Large-diameter steel pipe pile sludge discharge device and sludge discharge method

Abstract

The application relates to a large-diameter steel pipe pile sludge discharge device and a sludge discharge method, and belongs to the technical field of sludge discharge operations. The device comprises a sludge discharge pipeline, a high-pressure gas lifting system and a high-pressure water spraying system. The sludge discharge pipeline comprises a sludge discharge main pipe and multiple sludge discharge branch pipes. The multiple sludge discharge branch pipes are located below the sludge discharge main pipe and are in communication with the sludge discharge main pipe. The high-pressure gas lifting system comprises an air compressor and a gas lifting pipe connected with the air compressor. One end of the gas lifting pipe, which is far away from the air compressor, is connected with the sludge discharge main pipe. The gas lifting pipe is used for generating negative pressure in the sludge discharge main pipe. The high-pressure water spraying system is used for spraying water to the end of the sludge discharge branch pipe, which is far away from the sludge discharge main pipe. The application has the effect of improving sludge discharge efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of dredging operation, in particular to a large-diameter steel pipe pile dredging equipment and a dredging method. BACKGROUND

[0002] In the construction process of water transportation engineering, a steel pipe pile with a certain diameter is usually arranged in the underwater foundation, and after the steel pipe pile is arranged, the silt in the steel pipe pile needs to be cleaned for subsequent construction.

[0003] At present, the commonly used dredging methods include air-lift dredging, dredging ship and long-arm excavator, etc. The long-arm excavator is suitable for dredging operation of ordinary height and ordinary diameter steel pipe piles, and is not suitable for large-diameter steel pipe piles (large-diameter steel pipe piles refer to steel pipe piles with a diameter of more than 6m and a height of more than 56m).

[0004] The existing air-lift equipment usually discharges the silt in the steel pipe pile through the dredging pipeline in a way of creating negative pressure. This way can be applied to large-diameter steel pipe piles, but since there are often clumps in the silt in the steel pipe pile, after a long time of dredging operation, part of the clumps may block the dredging pipeline, resulting in the need to spend time to clean the dredging pipeline, thereby affecting the dredging efficiency. SUMMARY

[0005] In order to improve the dredging efficiency, in the first aspect, the present application provides a large-diameter steel pipe pile dredging equipment.

[0006] The large-diameter steel pipe pile dredging equipment provided by the present application adopts the following technical scheme:

[0007] The large-diameter steel pipe pile dredging equipment comprises a dredging pipeline, a high-pressure air-lift system and a high-pressure water spraying system. The dredging pipeline comprises a dredging main pipe and a plurality of dredging branch pipes. The plurality of dredging branch pipes are located below the dredging main pipe and are in communication with the dredging main pipe. The high-pressure air-lift system comprises an air compressor and an air-lift pipe connected with the air compressor. One end of the air-lift pipe away from the air compressor is connected with the dredging main pipe. The air-lift pipe is used to create negative pressure in the dredging main pipe. The high-pressure water spraying system is used to spray water to the end of the dredging branch pipe away from the dredging main pipe.

[0008] By adopting the above technical scheme, the air compressor is started to make the air-lift pipe blow air in the dredging main pipe away from the dredging branch pipe, so as to generate negative pressure in the dredging main pipe. The high-pressure water spraying system is used to flush the silt surface in the steel pipe pile, so as to reduce the probability of silt clumping. The silt that is scattered can smoothly enter the dredging main pipe through the dredging branch pipe and finally be discharged through the dredging main pipe. The risk of blocking the dredging pipeline due to silt clumping is reduced, so as to save the time spent on cleaning the dredging pipeline, thereby improving the dredging efficiency.

[0009] Optionally, the high-pressure water spraying system comprises a water pipe, a slurry pump and a nozzle, the slurry pump is in communication with the water pipe, and the nozzle is installed on the outer wall of the water pipe, the inner diameter of the nozzle gradually decreases from the position close to the water pipe to the position far away from the water pipe, and the water pipe is installed on the sludge discharge branch pipe.

[0010] By adopting the above technical scheme, when the slurry pump is started, water is delivered to the nozzle through the water pipe, and because the inner diameter of the nozzle gradually decreases from the position close to the water pipe to the position far away from the water pipe, the water has a greater pressure when sprayed from the nozzle, so that the consolidated sludge in the sludge is more quickly dispersed.

