Tubular pile machine with down-the-hole hammer drill bit for while-drilling tubular pile and construction method of tubular pile machine

Abstract

The invention discloses a tubular pile machine with a down-the-hole hammer drill bit for a while-drilling tubular pile and a construction method of the tubular pile machine, and belongs to the technical field of tubular pile machines. The tubular pile machine comprises a working platform, a drill rod piece penetrating through the middle of the working platform, a main impactor arranged on the drill rod piece and deviating from the working platform, and a main down-the-hole hammer drill bit arranged at the free end of the main impactor; and the drill rod piece is sleeved with an inward retracting device close to the drill bit of the main down-the-hole hammer. According to the pipe pile machine, the inner collecting device is arranged, the inner collecting device comprises the inner collecting frame and the four auxiliary down-the-hole hammer drill bits arranged around the main down-the-hole hammer drill bit, when the pipe pile machine conducts drilling, the auxiliary down-the-hole hammer drill bits open downwards to adapt to the hole wall, and efficient and stable drilling is guaranteed; and after drilling is completed, the drill bit is directly recycled inwards, extra disassembly is not needed, and the operation efficiency and convenience are greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of pipe pile machines, and in particular to a pipe pile machine having a down-the-hole hammer drill bit for pipe pile drilling and a construction method thereof. Background Art

[0002] The traditional pipe pile driver has a large operating radius, which to a certain extent improves the flexibility and coverage of construction. However, it also brings a series of disadvantages that cannot be ignored, such as high site requirements. The large operating radius also means that the pipe pile driver needs to occupy a wider construction area when operating. This undoubtedly increases the difficulty and cost of construction for projects in densely populated urban areas, small construction sites, or projects with limited surrounding space. It may even lead to the inability to enter the construction site, affecting the progress of the project. Moreover, due to the large size of the equipment, the increase in the operating radius also directly leads to the increased complexity of the pipe pile driver during transportation and on-site installation. This not only requires larger transportation vehicles and lifting equipment, but may also require more complex on-site layout and longer preparation time, thereby increasing the risks and costs of the construction preparation stage. After completing the task of drilling pipe piles, traditional drill bits often require cumbersome disassembly and recycling processes, which is both time-consuming and labor-intensive.

[0003] For example, the invention patent application with the publication number CN113153161B discloses a hard rock cutting drill bit and construction method for drilling and pile driving, wherein the drill bit includes a drill bit body; a drill bit front claw, which is fixed on the bottom end surface of the drill bit body; and an expansion mechanism, which is located outside the bottom end of the drill bit body and includes a movable wing plate and an expansion bullet drill bit. Although the invention increases the rotary drilling radius of the drill bit, the disassembly and recycling of the pile driving machine as a whole still needs to be improved.

[0004] In view of this, the inventor conducted in-depth research on this demand, and thus the present case was produced. Summary of the invention

[0005] In order to solve the problems in the prior art that the traditional pipe pile driver has a large operating radius, is complex to install, and is inconvenient to disassemble and recycle after the traditional drill bit completes the task, the present invention provides a pipe pile driver with a down-the-hole hammer drill bit for pipe pile while drilling and a construction method thereof, which adopts the following technical solutions:

[0006] A pipe pile driver with a down-the-hole hammer drill bit for pipe pile following drilling, comprising a working platform, a drill rod member is arranged through the middle part of the working platform, a main impactor is arranged at the end of the drill rod member away from the working platform, a main down-the-hole hammer drill bit is arranged at the free end of the main impactor, and an inward retraction device is arranged on the drill rod member near the main down-the-hole hammer drill bit sleeve; the inward retraction device comprises an inward retraction frame and four auxiliary down-the-hole hammer drill bits arranged around the main down-the-hole hammer drill bit, the auxiliary down-the-hole hammer drill bits are connected to the bottom of the inward retraction frame through four auxiliary impactors, the inward retraction frame is movably connected to the drill rod member, and four frame rods are arranged on the inward retraction frame for limiting the inward retraction of the four auxiliary impactors, one end of the frame rod is movably connected to the inward retraction frame by a first bolt, and the other end of the frame rod is movably connected to the auxiliary impactor by a second bolt.

