Pile foundation obstacle removing device and pile foundation reinforcing construction method

Abstract

The pile foundation obstacle removing device comprises a drilling machine body, a transmission shaft of the drilling machine body is fixedly connected with a locking head, and a splicing frame is arranged at the end of the locking head; the steel sleeve is arranged at the bottom of the splicing frame, a connecting flange is arranged at a lower end opening of the steel sleeve, and a plurality of drill bits are arranged on the connecting flange in a circumferential arrangement mode for waste pile obstacle removal; the clamping mechanisms are arranged on the periphery of the inner wall of the steel sleeve. The waste pile removing efficiency and safety can be effectively improved, and the operation precision and stability of the whole device are further guaranteed.

Description

Technical Field

[0001] The present application relates to the technical field of pile foundation construction, and in particular to a pile foundation obstacle clearing device and a pile foundation reinforcement construction method. Background Art

[0002] At present, pile foundation construction is an indispensable part of modern construction projects, especially in urban infrastructure construction. With the acceleration of urbanization, the quality and efficiency of pile foundation construction have become one of the key factors. However, in the actual construction process, due to the complex and changeable geological conditions and improper early construction, waste piles often need to be cleaned up.

[0003] The main method for clearing waste piles is to use a hydraulic breaker installed on an excavator to break the waste piles before removing them; although it can effectively destroy the structure of the waste piles, it is difficult to completely remove the deeper waste piles. Or a full-rotation drill can be used for removal, but in the process of removing the waste piles, if the pile body is damaged or has weak points, it may not be able to withstand the pulling force during the removal process and the pile may break; in addition, the traditional pile foundation reinforcement method uses ordinary cement mortar or concrete backfill, which often forms gaps between the hole wall and the backfill material due to problems such as uneven mixing and poor fluidity, affecting the reinforcement effect.

[0004] In view of the above-mentioned related technologies, it is necessary to propose a pile foundation obstacle clearing device and a pile foundation reinforcement construction method to solve one of the above-mentioned technical problems. Summary of the invention

[0005] In order to solve one of the above-mentioned technical problems, the present application provides a pile foundation obstacle clearing device and a pile foundation reinforcement construction method.

[0006] The present application provides a pile foundation obstacle removal device and a pile foundation reinforcement construction method using the following technical solutions: A pile foundation obstacle clearing device, comprising: A drilling rig body, a transmission shaft of the drilling rig body is fixedly connected with a locking head, and an end of the locking head is provided with a splicing frame; A steel casing is arranged at the bottom of the splicing frame, a connecting flange is arranged at the lower end of the steel casing, and a plurality of drill bits are arranged in a circle on the connecting flange to clear the waste piles; The clamping mechanism is arranged around the inner wall of the steel casing, and the clamping mechanism includes an arc frame, a push rod, a clamping plate and a plurality of threaded plug rods. The arc frames are respectively penetrated and arranged around the inner wall of the steel pipe sleeve, and the push rod is telescopically arranged in the arc frame. The rod head of the push rod is fixedly connected with a connecting block, and the connecting block is connected to the rear end of the clamping plate. The inner side of the clamping plate is penetrated with a plurality of mounting grooves, and a driving motor is arranged in the mounting groove. The threaded plug rod is arranged in the mounting groove, and the tail end of the threaded plug rod is connected to the output end of the driving motor, so that the threaded plug rod is inserted to the outside of the waste pile.

[0007] By adopting the above technical solution, the pile foundation obstacle removal device can effectively improve the efficiency and safety of waste pile removal; specifically, the drilling rig body drives the steel casing and the drill bit thereon to rotate through the transmission shaft, thereby achieving efficient removal of waste piles; at the same time, the design of the clamping mechanism enables the waste piles to be firmly grasped during the obstacle removal process to prevent them from loosening or falling off, thereby ensuring safe and reliable operation; in addition, the entire device has a compact structure and is easy to operate, which facilitates rapid installation and disassembly on site, thereby improving construction efficiency.

