Bite perfusion pile long auger drilling device and construction method

Abstract

This invention relates to interlocking cast-in-place pile construction technology, specifically a long spiral drilling device and construction method for interlocking cast-in-place piles. It includes a drill pipe, the upper end of which is concentrically and fixedly connected to the output shaft of a power head. A casing is concentrically and fixedly connected to the output shaft of the power head, with the drill pipe located inside the casing. The drill pipe and casing are concentric, and a spiral auger is fixed to the outer edge of the drill pipe. A hole bottom correction component is installed at the lower end of the drill pipe. In this construction method, the drill pipe and casing are spiraled in together. The casing prevents hole wall collapse during drilling, effectively forming holes in dense, fine sand strata rich in groundwater. It can correct the outer side of the hole bottom, improve the quality of the formed hole, and ensure the quality and stability of the concrete pile. Addressing the limitations of traditional mechanical equipment performance and ultra-thick gravel layers, this construction method solves the problems of hole formation and interlocking of cast-in-place concrete piles under special geological conditions.

Description

Technical Field

[0001] This invention relates to interlocking cast-in-place pile construction technology, specifically to an interlocking cast-in-place pile long spiral drilling device and construction method. Background Technology

[0002] With the acceleration of urbanization, the demand for land resource development and utilization is constantly increasing, and the construction of deep foundation pit projects under such geological conditions faces numerous challenges. Currently, the renovation of old urban residential areas is a nationwide urban renewal project implemented in China, coordinated and promoted by the Ministry of Housing and Urban-Rural Development, possessing enormous market potential. Research on deep foundation pit support construction technology in complex environments such as the extremely large and narrow old riverside urban areas is therefore essential. Deep foundation pit support in old riverside urban areas is a common engineering problem in areas with complex geological conditions, numerous surrounding buildings, high groundwater levels, and narrow construction sites. Therefore, studying the domestic and international technical level, current status, development trends, and feasibility of deep foundation pit support in old riverside urban areas is of great significance.

[0003] As the name suggests, "interlocking piles" refer to reinforced concrete "pile walls" formed by the interlocking of adjacent piles in a planar arrangement. They are mainly used as support structures for deep foundation pits of buildings. Currently, after extensive engineering practice, bored interlocking piles have become a very mature construction technology for support structures in China, and have been widely promoted in deep foundation pit projects for urban structures such as subways, road underpasses, and high-rise buildings.

[0004] Since my country introduced interlocking pile technology in the 1970s, the MZ series of rocker-type full-casing drilling rigs, developed by Kunming Jiecheng Piling Engineering Co., Ltd., emerged in the mid-1990s. These rigs have been widely used in deep foundation pit support projects in Kunming, Wenzhou, Shenzhen, and other cities. However, when the MZ casing drilling rig operates in dense, fine sand strata rich in groundwater, limitations in the mechanical equipment's performance make it difficult for the gripping cone to effectively grip the soil, resulting in hole formation failure. Simultaneously, the casing is difficult to press down, and the advance penetration depth is insufficient, easily leading to piping. Therefore, a new device and construction process are needed to ensure effective hole formation in dense, fine sand strata rich in groundwater. Summary of the Invention

[0005] The purpose of this invention is to provide a long spiral drilling device and construction method for interlocking cast-in-place piles that can effectively form holes in dense silty sand strata rich in groundwater.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A long spiral drilling device for interlocking cast-in-place piles includes a drill pipe, the upper end of which is concentrically and fixedly connected to the output shaft of a power head, and a casing is concentrically and fixedly connected to the output shaft of the power head. The drill pipe is located inside the casing and is concentric with the casing. A spiral auger is fixed to the outer edge of the drill pipe, and a hole bottom correction component is installed at the lower end of the drill pipe.

[0008] As the drill pipe, auger, and bottom hole correction assembly rotate and descend, the casing enters the hole. The casing supports the hole wall, preventing it from collapsing and ensuring the quality of the hole.

