A geotechnical drainage structure

Abstract

The present application discloses a geotechnical drainage structure, which relates to the field of geotechnical engineering, and includes a drainage channel and a drainage pipe arranged in the drainage channel, wherein the drainage pipe has a drainage hole on its peripheral side wall; the drainage pipe is provided with an end cap; the water outlet of the drainage pipe is located outside the drainage channel; the drainage pipe is coaxially provided with an outer cylinder, the outer cylinder is sleeved on the drainage pipe, the drainage hole is located inside the outer cylinder, and a drainage cavity is formed between the outer cylinder and the drainage pipe; the two ends of the outer cylinder are respectively provided with a first connection cover and a second connection cover, the first connection cover is located near the water inlet end of the drainage pipe, the first connection cover is provided with a water inlet communicating with the drainage cavity, and the drainage hole is located between the first connection cover and the second connection cover; the second connection cover is provided with a sewage outlet; a control member is provided between the drainage pipe and the outer cylinder; and a filter member is provided at the first connection cover of the outer cylinder. The present application has the effect of facilitating the cleaning of the drainage hole.

Description

Technical Field

[0001] The present application relates to the field of geotechnical engineering, and in particular to a geotechnical engineering drainage structure. Background Art

[0002] Geotechnical engineering is a type of underground construction engineering involving rocks and soil. Geotechnical engineering mainly studies issues such as foundations, slopes, and underground engineering. In geotechnical engineering, when it comes to slope construction, drainage structures are usually set up on the slopes to ensure the stability of the slope soil and protect the buildings around the slopes.

[0003] In the related art, a Chinese patent document with the authorization announcement number CN207714342U discloses a slope drainage structure, including a drainage channel opened in the slope and a drainage pipe fixed in the drainage channel. A filter layer is provided between the drainage channel and the drainage pipe. In addition, a drainage hole is provided on the outer wall of the drainage pipe, which is used to introduce water inside the slope into the drainage pipe and discharge it to the outside of the slope through the drainage pipe.

[0004] With respect to the above-mentioned related technologies, the inventors have found that there are at least the following problems in the technology: after long-term use of the drain pipe for drainage, silt and the like will adhere to the drain hole, which will easily affect the drainage effect and need to be cleaned; when cleaning, since the drain pipe is installed in the drainage channel, the position of the drain hole is located inside the drainage channel, so it is inconvenient to clean the drain hole. Summary of the invention

[0005] The present application provides a geotechnical engineering drainage structure, which can facilitate cleaning of drainage holes.

[0006] The present application provides a geotechnical engineering drainage structure, which adopts the following technical solution:

[0007] A geotechnical engineering drainage structure, comprising a drainage channel opened in a slope and a drainage pipe arranged in the drainage channel, wherein a drainage hole is opened on the peripheral side wall of the water inlet end of the drainage pipe; the drainage pipe is provided with an end cover for closing the water inlet end of the drainage pipe; the water outlet of the drainage pipe is located outside the drainage channel;

[0008] The drain pipe is coaxially provided with an outer cylinder, the outer cylinder is sleeved on the drain pipe, the drain hole is located in the outer cylinder, and a drain cavity is formed between the outer cylinder and the drain pipe; the two ends of the outer cylinder are respectively provided with a first connection cover and a second connection cover connected to the outer wall of the drain pipe, the first connection cover is located near the water inlet end of the drain pipe, the first connection cover is provided with a water inlet communicated with the drain cavity, the drain hole is located between the first connection cover and the second connection cover; the second connection cover is provided with a sewage outlet;

[0009] A control element for controlling the opening and closing of the sewage outlet is provided between the drainage pipe and the outer cylinder;

[0010] The outer cylinder is provided with a filter element covering the water inlet at the first connecting cover.

