ​​part (25). After the inner tube (4) is installed, the snap-fit ​​part (25) snaps onto the end of the guide ring (15). A guide surface one (17) is provided on the side of the through hole (16) away from the inner tube (4). A guide surface two (18) is provided on the side of the through hole (16).

10. The drainage device for foundation pit slopes according to claim 9, characterized in that, Multiple protrusions (19) are fixed on the outer wall of the inner tube (4) near the end. The position of the protrusions (19) corresponds to the position of the connecting tube (5). A guide surface (20) is provided at the end of the protrusion (19) away from the handle (22). The end of the protrusion (19) is attached to the inner wall of the drain pipe (1). Connecting strips (21) are fixed on both sides of the connecting tube (5). The connecting strips (21) are fixed on the surface of the inner tube (4). The side of the connecting strips (21) is slidably connected to the inner wall of the drain pipe (1). A round hole (26) is provided on the surface of the elastic part (24). A prompt mark is provided on the surface of the guide ring (15).

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