[0009] The bottom hole correction assembly includes a fixed plate fixed inside the drill pipe. An inner cylinder is slidably mounted axially inside the drill pipe below the fixed plate. The upper end of the inner cylinder is elastically connected to the fixed plate. A sliding plate is slidably mounted axially inside the inner cylinder. The sliding plate is connected to the fixed plate via a hydraulic rod. A retaining ring is fixed inside the inner cylinder below the sliding plate. The lower end of the sliding plate abuts against the upper end of the retaining ring. Multiple vertical grooves are evenly distributed around the lower circumference of the inner cylinder. A rotating sleeve is rotatably mounted within each vertical groove. A rotating shaft is concentrically rotatably connected within each rotating sleeve. One end of the rotating shaft is fixed on the outer side of the inner cylinder. There is a rotating plate, and a gear is concentrically fixed at one end of the rotating shaft inside the inner cylinder. An end face rack that meshes with the gear is fixed inside the inner cylinder. The end face rack is arc-shaped, and the axis of the end face rack coincides with the rotation axis of the rotating sleeve. The sliding plate is connected to the rotating sleeve through a transmission assembly. A drill bit is concentrically fixed at the lower end of the inner cylinder. Multiple rotating plates are evenly distributed around the outer circumference of the inner cylinder. The upper end of the rotating plate is inclined to the side away from the drilling tube's spiral direction. After the sliding plate moves upward, the rotating plate can rotate to a horizontal state under the action of the end face rack, gear, and transmission assembly.

[0010] The hole bottom correction component can move the rotating plate to a horizontal state after reaching a set depth. After the rotating plate rotates to a horizontal state, it can impact and compact the bottom of the hole and smooth the outer part of the bottom of the hole, which can improve the quality and stability of the concrete pile.

[0011] Specifically, multiple limiting blocks are evenly distributed and fixed around the outer circumference of the inner cylinder, and these limiting blocks are slidably disposed within grooves on the inner wall of the drill pipe. Through the sliding engagement of the limiting blocks and the grooves, the inner cylinder can be ensured to rotate synchronously with the drill pipe during its rotation.

[0012] Specifically, multiple springs are evenly distributed around the upper circumference of the inner cylinder, with the upper ends of the springs fixedly connected to the lower end of the fixed plate. By setting multiple springs that connect the fixed plate and the inner cylinder, the inner cylinder is prevented from moving downwards during the downward movement of the sliding plate, ensuring that the transmission component can drive the rotating sleeve to rotate, thereby changing the angle of the rotating plate.

[0013] Specifically: both ends of the rotating sleeve are fixed with fixed shafts, which are concentric and rotatably connected to the inner cylinder. The rotating sleeve rotates around the axis of the fixed shafts.

[0014] Specifically, the transmission assembly includes a pull rod, one end of which is fixedly connected to a fixed shaft, and the other end of which is rotatably connected to the lower end of a connecting rod. The upper end of the connecting rod is rotatably positioned within the elongated groove of the sliding plate. When the sliding plate moves upward, it drives the rotating sleeve and the fixed shaft to rotate via the connecting rod and the pull rod. One end of the rotating shaft inside the inner cylinder moves upward, and the other end of the rotating shaft outside the inner cylinder moves downward.

[0015] Specifically: Multiple limiting grooves are evenly distributed around the outer circumference of the sliding plate, and a limiting strip corresponding to the limiting groove is fixed to the inner edge of the inner cylinder. The limiting strip is slidably disposed within the limiting groove. During the up-and-down movement of the sliding plate, the stability of the up-and-down movement of the sliding plate is ensured by the cooperation of the limiting strip and the limiting groove.

[0016] Specifically: A baffle corresponding to the rotating plate is fixed to the outer edge of the inner cylinder. The upper end of the rotating plate on the side facing away from the drilling pipe's spiral direction is blocked by the baffle. Multiple alloy heads are fixed to the side of the rotating plate facing the borehole wall. When the rotating plate is tilted, the baffle can block the upper part of the rotating plate. As the rotating plate rotates around the axis of the drill pipe with the inner cylinder, the baffle can improve the rotating plate's impact resistance and prevent deformation of the rotating plate during the borehole enlargement process. During the borehole enlargement process, the alloy heads have extremely high hardness and wear resistance, effectively cutting and crushing high-hardness and highly abrasive rock layers (such as granite and quartzite), ensuring drilling rate and quality.