[0011] By adopting the above technical solution, during cleaning, the control part is used to open the sewage outlet, and then the pressurized clean water is intermittently injected into the drainage pipe from the water outlet end of the drainage pipe, so that the clean water enters the drainage cavity from the drainage hole, and then is discharged from the drainage cavity through the sewage outlet. When the clean water is pressurized and discharged into the drainage pipe, since the diameter of the drainage pipe is much larger than the diameter of the drainage hole, the drainage volume of the drainage hole is much smaller than the water intake of the drainage pipe, so that the water pressure in the drainage pipe is increased, so that the impact force of the clean water when it is discharged from the inner cavity of the drainage pipe into the inner cavity of the drainage cavity is used to flush the silt attached to the inner wall of the drainage hole. In addition, the clean water has a certain impact force when entering the drainage pipe, and can also flush the silt attached to the inner wall of the drainage pipe, and the sewage in the drainage pipe and the drainage cavity is discharged through the sewage outlet, so as to achieve the effect of better cleaning the drainage pipe and the drainage hole, and has the effect of facilitating the cleaning of the drainage hole.

[0012] Optionally, the control component includes a sealing disk coaxially arranged on the drain pipe and a control rod arranged on the outer cylinder, the sealing disk is provided with a connecting port, the outer cylinder is rotatably connected to the drain pipe, the control rod is used to drive the outer cylinder to rotate, and the operating end of the control rod is located outside the drainage channel; during cleaning, the control rod drives the outer cylinder to rotate until the connecting port and the sewage outlet are in a communicating state.

[0013] By adopting the above technical solution, when cleaning, the outer cylinder is rotated by the control rod until the communication port and the sewage outlet are in communication, so as to discharge the water in the drainage cavity. When cleaning is not needed, the outer cylinder is rotated by the control rod until the communication port and the sewage outlet are mutually misaligned, that is, the sewage outlet is blocked by the sealing disk, so that the water in the slope enters the drainage cavity from the water inlet and then flows into the drainage pipe from the drainage hole, so as to drain the water.

[0014] Optionally, there are multiple sewage outlets, and they are arranged at intervals along the circumference of the second connecting cover; the number of the connecting ports is the same as the number of the sewage outlets.

[0015] By adopting the above technical solution, during cleaning, multiple sewage outlets are used for discharge, so as to facilitate the discharge of sewage.

[0016] Optionally, a water diversion cylinder is coaxially arranged on the outer cylinder, the outer cylinder is located in the inner cavity of the water diversion cylinder, and the water outlet end of the water diversion cylinder is located outside the drainage channel; the water inlet end of the water diversion cylinder is provided with a mounting cover connected to the outer cylinder, the first connecting cover is located between the mounting cover and the second connecting cover, and the mounting cover is provided with a connecting port; when cleaning, the outer cylinder is rotated until the connecting port and the water inlet are misaligned with each other.

[0017] By adopting the above technical solution, when cleaning, the control rod is used to rotate the outer cylinder until the connecting port and the sewage outlet are connected. At this time, the connecting port and the water inlet are misaligned with each other, so as to facilitate the introduction of sewage in the drainage cavity into the sewage outlet for discharge, so as to facilitate the cleaning of the drainage pipe and the outer cylinder.

[0018] Optionally, a drainage groove is provided on the peripheral side wall of the water diversion cylinder, and the drainage groove is located between the first connecting cover and the second connecting cover; the water diversion cylinder is provided with a filter block at the drainage groove, and the outer cylinder is provided with a sealing block for controlling the opening and closing of the drainage groove, and when the outer cylinder is rotated to a state where the connecting port and the sewage outlet are in a communicating state, the sealing block and the drainage groove are in a mutually staggered state.

[0019] By adopting the above technical solution, when cleaning, the control rod is used to drive the outer cylinder to rotate until the connecting port and the sewage outlet are in a connected state. At this time, the connecting port and the water inlet are mutually offset, and the blocking block and the drainage groove are mutually offset, so that the drainage groove can be used to discharge the water in the slope while cleaning the drainage pipe. When cleaning is not required, the outer cylinder is rotated until the connecting port and the sewage outlet are mutually offset, and the sewage outlet is closed; at this time, the blocking block closes the drainage groove; the water inlet and the connecting port are connected, so that the water in the slope enters the drainage cavity through the connecting port, and enters the drainage pipe through the drainage hole for centralized discharge.