[0008] Optionally, a support seat is provided in the arc-shaped frame, a driving cylinder is provided at one end of the support seat, and an output end of the driving cylinder is connected to the tail end of the push rod, so that the push rod drives the clamping plate to clamp the waste pile.

[0009] By adopting the above technical solution, the pile foundation clearing device can accurately control the clamping force of the clamping plate on the waste pile, ensure stability during the lifting process, and avoid slipping or damage of the waste pile due to improper clamping; at the same time, the setting of the driving cylinder makes the entire clamping operation more flexible and reliable, thereby improving work efficiency and safety.

[0010] Optionally, a splicing plate is provided at the bottom of the outer end of the splicing frame, and a connecting plate is provided outside the top port of the steel casing. Both the splicing plate and the connecting plate are provided with positioning holes, and a positioning rod is provided in the positioning hole. Both ends of the positioning rod are fastened to the splicing plate and the connecting plate by nuts.

[0011] By adopting the above technical solution, the connection between the splicing frame and the steel casing is more stable and reliable, effectively preventing loosening or falling off due to vibration during the clearance process; at the same time, the design of the positioning holes and positioning rods can quickly and accurately achieve the docking of the splicing frame and the steel casing, improving installation efficiency; in addition, the nut fastening method facilitates rapid disassembly and maintenance on site, improving the flexibility and adaptability of the equipment.

[0012] Optionally, limiting grooves are provided all around the top of the splicing plate, and a limiting rod is provided outside the positioning rod and extends relative to the limiting groove, and the limiting rod is clamped in the limiting groove.

[0013] By adopting the above technical scheme, the splicing plate and the connecting plate of the pile foundation clearing device can not only be fastened by the positioning rod and the nut, but also the design of the limiting groove and the limiting rod is added, so that the positioning rod is more stable during installation, avoiding the loosening problem caused by vibration or impact, and improving the overall stability of the device; at the same time, the limiting rod is clamped in the limiting groove, which further enhances the connection strength between the splicing plate and the connecting plate, ensures the reliable docking of the steel casing and the drilling rig body, and improves the safety and reliability in the waste pile clearing process.

[0014] Optionally, a lifting rope is provided on the top of the drilling rig body for connecting to a crane at the construction site.

[0015] By adopting the above technical solution, the lifting rope can be easily connected to the crane at the construction site, which is convenient for the overall lifting and movement of the drilling rig body, thereby improving the construction efficiency and safety.

[0016] A pile foundation reinforcement construction method comprises the following construction steps: Determine the clearing position of the pile foundation, prepare the clearing device and related auxiliary equipment, drive the steel casing at the splicing frame to rotate at the corresponding clearing position of the waste pile through the transmission shaft of the drilling rig body, and clear the waste pile through the drill bit at the steel casing. Lift the drilling rig body with a crane, lift the steel casing, and the waste pile will be used in conjunction with the clamping mechanism in the steel casing to stably follow the steel casing and be lifted out of the drill hole; Backfill the hole depth with fluidized solidified soil, and complete the backfill before the fluidized solidified soil begins to solidify; ensure that after the fluidized soil solidifies, it forms a good dense soil layer with the soil layer around the hole wall to meet the bearing capacity of the on-site construction machinery; In the affected area around the borehole, cement soil is mixed and reinforced by mixing piles to ensure that the cement soil is fully and evenly mixed in pairs, presenting a four-leaf clover reinforcement form. After forming, new piles are drilled. After the drilling is completed, the bundled steel cage is placed in the new pile hole, and concrete is poured to finally form a new pile.