[0011] Optionally, the end of the gas lift pipe far away from the air compressor is located in the sludge discharge main pipe, and the end of the gas lift pipe located in the sludge discharge main pipe is provided with an elbow, and the end of the elbow far away from the gas lift pipe blows gas in the sludge discharge main pipe in a direction away from the sludge discharge branch pipe.

[0012] By adopting the above technical scheme, the end of the gas lift pipe located in the sludge discharge main pipe is provided with an elbow, so that when the air compressor is started, air is supplied into the gas lift pipe, and the airflow blows out in the sludge discharge main pipe in a direction away from the sludge discharge branch pipe from the end of the elbow far away from the gas lift pipe, so that the airflow speed in the sludge discharge main pipe is higher than that of the external airflow, thereby generating negative pressure in the sludge discharge main pipe, so that the sludge-water mixture enters the sludge discharge main pipe from the sludge discharge branch pipe under the action of air pressure, and is finally discharged from the sludge discharge main pipe.

[0013] Optionally, a cavity is arranged in the pipe wall of the sludge discharge main pipe, a gas outlet hole in communication with the cavity is arranged on the inner wall of the sludge discharge main pipe, the end of the gas lift pipe far away from the air compressor is in communication with the cavity, a flow guide plate is arranged outside the gas outlet hole, one end of the flow guide plate is connected to the inner wall of the sludge discharge main pipe, and the distance between the other end of the flow guide plate and the inner wall of the sludge discharge main pipe gradually increases from the position close to the sludge discharge branch pipe to the position far away from the sludge discharge branch pipe.

[0014] By adopting the above technical scheme, a cavity is arranged in the pipe wall of the sludge discharge main pipe, a gas outlet hole in communication with the cavity is arranged on the inner wall of the sludge discharge main pipe, and a flow guide plate is further arranged at the gas outlet hole, the distance between the flow guide plate and the inner wall of the sludge discharge main pipe gradually increases from the position close to the sludge discharge branch pipe to the position far away from the sludge discharge branch pipe, and the end of the gas lift pipe far away from the air compressor is in communication with the cavity, so that when the air compressor is working, the generated airflow enters the cavity through the gas lift pipe and is finally blown out through the gas outlet hole, the flow guide plate makes the airflow blow in the sludge discharge main pipe in a direction away from the sludge discharge branch pipe, thereby forming negative pressure in the sludge discharge main pipe, so that the sludge-water mixture enters the sludge discharge main pipe from the sludge discharge branch pipe under the action of atmospheric pressure, and is finally discharged from the sludge discharge main pipe.

[0015] Optionally, the guide plate is hinged to the inner wall of the main sludge discharge pipe, and a supporting plate is arranged below the guide plate and fixedly connected to the inner wall of the main sludge discharge pipe, and the supporting plate is used to limit the rotation angle of the guide plate.

[0016] By adopting the above technical scheme, the guide plate is hinged to the main sludge discharge pipe, and a supporting plate is arranged below the guide plate and fixedly connected to the inner wall of the main sludge discharge pipe, and the supporting plate is used to limit the rotation angle of the guide plate.

[0017] Optionally, the gas outlet hole is provided in multiple groups, and the multiple groups of gas outlet holes are axially spaced apart along the main sludge discharge pipe; each group of gas outlet holes is provided with multiple gas outlet holes, and the multiple gas outlet holes are uniformly arranged on the inner wall of the main sludge discharge pipe in the circumferential direction.

[0018] By adopting the above technical scheme, a negative pressure is formed every interval distance in the main sludge discharge pipe, so that the sludge-water mixture discharged through the sludge discharge branch pipe continuously rises in the main sludge discharge pipe after entering the main sludge discharge pipe, and is continuously subjected to the negative pressure generated by the multiple groups of gas outlet holes, so that the sludge-water mixture can be periodically maintained at a discharge speed in the main sludge discharge pipe, and the discharge speed of the sludge-water mixture in the main sludge discharge pipe will not continuously decrease away from the negative pressure generating position.

[0019] Optionally, a plurality of slurry passing holes are arranged on the supporting plate, the slurry passing holes are uniformly distributed on the supporting plate, and each slurry passing hole faces the guide plate.

