Building pile foundation hole forming equipment of rotary drilling rig and construction method of building pile foundation hole forming equipment

Abstract

The invention relates to rotary drilling rig building pile foundation hole forming equipment and a construction method thereof, and relates to the technical field of rotary drilling rig equipment.The rotary drilling rig building pile foundation hole forming equipment comprises a vehicle body, a driving assembly is slidably connected to a suspension arm of the vehicle body in a limiting mode, a second winding assembly is arranged below the driving assembly, and an extension rod is arranged at the bottom end of the driving assembly; a transmission rod is arranged at the bottom end of the extension rod, a drill bit is fixedly connected to the bottom end of the transmission rod, the transmission rod is sleeved with an upper drilling cylinder, the upper drilling cylinder is provided with a limiting assembly, a lower drilling cylinder is sleeved with the lower portion of the interior of the upper drilling cylinder, and two racks are symmetrically and fixedly welded to the top end of the lower drilling cylinder. Two servo motors are fixedly arranged at the top end of the upper drilling barrel through bolts, the output ends of the two servo motors are each connected with a gear, and the arrangement of the structure can enlarge the soil storage space between the upper drilling barrel and the lower drilling barrel, so that the frequency of removing the upper drilling barrel and the lower drilling barrel out of a drilled hole for soil discharging is reduced; the construction efficiency of the whole device is improved.

Description

Technical Field

[0001] The present application relates to the technical field of rotary drilling rig equipment, and in particular to a rotary drilling rig construction pile foundation hole-forming equipment and a construction method thereof. Background Art

[0002] In the pile foundation construction process of roads, bridges and large-scale infrastructure, rotary drilling rig cast-in-place pile construction is one of the important construction equipment, and rotary drilling rig construction has many characteristics such as fast hole-making speed, high hole-making quality, low noise, low environmental pollution, high degree of mechanization, and low labor intensity of workers. Whether it is an imported drilling rig or a domestic drilling rig, the structural form and working principle are similar, but the strata under construction vary greatly, and the specific construction technical requirements are different.

[0003] During the construction process of the existing rotary drilling rig pile foundation drilling equipment, the size of the drill barrel is fixed and cannot be adjusted, and the storage space of the drill barrel for the amount of soil is fixed and cannot be changed at will. When a certain amount of soil is stored in the internal space of the drill barrel, the drill barrel needs to be taken out of the borehole, and the storage space of the drill barrel for the amount of soil cannot be further increased by adjusting the size of the drill barrel, which leads to a decrease in the efficiency of the construction project.

[0004] In view of the above situation, we propose a rotary drilling rig building pile foundation hole-forming equipment and a construction method thereof based on the existing technology. Summary of the invention

[0005] The purpose of the present application is to provide a rotary drilling rig building pile foundation hole-forming equipment and a construction method thereof.

[0006] In the first aspect, the present application provides a rotary drilling rig construction pile foundation hole forming device adopts the following technical solution: A rotary drilling rig for building pile foundation hole-forming equipment comprises a body, a boom is installed and connected to the body through a connecting frame, the boom is slidably connected to a driving assembly in an upper limit position, a second winding assembly is arranged below the driving assembly, an extension rod is arranged at the bottom of the driving assembly, the extension rod passes through the second winding assembly, a transmission rod is arranged at the bottom of the extension rod, a drill bit is fixedly connected to the bottom of the transmission rod, an upper drill barrel is sleeved on the outer side of the transmission rod, a limit assembly connected to the transmission rod is arranged on the upper drill barrel, a lower drill barrel is sleeved at the lower part of the upper drill barrel, two racks are symmetrically fixedly welded on the top of the lower drill barrel, two servo motors are bolted to the top of the upper drill barrel, and output ends of the two servo motors are connected to a gear, and the two gears are respectively meshed with the two racks.

[0007] By adopting the above technical scheme, first, the extension rod, the transmission rod, the second winding assembly arranged below the driving assembly, and the upper drill barrel and the lower drill barrel arranged on the outside of the transmission rod are driven to rotate by the driving assembly, and then the pile foundation hole is drilled by the rotating upper drill barrel and the lower drill barrel. During the drilling process, the soil will enter the storage space formed between the upper drill barrel and the lower drill barrel. As the soil in the storage space increases, the power supply of the servo motor on the upper drill barrel is turned on, and the gear is driven to rotate by the servo motor. Then, the upper drill barrel is moved up through the engagement of the rotating gear and the rack, so that the storage space for soil between the upper drill barrel and the lower drill barrel is expanded, so that the upper drill barrel and the lower drill barrel can store more soil, reducing the number of times the upper drill barrel and the lower drill barrel are moved out of the borehole to discharge soil, thereby improving the construction efficiency of the entire device.