[0017] By adopting the above technical scheme, the pile foundation reinforcement construction method can effectively solve the impact of waste piles on the construction of new piles; firstly, through the coordinated use of the drilling rig body and the steel casing, the waste piles can be efficiently removed to ensure the safety and reliability of the obstacle removal process; secondly, the waste piles are stably lifted by the clamping mechanism, which avoids the risk of the waste piles falling off during the lifting process and improves the working efficiency; in addition, when backfilling the hole depth, fluidized solidified soil is used and its uniformity is ensured, so that the backfilled soil has a higher density and bearing capacity, meeting the requirements of subsequent construction; finally, cement soil mixing reinforcement is carried out through mixing piles, which not only enhances the stability of the surrounding soil, but also forms a good four-leaf clover reinforcement structure, further improving the overall performance of the entire construction area.

[0018] Optionally, the depth of the hole bottom after clearing the obstacles is 10m~15m greater than the length of the waste pile.

[0019] By adopting the above technical solution, it is possible to ensure that the abandoned piles and their residual parts are completely removed, avoiding the impact on the construction quality of subsequent new piles due to incomplete removal of the abandoned piles; at the same time, the increased depth can effectively prevent potential geological problems, improve the foundation stability of the new piles, and enhance the safety and reliability of the overall structure.

[0020] Optionally, the obstacle clearing and drilling depth is greater than the theoretical depth of 500 mm in physical detection, and the depth is reviewed during the drilling process.

[0021] By adopting the above technical solution, the problem of incomplete obstacle clearance due to changes in geological conditions or detection errors can be avoided. At the same time, real-time review of the depth during the drilling process can promptly discover and correct possible deviations, further improve construction accuracy and quality, and ensure the safety and reliability of subsequent pile foundation reinforcement.

[0022] Optionally, the reinforcement depth of the mixing piles is 2m deeper than the hole depth after obstacle clearing.

[0023] By adopting the above technical solution, the stability of the new piles can be further improved, ensuring that the new piles have better compressive resistance and bearing capacity when subjected to stress. The increased reinforcement depth of 2m helps prevent soil loosening or collapse, thereby reducing uneven settlement of the soil around the new piles and improving the safety of the entire structure. This design can also better form a close bond with the original soil layer, increase the friction between the new piles and the surrounding soil, and improve the stability of the overall structure.

[0024] Optionally, during the backfilling process of the fluidized solidified soil, the fluidized solidified soil is uniformly stirred by a stirring device until there is no mud lumps, thereby ensuring the uniformity and fluidity of the fluidized solidified soil.

[0025] By adopting the above technical solution, the problem of poor backfill quality caused by mud blocks can be avoided, thereby ensuring the density and stability of the fluidized solidified soil during the backfilling process at the hole depth, and further enhancing the bearing capacity of the soil layer around the hole wall.

[0026] In summary, the present application includes at least one of the following beneficial technical effects: 1. The clamping mechanism ensures that the waste piles are firmly clamped to prevent them from falling off during the lifting process, greatly enhancing the safety of the obstacle removal process; at the same time, the stable connection between the steel casing and the splicing frame further guarantees the operating accuracy and stability of the entire device; 2. Use fluidized solidified soil to backfill the hole depth, ensuring that the fluidized soil forms a good dense soil layer with the soil layer around the hole wall after solidification, so as to meet the bearing capacity of the on-site construction machinery and avoid the gap problem existing in the traditional backfilling method; 3. Within the affected area around the borehole, cement soil is mixed and reinforced through mixing piles to ensure that the cement soil is fully and evenly mixed in pairs, presenting a four-leaf clover reinforcement form, thereby enhancing the overall stability of the foundation. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a three-dimensional view of a pile foundation obstacle removal device in this application.

[0028] Figure 2 It is a front view of a pile foundation obstacle clearing device in the present application.

[0029] Figure 3 yes Figure 1 A schematic diagram of the enlarged structure at point A in the middle.

[0030] Figure 4 It is a cross-sectional view of a steel casing of a pile foundation obstacle removal device in the present application.

[0031] Figure 5 yes Figure 4 A magnified schematic diagram of the structure at point B in the middle.

