A device for reducing the thickness of the mud skin of the soil around a cast-in-place bored pile

Abstract

The present application belongs to the field of bored pile construction technology, and particularly relates to a device for reducing the thickness of the mud skin of the soil around the bored pile. The device can increase the frictional resistance between the single pile and the surrounding soil, improve the bearing capacity and stability of the single pile, and comprises a base, two wheels rotatably installed on the lower part of one side of the base, a circular sleeve installed on the other side of the base, a pile body slidably installed on the circular sleeve, at least two nozzles installed on the lower part of the pile body, at least two first mounting blocks installed on the lower part of the pile body, and a scraping ring installed between the top parts of the first mounting blocks. Workers pour mud into the pile body, the mud in the pile body is sprayed on the inner wall of the pile hole through the nozzles, so that a layer of mud skin is formed on the inner wall of the pile hole, and the scraping ring can scrape off the excess mud, thereby reducing the thickness of the mud skin.

Description

Technical Field

[0001] This invention belongs to the field of bored pile construction technology, and particularly relates to a device for reducing the thickness of mud cake in the soil around a bored pile. Background Technology

[0002] During the construction of bored piles, drilling mud is sprayed onto the inner wall of the pile hole, forming a mud cake. Due to variations in the spraying time and soil properties, the mud cake can range in thickness from a few millimeters to tens of millimeters. The mud cake serves several purposes: suspending drill cuttings, cooling the drill bit, lubricating the drilling tools, increasing hydrostatic pressure, preventing seepage inside and outside the hole, and preventing pile collapse. However, an excessively thick mud cake alters the interaction between the pile and the soil, affecting the direct bond between the pile and the surrounding soil, leading to a decrease in lateral friction resistance and consequently impacting the pile's bearing capacity and stability.

[0003] Therefore, it is necessary to invent a device that can increase the frictional resistance between a single pile and the surrounding soil, improve the bearing capacity and stability of the single pile, and reduce the thickness of the mud cake around the bored pile to solve the above problems. Summary of the Invention

[0004] To overcome the drawback that excessive mud cake reduces the side friction resistance of a single pile, thus affecting its bearing capacity and stability, the technical problem to be solved is to provide a device that can increase the friction resistance between the single pile and the surrounding soil, thereby improving the bearing capacity and stability of the single pile by reducing the thickness of the mud cake around the bored pile.

[0005] The technical solution is as follows: a device for reducing the thickness of mud cake in the soil around a bored cast-in-place pile, comprising: a base; two wheels, each rotatably mounted on the lower part of one side of the base; two fixed columns, each mounted on the top of one side of the base; a circular sleeve mounted on the other side of the base; a pile body slidably mounted on the circular sleeve; at least two nozzles, each mounted on the lower part of the pile body; at least two first mounting blocks, each mounted on the lower part of the pile body; a scraper ring mounted between the tops of the first mounting blocks; a feeding mechanism mounted on the upper part of one side of the pile body; and a lifting mechanism mounted between the base and the pile body, the lifting mechanism being used to move the pile body up and down.

[0006] As a further preferred embodiment, the feeding mechanism includes: a cover plate, installed on the upper part of one side of the pile body; two first vertical rods, both installed on the upper part of the cover plate; a locking block, slidably installed between the two first vertical rods, the locking block being slidably connected to the cover plate and cooperating with the pile body; and two first springs, both installed between the first vertical rods and the locking block.

[0007] As a further preferred embodiment, the lifting mechanism includes: a cylindrical tube mounted on the top of the other side of the base; a housing mounted on the top of the cylindrical tube; an outer casing mounted on the top of the housing; a geared motor mounted on the upper part of the housing; a pinion gear mounted on the output shaft of the geared motor, the pinion gear being located inside the housing; an annular guide rail mounted on one side of the bottom inside the housing; a large gear rotatably mounted on the annular guide rail, the large gear meshing with the pinion gear; mounting columns, at least two mounting columns, all mounted on one side of the top inside the housing; a ring mounted between the bottoms of the three mounting columns; a first nut mounted on the bottom of the ring; a lead screw mounted on the first nut, the bottom of the lead screw connected to the top of the pile body; and a bushing mounted at the center of the large gear via an overrunning clutch, the bushing being slidably connected to the lead screw.

