Large-diameter sand layer geological composite pile foundation super-long steel casing mud skin cleaning mechanism

Abstract

The application belongs to the technical field of pile foundation construction steel casing cleaning, and particularly relates to a large-diameter sand layer geological composite pile foundation super-long steel casing mud skin cleaning mechanism, which comprises a steel casing, and the inner part of the steel casing is respectively provided with a mud skin vertical reciprocating cleaning mechanism, a mud skin circumferential rotating cleaning mechanism, a power linkage mechanism and a rotating scraper mechanism. The large-diameter sand layer geological composite pile foundation super-long steel casing mud skin cleaning mechanism, the device is used in combination with the mud skin vertical reciprocating cleaning mechanism and the mud skin circumferential rotating cleaning mechanism arranged in the steel casing for cleaning mud, and the inner wall of the steel casing is cleaned through vertical reciprocation and rotation of the steel brush, so that the mud on the inner wall of the steel casing can be effectively removed, the stability is improved, the mud and dirt on the inner wall can be effectively removed, the service life of the steel casing is prolonged, the cleaning work can be quickly and efficiently completed, the construction efficiency is improved, personnel can be prevented from entering the inside of the steel casing for cleaning, and the work safety is improved.

Description

Technical Field

[0001] This invention relates to the field of steel casing cleaning technology in pile foundation construction, and in particular to a mud skin cleaning mechanism for ultra-long steel casings in large-diameter composite pile foundations with sandy strata. Background Technology

[0002] Currently, the cleaning of steel casings in pile foundation construction often employs methods such as water flushing and high-pressure air purging. However, these methods are ineffective when dealing with large-diameter, ultra-long steel casings due to the large internal space, tight adhesion of soil and concrete, and the fact that traditional cleaning methods require manual operation. These methods are limited by the cleaning range and angle, making it impossible to thoroughly clean the entire inner wall of the steel casing, thus affecting the cleaning effect. Consequently, the cleaning results are low, costly, and unsatisfactory. Therefore, a mud-skin cleaning mechanism for ultra-long steel casings in large-diameter sandy geological composite pile foundations is needed. Summary of the Invention

[0003] Based on existing technical problems, this invention proposes a mud-skin cleaning mechanism for ultra-long steel casings of large-diameter sandy geological composite pile foundations.

[0004] The present invention proposes a mud-skin cleaning mechanism for ultra-long steel casings of large-diameter composite pile foundations in sandy strata, comprising a steel casing, wherein the interior of the steel casing is respectively provided with a vertical reciprocating mud-skin cleaning mechanism, a circumferential rotating mud-skin cleaning mechanism, a power linkage mechanism, and a rotating scraper mechanism.

[0005] The vertical reciprocating mud cleaning mechanism includes a cleaning steel brush, which enables the cleaning steel brush to reciprocate in the vertical direction to clean the mud on the inner wall of the steel casing.

[0006] The circumferential rotation cleaning mechanism enables the cleaning steel brush to move in a circular motion around the axis of the steel casing to clean the mud on the inner wall of the steel casing.

[0007] The power linkage mechanism enables the vertical reciprocating mud cleaning mechanism and the rotary scraper mechanism to drive the cleaning action synchronously.

[0008] The rotating scraper mechanism enables the automatic scraping action of the scraper to remove mud clogging the surface of the steel brush.

[0009] Preferably, the vertical reciprocating mud cleaning mechanism includes a drill bit with an inclined arc surface. The bottom of the drill bit is slidably inserted into the inner wall of the steel casing. The inclined arc surface of the drill bit is provided with a dust collection groove and an inclined sliding groove. The multiple inclined sliding grooves are arranged in a ring around the axis of the drill bit, and the dust collection groove is located at the bottom of the multiple inclined sliding grooves.

[0010] Preferably, a slider is slidably inserted into the inner wall of the inclined groove, an adjustment groove is formed on one side surface of the slider, a spring is fixedly installed on the inner side wall of the adjustment groove, a plurality of springs are linearly arranged inside the adjustment groove, an inclined mounting block is fixedly installed on one end of the plurality of springs, and one side surface of the inclined mounting block is slidably inserted into the inner wall of the adjustment groove.