[0020] Optionally, the filter element includes a filter screen arranged in the drainage channel and gravel filled in the filter screen, and the filter screen is coated on one end of the water diversion cylinder.

[0021] By adopting the above technical solution, when in use, the filter net and crushed stones are used to filter the water in the slope to reduce the silt in the water from entering the outer cylinder and the drainage pipe, which is beneficial to ensure the drainage effect of the drainage pipe.

[0022] Optionally, the drain pipe is arranged to be inclined downward.

[0023] By adopting the above technical solution, it is convenient to discharge the water in the slope when in use; in addition, it is also convenient to discharge the sewage in the drainage cavity and the drainage pipe when cleaning.

[0024] Optionally, the drainage hole has a flared structure, and the flared opening of the drainage hole is arranged toward the inner cavity of the drainage pipe.

[0025] By adopting the above technical solution, it is helpful to increase the water pressure in the drain pipe during cleaning, so as to utilize the impact force when water is discharged into the drainage cavity to flush the drainage hole, thereby facilitating cleaning of the drainage hole.

[0026] In summary, the present application includes at least one of the following beneficial effects:

[0027] 1. When cleaning, use the control lever to rotate the outer cylinder until the sewage outlet is in the open state, and then intermittently inject pressurized clean water into the drain pipe to increase the water pressure in the drain pipe, so that the clean water in the drain pipe enters the drainage cavity through the drainage hole, flushes the silt on the inner wall of the drainage hole, and thus cleans the drainage hole;

[0028] 2. When cleaning the drain hole, the impact force of clean water can also be used to flush the silt on the inner wall of the drain pipe, thereby achieving the purpose of cleaning the drain pipe;

[0029] 3. When cleaning the drainage holes, the drainage groove on the water diversion cylinder can be used to discharge the water in the slope. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the structure of this embodiment of the present application;

[0031] Figure 2 is a cross-sectional schematic diagram of the present embodiment of the present application when cleaning the drain hole;

[0032] Figure 3 yes Figure 2 The enlarged schematic diagram of point A in the middle;

[0033] Figure 4 yes Figure 2 The enlarged schematic diagram of point B in the middle;

[0034] Figure 5 It is a cross-sectional schematic diagram of the drainage structure of this embodiment of the present application when in use.

[0035] Explanation of the accompanying drawings: 1. drainage channel; 2. drainage pipe; 21. end cover; 22. drainage hole; 3. drainage ditch; 4. outer cylinder; 41. first connecting cover; 411. slot; 412. water inlet; 42. second connecting cover; 421. sewage outlet; 43. blocking block; 5. drainage chamber; 6. control member; 61. sealing disk; 611. connecting port; 62. control rod; 621. rotating bracelet; 7. limiting member; 71. first limiting rod; 72. second limiting rod; 8. water diversion cylinder; 80. drainage trough; 801. filter block; 81. mounting cover; 811. connecting port; 9. filter member; 91. filter net; 92. gravel. DETAILED DESCRIPTION

[0036] The present application is further described in detail below in conjunction with the accompanying drawings.

[0037] A geotechnical engineering drainage structure disclosed in the embodiment of the present application is referred to as Figure 1The geotechnical drainage structure includes a drainage channel 1 excavated on the slope surface and a drainage pipe 2 installed in the drainage channel 1. The slope includes a drainage ditch 3 arranged at the toe of the slope, and the drainage pipe 2 drains the water in the slope into the drainage ditch 3. There are multiple drainage pipes 2, which are arranged at intervals along the length direction of the slope.

[0038] Reference Figure 2 and Figure 3 The water inlet end of the drain pipe 2 is located in the drainage channel 1, and the water inlet end of the drain pipe 2 is installed with an end cover 21, which is used to close the water inlet end of the drain pipe 2. The water outlet end of the drain pipe 2 is located outside the slope surface, and the water outlet end of the drain pipe 2 is arranged toward the drainage ditch 3. The drain pipe 2 is arranged to be inclined downward from the side where the slope shoulder is located to the side where the slope toe is located.