[0007] By setting the retraction device, the retraction device includes a retraction frame and four auxiliary down-the-hole hammer bits arranged around the main down-the-hole hammer drill bit. When the pipe pile driver is drilling, the auxiliary down-the-hole hammer drill bits are opened downward to adapt to the hole wall, ensuring efficient and stable drilling; after drilling is completed, they are directly recovered inward without the need for additional disassembly, which greatly improves work efficiency and convenience.

[0008] Preferably, a horizontal limit groove is provided at one end of the main impactor near the bottom of the inner retracting frame, and a limit rod is provided between the horizontal limit groove and the auxiliary impactor, one end of the limit rod is embedded in the horizontal limit groove, and the limit rod can slide in the horizontal limit groove along the length direction of the main impactor. The limit rod is used to limit the four auxiliary impactors of the inner retracting device, and when the limit rod is in a horizontal state, the auxiliary impactor is opened to the maximum limit relative to the main impactor and can operate.

[0009] Preferably, the four auxiliary down-the-hole hammer drill bits are arranged in parallel around the outer circumference of the main down-the-hole hammer drill bit with the main down-the-hole hammer drill bit as the center point, and the vertical height of the main down-the-hole hammer drill bit is higher than the height of the auxiliary down-the-hole hammer drill bits when extended, and the auxiliary impactor is arranged at a position close to the main down-the-hole hammer drill bit with a corner facing the main down-the-hole hammer drill bit.

[0010] Preferably, the drill rod assembly further includes a pipe pile, a drill rod and an air pressure pipe, wherein the pipe pile is sleeved outside the drill rod, the air pressure pipe is arranged at the inner center of the drill rod, and one end of the air pressure pipe close to the inner retracting frame is fixedly connected to the main impactor. The drill rod assembly realizes synchronous follow-up of the pipe pile by arranging the drill rod and the pipe pile, allowing the drill rod to sink the steel pipe (the pipe pile) into the soil layer as the drill rod descends while drilling a hole, realizing the one-time operation of following the pipe while drilling and drilling the pile foundation, and the drill rod is provided with spiral blades, which can realize taking out the soil at any time during drilling, thereby improving work efficiency.

[0011] Preferably, the drill rod is a smooth round drill rod with spiral blades.

[0012] Preferably, the pipe pile driver also includes a pressurizing mechanism, a pile clamping mechanism, a rotary power head and an air compressor. The pressurizing mechanism is fixedly arranged above the pipe pile, the pile clamping mechanism is fixedly arranged at the upper end of the working platform and clamps the periphery of the pipe pile, the rotary power head is arranged at one end of the drill rod close to the working platform, the air compressor is arranged inside the working platform and connected to the air compressor pipe, a pile hanging mechanism for hanging the pipe pile is arranged above the pile clamping mechanism, and a plurality of columns are arranged at the bottom of the working platform, and the columns are fixed to the ground by anchoring mechanisms.

[0013] Preferably, the anchoring mechanism includes a chassis and a plurality of anchoring bolts, the upper end of the chassis is provided with a detachable counterweight block, the column passes through the middle part of the counterweight block and is fixedly connected to the chassis, the anchoring bolts are fixed on the chassis at equal distances around the column, and the anchoring bolts sequentially pass through the counterweight block and the chassis and extend toward the ground.

[0014] Preferably, the pressurizing mechanism includes a gantry, a jack and a displacement measuring device, the jack abuts against one end of the pipe pile close to the working platform, and the other end of the jack abuts against the crossbeam of the gantry, the displacement measuring device is installed on the side of the gantry, and both sides of the gantry are fixedly connected to the working platform.

[0015] The displacement measuring device includes the installation of a total station type electronic tachometer, which means that once observed on the side station, necessary observation data such as slant distance, zenith distance (vertical angle), horizontal angle, etc. can be automatically displayed, and three-dimensional mapping and analysis can be performed, and the horizontal distance, height difference and point coordinates can be obtained almost at the same time. It is widely used in precision engineering measurement or deformation monitoring fields such as large-scale ground buildings and underground tunnel construction.