[0008] Furthermore, the limit assembly includes an electric push rod, a slot, and a block. Two electric push rods are symmetrically fixed on the top of the upper drill tube. The output ends of the two electric push rods are fixedly connected to a block. The surface of the transmission rod is symmetrically fixed with two slots that are engaged with the block.

[0009] By adopting the above technical solution, in actual use, the two electric push rods respectively drive the two clamping blocks away from or close to the clamping grooves provided on the surface of the transmission rod, so as to quickly disassemble or fix the upper drill tube and the transmission rod.

[0010] Furthermore, a crawler-type base for driving the entire device is arranged under the vehicle body, and a frame is arranged on the vehicle body.

[0011] By adopting the above technical solution, the setting of the crawler base can drive the vehicle body and the various components arranged on the vehicle body to move, so that it can be moved to the construction site. At the same time, the vehicle body can be rotated in the horizontal direction on the crawler base, which is convenient for the rotation of the vehicle body and the construction of various components on the vehicle body. At the same time, the frame set on the vehicle body can support the boom that is subsequently rotated to the horizontal direction.

[0012] Furthermore, a first winding assembly is provided on the vehicle body, a winding end of the first winding assembly is connected to a first steel cable, and the other end of the first steel cable is fixedly connected to the driving assembly.

[0013] By adopting the above technical solution, the first steel cable can be retracted and released by the first winding assembly during use, and then the driving assembly fixedly connected to the other end of the first steel cable and various components arranged under the driving assembly can be moved up and down and adjusted by the retracted first steel cable.

[0014] Furthermore, a second steel cable is provided at the reeling end of the second reeling assembly, and the second steel cable is fixedly connected to the top end of the upper drill tube.

[0015] By adopting the above technical solution, the second winding assembly can retract and move the upper drill tube and the lower drill tube fixedly connected at one end thereof up and down through the second steel cable, so that the upper drill tube and the lower drill tube moved upward are removed from the outside of the transmission rod.

[0016] Furthermore, the bottom wall of the lower drill tube is connected to a bottom plate in a limited rotation manner, and a driving cylinder for flipping and opening the bottom plate is arranged in the lower drill tube.

[0017] By adopting the above technical solution, the bottom plate arranged on the bottom wall of the lower drill barrel can be flipped on the bottom wall of the lower drill barrel through the driving cylinder arranged in the lower drill barrel, and then the bottom wall of the lower drill barrel is opened, and then the soil stored in the storage space formed between the upper drill barrel and the lower drill barrel is quickly discharged, so that the upper drill barrel and the lower drill barrel can continue to carry out subsequent drilling operations.

[0018] Furthermore, a through slot is provided at the top of the upper drill tube, and the extension rod and the transmission rod can movably pass through the through slot.

[0019] By adopting the above technical solution, the opening size of the through groove here just matches the cross-sectional size of the extension rod and the transmission rod, and the upper drill tube can smoothly pass through the extension rod and the transmission rod, so that the upper drill tube can smoothly shuttle back and forth on the outside of the extension rod and the transmission rod.

[0020] Furthermore, the bottom end of the extension rod is fixedly connected to a limiting block, the top end of the transmission rod is provided with a limiting hole which is engaged with the limiting block, the extension rod and the transmission rod are fixedly connected by a limiting bolt, the side wall of the transmission rod is provided with an avoidance groove, and the limiting bolt is arranged in the avoidance groove.

[0021] By adopting the above technical scheme, when it is necessary to discharge the soil in the storage space formed by the upper drill tube and the lower drill tube on the transmission rod, the upper drill tube and the lower drill tube can be slid from the outside of the transmission rod to the outside of the extension rod, and then the limit bolt in the avoidance groove is rotated to release the fixation between the extension rod and the transmission rod, so that the limit block is pulled out from the limit hole, and then the upper drill tube and the lower drill tube are directly rotated to the soil stacking prescription, so that the soil between the upper drill tube and the lower drill tube can be discharged, reducing the distance and work done by the upper drill tube and the lower drill tube when moving up to discharge the soil. At the same time, the transmission rod still remains in the drilled hole, which can play a certain role in ensuring the positioning accuracy of the subsequent upper drill tube and the lower drill tube when they are put back into the hole.

