Down-hole grouting construction device and down-hole cast-in-place pile construction method based on down-hole grouting construction device

Abstract

The invention discloses a down-hole grouting construction device and a down-hole cast-in-place pile construction method based on the device. The down-hole grouting construction device comprises a pile machine body and a mast on the pile machine body, a driving mechanism is installed on the mast, the bottom of the driving mechanism is connected with a spiral deslagging structure, a lifting grouting structure and a sleeve structure, and the spiral deslagging structure is arranged in the sleeve structure; the end, opposite to the driving mechanism, of the spiral deslagging structure is connected with a down-the-hole hammer structure, the impact end of the down-the-hole hammer structure extends out of the bottom of the sleeve structure, the lifting grouting structure is arranged on the peripheral side of the sleeve structure, and an expansion rotary excavating structure is further arranged at the bottom of the sleeve structure. The spiral deslagging structure, the down-the-hole hammer structure, the lifting grouting structure and the sleeve structure form the multifunctional down-the-hole grouting construction device integrating down-the-hole, reaming, deslagging and grouting. According to the method, the inner wall of the pile hole can be effectively prevented from being touched by repeated drilling and drill lifting, down-hole, reaming, deslagging and grouting integrated construction is achieved, operation is convenient, the construction efficiency is effectively improved, and the construction steps are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of cast-in-place pile construction, and particularly to a down-the-hole grouting construction device and a down-the-hole cast-in-place pile construction method based on the device. Background Art

[0002] Currently, in the field of construction, the down-the-hole cast-in-place pile construction method is a widely used technology. Traditional construction methods include multiple steps such as using a down-the-hole hammer to drill holes, discharging slag with a long spiral rod, and grouting with a grouting machine. However, during this process, the operation of drilling down and pulling out the drill needs to be repeated in the hole. During this period, the device is prone to touching the inner wall of the already completed pile hole, resulting in damage to the hole wall structure or falling of the muck in the hole, and even collapse of the pile hole, thus affecting the subsequent concrete pouring effect. To solve this problem, the current pneumatic down-the-hole hammer adds a casing protection measure during down-the-hole drilling to prevent the hole wall from collapsing.

[0003] Although this casing protection method is effective, it also brings some new problems. The addition of the casing will reduce the diameter of the pile hole, which undoubtedly increases the difficulty of removing the equipment and muck, especially when operating in a narrow space. At the same time, this approach also increases the complexity and cost of the device, restricting the flexibility and efficiency of the construction process.

[0004] Therefore, it is necessary to provide a down-the-hole grouting construction device and a down-the-hole cast-in-place pile construction method based on the device that are easy to operate, can effectively avoid repeated drilling down and pulling out the drill from touching the inner wall of the pile hole, and are convenient for discharging slag and grouting. Summary of the Invention

[0005] The present invention provides a down-the-hole grouting construction device and a down-the-hole cast-in-place pile construction method based on the device to solve the problems raised in the above background art.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] A down-the-hole grouting construction device includes a pile driver main body and a mast on the pile driver main body. A driving mechanism is installed on the mast. The bottom of the driving mechanism is connected with a spiral slag discharging structure, a lifting grouting structure, and a sleeve structure. Among them, the spiral slag discharging structure is arranged inside the sleeve structure. One end of the spiral slag discharging structure opposite to the driving mechanism is connected with a down-the-hole hammer structure, and the impact end of the down-the-hole hammer structure extends out of the bottom of the sleeve structure. The lifting grouting structure is arranged on the outer peripheral side of the sleeve structure. An expanding rotary drilling structure is also provided at the bottom of the sleeve structure. The spiral slag discharging structure, the down-the-hole hammer structure, the lifting grouting structure, and the sleeve structure form a multi-functional down-the-hole grouting construction device integrating down-the-hole drilling, hole expansion, slag discharging, and grouting. The pile driver main body and the mast are both existing structural devices of construction devices in this field and will not be described in detail here.