[0016] Preferably, the pile clamping mechanism comprises a plurality of pile clamping plates, a hydraulic rod and a controller, wherein the pile clamping plates are equidistantly arranged on the outer wall of the end of the pipe pile surrounding the pipe pile, the side of the pile clamping plates facing away from the pipe pile is fixedly connected to the hydraulic rod, and the hydraulic rod is electrically connected to the controller.

[0017] Preferably, the pile hanging mechanism comprises a winch and a steel wire rope, the winch is connected to the steel wire rope, and a pulley is arranged on the steel wire rope. The staff controls the winch to tighten and loosen the steel wire rope to achieve the hoisting of the pile clamping mechanism.

[0018] The present invention also provides a construction method of a pipe pile driver with a down-the-hole hammer drill bit for pipe pile while drilling, comprising the following steps:

[0019] Step 1: Clean the construction area and mark the construction boundary, identify and locate the drill holes, and determine the hole depth;

[0020] Step 2: Install the pile driver at a suitable location in the construction area, assemble the rotary power head, the pressure mechanism, the pile clamping mechanism, and the pile hanging mechanism in sequence, then anchor the working platform to the ground through the anchoring mechanism, install the drill rod, and debug the equipment;

[0021] Step 3: Apply downward pressure through the jack of the pressure mechanism to open the four auxiliary down-the-hole hammer drill bits, start the rotary power head and the air compressor to make the drill rod drill, and at the same time, the soil debris is brought out of the ground through the drill rod with spiral blades;

[0022] Step 4: When drilling to the final hole at the designed elevation, lift the down-the-hole hammer drill bit, and retract the four auxiliary down-the-hole hammer drill bits inward to complete the drilling.

[0023] The beneficial effects produced by the technical solution of the present invention are as follows:

[0024] (1) The drill bit device of the present invention adopts a main down-the-hole hammer drill bit and four auxiliary down-the-hole hammer drill bits. Under the action of the jack, the auxiliary down-the-hole hammer drill bits are opened downward to adapt to the hole wall when the pile driver is drilling, ensuring efficient and stable drilling; after drilling is completed, the auxiliary down-the-hole hammer drill bits are directly recovered inward without the need for additional disassembly, which greatly improves the working efficiency and convenience.

[0025] (2) The drill rod of the present invention adopts synchronous follow-up of pipe piles, allowing the drill rod to sink the steel pipe (pipe pile) into the soil layer as the drill rod descends while drilling a hole, thereby realizing the one-time operation of following the pipe while drilling and drilling the pile foundation. This one-time operation method greatly shortens the construction period and improves the overall construction efficiency. Compared with the traditional construction method, this technology does not need to wait for the hole wall to consolidate, thereby saving time, and does not require mud wall protection or rigid casing, and no mud skin will be formed on the hole wall of the drill hole. It is particularly suitable for sand layers, silt and other rock formations that are prone to hole collapse and need to be broken with very high hardness. It can greatly improve the side friction resistance and bearing capacity of the pile, and will not cause quality problems such as hole collapse, broken piles, mud inclusions, diameter expansion, and diameter reduction. There is no mud preparation and discharge, which protects the water quality of the environmental water body and effectively controls the cost.

[0026] (3) The pile driver of the present invention has a small operating radius and is simple and quick to assemble. It can be anchored to a fixed working surface by anchor bolts, and is particularly suitable for narrow sites and low clearance environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 It is a three-dimensional structural schematic diagram of the present invention;

[0029] Figure 2 It is a schematic diagram of the structure of the inner retraction device of the present invention being opened;

[0030] Figure 3 It is a schematic diagram of the structure of the inner-retracting device of the present invention when it is closed;

[0031] Figure 4 It is a structural schematic diagram of the drill rod member of the present invention;

[0032] Figure 5 It is a structural schematic diagram of the pressurizing mechanism of the present invention;

[0033] Figure 6 It is a structural schematic diagram of the pile clamping mechanism of the present invention;

[0034] Figure 7 It is a structural schematic diagram of the anchoring mechanism of the present invention;

[0035] Figure 8 It is a structural schematic diagram of the working platform of the present invention.