[0022] In a second aspect, a method for forming a hole for a pile foundation using a rotary drilling rig is provided, the method comprising the following steps: Step 1: First, the entire device is moved to the location where the hole is to be drilled through the crawler base arranged on the bottom wall of the vehicle body, and the upper drill tube and the lower drill tube are moved to the top of the mark point where the hole is to be drilled. Then, the first winding assembly moves the driving assembly and the upper drill tube and the lower drill tube arranged below the driving assembly downward through the first steel cable, and the drilling operation is performed through the upper drill tube and the lower drill tube; Step 2: When drilling, the servo motor drives the gear to rotate, and then the rotating gear is engaged with the rack, so that the lower drill tube is moved away from the upper drill tube, thereby expanding the storage space of the soil between the upper drill tube and the lower drill tube, so as to store more soil; Step 3: The second winding assembly drives the upper drill tube and the lower drill tube to slide upward through the second steel cable. At this time, the transmission rod is still inside the borehole. Then, the upper drill tube and the lower drill tube are completely moved upward and slid onto the extension rod, and then the limit fixing connection between the extension rod and the transmission rod is disconnected; Step 4: Then rotate the vehicle body and the boom disposed on the vehicle body and the upper drill tube and the lower drill tube disposed on the boom to the soil pile, and then remove the soil loaded in the storage space between the upper drill tube and the lower drill tube, and then carry out subsequent drilling operations.

[0023] In summary, the present application includes at least one of the following beneficial technical effects: 1. The rotary drilling rig construction pile foundation hole-forming equipment and the construction method thereof involved in the present application can expand the storage space of the soil between the upper drill tube and the lower drill tube, thereby reducing the number of times the upper drill tube and the lower drill tube are moved out of the borehole to discharge the soil, thereby improving the construction efficiency of the entire device; 2. In the present application, by means of a rack of sufficient length and a gear meshing with the rack, the upper drill tube and the lower drill tube can be opened, thereby facilitating the cleaning of sand, gravel and soil adhered to the inner walls of the upper drill tube and the lower drill tube, thereby improving the practicability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall three-dimensional structure of this application; Figure 2 It is a schematic diagram of a local three-dimensional structure in this application; Figure 3 It is a partially disassembled three-dimensional schematic diagram in this application; Figure 4 It is a schematic diagram of the disassembled structure of the extension rod and the transmission rod in this application; Figure 5 It is a schematic diagram of the local three-dimensional structure of the boom in this application.

[0025] Explanation of the reference numerals in the accompanying drawings: 1. vehicle body; 2. crawler base; 3. vehicle frame; 4. first winding assembly; 5. first steel cable; 6. boom; 7. driving assembly; 8. second winding assembly; 9. extension rod; 10. transmission rod; 11. drill bit; 12. upper drill tube; 13. lower drill tube; 14. bottom plate; 15. electric push rod; 16. slot; 17. block; 18. second steel cable; 19. driving cylinder; 20. through slot; 21. rack; 22. gear; 23. servo motor; 24. limit hole; 25. limit block; 26. limit bolt; 27. avoidance groove. DETAILED DESCRIPTION

[0026] The following is combined with Figure 1 - Attachment Figure 5 , further details of this application are given.

[0027] Embodiment 1: The present application provides a rotary drilling rig construction pile foundation hole forming device adopts the following technical solution: A rotary drilling rig for building pile foundation hole-forming equipment comprises a body 1, a boom 6 is installed and connected to the body 1 through a connecting frame, a driving assembly 7 is slidably connected to the boom 6 in an upper limit position, a second winding assembly 8 is arranged below the driving assembly 7, an extension rod 9 is arranged at the bottom end of the driving assembly 7, the extension rod 9 passes through the second winding assembly 8, a transmission rod 10 is arranged at the bottom end of the extension rod 9, a drill bit 11 is fixedly connected to the bottom end of the transmission rod 10, an upper drill tube 12 is sleeved on the outer side of the transmission rod 10, a limit assembly engaged with the transmission rod 10 is arranged on the upper drill tube 12, a lower drill tube 13 is sleeved at the lower part of the upper drill tube 12, two racks 21 are symmetrically fixed and welded on the top of the lower drill tube 13, two servo motors 23 are bolted and fixed on the top end of the upper drill tube 12, output ends of the two servo motors 23 are connected with a gear 22, and the two gears 22 are respectively meshed with the two racks 21.