[0039] Reference Figure 2 and Figure 3 Drain holes 22 are evenly formed on the peripheral side wall of the drain pipe 2 near the end cover 21, which are used to introduce water in the slope into the drain pipe 2 for centralized discharge; there are multiple drain holes 22, which are completely located in the drainage channel 1. In addition, the opening of the drain hole 22 is set in a flared shape, and the flared opening of the drain hole 22 is set toward the inner cavity of the drain pipe 2, so as to reduce the silt in the water from entering the drain pipe 2 when discharging water.

[0040] Reference Figure 2 and Figure 3 , the drain pipe 2 is coaxially provided with an outer cylinder 4 for installing the drain pipe 2. The outer cylinder 4 is completely accommodated in the drainage channel 1, and the outer cylinder 4 is connected to the drain pipe 2 through a bearing, and the inner wall of the outer cylinder 4 is connected to the outer ring of the bearing. A first connection cover 41 is installed at one end of the outer cylinder 4 close to the end cover 21, and the first connection cover 41 is provided with a slot 411 for the end cover 21 to be inserted, and the end cover 21 and the first connection cover 41 are fixedly connected. The inner diameter of the outer cylinder 4 is larger than the outer diameter of the drain pipe 2. When the outer cylinder 4 is installed in the drain pipe 2, a drainage cavity 5 is formed between the outer cylinder 4 and the drain pipe 2.

[0041] Reference Figure 2 and Figure 3 The first end cover 21 is cylindrical in structure, and the first connection cover 41 is provided with a water inlet 412 for introducing water in the slope into the drainage cavity 5. The water inlet 412 is fan-shaped, and there are two water inlets 412, and the two water inlets 412 are symmetrically arranged relative to the axial direction of the outer cylinder 4.

[0042] Reference Figure 2 and Figure 3The second connection cover 42 is installed at one end of the outer tube 4 of the first connection cover 41 away from the end cover 21, which is used to guide the water in the drainage cavity 5 into the drainage pipe 2 for discharge. In addition, the drainage hole 22 is located between the first connection cover 41 and the second connection cover 42, so that the water in the slope is concentrated in the drainage cavity 5 and then discharged into the drainage pipe 2 through the drainage hole 22.

[0043] Reference Figure 2 and Figure 4 The second connection cover 42 is provided with a sewage outlet 421, which is used to discharge sewage in the drainage cavity 5 when the drainage hole 22 is cleaned. The inner diameter of the sewage outlet 421 is larger than the maximum inner diameter of the drainage hole 22; there are multiple sewage outlets 421, which are evenly spaced along the circumference of the second connection cover 42.

[0044] Reference Figure 2 In addition, a control member 6 is provided between the drain pipe 2 and the outer tube 4 to control the opening and closing of the sewage outlet 421. The control member 6 includes a sealing disc 61 coaxially fixed to the drain pipe 2 near the second connection cover 42 and a control rod 62 installed on the outer tube 4 near the second connection cover 42.

[0045] Reference Figure 1 , wherein the sealing disc 61 is a cylindrical structure, the outer diameter of the sealing disc 61 is the same as the inner diameter of the outer cylinder 4, and the sealing disc 61 is slidably connected to the inner cavity of the outer cylinder 4. The sealing disc 61 is provided with a connecting port 611 for connecting to the sewage outlet 421, so as to discharge the sewage in the drainage cavity 5 during cleaning. The size of the connecting port 611 is the same as that of the sewage outlet 421. The number of the connecting port 611 and the sewage outlet 421 is the same, so as to control the opening and closing of the sewage outlet 421.