[0036] Among them, 1. working platform; 11. column; 2. drill rod; 21. main impactor; 22. main down-the-hole hammer drill bit; 23. horizontal limit groove; 24. limit rod; 25. pipe pile; 26. drill rod; 27. air compressor pipe; 3. retraction device; 31. retraction frame; 32. auxiliary down-the-hole hammer drill bit; 33. auxiliary impactor; 34. frame rod; 4. pressurizing mechanism; 41. gantry; 42. jack; 43. displacement measuring device; 5. pile clamping mechanism; 51. pile clamping piece; 52. hydraulic rod; 6. rotary power head; 7. air compressor; 8. pile hanging mechanism; 9. anchoring mechanism; 91. chassis; 92. anchoring bolt; 93. counterweight block. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the technical scheme in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. Therefore, the following detailed description of the embodiments provided by the present invention is not intended to limit the scope of the claimed invention, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] In the following description of the invention, it should be noted that the terms "upper", "lower", "left", "right", "inner", "outer", etc., indicating directions or positional relationships, are based on directions or positional relationships shown in the drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. The term "connection" only indicates the connection between devices and has no special meaning.

[0039] In addition, the technical fields and installation methods involved in the embodiments of the present invention described below can be combined with each other as long as there is no conflict between them.

[0040] This embodiment fully analyzes the problems in the prior art that the traditional pipe pile driver has a large operating radius, is complex to install, and is inconvenient to disassemble and recycle after the traditional drill bit completes the task. The present invention provides a pipe pile driver with a down-the-hole hammer drill bit for pipe pile while drilling and a construction method thereof. The specific embodiments are as follows:

[0041] like Figures 1 to 5 As shown, a pipe pile driver with a down-the-hole hammer drill bit for pipe pile while drilling comprises a working platform 1, a drill rod 2 is arranged through the middle of the working platform 1, a main impactor 21 is arranged at the end of the drill rod 2 away from the working platform 1, a main down-the-hole hammer drill bit 22 is arranged at the free end of the main impactor 21, and a retraction device 3 is sleeved on the drill rod 2 near the main down-the-hole hammer drill bit 22; the retraction device 3 comprises a retraction frame 31 and four auxiliary down-the-hole hammer drill bits 32 arranged around the main down-the-hole hammer drill bit 22, the auxiliary down-the-hole hammer drill bits 32 are connected to the bottom of the retraction frame 31 through four auxiliary impactors 33, the retraction frame 31 is movably connected to the drill rod 2, and four frame rods 34 for retracting the four auxiliary impactors 33 with limited positions are arranged on the retraction frame 31, one end of the frame rod 34 is movably connected to the retraction frame 31 through a first bolt, and the other end of the frame rod 34 is movably connected to the auxiliary impactor 33 through a second bolt.

[0042] By setting up the retraction device 3, the retraction device 3 includes an retraction frame 31 and four auxiliary down-the-hole hammer drill bits 32 arranged around the main down-the-hole hammer drill bit 22. When the pipe pile driver is drilling, the auxiliary down-the-hole hammer drill bits 32 are opened downward to adapt to the hole wall, ensuring efficient and stable drilling; after drilling is completed, they are directly recovered inward without the need for additional disassembly, which greatly improves the operating efficiency and convenience.

[0043] As a preferred embodiment, a horizontal limit groove 23 is provided at one end of the main impactor 21 near the bottom of the inner retracting frame 31, and a limit rod 24 is provided between the horizontal limit groove 23 and the auxiliary impactor 33. One end of the limit rod 24 is embedded in the horizontal limit groove 23 and the limit rod 24 can slide in the horizontal limit groove 23 along the length direction of the main impactor 21. The limit rod 24 is used to limit the four auxiliary impactors 33 of the inner retracting device 3. When the limit rod 24 is in a horizontal state, the auxiliary impactor 33 is opened to the maximum limit relative to the main impactor 21 and can operate.