[0017] Specifically: The inner cylinder has multiple outlet holes evenly distributed around its side wall. The outlet holes are located inside the lower part of the drill pipe. A sliding tube communicating with the outlet holes is fixed inside the inner cylinder. The sliding tube includes a straight part at the bottom and a vertical part at the top. The straight part is fixed inside the inner cylinder and communicates with the outlet holes. A fixed tube corresponding to the sliding tube is fixed on the fixed plate. The fixed tube is vertically arranged, and the vertical part of the sliding tube is slidably and sealingly inserted into the fixed tube.

[0018] When the hydraulic rod extends, the sliding plate is blocked by the retaining ring, and the inner cylinder drives the drill bit, transmission assembly and rotating plate downward. The vertical part of the sliding tube slides downward outside the fixed tube. When the outlet moves to the bottom of the drill pipe and connects with the opening hole, concrete can be injected into the opening hole through the drill pipe, fixed tube and sliding tube.

[0019] The construction method of the long spiral drilling device for interlocking cast-in-place piles is as follows: The upper ends of the drill pipe and casing are concentrically fixed to the output shaft of the power head, with the drill pipe located inside the casing. The power head is started, driving the casing, drill pipe, spiral auger, and bottom hole correction assembly to rotate around the axis of the drill pipe. Using a lifting device, the power head descends. During the downward rotation of the casing, drill pipe, spiral auger, and bottom hole correction assembly, the bottom hole correction assembly excavates a hole in the working stratum. As the drill pipe, spiral auger, and bottom hole correction assembly spiral downwards, the casing enters the hole. The soil generated during the excavation process by the bottom hole correction assembly... Under the rotation of the auger, the material is discharged upward from the annular cavity between the drill pipe and the casing. After the bottom hole correction component reaches the set depth, the hydraulic rod is activated, which drives the sliding plate to move upward in the inner cylinder. During the upward movement of the sliding plate, under the action of the transmission component, the rotating sleeve rotates around the axis of the fixed shaft. At the same time, under the meshing action of the end face rack and gear, the gear, the rotating shaft and the rotating plate rotate around the axis of the rotating sleeve. When the sliding plate stops moving upward, the rotating plate is in a horizontal state. During the subsequent downward rotation of the casing, drill pipe, auger and bottom hole correction component, the horizontal rotating plate can correct the bottom of the hole.

[0020] This construction method involves simultaneously advancing the drill pipe and casing. The casing prevents borehole wall collapse during drilling, effectively forming holes in dense, fine sand strata rich in groundwater. It also allows for correction of the outer side of the borehole bottom, improving borehole quality and ensuring the quality and stability of the concrete piles. Addressing the limitations of traditional machinery and the constraints of ultra-thick gravel layers, this method solves the problems of borehole formation and interlocking of cast-in-place concrete piles under special geological conditions. Attached Figure Description

[0021] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments of this application and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0022] Figure 1 This is a schematic diagram of the drill pipe;

[0023] Figure 2 for Figure 1 Enlarged view of region A in the middle;

[0024] Figure 3 This is a cross-sectional view of the lower part of the drill pipe and the inner cylinder;

[0025] Figure 4 for Figure 3 Enlarged view of region B in the middle;

[0026] Figure 5 for Figure 3 Enlarged view of region C in the middle;

[0027] Figure 6 A schematic diagram of creating a groove on the inner edge of the lower part of the drill pipe;

[0028] Figure 7 This is a schematic diagram of the inner cylinder;

[0029] Figure 8 A schematic diagram showing the connection between the sliding plate and the rotating sleeve in the transmission assembly;

[0030] Figure 9 This is a schematic diagram showing the rotating plate after it has been rotated to a horizontal position.

[0031] Figure 10 This is a schematic diagram of the inner cylinder descending inside the drill pipe.

[0032] In the diagram, 1. Drill pipe; 2. Spiral auger; 3. Fixed plate; 4. Slide groove; 5. Inner cylinder; 6. Limiting block; 7. Spring; 8. Outlet hole; 9. Fixed tube; 10. Sliding tube; 11. Fixed shaft; 12. Rotating sleeve; 13. Rotating shaft; 14. Gear; 15. Rotating plate; 16. Alloy head; 17. End face rack; 18. Tie rod; 19. Connecting rod; 20. Sliding plate; 21. Limiting groove; 22. Hydraulic rod; 23. Baffle; 24. Retaining ring; 25. Drill bit; 26. Vertical groove; 27. Limiting strip; 28. Long groove. Detailed Implementation

[0033] The following will describe in detail the implementation of this application with reference to the accompanying drawings and embodiments, so that the implementation process of how this application uses technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0034] like Figure 1 As shown, the long spiral drilling device for interlocking cast-in-place piles includes a drill pipe 1, with a spiral auger 2 fixed to the outer edge of the drill pipe 1. The spiral auger 2 rotates along with the drill pipe 1 during its rotation.

