Rotary excavating and drilling wall protecting device used under complex geological conditions of water plant and construction technology

Abstract

The invention provides a rotary excavating and drilling wall protecting device used under complex geological conditions of a water plant and a construction technology, and belongs to the technical field of pile foundation construction.The rotary excavating and drilling wall protecting device comprises a wall protecting barrel, a sliding seat is slidably installed on the wall protecting barrel, the sliding seat is rotationally provided with a first rotating rod, and the wall protecting barrel is rotationally provided with a second rotating rod; a rotating ring is arranged at the free end of the first rotating rod, a connecting ring is arranged at the free end of the second rotating rod, the rotating ring and the connecting ring are connected in a crossed mode, and the sliding seat slides along the wall protecting barrel to drive the first rotating rod and the second rotating rod to gradually reduce from a flat angle relative to the included angle between the rotating ring and the connecting ring. The first rotating rod and the second rotating rod are inserted into the side wall of the pile hole. The included angle between the first rotating rod and the second rotating rod is gradually reduced from a flat angle, and the connecting ring and the rotating ring move in the direction away from the wall protecting barrel until being inserted into the side wall of the pile hole, so that the stability of the wall protecting barrel mounted in the pile hole is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pile foundation construction, in particular to a rotary drilling protection device and construction process for water plant under complex geological conditions. BACKGROUND

[0002] Rotary drilling pile, generally refers to the pile type constructed by rotary drilling rig, full name rotary drilling bored pile, engineering is referred to as rotary drilling pile. Because of using mechanical operation, the number of workers is not high, can save a lot of labor cost.

[0003] In the construction of water plant, rotary drilling construction often faces complex geological conditions, such as loose soil layer, karst geological area, backfill area, etc. When excavating pile hole in these complex geological areas, the side wall or hole of the pile hole is easy to collapse, forming the phenomenon of hole collapse, so that the pile hole construction is relatively difficult.

[0004] Therefore, when excavating pile hole in complex geological area, a protection cylinder in the form of cylindrical structure is installed in the pile hole, so that the protection cylinder can support the side wall of the pile hole, reduce the possibility of sand or soil collapse in the pile hole side wall and hole to the steel protection wall, so as to ensure the smooth construction of the pile hole.

[0005] But in the construction process, the stability of the protection cylinder is not good, so that the protection cylinder is easy to deviate when subjected to external force, thereby reducing the protection effect of the pile hole and reducing the safety performance of the protection cylinder. SUMMARY

[0006] The purpose of the present application is to provide a rotary drilling protection device and construction process for water plant under complex geological conditions, which can improve the stability of the protection cylinder when installed in the pile hole.

[0007] In the first aspect, the embodiments of the present application are realized by the following technical scheme: a rotary drilling protection device for water plant under complex geological conditions, comprising a protection cylinder for installation in the interior of the pile hole, a sliding seat is slidably installed on the protection cylinder along the length direction, a plurality of first rotating rods are rotatably arranged at one end of the sliding seat, a plurality of second rotating rods are rotatably arranged on the surface of the protection cylinder, the first rotating rods are one-to-one corresponding to the second rotating rods, a rotating ring is arranged at the free end of the first rotating rod, a connecting ring is arranged at the free end of the second rotating rod, the rotating ring and the connecting ring are cross connected, the sliding seat drives the first rotating rod and the second rotating rod to gradually reduce the included angle of the rotating ring and the connecting ring by sliding along the protection cylinder, until the first rotating rod and the second rotating rod are inserted into the side wall of the pile hole.

[0008] Further, side surfaces of the sliding seat are provided with helical guide strips in an axial protrusion, a sliding sleeve is sleeved on the sliding seat, helical grooves are formed in an inner wall of the sliding sleeve, the guide strips are slidingly arranged in the helical grooves, and the sliding sleeve rotates relative to the sliding seat under the resistance of the soil when the sliding seat moves, and the first rotating rod is rotationally connected with the sliding sleeve.

[0009] Further, outer surfaces of the first rotating rod and the second rotating rod are provided with bionic scale assemblies, and the bionic scale assemblies include a plurality of overlapping elastic metal sheets.

[0010] Further, one side of the first rotating rod and the second rotating rod facing the side wall of the pile hole is provided with a blade-shaped part, and a cross-section of the blade-shaped part has an acute angle.

