A pile foundation construction drilling device and a construction method thereof

Abstract

The present application relates to the technical field of pile foundation construction, and specifically discloses a drilling device for pile foundation construction and a construction method thereof, which comprises a drill cylinder and a baffle, the bottom of the drill cylinder is rotationally assembled with a bottom plate, and the drill cylinder is provided with a cleaning assembly and a control assembly for fixing the bottom plate in cooperation with the bottom plate; the control assembly comprises a control rod which is assembled in the drill cylinder in sliding manner up and down, and the control rod is located below the baffle; the cleaning assembly comprises a scraping ring and an intermediate piece, the scraping ring is in abutment with the inner wall of the drill cylinder and is assembled in the drill cylinder in sliding manner up and down, and the scraping ring is connected with the control rod through the intermediate piece; when the drill cylinder moves upward to drive the control rod to abut against the baffle, the baffle drives the control rod to move relative to the drill cylinder to open the bottom of the drill cylinder, and at the same time, the control rod drives the scraping ring to move upward through the intermediate piece to form a gap between the soil and the inner wall of the drill cylinder; the drilling device for pile foundation construction and the construction method thereof have the effect of improving the drilling efficiency.

Description

Technical Field

[0001] This invention relates to the technical field of pile foundation construction, and specifically to a drilling device and construction method for pile foundation construction. Background Technology

[0002] During pile foundation construction, drilling equipment is required to deepen the pile foundation. The cavities formed by drilling allow the pile to fit tightly into the surrounding soil, increasing frictional resistance, improving resistance to settlement and lateral displacement, and ensuring the quality of pile formation. There are many types of drilling equipment used for pile foundation construction, among which rotary drilling rigs are common drilling devices. Their drilling speed is several times that of traditional circulating drilling rigs, and they produce high-quality holes, which can significantly reduce the construction cycle.

[0003] Patent document CN118686543B discloses a rotary drilling rig for drilling holes in building pile foundations, including a body, a boom, a first drive device, a transmission rod, and a drill barrel. The first drive device moves along the boom; the first drive device drives the transmission rod to rotate; the drill barrel is detachably mounted on the transmission rod via a limiting component; the drill barrel rotates synchronously with the transmission rod; the drill barrel has a through hole that penetrates the drill barrel along its axial direction, and the transmission rod passes through the through hole. The drill barrel is detachably connected to the second end of the transmission rod; the drill barrel includes a barrel body and a base plate. The drill barrel has an internal storage space for the through hole and unlocking assembly. This space exchanges material with the outside environment through a base plate and a gap between the base plate and the barrel. The internal storage space is used to store soil. The base plate is located at the bottom of the drill barrel and is rotatably connected to the barrel. The base plate has the function of drilling and sending the drilled soil into the internal storage space. The base plate can be opened and closed to store and release soil. The through hole extends through the drill barrel along its axial direction. The drill barrel and the drive rod rotate synchronously and can slide relative to each other along the axial direction of the drill barrel. The drive rod is located inside the through hole. The unlocking assembly is located on the barrel and controls the opening and closing of the base plate.

[0004] When drilling, soil enters the internal space of the drill barrel. After a single operation is completed, the drill barrel is removed from the hole. Then, the restriction on the base plate is released by the unlocking component, the base plate is opened, and the soil inside the drill barrel is discharged.

[0005] However, this method also has the following problems. During drilling, in order to ensure the stability and construction efficiency of the borehole, drilling mud needs to be injected to form a dense mud cake on the borehole wall, blocking groundwater seepage and balancing the lateral pressure of the strata through hydrostatic pressure to prevent loose soil layers. However, the mixing of drilling mud and soil during drilling results in the soil entering the drill tube being highly viscous. When the bottom plate is opened, the soil adheres to the inner wall of the drill tube, making it difficult for the soil to fall out of the drill tube or to fall out completely. This requires repeatedly shaking the drill tube up and down, which is a cumbersome process and affects drilling efficiency. Summary of the Invention

[0006] This invention provides a drilling device and construction method for pile foundation construction, aiming to solve the problem in related technologies where soil easily adheres to the inner wall of the drill cylinder, making it inconvenient to remove the soil from the drill cylinder and thus affecting drilling efficiency.

[0007] In a first aspect, the present invention provides a drilling device for pile foundation construction, comprising a drill cylinder mounted on a frame, a baffle plate located above the drill cylinder, a base plate rotatably mounted on the bottom of the drill cylinder, and a cleaning component and a control component that cooperates with the base plate and is used to fix the base plate inside the drill cylinder; the control component includes a control rod that is slidably mounted inside the drill cylinder and is located below the baffle plate; the cleaning component includes a scraper ring and an intermediate component, the scraper ring abutting against the inner wall of the drill cylinder and slidably mounted inside the drill cylinder, the scraper ring being connected to the control rod through the intermediate component; when the drill cylinder moves upward and causes the control rod to abut against the baffle plate, the baffle plate causes the control rod to move relative to the drill cylinder, releasing the restriction on the base plate to open the bottom of the drill cylinder, and at the same time the control rod causes the scraper ring to move upward through the intermediate component to form a gap between the soil and the inner wall of the drill cylinder.