[0035] The upper end of drill pipe 1 is concentrically and fixedly connected to the output shaft of the power head. The output shaft of the power head is concentrically and fixedly connected to a casing. Drill pipe 1 is located inside the casing, and drill pipe 1 and casing are concentric. After the power head is started, drill pipe 1, auger 2 and casing rotate together.

[0036] A hole bottom correction assembly is installed at the lower end of drill pipe 1.

[0037] like Figure 3 and Figure 6As shown, the bottom hole correction assembly further includes a fixing plate 3 fixed inside the drill pipe 1, and an inner cylinder 5 slidably disposed in the axial direction inside the drill pipe 1 below the fixing plate 3. Specifically, multiple limiting blocks 6 are evenly distributed and fixed around the outer circumference of the inner cylinder 5, and the limiting blocks 6 are slidably disposed in the grooves 4 on the inner wall of the drill pipe 1. The inner cylinder 5 can move in the axial direction within the lower part of the drill pipe 1. During the rotation of the drill pipe 1, under the cooperation of the limiting blocks 6 and the grooves 4, the inner cylinder 5 rotates synchronously with the drill pipe 1.

[0038] like Figure 3 and Figure 7 As shown, the upper end of the inner cylinder 5 is elastically connected to the fixed plate 3. Specifically, multiple springs 7 are evenly distributed around the upper circumference of the inner cylinder 5, and the upper ends of the springs 7 are fixedly connected to the lower ends of the fixed plate 3. Under the tension of the springs 7, the inner cylinder 5 will not detach from the lower part of the drill pipe 1.

[0039] like Figure 3 As shown, a sliding plate 20 is slidably disposed on the inner side of the inner cylinder 5 in the axial direction. The sliding plate 20 is connected to the fixed plate 3 via a hydraulic rod 22. The upper end of the hydraulic rod 22 is fixedly connected to the lower end of the fixed plate 3, and the lower end of the hydraulic rod 22 is fixedly connected to the upper end of the sliding plate 20.

[0040] Furthermore, the sliding plate 20 has multiple limiting grooves 21 evenly distributed around its outer circumference, and the inner cylinder 5 has a limiting strip 27 corresponding to the limiting groove 21 fixed on its inner edge. The limiting strip 27 is slidably disposed within the limiting groove 21. The cooperation between the limiting strip 27 and the limiting groove 21 can improve the stability of the sliding plate 20 during its up-and-down movement.

[0041] like Figure 3 and Figure 4 As shown, a retaining ring 24 is fixed in the inner cylinder 5 below the sliding plate 20, and the lower end of the sliding plate 20 is tightly pressed against the upper end of the retaining ring 24. During the downward movement of the sliding plate 20, the inner cylinder 5 can be moved downward through the retaining ring 24, and the spring 7 is stretched after the inner cylinder 5 moves downward.

[0042] like Figure 2 As shown, multiple vertical grooves 26 are evenly distributed around the lower circumference of the inner cylinder 5, and rotating sleeves 12 are rotatably installed in each of the vertical grooves 26. Specifically, both ends of the rotating sleeve 12 are fixed with a fixed shaft 11, and the fixed shafts 11 at both ends of the rotating sleeve 12 are concentric and rotatably connected to the inner cylinder 5. The rotating sleeve 12 can rotate around the axis of the fixed shaft 11.

[0043] like Figure 8 As shown, a rotating shaft 13 is concentrically connected inside the rotating sleeve 12. A rotating plate 15 is fixed to one end of the rotating shaft 13 on the outer side of the inner cylinder 5, and a gear 14 is concentrically fixed to one end of the rotating shaft 13 on the inner side of the inner cylinder 5. During the rotation of the rotating shaft 13 inside the rotating sleeve 12, the gear 14 and the rotating plate 15 rotate synchronously.