[0011] Preferably, annular mounting plates are fixedly mounted on the surfaces of the plurality of inclined mounting blocks, the arc surface of the annular mounting plates is fixedly mounted to the surface of the cleaning steel brush, the three annular mounting plates are arranged linearly in a vertical direction, and a compression spring is fixedly mounted on the inner bottom wall of the inclined slide, the top of the compression spring is fixedly mounted to the bottom of the slider.

[0012] Preferably, the top of the drill bit has a mounting hole, the inner bottom wall of the mounting hole is fixedly mounted with a drive motor, the output shaft of the drive motor is fixedly mounted with a drive shaft through a coupling, the inner arc sidewall of the mounting hole is also fixedly mounted with a sealing plate, the top of the drive shaft extends through and to the top of the sealing plate, and a large conical tooth is fixedly mounted on the top of the drive shaft.

[0013] Preferably, a bearing housing is fixedly installed on the top of the drill bit, and multiple bearing housings are arranged in a ring on the top of the drill bit. A driven shaft is rotatably connected to the surface of the bearing housing via a bearing. A small bevel tooth is fixedly installed on one end of the driven shaft, and the tooth grooves of multiple small bevel teeth mesh with the gear teeth of the large bevel tooth. A cam and a conversion bevel tooth are fixedly installed on the other end of the driven shaft, and the surfaces of multiple cams are in contact with the top of the ring mounting plate.

[0014] Preferably, the mud-skin circumferential rotation cleaning mechanism includes a drive shaft, a connecting seat is fixedly installed at the bottom of the drive shaft, the bottom of the connecting seat is fixedly installed with the top of the drill bit, the arc surface of the connecting seat is provided with a clearance groove, and three clearance grooves are distributed in a circular array on the arc surface of the connecting seat. The driven shaft is located inside the clearance groove, and the drive shaft is driven by the drive source of the drilling machine.

[0015] Preferably, the power linkage mechanism includes a linkage plate, one end of which is fixedly installed on the arc surface of the connecting seat, and a linkage shaft is rotatably connected to the surface of the linkage plate via a bearing. A linkage bevel gear is fixedly installed at the bottom of the linkage shaft, and the tooth groove of the linkage bevel gear meshes with the gear teeth of the conversion bevel gear. A gear is fixedly installed at the top of the linkage shaft.

[0016] Preferably, the rotary scraper mechanism includes a turntable, a turntable bearing is fixedly installed on the inner wall of the turntable, the inner ring of the turntable bearing is fixedly installed on the arc surface of the drive shaft, scraping teeth are fixedly installed on one side of the arc surface of the turntable, the surface of the scraping teeth is slidably inserted into the surface of the cleaning steel brush, and a toothed ring is fixedly installed at the bottom of the turntable, the teeth of the toothed ring meshing with the tooth groove of the gear.

[0017] The present invention proposes a cleaning method for a mud removal mechanism for an ultra-long steel casing of a large-diameter composite pile foundation in sandy soil. Step 1: During operation, the drilling machine controls the drive shaft to rotate, driving the drill bit to move vertically downward inside the steel casing. At the same time, the drill bit rotates downward, thereby driving the cleaning steel brushes arranged in a ring on the surface to rotate in a circle and contact the inner wall of the steel casing to clean the mud adhering to the surface.

[0018] Step 2: While cleaning in a circular motion, control the drive motor to work. The drive motor drives the drive shaft to rotate, thereby controlling the rotation of the large bevel gear at the top of the drive shaft. With multiple small bevel gears meshing with the large bevel gear, the drive shaft is driven to rotate synchronously, causing the driven shaft to rotate. The rotation of the driven shaft controls the rotation of the cam at one end. The surface of the cam then applies pressure to the annular mounting plate below, causing the slider to slide downwards and squeeze the compression spring at the bottom. When the lowest point of the cam leaves the surface of the annular mounting plate, the reverse thrust of the compression spring controls the annular mounting plate to move upwards. The rotation of the cam then drives the cleaning steel brush to achieve reciprocating motion in a vertical state. The reciprocating motion of the cleaning steel brush, combined with the circumferential rotational force, quickly cleans the inner wall of the steel casing.