[0032] Figure 6 It is a side sectional view of a clamping plate of a pile foundation obstacle clearing device in the present application.

[0033] Figure 7 It is a plan view of the pile foundation reinforcement construction method after the pile foundation construction is completed.

[0034] In the figure: 1. Drilling machine body; 11. Locking head; 12. Splicing frame; 121. Splicing plate; 122. Limiting groove; 13. Lifting rope; 2. Steel casing; 21. Connecting flange; 22. Drill bit; 23. Connecting plate; 24. Positioning rod; 25. Limiting rod; 3. Clamping mechanism; 31. Arc frame; 32. Push rod; 33. Clamping plate; 331. Placement groove; 332. Drive motor; 34. Threaded rod; 35. Connecting block; 36. Support seat; 37. Drive cylinder; 4. Soil reinforcement; 5. New pile. DETAILED DESCRIPTION

[0035] The following is combined with the accompanying drawings Figure 1-Figure 7 This application is described in further detail.

[0036] Example 1, reference Figure 1-Figure 6 The embodiment of the present application discloses a pile foundation obstacle clearing device, including: a drilling machine body 1, a steel casing 2 and a clamping mechanism 3.

[0037] The transmission shaft of the drilling rig body 1 is fixedly connected with a locking head 11, and a splicing frame 12 is arranged at the end of the locking head 11; the steel casing 2 is arranged at the bottom of the splicing frame 12, and a connecting flange 21 is arranged at the lower end of the steel casing 2. A plurality of drill bits 22 are arranged in a circle on the connecting flange 21 to clear the waste piles; the clamping mechanism 3 is arranged around the inner wall of the steel casing 2, and the clamping mechanism 3 includes an arc frame 31, a push rod 32, a clamping plate 33 and a plurality of threaded plug rods 34, and the arc frame 31 is respectively penetrated by the The push rod 32 is arranged around the inner wall of the steel pipe sleeve, and is telescopically arranged in the arc frame 31. The rod head of the push rod 32 is fixedly connected with a connecting block 35, and the connecting block 35 is connected to the rear end of the clamping plate 33. A plurality of mounting grooves 331 are penetrated on the inner side of the clamping plate 33, and a driving motor 332 is arranged in the mounting groove 331. The threaded rod 34 is arranged in the mounting groove 331, and the tail end of the threaded rod 34 is connected to the output end of the driving motor 332, so that the threaded rod 34 is inserted around the outside of the waste pile.

[0038] The pile foundation obstacle removal device can effectively improve the efficiency and safety of waste pile removal; specifically, the drill body 1 drives the steel casing 2 and the drill bit 22 thereon to rotate through the transmission shaft, so as to achieve efficient removal of waste piles; at the same time, the design of the clamping mechanism 3 enables the waste piles to be firmly grasped during the obstacle removal process to prevent them from loosening or falling off, thereby ensuring safe and reliable operation, that is, after the steel casing 2 is lowered to a predetermined position, the clamping plate 33 is pushed out toward the outer surface of the waste pile by the telescopic push rod 32, and during the pushing process, the output end of the driving motor 332 drives the threaded insertion rod 34 to rotate in the placement groove 331, so that when the clamping plate 33 is attached to the outer surface of the waste pile, the threaded differential rod can be inserted into the waste pile for fixing, thereby ensuring the stability of the waste pile when following the rise of the steel casing 2; in addition, the entire device has a compact structure and is easy to operate, which is convenient for rapid installation and disassembly on site, thereby improving construction efficiency.

[0039] refer to Figure 4 and Figure 5 In the present embodiment, more specifically, a support seat 36 is provided in the arc frame 31, and a driving cylinder 37 is provided at one end of the support seat 36. The output end of the driving cylinder 37 is connected to the tail end of the push rod 32, so that the push rod 32 drives the clamping plate 33 to clamp the waste pile, and can accurately control the clamping force of the clamping plate 33 on the waste pile, thereby ensuring stability during the lifting process and avoiding the waste pile from slipping or being damaged due to improper clamping; at the same time, the setting of the driving cylinder 37 makes the entire clamping operation more flexible and reliable, thereby improving work efficiency and safety.