[0011] Further, a surface of the wall protection cylinder is provided with an inflation ring, and the inflation ring is used to abut against the rotating ring and the connecting ring.

[0012] Further, a surface of the wall protection cylinder is provided with an annular accommodating groove, the inflation ring is arranged in the accommodating groove, a protruding block is arranged at a groove opening of the accommodating groove, the protruding block abuts against the inflation ring, a jacking part is arranged on a side of the protruding block away from the inflation ring, and the jacking part abuts against the rotating ring and the connecting ring.

[0013] Further, a power motor is arranged on the wall protection cylinder, a power screw is arranged on an output shaft of the power motor, an end of the sliding seat is provided with a screw hole in a height direction, and the power screw is arranged in the screw hole.

[0014] Further, the end of the sliding seat is further provided with a sealing assembly, the sealing assembly includes a sealing ring and a sealing gland, the sealing ring is arranged in the screw hole, the sealing gland is rotationally arranged at the end of the sliding seat, the sealing gland abuts against the sealing ring, and a hole groove is formed in the sealing gland and is matched with threads in the power screw.

[0015] Further, a mud discharging channel is formed in the sliding seat in a height direction.

[0016] In a second aspect, the application discloses a construction process of a rotary drilling wall protection device for a water plant under complex geological conditions, which comprises the following steps. S1, placing the wall protection cylinder in a pile hole to a preset position; S2, inflating the inflation ring, the inflation ring drives the rotating ring and the connecting ring to protrude from a surface of the wall protection cylinder, and an initial included angle between the first rotating rod and the second rotating rod is changed; S3. Start the power motor. The pneumatic motor drives the sliding seat to slide, reducing the angle between the first rotating rod and the second rotating rod, until the rotating ring and the connecting ring are inserted into the side wall of the pile hole.

[0017] The technical solutions of the embodiments of the present invention have at least the following advantages and beneficial effects: 1. The present invention rotatably sets a first rotating rod and a second rotating rod on the surface of the protective wall cylinder. When the protective wall cylinder moves to a preset position, the driving sliding seat slides along the protective wall cylinder, so that the included angle between the first rotating rod and the second rotating rod gradually decreases from a flat angle, so that the connecting ring and the rotating ring move away from the protective wall cylinder until they are inserted into the side wall of the pile hole, thereby increasing the stability of the connection between the protective wall cylinder and the side wall of the pile hole. 2. The present invention provides a biomimetic scale assembly on the surface of the first rotating rod and the second rotating rod, and uses overlapping elastic metal sheets to increase the friction between the first rotating rod and the second rotating rod and the soil on the side wall of the pile hole, so that the first rotating rod and the second rotating rod are more firmly inserted into the side wall of the pile hole. 3. The present invention provides an inflation ring on the surface of the protective cylinder. The inflated inflation ring pushes the connecting ring and the rotating ring away from the surface of the protective cylinder, changing the initial angle between the first rotating rod and the second rotating rod, which is beneficial for the relative rotation of the first rotating rod and the second rotating rod. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 for Figure 1 An enlarged schematic diagram of part A in the middle; Figure 3 This is an exploded view of the sliding seat structure in this invention; Figure 4 This is a schematic diagram of the receiving groove structure in the protective wall cylinder of the present invention; Figure 5 This is a schematic diagram showing the first rotating rod and the second rotating rod in a torsional state in this invention; Figure 6 This is a schematic diagram of the construction process for a rotary drilling wall protection device used in water plants under complex geological conditions.

[0020] Icons: 10. Wall-protecting cylinder; 11. Lifting ring; 12. Sensor mounting base; 13. Fixing base; 14. Second rotating rod; 15. Connecting ring; 16. Power motor; 17. Power screw; 18. Guide bar; 19. Receiving groove; 110. Protrusion; 111. Inflatable ring; 112. Lifting part; 20. Sliding seat; 21. Guide groove; 22. Screw hole; 23. Sealing ring; 24. Sealing gland; 25. Sludge discharge channel; 26. Guide bar; 27. Sliding sleeve; 28. Spiral groove; 29. ​​First rotating rod; 210. Rotating ring; 211. Blade-shaped part; 212. Elastic metal sheet. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0023] The following description, in conjunction with specific embodiments, further illustrates this point. Example