[0008] As a further preferred embodiment, a pushing mechanism is also included, comprising: an annular frame mounted on the top of the pile body; a hose mounted on the annular frame, the hose having a one-way valve; a piston slidably mounted on the upper part of the pile body; and a second spring mounted between the piston and the top of the pile body.

[0009] As a further preferred embodiment, an air intake mechanism is also included, comprising: a second mounting block, mounted at an eccentric position on the large gear; an annular cylinder, mounted between the tops of the second mounting blocks, with the end of the hose passing through the large gear and connecting to the annular cylinder; a protrusion, mounted on one side of the annular cylinder; a first stop block, mounted on one side inside the annular cylinder; at least two second vertical rods, all mounted on the top of the housing; at least two sliding sleeves, all slidably mounted on the second vertical rods; at least two third springs, all mounted between the sliding sleeves and adjacent second vertical rods; a first connecting plate, mounted between the tops of the four second vertical rods; at least two connecting blocks, all mounted on the sliding sleeves; a push plate, mounted between the connecting blocks, slidingly engaging with the annular cylinder; and a contact rod, mounted on one side of the push plate, engaging with the protrusion.

[0010] As a further preferred embodiment, an air collection mechanism is also included, comprising: at least two air intake pipes, all installed on one side of the top of the housing; at least two slide rods, all slidably installed inside the air intake pipes; at least two second stops, all installed at the bottom of the slide rods, and the second stops slidably engage with the air intake pipes; at least two fourth springs, all installed between the slide rods and the top of the adjacent air intake pipes; at least two cylindrical sleeves, all installed on the top of the slide rods; and a connecting rod installed between the cylindrical sleeves, the connecting rod engaging with the push plate.

[0011] As a further preferred embodiment, a collection mechanism is also included, comprising: a mounting base installed at the bottom of the pile; a second nut installed at the bottom of the mounting base; a screw installed on the second nut; a collection cylinder installed at the bottom of the screw; two rotating plates, each rotatably installed on both sides of the lower part of the collection cylinder; two crossbars, each installed on both sides of the upper part of the collection cylinder; two sliding plates, each slidably installed on the crossbars; two fifth springs, each installed between the sliding plates and the adjacent crossbars; and two second connecting plates, each rotatably installed between the sliding plates and the adjacent rotating plates.

[0012] As a further preferred option, two grooves are opened on one side of the annular cylinder.

[0013] The present invention has the following advantages: 1. The workers pour mud into the pile body, and the mud in the pile body is sprayed onto the inner wall of the pile hole through the nozzle, so that a mud skin is formed on the inner wall of the pile hole. At the same time, the scraper ring can scrape off the excess mud, thereby reducing the thickness of the mud skin.

[0014] 2. The worker pulls the locking block downwards to release it from the pile body, then rotates the cover plate downwards to open it and add mud. After adding mud, the worker pushes the cover plate upwards and rotates it, then locks the pile body with the locking block. This makes it easier for the worker to add mud.

[0015] 3. The rotation of the output shaft of the geared motor causes the lead screw to rotate. As the lead screw rotates, it moves downward, which in turn causes the pile body to move downward and enter the pile hole to inject mud. At the same time, the rotation of the pile body can make the mud spray more even.

[0016] 4. Air from the hose enters the pile body, which in turn compresses the piston to slide downwards, pushing out the mud from the pile body and improving the mud injection efficiency. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0018] Figure 2 This is a partial three-dimensional structural schematic diagram of the present invention.

[0019] Figure 3 This is a schematic diagram of the first three-dimensional structure of the feeding mechanism of the present invention.

[0020] Figure 4 This is a schematic diagram of a second three-dimensional structure of the feeding mechanism of the present invention.

[0021] Figure 5 This is a schematic diagram of the first three-dimensional structure of the lifting mechanism of the present invention.

[0022] Figure 6 This is a schematic diagram of a second three-dimensional structure of the lifting mechanism of the present invention.

[0023] Figure 7 This is a three-dimensional structural diagram of the actuating mechanism of the present invention.

[0024] Figure 8 This is a partial three-dimensional structural diagram of the driving mechanism of the present invention.

[0025] Figure 9 This is a three-dimensional structural diagram of the air intake mechanism of the present invention.

