Self-service wall protection device and wall protection method for bored piles

Abstract

The present application relates to a self-service wall protection device and a wall protection method for bored piles, which comprises a vertically arranged hollow drill rod, a drill bit connected to the bottom end of the drill rod, a plurality of mud spraying pipes arranged in the drill bit, the plurality of mud spraying pipes arranged circumferentially around the axis of the drill bit, one end of the mud spraying pipe is connected to the circumferential outer wall of the drill bit, and the other end extends into the drill rod, a mud pump is arranged on the ground, the outlet end of the mud pump is connected to a mud delivery hose, the end of the mud delivery hose away from the mud pump extends from the top of the drill rod into the drill rod, and the mud delivery hose and the mud spraying pipe are connected and rotatably connected. The present application has the advantage of reducing the possibility of collapse of the hole during drilling.

Description

Technical Field

[0001] The present application relates to the field of bored piles, and in particular to a self-service wall protection device and a wall protection method for bored piles. Background Art

[0002] Bored cast-in-place piles refer to piles made by forming pile holes in the foundation soil at the construction site through mechanical drilling, steel pipe squeezing or manual excavation, placing a steel cage inside and pouring concrete.

[0003] However, since the soil at some construction sites is relatively loose, the holes formed by drilling are prone to collapse. Therefore, construction workers usually put wall retaining structures into the drilled holes after the drilling is completed to reduce the possibility of hole collapse.

[0004] With respect to the above-mentioned related technologies, the inventor believes that the above-mentioned wall protection structure is placed in the hole after the drilling is completed, so it can only protect the hole after the drilling is completed. However, during the drilling process, the hole may also collapse, so it cannot protect the hole during the drilling process, which is obviously insufficient. Summary of the invention

[0005] In order to improve the problem of hole collapse that may occur during drilling, the present application provides a self-service wall protection device and a wall protection method for bored piles.

[0006] The present application provides a self-service wall protection device and wall protection method for bored piles, which adopts the following technical solutions:

[0007] A self-service wall protection device for bored piles comprises a vertically arranged drill rod with a hollow interior, a drill bit being connected to the bottom end of the drill rod, a plurality of mud spraying pipes being arranged in the drill bit, the plurality of mud spraying pipes being circumferentially arranged around the axis of the drill bit, one end of the mud spraying pipe being communicated with the circumferential outer wall of the drill bit, and the other end extending into the drill rod, a mud pump being arranged on the ground, a mud delivery hose being connected to the outlet end of the mud pump, an end of the mud delivery hose away from the mud pump extending from the top of the drill rod into the drill rod, and the mud delivery hose and the mud spraying pipe being communicated and rotatably connected.

[0008] By adopting the above technical solution, the drill rod drives the drill bit to rotate and continuously move downward to achieve drilling. During the drilling process, the mud pump is in working state, and the mud pump draws the pre-made artificial mud into the mud delivery hose, and then sprays it onto the drilled hole wall through the mud spraying pipe. The mud quickly dries and solidifies to form a protective wall, thereby reducing the possibility of hole collapse during the drilling process.

[0009] Optionally, an adapter is provided between the mud delivery hose and the plurality of mud spraying pipes, the adapter comprises a rotating disk fixedly sleeved on one end of the plurality of mud spraying pipes located in the drill rod, a fixed disk is connected to and tightly attached to the side of the rotating disk facing away from the drill bit, an accommodating cavity is opened on the side of the fixed disk facing the rotating disk, a flange plate which is rotatably connected to the accommodating cavity and is respectively communicated with the plurality of mud spraying pipes, a mounting sleeve is connected to the side of the flange plate which is away from the rotating disk, and the mounting sleeve rotates through the fixed disk and is communicated with the mud delivery hose.

[0010] By adopting the above technical solution, the drill rod drives the drill bit to rotate, and the drill bit rotates through the rotating disk and the fixed disk, and the installation casing is connected to the mud pump through one end so that the flange plate remains stationary in the accommodating cavity, thereby realizing the rotation coordination of the mud spraying pipe and the mud delivery hose.