[0020] By adopting the above technical scheme, the slurry passing holes are arranged on the supporting plate, so that when the height of the slurry-water mixture in the main sludge discharge pipe is at the height of the supporting plate, the slurry-water mixture can abut against the guide plate, which makes the slurry-water mixture push the guide plate to rotate in the direction of the gas outlet hole before the slurry-water mixture reaches the height of the gas outlet hole, and the guide plate no longer abuts against the supporting plate, which reduces the angle of the guide plate and adjusts the gas outlet direction of the gas outlet hole, and further reduces the probability of the slurry-water mixture entering the cavity.

[0021] Optionally, two baffle plates and one air passage plate are arranged at the edge of the guide plate, the two baffle plates are installed on the side of the guide plate away from the supporting plate and are parallel to each other, the air passage plate is installed at the end of the guide plate away from the hinge shaft and is connected to the two baffle plates respectively, the air passage plate and the baffle plates can abut against the inner wall of the main sludge discharge pipe after the guide plate rotates around the hinge shaft to form a closed space, a plurality of air holes are arranged on the air passage plate, and the diameters of the air holes gradually decrease from the direction close to the hinge shaft on the guide plate to the direction away from the hinge shaft on the guide plate.

[0022] By adopting the technical scheme, when the sludge-water mixture enters the sludge discharge main pipe from the sludge discharge branch pipe and is then discharged from the sludge discharge main pipe, the sludge-water mixture makes the guide plate rotate on the supporting plate around the hinge shaft towards the direction close to the air outlet hole, and as the pressure of the sludge-water mixture on the guide plate gradually increases, the air passage plate and the baffle plate on the guide plate abut against the inner wall of the sludge discharge main pipe, thereby forming a closed space, which makes the airflow be discharged through the air passage holes on the air passage plate, and under the premise that the airflow is constant, as the diameter of the air passage holes gradually decreases from the direction close to the hinge shaft on the guide plate to the direction away from the hinge shaft on the guide plate, the airflow is discharged through the air passage holes at a faster speed, thereby generating a greater negative pressure in the sludge discharge main pipe, and the sludge-water mixture can be discharged from the sludge discharge main pipe more quickly.

[0023] In a second aspect, the application further provides a sludge discharge method for a large-diameter steel pipe pile, which adopts a sludge discharge device for a large-diameter steel pipe pile provided by the application, and comprises the following steps:

[0024] S100: Hoist the sludge discharge pipeline and lower it close to the inner wall of the large-diameter steel pipe pile until the end of the sludge discharge branch pipe away from the sludge discharge main pipe is located at H1 above the sludge surface in the large-diameter steel pipe pile;

[0025] S200: Start the slurry pump and the air compressor respectively, spray high-pressure water at the nozzle to flush the sludge surface, and generate a negative pressure in the sludge discharge main pipe to discharge the sludge-water mixture through the sludge discharge branch pipe and the sludge discharge main pipe;

[0026] S300: Observe the sludge-water mixture discharged from the sludge discharge main pipe, and if the turbidity of the sludge-water mixture decreases, lower the sludge discharge pipeline again by H2m;

[0027] S400: Move the sludge discharge pipeline to start circumferential movement around the axis of the large-diameter steel pipe pile in the large-diameter steel pipe pile and repeat step S200 in the process of movement, and the diameter of the movement track of the sludge discharge pipeline in the large-diameter steel pipe pile becomes smaller and smaller, until the sludge discharge pipeline is located at the center position of the large-diameter steel pipe pile to repeat step S200.

[0028] In summary, the application has at least the following beneficial technical effects:

[0029] 1. By generating a negative pressure in the sludge discharge main pipe and using a high-pressure water spraying system, the sludge surface in the steel pipe pile is flushed, thereby reducing the probability of the sludge in the sludge discharge branch pipe being caked, enabling the sludge to smoothly enter the sludge discharge main pipe through the sludge discharge branch pipe and be finally discharged through the sludge discharge main pipe, reducing the risk of the sludge caking causing the sludge discharge pipeline to be blocked, thereby saving the time required for cleaning the sludge discharge pipeline, and achieving improved sludge discharge efficiency in the steel pipe pile;

[0030] 2. By gradually reducing the inner diameter of the nozzle from the direction close to the water pipe to the direction away from the water pipe, the water body is sprayed out of the nozzle with greater pressure, thereby achieving the effect of more quickly dispersing the consolidated mud blocks in the sludge. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 is a perspective view of a large-diameter steel pipe pile sludge discharge device in Embodiment 1 of the present application;