[0046] Reference Figure 2 There are four control rods 62, which are arranged at equal intervals along the circumference of the outer tube 4. A rotating hand ring 621 is fixed to the end of the control rod 62 away from the second connection cover 42, and the rotating hand ring 621 is used to rotate the sealing disk 61. During installation, the rotating hand ring 621 is located outside the drainage channel 1, and the rotating hand ring 621 is sleeved on the drainage pipe 2. The rotating hand ring 621 is located between the second connection cover 42 and the water outlet end of the drainage pipe 2. The inner diameter of the rotating hand ring 621 is equal to the outer diameter of the drainage pipe 2. During installation, the inner cavity of the rotating hand ring 621 is slidably connected to the outer wall of the drainage pipe 2.

[0047] Reference Figure 2 A limiting member 7 is provided between the drain pipe 2 and the control rod 62 to limit the rotation range of the outer cylinder 4. The limiting member includes a first limiting rod 71 and a second limiting rod 72 fixed to the outer wall of the drain pipe 2, and is used to abut against the control rod 62.

[0048] Reference Figure 5, the first limiting rod 71 and the second limiting rod 72 are arranged at intervals along the circumference of the drain pipe 2, and one of the control rods 62 is located between the first limiting rod 71 and the second limiting rod 72. Magnets with opposite magnetic properties (not shown in the figure) are respectively embedded between the first limiting rod 71 and the control rod 62, and the two magnets are in contact with each other. Similarly, magnets with opposite magnetic properties are also respectively embedded between the second limiting rod 72 and the control rod 62, and the two magnets are in contact with each other. Magnet locking is used to achieve a detachable connection between the first limiting rod 71 and the control rod 62, or a detachable connection between the second limiting rod 72 and the control rod 62.

[0049] Reference Figure 5 When the control rod 62 rotates counterclockwise until the control rod 62 abuts against the first limit rod 71, the connecting port 611 and the drain port 421 are misaligned with each other, and the sealing disk 61 can be used to block the drain port 421 to guide the water in the slope that enters the drainage cavity 5 to be discharged into the drainage pipe 2 from the drainage hole 22.

[0050] Reference Figure 2 and Figure 4 When the control rod 62 rotates clockwise until the control rod 62 abuts against the second limit rod 72, the connecting port 611 and the sewage outlet 421 are arranged in a communicating state, and the drainage hole 22 can be cleaned; when cleaning, the sewage in the drainage cavity 5 is discharged by utilizing the connecting port 611 and the sewage outlet 421 to communicate with each other.

[0051] Reference Figure 3 and Figure 5 The outer cylinder 4 is coaxially provided with a water diversion cylinder 8, which is used to discharge the water in the slope during cleaning. The end of the water diversion cylinder 8 close to the end cover 21 is installed with a mounting cover 81 for mounting the drain pipe 2. During installation, the side wall of the end cover 21 is fixed to the side wall of the mounting cover 81; the end of the water diversion cylinder 8 away from the mounting cover 81 is located outside the slope surface of the slope, and the end of the water diversion cylinder 8 away from the mounting cover 81 is arranged toward the drain ditch 3. During installation, the water diversion cylinder 8 is sleeved on the outer cylinder 4, and there is a certain distance between the inner cavity of the water diversion cylinder 8 and the outer wall of the outer cylinder 4.

[0052] Reference Figure 2 and Figure 3 The mounting cover 81 is provided with a fan-shaped connection port 811 for connecting with the water inlet 412. When draining the water in the side slope, the outer cylinder 4 is rotated counterclockwise by rotating the hand ring 621 until the control rod 62 abuts against the first limiting rod, so that the connection port 811 and the water inlet 412 are in a communicating state, so as to guide the water in the side slope to be drained into the drainage cavity 5.

[0053] Reference Figure 2 and Figure 3When cleaning is required, the outer cylinder 4 is rotated clockwise by rotating the hand ring 621 until the control rod 62 abuts against the second limiting rod; the connecting port 811 and the water inlet 412 are in a mutually misaligned state, and the connecting port 811 is blocked by the mounting cover 81, thereby guiding the sewage in the drainage cavity 5 to be discharged into the connecting port 611, so as to guide the water in the slope to be discharged into the drainage cavity 5.