[0008] The sleeve structure includes a casing, a connection disk is provided at the top of the casing, the connection disk is fixedly connected to the driving mechanism, the expansion rotary drilling structure includes a plurality of mounting slots annularly arranged on the outer peripheral side of the lower part of the casing, arc-shaped shaft grooves are symmetrically arranged at the top and bottom inside the mounting slots, the cross-section of the arc-shaped shaft groove is a 3 / 4 circle structure, and a semi-circular shaft block is movably installed in each arc-shaped shaft groove, and a first cutter head is fixed in the middle of the semi-circular shaft block. By setting the arc-shaped shaft groove with a 3 / 4 circle structure, the rotation angle of the semi-circular shaft block in the clockwise and counterclockwise directions is limited to 90°, thereby limiting the angular position of the first cutter head extending out of the mounting slot;

[0009] When the rotation direction of the rotary motor is the same as the orientation of the first cutter head, that is, when performing down-the-hole work, the first cutter head will extend out of the mounting slot for expansion rotary drilling;

[0010] When the rotation direction of the rotary motor is opposite to the orientation of the first cutter head, that is, when performing grouting work, the first cutter head will retract into the mounting slot to prevent damage to the inner wall of the hole that has completed down-the-hole work.

[0011] A central shaft slot is provided at the center of the arc-shaped shaft groove, a rotating shaft is provided at the center of the semi-circular shaft block, the rotating shaft is movably installed corresponding to the central shaft slot, and a plurality of second cutter heads are annularly arranged on the bottom surface of the casing. The rotating shaft rotates in the central shaft slot to assist the rotation of the semi-circular shaft block in the arc-shaped shaft groove and prevent the semi-circular shaft block from getting stuck in the arc-shaped shaft groove.

[0012] The driving mechanism includes a rotary motor, a fixed disk is fixedly connected to the lower part of the output shaft of the rotary motor, two connecting rods are symmetrically fixed at the bottom of the fixed disk and the connecting rods penetrate through the connection disk, and the connecting rods are welded to the connection disk.

[0013] A fixing ring is sleeved on the lower part of the connecting rod, a threaded block is provided on the outer peripheral side of the casing corresponding to the fixing ring, and a screw rod is further included. The screw rod sequentially penetrates through the fixing ring and the connecting rod and is threadedly connected to the threaded block, and the fixed disk is installed and connected to the mast. Through the welding between the connecting rod and the connection disk and the connection of the screw rod, fixing ring, connecting rod and threaded block, the casing is fixed, the stability of the casing during down-the-hole work is improved, the verticality of the casing is maintained, and the deviation of the hole angle caused by the angle deviation of the casing is prevented.

[0014] The spiral slag discharging structure includes a central shaft rod fixed in the middle of the bottom surface of the fixed disk, spiral blades are wound around the outer peripheral side of the central shaft rod, an air flow channel is arranged inside the central shaft rod, the lower end of the air flow channel is communicated with the down-the-hole hammer structure, an air delivery pipe is arranged on the side surface of the top of the central shaft rod, one end of the air delivery pipe is communicated with the top of the air flow channel, and the other end of the air delivery pipe is connected to an air compressor. Through the rotation of the spiral blades and the discharge of the high-pressure waste gas of the down-the-hole hammer structure, the soil slag is discharged out of the hole. The air compressor is an existing device and is not uniquely defined here.

[0015] The down-the-hole hammer structure includes a hammer body. The top of the hammer body is fixedly connected to the lower end of the central shaft rod. The upper part inside the hammer body is an impactor, and the lower part of the hammer body is a hammer head. The hammer body is an existing pneumatic down-the-hole hammer, and both the impactor and the hammer head therein are existing mature technologies, which will not be elaborated here. Rotary blades can be provided on the outer peripheral side of the hammer body to assist in slag discharge.

[0016] The lower end of the air flow channel communicates with the impactor. A main flow pipe is provided inside the hammer head. The upper end of the main flow pipe communicates with the impactor. A plurality of exhaust ports are provided at the bottom of the hammer head, and each of the exhaust ports communicates with the lower end of the main flow pipe respectively.