[0008] Its effect lies in the fact that, by setting up cleaning and control components, after drilling is completed, the two work together to remove the soil from the drill barrel. Specifically, after drilling is completed, soil enters the drill barrel and needs to be cleaned. The drill barrel is moved upward to approach the baffle, so that the control rod abuts against the baffle. This causes the control rod to move downward relative to the drill barrel. When the control rod moves, it releases the restriction on the bottom plate, allowing the bottom plate to rotate under its own weight and open the bottom of the drill barrel. Then, the control rod drives the scraper ring upward through the intermediate component. As the scraper ring passes between the soil and the side wall of the drill barrel, a gap is formed between the soil and the side wall of the drill barrel, preventing the soil from sticking too much to the inner wall of the drill barrel. This reduces the friction between the two, making it easier for the soil to fall out of the drill barrel, achieving rapid soil removal and improving drilling efficiency.

[0009] Preferably, the control lever has a rack 1 arranged vertically on its side, and the intermediate components include a gear set and a slide rod. The slide rod is slidably assembled inside the drill barrel, and the lower end of the slide rod is connected to the scraper ring. The slide rod has a rack 2 arranged vertically on its side. The gear set meshes with both rack 1 and rack 2 so that when the control lever moves downward, it drives the slide rod to move upward.

[0010] Its effect is that when the control lever moves, it drives rack one to move synchronously. Rack one drives rack two to move through the gear set. Rack two drives the slide rod to move, thereby adjusting the position of the scraper ring, so that an annular gap is formed between the soil and the drill barrel from bottom to top, so that the soil can be discharged from the drill barrel.

[0011] Preferably, the inner side of the scraper ring is provided with a guide slope, the scraper ring and the slide rod are rotatably engaged, the scraper ring is rotatably arranged around the center of the drill barrel, a slide groove is opened on the inner wall of the drill barrel, the slide rod is slidably assembled in the slide groove, a guide groove is opened on the side wall of the slide groove along the vertical direction, the guide groove is corrugated, a middle groove is opened through the slide rod, a guide rod is provided on the side of the scraper ring, the guide rod passes through the middle groove and is slidably engaged with the guide groove, and when the guide rod moves in the guide groove, it drives the scraper ring to reciprocate.

[0012] Its effect is that when the slide bar moves the scraper ring upward, the guide rod moves in the guide groove. Because the guide groove is corrugated, the scraper ring will rotate accordingly. That is, the scraper ring moves upward while rotating back and forth, so that the scraper ring moves upward and helps to separate the soil from the side wall of the drill barrel.

[0013] Preferably, the control rod includes an inner rod and a sleeve rod. The sleeve rod is slidably mounted on the drill barrel, and the inner rod is slidably mounted inside the sleeve rod, with the upper end of the inner rod extending to the outside of the sleeve rod. A spring element 1 connected to the drill barrel is sleeved on the outside of the sleeve rod, and a spring element 2 connected to the sleeve rod is sleeved on the outside of the inner rod. The spring element 1 is used to drive the sleeve rod to move upward, and the spring element 2 is used to drive the inner rod to move upward. The elastic force of the spring element 2 is greater than that of the spring element 1. A rack is set on the inner rod. When the inner rod cooperates with the baffle, it drives the sleeve rod to move downward. When the sleeve rod stops moving, it releases the restriction on the bottom plate. Subsequently, the inner rod moves relative to the sleeve rod, driving the slide rod to move through the rack.

[0014] Its effect is that the movement of the inner rod drives the movement of the sleeve rod, thereby releasing the restriction on the base plate. Simultaneously, the movement of the sleeve rod compresses the first spring, after which the sleeve rod stops moving. The inner rod then moves relative to the sleeve rod, driving the slide rod via the first rack to adjust the position of the scraper ring. Furthermore, after the soil is discharged, the inner rod separates from the baffle, and the first and second springs respectively drive the sleeve rod and inner rod to reset, allowing for the next operation to be repeated.

[0015] Preferably, a clearance groove is provided on the side of the sleeve rod, and the gear set engages with the rack through the clearance groove. The inner rod drives the sleeve rod to move downward synchronously. After the sleeve rod stops moving, the inner rod drives the rack to move to engage with the gear set.

[0016] Its effect is that the gear set cooperates with the rack through the clearance groove, and after the sleeve stops moving, the rack and gear set cooperate, reducing the phenomenon of the sleeve interfering with the cooperation between the rack and gear set.

[0017] Preferably, a top plate is slidably mounted inside the drill barrel, with the top plate positioned near the top of the drill barrel. An elastic telescopic rod is provided between the top plate and the drill barrel to connect the two. The elastic telescopic rod is used to drive the top plate to move upward. A jacking assembly is provided inside the drill barrel, and a push block is provided on the sliding rod. When the sliding rod drives the scraper ring to move upward to the top plate, the push block and the jacking assembly cooperate to drive the top plate to move downward, so as to push out the soil inside the drill barrel.