[0019] Step 3: During cleaning, the driven shaft is controlled to rotate synchronously by the power linkage mechanism, which controls the rotation of the linkage shaft. This controls the rotation of the top gear. As the gear rotates, the gear ring rotates in a circular motion around the axis of the drive shaft. This causes the scraper teeth to rotate around the axis of the drive shaft and come into contact with the surface of the cleaning steel brush. The scraper teeth scrape off the dirt accumulated on the surface of the cleaning steel brush by their edge teeth, causing it to fall off.

[0020] The beneficial effects of this invention are as follows:

[0021] 1. This device, used in cleaning soil from steel casings, employs a combination of a vertical reciprocating mud cleaning mechanism and a circumferential rotating mud cleaning mechanism. It uses steel brushes to vertically and rotary clean the inner wall of the steel casing, effectively removing soil and improving its stability. It also effectively removes soil and dirt from the inner wall, extending the service life of the steel casing. Furthermore, it enables rapid and efficient cleaning, improving construction efficiency, and avoids the need for personnel to enter the steel casing for cleaning, thus enhancing work safety.

[0022] 2. A rotating scraper mechanism is also included to address the issue of dirt adhering to the steel brush surface during the cleaning of the inner wall of the steel casing, forming a sticky residue that is difficult to remove completely. The scraper operation removes the dirt, reducing its adhesion to the steel brush and making it easier to clean. Furthermore, the scraper operation increases the impact force between the steel brush and the dirt, further breaking down the dirt's structure and making it easier to loosen and detach. This improves the cleaning effect, ensuring a thorough cleaning of the inner wall of the steel casing. The scraper operation also quickly removes dirt adhering to the steel brush, reducing cleaning time and increasing cleaning speed. The scraper can quickly scrape away the dirt, causing it to detach rapidly from the steel brush surface. Finally, when cleaning the inner wall of the steel casing, dirt may clog the pores of the steel brush or become entangled on it, affecting the cleaning effect. The scraper operation prevents excessive dirt accumulation on the steel brush, reducing clogging and keeping the steel brush clean. Attached Figure Description

[0023] Figure 1 A schematic diagram of a mud cake removal mechanism for an ultra-long steel casing of a large-diameter composite pile foundation in sandy soil geology.

[0024] Figure 2 A cross-sectional view of the steel casing structure of a mud-skin removal mechanism for an ultra-long steel casing of a large-diameter composite pile foundation in sandy soil geology;

[0025] Figure 3 A three-dimensional diagram of the turntable structure of a mud-skin cleaning mechanism for an ultra-long steel casing of a large-diameter composite pile foundation in sandy soil geology;

[0026] Figure 4 A three-dimensional diagram of the connecting seat structure of a mud cake cleaning mechanism for an ultra-long steel casing of a large-diameter composite pile foundation in sandy soil geology.

[0027] Figure 5 A three-dimensional diagram of the drill bit structure for a mud-skin removal mechanism for an ultra-long steel casing of a large-diameter composite pile foundation in sandy strata.

[0028] Figure 6 A three-dimensional diagram of a vertical reciprocating mud removal mechanism for a large-diameter composite pile foundation in sandy soil geology with an ultra-long steel casing mud removal mechanism;

[0029] Figure 7 A three-dimensional diagram of a rotating scraper mechanism for cleaning mud skin from an ultra-long steel casing of a large-diameter composite pile foundation in sandy soil geology.

[0030] Figure 8 A three-dimensional diagram of the power linkage mechanism for a mud-skin cleaning mechanism of an ultra-long steel casing for a large-diameter composite pile foundation in sandy strata.

[0031] Figure 9 A three-dimensional diagram of the slider structure of a mud-skin cleaning mechanism for an ultra-long steel casing of a large-diameter composite pile foundation in sandy soil geology;

[0032] Figure 10 A three-dimensional diagram of the cleaning steel brush structure of a mud-skin cleaning mechanism for an ultra-long steel casing of a large-diameter composite pile foundation in sandy soil geology.

[0033] Figure 11 This is a three-dimensional diagram of a mud-skin circumferential rotation cleaning mechanism for a large-diameter composite pile foundation with an ultra-long steel casing.