[0026] Figure 10 This is a three-dimensional structural diagram of the first part of the air intake mechanism of the present invention.

[0027] Figure 11 This is a schematic diagram of a second part of the intake mechanism of the present invention.

[0028] Figure 12 This is a three-dimensional structural diagram of the third part of the air intake mechanism of the present invention.

[0029] Figure 13 This is a three-dimensional structural diagram of the gas collection mechanism of the present invention.

[0030] Figure 14 This is a partial three-dimensional structural diagram of the gas collection mechanism of the present invention.

[0031] Figure 15 This is a schematic diagram of the first three-dimensional structure of the collecting mechanism of the present invention.

[0032] Figure 16 This is a schematic diagram of a second three-dimensional structure of the collecting mechanism of the present invention.

[0033] The components are: 1-base, 2-wheel, 3-fixed column, 4-circular sleeve, 5-pile body, 6-nozzle, 7-first mounting block, 8-scraper ring, 9-feeding mechanism, 91-cover plate, 92-first vertical rod, 93-clamping block, 94-first spring, 10-lifting mechanism, 101-cylindrical cylinder, 102-machine housing, 103-outer shell, 104-gear motor, 105-small gear, 106-ring guide rail, 107-large gear, 108-mounting column, 109-circular ring, 1091-first nut, 1092-lead screw, 1093-shaft sleeve, 11-pushing mechanism, 111-ring frame, 112-hose, 113-piston, 114-second spring, 12-air intake mechanism. 121-Second mounting block, 122-Annular cylinder, 123-Protrusion, 124-First stop block, 125-Second vertical rod, 126-Sliding sleeve, 127-Third spring, 128-First connecting plate, 129-Connecting block, 1291-Push plate, 1292-Contact rod, 13-Gas collection mechanism, 131-Inlet pipe, 132-Sliding rod, 133-Second stop block, 134-Fourth spring, 135-Cylindrical sleeve, 136-Connecting rod, 14-Collection mechanism, 141-Mounting base, 142-Second nut, 143-Screw, 144-Collection cylinder, 145-Rotating plate, 146-Horizontal bar, 147-Slide plate, 148-Fifth spring, 149-Second connecting plate. Detailed Implementation

[0034] The present invention will be further described below with reference to specific embodiments. It should also be noted that, unless otherwise explicitly specified and limited, terms such as "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention based on the specific circumstances. Example

[0035] A device for reducing the thickness of mud cake in the soil surrounding bored cast-in-place piles, such as Figure 1-6 As shown, it includes a base 1, wheels 2, fixed columns 3, circular sleeves 4, piles 5, nozzles 6, first mounting blocks 7, scraper rings 8, feeding mechanisms 9, and lifting mechanisms 10. Wheels 2 are rotatably mounted on both the front and rear sides of the lower right side of the base 1. Fixed columns 3 are symmetrically mounted on the front and rear sides of the upper right side of the base 1. Circular sleeves 4 are mounted on the left side of the base 1. Pile bodies 5 are movably mounted on circular sleeves 4. A ring of nozzles 6 is mounted on the lower part of the pile body 5. A ring of first mounting blocks 7 is mounted on the lower part of the pile body 5. Scraper rings 8 are located between the tops of the first mounting blocks 7. Feeding mechanisms 9 are located on the upper left side of the pile body 5. Lifting mechanisms 10 are located between the base 1 and the pile body 5.

[0036] When using the device, the operator opens the feeding mechanism 9 and pours the mud into the pile body 5. After completion, the operator closes the feeding mechanism 9. Then, the operator connects the device to other moving devices via the fixed column 3. The other moving devices drive the device to move. When the device moves to the appropriate position, the operator uses the lifting mechanism 10 to drive the pile body 5 into the pile hole. As the pile body 5 moves downward, the mud inside the pile body 5 is sprayed onto the hole wall, forming a mud skin on the inner wall of the pile hole. At the same time as the pile body 5 moves downward, the scraper ring 8 moves downward through the first mounting block 7. The scraper ring 8 moves downward to scrape off the excess mud, thereby reducing the thickness of the mud skin.