[0011] Optionally, a control valve 1 is provided between the mud delivery hose and the mud pump, an inflation pipe is connected to the mud delivery hose between the control valve 1 and the mud spraying pipe, a control valve 2 is provided on the inflation pipe, and an end of the inflation pipe away from the mud delivery hose is connected to the inflation pump.

[0012] By adopting the above technical solution, when the drill bit is lifted after drilling to the deepest point, control valve one is closed, control valve two is opened and the air pump is started, the air pump draws outside air into the air pipe, the air in the air pipe enters the mud hose, the air pushes the mud remaining in the mud hose and the mud spraying pipe to spray out, the remaining mud is sprayed onto the mud protective wall that has been solidified, and the secondary spraying is realized, which further reinforces the already formed mud protective wall. After the mud in the mud hose and the mud spraying pipe is sprayed out, the air pump can continuously spray the outside cold air onto the mud protective wall through the mud hose and the mud spraying pipe, thereby drying the mud protective wall, accelerating the speed of mud solidification, and making the mud protective wall solidify as soon as possible so that it has sufficient strength to support the hole.

[0013] Optionally, a spiral pipe rope is wound on the outer side wall of the mud conveying hose along its length direction, and the pipe rope covers the entire outer side wall of the mud conveying hose and is connected thereto.

[0014] By adopting the above technical solution, the setting of the pipe rope reduces the possibility that the flange plate rotates due to friction, thereby driving the mud conveying hose to rotate and become tangled, resulting in blockage.

[0015] Optionally, a gap is formed between the pipe rope and the inner wall of the drill pipe, and a wear-resistant layer is coated on the pipe rope.

[0016] By adopting the above technical solution, the wear-resistant layer protects the pipe rope, reducing the possibility of the pipe rope being worn due to collision with the inner wall of the drill rod when the drill rod rotates.

[0017] Optionally, a three-way pipe is provided between the control valve 1 and the mud delivery hose, the three-way pipe includes inlet 1, inlet 2, and an outlet, the mud delivery hose is connected to the outlet, the control valve 1 is connected to inlet 1, the inlet 2 is connected to a water inlet pipe, the water inlet pipe is provided with a control valve 3, and the water inlet pipe is connected to a water pump.

[0018] By adopting the above technical solution, after the drilling is completed, control valve one and control valve two are closed, control valve three is opened, and the water pump is started. The water pump draws clean water into the mud delivery hose through the water inlet pipe. The clean water clears the mud in the mud delivery hose and the mud spraying pipe, and the mud water formed by cleaning is discharged through the mud spraying pipe.

[0019] Optionally, the diameter of the mud spraying pipe gradually decreases in the direction away from the axis of the drill bit.

[0020] By adopting the above technical solution, the diameter gradually becomes smaller, so that the mud is sprayed out from the mud spraying pipe more powerfully, thereby improving the adhesion effect of the mud to the hole wall.

[0021] A wall protection method of a self-service wall protection device for bored piles, the steps of which are as follows:

[0022] S1. Mud preparation: dig a mud pool, prepare mud manually, arrange a mud pump next to the mud pool, and connect the water inlet pipe to the water source;

[0023] S2. Wall making: When drilling, close control valve 2 and control valve 3, open control valve 1, start the mud pump, and the mud pump draws the mud in the mud pool into the mud delivery hose. The mud in the mud delivery hose enters several mud spraying pipes and sprays out onto the side walls of the drilled hole. The mud quickly dries and solidifies to form a protective wall.