[0040] refer to Figure 2 and Figure 3 In the present embodiment, more specifically, a splicing plate 121 is provided at the bottom of the outer end of the splicing frame 12, and a connecting plate 23 is provided on the outside of the top port of the steel casing 2. Positioning holes are provided through the splicing plate 121 and the connecting plate 23, and a positioning rod 24 is provided in the positioning hole. Both ends of the positioning rod 24 are fastened to the splicing plate 121 and the connecting plate 23 by nuts. The connection between the splicing frame 12 and the steel casing 2 is more stable and reliable, and loosening or falling off due to vibration during the obstacle clearance process is effectively prevented; at the same time, the design of the positioning hole and the positioning rod 24 can quickly and accurately realize the docking of the splicing frame 12 and the steel casing 2, thereby improving the installation efficiency; in addition, the nut fastening method facilitates rapid disassembly and maintenance on site, thereby improving the flexibility and adaptability of the equipment.

[0041] refer to Figure 3 In the present embodiment, more specifically, limiting grooves 122 are provided on all sides of the top of the splicing plate 121, and limiting rods 25 are provided on the outside of the positioning rod 24 relative to the limiting grooves 122, and the limiting rods 25 are clamped in the limiting grooves 122. The splicing plate 121 and the connecting plate 23 can not only be fastened by the positioning rods 24 and nuts, but also the design of limiting grooves 122 and limiting rods 25 is added, so that the positioning rods 24 are more stable during installation, and loosening problems caused by vibration or impact are avoided, thereby improving the overall stability of the device; at the same time, the limiting rods 25 are clamped in the limiting grooves 122, which further enhances the connection strength between the splicing plate 121 and the connecting plate 23, ensures the reliable docking of the steel casing 2 with the drilling rig body 1, and improves the safety and reliability in the process of clearing the waste piles.

[0042] refer to Figure 1 In this embodiment, more specifically, a lifting rope 13 is provided on the top of the drilling rig body 1 for connecting with a crane at the construction site. The lifting rope 13 can be conveniently connected with the crane at the construction site, which is convenient for the overall lifting and movement of the drilling rig body 1 and improves the construction efficiency and safety.

[0043] The implementation principle of a pile foundation obstacle clearing device in an embodiment of the present application is as follows: the drill body 1 drives the steel casing 2 and the drill bit 22 thereon to rotate through the transmission shaft, thereby achieving efficient removal of waste piles; at the same time, the design of the clamping mechanism 3 enables the waste piles to be firmly grasped during the obstacle clearing process to prevent them from loosening or falling off, thereby ensuring safe and reliable operation. The lifting rope 13 of the drill body 1 is connected to the crane at the construction site, which facilitates the overall lifting and movement of the drill body 1, thereby improving construction efficiency and safety.

[0044] Example 2, reference Figure 7 , a pile foundation reinforcement construction method, comprising the following construction steps: Determine the clearing position of the pile foundation, prepare the clearing device and related auxiliary equipment, drive the steel casing 2 at the splicing frame 12 to rotate at the corresponding clearing position of the waste pile through the transmission shaft of the drilling machine body 1, and clear the waste pile through the drill bit 22 at the steel casing 2, lift the drilling machine body 1 by the crane, lift the steel casing 2, and the waste pile is used in conjunction with the clamping mechanism 3 in the steel casing 2, and stably follows the steel casing 2 to be lifted from the drill hole; Backfill the hole depth with fluidized solidified soil, and complete the backfill before the fluidized solidified soil begins to solidify; ensure that after the fluidized soil solidifies, it forms a good dense soil layer with the soil layer around the hole wall to meet the bearing capacity of the on-site construction machinery; In the affected area around the drill hole, cement soil mixing soil reinforcement 4 is carried out through mixing piles to ensure that the cement soil is fully and evenly mixed in pairs, presenting a four-leaf clover reinforcement form, and after forming, new piles 5 are drilled. After the drilling is completed, the bundled steel cage is placed in the hole of the new pile 5, and concrete is poured to finally form the new pile 5.