[0018] Preferably, the pusher assembly includes: a top pressure plate rotatably assembled inside the drill barrel and a pusher plate slidably assembled inside the drill barrel. The top pressure plate is located above the top plate. The top pressure plate includes a telescopic part. The upper end of the pusher plate is rotatably connected to the telescopic part. The lower end of the pusher plate corresponds to the push block. When the push block moves upward and abuts against the pusher plate, it drives the top pressure plate to rotate.

[0019] Preferably, the gear set includes: gear one, gear two, gear three, and gear four. Gear one and gear three have the same diameter, and the diameters of gear one, gear two, and gear four increase sequentially. Gear one and gear two are coaxially connected, gear three and gear four are coaxially connected, gear two and gear three mesh, gear one meshes with rack one, and gear four meshes with rack two.

[0020] Preferably, the control assembly further includes a locking rod, a first connecting rod, and a second connecting rod. A sleeve is provided on the side of the base plate near the inside of the drill barrel. The locking rod is rotatably assembled inside the drill barrel, and the lower end of the locking rod is engaged with the sleeve to fix the base plate. The first connecting rod is rotatably engaged with the lower end of the sleeve. One end of the second connecting rod is rotatably connected to the first connecting rod, and the other end is fixedly connected to the upper end of the locking rod. The sleeve moves downward and drives the locking rod to rotate through the first connecting rod and the second connecting rod, so that the lower end of the locking rod separates from the sleeve and releases the restriction on the base plate.

[0021] Secondly, the present invention provides a drilling method for pile foundation construction, employing the aforementioned drilling device for pile foundation construction, comprising the following steps:

[0022] After removing the drill barrel from the hole, continue moving the drill barrel upwards, causing the inner rod to come into contact with the baffle.

[0023] The movement of the inner rod first causes the movement of the sleeve rod, releasing the restriction on the base plate and opening the bottom of the drill barrel;

[0024] After the base plate is opened, the sleeve rod stops moving, and the inner rod continues to move, driving the sliding rod and scraper ring to move upward, so that the scraper ring passes between the soil and the drill barrel side wall to form a gap between the soil and the drill barrel side wall.

[0025] After the scraper ring moves above the drill barrel, the pusher block and the top pusher plate work together to drive the top pressure plate to rotate and press down on the top plate, which then pushes the soil out of the drill barrel.

[0026] The effect is that during the process, the drill barrel only needs to move upwards towards the baffle, first moving the sleeve rod and releasing the restriction on the bottom plate, thus opening the bottom of the drill barrel. Then, it moves the slide rod, which in turn moves the scraper ring upwards, so that the soil inside the drill barrel separates from the side wall of the drill barrel, making it easier for the soil to be discharged from the drill barrel and improving drilling efficiency.

[0027] Beneficial effects:

[0028] When the drilling is completed and the soil inside the drill barrel needs to be discharged, the drill barrel is moved upwards, causing the inner rod to engage with the baffle. This causes the inner rod to move the sleeve rod and the sliding rod in sequence. The movement of the sleeve rod releases the restriction on the bottom plate, opening the bottom of the drill barrel. As the sliding rod moves, it drives the scraper ring to move upwards, passing between the soil and the inner wall of the drill barrel. This creates a gap between the soil and the inner wall of the drill barrel, reducing the adhesion between the soil and the side wall of the drill barrel. As a result, the soil is discharged from the drill barrel under its own weight, thereby improving drilling efficiency. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0030] Figure 2 This is a schematic diagram of the internal structure of the drill barrel in this invention.

[0031] Figure 3 yes Figure 2 A schematic diagram of the structure at point A in the middle.

[0032] Figure 4 yes Figure 2 A schematic diagram of the structure at point B.

[0033] Figure 5 This is a schematic diagram of the gear set in this invention.

[0034] Figure 6 This is a schematic diagram of the control component in this invention.

[0035] Figure 7 This is a schematic diagram of the cleaning component in this invention.

[0036] Figure 8 This is a schematic diagram of the top pressure plate in this invention.

[0037] Figure 9 This is a schematic diagram of the linkage mechanism in this invention.

[0038] Figure 10 This is a partial exploded view of the scraper ring and slide bar in this invention.

[0039] Figure 11 This is a schematic diagram showing the relationship between the guide rod and the intermediate groove in this invention.

[0040] Figure label:

[0041] 1. Frame; 11. Baffle; 12. Top plate; 13. Elastic telescopic rod; 14. Linkage rod; 2. Drill barrel; 21. Mounting plate; 22. Mounting shell; 3. Base plate; 31. Sleeve; 4. Cleaning assembly; 41. Scraper ring; 411. Guide bevel; 412. Guide rod; 42. Intermediate component; 421. Gear set; 422. Slide rod; 423. Rack two; 424. Gear one; 425. Gear two; 426. Gear 3; 427, Gear 4; 428, Intermediate groove; 429, Push block; 5, Control assembly; 51, Control rod; 511, Inner rod; 512, Sleeve rod; 513, Relief groove; 52, Locking rod; 53, Connecting rod 1; 54, Connecting rod 2; 6, Rack 1; 7, Spring 1; 71, Spring 2; 8, Slide groove; 81, Guide groove; 9, Pushing assembly; 91, Top pressure plate; 911, Telescopic part; 92, Pushing plate. Detailed Implementation

[0042] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0043] This invention discloses a drilling device for pile foundation construction.