[0028] By adopting the above technical scheme, firstly, the extension rod 9, the transmission rod 10, the second winding assembly 8 arranged below the driving assembly 7, and the upper drill tube 12 and the lower drill tube 13 sleeved on the outside of the transmission rod 10 are driven to rotate by the driving assembly 7, and then the pile foundation hole is drilled by the rotating upper drill tube 12 and the lower drill tube 13, and the soil in the drilling process will enter the storage space formed between the upper drill tube 12 and the lower drill tube 13. As the soil in the storage space increases, the power supply of the servo motor 23 on the upper drill tube 12 is turned on, and the gear 22 is driven to rotate by the servo motor 23. Then, the upper drill tube 12 is moved up through the engagement of the rotating gear 22 with the rack 21, so that the storage space for soil between the upper drill tube 12 and the lower drill tube 13 is expanded, so that the upper drill tube 12 and the lower drill tube 13 can store more soil, reduce the number of times the upper drill tube 12 and the lower drill tube 13 are moved out of the borehole to discharge soil, and improve the construction efficiency of the entire device.

[0029] The limiting assembly includes an electric push rod 15, a slot 16, and a block 17. Two electric push rods 15 are symmetrically fixedly arranged on the top of the upper drill tube 12. The output ends of the two electric push rods 15 are fixedly connected to a block 17. The surface of the transmission rod 10 is symmetrically fixed with two slots 16 that are engaged with the block 17.

[0030] By adopting the above technical solution, in actual use, the two electric push rods 15 respectively drive the two clamping blocks 17 away from or close to the clamping grooves 16 provided on the surface of the transmission rod 10, so as to quickly disassemble or fix the upper drill tube 12 and the transmission rod 10.

[0031] A crawler base 2 for driving the entire device is arranged under the vehicle body 1, and a frame 3 is arranged on the vehicle body 1. Here, the crawler base 2 adopts the existing technology, such as: the mobile crawler in the Kato HD512III excavator can be adopted, which will not be repeated here.

[0032] By adopting the above-mentioned technical solution, the setting of the crawler base 2 can drive the vehicle body 1 and the various components arranged on the vehicle body 1 to move, so that they are moved to the construction site. At the same time, the vehicle body 1 can be rotated in the horizontal direction on the crawler base 2, which is convenient for the rotation of the vehicle body 1 and the construction of various components on the vehicle body 1. At the same time, the frame 3 arranged on the vehicle body 1 can support the boom 6 that is subsequently rotated to the horizontal direction.

[0033] A first winding assembly 4 is provided on the vehicle body 1 , a winding end of the first winding assembly 4 is connected to a first steel cable 5 , and the other end of the first steel cable 5 is fixedly connected to the driving assembly 7 .

[0034] By adopting the above technical solution, the first steel cable 5 can be retracted and released by the first winding component 4 during use, and then the driving component 7 fixedly connected to the other end of the first steel cable 5 and the various components arranged under the driving component 7 can be moved up and down and adjusted by the retracted first steel cable 5.

[0035] A second steel cable 18 is disposed at the reeling end of the second reeling assembly 8 , and the second steel cable 18 is fixedly connected to the top end of the upper drill tube 12 .

[0036] By adopting the above technical solution, the second winding assembly 8 can retract and move the upper drill tube 12 and the lower drill tube 13 fixedly connected at one end thereof up and down through the second steel cable 18, so that the upper drill tube 12 and the lower drill tube 13 moved upward are removed from the outside of the transmission rod 10.

[0037] The bottom wall of the lower drill tube 13 is connected to the bottom plate 14 in a limited rotation manner, and a driving cylinder 19 for flipping and opening the bottom plate 14 is arranged in the lower drill tube 13 .