[0037] The feeding mechanism 9 includes a cover plate 91, a first vertical rod 92, a locking block 93, and a first spring 94. The cover plate 91 is rotatably provided on the upper left side of the pile body 5. Two first vertical rods 92 are provided on the upper part of the cover plate 91. A locking block 93 is slidably provided between the two first vertical rods 92. The locking block 93 is slidably connected to the cover plate 91 and cooperates with the pile body 5. A first spring 94 is wound between the first vertical rod 92 and the locking block 93.

[0038] When using the device, the worker pulls the locking block 93 and slides it downward on the first vertical rod 92. The first spring 94 deforms, and the locking block 93 slides downward and no longer locks the pile body 5. Then, the worker pushes the cover plate 91 downward to rotate and open it. Then, the worker pours mud into the pile body 5. After completion, the worker pushes the cover plate 91 upward to rotate and close it. Then, the worker releases the locking block 93. Under the action of the first spring 94 resetting, the locking block 93 slides upward and locks the pile body 5, thereby fixing the cover plate 91. In this way, it is convenient for the worker to add mud to the pile body 5.

[0039] The lifting mechanism 10 includes a cylindrical tube 101, a housing 102, an outer casing 103, a reduction motor 104, a pinion 105, an annular guide rail 106, a large gear 107, a mounting column 108, a ring 109, a first nut 1091, a lead screw 1092, and a bushing 1093. The cylindrical tube 101 is located on the top left side of the base 1. The housing 102 is located on top of the cylindrical tube 101. The outer casing 103 is located on top of the housing 102. The reduction motor 104 is located on the upper part of the housing 102. A pinion 105 is located on the output shaft of the reduction motor 104, and the pinion 105 is located inside the housing 102. An annular guide rail 106 is provided on the bottom left side of the housing 102. A large gear 107 is rotatably mounted on the annular guide rail 106. The large gear 107 meshes with the small gear 105. Three mounting posts 108 are provided on the top left side of the housing 102. A ring 109 is provided between the bottoms of the three mounting posts 108. A first nut 1091 is provided at the bottom of the ring 109. A lead screw 1092 is fitted on the first nut 1091. The bottom of the lead screw 1092 is connected to the top of the pile body 5. A bushing 1093 is provided at the center of the large gear 107 through an overrunning clutch. The bushing 1093 is slidably connected to the lead screw 1092.

[0040] When using the device, the operator starts the reduction motor 104. The output shaft of the reduction motor 104 rotates, driving the pinion 105 to rotate. The rotation of the pinion 105 drives the large gear 107 to rotate. The rotation of the large gear 107 drives the lead screw 1092 to rotate through the bushing 1093. Under the action of the first nut 1091, the lead screw 1092 moves downward while rotating. The downward movement of the lead screw 1092 causes the pile body 5 to rotate and move downward simultaneously. The pile body 5 moves downward and enters the pile hole. The rotation of the pile body 5 makes the mud slurry uniform. The mud is sprayed onto the inner wall of the pile hole. After the mud is sprayed, the work of one pile hole is completed. At this time, the worker turns off the reduction motor 104 and then uses a tool to reverse the screw 1092. Under the action of the overrunning clutch of the bushing 1093, the large gear 107 will not follow the screw 1092 to reverse. Under the action of the first nut 1091, the screw 1092 moves upward while reversing, thereby driving the pile body 5 to move upward and disengage from the pile hole. In this way, the pile body 5 can be moved up and down, which makes it convenient to spray the mud evenly onto the inner wall of the pile hole. Example

[0041] Based on Example 1, such as Figure 1 , Figure 7 , Figure 8 , Figure 9 , Figure 10 , Figure 11 , Figure 12 , Figure 13 , Figure 14 , Figure 15 and Figure 16 As shown, it also includes a pushing mechanism 11, which includes an annular frame 111, a hose 112, a piston 113, and a second spring 114. The top of the pile body 5 is provided with an annular frame 111, and the annular frame 111 is provided with a hose 112. The hose 112 is equipped with a one-way valve. The piston 113 is slidably provided in the upper part of the pile body 5, and the second spring 114 is connected between the piston 113 and the top of the pile body 5.