[0044] Reference Figures 1 to 11 The drilling device for pile foundation construction includes a drill cylinder 2 installed on a frame 1. A baffle 11 is provided on the frame 1, located above the drill cylinder 2. A base plate 3 is provided at the bottom of the drill cylinder 2, and the base plate 3 is rotatably connected to the drill cylinder 2 to control the closure of the bottom of the drill cylinder 2. A cleaning component 4 and a control component 5 are provided inside the drill cylinder 2. The control component 5 is connected to the base plate 3 and is used to fix the position of the base plate 3. The cleaning component 4 cooperates with the control component 5. When the control component 5 releases the restriction on the base plate 3, the cleaning component 4 assists in discharging the soil inside the drill cylinder 2.

[0045] After a single drilling operation is completed, the soil enters the drill barrel 2. Then, the drill barrel 2 is moved out of the hole and then continues to move upward so that the control component 5 cooperates with the baffle 11. Then, the control component 5 releases the restriction on the bottom plate 3, and the bottom plate 3 rotates and opens. Then, the control component 5 cooperates with the cleaning component 4. Under the action of the cleaning component 4, the soil in the drill barrel 2 is discharged.

[0046] Reference Figure 2 , Figure 3 , Figure 7The control assembly 5 includes: a control rod 51, a locking rod 52, a first connecting rod 53, and a second connecting rod 54. The control rod 51 is arranged vertically, that is, the control rod 51 is parallel to the axis of the drill barrel 2. The control rod 51 is slidably mounted inside the drill barrel 2. The upper end of the control rod 51 is located outside the drill barrel 2 and corresponds to the baffle 11. A retaining sleeve 31 is provided on the side of the base plate 3, which is located on the side of the base plate 3 near the inside of the drill barrel 2. The locking rod 52 is rotatably mounted on the inner wall of the drill barrel 2. The lower end of the locking rod 52 has a hook-shaped structure and is engaged with the retaining sleeve 31. One end of the first connecting rod 53 is rotatably connected to the lower end of the control rod 51, and the other end is rotatably connected to the second connecting rod 54. The end of the second connecting rod 54 opposite to the first connecting rod 53 is rotatably connected to the upper end of the locking rod 52.

[0047] During drilling, the base plate 3 rotates until it is flush with the bottom of the drill barrel 2, meaning the base plate 3 is in a horizontal state. The ferrule 31 rotates into the drill barrel 2, and the lower end of the clamping rod 52 engages with the ferrule 31, thus fixing the base plate 3. When the drill barrel 2 moves upward, it causes the control rod 51 to come into contact with the baffle 11, and simultaneously causes the control rod 51 to move downward relative to the drill barrel 2. As the control rod 51 moves, it drives the connecting rod 2 54 to rotate via the connecting rod 1 53. The rotation of the connecting rod 2 54 causes the lower end of the clamping rod 52 to rotate away from the ferrule 31, thus separating the lower end of the clamping rod 52 from the ferrule 31 and releasing the restriction on the base plate 3.

[0048] Reference Figure 2 , Figure 3 , Figure 7 The cleaning component 4 includes a scraper ring 41 and an intermediate component 42. The scraper ring 41 is disposed inside the drill barrel 2, and the outer side of the scraper ring 41 abuts against the inside of the drill barrel 2. The scraper ring 41 is slidably mounted inside the drill barrel 2. The scraper ring 41 is connected to the control rod 51 through the intermediate component 42. The scraper ring 41 is located above the first connecting rod 53 and the second connecting rod 54, and the control rod 51 is located inside the scraper ring 41 to prevent the scraper ring 41 from interfering with the rotation of the first connecting rod 53 and the second connecting rod 54.

[0049] Initially, the scraper ring 41 is positioned near the lower end of the drill barrel 2. When the control rod 51 moves relative to the drill barrel 2 in cooperation with the baffle 11, the control rod 51 drives the scraper ring 41 to move upward through the intermediate part 42 until the scraper ring 41 moves to the top of the drill barrel 2. When the scraper ring 41 moves, it passes between the soil and the side wall of the drill barrel 2, creating a gap between the soil inside the drill barrel 2 and the side wall of the drill barrel 2. This separates the soil from the inner wall of the drill barrel 2 or reduces the contact area between them, so that the soil inside the drill barrel 2 can fall out of the drill barrel 2.

[0050] Reference Figure 2 , Figure 3 , Figure 4 , Figure 5A rack 6 is provided on the side of the control lever 51, and the rack 6 is arranged along the sliding direction of the control lever 51. The intermediate component 42 includes a gear set 421 and a slide rod 422. The slide rod 422 is slidably assembled in the drill barrel 2, and the slide rod 422 is parallel to the control lever 51, and the sliding directions of the two are also parallel. The lower end of the slide rod 422 is connected to the scraper ring 41. A rack 423 is provided on the side of the slide rod 422, and the rack 423 is arranged along the length direction of the slide rod 422. The gear set 421 is arranged between the slide rod 422 and the control lever 51, and the gear set 421 meshes with both the rack 6 and the rack 423.