[0024] Reference Figures 1-5 As shown, this invention is a rotary drilling wall protection device for use in water plants under complex geological conditions. (Refer to...) Figure 1 The system includes a retaining wall cylinder 10, which is made of high-strength steel. The outer diameter of the retaining wall cylinder 10 matches the diameter of the pile hole, ensuring stable installation and providing sufficient support within the pile hole. A lifting ring 11 is installed at the top of the retaining wall cylinder 10. The lifting ring 11 is fixed to the top of the retaining wall cylinder 10 by a threaded connection. The lifting device can easily lift the retaining wall cylinder 10 into the pile hole, improving the convenience and efficiency of construction.

[0025] Reference Figure 1A sensor mounting base 12 is also installed on the outer wall of the retaining wall cylinder 10. Various sensors, including but not limited to displacement sensors, pressure sensors, and tilt sensors, are installed on the sensor mounting base 12 to monitor parameters such as position changes, stress conditions, and tilt angles of the retaining wall cylinder 10 in real time during construction, and transmit the data to an external monitoring system. The monitoring system uses this data to monitor and analyze the construction process in real time, promptly identifying and addressing potential problems to ensure the safety and quality of construction. Multiple annular reinforcing ribs are fixedly installed on the inner wall of the retaining wall cylinder 10. These ribs are evenly distributed along the axial direction of the retaining wall cylinder 10, with a spacing of 0.5-1 meter.

[0026] Reference Figure 1 and Figure 2 A fixed base 13 is fixedly installed on the wall-mounted cylinder 10. A second rotating rod 14 is rotatably mounted on the fixed base 13 via a universal joint. When the second rotating rod 14 is in contact with the surface of the wall-mounted cylinder 10, the length direction of the second rotating rod 14 is parallel to the axis of the wall-mounted cylinder 10. A connecting ring 15 is installed at the free end of the second rotating rod 14.

[0027] Reference Figure 1 A power motor 16 is also fixedly installed on the protective cylinder 10. The power motor 16 is located beside the fixed base 13. The output shaft of the power motor 16 is parallel to the axis of the protective cylinder 10, and a coupling is fixedly installed on the output shaft of the power motor 16. The power motor 16 is connected to the power screw 17 through the coupling. The coupling is an elastic coupling, which can compensate for the axial and radial deviations between the power motor 16 and the power screw 17, ensuring the stability and reliability of power transmission. In actual equipment, a housing is installed to protect the power motor 16 and the power screw 17. The housing covers the outside of the power motor 16 and the power screw 17 to prevent dirt from interfering with the movement of the power motor 16 driving the sliding seat 20. The housing is not shown in this embodiment. Of course, the housing can be directly installed on the power motor 16, without covering the power screw 17.

[0028] Reference Figure 1 and Figure 3A sliding seat 20 is slidably mounted on the protective wall cylinder 10. The sliding seat 20 is annular and fits onto the side of the protective wall cylinder 10, sliding up and down along it. Initially, a predetermined distance is reserved between the sliding seat 20 and the fixed seat 13. The outer surface of the sliding seat 20 is coated with a wear-resistant coating made of wear-resistant materials such as tungsten carbide, with a thickness of 0.5-1 mm. This wear-resistant coating effectively reduces frictional loss between the sliding seat 20 and the protective wall cylinder 10 during sliding, extending the service life of the sliding seat 20 and reducing sliding resistance, making the sliding of the sliding seat 20 smoother. A guide groove 21 is provided on the inner wall of the sliding seat 20, extending axially. A guide strip 18 is protruding along the axial direction on the surface of the protective wall cylinder 10, and is positioned within the guide groove 21. The cooperation between the guide groove 21 and the guide strip 18 ensures that the sliding seat 20 maintains stable linear motion during sliding.