[0032] Figure 2 is a sectional view of Figure 1

[0033] Figure 3 is a perspective view of a large-diameter steel pipe pile sludge discharge device in Embodiment 3 of the present application;

[0034] Figure 4 is a sectional view of the sludge discharge main pipe portion in Figure 3

[0035] Figure 5 is an enlarged view of A in Figure 4

[0036] Reference signs: 1, sludge discharge pipe; 2, high-pressure gas lifting system; 3, sludge discharge main pipe; 4, sludge discharge branch pipe; 5, air compressor; 6, gas lifting pipe; 7, high-pressure water spraying system; 8, water pipe; 9, slurry pump; 10, nozzle; 11, elbow; 12, cavity; 13, air outlet hole; 14, guide plate; 15, supporting plate; 16, slurry outlet hole; 17, air vent plate; 18, baffle; 19, air vent hole. DETAILED DESCRIPTION

[0037] The present application will be further described below in conjunction with the accompanying drawings. Figures 1-5

[0038] Embodiment 1:

[0039] Embodiment 1 of the present application discloses a large-diameter steel pipe pile sludge discharge device, referring to Figures 1-2 ​​​​, including the sludge discharge pipeline 1, and the high-pressure gas lift system 2 and the high-pressure water jet system 7 respectively installed on the sludge discharge pipeline 1, wherein the sludge discharge pipeline 1 comprises a vertically placed sludge discharge main pipe 3, and a sludge discharge branch pipe 4 in communication with the sludge discharge main pipe 3 is arranged below the sludge discharge main pipe 3; the high-pressure gas lift system 2 comprises an air compressor 5 and a gas lift pipe 6 connected with the air compressor 5, the end of the gas lift pipe 6 away from the air compressor 5 is installed inside the sludge discharge main pipe 3, and an upward elbow 11 is arranged on the part of the gas lift pipe 6 located inside the sludge discharge main pipe 3, which makes the airflow generated by the air compressor 5 enter the inside of the sludge discharge main pipe 3 through the gas lift pipe 6 and be sprayed out from the elbow 11 when the air compressor 5 is started, and since the elbow 11 is upward, the airflow sprayed out from the elbow 11 blows to the upper end of the sludge discharge main pipe 3 inside the sludge discharge main pipe 3, which makes the gas flow rate inside the sludge discharge main pipe 3 greater than that outside, so as to form a negative pressure inside the sludge discharge main pipe 3, so as to facilitate the extraction of the sludge when the end of the sludge discharge branch pipe 4 is close to the sludge, and then the sludge is discharged through the sludge discharge main pipe 3.

[0040] The high-pressure water jet system 7 comprises a water pipe circuit 8, a slurry pump 9 and a nozzle 10, the water pipe circuit 8 is fixedly connected with the outer wall of the sludge discharge branch pipe 4, the slurry pump 9 is in communication with the water pipe circuit 8, the slurry pump 9 is used for conveying water to the water pipe circuit 8, and the nozzle 10 is uniformly distributed on the bottom of the water pipe circuit 8, the nozzle 10 sprays water towards the lower part of the sludge discharge branch pipe 4, and the inner diameter of the nozzle 10 used for spraying water gradually decreases from the direction close to the water pipe circuit 8 to the direction away from the water pipe circuit 8, which makes the water pressure sprayed out through the nozzle 10 greater, so as to more quickly disperse the clumps in the sludge, thereby reducing the probability of the blockage of the sludge discharge branch pipe 4 and the sludge discharge main pipe 3 when discharging the sludge.

[0041] The implementation principle of the embodiment 1 of the present application is that the sludge discharge pipeline 1 is first placed downward from the upper end of the large-diameter steel pipe pile until the distance between the bottom of the sludge discharge branch pipe 4 and the sludge surface in the large-diameter steel pipe pile is between 20cm and 30cm, then the slurry pump 9 and the air compressor 5 are started respectively, at this time, water flows from the high-pressure pump to the water pipe circuit 8 and is finally sprayed out through the nozzle 10, the water sprayed out then washes the sludge surface, and then the air compressor 5 is started, the gas lift pipe 6 blows gas in the sludge discharge main pipe 3 towards the end of the sludge discharge main pipe 3 away from the sludge discharge branch pipe 4, so as to generate a negative pressure in the sludge discharge main pipe 3, then the sludge discharge main pipe 3 and the sludge discharge branch pipe 4 are continuously placed down, the sludge-water mixture enters the sludge discharge main pipe 3 through the sludge discharge branch pipe 4 under the action of the negative pressure and is finally discharged through the sludge discharge main pipe 3, then the sludge discharge main pipe 3 and the sludge discharge branch pipe 4 are moved in the large-diameter steel pipe pile until the sludge at the current height is completely cleaned.