[0042] When using the device, the operator connects an external air pump to the end of the hose 112. When the pile 5 enters the pile hole, the operator pushes air into the hose 112 through the air pump. The air in the hose 112 enters the upper part of the pile 5 through the annular frame 111, which in turn squeezes the piston 113 to slide downward. The second spring 114 deforms, and as the piston 113 slides downward, it squeezes the mud out of the nozzle 6. After the mud is sprayed out, the pile 5 moves upward and separates from the pile hole. The operator then opens the feeding mechanism 9 to release the air in the pile 5. Under the action of the second spring 114, the piston 113 slides upward and resets. In this way, the mud can be squeezed out and sprayed out, improving the mud injection efficiency.

[0043] It also includes an air intake mechanism 12, which includes a second mounting block 121, an annular cylinder 122, a protrusion 123, a first stop block 124, a second vertical rod 125, a sliding sleeve 126, a third spring 127, a first connecting plate 128, a connecting block 129, a push plate 1291, and a contact rod 1292. Three second mounting blocks 121 are evenly spaced at an eccentric position on the large gear 107. An annular cylinder 122 is located between the tops of the second mounting blocks 121. The tail end of the hose 112 passes through the large gear 107 and connects to the annular cylinder 122. Two grooves are opened on the right side of the annular cylinder 122, and a protrusion is provided on the right side of the annular cylinder 122. 123. A first stop block 124 is provided on the right side inside the annular cylinder 122. Four second vertical rods 125 are provided on the top of the housing 102. Each second vertical rod 125 is slidably provided with a sliding sleeve 126. A third spring 127 is wound between the sliding sleeve 126 and the adjacent second vertical rod 125. A first connecting plate 128 is provided between the tops of the four second vertical rods 125. Each sliding sleeve 126 is provided with a connecting block 129. A push plate 1291 is provided between the connecting blocks 129. The push plate 1291 is slidably engaged with the annular cylinder 122. A contact rod 1292 is provided on the right side of the push plate 1291. The contact rod 1292 is engaged with the protrusion 123.

[0044] When using the device, the rotation of the large gear 107 drives the rotation of the annular cylinder 122 via the second mounting block 121. The rotation of the annular cylinder 122 drives the rotation of the first stop block 124. Simultaneously, the first stop block 124 rotates and engages with the push plate 1291, compressing the air inside the annular cylinder 122 into the hose 112. The rotation of the annular cylinder 122 also drives the rotation of the protrusion 123. When the protrusion 123 rotates to contact the contact rod 1292, the protrusion 123 rotates and compresses the contact rod 1292 upwards. The upward movement of the contact rod 1292 causes the push plate 1291 to slide upwards in one of the grooves of the annular cylinder 122. After sliding upwards, the push plate 1291 is positioned above the annular cylinder 122, preventing contact with the first stop block 124 from affecting the rotation of the annular cylinder 122. The push plate 1291 slides upward, causing the connecting block 129 to move upward. The upward movement of the connecting block 129 causes the sliding sleeve 126 to slide upward. The third spring 127 deforms. Then, the annular cylinder 122 continues to rotate, causing the first stop block 124 to rotate and become misaligned with the push plate 1291. The protrusion 123 continues to rotate and disengages from the contact rod 1292. When the annular cylinder 122 continues to rotate, causing another groove to engage with the push plate 1291, the sliding sleeve 126, under the action of the third spring 127 resetting, drives the push plate 1291 downward through the connecting block 129 to re-enter the annular cylinder 122, thus performing the next round of air compression. In this way, air can be automatically compressed into the hose 112, eliminating the need for manual operation via an external air pump.

[0045] It also includes an air collection mechanism 13, which includes an air inlet pipe 131, a slide rod 132, a second stop block 133, a fourth spring 134, a cylindrical sleeve 135, and a connecting rod 136. An air inlet pipe 131 is provided on the top left side of the housing 102. A slide rod 132 is slidably provided inside the air inlet pipe 131. A second stop block 133 is provided at the bottom of each slide rod 132. The second stop block 133 is slidably engaged with the air inlet pipe 131. A fourth spring 134 is wound between the slide rod 132 and the top of the adjacent air inlet pipe 131. A cylindrical sleeve 135 is provided at the top of each slide rod 132. A connecting rod 136 is provided between the cylindrical sleeves 135. The connecting rod 136 is engaged with the push plate 1291.