[0017] The lifting and grouting structure includes that electric telescopic rods are fixedly installed at the lower ends of the respective connecting rods. The telescopic ends of the two electric telescopic rods are arranged downward, and a lifting plate is fixed to the telescopic ends of the two electric telescopic rods. A plurality of grouting pipes are installed on the lifting plate, and the ends of the respective grouting pipes opposite to the lifting plate are respectively connected to a grouting machine.

[0018] A construction method for cast-in-place pile by down-the-hole grouting based on the down-the-hole grouting construction device as described above includes the following steps:

[0019] 1) Move the pile driver main body to the construction position where down-the-hole operation is required, and start the pile driver main body to make the spiral slag discharge structure, down-the-hole hammer structure, lifting and grouting structure and sleeve structure move vertically downward along the mast as a whole;

[0020] 2) Start the air compressor and the rotary motor. The rotary motor drives the spiral slag discharge structure, down-the-hole hammer structure and sleeve structure to rotate. The air compressor conveys high-pressure gas to the impactor through the air flow channel, so that the impact work and impact frequency generated by the operation of the impactor can be directly transmitted to the hammer head, and cooperate with the rotary drive of the rotary motor to form a pulsating crushing ability for the rock;

[0021] 3) At the same time, the high-pressure exhaust gas generated by the impactor is dispersed and flows through the main flow pipe to be discharged from each exhaust port, thereby blowing away the crushed rock particles, and at the same time blowing and cooling the impact part of the hammer head;

[0022] 4) Through the rotation of the rotary motor, drive the casing to rotate, and then carry out rotary excavation on the plot through the second cutter head at the bottom of the casing. At the same time, the rotation direction of the casing is the same as the orientation of the first cutter head. The first cutter head rotates along with the semi-circular shaft block in the arc-shaped shaft groove. Since the cross-section of the arc-shaped shaft groove is a 3 / 4 circular structure, the maximum rotation angle of the semi-circular shaft block in the arc-shaped shaft groove is 90°, so that the first cutter head pops out of the installation slot to expand and rotary excavate the side wall in the hole;

[0023] 5) Meanwhile, the central shaft drives the spiral blade to rotate, conveying the soil residues generated by the hammer head, the first cutter head, and the second cutter head construction upward along the inside of the casing, and discharging them out of the hole through the vacant part between the fixed disk and the connecting disk;

[0024] 6) After the sub-drilling is completed, start the electric telescopic rod, and the lifting plate moves downward along the outer periphery of the casing. When the lifting plate moves to the bottom of the casing, start the grouting machine, and pour concrete into the bottom of the hole through the grouting pipe. While the grouting machine is working, the main body of the pile driver drives the spiral slag discharge structure, the sub-drilling hammer structure, the lifting and grouting structure, and the sleeve structure to move upward and reset as a whole until completely leaving the sub-drilling to stop grouting, and the construction is completed.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] In the sub-drilling and grouting construction device of the present invention, the driving device is connected to the spiral slag discharge structure, the sub-drilling hammer structure, and the sleeve structure. The hardest rock layer is broken by the sub-drilling hammer structure at the lowermost end, and the second cutter head of the casing is used to perform rotary sub-drilling on the soil layer. At the same time, the high-pressure waste gas generated by the operation of the sub-drilling hammer structure is dispersed and flows through the main flow pipe to each exhaust port for discharge, and the spiral blade rotates to discharge the soil residues upward along the inside of the casing and out of the hole.

[0027] A first cutter head is arranged on the outer periphery of the lower part of the casing. During sub-drilling construction, the first cutter head extends out of the installation slot and expands and rotates the outside of the casing in cooperation with the rotation of the rotary motor to increase the sub-drilling diameter. During grouting construction, the first cutter head automatically retracts into the installation slot, which can prevent damage to the inner wall of the completed sub-drilled hole. An arc-shaped shaft groove with a 3 / 4 circle structure is provided, so that the rotation angle of the semi-circular shaft block in the clockwise and counterclockwise directions is limited to 90°, thereby limiting the angular position of the first cutter head extending out of the installation slot.