[0051] When the control lever 51 moves relative to the drill barrel 2, the slide bar 422 moves synchronously through the rack 6, gear set 421 and rack 423 to adjust the position of the scraper ring 41.

[0052] Reference Figure 2 , Figure 3 , Figure 4 , Figure 5 The gear set 421 includes: gear one 424, gear two 425, gear three 426, and gear four 427. A mounting shell 22 is provided outside the drill barrel 2. Gear one 424, gear two 425, gear three 426, and gear four 427 are all installed in the mounting shell 22 and rotated within the mounting shell 22. Gear one 424 and gear two 425 are coaxially arranged, gear three 426 and gear four 427 are coaxially arranged, gear two 425 meshes with gear three 426, gear one 424 meshes with rack one 6, and gear four 427 meshes with rack two 423.

[0053] When the control lever 51 moves the rack 6, the rack 6 drives the gear 424 to rotate. The gear 425 rotates synchronously with the gear 424. The gear 425 drives the gear 427 to rotate through the gear 426. The rotation of the gear 427 drives the rack 423 to move, thereby adjusting the position of the slide bar 422.

[0054] Reference Figure 5 The diameters of gear 1 424 and gear 3 426 are set to be the same, and the diameters of gear 1 424, gear 2 425 and gear 427 increase sequentially. That is, by setting different diameters, the transmission ratio of gear set 421 is changed, so that when rack 1 6 moves, rack 2 423 moves a much greater distance than rack 1 6, so that slide rod 422 drives scraper ring 41 to move to the upper end of drill barrel 2.

[0055] The upper end of the slide rod 422 extends to the outside of the drill barrel 2. The slide rod 422 and the baffle 11 are offset in the vertical direction. The slide rod 422 moves in the opposite direction to the control rod 51. By offsetting the slide rod 422 and the baffle 11, the phenomenon of the slide rod 422 abutting against the baffle 11 when it moves upward relative to the drill barrel 2 is avoided, thereby reducing the phenomenon of mutual interference between the slide rod 422 and the baffle 11.

[0056] Reference Figure 5 , Figure 9 Two sets of slide rods 422 and gear sets 421 are provided. The two sets of slide rods 422 are symmetrically arranged around the center of the scraper ring 41. A linkage rod 14 is provided between the gears 424 in the two sets of gear sets 421. The linkage rod 14 and the gears 424 are coaxially arranged, that is, the gears 424 in the two gear sets 421 are coaxially connected through the linkage rod 14 and can rotate synchronously. The linkage rod 14 drives the two slide rods 422 to move synchronously, and the two slide rods 422 simultaneously drive the scraper ring 41 to move, thereby improving the stability of the scraper ring 41 when it moves.

[0057] Reference Figure 2 , Figure 5 , Figure 6 The control lever 51 includes an inner lever 511 and a sleeve lever 512. The sleeve lever 512 is slidably mounted on the drill barrel 2. The inner lever 511 is located inside the sleeve lever 512, and the inner lever 511 and the sleeve lever 512 are in sliding engagement. The upper end of the inner lever 511 extends to the outside of the sleeve lever 512. A spring 7 is sleeved on the outside of the sleeve lever 512. The spring 7 is a spring, with one end connected to the sleeve lever 512 and the other end connected to the end of the drill barrel 2. The spring 7 is used to drive the sleeve lever 512 to move upward. A spring 71 is provided on the outside of the inner lever 511. The spring 71 is also a spring, with one end connected to the inner lever 511 and the other end connected to the sleeve lever 512. The spring 71 is used to drive the inner lever 511 to move upward relative to the sleeve lever 512. The spring force of the spring 71 is set to be greater than the spring force of the spring 7. The rack 6 is mounted on the inner rod 511, and the connecting rod 53 is rotatably connected to the lower end of the sleeve rod 512.

[0058] When the drill barrel 2 moves upward, the inner rod 511 engages with the baffle 11. The inner rod 511 drives the sleeve rod 512 downward through the second spring 71, simultaneously compressing the first spring 7. After the locking rod 52 separates from the locking sleeve 31, i.e., after the restriction on the base plate 3 is released, the sleeve rod 512 stops moving. At this time, the drill barrel 2 continues to move upward, and the inner rod 511 moves relative to the sleeve rod 512. Then, the inner rod 511 drives the sliding rod 422 to move through the first rack 6, thereby adjusting the position of the scraper ring 41. After the soil is discharged, the rotary drum moves downward, the inner rod 511 separates from the baffle 11, and the sleeve rod 512 resets under the action of the first spring 7. The inner rod 511 resets relative to the sleeve rod 512 under the action of the second spring 71, so that the position of the scraper ring 41 and the locking rod 52 can be adjusted again.

[0059] Reference Figure 6 A clearance groove 513 is provided on the side of the sleeve rod 512. The rack 6 corresponds to the clearance groove 513. The gear set 421 engages with the rack 6 through the clearance groove 513. That is, the side of the gear 424 meshes with the rack 6 through the clearance groove 513.