[0024] S3, Pipe cleaning: When the drill bit drills to a sufficient depth, lift the drill bit, close control valve 1 and control valve 3, open control valve 2, start the air pump, and the air pump draws external air into the air pipe. The air in the air pipe enters the mud delivery hose, and the air pushes the remaining mud in the mud delivery hose and the mud spraying pipe to spray onto the formed mud protective wall; when the mud in the mud delivery hose and the mud spraying pipe is completely sprayed out, the air in the mud delivery hose is sprayed from the mud spraying pipe onto the protective wall;

[0025] S4. Cleaning: After the drill bit is removed from the hole, close control valve 1 and control valve 2, open control valve 3, start the water pump, and the water pump draws clean water into the mud hose through the water inlet pipe. The clean water flushes the mud remaining in the mud hose and the mud spraying pipe, and the mud water formed by cleaning is discharged from the mud spraying pipe.

[0026] By adopting the above technical solution, while drilling, the mud pump draws the pre-prepared mud into the mud hose, and then sprays it onto the drilled hole wall through the mud spraying pipe. The mud quickly dries and solidifies to form a protective wall, thereby reducing the possibility of hole collapse during the drilling process. An air pump is set to spray out the residual mud in the mud hose and the mud spraying pipe, realizing secondary spraying, thereby achieving the purpose of reinforcement. Finally, clean water is pumped into the mud hose through the water pump to clean the mud hose and the mud spraying pipe.

[0027] In summary, the present application includes at least one of the following beneficial technical effects:

[0028] 1. During the drilling process, the mud pump is in working condition. The mud pump draws the pre-made artificial mud into the mud delivery hose, and then sprays it onto the drilled hole wall through the mud spraying pipe. The mud quickly dries and solidifies to form a protective wall, thereby reducing the possibility of hole collapse during the drilling process;

[0029] 2. When the drill bit is lifted after drilling to the deepest point, close control valve 1, open control valve 2 and start the air pump. The air pump draws outside air into the air pipe. The air in the air pipe enters the mud hose. The air pushes the residual mud in the mud hose and the mud spraying pipe to spray out. The residual mud is sprayed onto the solidified mud wall, achieving secondary spraying and further reinforcing the already formed mud wall. After the mud in the mud hose and the mud spraying pipe is sprayed out, the air pump can continuously spray outside cold air onto the mud wall through the mud hose and the mud spraying pipe, thereby drying the mud wall and accelerating the solidification speed of the mud, so that the mud wall solidifies as soon as possible and has sufficient strength to support the hole;

[0030] 3. The setting of the pipe rope reduces the possibility that the flange will rotate due to friction, thereby driving the mud hose to rotate and become tangled, resulting in blockage;

[0031] 4. After drilling, start the water pump, which pumps clean water into the mud hose through the water inlet pipe. The clean water clears the mud in the mud hose and the mud spraying pipe, thereby reducing the possibility of mud solidifying and forming in the mud hose and the spraying pipe and causing blockage. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the structure used to embody the present application;

[0033] Figure 2 It is a cross-sectional view used to embody the mud spraying pipe in this application;

[0034] Figure 3 It is a schematic diagram of the structure of the water pump used in this application.

[0035] Explanation of the reference numerals: 10, drill rod; 11, drill bit; 20, mud spraying pipe; 21, mud pump; 22, mud delivery hose; 23, control valve one; 240, rotating disk; 241, fixed disk; 242, flange; 243, accommodating chamber; 244, mounting sleeve; 30, air pump; 31, air pipe; 32, control valve two; 4, pipe rope; 50, water pump; 51, water inlet pipe; 52, control valve three; 530, inlet one; 531, inlet two; 532, outlet. DETAILED DESCRIPTION

[0036] The following is combined with Figure 1-3 This application is described in further detail.

[0037] The embodiment of the present application discloses a self-service wall protection device and a wall protection method for bored cast-in-place piles.

[0038] Reference Figure 1 The self-service wall protection device of bored piles includes a drilling device, a mud conveying device, an aerating device and a cleaning device.

[0039] Reference Figure 1 and Figure 2 The drilling device includes a drill rod 10 and a drill bit 11. The drill rod 10 is vertically arranged and hollow inside. The drill bit 11 is fixedly connected to the bottom end of the drill rod 10. The drill bit 11 and the drill rod 10 are coaxially arranged, and the bottom of the drill bit 11 is conical.