[0038] By adopting the above technical solution, a driving cylinder 19 is arranged in the lower drill barrel 13, and the driving cylinder 19 is hingedly connected between the inner wall of the lower drill barrel 13 and the bottom plate 14. When in use, the output end of the driving cylinder 19 pushes the bottom plate 14 to flip on the bottom wall of the lower drill barrel 13, and then the bottom wall of the lower drill barrel 13 is opened, and then the soil stored in the storage space formed between the upper drill barrel 12 and the lower drill barrel 13 is quickly discharged, so that the upper drill barrel 12 and the lower drill barrel 13 can continue to carry out subsequent drilling operations.

[0039] A through slot 20 is formed at the top of the upper drill tube 12 , and the extension rod 9 and the transmission rod 10 can movably pass through the through slot 20 .

[0040] By adopting the above technical solution, the opening size of the through groove 20 here just matches the cross-sectional size of the extension rod 9 and the transmission rod 10, and the upper drill tube 12 can smoothly pass through the extension rod 9 and the transmission rod 10, so that the upper drill tube 12 can smoothly shuttle back and forth on the outside of the extension rod 9 and the transmission rod 10.

[0041] The bottom end of the extension rod 9 is fixedly connected to the limit block 25, and the top end of the transmission rod 10 is provided with a limit hole 24 which is engaged with the limit block 25. The extension rod 9 and the transmission rod 10 are fixedly connected by a limit bolt 26. The side wall of the transmission rod 10 is provided with an avoidance groove 27, and the limit bolt 26 is arranged in the avoidance groove 27.

[0042] By adopting the above technical scheme, when it is necessary to discharge the soil in the storage space formed by the upper drill tube 12 and the lower drill tube 13 on the transmission rod 10, the upper drill tube 12 and the lower drill tube 13 can be slid from the outside of the transmission rod 10 to the outside of the extension rod 9, and then the limit bolt 26 in the avoidance groove 27 is rotated to release the fixation between the extension rod 9 and the transmission rod 10, so that the limit block 25 is pulled out from the limit hole 24, and then the upper drill tube 12 and the lower drill tube 13 are directly rotated to the soil stacking prescription, so that the soil between the upper drill tube 12 and the lower drill tube 13 can be discharged, reducing the distance and work done by the upper drill tube 12 and the lower drill tube 13 when discharging soil. At the same time, the transmission rod 10 still remains in the drilled hole, which can play a certain role in ensuring the positioning accuracy of the subsequent upper drill tube 12 and the lower drill tube 13 put back into the hole.

[0043] Embodiment 2, a method for forming a hole for a pile foundation using a rotary drilling rig, the method comprising the following steps: Step 1: First, the crawler base 2 provided on the bottom wall of the vehicle body 1 is used to move the entire device to the location where the hole is to be drilled, and the upper drill tube 12 and the lower drill tube 13 are moved to the top of the mark point where the hole is to be drilled. Then, the first winding assembly 4 moves the driving assembly 7 and the upper drill tube 12 and the lower drill tube 13 provided under the driving assembly 7 downward through the first steel cable 5, and the drilling operation is performed through the upper drill tube 12 and the lower drill tube 13; Step 2: When drilling, the servo motor 23 drives the gear 22 to rotate, and then the rotating gear 22 is engaged with the rack 21, so that the lower drill tube 13 is moved away from the upper drill tube 12, thereby expanding the storage space of the soil between the upper drill tube 12 and the lower drill tube 13, so as to store more soil; Step 3: The second winding assembly 8 drives the upper drill tube 12 and the lower drill tube 13 to slide upward through the second steel cable 18. At this time, the transmission rod 10 is still inside the borehole. Then, the upper drill tube 12 and the lower drill tube 13 are completely moved upward and slid onto the extension rod 9. Then, the limit fixing connection between the extension rod 9 and the transmission rod 10 is disconnected. Step 4: Then rotate the vehicle body 1 and the boom 6 arranged on the vehicle body 1 and the upper drill tube 12 and the lower drill tube 13 arranged in the row of the boom 6 to the soil pile, and then remove the soil loaded in the storage space between the upper drill tube 12 and the lower drill tube 13, and then carry out subsequent drilling operations.

[0044] By adopting the above technical scheme, on the one hand, the storage space for soil between the upper drill tube 12 and the lower drill tube 13 can be expanded, thereby reducing the number of times the upper drill tube 12 and the lower drill tube 13 are moved out of the borehole to discharge the soil, thereby improving the construction efficiency of the entire device; on the other hand, the upper drill tube 12 and the lower drill tube 13 can be opened, thereby facilitating the cleaning of sand and soil adhered to the inner walls of the upper drill tube 12 and the lower drill tube 13, thereby improving the practicability of the device.