[0060] Initially, rack 6 separates from gear 424. As sleeve 512 moves downward, inner rod 511 moves downward synchronously. After sleeve 512 stops moving, rack 6 moves to gear 424 and meshes with it. This releases the restriction on base plate 3, allowing slide rod 422 to move scraper ring 41, so that the soil inside drill barrel 2 can be discharged in a timely manner as scraper ring 41 moves.

[0061] Reference Figure 3 A guide slope 411 is provided on the inner side of the scraper ring 41. The guide slope 411 reduces the resistance encountered by the scraper ring 41 when it moves upward, so that the scraper ring 41 can pass between the soil and the drill barrel 2 and form a gap between the soil and the drill barrel 2. At the same time, after the inner rod 511 separates from the baffle 11, the spring 7 and the spring 71 drive the sleeve rod 512 and the inner rod 511 to reset. At the same time, the scraper ring 41 is driven to reset through the sliding rod 422. When the scraper ring 41 resets downward, the lower end of the scraper ring 41 can scrape off the soil adhering to the inner wall of the drill barrel 2, thereby cleaning the inner wall of the drill barrel 2.

[0062] Reference Figure 3 , Figure 10 , Figure 11A groove 8 is provided on the inner wall of the drill barrel 2. A sliding rod 422 is slidably fitted in the groove 8, and the side of the sliding rod 422 closest to the inside of the drill barrel 2 is arc-shaped, that is, the side of the sliding rod 422 and the internal space of the drill barrel 2 are on the same arc surface, so that the outer side of the scraper ring 41 is in full contact with the inner wall of the drill barrel 2. A guide groove 81 is provided on the inner wall of the groove 8 in a vertical direction. The guide groove 81 is corrugated. A middle groove 428 is provided on the sliding rod 422 in a horizontal direction and perpendicular to the groove 8. The scraper ring 41 is rotatably connected to the sliding rod 422. A guide rod 412 is provided on the side of the scraper ring 41. The guide rod 412 extends through the middle groove 428 into the guide groove 81. The guide rod 412 is slidably engaged with the guide groove 81, and the guide rod 412 is spaced apart from the inner wall of the middle groove 428.

[0063] When the slide rod 422 moves the scraper ring 41 upward, it causes the guide rod 412 to slide within the guide groove 81. Because the guide groove 81 is corrugated, under the action of the guide groove 81 and the guide rod 412, the scraper ring 41 moves upward and rotates back and forth, so that the scraper ring 41 passes between the soil and the side wall of the drill barrel 2. At the same time, when the scraper ring 41 moves downward, it can improve the cleaning effect on the side wall of the drill barrel 2.

[0064] Reference Figure 2 , Figure 4 , Figure 7 A top plate 12 is installed inside the drill barrel 2, positioned near the top of the drill barrel 2. The top plate 12 is slidably mounted inside the drill barrel 2. An elastic telescopic rod 13 is installed above the top plate 12, arranged vertically, and is a flexible rod-shaped structure. The lower end of the elastic telescopic rod 13 is connected to the top plate 12, and the upper end is connected to the inner wall of the drill barrel 2. The elastic telescopic rod 13 is used to drive the top plate 12 to move upward. A push assembly 9 is installed inside the drill barrel 2, and a push block 429 is installed on the slide rod 422.

[0065] During drilling in drill barrel 2, soil enters drill barrel 2. As the drilling depth increases, the amount of soil in drill barrel 2 gradually increases. After a single drilling operation is completed, the soil in drill barrel 2 engages with the lower side of top plate 12. When slide rod 422 drives scraper ring 41 to move to top plate 12, it drives push block 429 to engage with push assembly 9. Push assembly 9 drives top plate 12 to move downward, thereby pushing the soil in drill barrel 2 downward and discharging the soil from drill barrel 2.

[0066] Reference Figure 4 , Figure 7 , Figure 8The push assembly 9 includes a pressure plate 91 and a push plate 92. The pressure plate 91 is located above the top plate 12 and is rotatably mounted on the inner wall of the drill barrel 2. That is, an mounting plate 21 is provided on the inner wall of the drill barrel 2. The pressure plate 91 and the mounting plate 21 are rotatably connected. The push plate 92 is slidably mounted in the drill barrel 2. The upper end of the push plate 92 is rotatably connected to the pressure plate 91, and the lower end extends to the bottom of the top plate 12. The push plate 92 and the push block 429 are arranged in the same vertical direction.

[0067] The slide bar 422 drives the push block 429 to cooperate with the push plate 92, and drives the push plate 92 to move upward. The upward movement of the push plate 92 drives the pressure plate 91 to rotate, so that the end of the pressure plate 91 away from the push plate 92 abuts against the top plate 12, thereby pushing the top plate 12 to move downward.

[0068] Reference Figure 7 , Figure 8 The top pressure plate 91 includes a telescopic part 911, which is a telescopic rod-shaped structure. The top push plate 92 is rotatably connected to the telescopic part 911. This allows the telescopic part 911 to extend and retract as the top push plate 92 drives the top pressure plate 91 to rotate, adapting to changes in the distance between the upper end of the top push plate 92 and the rotation axis of the top pressure plate 91. This reduces interference between the top push plate 92 and the top pressure plate 91.