[0046] When using the device, when the push plate 1291 slides upward to contact the connecting rod 136, the push plate 1291 slides upward to push the connecting rod 136 to move upward. The upward movement of the connecting rod 136 drives the cylindrical sleeve 135 to move upward. The upward movement of the cylindrical sleeve 135 drives the slide rod 132 to slide upward. The fourth spring 134 deforms, and the slide rod 132 slides upward to drive the second stop 133 to slide upward and no longer block the air inlet pipe 131. At this time, external air enters the annular cylinder 122 through the air inlet pipe 131, which facilitates the next round of air compression. When the push plate 1291 slides downward and disengages from the connecting rod 136, under the action of the fourth spring 134 resetting, the slide rod 132 drives the second stop 133 to slide downward to block the air inlet pipe 131. In this way, air can be automatically added to the annular cylinder 122 after each air compression is completed.

[0047] It also includes a collection mechanism 14, which includes a mounting base 141, a second nut 142, a screw 143, a collection cylinder 144, a rotating plate 145, a crossbar 146, a sliding plate 147, a fifth spring 148, and a second connecting plate 149. The bottom of the pile body 5 is provided with a mounting base 141, and the bottom of the mounting base 141 is provided with a second nut 142. The second nut 142 is fitted with a screw 143. The bottom of the screw 143 is provided with a collection cylinder 144. The lower front and rear sides of the collection cylinder 144 are rotatably provided with rotating plates 145. The upper front and rear sides of the collection cylinder 144 are provided with crossbars 146. The crossbars 146 are slidably provided with sliding plates 147. The sliding plates 147 and the adjacent crossbars 146 are all connected by a fifth spring 148. The sliding plates 147 and the adjacent rotating plates 145 are all rotatably connected by a second connecting plate 149.

[0048] When using this device, the pile body 5 moves downward, which in turn drives the second nut 142 downward via the mounting base 141. The downward movement of the second nut 142 drives the screw 143 downward, thereby causing the collecting cylinder 144 to move downward and enter the pile hole. During mud injection, the mud scraped off by the scraper ring 8 falls into the collecting cylinder 144 for collection. After the pile body 5 moves upward and the collecting cylinder 144 disengages from the pile hole, the worker can pull the sliding plate 147 to slide backward on the crossbar 146. The fifth spring 148 deforms, and the sliding plate 147... 7. The back-sliding mechanism drives the rotating plate 145 to rotate and open via the second connecting plate 149, allowing the mud in the collection cylinder 144 to flow out. After completion, the operator releases the sliding plate 147, and under the reset action of the fifth spring 148, the sliding plate 147 slides towards the opposite side, causing the rotating plate 145 to close. When the equipment needs to be moved, the operator can remove the screw 143 from the second nut 142 according to the ground conditions, and then remove the collection cylinder 144 to avoid affecting the movement of the equipment. In this way, excess mud can be collected.

[0049] The above embodiments are provided for those skilled in the art to implement or use the present invention. Those skilled in the art can make various modifications or changes to the above embodiments without departing from the inventive concept of the present invention. Therefore, the protection scope of the present invention is not limited to the above embodiments, but should be the maximum scope that conforms to the innovative features mentioned in the claims.