[0034] In the diagram: 1. Steel casing; 2. Vertical reciprocating mud removal mechanism; 21. Cleaning steel brush; 22. Drill bit; 23. Dust collection trough; 24. Inclined slide; 25. Slider; 26. Adjustment groove; 27. Spring; 28. Inclined mounting block; 29. ​​Annular mounting plate; 210. Compression spring; 211. Mounting hole; 212. Drive motor; 213. Drive shaft; 214. Sealing plate; 215. Large bevel gear; 216. Shaft 217. Bearing seat; 218. Driven shaft; 219. Small bevel gear; 220. Cam; 221. Converting bevel gear; 3. Mud skin circumferential rotation cleaning mechanism; 31. Drive shaft; 32. Connecting seat; 33. Clearance groove; 4. Power linkage mechanism; 41. Linkage plate; 42. Linkage shaft; 43. Linkage bevel gear; 44. Gear; 5. Rotary scraper mechanism; 51. Turntable; 52. Turntable bearing; 53. Scraper tooth; 54. Gear ring. Detailed Implementation

[0035] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0036] Reference Figures 1-11 A mud cleaning mechanism for ultra-long steel casings of large-diameter sandy geological composite pile foundations includes a steel casing 1. Inside the steel casing 1, there are a vertical reciprocating mud cleaning mechanism 2, a circumferential rotating mud cleaning mechanism 3, a power linkage mechanism 4, and a rotating scraper mechanism 5.

[0037] The vertical reciprocating mud cleaning mechanism 2 includes a cleaning steel brush 21.

[0038] To achieve the action of cleaning the steel brush 21 reciprocating in the vertical direction to clean the mud on the inner wall of the steel casing 1; the mud vertical reciprocating cleaning mechanism 2 includes a drill bit 22, the arc surface of the drill bit 22 is inclined, the bottom of the drill bit 22 is slidably inserted into the inner wall of the steel casing 1, and the inclined arc surface of the drill bit 22 is respectively provided with a dust collection groove 23 and an inclined slide groove 24. The multiple inclined slide grooves 24 are all arranged in a ring equally about the axis of the drill bit 22, and the dust collection groove 23 is located at the bottom of the multiple inclined slide grooves 24.

[0039] Specifically, this is implemented by opening a dust collection groove 23 and an inclined slide 24 on the inclined arc surface of the drill bit 22. After the soil inside the steel casing 1 is cleaned, it falls into the dust collection groove 23, which is convenient for later processing and waste soil collection.

[0040] A slider 25 is slidably inserted into the inner wall of the inclined groove 24. An adjustment groove 26 is provided on one side surface of the slider 25. A spring 27 is fixedly installed on the inner side wall of the adjustment groove 26. Multiple springs 27 are linearly arranged inside the adjustment groove 26. An inclined mounting block 28 is fixedly installed on one end of the multiple springs 27. One side surface of the inclined mounting block 28 is slidably inserted into the inner wall of the adjustment groove 26.

[0041] Specifically, a slider 25 is installed inside the inclined groove 24, and an adjustment groove 26 is opened on the surface of the slider 25. Then, multiple springs 27 inside the adjustment groove 26 continuously apply an outward squeezing force to the inclined mounting block 28, thereby facilitating the cleaning steel brush 21 to squeeze the inner wall of the steel casing 1 to clean the attached soil.

[0042] Annular mounting plates 29 are fixedly mounted on the surfaces of multiple inclined mounting blocks 28. The arc surface of the annular mounting plates 29 is fixedly mounted to the surface of the cleaning steel brush 21. The three annular mounting plates 29 are arranged linearly in a vertical direction. A compression spring 210 is fixedly mounted on the inner bottom wall of the inclined slide 24. The top of the compression spring 210 is fixedly mounted to the bottom of the slider 25.

[0043] Specifically, this is achieved by using three annular mounting plates 29 to control the linear distribution of three cleaning steel brushes 21 on the surface. The cleaning steel brushes 21 are driven to scrape and clean the inner wall of the steel casing 1 through reciprocating motion in the vertical direction. At the same time, the compression spring 210 always provides an upward thrust to the slider 25.

[0044] The top of the drill bit 22 has a mounting hole 211. A drive motor 212 is fixedly installed on the inner bottom wall of the mounting hole 211. The output shaft of the drive motor 212 is fixedly installed with a drive shaft 213 through a coupling. A sealing plate 214 is also fixedly installed on the inner arc side wall of the mounting hole 211. The top of the drive shaft 213 extends through and to the top of the sealing plate 214, and a large bevel tooth 215 is fixedly installed on the top of the drive shaft 213.