[0044] As a preferred embodiment, four auxiliary down-the-hole hammer drill bits 32 are arranged in parallel around the outer circumference of the main down-the-hole hammer drill bit 22 with the main down-the-hole hammer drill bit 22 as the center point, and the vertical height of the main down-the-hole hammer drill bit 22 is higher than the outward height of the auxiliary down-the-hole hammer drill bits 32, and the auxiliary impactor 33 is provided with a corner facing the main down-the-hole hammer drill bit 22 near the main down-the-hole hammer drill bit 22.

[0045] As a preferred embodiment, the drill rod 2 also includes a pipe pile 25, a drill rod 26 and an air compressor pipe 27. The pipe pile 25 is sleeved on the outside of the drill rod 26, and the air compressor pipe 27 is arranged at the inner center of the drill rod 26. One end of the air compressor pipe 27 close to the inner retracting frame 31 is fixedly connected to the main impactor 21. The drill rod 2 realizes synchronous follow-up of the pipe pile by arranging the drill rod 26 and the pipe pile 25, allowing the drill rod 26 to sink the steel pipe (pipe pile 25) into the soil layer as the drill rod 26 descends while drilling a hole, realizing the one-time operation of following the pipe while drilling and drilling the pile foundation, and the drill rod 26 is provided with spiral blades, so that the soil can be taken out at any time during drilling, thereby improving work efficiency.

[0046] As a preferred embodiment, the drill rod 26 is a smooth round drill rod with spiral blades.

[0047] As a preferred embodiment, the pipe pile driver also includes a pressurizing mechanism 4, a pile clamping mechanism 5, a rotary power head 6 and an air compressor 7. The pressurizing mechanism 4 is fixedly arranged above the pipe pile 25. The pile clamping mechanism (5) is fixedly arranged at the upper end of the working platform 1 and clamps the outer periphery of the pipe pile 25. The rotary power head 6 is arranged at one end of the drill rod 26 close to the working platform 1. The air compressor 7 is arranged inside the working platform 1 and connected to the air compressor pipe 27. A pile hanging mechanism 8 for hanging the pipe pile 25 is arranged above the pile clamping mechanism 5. A plurality of columns 11 are arranged at the bottom of the working platform 1, and the columns 11 are fixed to the ground by anchoring mechanisms 9.

[0048] As a preferred embodiment, the anchoring mechanism 9 includes a chassis 91 and a plurality of anchoring bolts 92. A removable counterweight block 93 is provided at the upper end of the chassis 91. The column 11 passes through the middle of the counterweight block 93 and is fixedly connected to the chassis 91. The anchoring bolts 92 are fixed on the chassis 91 at equal distances around the column 11. The anchoring bolts 92 pass through the counterweight block 93 and the chassis 91 in turn and extend toward the ground.

[0049] As a preferred embodiment, the pressurizing mechanism 4 includes a gantry 41, a jack 42 and a displacement measuring device 43. The jack 42 abuts against one end of the pipe pile 25 close to the working platform 1, and the other end of the jack 42 abuts against the crossbeam of the gantry 41. The displacement measuring device 43 is installed on the side of the gantry 41, and both sides of the gantry 41 are fixedly connected to the working platform 1.

[0050] The displacement measuring device includes the installation of a total station type electronic tachometer, which means that once observed on the side station, necessary observation data such as slant distance, zenith distance (vertical angle), horizontal angle, etc. can be automatically displayed, and three-dimensional mapping and analysis can be performed, and the horizontal distance, height difference and point coordinates can be obtained almost at the same time. It is widely used in precision engineering measurement or deformation monitoring fields such as large-scale ground buildings and underground tunnel construction.

[0051] As a preferred embodiment, the pile clamping mechanism 5 includes a plurality of pile clamping pieces 51, a hydraulic rod 52 and a controller. The pile clamping pieces 51 are arranged on the outer wall of the end of the pipe pile 25 at equal distances around the pipe pile 25. The side of the pile clamping piece 51 facing away from the pipe pile 25 is fixedly connected to the hydraulic rod 52, and the hydraulic rod 52 is electrically connected to the controller. The controller controls the hydraulic rod 52 to apply pressure to the pipe pile 25, so that the pile clamping piece 51 clamps the pipe pile 25 to achieve pile clamping.