[0054] Reference Figure 4 The surrounding side walls of the water diversion cylinder 8 are provided with drainage grooves 80, which are used to drain the water in the slope through the water diversion cylinder 8 and discharge it out of the slope. The notch of the drainage groove 80 is larger than the drainage hole 22, and the drainage groove 80 is located between the first connection cover 41 and the second connection cover 42. The water diversion cylinder 8 is located at the drainage groove 80 with an interference fit with a filter block 801, and the filter block 801 is used to filter the water entering the water diversion cylinder 8. The number of the filter blocks 801 is the same as the number of the drainage grooves 80, and the filter blocks 801 are made of a water-permeable material such as sponge or geotextile.

[0055] Reference Figure 2 and Figure 4 In addition, the outer wall of the outer cylinder 4 is evenly fixed with a blocking block 43 for controlling the opening and closing of the drainage groove 80. The blocking block 43 is an arc-shaped structure, and the inner concave surface of the blocking block 43 is arranged toward the outer cylinder 4. When the outer cylinder 4 rotates to the state where the communication port 611 and the sewage outlet 421 are in a communicating state, the blocking block 43 and the drainage groove 80 are in a mutually dislocated state, so that when the drainage hole 22 is cleaned, the water in the slope can also be discharged through the water diversion cylinder 8.

[0056] Reference Figure 4 The outer cylinder 4 is provided with a filter 9 at the first connection cover 41, which is used to filter the water entering the drainage cavity 5 from the slope. The filter 9 includes a filter screen 91 and gravel 92 installed in the drainage channel 1. The gravel 92 is filled in the filter screen 91. When installed, the filter screen 91 is covered on one end of the water diversion cylinder 8 to filter the water entering the drainage cavity 5 from the slope.

[0057] Reference Figure 5 When in use, the outer cylinder 4 is rotated counterclockwise by rotating the hand ring 621 until the control rod 62 located between the first limit rod 71 and the second limit rod 72 abuts against the first limit rod 71; at this time, the connecting port 611 and the sewage outlet 421 are in a mutually misaligned state, so that the sewage outlet 421 is blocked by the sealing disk 61, the connecting port 811 and the water inlet 412 are in a communicating state, and the blocking block 43 closes the drainage groove 80 to guide the water entering the drainage cavity 5 from the slope to be discharged into the drainage pipe 2 from the drainage hole 22.

[0058] The implementation principle of a geotechnical drainage structure of the present application embodiment is as follows: when cleaning, the outer cylinder 4 is driven to rotate clockwise by rotating the hand ring 621 until the control rod 62 located between the first limit rod 71 and the second limit rod 72 abuts against the second limit rod 72; at this time, the connecting port 611 and the sewage outlet 421 are in a communicating state, and the connecting port 811 and the sewage outlet 421 are in a completely misaligned state, so that the water inlet 412 is blocked by the installation cover 81. Then, pressurized clean water is intermittently injected into the drainage pipe 2, so that the clean water enters the drainage cavity 5 from the drainage hole 22, and then is discharged from the drainage cavity 5 through the sewage outlet 421; at the same time, since the drainage volume of the drainage hole 22 is much smaller than the water inlet volume of the drainage pipe 2, the water pressure in the drainage pipe 2 is increased, so that the impact force of the clean water when it is discharged from the inner cavity of the drainage pipe 2 into the inner cavity of the drainage cavity 5 is used to flush the silt attached to the inner wall of the drainage hole 22, which has the effect of facilitating the cleaning of the drainage hole 22. In addition, during the process of injecting clean water, part of the water in the drain pipe 2 will be discharged from the water outlet end of the drain pipe 2 to improve the cleaning effect.