[0045] This pile foundation reinforcement construction method can effectively solve the impact of waste piles on the construction of new piles 5; firstly, through the coordinated use of the drilling rig body 1 and the steel casing 2, the waste piles can be efficiently removed to ensure the safety and reliability of the obstacle removal process; secondly, the clamping mechanism 3 is used to stably lift the waste piles, avoiding the risk of the waste piles falling off during the lifting process, thereby improving the working efficiency; in addition, when backfilling the hole depth, fluidized solidified soil is used and its uniformity is ensured, so that the backfilled soil has a higher density and bearing capacity, meeting the requirements of subsequent construction; finally, cement soil mixing reinforcement is carried out through mixing piles, which not only enhances the stability of the surrounding soil, but also forms a good four-leaf clover reinforcement structure, further improving the overall performance of the entire construction area.

[0046] In this embodiment, more specifically, the bottom depth of the hole after clearing is greater than the length of the waste pile by 10m~15m. For example, the waste pile on site is 49m long and 800mm~1200mm in diameter, and the bottom depth of the hole after clearing is 60m, which can ensure that the waste pile and its residual parts are completely removed, avoiding the impact of incomplete cleaning of the waste pile on the construction quality of the subsequent new pile 5. At the same time, the increased depth can effectively prevent potential geological problems, improve the foundation stability of the new pile 5, and enhance the safety and reliability of the overall structure.

[0047] In this embodiment, more specifically, the obstacle clearing hole depth is greater than the physical detection theoretical depth of 500mm, and the depth is reviewed during the drilling process to avoid incomplete obstacle clearing due to changes in geological conditions or detection errors. At the same time, real-time review of the depth during the drilling process can promptly discover and correct possible deviations, further improve construction accuracy and quality, and ensure the safety and reliability of subsequent pile foundation reinforcement.

[0048] In this embodiment, more specifically, the reinforcement depth of the mixing pile is 2m deeper than the hole depth after obstacle clearing, which can further improve the stability of the new pile 5 and ensure that the new pile 5 has better compressive resistance and bearing capacity when subjected to force. The increased reinforcement depth of 2m helps prevent soil loosening or collapse, thereby reducing uneven settlement of the soil around the new pile 5 and improving the safety of the entire structure. This design can also better form a close bond with the original soil layer, increase the friction between the new pile 5 and the surrounding soil, and improve the stability of the overall structure.

[0049] In this embodiment, more specifically, during the backfilling process of the fluidized solidified soil, the fluidized solidified soil is evenly stirred by a stirring device until there is no mud clotting, thereby ensuring the uniformity and fluidity of the fluidized solidified soil and avoiding the problem of poor backfilling quality due to mud clotting, thereby ensuring the density and stability of the fluidized solidified soil during the backfilling process at the hole depth, and further enhancing the bearing capacity of the soil layer around the hole wall.

[0050] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A pile foundation obstacle removal device, characterized in that: include: A drilling machine body (1), wherein a transmission shaft of the drilling machine body (1) is fixedly connected to a locking head (11), and a splicing frame (12) is provided at the end of the locking head (11); A steel casing (2) is arranged at the bottom of the splicing frame (12), a connecting flange (21) is arranged at the lower end of the steel casing (2), and a plurality of drill bits (22) are arranged in a circle on the connecting flange (21) for clearing the waste piles; The clamping mechanism (3) is arranged around the inner wall of the steel casing (2). The clamping mechanism (3) comprises an arc frame (31), a push rod (32), a clamping plate (33) and a plurality of threaded plug rods (34). The arc frame (31) is respectively arranged around the inner wall of the steel pipe sleeve. The push rod (32) is telescopically arranged in the arc frame (31). The rod head of the push rod (32) is fixedly connected with a connecting block (35). The connecting block (35) is connected to the rear end of the clamping plate (33). The inner side of the clamping plate (33) is penetrated by a plurality of placement grooves (331). A driving motor (332) is arranged in the placement groove (331). The threaded plug rod (34) is arranged in the placement groove (331). The tail end of the threaded plug rod (34) is connected to the output end of the driving motor (332), so that the threaded plug rod (34) is inserted to the periphery of the outside of the waste pile.