[0029] Reference Figure 1 and Figure 3 A threaded hole 22 is formed inside the sliding seat 20 along its axial direction. A screw rod passes through the threaded hole 22. The power motor 16 drives the power screw 17 to move the sliding seat 20 along the protective cylinder 10 away from or towards the fixed seat 13. A sealing assembly is installed at the threaded hole 22 of the sliding seat 20. The sealing assembly includes a sealing ring 23 and a sealing cap 24. The sealing ring 23 is installed inside the threaded hole 22. The surface of the sealing cap 24 has a slot for the power screw 17 to pass through. The sealing cap 24 is fastened to the opening of the threaded hole 22, pressing the sealing ring 23 between the inner wall of the threaded hole 22 and the power screw 17. This prevents impurities such as mud and sand from entering the threaded hole 22, protects the threaded structure of the power screw 17 and the threaded hole 22, and ensures the normal rotation of the power screw 17 and the stable sliding of the sliding seat 20.

[0030] Reference Figure 3 The sliding seat 20 has sludge discharge channels 25 extending through both ends along its axial direction. The openings of the sludge discharge channels 25 are funnel-shaped, with the larger end of the funnel located on the end face of the sliding seat 20 and the smaller end located inside the sliding seat 20. When the sliding seat 20 slides along the protective cylinder 10, the soil passes through the sludge discharge channels 25, which helps to reduce the resistance of the soil to the movement of the sliding seat 20.

[0031] Reference Figure 3 and Figure 5A guide strip 26 is spirally protruding along the axial direction on the periphery of the sliding seat 20. A sliding sleeve 27 is slidably mounted on the sliding seat 20, and the inner diameter of the sliding sleeve 27 is larger than the outer diameter of the sliding seat 20. A spiral groove 28 is formed on the inner wall of the sliding sleeve 27, extending along the axial direction of the sliding sleeve 27, and the pitch of the spiral groove 28 is equal to the pitch of the guide strip 26. The guide strip 26 is located within the spiral groove 28. When the sliding seat 20 slides along the protective wall cylinder 10, the sliding sleeve 27 is located outside the sliding seat 20 and is subject to the resistance of the surrounding soil, causing the sliding sleeve 27 to rotate around the sliding seat 20 along the guide strip 26.

[0032] Reference Figure 1 and Figure 2 The sliding sleeve 27 and sliding seat 20 have a first rotating rod 29 rotatably mounted on one end facing the fixed seat 13 via a cross universal joint. A rotating ring 210 is provided on the free end of the first rotating rod 29, and the rotating ring 210 is cross-connected to the connecting ring 15. As the sliding seat 20 moves closer to the fixed seat 13 along the retaining wall cylinder 10, the angle between the first rotating rod 29 and the second rotating rod 14 around the rotating ring 210 and the connecting ring 15 gradually decreases, causing the rotating ring 210 and the connecting ring 15 to move closer to the sidewall of the pile hole. Furthermore, the sliding sleeve 27 causes the first rotating rod 29 and the second rotating rod 14 to twist relative to the retaining wall cylinder 10, resulting in a larger contact area when the first rotating rod 29 and the second rotating rod 14 are inserted into the sidewall of the pile hole, increasing the connection strength between the first rotating rod 29 and the second rotating rod and the soil.

[0033] It should be emphasized that the multiple sets of first rotating rods 29 and second rotating rods 14 will exhibit disordered torsion, which will make them more stable after being inserted into the side wall of the pile hole.

[0034] Reference Figure 3The cross-sections of the first rotating rod 29 and the second rotating rod 14 are triangular, with the tips of the first rotating rod 29 and the second rotating rod 14 being blade-shaped portions 211. The included angle of the blade-shaped portions 211 is an acute angle, which facilitates the insertion of the first rotating rod 29 and the second rotating rod 14 into the side wall of the pile hole. Biomimetic scale assemblies are rotatably disposed on the surfaces of the first rotating rod 29 and the second rotating rod 14. The biomimetic scale assemblies include overlapping and rotating elastic metal sheets 212. One end of the elastic metal sheet 212 is rotatably mounted on the surface of the first rotating rod 29 and the second rotating rod 14 via a rotating shaft, and the rotating shaft of the elastic metal sheet 212 is perpendicular to the rod body of the first rotating rod 29 and the second rotating rod 14. In the first rotating rod 29, the second end of each elastic metal sheet 212 overlaps the first end of the next elastic metal sheet 212, forming a unidirectional overlapping arrangement. Similarly, the elastic metal sheets 212 on the second rotating rod 14 also form a unidirectional tiled arrangement. When the soil vibrates, causing the first rotating rod 29 or the second rotating rod 14 to detach from the sidewall of the pile hole, the biomimetic scale assembly rotates in the opposite direction to form barbs, increasing the connection stability between the first rotating rod 29 or the second rotating rod 14 and the soil.