Claims

1. A device for reducing the thickness of mud cake in the soil surrounding a bored cast-in-place pile, characterized in that, Including: Base (1); There are two wheels (2), both of which are rotatably mounted on the lower part of one side of the base (1); There are two fixed columns (3), both of which are installed on the top of one side of the base (1); The round sleeve (4) is installed on the other side of the base (1); The pile body (5) is slidably installed on the round sleeve (4); There are at least two nozzles (6), both of which are installed at the bottom of the pile body (5); The first mounting block (7) is at least two, both of which are installed on the lower part of the pile body (5); Scraper ring (8) is installed between the tops of the first mounting blocks (7); The feeding mechanism (9) is installed on the upper part of one side of the pile body (5); The lifting mechanism (10) is installed between the base (1) and the pile (5). The lifting mechanism (10) is used to drive the pile (5) to move up and down. The lifting mechanism (10) includes: A cylindrical tube (101) is installed on the top of the other side of the base (1); The housing (102) is mounted on top of the cylindrical tube (101); The outer casing (103) is mounted on top of the housing (102); A geared motor (104) is mounted on the upper part of the housing (102); The pinion (105) is mounted on the output shaft of the geared motor (104) and is located inside the housing (102); A ring-shaped guide rail (106) is installed on one side of the bottom inside the housing (102); The large gear (107) is rotatably mounted on the annular guide rail (106), and the large gear (107) meshes with the small gear (105); There are three mounting posts (108), all of which are installed on the top side inside the housing (102); A ring (109) is installed between the bottoms of three mounting posts (108); The first nut (1091) is installed at the bottom of the ring (109); The lead screw (1092) is installed on the first nut (1091), and the bottom of the lead screw (1092) is connected to the top of the pile body (5); The bushing (1093) is installed at the center of the large gear (107) via an overrunning clutch, and the bushing (1093) is slidably connected to the lead screw (1092); It also includes a promoting agency (11), which includes: The ring frame (111) is installed on top of the pile body (5); A hose (112) is mounted on an annular frame (111) and has a check valve; Piston (113) is slidably installed inside the upper part of the pile body (5); The second spring (114) is installed between the piston (113) and the top of the pile body (5); It also includes an air intake mechanism (12), which includes: The second mounting block (121) is installed at the eccentric position of the large gear (107); An annular cylinder (122) is installed between the tops of the second mounting blocks (121). The end of the hose (112) passes through the large gear (107) and connects to the annular cylinder (122). Two grooves are opened on one side of the annular cylinder (122). A protrusion (123) is installed on one side of the annular cylinder (122). The first stop (124) is installed on one side inside the annular cylinder (122); There are at least two second vertical rods (125), both of which are installed on the top of the housing (102); Sliding sleeve (126), there are at least two sliding sleeves (126), both of which are slidably installed on the second vertical rod (125); The third spring (127), there are at least two third springs (127), both of which are installed between the sliding sleeve (126) and the adjacent second vertical rod (125); The first connecting plate (128) is installed between the tops of the four second vertical bars (125); Connecting block (129), there are at least two connecting blocks (129), both of which are installed on the sliding sleeve (126); A push plate (1291) is installed between connecting blocks (129), and the push plate (1291) slides in conjunction with the annular cylinder (122); The contact rod (1292) is installed on one side of the push plate (1291), and the contact rod (1292) cooperates with the protrusion (123); It also includes a gas collecting mechanism (13), which includes: There are at least two intake pipes (131), both of which are installed on one side of the top of the housing (102); There are at least two slide rods (132), both of which are slidably installed inside the intake pipe (131); The second stop (133) has at least two parts, both of which are installed at the bottom of the slide bar (132). The second stop (133) is slidably engaged with the air intake pipe (131). The fourth spring (134) is at least two, both of which are installed between the top of the slide rod (132) and the adjacent air intake pipe (131); Cylindrical sleeve (135), there are at least two cylindrical sleeves (135), all of which are installed on the top of the slide bar (132); A connecting rod (136) is installed between cylindrical sleeves (135), and the connecting rod (136) cooperates with the push plate (1291).

2. The device for reducing the thickness of mud cake in the soil around a bored cast-in-place pile as described in claim 1, characterized in that, The feeding mechanism (9) includes: Cover plate (91) is installed on the upper part of one side of the pile body (5); There are two first vertical rods (92), both of which are installed on the upper part of the cover plate (91); The locking block (93) is slidably installed between the two first vertical rods (92). The locking block (93) is slidably connected to the cover plate (91). The locking block (93) cooperates with the pile body (5). There are two first springs (94), both of which are installed between the first vertical rod (92) and the locking block (93).

3. The device for reducing the thickness of mud cake in the soil around a bored cast-in-place pile as described in claim 2, characterized in that, It also includes a collection agency (14), which includes: Mounting base (141) is installed at the bottom of pile body (5); The second nut (142) is installed at the bottom of the mounting base (141); The screw (143) is mounted on the second nut (142); A collection cylinder (144) is installed at the bottom of the screw (143); There are two rotating plates (145), both of which are rotatably installed on both sides of the lower part of the collection cylinder (144); There are two crossbars (146), both of which are installed on the upper sides of the collection tube (144); Skateboard (147), there are two skateboards (147), both of which are slidably mounted on the crossbar (146); The fifth spring (148) consists of two springs, both of which are installed between the slide plate (147) and the adjacent crossbar (146); There are two second connecting plates (149), both of which are rotatably installed between the slide plate (147) and the adjacent rotating plate (145).

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