[0044] like Figure 3 and Figure 4 As shown, an end-face rack 17 that meshes with the gear 14 is fixed inside the inner cylinder 5. The end-face rack 17 is arc-shaped, and its axis coincides with the rotation axis of the rotating sleeve 12, that is, the axis of the end-face rack 17 coincides with the axis of the fixed shaft 11. When one end of the rotating shaft 13 inside the inner cylinder 5 rotates upward, under the meshing action of the end-face rack 17 and the gear 14, the gear 14, the rotating shaft 13, and the rotating plate 15 rotate around the axis of the rotating sleeve 12.

[0045] like Figure 3 , Figure 4 and Figure 8 As shown, the sliding plate 20 and the rotating sleeve 12 are connected by a transmission assembly. The transmission assembly includes a pull rod 18, one end of which is fixedly connected to a fixed shaft 11, and the other end of which is rotatably connected to the lower end of a connecting rod 19. The upper end of the connecting rod 19 is rotatably disposed within the elongated groove 28 of the sliding plate 20. When the sliding plate 20 moves upward within the inner cylinder 5, it pulls the connecting rod 19 upward, which in turn pulls one end of the pull rod 18 connected to it to swing upward. The pull rod 18, through the fixed shaft 11, causes the rotating sleeve 12 to rotate around the axis of the fixed shaft 11.

[0046] like Figures 1-3 As shown, a drill bit 25 is concentrically fixed at the lower end of the inner cylinder 5. During the downward rotation of the drill pipe 1, the drill bit 25 pre-dug the soil.

[0047] like Figure 2 and Figure 7 As shown, multiple rotating plates 15 are evenly distributed around the outer circumference of the inner cylinder 5, and the upper end of the rotating plate 15 is inclined to the side away from the direction of the drill pipe 1.

[0048] like Figure 9 As shown, after the sliding plate 20 moves upward, the rotating plate 15 can rotate to a horizontal state under the action of the end face rack 17, gear 14 and transmission assembly.

[0049] like Figure 7 As shown, a baffle 23 corresponding to the rotating plate 15 is fixed on the outer edge of the inner cylinder 5. The upper end of the rotating plate 15 facing away from the drilling pipe 1 is blocked by the baffle 23. Multiple alloy heads 16 are fixed on the side of the rotating plate 15 facing the hole wall where the hole is opened.

[0050] When the rotating plate 15 is tilted, the baffle 23 can block the upper part of the rotating plate 15. During the rotation of the rotating plate 15 around the axis of the drill pipe 1 along with the inner cylinder 5, the baffle 23 can improve the impact resistance of the rotating plate 15 and prevent deformation of the rotating plate 15 during the process of enlarging the diameter of the hole. During the process of enlarging the diameter of the hole, the alloy head 16 has extremely high hardness and wear resistance, which can effectively cut and crush high-hardness and high-abrasive rock layers (such as granite, quartzite, etc.), ensuring drilling rate and quality.

[0051] In actual operation, the upper end of drill pipe 1 and the upper end of casing are concentrically and fixedly connected to the output shaft of the power head, with drill pipe 1 located inside casing.

[0052] Start the power head, which drives the casing, drill pipe 1, auger 2, and bottom hole correction assembly to rotate around the axis of drill pipe 1. Use a lifting device to lower the power head.

[0053] During the downward rotation of the casing, drill pipe 1, auger 2 and bottom hole correction assembly, the drill bit 25 pre-dug the soil to form an initial hole. Subsequently, the rotating plate 15, which rotates around the axis of the drill pipe 1, enlarges the initial hole. The soil generated by the drill bit 25 digging the soil and the rotating plate 15 enlarging the hole is transported upward by the auger 2 and discharged from the top of the drill pipe 1.

[0054] After the hole is formed, the rotating sleeve enters the hole, and the sleeve can prevent the hole wall from collapsing.