[0028] In the sub-drilled cast-in-place pile construction method of the present invention, by setting the driving device, the spiral slag discharge structure, the lifting and grouting structure, the sub-drilling hammer structure, and the sleeve structure, only a single drill-in is required during construction to achieve integrated construction of sub-drilling, hole expansion, slag discharge, and grouting, effectively avoiding the operation of repeated drill-in and drill-out during sub-drilling construction from damaging the pile hole structure, improving the construction efficiency, and reducing the construction steps. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is the overall structural schematic diagram of the present invention;

[0030] Figure 2 is the structural schematic diagram of the driving device, the spiral slag discharge structure, the lifting and grouting structure, the sub-drilling hammer structure, and the sleeve structure of the present invention;

[0031] Figure 3 is the cross-sectional structural schematic diagram of the expansion and rotary excavation structure of the present invention;

[0032] Figure 4 Schematic diagram of the first cutter head extending and retracting states of the present invention;

[0033] Figure 5 Schematic diagram of the rotation range of the semi-circular shaft block of the present invention in the arc-shaped shaft groove;

[0034] Figure 6 Schematic diagram of the hammer main body structure of the present invention;

[0035] 1. Pile driver main body; 11. Mast; 2. Driving mechanism; 21. Rotating motor; 22. Fixed disk; 23. Connecting rod; 24. Fixed ring; 25. Threaded block; 26. Screw; 3. Spiral slag discharge structure; 31. Central shaft rod; 32. Spiral blade; 33. Air flow channel; 34. Air delivery pipe; 35. Air compressor; 4. Lifting grouting structure; 41. Electric telescopic rod; 42. Lifting plate; 43. Grouting pipe; 44. Grouting machine; 5. Sleeve structure; 51. Sleeve; 52. Connecting disk; 6. Down-the-hole hammer structure; 61. Hammer main body; 62. Impactor; 63. Hammer head; 64. Main flow pipe; 65. Exhaust port; 7. Expanding rotary drilling structure; 71. Installation slot; 72. Arc-shaped shaft groove; 73. Semi-circular shaft block; 74. First cutter head; 75. Central shaft slot; 76. Rotating shaft; 77. Second cutter head. Specific embodiments

[0036] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.

[0037] Referring to Figure 1-6 , a down-the-hole grouting construction device includes a pile driver main body 1 and a mast 11 on the pile driver main body 1. A driving mechanism 2 is installed on the mast 11. The bottom of the driving mechanism 2 is connected to a spiral slag discharge structure 3, a lifting grouting structure 4, and a sleeve structure 5. Among them, the spiral slag discharge structure 3 is arranged inside the sleeve structure 5. One end of the spiral slag discharge structure 3 opposite to the driving mechanism 2 is connected to a down-the-hole hammer structure 6, and the impact end of the down-the-hole hammer structure 6 extends out of the bottom of the sleeve structure 5. The lifting grouting structure 4 is arranged on the outer peripheral side of the sleeve structure 5. An expanding rotary drilling structure 7 is also provided at the bottom of the sleeve structure 5. The spiral slag discharge structure 3, the down-the-hole hammer structure 6, the lifting grouting structure 4, and the sleeve structure 5 form a multi-functional down-the-hole grouting construction device integrating down-the-hole, hole expansion, slag discharge, and grouting. The pile driver main body 1 and the mast 11 are both existing structural devices of the construction device in this field and will not be described in detail here.

[0038] Preferably, the sleeve structure 5 includes a casing 51, a connection disk 52 is provided at the top of the casing 51, the connection disk 52 is fixedly connected to the driving mechanism 2, the expanding rotary drilling structure 7 includes a plurality of installation slots 71 annularly arranged on the outer peripheral side of the lower part of the casing 51, arc-shaped shaft slots 72 are symmetrically arranged at the top and bottom inside the installation slots 71, the cross-section of the arc-shaped shaft slots 72 is a 3 / 4 circle structure, a semi-circular shaft block 73 is movably installed in each of the arc-shaped shaft slots 72, and a first cutter head 74 is fixed in the middle of the semi-circular shaft block 73. By providing the arc-shaped shaft slots 72 with a 3 / 4 circle structure, the rotation angle of the semi-circular shaft block 73 in the clockwise and counterclockwise directions is limited to 90°, thereby limiting the angular position of the first cutter head 74 extending out of the installation slot 71;

[0039] Preferably, when the rotation direction of the rotary motor 21 is the same as the orientation of the first cutter head 74, that is, when performing down-the-hole work, the first cutter head 74 will extend out of the installation slot 71 for expanding rotary drilling;

[0040] Preferably, when the rotation direction of the rotary motor 21 is opposite to the orientation of the first cutter head 74, that is, when performing grouting work, the first cutter head 74 will retract into the installation slot 71 to prevent damage to the inner wall of the down-the-hole that has been completed.