[0045] Specifically, during the vertical reciprocating motion, the drive motor 212 drives the drive shaft 213 to rotate, which in turn drives the large bevel gear 215 at the top to rotate, providing a synchronous driving force.

[0046] A bearing housing 216 is fixedly installed on the top of the drill bit 22. Multiple bearing housings 216 are arranged in a ring on the top of the drill bit 22. A driven shaft 217 is rotatably connected to the surface of the bearing housing 216 through a bearing. A small bevel tooth 218 is fixedly installed on one end of the driven shaft 217. The tooth grooves of multiple small bevel teeth 218 mesh with the gear teeth of large bevel teeth 215. A cam 219 and a conversion bevel tooth 220 are fixedly installed on the other end of the driven shaft 217 respectively. The surfaces of multiple cams 219 are in contact with the top of the annular mounting plate 29.

[0047] Specifically, when the large bevel tooth 215 rotates, it simultaneously drives multiple small bevel teeth 218 that mesh with the surface to rotate, causing multiple driven shafts 217 to rotate simultaneously, driving the cam 219 at one end to rotate. In turn, the surface of the cam 219 is used to press the annular mounting plate 29 below, which, in conjunction with the compression spring 210, creates a vertical reciprocating motion effect.

[0048] To achieve the action of cleaning the steel brush 21 in a circular motion around the axis of the steel casing 1 to clean the mud on the inner wall of the steel casing 1, the mud cleaning mechanism 3 includes a drive shaft 31. A connecting seat 32 is fixedly installed at the bottom of the drive shaft 31. The bottom of the connecting seat 32 is fixedly installed at the top of the drill bit 22. The arc surface of the connecting seat 32 is provided with a relief groove 33. The three relief grooves 33 are distributed in a ring array on the arc surface of the connecting seat 32. The driven shaft 217 is located inside the relief groove 33. The drive shaft 31 is driven by the drive source of the drilling machine.

[0049] Specifically, during the vertical reciprocating motion, the drilling machine's drive shaft 31 rotates, causing the drill bit 22 to rotate and drive downwards inside the steel casing 1. This allows the cleaning brush 21 to quickly scrape and remove the soil from the inner wall of the steel casing 1 under the combined force of circumferential rotation and vertical reciprocating motion.

[0050] In order to achieve synchronous linkage between the vertical reciprocating mud cleaning mechanism 2 and the rotary scraper mechanism 5, the power linkage mechanism 4 includes a linkage plate 41. One end of the linkage plate 41 is fixedly installed on the arc surface of the connecting seat 32. The surface of the linkage plate 41 is rotatably connected to the linkage shaft 42 through a bearing. The bottom of the linkage shaft 42 is fixedly installed with a linkage bevel gear 43. The tooth groove of the linkage bevel gear 43 meshes with the gear teeth of the conversion bevel gear 220. The top of the linkage shaft 42 is fixedly installed with a gear 44.

[0051] Specifically, this is implemented by using the power linkage mechanism 4 to enable one power to drive multiple mechanisms to work simultaneously. The linkage bevel gear 43 at the bottom of the linkage shaft 42 meshes with the conversion bevel gear 220, thereby transmitting the rotational power of the driven shaft 217 to the linkage shaft 42, driving the linkage shaft 42 to rotate.

[0052] To achieve the automatic scraping action of cleaning the mud clogging the surface of the steel brush 21, the rotary scraping mechanism 5 includes a turntable 51. A turntable bearing 52 is fixedly installed on the inner wall of the turntable 51. The inner ring of the turntable bearing 52 is fixedly installed on the arc surface of the drive shaft 31. A scraping tooth 53 is fixedly installed on one side of the arc surface of the turntable 51. The surface of the scraping tooth 53 slides into contact with the surface of the cleaning steel brush 21. A toothed ring 54 is fixedly installed at the bottom of the turntable 51. The teeth of the toothed ring 54 mesh with the tooth groove of the gear 44.