[0055] After the hole bottom correction component reaches the set depth, the hydraulic rod 22 is activated. The hydraulic rod 22 drives the sliding plate 20 to move upward in the inner cylinder 5. During the upward movement of the sliding plate 20, the sliding plate 20 pulls the connecting rod 19 upward. The connecting rod 19 pulls one end of the pull rod 18 connected to it to swing upward. The pull rod 18 causes the rotating sleeve 12 to rotate around the axis of the fixed shaft 11 through the fixed shaft 11. One end of the rotating shaft 13 in the inner cylinder 5 rotates upward, and the other end of the rotating shaft 13 on the outside of the inner cylinder 5 rotates downward. At the same time, under the meshing action of the end face rack 17 and the gear 14, the gear 14, the rotating shaft 13, and the rotating plate 15 rotate around the axis of the rotating sleeve 12.

[0056] When the sliding plate 20 stops moving upward, the rotating plate 15 rotates around the axis of the rotating sleeve 12 to a horizontal state. During the subsequent downward rotation of the casing, drill pipe 1, auger 2 and hole bottom correction assembly, the horizontally positioned rotating plate 15 can correct the bottom of the hole.

[0057] During the downward rotation of the casing, drill pipe 1, auger 2, and bottom hole correction assembly, as the sliding plate 20 moves upward and a gap is created between it and the retaining ring 24, when the rotating plate 15 rotates around the axis of the drill pipe 1 and comes into contact with the bottom of the hole, the inner cylinder 5 can squeeze the spring 7 upward, thereby buffering and protecting the rotating plate 15 and preventing it from directly contacting the bottom of the hole and causing deformation and damage to the rotating plate 15.

[0058] During the rotation of the horizontally rotating plate 15 around the axis of the drill pipe 1, the horizontally rotating plate 15 can smooth and compact the outer part of the bottom of the hole, while the drill bit 25 causes a conical hole to be formed at the center of the bottom of the hole. After concrete is injected into the hole, the lower outer edge of the concrete pile is flush with the bottom of the hole, and the lower center of the concrete pile protrudes into the conical hole formed at the center of the bottom of the hole, thus improving the stability and quality of the concrete pile.

[0059] like Figure 3 and Figure 5 As shown, multiple outlet holes 8 are evenly distributed around the side wall of the inner cylinder 5. The outlet holes 8 are located inside the lower part of the drill pipe 1. A sliding tube 10 communicating with the outlet holes 8 is fixed inside the inner cylinder 5. The sliding tube 10 includes a lower straight part and an upper vertical part. The straight part is fixed inside the inner cylinder 5 and communicates with the outlet holes 8. A fixing tube 9 corresponding to the sliding tube 10 is fixed on the fixing plate 3. The fixing tube 9 is vertically arranged, and the vertical part of the sliding tube 10 is slidably and sealedly inserted into the fixing tube 9.

[0060] like Figure 10 As shown, when the hydraulic rod 22 extends, the sliding plate 20 descends. During the descent of the sliding plate 20, the rotating plate 15 rotates and resets. When the sliding plate 20 is blocked by the retaining ring 24, the rotating plate 15 completes its rotation and reset. Subsequently, during the descent of the sliding plate 20, the retaining ring 24 drives the inner cylinder 5, drill bit 25, transmission assembly, and rotating plate 15 downwards. The vertical part of the sliding tube 10 slides downwards outside the fixed tube 9. When the outlet hole 8 moves below the drill pipe 1 and connects with the opening hole, concrete can be injected into the opening hole through the drill pipe 1, fixed tube 9, sliding tube 10, and outlet hole 8. During the injection of concrete into the opening hole, the drill pipe 1 and casing rotate upwards. The upward rotation of the casing prevents the hole wall from collapsing.

[0061] This device uses a hydraulic rod 22 to drive a sliding plate 20, connecting rod 19, tie rod 18, and a gear and rack transmission system to automatically switch the rotating plate 15 between the hole enlargement stage and the hole bottom finishing stage. The horizontally positioned rotating plate 15 can simultaneously smooth and compact the outer side of the hole bottom, while the drill bit 25 forms a central conical hole, significantly improving the structural optimization of the lower end bearing capacity and concrete density of the concrete pile.

[0062] The spring 7 connecting the inner cylinder 5 and the fixed plate 3 forms a key buffer structure. When the rotating plate 15 contacts the hard rock or obstacle at the bottom of the hole, the inner cylinder 5 can compress the spring 7 and move upward to absorb the impact energy, effectively preventing deformation or cracking of the rotating plate 15 and other components due to hard contact, and greatly improving the durability of the equipment in complex strata.