[0059] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A geotechnical engineering drainage structure, comprising a drainage channel (1) opened in a slope and a drainage pipe (2) arranged in the drainage channel (1), wherein a drainage hole (22) is opened on a side wall around a water inlet end of the drainage pipe (2); characterized in that: The drain pipe (2) is provided with an end cover (21) for sealing the water inlet end of the drain pipe (2); the water outlet of the drain pipe (2) is located outside the drainage channel (1), and the water outlet end of the drain pipe (2) is connected to a pressurized water pipe; The drain pipe (2) is coaxially provided with an outer cylinder (4), the outer cylinder (4) being sleeved on the drain pipe (2), the drain hole (22) being located inside the outer cylinder (4), and a drain cavity (5) being formed between the outer cylinder (4) and the drain pipe (2); a first connection cover (41) and a second connection cover (42) connected to the outer wall of the drain pipe (2) are respectively provided at both ends of the outer cylinder (4), the first connection cover (41) being located close to the water inlet end of the drain pipe (2), the first connection cover (41) being provided with a water inlet (412) communicating with the drain cavity (5), the drain hole (22) being located between the first connection cover (41) and the second connection cover (42); the second connection cover (42) being provided with a sewage outlet (421); A control component (6) for controlling the opening and closing of the sewage outlet (421) is provided between the drainage pipe (2) and the outer cylinder (4); The outer cylinder (4) is provided with a filter element (9) located at the first connection cover (41); A switch is provided at the water outlet end of the drainage pipe (2); the control member (6) comprises a sealing disc (61) coaxially arranged on the drainage pipe (2) and a control rod (62) arranged on the outer cylinder (4); the sealing disc (61) is provided with a communication port (611); the outer cylinder (4) is rotatably connected to the drainage pipe (2); the control rod (62) is used to drive the outer cylinder (4) to rotate; the operating end of the control rod (62) is located outside the drainage channel (1); when cleaning, the control rod (62) drives the outer cylinder (4) to rotate until the communication port (611) is in communication with the sewage outlet (421).

2. A geotechnical engineering drainage structure according to claim 1, characterized in that: There are a plurality of sewage outlets (421), which are arranged at intervals along the circumference of the second connection cover (42); the number of the communication ports (611) is the same as the number of the sewage outlets (421).

3. A geotechnical engineering drainage structure according to claim 1, characterized in that: The outer cylinder (4) is coaxially provided with a water diversion cylinder (8), the outer cylinder (4) is located in the inner cavity of the water diversion cylinder (8), and the water outlet end of the water diversion cylinder (8) is located outside the drainage channel (1); the water diversion cylinder (8) is provided with a mounting cover (81) connected to the outer cylinder (4), the first connecting cover (41) is located between the mounting cover (81) and the second connecting cover (42), and the mounting cover (81) is provided with a connecting port (811) for connecting with the outer cylinder (4); when cleaning, the outer cylinder (4) is rotated until the connecting port (811) and the water inlet (412) are in a mutually misaligned state.

4. A geotechnical engineering drainage structure according to claim 3, characterized in that: The water diversion cylinder (8) is provided with a drainage groove (80) on the peripheral side wall, and the drainage groove (80) is located between the first connection cover (41) and the second connection cover (42); the water diversion cylinder (8) is provided with a filter block (801) at the drainage groove (80), and the outer cylinder (4) is provided with a blocking block (43) for controlling the opening and closing of the drainage groove (80); when the outer cylinder (4) is rotated to a state where the communication port (611) is in communication with the sewage outlet (421), the blocking block (43) and the drainage groove (80) are in a mutually displaced state.

5. A geotechnical engineering drainage structure according to claim 3, characterized in that: The filter element (9) comprises a filter screen (91) arranged in the drainage channel (1) and gravel (92) filled in the filter screen (91); the filter screen (91) is coated on one end of the water diversion cylinder (8).

6. A geotechnical engineering drainage structure according to claim 1, characterized in that: The drainage pipe (2) is arranged to be inclined downward.

7. A geotechnical engineering drainage structure according to claim 1, characterized in that: The drainage hole (22) has a flared structure, and the flared end of the drainage hole (22) is arranged toward the inner cavity of the drainage pipe (2).

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