[0053] Specifically, when the linkage drive rotates the linkage shaft 42, it controls the gear 44 to rotate, thereby controlling the top gear ring 54 to perform circumferential motion. This, in turn, drives the scraper tooth 53 at one end to perform circumferential motion, making sliding contact with the surface of the cleaning steel brush 21. The grooves of the scraper tooth 53 then contact and scrape the surface of the cleaning steel brush 21, thus preventing the cleaning steel brush 21 from accumulating on its surface when cleaning the inner wall of the steel casing 1. This would prevent the cleaning steel brush 21 from continuing to clean the inner wall of the steel casing 1, thereby increasing the service life of the cleaning steel brush 21 and preventing it from becoming clogged and unusable.

[0054] This device, used in the cleaning of soil from the steel casing 1, employs a combination of a vertical reciprocating mud cleaning mechanism 2 and a circumferential rotating mud cleaning mechanism 3. These mechanisms work together to clean the inner wall of the steel casing 1 using vertical reciprocating and rotating steel brushes. This effectively removes soil from the inner wall of the steel casing 1, improving its stability; it also effectively removes soil and dirt from the inner wall, extending the service life of the steel casing 1; it allows for rapid and efficient cleaning, improving construction efficiency; and it prevents personnel from entering the interior of the steel casing 1 for cleaning, thus improving work safety.

[0055] Simultaneously, a rotating scraper mechanism 5 is also provided. During the cleaning of the inner wall of the steel casing 1, dirt may sometimes adhere to the surface of the steel brush, forming a sticky substance that is difficult to completely remove. The scraper operation allows the dirt to fall off, reducing its adhesion to the steel brush and making it easier to clean. Furthermore, the scraper operation increases the impact force between the steel brush and the dirt, further breaking down the dirt's structure and making it easier to loosen and detach. This improves the cleaning effect, ensuring a thorough cleaning of the inner wall of the steel casing 1. The scraper operation also quickly removes dirt adhering to the steel brush, reducing cleaning time and increasing cleaning speed. The scraper can quickly scrape away the dirt, causing it to detach rapidly from the steel brush surface. Finally, when cleaning the inner wall of the steel casing 1, dirt may clog the pores of the steel brush or become entangled on it, affecting the cleaning effect. The scraper operation prevents excessive dirt accumulation on the steel brush, reducing clogging and maintaining the cleanliness of the steel brush.

[0056] Reference Figure 1-3A cleaning method for a mud removal mechanism for an ultra-long steel casing of a large-diameter composite pile foundation in sandy soil. Step 1: During operation, the drilling machine controls the drive shaft 31 to rotate, driving the drill bit 22 to move vertically downward inside the steel casing 1. At the same time, the drill bit 22 rotates downward, thereby driving the cleaning steel brush 21, which is arranged in a ring on the surface, to rotate in a circle and contact the inner wall of the steel casing 1 to clean the mud attached to the surface.

[0057] Step 2: While cleaning in a circular rotation, control the drive motor 212 to work. The drive motor 212 drives the drive shaft 213 to rotate, thereby controlling the rotation of the large bevel gear 215 at the top of the drive shaft 213. With multiple small bevel gears 218 meshing with the large bevel gear 215, the multiple small bevel gears 218 are driven to rotate synchronously, causing the driven shaft 217 to rotate. The rotation of the driven shaft 217 controls the rotation of the cam 219 at one end. Then, the surface of the cam 219 applies pressure to the annular mounting plate 29 below, causing its slider 25 to slide downward and squeeze the compression spring 210 at the bottom. When the lowest point of the cam 219 leaves the surface of the annular mounting plate 29, the reverse thrust of the compression spring 210 controls the annular mounting plate 29 to move upward. Then, the rotation of the cam 219 drives the cleaning steel brush 21 to achieve reciprocating motion in a vertical state. The cleaning steel brush 21 in the reciprocating motion state, in combination with the circumferential rotation force, quickly cleans the inner wall of the steel casing 1.

[0058] Step 3: During cleaning, the driven shaft 217 is rotated by the power linkage mechanism 4, which synchronously drives the linkage shaft 42 to rotate. This controls the rotation of the top gear 44. As the gear 44 rotates, the gear ring 54 rotates in a circular motion around the axis of the drive shaft 31. This causes the scraper teeth 53 to rotate around the axis of the drive shaft 31 and come into contact with the surface of the cleaning steel brush 21. The scraper teeth 53 scrape away the dirt accumulated on the surface of the cleaning steel brush 21 through their edge teeth, causing it to fall off.