2. A pile foundation obstacle removal device according to claim 1, characterized in that: A support seat (36) is arranged in the arc frame (31), a driving cylinder (37) is arranged at one end of the support seat (36), and an output end of the driving cylinder (37) is connected to the tail end of the push rod (32), so that the push rod (32) drives the clamping plate (33) to clamp the waste pile.

3. A pile foundation obstacle removal device according to claim 1, characterized in that: A splicing plate (121) is provided at the bottom of the outer end of the splicing frame (12), and a connecting plate (23) is provided outside the top port of the steel casing (2). Positioning holes are provided through the splicing plate (121) and the connecting plate (23), and a positioning rod (24) is provided in the positioning hole. Both ends of the positioning rod (24) are fastened to the splicing plate (121) and the connecting plate (23) by nuts.

4. A pile foundation obstacle removal device according to claim 3, characterized in that: Limiting grooves (122) are provided on all four sides of the top of the splicing plate (121), and a limiting rod (25) is provided outside the positioning rod (24) and extends inside the limiting groove (122), and the limiting rod (25) is clamped in the limiting groove (122).

5. A pile foundation obstacle removal device according to claim 1, characterized in that: A lifting rope (13) is provided on the top of the drilling machine body (1) for connecting to a crane at the construction site.

6. A pile foundation reinforcement construction method, characterized in that: The construction steps include: Determine the clearing position of the pile foundation, prepare a clearing device and related auxiliary equipment, drive the steel casing (2) at the splicing frame (12) to rotate at the corresponding clearing position of the waste pile through the transmission shaft of the drilling machine body (1), and clear the waste pile through the drill bit (22) at the steel casing (2), lift the drilling machine body (1) with a crane, lift the steel casing (2), and the waste pile is used in conjunction with the clamping mechanism (3) in the steel casing (2) to stably follow the steel casing (2) and be lifted from the drill hole; Backfill the hole depth with fluidized solidified soil, and complete the backfill before the fluidized solidified soil begins to solidify; ensure that after the fluidized soil solidifies, it forms a good dense soil layer with the soil layer around the hole wall to meet the bearing capacity of the on-site construction machinery; In the affected area around the borehole, cement soil is mixed and reinforced (4) by mixing piles to ensure that the cement soil is fully and evenly mixed in pairs, presenting a four-leaf clover reinforcement form, and after forming, a new pile (5) is drilled. After the drilling is completed, the tied steel cage is placed in the hole of the new pile (5) and concrete is poured to finally form a new pile (5).

7. A pile foundation reinforcement construction method according to claim 6, characterized in that: The depth of the hole bottom after clearing the obstacles is 10m to 15m greater than the length of the waste pile.

8. A pile foundation reinforcement construction method according to claim 6, characterized in that: The obstacle clearing and drilling depth is greater than the theoretical depth of 500 mm in physical detection, and the depth is reviewed during the drilling process.

9. A pile foundation reinforcement construction method according to claim 6, characterized in that: The reinforcement depth of the mixing pile is 2m deeper than the hole depth after obstacle clearing.

10. A pile foundation reinforcement construction method according to claim 6, characterized in that: During the backfilling process of the fluidized solidified soil, the fluidized solidified soil is uniformly stirred by a stirring device until there is no mud lumps, thereby ensuring the uniformity and fluidity of the fluidized solidified soil.

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