[0035] Reference Figure 1 and Figure 4 A receiving groove 19 is annularly formed around the axis on the surface of the protective cylinder 10. The receiving groove 19 is located between the fixed seat 13 and the sliding seat 20. When the angle between the first rotating rod 29 and the second rotating rod 14 is a flat angle, the receiving groove 19 is opposite to the connecting ring 15 and the rotating ring 210. A protrusion 110 is connected to the opening of the receiving groove 19 by a flexible material. The protrusion 110 is annular, and a lifting part 112 is provided on the side of the protrusion 110 facing away from the inside of the receiving groove 19. An inflation ring 111 is installed in the receiving groove 19. When the inflation ring 111 inflates, the inflation ring 111 abuts against the connection between the first rotating rod 29 and the second rotating rod 14 through the lifting part 112, causing the angle between the first rotating rod 29 and the second rotating rod 14 to change from a flat angle to an obtuse angle, thus preventing the first rotating rod 29 and the second rotating rod 14 from abutting against each other and restricting the sliding seat 20 from sliding along the protective cylinder 10. Example

[0036] This embodiment provides a construction process for a rotary drilling wall protection device used in complex geological conditions of a water plant, referring to... Figure 6 As shown, the construction process includes: S1. Place the protective cylinder 10 into the pile hole to the preset position; After the sidewall of the pile hole is drilled, the protective cylinder 10 is hoisted into the pile hole by a crane and placed in the preset position.

[0037] S2. Inflate the inflation ring 111. The inflation ring 111 pushes the rotating ring 210 and the connecting ring 15 to protrude from the surface of the protective cylinder 10, changing the initial angle between the first rotating rod 29 and the second rotating rod 14. First, air is injected into the inflation ring 111 using an air compressor. After the inflation ring 111 expands, it pushes the protrusion 110 to move. The lifting part 112 in the protrusion 110 abuts against the rotating ring 210 and the connecting ring 15, changing the initial included angle between the first rotating rod 29 and the second rotating rod 14 to an obtuse angle, thus preparing for the sliding seat 20 to move along the protective cylinder 10.

[0038] S3. Start the power motor 16. The pneumatic motor drives the sliding seat 20 to slide, causing the included angle between the first rotating rod 29 and the second rotating rod 14 to decrease until the rotating ring 210 and the connecting ring 15 are inserted into the side wall of the pile hole.

[0039] The power motor 16 drives the power screw 17 to rotate. The power screw 17 passes through the screw hole 22 in the sliding seat 20. Since the sliding seat 20 cannot rotate relative to the retaining wall cylinder 10, it moves axially along the retaining wall cylinder 10. When the sliding seat 20 moves closer to the fixed seat 13, the first rotating rod 29 and the second rotating rod 14 rotate, respectively driving the rotating ring 210 and the connecting ring 15, one end of which protrudes from the surface of the retaining wall cylinder 10, to insert into the side wall of the pile hole. During the insertion of the first rotating rod 29 and the second rotating rod 14 into the soil, the biomimetic scale assembly is in a forward-facing covering position to reduce resistance, and the first rotating rod 29 and the second rotating rod 14 increase the stability of the retaining wall cylinder 10 in the pile hole. At the same time, the sliding sleeve 27 is resisted by the soil and rotates relative to the sliding seat 20, causing the first rotating rod 29 and the second rotating rod 14 to twist relative to the retaining wall cylinder 10, increasing the contact area between the first rotating rod 29 and the second rotating rod 14 and the side wall of the pile hole.

[0040] When the first rotating rod 29 and the second rotating rod 14 are pulled out from the soil, the biomimetic scale assembly opens in the reverse direction, increasing resistance.