[0059] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A mud-skin removal mechanism for ultra-long steel casings in large-diameter composite pile foundations in sandy strata, comprising a steel casing (1), characterized in that: The steel casing (1) is equipped with a vertical reciprocating mud cleaning mechanism (2), a circumferential rotating mud cleaning mechanism (3), a power linkage mechanism (4), and a rotating scraper mechanism (5). The vertical reciprocating mud cleaning mechanism (2) includes a cleaning steel brush (21), which realizes the action of the cleaning steel brush (21) reciprocating in the vertical direction to clean the mud on the inner wall of the steel casing (1); the vertical reciprocating mud cleaning mechanism (2) includes a drill bit (22), the arc surface of the drill bit (22) is inclined, the bottom of the drill bit (22) is slidably inserted into the inner wall of the steel casing (1), the inclined arc surface of the drill bit (22) is respectively provided with a dust collection groove (23) and an inclined sliding groove (24), and the multiple inclined sliding grooves (24) are arranged in a ring equally about the axis of the drill bit (22), and the dust collection groove (23) is located at the bottom of the multiple inclined sliding grooves (24); A bearing seat (216) is fixedly installed on the top of the drill bit (22). Multiple bearing seats (216) are arranged in a ring on the top of the drill bit (22). A driven shaft (217) is rotatably connected to the surface of the bearing seat (216) through a bearing. A small bevel tooth (218) is fixedly installed on one end of the driven shaft (217), and a cam (219) and a conversion bevel tooth (220) are fixedly installed on the other end of the driven shaft (217). The circumferential rotation cleaning mechanism (3) enables the cleaning steel brush (21) to perform circumferential motion around the axis of the steel casing (1) to clean the mud on the inner wall of the steel casing (1); The power linkage mechanism (4) enables the vertical reciprocating mud cleaning mechanism (2) and the rotary scraper mechanism (5) to drive the cleaning action synchronously; the power linkage mechanism (4) includes a linkage plate (41), the surface of the linkage plate (41) is rotatably connected to a linkage shaft (42) through a bearing, the bottom of the linkage shaft (42) is fixedly installed with a linkage bevel tooth (43), the tooth groove of the linkage bevel tooth (43) meshes with the gear teeth of the conversion bevel tooth (220), and the top of the linkage shaft (42) is fixedly installed with a gear (44). The rotary scraper mechanism (5) realizes the automatic scraping action of the mud clogging the surface of the cleaning steel brush (21); the rotary scraper mechanism (5) includes a turntable (51), a turntable bearing (52) is fixedly installed on the inner wall of the turntable (51), a scraper tooth (53) is fixedly installed on one side arc surface of the turntable (51), the surface of the scraper tooth (53) slides and inserts into the surface of the cleaning steel brush (21), and a toothed ring (54) is fixedly installed at the bottom of the turntable (51), the teeth of the toothed ring (54) mesh with the tooth groove of the gear (44).

2. The mud cake removal mechanism for ultra-long steel casings of large-diameter sandy layer geological composite pile foundations according to claim 1, characterized in that: A slider (25) is slidably inserted into the inner wall of the inclined groove (24). An adjustment groove (26) is provided on one side surface of the slider (25). A spring (27) is fixedly installed on the inner side wall of the adjustment groove (26). Multiple springs (27) are linearly arranged inside the adjustment groove (26). An inclined mounting block (28) is fixedly installed at one end of the multiple springs (27). One side surface of the inclined mounting block (28) is slidably inserted into the inner wall of the adjustment groove (26).

3. The mud cake removal mechanism for ultra-long steel casings in large-diameter sandy geological composite pile foundations according to claim 2, characterized in that: Annular mounting plates (29) are fixedly mounted on the surfaces of multiple inclined mounting blocks (28). The arc surface of the annular mounting plate (29) is fixedly mounted to the surface of the cleaning steel brush (21). The three annular mounting plates (29) are arranged linearly in a vertical direction. A compression spring (210) is fixedly mounted on the inner bottom wall of the inclined slide (24). The top of the compression spring (210) is fixedly mounted to the bottom of the slider (25).