[0069] Reference Figure 8 There are two telescopic parts 911 spaced apart. The sleeve rod 512 is located between the two telescopic parts 911 and passes through the top plate 12. The sleeve rod 512 can slide up and down in the top plate 12 to avoid interference between the telescopic parts 911 and the top plate 12.

[0070] Reference Figure 7 The push plate 92 is located close to the inner wall of the drill barrel 2, and a groove is provided on the top plate 12 at a position corresponding to the push plate 92. The lower end of the push plate 92 extends to the bottom of the top plate 12 through the groove.

[0071] There are two sets of top pressure plate 91 and top push plate 92, and the two sets of top push plates 92 are respectively set to correspond one-to-one with the two sets of slide rods 422. The top plate 12 is moved by the cooperation of the two sets of top push plates 92 and top pressure plate 91, so that the top plate 12 is evenly stressed and the stability of the top plate 12 when it moves is improved.

[0072] The implementation principle of this invention is as follows: After a single drilling is completed, the drill cylinder 2 is moved out of the hole, and then the drill cylinder 2 is moved to a designated position. Then the drill cylinder 2 continues to move upward, causing the inner rod 511 to abut against the baffle 11. The inner rod 511 causes the sleeve rod 512 to move downward. The movement of the sleeve rod 512 causes the locking rod 52 to rotate through the connecting rod 1 53 and the connecting rod 2 54, so that the locking rod 52 separates from the locking sleeve 31, releasing the restriction on the bottom plate 3, and causing the bottom plate 3 to rotate under its own weight to open the bottom of the drill cylinder 2.

[0073] As the drill barrel 2 continues to move upward, the sleeve rod 512 stops moving, and the rack 6 moves to mesh with the gear 424. The inner rod 511 moves relative to the sleeve rod 512, driving the gears 424, 425, 426, and 427 to rotate via the rack 6. The gear 427 drives the rack 423 to move, which in turn drives the slide rod 422 to move upward. The slide rod 422 drives the scraper ring 41 to move upward. The scraper ring 41 moves close to the inner wall of the drill barrel 2, passing between the soil and the side wall of the drill barrel 2, thus creating a gap between the soil and the side wall of the drill barrel 2 to reduce the adhesion between the soil and the side wall of the drill barrel 2 and reduce the contact area between the soil and the side wall of the drill barrel 2. At the same time, the push block 429 cooperates with the top push plate 92 to drive the top plate 12 to push the soil downward, so as to quickly discharge the soil in the drill barrel 2 and improve drilling efficiency.

[0074] The present invention also discloses a drilling method for pile foundation construction, which uses the above-mentioned drilling device for pile foundation construction.

[0075] A drilling method for pile foundation construction includes the following steps:

[0076] S1, after moving the drill barrel 2 out of the hole, continue to move the drill barrel 2 upward, causing the inner rod 511 to abut against the baffle 11;

[0077] S2, the movement of the inner rod 511 first drives the movement of the sleeve rod 512, releasing the restriction on the base plate 3 and opening the bottom of the drill barrel 2;

[0078] S3, after the bottom plate 3 is opened, the sleeve rod 512 stops moving, and the inner rod 511 continues to move, driving the sliding rod 422 and the scraper ring 41 to move upward, so that the scraper ring 41 passes between the soil and the side wall of the drill barrel 2 to form a gap between the soil and the side wall of the drill barrel 2.

[0079] S4, after the scraper ring 41 moves above the drill barrel 2, the pusher block 429 cooperates with the top push plate 92 to drive the top pressure plate 91 to rotate and press down the top plate 12, and the top plate 12 pushes out the soil in the drill barrel 2.