[0063] The rotating casing tracks the drilling process in real time, providing immediate support to the borehole wall to prevent collapse; the bottom correction component is integrated inside the drill pipe 1, enabling precise correction of the bottom shape without lifting the drill after the borehole is completed; the specially designed sliding pipe 10 and fixed pipe 9 can be directly switched to grouting channels after hole repair, realizing continuous and seamless operation of hole formation, correction, and grouting, greatly improving construction efficiency.

[0064] The structure formed by the modification of the bottom of the borehole, resulting in a smooth outer surface and a conical hole in the center, creates a composite structure at the bottom of the concrete pile after grouting, consisting of an outer bearing surface and a central embedded tenon. This structure significantly enhances the mechanical interlocking force and end bearing capacity between the concrete pile tip and the foundation soil, fundamentally improving the overall stability of the pile foundation.

[0065] The specification and claims use certain terms to refer to specific components. Those skilled in the art will understand that hardware manufacturers may use different names to refer to the same component. This specification and claims do not distinguish components based on differences in name, but rather on differences in function. The term "comprising" throughout the specification and claims is an open-ended term and should be interpreted as "comprising but not limited to." "Approximately" means that within an acceptable margin of error, those skilled in the art can solve the technical problem and substantially achieve the technical effect within a certain margin of error.

[0066] It should be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a product or system comprising a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a product or system. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the product or system that includes said element.

[0067] The foregoing description illustrates and describes several preferred embodiments of the present invention. However, as previously stated, it should be understood that the present invention is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the inventive concept described herein through the foregoing teachings or techniques or knowledge in related fields. Any modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention should be within the protection scope of the appended claims.

Claims

1. A long spiral drilling device for interlocking cast-in-place piles, comprising a drill pipe (1), the upper end of which is concentrically and fixedly connected to the output shaft of a power head, a sleeve being concentrically and fixedly connected to the output shaft of the power head, the drill pipe (1) being located inside the sleeve, the drill pipe (1) being concentric with the sleeve, and a spiral auger (2) being fixed to the outer edge of the drill pipe (1), characterized in that: A hole bottom correction assembly is installed at the lower end of the drill pipe (1); the hole bottom correction assembly includes a fixed plate (3) fixed inside the drill pipe (1), an inner cylinder (5) is slidably arranged in the axial direction inside the drill pipe (1) below the fixed plate (3), the upper end of the inner cylinder (5) is elastically connected to the fixed plate (3), a sliding plate (20) is slidably arranged in the axial direction inside the inner cylinder (5), the sliding plate (20) is connected to the fixed plate (3) by a hydraulic rod (22), a retaining ring (24) is fixed in the inner cylinder (5) below the sliding plate (20), the lower end of the sliding plate (20) is tightly against the upper end of the retaining ring (24), a number of vertical grooves (26) are evenly distributed around the lower end of the inner cylinder (5), a rotating sleeve (12) is rotatably arranged in each of the vertical grooves (26), a rotating shaft (13) is concentrically rotatably connected in the rotating sleeve (12), and the outer side of the inner cylinder (5) A rotating plate (15) is fixed at one end of the rotating shaft (13) on the side. A gear (14) is concentrically fixed at one end of the rotating shaft (13) on the inner side of the inner cylinder (5). An end face rack (17) that meshes with the gear (14) is fixed on the inner side of the inner cylinder (5). The end face rack (17) is arc-shaped. The axis of the end face rack (17) coincides with the axis of rotation of the rotating sleeve (12). The sliding plate (20) is connected to the rotating sleeve (12) through a transmission assembly. A drill bit (25) is concentrically fixed at the lower end of the inner cylinder (5). Multiple rotating plates (15) are evenly distributed around the outer circumference of the inner cylinder (5). The upper end of the rotating plate (15) is inclined to the side away from the direction of the drill pipe (1). After the sliding plate (20) moves upward, the rotating plate (15) can rotate to a horizontal state under the action of the end face rack (17), the gear (14) and the transmission assembly.

2. The long spiral drilling device for interlocking cast-in-place piles as described in claim 1, characterized in that: Multiple limiting blocks (6) are evenly distributed and fixed around the outer edge of the inner cylinder (5), and the limiting blocks (6) are slidably disposed in the groove (4) on the inner wall of the drill pipe (1).