[0052] Preferably, the pile hanging mechanism 8 comprises a winch and a steel wire rope, wherein the winch is connected to the steel wire rope, and a pulley is arranged on the steel wire rope. The staff controls the winch to tighten and loosen the steel wire rope to achieve the hoisting of the pile clamping mechanism.

[0053] The present invention also provides a construction method of a pipe pile driver with a down-the-hole hammer drill bit for pipe pile while drilling, comprising the following steps:

[0054] Step 1: Clean the construction area and mark the construction boundary, identify and locate the drill holes, and determine the hole depth;

[0055] Step 2: Install the pile driver at a suitable location in the construction area, assemble the rotary power head 6, the pressurizing mechanism 4, the pile clamping mechanism 5, and the pile hanging mechanism 8 in sequence, then anchor the working platform 1 to the ground through the anchoring mechanism 9, install the drill rod 2, and debug the equipment;

[0056] Step 3: Apply downward pressure through the jack 42 of the pressure mechanism 4 to open the four auxiliary DTH hammer bits 32, start the rotary power head 6 and the air compressor 7 to make the drill rod 26 drill, and at the same time, the soil residue is brought out of the ground through the drill rod 26 with spiral blades;

[0057] Step 4: When the final hole at the designed elevation is drilled, the down-the-hole hammer drill bit is lifted, and the four auxiliary down-the-hole hammer drill bits 32 are retracted inward to complete the drilling.

[0058] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A pipe pile driver with a down-the-hole hammer drill bit for pipe pile drilling, characterized in that: The invention comprises a working platform (1), a drill rod (2) is arranged through the middle of the working platform (1), a main impactor (21) is arranged at one end of the drill rod (2) away from the working platform (1), a main down-the-hole hammer drill bit (22) is arranged at the free end of the main impactor (21), and an inner retraction device (3) is sleeved on the drill rod (2) near the main down-the-hole hammer drill bit (22); The retraction device (3) comprises a retraction frame (31) and four auxiliary down-the-hole hammer drill bits (32) arranged around the main down-the-hole hammer drill bit (22); the auxiliary down-the-hole hammer drill bits (32) are connected to the bottom of the retraction frame (31) through four auxiliary impactors (33); the retraction frame (31) is movably connected to the drill rod member (2); four frame rods (34) are provided on the retraction frame (31) for limiting the inward retraction of the four auxiliary impactors (33); one end of each frame rod (34) is movably connected to the retraction frame (31) through a first bolt, and the other end of each frame rod (34) is movably connected to the auxiliary impactor (33) through a second bolt.

2. A pipe pile driver with a down-the-hole hammer drill bit for pipe pile drilling according to claim 1, characterized in that: A horizontal limit groove (23) is provided at one end of the main impactor (21) close to the bottom of the inner frame (31), and a limit rod (24) is arranged between the horizontal limit groove (23) and the auxiliary impactor (33). One end of the limit rod (24) is embedded in the horizontal limit groove (23), and the limit rod (24) can slide in the horizontal limit groove (23) along the length direction of the main impactor (21).

3. A pipe pile driver with a down-the-hole hammer drill bit for pipe pile drilling according to claim 1, characterized in that: The four auxiliary down-the-hole hammer drill bits (32) are arranged in parallel around the outer circumference of the main down-the-hole hammer drill bit (22) with the main down-the-hole hammer drill bit (22) as the center point, and the vertical height of the main down-the-hole hammer drill bit (22) is higher than the outward extension height of the auxiliary down-the-hole hammer drill bits (32), and the auxiliary impactor (33) is provided with a corner facing the main down-the-hole hammer drill bit (22) at a position close to the main down-the-hole hammer drill bit (22).