[0080] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A drilling device for pile foundation construction, comprising a drilling cylinder assembled on a frame, a baffle located above the drilling cylinder, and a bottom plate rotatably assembled at the bottom of the drilling cylinder, characterized in that, The drilling cylinder is provided with a cleaning assembly and a control assembly for fixing the bottom plate in cooperation with the bottom plate; the control assembly comprises a control rod slidingly assembled in the drilling cylinder; the cleaning assembly comprises a scraping ring and an intermediate piece; the scraping ring is in abutment with the inner wall of the drilling cylinder and is slidingly assembled in the drilling cylinder; and the scraping ring is connected with the control rod through the intermediate piece. When the drilling cylinder moves upward and drives the control rod to abut against the baffle, the baffle drives the control rod to move relative to the drilling cylinder, thereby releasing the restriction on the bottom plate to open the bottom of the drilling cylinder, and the control rod drives the scraping ring to move upward through the intermediate piece to form a gap between the soil and the inner wall of the drilling cylinder. The side surface of the control rod is provided with a vertical rack one; the intermediate piece comprises a gear set and a sliding rod; the sliding rod is slidingly assembled in the drilling cylinder; the lower end of the sliding rod is connected with the scraping ring; the side surface of the sliding rod is provided with a vertical rack two; and the gear set is engaged with the rack one and the rack two at the same time, so that when the control rod moves downward, the sliding rod is driven to move upward. The inner side of the scraping ring is provided with a guide slope; the scraping ring is in rotational cooperation with the sliding rod; the scraping ring is rotationally arranged around the center of the drilling cylinder; a sliding groove is formed in the inner wall of the drilling cylinder; the sliding rod is slidingly assembled in the sliding groove; a guide groove is formed in the side wall of the sliding groove in a vertical direction; the guide groove is in a wave shape; a middle groove is formed in the sliding rod in a penetrating manner; the side surface of the scraping ring is provided with a guide rod; the guide rod is in sliding cooperation with the guide groove through the middle groove; and the guide rod drives the scraping ring to reciprocally rotate when moving in the guide groove. The control rod comprises an inner rod and a sleeve rod; the sleeve rod is slidingly assembled on the drilling cylinder; the inner rod is slidingly assembled in the sleeve rod; the upper end of the inner rod extends to the outside of the sleeve rod; a spring one connected with the drilling cylinder is sleeved on the outside of the sleeve rod; a spring two connected with the sleeve rod is sleeved on the outside of the inner rod; the spring one is used to drive the sleeve rod to move upward; the spring two is used to drive the inner rod to move upward; the elastic force of the spring two is greater than that of the spring one; and the rack one is arranged on the inner rod. A top plate is slidingly assembled in the drilling cylinder; the top plate is arranged close to the top of the drilling cylinder; an elastic telescopic rod connecting the top plate and the drilling cylinder is arranged between the top plate and the drilling cylinder; the elastic telescopic rod is used to drive the top plate to move upward; a pushing assembly is arranged in the drilling cylinder; and a push block is arranged on the sliding rod.

2. The pile construction drilling apparatus according to claim 1, characterized by The inner rod drives the sleeve rod to move downward in cooperation with the baffle; the sleeve rod releases the restriction on the bottom plate when stopping moving; then the inner rod moves relative to the sleeve rod to drive the sliding rod to move through the rack one.

3. The pile construction drilling apparatus according to claim 2, characterized by The side surface of the sleeve rod is provided with a giving slot; the gear set is in cooperation with the rack one through the giving slot; the inner rod drives the sleeve rod to synchronously move downward; and the inner rod drives the rack one to move to cooperate with the gear set after the sleeve rod stops moving.

4. The pile construction drilling apparatus according to claim 1, wherein When the sliding rod drives the scraping ring to move upward to the top plate, the push block drives the top plate to move downward in cooperation with the pushing assembly to push the soil in the drilling cylinder out.

5. The pile construction drilling apparatus according to claim 4, wherein The pushing assembly comprises a top pressing plate rotationally assembled in the drilling cylinder and a top pushing plate slidingly assembled in the drilling cylinder; the top pressing plate is arranged above the top plate; the top pressing plate comprises an extension part; the upper end of the top pushing plate is rotationally connected with the extension part; the lower end of the top pushing plate corresponds to the push block; and the push block drives the top pressing plate to rotate when abutting against the top pushing plate after moving upward.

6. The pile construction drilling apparatus according to claim 1, wherein The gear set comprises gear one, gear two, gear three and gear four, the diameter of gear one and gear three is the same, the diameter of gear one, gear two and gear four increases in turn, gear one and gear two are coaxially connected, gear three and gear four are coaxially connected, gear two and gear three are engaged, gear one and gear rack one are engaged, and gear four and gear rack two are engaged.

7. The pile construction drilling apparatus according to claim 2, wherein The control assembly further comprises a clamping rod, a connecting rod one and a connecting rod two, a clamping sleeve is arranged on one side of the bottom plate close to the inside of the drilling cylinder, the clamping rod is rotatably arranged in the drilling cylinder, the lower end of the clamping rod is buckled with the clamping sleeve to fix the bottom plate, the connecting rod one is rotatably connected with the lower end of the sleeve rod, one end of the connecting rod two is rotatably connected with the connecting rod one, and the other end is fixedly connected with the upper end of the clamping rod, the sleeve rod moves downward to drive the clamping rod to rotate through the connecting rod one and the connecting rod two, so that the lower end of the clamping rod is separated from the clamping sleeve to release the restriction on the bottom plate.

8. A pile construction drilling method using the pile construction drilling apparatus according to claim 5, characterized by, The method comprises the following steps: After the drilling cylinder is removed from the hole, the drilling cylinder is continuously moved upward to drive the inner rod to abut against the baffle; The inner rod is first moved to drive the sleeve rod to move, thereby releasing the restriction on the bottom plate and opening the bottom of the drilling cylinder; After the bottom plate is opened, the sleeve rod stops moving, the inner rod continues to move to drive the sliding rod and the scraping ring to move upward, so that the scraping ring passes between the soil and the side wall of the drilling cylinder to form a gap between the soil and the side wall of the drilling cylinder; After the scraping ring moves above the drilling cylinder, the push block cooperates with the push plate to drive the pressing plate to rotate and press the top plate downward, and the top plate pushes the soil in the drilling cylinder out.

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