[0045] The implementation principle of the embodiment of the present application is as follows: first, the crawler base 2 arranged on the bottom wall of the vehicle body 1 is used to move the entire device to the location where the hole is to be drilled, and the upper drill tube 12 and the lower drill tube 13 are moved to the top of the mark point where the hole is to be drilled, and then the first winding assembly 4 moves the driving assembly 7 and the upper drill tube 12 and the lower drill tube 13 arranged below the driving assembly 7 downward through the first steel cable 5, and then the extension rod 9, the transmission rod 10 and the second winding assembly 8 arranged below the driving assembly 7 and the upper drill tube 12 and the lower drill tube 13 outside the transmission rod 10 are driven to rotate through the driving assembly 7, and then the drilling operation is performed by the rotating upper drill tube 12 and the lower drill tube 13. When the upper drill tube 12 and the lower drill tube 13 are drilling, The soil in the drilled hole will enter the storage space formed between the upper drill tube 12 and the lower drill tube 13 through the notch opened on the bottom plate 14. As the soil in the storage space increases, at this time, the top of the upper drill tube 12 is fixedly connected to the electromechanical box by bolts. A battery and a controller are arranged in the electromechanical box, which can provide power for the electric push rod 15 and the servo motor 23, so that the servo motor 23 drives the gear 22 to rotate, and then the rotating gear 22 is engaged with the rack 21, so that the lower drill tube 13 is moved away from the upper drill tube 12, thereby expanding the storage space for soil between the upper drill tube 12 and the lower drill tube 13, so as to store more soil, reduce the number of times the upper drill tube 12 and the lower drill tube 13 are moved out of the borehole to discharge soil, and improve the construction efficiency of the entire device. At the same time, when it is necessary to discharge the soil in the storage space between the upper drill tube 12 and the lower drill tube 13, the two electric push rods 15 respectively drive the two blocks 17 to move away from or approach the slot 1 opened on the surface of the transmission rod 10. 6, so as to quickly disassemble or fix the upper drill tube 12 and the transmission rod 10, and then the second winding assembly 8 drives the upper drill tube 12 and the lower drill tube 13 to move upward through the second steel cable 18, and slides the upper drill tube 12 and the lower drill tube 13 from the outside of the transmission rod 10 to the outside of the extension rod 9, and then rotates the limit bolt 26 in the avoidance groove 27 to release the fixation between the extension rod 9 and the transmission rod 10, so that the limit block 25 is pulled out of the limit hole 24, and then directly rotates the vehicle body 1, thereby making the upper drill tube 12 , the lower drill tube 13 rotates to the soil stacking prescription, and then the driving cylinder 19 controls the bottom plate 14 at the bottom of the lower drill tube 13 to flip and open, so that the soil between the upper drill tube 12 and the lower drill tube 13 can be discharged. Here, the extension rod 9 is disconnected from the transmission rod 10, which reduces the distance and work of the upper drill tube 12 and the lower drill tube 13 when discharging soil. At the same time, the transmission rod 10 still remains in the drilled hole, which can play a certain role in ensuring the positioning accuracy of the subsequent upper drill tube 12 and the lower drill tube 13 when they are put back into the hole.

[0046] The embodiments of this specific implementation are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. The same components are represented by the same figure marks. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A rotary drilling rig for building pile foundation drilling equipment, comprising a body (1), characterized in that: The vehicle body (1) is connected to a boom (6) via a connecting frame, the boom (6) is slidably connected to a driving assembly (7) at an upper limit position, a second winding assembly (8) is arranged below the driving assembly (7), an extension rod (9) is arranged at the bottom end of the driving assembly (7), the extension rod (9) passes through the second winding assembly (8), a transmission rod (10) is arranged at the bottom end of the extension rod (9), a drill bit (11) is fixedly connected to the bottom end of the transmission rod (10), and an upper drill bit (11) is sleeved on the outer side of the transmission rod (10). The upper drill tube (12) is provided with a limit assembly that is snap-connected with the transmission rod (10); a lower drill tube (13) is sleeved at the lower part of the upper drill tube (12); two racks (21) are symmetrically fixed and welded to the top of the lower drill tube (13); two servo motors (23) are bolt-fixed to the top of the upper drill tube (12); output ends of the two servo motors (23) are connected with a gear (22); and the two gears (22) are respectively meshed and connected with the two racks (21).