[0040] Reference Figure 1 and Figure 2 The mud delivery device includes a mud spraying pipe 20, a mud delivery hose 22, a mud pump 21, an adapter, and a control valve 23; a plurality of mud spraying pipes 20 are integrally formed in the drill bit 11, and the plurality of mud spraying pipes 20 are evenly arranged around the axis of the drill bit 11. The mud spraying pipe 20 is arranged in an "L" shape, one end of the mud spraying pipe 20 is connected to the outer circumferential wall of the drill bit 11, and the other end passes through the upper surface of the drill bit 11 and extends into the drill rod 10.

[0041] Reference Figure 1 and Figure 2 The mud pump 21 is set on the ground, and the outlet 532 end of the mud pump 21 is connected to the mud delivery hose 22. The end of the mud delivery hose 22 away from the mud pump 21 extends from the top of the drill rod 10 to the inside of the drill rod 10. The end of the mud delivery pipe located in the drill rod 10 is respectively connected to the ends of several mud spraying pipes 20 located in the drill rod 10.

[0042] Reference Figure 1 and Figure 2 The control valve 23 is arranged between the mud delivery hose 22 and the mud pump 21. When the control valve 23 is in an open state, the mud pump 21 can pump the artificial mud into the mud delivery hose 22.

[0043] Reference Figure 1 and Figure 2 When the drill bit 11 is drilling a hole, the drill bit 11 and the drill rod 10 both rotate, and the mud pump 21 is started. The mud pump 21 draws the prepared artificial mud into the mud delivery hose 22, and then sprays it onto the side wall of the hole through the mud spraying pipe 20. The artificial mud quickly dries and solidifies to form a protective wall, thereby reducing the possibility of hole collapse during drilling.

[0044] Reference Figure 1 and Figure 2 The diameter of the mud spraying pipe 20 gradually decreases along the direction away from the axis of the drill bit 11, so that the artificial mud is sprayed from the mud spraying pipe 20 to the hole wall more powerfully and at a faster speed, which is beneficial to improving the adhesion effect of the artificial mud on the hole wall.

[0045] Reference Figure 1 and Figure 2 Since one end of the mud delivery hose 22 is connected to the mud pump 21, the mud delivery hose 22 cannot rotate when the drill bit 11 is drilling. Therefore, the rotation connection between the mud spraying pipe 20 and the mud delivery hose 22 is achieved through the adapter.

[0046] Reference Figure 2 The adapter is arranged between the mud delivery hose 22 and the plurality of mud spraying pipes 20, and the adapter is arranged in the drill rod 10. The adapter includes a rotating disk 240, a fixed disk 241, a flange 242, and a mounting sleeve 244.

[0047] 2 , the rotating disk 240 is sleeved on a plurality of mud spraying pipes 20 and welded thereto, the fixed disk 241 is located on the side of the rotating disk 240 facing away from the drill bit 11 and is in close contact therewith, the rotating disk 240 and the fixed disk 241 are both horizontally arranged, and the rotating disk 240 and the fixed disk 241 are bolted together.

[0048] 2 , the flange 242 is horizontally arranged in a circular shape, a receiving cavity 243 is opened on the side of the fixed disk 241 facing the rotating disk 240 , the flange 242 is located in the receiving cavity 243 and is rotatably connected thereto, and the flange 242 is communicated with a plurality of mud spraying pipes 20 respectively.

[0049] Reference Figure 2 The installation sleeve 244 is connected to the side of the flange 242 facing away from the rotating disk 240. The installation sleeve 244 rotates through the fixed disk 241 and is connected to the mud conveying hose 22 through a throat clamp.

[0050] Reference Figure 2 When the drill bit 11 drives the mud spraying pipe 20 integrally arranged therewith to rotate, the mud spraying pipe 20 drives the rotating disk 240 and the fixed disk 241 to rotate, and the installation sleeve 244 is connected to one end of the mud pump 21 through the mud delivery hose 22 so that the flange 242 remains relatively still in the accommodating cavity 243.