[0042] Embodiment 2:

[0043] The embodiment 2 of the present application provides a large-diameter steel pipe pile sludge discharge method, adopts the large-diameter steel pipe sludge discharge device provided in the above embodiment 1, and comprises the following steps.

[0044] S100: hoist the sludge discharge pipeline 1 and lower the sludge discharge pipeline 1 close to the inner wall of the large-diameter steel pipe pile until the one end of the sludge discharge branch pipe 4 away from the sludge discharge main pipe 3 is located at H1 cm above the mud surface in the large-diameter steel pipe pile;

[0045] S200: start the slurry pump 9 and the air compressor 5 respectively, the nozzle 10 sprays high-pressure water to flush the mud surface, and the negative pressure generated in the sludge discharge main pipe 3 discharges the mud-water mixture through the sludge discharge branch pipe 4 and the sludge discharge main pipe 3;

[0046] S300: observe the mud-water mixture discharged from the sludge discharge main pipe 3, if the turbidity degree of the mud-water mixture is reduced, then lower the sludge discharge pipeline 1 by H2 m again;

[0047] S400: move the sludge discharge pipeline 1 to start circumferential movement around the axis of the large-diameter steel pipe pile in the large-diameter steel pipe pile and repeat the step S200 in the process of movement, so as to reciprocate, and the diameter of the movement track of the sludge discharge pipeline 1 in the large-diameter steel pipe pile is smaller and smaller, until the sludge discharge pipeline is located at the center position of the large-diameter steel pipe pile to repeat the step S200.

[0048] In the above step S200, when the turbidity degree in the mud-water mixture is reduced, it indicates that the proportion of silt in the mud-water mixture discharged by the sludge discharge pipeline is reduced.

[0049] In the step S400, the sludge discharge pipeline starts to move around the axis of the steel pipe pile to discharge sludge, and the diameter of the movement track of the sludge discharge pipeline in the steel pipe pile is smaller and smaller, so that the sludge discharge pipeline gradually approaches the axis of the steel pipe pile in the process of movement, finally, the sludge discharge pipeline moves to the central axis of the steel pipe pile to discharge sludge, which enables the sludge discharge pipeline to more comprehensively discharge the silt in the steel pipe pile and less missed.

[0050] The value range of the above H1 cm is between 20-30 cm, and the value range of the above H2 m is between 0.3-0.6 m.

[0051] Embodiment 3:

[0052] The difference between the embodiment 3 and the embodiment 1 of the present application lies in the structure for generating negative pressure in the sludge discharge main pipe 3.

[0053] Reference Figures 3-5A cavity 12 is arranged inside the wall of the main sludge discharge pipe 3, and the end of the gas lift pipe 6 away from the air compressor 5 is communicated with the cavity 12. A gas outlet hole 13 is arranged on the inner wall of the main sludge discharge pipe 3 corresponding to the position of the cavity 12. A flow guide plate 14 is arranged on the main sludge discharge pipe 3 corresponding to the position of the gas outlet hole 13. One end of the flow guide plate 14 is hinged to the inner wall of the main sludge discharge pipe 3 below the gas outlet hole 13. The distance between the end of the flow guide plate 14 away from the hinge shaft and the inner wall of the main sludge discharge pipe 3 gradually increases from the direction close to the hinge shaft to the direction away from the hinge shaft. Therefore, when the gas flow sprayed from the gas lift pipe 6 is sprayed out through the gas outlet hole 13 after passing through the cavity 12, the gas flow will flow in the main sludge discharge pipe 3 away from the sludge branch pipe 4 due to the effect of the flow guide plate 14, and then a negative pressure is formed in the main sludge discharge pipe 3.