[0041] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A rotary drilling wall protection device for use in water plants under complex geological conditions, characterized in that: The system includes a retaining wall cylinder (10) for installation into the pile hole. A sliding seat (20) is slidably mounted on the retaining wall cylinder (10) along its length. One end of the sliding seat (20) is rotatably provided with multiple first rotating rods (29), and the surface of the retaining wall cylinder (10) is rotatably provided with multiple second rotating rods (14). Each of the multiple first rotating rods (29) corresponds one-to-one with each of the multiple second rotating rods (14). A rotating ring (210) is provided at the free end of each of the first rotating rods (29). The free end of the second rotating rod (14) is provided with a connecting ring (15). The rotating ring (210) and the connecting ring (15) are connected in a cross shape. The sliding seat (20) slides along the protective cylinder (10) to drive the first rotating rod (29) and the second rotating rod (14) to gradually reduce the angle between them and the rotating ring (210) and the connecting ring (15) from a flat angle until the first rotating rod (29) and the second rotating rod (14) are inserted into the side wall of the pile hole.

2. The rotary drilling wall protection device for complex geological conditions in water plants according to claim 1, characterized in that: The sliding seat (20) has a spiral guide strip (26) protruding along the axial direction on its side. A sliding sleeve (27) is fitted on the sliding seat (20). A spiral groove (28) is opened on the inner wall of the sliding sleeve (27). The guide strip (26) is slidably disposed in the spiral groove (28). When the sliding seat (20) moves, the sliding sleeve (27) rotates relative to the sliding seat (20) under the resistance of the soil. The first rotating rod (29) is rotatably connected to the sliding sleeve (27).

3. The rotary drilling wall protection device for complex geological conditions in water plants according to claim 2, characterized in that: The outer surfaces of the first rotating rod (29) and the second rotating rod (14) are provided with biomimetic scale assemblies, which include a plurality of elastic metal sheets (212) that are stacked sequentially.

4. The rotary drilling wall protection device for complex geological conditions in water plants according to claim 3, characterized in that: The first rotating rod (29) and the second rotating rod (14) are provided with a blade-shaped part (211) on the side facing the sidewall of the pile hole, and the included angle of the cross section of the blade-shaped part (211) is an acute angle.

5. The rotary drilling wall protection device for complex geological conditions in water plants according to claim 4, characterized in that: The surface of the protective cylinder (10) is provided with an air ring (111), which is used to abut against the rotating ring (210) and the connecting ring (15).

6. The rotary drilling wall protection device for complex geological conditions in water plants according to claim 5, characterized in that: The surface of the protective cylinder (10) is provided with an annular receiving groove (19), the inflation ring (111) is disposed in the receiving groove (19), a protrusion (110) is provided at the opening of the receiving groove (19), the protrusion (110) abuts against the inflation ring (111), and a lifting part (112) is provided on the side of the protrusion (110) facing away from the inflation ring (111), the lifting part (112) abuts against the rotating ring (210) and the connecting ring (15).

7. The rotary drilling wall protection device for complex geological conditions in water plants according to claim 6, characterized in that: The protective cylinder (10) is equipped with a power motor (16), and the output shaft of the power motor (16) is equipped with a power screw (17). The end of the sliding seat (20) is provided with a screw hole (22) along the height direction, and the power screw (17) passes through the screw hole (22).

8. The rotary drilling wall protection device for complex geological conditions in water plants according to claim 7, characterized in that: The end of the sliding seat (20) is also provided with a sealing assembly, which includes a sealing ring (23) and a sealing cap (24). The sealing ring (23) is disposed in the screw hole (22), and the sealing cap (24) is rotatably disposed at the end of the sliding seat (20). The sealing cap (24) abuts against the sealing ring (23), and the sealing cap (24) has a slot that matches the thread in the power screw (17).

9. The rotary drilling wall protection device for complex geological conditions in water plants according to claim 8, characterized in that: The sliding seat (20) has a mud discharge channel (25) extending through it along the height direction.

10. A construction process for the rotary drilling wall protection device for complex geological conditions in water plants as described in claim 9, characterized in that: S1. Place the protective wall cylinder (10) into the pile hole to the preset position; S2. Inflate the air ring (111) with air. The air ring (111) pushes the rotating ring (210) and the connecting ring (15) to protrude from the surface of the protective cylinder (10), changing the initial angle between the first rotating rod (29) and the second rotating rod (14). S3. Start the power motor (16). The pneumatic motor drives the sliding seat (20) to slide, causing the included angle between the first rotating rod (29) and the second rotating rod (14) to decrease until the rotating ring (210) and the connecting ring (15) are inserted into the side wall of the pile hole.

Images