[0051] Reference Figure 2 A spiral pipe rope 4 is wound along the length direction of the outer wall of the mud delivery hose 22, and the pipe rope 4 covers the entire outer wall of the mud delivery hose 22. The pipe rope 4 is glued to the outer wall of the mud delivery hose 22. The provision of the pipe rope 4 reduces the possibility that the mud delivery hose 22 is tangled due to the rotation of the adapter, resulting in blockage of the mud delivery hose 22.

[0052] Reference Figure 2 The pipe rope 4 and the inner wall of the drill rod 10 are set with a gap. The pipe rope 4 is coated with a wear-resistant layer, which is made of a transparent rubber material. The wear-resistant layer has good wear resistance. The setting of the wear-resistant layer makes it difficult for the pipe rope 4 to be worn even if it collides with the inner wall of the drill rod 10 during drilling.

[0053] Reference Figure 2 and Figure 3 The inflation device includes an inflation pipe 31, a control valve 32, and an inflation pump 30. The inflation pump 30 is arranged on the ground. One end of the inflation pipe 31 is connected to the air outlet end of the inflation pump 30, and the other end is connected to the tube body of the mud delivery hose 22 located between the control valve 23 and the mud spraying pipe 20. The control valve 32 is arranged on the inflation pipe 31.

[0054] Reference Figure 2 and Figure 3 When the drill bit 11 reaches a sufficient depth, the control valve 1 23 is closed. In the process of lifting the drill bit 11, the air pump 30 is turned on, and the air pump 30 draws the outside air into the air pipe 31. The air in the air pipe 31 enters the mud delivery hose 22. The air pushes the residual mud in the mud delivery hose 22 and the mud spraying pipe 20 to spray onto the formed mud protection wall, thereby performing secondary spraying on the formed mud protection wall to achieve reinforcement of the mud protection wall.

[0055] Reference Figure 2 and Figure 3 In addition, after all the mud in the mud delivery hose 22 and the mud spraying pipe 20 is sprayed out, the air pump 30 can continuously deliver the outside cold air into the hole through the mud delivery hose 22 and the mud spraying pipe 20, so as to dry the mud protective wall and increase the air drying speed of the mud protective wall, so that the mud protective wall can have sufficient strength to support the hole as soon as possible.

[0056] Reference Figure 2 and Figure 3 After drilling is completed, a small amount of mud will remain in the mud delivery hose 22 and the mud spraying pipe 20. After the mud is dried, it will form lumps and adhere to the mud delivery hose 22 and the mud spraying pipe 20. After repeated use, the lumpy mud will accumulate more and more and may cause blockage. Therefore, after drilling is completed, the mud remaining in the mud delivery hose 22 and the mud spraying pipe 20 needs to be cleared.

[0057] Reference Figure 2 and Figure 3 The cleaning device includes a three-way pipe, a water inlet pipe 51, a water pump 50, and a control valve 3 52. The three-way pipe is arranged between the control valve 1 23 and the mud delivery hose 22. The three-way pipe includes an inlet 1 530, an inlet 2 531, and an outlet 532. The mud delivery hose 22 is connected to the outlet 532, and the control valve 1 23 is arranged at the inlet 1 530.

[0058] Reference Figure 2 and Figure 3 One end of the water inlet pipe 51 is connected to the inlet 2 531 , and the other end is connected to the water outlet end of the water pump 50 . The control valve 3 52 is set on the water inlet pipe 51 .

[0059] Reference Figure 2 and Figure 3 When the drill bit 11 is moved out of the hole, the control valve 1 23 and the control valve 2 32 are closed, the control valve 3 52 is opened, and the water pump 50 is started. The water pump 50 draws clean water into the mud delivery hose 22 through the water inlet pipe 51. The clean water flushes the small amount of mud remaining in the mud delivery hose 22 and the mud spraying pipe 20, and the mud water formed by cleaning is discharged from the mud spraying pipe 20.