[0054] The gas outlet hole 13 is arranged in multiple groups, and the multiple groups of gas outlet holes are arranged at intervals in the axial direction of the main sludge discharge pipe 3. Each group of gas outlet holes 13 is arranged with multiple gas outlet holes 13, and the multiple gas outlet holes 13 are arranged at the same height on the inner wall of the main sludge discharge pipe 3 in a circumferential direction. This makes a negative pressure formed in the main sludge discharge pipe 3 at every interval, so that the sludge-water mixture discharged through the sludge branch pipe 4 continuously rises after entering the main sludge discharge pipe 3 and is continuously subjected to the negative pressure generated by the multiple groups of gas outlet holes 13, so that the sludge-water mixture can maintain a discharge speed in stages in the main sludge discharge pipe 3, and the discharge speed of the sludge-water mixture in the main sludge discharge pipe 3 does not continuously decrease away from the negative pressure generating position.

[0055] Further, a supporting plate 15 is arranged below each flow guide plate 14. The supporting plate 15 is fixedly connected with the inner wall of the main sludge discharge pipe 3 and is parallel to the flow guide plate 14. The supporting plate 15 limits and supports the flow guide plate 14, so that the rotation range of the flow guide plate 14 around the hinge shaft is limited to ensure that the flow guide plate 14 can guide the gas sprayed from the gas outlet hole 13.

[0056] The support plate 15 is provided with a plurality of slurry passing holes 16, and the flow guide plate 14 is provided with two baffle plates 18 and a ventilation plate 17 on the side away from the support plate 15. The two baffle plates 18 are respectively installed on the two sides of the flow guide plate 14 in the direction of the extent, and the ventilation plate 17 is installed on the end of the flow guide plate 14 away from the hinge shaft. The two baffle plates 18 are respectively connected to the ventilation plate 17. The ventilation plate 17 is provided with a ventilation hole 19 with an axis parallel to the flow guide plate, and the diameter of the ventilation hole 19 gradually decreases from the hinge shaft of the flow guide plate 14 to the direction away from the hinge shaft. When the slurry mixture rises to the position of the support plate 15 in the sludge main pipe 3, part of the slurry mixture will contact the bottom surface of the flow guide plate 14 through the slurry passing holes 16 on the support plate 15, thereby pushing the flow guide plate 14 to rotate around the hinge shaft in the direction of the air outlet hole 13. With the continuous increase of the slurry mixture, the flow guide plate 14 is continuously pushed to rotate until the two baffle plates 18 and the ventilation plate 17 are tightly abutted with the inner wall of the sludge main pipe 3. At this time, the airflow in the cavity 12 can be discharged only after passing through the air outlet hole 13 and then passing through the ventilation hole 19. The air outlet direction of the ventilation hole 19 is more close to parallel to the length direction of the sludge main pipe 3.

[0057] Because the diameter of the ventilation hole 19 gradually decreases from the hinge shaft of the flow guide plate 14 to the direction away from the hinge shaft, the airflow discharged through the ventilation hole 19 has a faster flow rate, thereby being able to generate a stronger negative pressure to ensure the discharge efficiency of the slurry mixture.

[0058] The above are preferred embodiments of the present application, which do not limit the protection scope of the present application. Any equivalent changes made on the basis of the structure, shape, and principle of the present application should be covered by the protection scope of the present application.