2. The rotary drilling rig construction pile foundation hole forming equipment according to claim 1, characterized in that: The limit assembly comprises an electric push rod (15), a clamping slot (16), and a clamping block (17); two electric push rods (15) are symmetrically fixedly arranged on the top of the upper drill tube (12); output ends of the two electric push rods (15) are each fixedly connected to a clamping block (17); and the surface of the transmission rod (10) is symmetrically fixedly provided with two clamping slots (16) that are clamped and connected to the clamping block (17).

3. The rotary drilling rig construction pile foundation hole forming equipment according to claim 1, characterized in that: A crawler-type base (2) for driving the entire device is arranged below the vehicle body (1), and a vehicle frame (3) is arranged on the vehicle body (1).

4. The rotary drilling rig construction pile foundation hole forming equipment according to claim 1, characterized in that: The vehicle body (1) is provided with a first winding assembly (4), a winding end of the first winding assembly (4) is connected to a first steel cable (5), and the other end of the first steel cable (5) is fixedly connected to a driving assembly (7).

5. The rotary drilling rig construction pile foundation hole forming equipment according to claim 1, characterized in that: A second steel cable (18) is provided at the reeling end of the second reeling assembly (8), and the second steel cable (18) is fixedly connected to the top end of the upper drill tube (12).

6. The rotary drilling rig construction pile foundation hole forming equipment according to claim 1, characterized in that: The bottom wall of the lower drill tube (13) is connected to a bottom plate (14) in a limited rotational manner, and a driving cylinder (19) for flipping and opening the bottom plate (14) is arranged in the lower drill tube (13).

7. The rotary drilling rig construction pile foundation hole forming equipment according to claim 1, characterized in that: A through slot (20) is provided at the top end of the upper drill tube (12), and the extension rod (9) and the transmission rod (10) can movably pass through the through slot (20).

8. The rotary drilling rig construction pile foundation hole forming equipment according to claim 1, characterized in that: The bottom end of the extension rod (9) is fixedly connected to a limit block (25); the top end of the transmission rod (10) is provided with a limit hole (24) engaged with the limit block (25); the extension rod (9) and the transmission rod (10) are fixedly connected via a limit bolt (26); a side wall of the transmission rod (10) is provided with an avoidance groove (27), and the limit bolt (26) is arranged in the avoidance groove (27).

9. A method for drilling a hole for a building pile foundation using a rotary drilling rig, using the drilling hole equipment for a building pile foundation according to any one of claims 1 to 8, characterized in that: The construction method comprises the following steps: Step 1: First, the entire device is moved to the location where the hole is to be drilled through the crawler base (2) arranged on the bottom wall of the vehicle body (1), and the upper drill tube (12) and the lower drill tube (13) are moved to the position directly above the mark point of the hole to be drilled. Then, the first winding component (4) moves the driving component (7) and the upper drill tube (12) and the lower drill tube (13) arranged below the driving component (7) downward through the first steel cable (5), and the drilling operation is performed through the upper drill tube (12) and the lower drill tube (13); Step 2: When drilling, the servo motor (23) drives the gear (22) to rotate, and then the rotating gear (22) is meshed with the rack (21), so that the lower drill tube (13) is moved away from the upper drill tube (12), thereby expanding the soil storage space between the upper drill tube (12) and the lower drill tube (13), so as to store more soil; Step 3: The second winding assembly (8) drives the upper drill tube (12) and the lower drill tube (13) to move upward and slide through the second steel cable (18). At this time, the transmission rod (10) is still inside the borehole. Then, the upper drill tube (12) and the lower drill tube (13) are completely moved upward and slid onto the extension rod (9). Then, the limit fixing connection between the extension rod (9) and the transmission rod (10) is disconnected. Step 4: Then, the vehicle body (1), the boom (6) disposed on the vehicle body (1), and the upper drill tube (12) and the lower drill tube (13) disposed on the boom (6) are rotated to the soil storage location, and then the soil loaded in the storage space between the upper drill tube (12) and the lower drill tube (13) is removed, and then subsequent drilling operations are performed.

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