4. The mud cake removal mechanism for ultra-long steel casings in large-diameter sandy geological composite pile foundations according to claim 3, characterized in that: The top of the drill bit (22) is provided with a mounting hole (211). A drive motor (212) is fixedly installed on the inner bottom wall of the mounting hole (211). The output shaft of the drive motor (212) is fixedly installed with a drive shaft (213) through a coupling. A sealing plate (214) is also fixedly installed on the inner arc side wall of the mounting hole (211). The top of the drive shaft (213) extends through and to the top of the sealing plate (214). A large bevel tooth (215) is fixedly installed on the top of the drive shaft (213).

5. The mud cake removal mechanism for ultra-long steel casings in large-diameter sandy geological composite pile foundations according to claim 4, characterized in that: The tooth grooves of the multiple small bevel teeth (218) mesh with the teeth of the large bevel teeth (215), and the surfaces of the multiple cams (219) are in contact with the top of the annular mounting plate (29).

6. The mud cake removal mechanism for ultra-long steel casings of large-diameter sand layer geological composite pile foundations according to claim 1, characterized in that: The mud-skin circumferential rotation cleaning mechanism (3) includes a drive shaft (31), a connecting seat (32) is fixedly installed at the bottom of the drive shaft (31), the bottom of the connecting seat (32) is fixedly installed with the top of the drill bit (22), the arc surface of the connecting seat (32) is provided with a relief groove (33), the three relief grooves (33) are all distributed in a ring array on the arc surface of the connecting seat (32), the driven shaft (217) is located inside the relief groove (33), and the drive shaft (31) is driven by the drive source of the drilling machine.

7. The mud cake removal mechanism for ultra-long steel casings in large-diameter sandy geological composite pile foundations according to claim 6, characterized in that: One end of the linkage plate (41) is fixedly installed on the arc surface of the connecting seat (32).

8. The mud cake removal mechanism for ultra-long steel casings of large-diameter sandy layer geological composite pile foundations according to claim 6, characterized in that: The inner ring of the turntable bearing (52) is fixedly mounted to the arc surface of the drive shaft (31).

9. The cleaning method of the mud cake removal mechanism for ultra-long steel casings in large-diameter sandy geological composite pile foundations according to any one of claims 1-8, characterized in that: Step 1: During operation, the drilling machine controls the drive shaft (31) to rotate and drive the drill bit (22) to move vertically downward inside the steel casing (1). At the same time, the drill bit (22) rotates downward and drives the cleaning steel brush (21) arranged in a ring on the surface to rotate in a circle and contact the inner wall of the steel casing (1) to clean the soil attached to the surface. Step 2: While cleaning in a circular rotation, control the drive motor (212) to work. The drive motor (212) drives the drive shaft (213) to rotate, thereby controlling the rotation of the large bevel gear (215) at the top of the drive shaft (213). With multiple small bevel gears (218) meshing with the large bevel gear (215), the multiple small bevel gears (218) are driven to rotate synchronously, causing the driven shaft (217) to rotate. The rotation of the driven shaft (217) controls the rotation of the cam (219) at one end, thereby causing the surface of the cam (219) to rotate downwards. The annular mounting plate (29) is pressed and pushed, causing its slider (25) to slide downward and squeeze the compression spring (210) at the bottom. When the lowest point of the cam (219) leaves the surface of the annular mounting plate (29), the annular mounting plate (29) is controlled to move upward under the reverse thrust of the compression spring (210). Then, the cam (219) rotates to drive the cleaning steel brush (21) to achieve reciprocating motion in the vertical state. The cleaning steel brush (21) in the reciprocating motion state, in combination with the circumferential rotation force, quickly cleans the inner wall of the steel casing (1). Step 3: During cleaning, the driven shaft (217) is rotated by the power linkage mechanism (4) and the linkage shaft (42) is driven to rotate synchronously. The top gear (44) is rotated. During the rotation of the gear (44), the gear ring (54) is controlled to rotate in a ring around the axis of the drive shaft (31). This causes the scraper teeth (53) to rotate around the axis of the drive shaft (31) and come into contact with the surface of the cleaning steel brush (21). The scraper teeth (53) scrape off the dirt accumulated on the surface of the cleaning steel brush (21) by the edge teeth of the scraper teeth (53) and make it fall off.

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