3. The long spiral drilling device for interlocking cast-in-place piles as described in claim 1, characterized in that: Multiple springs (7) are evenly distributed around the upper circumference of the inner cylinder (5), and the upper end of the springs (7) is fixedly connected to the lower end of the fixing plate (3).

4. The long spiral drilling device for interlocking cast-in-place piles as described in claim 1, characterized in that: Both ends of the rotating sleeve (12) are fixed with fixed shafts (11), the fixed shafts (11) at both ends of the rotating sleeve (12) are concentric, and the fixed shafts (11) are rotatably connected to the inner cylinder (5).

5. The long spiral drilling device for interlocking cast-in-place piles as described in claim 4, characterized in that: The transmission assembly includes a pull rod (18), one end of which is fixedly connected to a fixed shaft (11), and the other end of which is rotatably connected to the lower end of a connecting rod (19). The upper end of the connecting rod (19) is rotatably disposed in the long groove (28) of the sliding plate (20).

6. The long spiral drilling device for interlocking cast-in-place piles as described in claim 1, characterized in that: The sliding plate (20) has multiple limiting grooves (21) evenly distributed around its outer circumference. The inner cylinder (5) has a limiting strip (27) corresponding to the limiting groove (21) fixed on its inner edge. The limiting strip (27) is slidably disposed in the limiting groove (21).

7. The long spiral drilling device for interlocking cast-in-place piles as described in claim 1, characterized in that: The outer edge of the inner cylinder (5) is fixed with a baffle (23) corresponding to the rotating plate (15). The upper end of the rotating plate (15) facing away from the drilling pipe (1) is blocked by the baffle (23). Multiple alloy heads (16) are fixed on the side of the rotating plate (15) facing the hole wall of the hole.

8. The long spiral drilling device for interlocking cast-in-place piles as described in claim 1, characterized in that: The inner cylinder (5) has multiple outlet holes (8) evenly distributed around its side wall. The outlet holes (8) are located inside the lower part of the drill pipe (1). A sliding tube (10) communicating with the outlet holes (8) is fixed inside the inner cylinder (5). The sliding tube (10) includes a flat part at the bottom and a vertical part at the top. The flat part is fixed inside the inner cylinder (5) and communicates with the outlet holes (8). A fixed tube (9) corresponding to the sliding tube (10) is fixed on the fixed plate (3). The fixed tube (9) is vertically arranged, and the vertical part of the sliding tube (10) is slidably and sealedly inserted into the fixed tube (9).

9. A construction method based on the interlocking cast-in-place pile long spiral drilling device according to claim 1, characterized in that: The upper end of the drill pipe (1) and the upper end of the casing are concentrically fixed to the output shaft of the power head, and the drill pipe (1) is located inside the casing. The power head is started, and the power head drives the casing, drill pipe (1), auger (2) and bottom hole correction assembly to rotate around the axis of the drill pipe (1). The power head is lowered by using the lifting device. During the downward rotation of the casing, drill pipe (1), auger (2) and bottom hole correction assembly, the bottom hole correction assembly drills out the opening hole in the construction stratum. During the downward rotation of the drill pipe (1), auger (2) and bottom hole correction assembly, the casing enters the opening hole. The soil generated during the drilling process of the bottom hole correction assembly is discharged upward from the annular cavity between the drill pipe (1) and the casing under the rotation action of the auger (2). After the hole bottom correction assembly reaches the set depth, the hydraulic rod (22) is activated. The hydraulic rod (22) drives the sliding plate (20) to move upward in the inner cylinder (5). During the upward movement of the sliding plate (20), under the action of the transmission assembly, the rotating sleeve (12) rotates around the axis of the fixed shaft (11). At the same time, under the meshing action of the end face rack (17) and the gear (14), the gear (14), the rotating shaft (13) and the rotating plate (15) rotate around the axis of the rotating sleeve (12). When the sliding plate (20) stops moving upward, the rotating plate (15) is in a horizontal state. During the subsequent downward rotation of the casing, drill pipe (1), auger (2) and hole bottom correction assembly, the horizontal rotating plate (15) can correct the bottom of the hole.

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