Claims

1. A sludge removal device for large-diameter steel pipe piles, characterized in that: The system includes a sludge discharge pipeline (1), a high-pressure air lift system (2), and a high-pressure water spray system (7). The sludge discharge pipeline (1) includes a main sludge discharge pipe (3) and multiple sludge discharge branch pipes (4). The multiple sludge discharge branch pipes (4) are located below the main sludge discharge pipe (3) and are connected to the main sludge discharge pipe (3) respectively. The high-pressure air lift system (2) includes an air compressor (5) and an air lift pipe (6) connected to the air compressor (5). The end of the air lift pipe (6) away from the air compressor (5) is connected to the main sludge discharge pipe (3). The air lift pipe (6) is used to create negative pressure in the main sludge discharge pipe (3). The high-pressure water spray system (7) is used to spray water onto the end of the sludge discharge branch pipe (4) away from the main sludge discharge pipe (3). The high-pressure water spraying system (7) includes a water pipe (8), a slurry pump (9), and a nozzle (10). The slurry pump (9) is connected to the water pipe (8). The nozzle (10) is installed on the water pipe (8) and is used to spray water onto the end of the sludge discharge branch pipe (4) away from the sludge discharge main pipe (3). The inner diameter of the nozzle (10) gradually decreases from the direction close to the water pipe (8) to the direction away from the water pipe (8). The water pipe (8) is fixed on the sludge discharge branch pipe (4). A cavity (12) is provided inside the wall of the sludge discharge main pipe (3). An air outlet (13) communicating with the cavity (12) is provided on the inner wall of the sludge discharge main pipe (3). The air lift pipe (6) is connected to the cavity (12) at one end away from the air compressor (5). A guide plate (14) is provided outside the air outlet (13). One end of the guide plate (14) is connected to the inner wall of the sludge discharge main pipe (3). The distance between the other end of the guide plate (14) and the inner wall of the sludge discharge main pipe (3) gradually increases from the direction close to the sludge discharge branch pipe (4) to the direction away from the sludge discharge branch pipe (4). The guide plate (14) is hinged to the inner wall of the sludge discharge main pipe (3). A support plate (15) is provided below the guide plate (14). The support plate (15) is fixedly connected to the inner wall of the sludge discharge main pipe (3). The support plate (15) is used to restrict the flow. The rotation angle of the plate (14); two baffles (18) and a vent plate (17) are provided at the edge of the guide plate (14). The two baffles (18) are installed on the side of the guide plate (14) away from the support plate (15) and are parallel to each other. The vent plate (17) is installed on the end of the guide plate (14) away from the hinge axis and is connected to the two baffles (18) respectively. The vent plate (17) and the baffles (18) can form a closed space by abutting against the inner wall of the sludge discharge main pipe (3) after the guide plate (14) rotates around the hinge axis. The vent plate (17) is provided with a plurality of vent holes (19). The diameter of the vent holes (19) gradually decreases in the direction of air outlet.

2. The sludge removal equipment for large-diameter steel pipe piles according to claim 1, characterized in that: The end of the air lift pipe (6) away from the air compressor (5) is located inside the sludge discharge main pipe (3). An elbow (11) is provided at the end of the air lift pipe (6) located in the sludge discharge main pipe (3). The elbow (11) blows air in the sludge discharge main pipe (3) in a direction away from the sludge discharge branch pipe (4).

3. The sludge removal equipment for large-diameter steel pipe piles according to claim 1, characterized in that: The air outlet (13) is provided in multiple sets, and the multiple sets of air outlet (13) are arranged at intervals along the axial direction of the sludge discharge main pipe (3); each set of air outlet (13) is provided with multiple air outlets, and the multiple air outlets (13) are evenly distributed circumferentially on the inner wall of the sludge discharge main pipe (3).

4. The sludge removal equipment for large-diameter steel pipe piles according to claim 1, characterized in that: The support plate (15) is provided with a plurality of slurry passage holes (16), which are evenly distributed on the support plate (15) and each of the slurry passage holes (16) faces the guide plate (14).

5. A method for removing sludge from large-diameter steel pipe piles, employing the sludge removal equipment for large-diameter steel pipe piles as described in any one of claims 1-4, characterized in that: Includes the following steps: S100: Lift up the sludge discharge pipe (1) and lower it close to the inner wall of the large-diameter steel pipe pile until the end of the sludge discharge branch pipe (4) away from the sludge discharge main pipe (3) is located at H1 above the mud surface inside the large-diameter steel pipe pile. S200: Start the slurry pump (9) and the air compressor (5) respectively. High-pressure water is sprayed from the nozzle (10) to flush the mud surface inside the large-diameter steel pipe pile. At the same time, negative pressure is generated in the mud discharge main pipe (3) to discharge the mud-water mixture through the mud discharge branch pipe (4) and the mud discharge main pipe (3). S300: Observe the mud-water mixture discharged from the mud discharge main pipe (3). If the turbidity of the mud-water mixture decreases, lower the mud discharge pipe (1) down by H2m again. S400: Move the sludge discharge pipe (1) around the axis of the large-diameter steel pipe pile in a circular motion and repeat step S200 during the movement. Repeat this process, and the diameter of the sludge discharge pipe (1) moving trajectory in the large-diameter steel pipe pile becomes smaller and smaller until the sludge discharge pipe (1) is located at the center of the large-diameter steel pipe pile. Repeat step S200.

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