4. A pile driver with a down-the-hole hammer drill bit for pile drilling according to claim 1, characterized in that: The drill rod member (2) further comprises a pipe pile (25), a drill rod (26) and an air pressure pipe (27); the pipe pile (25) is sleeved on the outside of the drill rod (26); the air pressure pipe (27) is arranged at the inner center position of the drill rod (26); and one end of the air pressure pipe (27) close to the inner retracting frame (31) is fixedly connected to the main impactor (21).

5. A pipe pile driver with a down-the-hole hammer drill bit for pipe pile drilling according to claim 4, characterized in that: The drill rod (26) is a smooth round drill rod with spiral blades.

6. A pipe pile driver with a down-the-hole hammer drill bit for pipe pile drilling according to claim 4, characterized in that: The pipe pile driver also includes a pressurizing mechanism (4), a pile clamping mechanism (5), a rotary power head (6) and an air compressor (7). The pressurizing mechanism (4) is fixedly arranged above the pipe pile (25). The pile clamping mechanism (5) is fixedly arranged at the upper end of the working platform (1) and clamps the periphery of the pipe pile (25). The rotary power head (6) is arranged at one end of the drill rod (26) close to the working platform (1). The air compressor (7) is arranged inside the working platform (1) and connected to the air compressor pipe (27). A pile hanging mechanism (8) for hanging the pipe pile (25) is arranged above the pile clamping mechanism (5). A plurality of columns (11) are arranged at the bottom of the working platform (1). The columns (11) are fixed to the ground through anchoring mechanisms (9).

7. A pipe pile driver with a down-the-hole hammer drill bit for pipe pile drilling according to claim 6, characterized in that: The anchoring mechanism (9) comprises a chassis (91) and a plurality of anchoring bolts (92); a detachable counterweight block (93) is provided at the upper end of the chassis (91); the column (11) passes through the middle of the counterweight block (93) and is fixedly connected to the chassis (91); the anchoring bolts (92) are fixed to the chassis (91) at equal intervals around the column (11); and the anchoring bolts (92) pass through the counterweight block (93) and the chassis (91) in sequence and extend toward the ground.

8. A pipe pile driver with a down-the-hole hammer drill bit for pipe pile drilling according to claim 6, characterized in that: The pressurizing mechanism (4) comprises a gantry (41), a jack (42) and a displacement measuring device (43); the jack (42) abuts against one end of the pipe pile (25) close to the working platform (1), and the other end of the jack (42) abuts against a crossbeam of the gantry (41); the displacement measuring device (43) is installed on the side of the gantry (41); and both sides of the gantry (41) are fixedly connected to the working platform (1).

9. A pipe pile driver with a down-the-hole hammer drill bit for pipe pile drilling according to claim 6, characterized in that: The pile clamping mechanism (5) comprises a plurality of pile clamping pieces (51), a hydraulic rod (52) and a controller. The pile clamping pieces (51) surround the pipe pile (25) and are arranged equidistantly on the outer wall of the end of the pipe pile (25). The side of the pile clamping piece (51) facing away from the pipe pile (25) is fixedly connected to the hydraulic rod (52), and the hydraulic rod (52) is electrically connected to the controller.

10. A construction method for a pipe pile driver with a down-the-hole hammer drill bit for pipe pile drilling, characterized in that: The following steps are involved: Step 1: Clean the construction area and mark the construction boundary, identify and locate the drill holes, and determine the hole depth; Step 2: Install the pile driver at an appropriate location in the construction area, assemble the rotary power head (6), the pressure mechanism (4), the pile clamping mechanism (5), and the pile hanging mechanism (8) in sequence, then anchor the working platform (1) on the ground through the anchoring mechanism (9), install the drill rod (2), and debug the equipment; Step 3: applying downward pressure through the jack (42) of the pressure mechanism (4) to open the four auxiliary down-the-hole hammer drill bits (32), starting the rotary power head (6) and the air compressor (7) to make the drill rod (26) drill, and at the same time, the soil debris is brought out of the ground through the drill rod (26) with spiral blades; Step 4: When the final hole of the designed elevation is drilled, the down-the-hole hammer drill bit is lifted, and the four auxiliary down-the-hole hammer drill bits (32) are retracted inwards to complete the drilling.

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