[0060] Reference Figure 2 and Figure 3 The wall protection method of the self-service wall protection device of bored piles has the following wall protection steps: S1, slurry preparation: dig a mud pool, prepare mud manually, arrange a mud pump 21 beside the mud pool, and connect the water inlet pipe 51 with the water source.

[0061] Reference Figure 2 and Figure 3 S2. Wall making: When drilling, close control valve 2 32 and control valve 3 52, open control valve 1 23, start mud pump 21, mud pump 21 draws mud in mud pool into mud hose 22, mud in mud hose 22 enters several mud spraying pipes 20 and sprays out onto the side wall of the drilled hole, mud dries quickly and solidifies to form wall protection.

[0062] Reference Figure 2 and Figure 3 S3, pipe cleaning: when the drill bit 11 drills to a sufficient depth, lift the drill bit 11, close the control valve 1 23 and the control valve 3 52, open the control valve 2 32, start the air pump 30, the air pump 30 draws the outside air into the air pipe 31, the air in the air pipe 31 enters the mud delivery hose 22, the air pushes the mud delivery hose 22 and the mud spraying pipe 20 to spray the remaining mud onto the formed mud protective wall; when the mud in the mud delivery hose 22 and the mud spraying pipe 20 is completely sprayed out, the air in the mud delivery hose 22 is sprayed from the mud spraying pipe 20 onto the protective wall.

[0063] Reference Figure 2 and Figure 3S4, cleaning: when the drill bit 11 is removed from the hole, close the control valve 1 23 and the control valve 2 32, open the control valve 3 52, start the water pump 50, and the water pump 50 pumps clean water into the mud hose 22 through the water inlet pipe 51. The clean water flushes the mud remaining in the mud hose 22 and the mud spraying pipe 20, and the mud water formed by cleaning is discharged from the mud spraying pipe 20.

[0064] The implementation principle of a self-service wall protection device for bored piles in an embodiment of the present application is as follows: construction workers pre-prepare mud on the ground. During the drilling process, control valve 1 23 is opened, control valve 2 32 and control valve 3 52 are closed, and the mud pump 21 is in working condition. The mud pump 21 draws the pre-prepared artificial mud into the mud delivery hose 22, and then sprays it onto the drilled hole wall through the mud spraying pipe 20. The mud quickly dries and solidifies to form a wall protection, thereby reducing the possibility of hole collapse during the drilling process. After the drilling is completed, the control valve 1 23 and the control valve 3 52 are closed, the control valve 2 32 is opened and the air pump 30 is started. During the lifting process of the drill bit 11, the air pump 30 draws the outside air into the air pipe 31, and the air in the air pipe 31 enters the mud hose 22. The air pushes the mud remaining in the mud hose 22 and the mud spraying pipe 20 to spray out, and the remaining mud is sprayed onto the mud protective wall that has been solidified and formed, realizing secondary spraying, which further reinforces the already formed mud protective wall. When the drill bit 11 is moved out of the hole, the control valve 1 23 and the control valve 2 32 are closed, the control valve 3 52 is opened, and the pump 50 is started. The pump 50 draws clean water into the mud hose 22 through the water inlet pipe 51, and the clean water flushes the small amount of mud remaining in the mud hose 22 and the mud spraying pipe 20, and the mud water formed by washing is discharged from the mud spraying pipe 20.

[0065] 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 wall protection method of a self-service wall protection device for bored piles, characterized in that: The autonomous wall protection device of bored piles comprises a drill rod (10) which is arranged vertically and is hollow inside. The bottom end of the drill rod (10) is connected to a drill bit (11). A plurality of mud spraying pipes (20) are arranged inside the drill bit (11). The plurality of mud spraying pipes (20) are arranged circumferentially around the axis of the drill bit (11). One end of the mud spraying pipe (20) is communicated with the circumferential outer wall of the drill bit (11), and the other end extends into the drill rod (10). A mud pump (21) is arranged on the ground. The outlet (532) end of the mud pump (21) is connected to a mud delivery hose (22). The end of the mud delivery hose (22) away from the mud pump (21) extends from the top of the drill rod (10) into the drill rod (10). The mud delivery hose (22) and the mud spraying pipe (20) are communicated and rotatably connected. An adapter is provided between the mud delivery hose (22) and the plurality of mud spraying pipes (20), the adapter comprising a rotating disk (240) fixedly sleeved on one end of the plurality of mud spraying pipes (20) located inside the drill rod (10), the rotating disk (240) having a side facing away from the drill bit (11) connected to a fixed disk (241) and in close contact with the drill bit (11), the fixed disk (241) having a receiving cavity (243) on a side facing the rotating disk (240), the receiving cavity (243) having a flange (242) in communication with the plurality of mud spraying pipes (20) being rotatably connected therein, the flange (242) having a side facing away from the rotating disk (240) connected to a mounting sleeve (244), the mounting sleeve (244) rotatingly passing through the fixed disk (241) and being in communication with the mud delivery hose (22); A control valve 1 (23) is provided between the mud delivery hose (22) and the mud pump (21); an air charging pipe (31) is connected to the mud delivery hose (22) between the control valve 1 (23) and the mud spraying pipe (20); a control valve 2 (32) is provided on the air charging pipe (31); and an end of the air charging pipe (31) away from the mud delivery hose (22) is connected to the air charging pump (30); A spiral pipe rope (4) is wound on the outer wall of the mud conveying hose (22) along its length direction, and the pipe rope (4) covers the entire outer wall of the mud conveying hose (22) and is connected thereto; The pipe rope (4) is provided with a gap between itself and the inner wall of the drill rod (10), and the pipe rope (4) is coated with a wear-resistant layer; A three-way pipe is provided between the control valve 1 (23) and the mud delivery hose (22), the three-way pipe comprising an inlet 1 (530), an inlet 2 (531), and an outlet (532), the mud delivery hose (22) is in communication with the outlet (532), the control valve 1 (23) is in communication with the inlet 1 (530), the inlet 2 (531) is in communication with a water inlet pipe (51), the water inlet pipe (51) is provided with a control valve 3 (52), and the water inlet pipe (51) is in communication with a water pump (50); The diameter of the mud spraying pipe (20) gradually decreases in a direction away from the axis of the drill bit (11); The wall protection method of the bored pile autonomous wall protection device comprises the following steps: S1, slurry preparation: digging a mud pool, artificially preparing mud, arranging a mud pump (21) beside the mud pool, and connecting the water inlet pipe (51) to the water source; S2, wall making: when drilling, close the control valve 2 (32) and the control valve 3 (52), open the control valve 1 (23), start the mud pump (21), the mud pump (21) pumps the mud in the mud pool into the mud delivery hose (22), the mud in the mud delivery hose (22) enters a plurality of mud spraying pipes (20) and is sprayed onto the side wall of the drilled hole, and the mud is quickly air-dried and solidified to form a protective wall; S3, pipe cleaning: when the drill bit (11) drills to a sufficient depth, the drill bit (11) is lifted, the control valve 1 (23) and the control valve 3 (52) are closed, the control valve 2 (32) is opened, and the air pump (30) is started. The air pump (30) draws external air into the air charging pipe (31), and the air in the air charging pipe (31) enters the mud delivery hose (22). The air pushes the mud remaining in the mud delivery hose (22) and the mud spraying pipe (20) to be sprayed onto the formed mud protective wall; when the mud in the mud delivery hose (22) and the mud spraying pipe (20) is completely sprayed out, the air in the mud delivery hose (22) is sprayed from the mud spraying pipe (20) onto the protective wall; S4, cleaning: After the drill bit (11) is removed from the hole, the control valve 1 (23) and the control valve 2 (32) are closed, the control valve 3 (52) is opened, and the water pump (50) is started. The water pump (50) pumps clean water into the mud delivery hose (22) through the water inlet pipe (51). The clean water is used to wash the mud remaining in the mud delivery hose (22) and the mud spraying pipe (20). The mud water formed by cleaning is discharged from the mud spraying pipe (20).

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