[0041] Preferably, a central shaft slot 75 is provided at the center of the arc-shaped shaft slot 72, a rotating shaft 76 is provided at the center of the semi-circular shaft block 73, the rotating shaft 76 is movably installed corresponding to the central shaft slot 75, and a plurality of second cutter heads 77 are annularly arranged on the bottom surface of the casing 51. The rotating shaft 76 rotates in the central shaft slot 75 to assist the rotation of the semi-circular shaft block 73 in the arc-shaped shaft slot 72 and prevent the semi-circular shaft block 73 from getting stuck in the arc-shaped shaft slot 72.

[0042] Preferably, the driving mechanism 2 includes a rotary motor 21, a fixed disk 22 is fixedly connected to the lower part of the output shaft of the rotary motor 21, two connecting rods 23 are symmetrically fixed at the bottom of the fixed disk 22 and the connecting rods 23 penetrate through the connection disk 52, and the connecting rods 23 are welded to the connection disk 52.

[0043] Preferably, a fixing ring 24 is sleeved on the lower part of the connecting rod 23, a threaded block 25 is provided on the outer peripheral side of the casing 51 corresponding to the fixing ring 24, and a screw rod 26 is further included. The screw rod 26 sequentially penetrates through the fixing ring 24 and the connecting rod 23 and is threadedly connected to the threaded block 25, and the fixed disk 22 is installed and connected to the mast 11. Through the welding between the connecting rod 23 and the connection disk 52 and the connection of the screw rod 26, the fixing ring 24, the connecting rod 23, and the threaded block 25, the casing 51 is fixed, the stability of the casing 51 during down-the-hole is improved, the verticality of the casing 51 is maintained, and the deviation of the hole angle caused by the angular deviation of the casing 51 is prevented.

[0044] Preferably, the spiral slag discharging structure 3 includes a central shaft rod 31 fixed to the middle of the bottom surface of the fixed disk 22. A spiral blade 32 is wound around the outer peripheral side of the central shaft rod 31. An air flow channel 33 is provided inside the central shaft rod 31. The lower end of the air flow channel 33 is communicated with the down-the-hole hammer structure 6. An air delivery pipe 34 is provided on the side surface of the top of the central shaft rod 31. One end of the air delivery pipe 34 is communicated with the top of the air flow channel 33, and the other end of the air delivery pipe 34 is connected to an air compressor 35. Through the rotation of the spiral blade 32 and the discharge of high-pressure waste gas by the down-the-hole hammer structure 6, the soil slag is discharged out of the hole. The air compressor 35 is an existing device and is not uniquely defined here.

[0045] Preferably, the down-the-hole hammer structure 6 includes a hammer main body 61. The top of the hammer main body 61 is fixedly connected to the lower end of the central shaft rod 31. The upper part inside the hammer main body 61 is an impactor 62, and the lower part of the hammer main body 61 is a hammer head 63. The hammer main body 61 is an existing pneumatic down-the-hole hammer, and the impactor 62 and the hammer head 63 therein are both existing mature technologies and will not be elaborated here. Rotary blades can be provided on the outer peripheral side of the hammer main body 61 to assist in slag discharging.

[0046] Preferably, the lower end of the air flow channel 33 is communicated with the impactor 62. A main flow pipe 64 is provided inside the hammer head 63. The upper end of the main flow pipe 64 is communicated with the impactor 62. A plurality of exhaust ports 65 are provided at the bottom of the hammer head 63, and each of the exhaust ports 65 is respectively communicated with the lower end of the main flow pipe 64.

[0047] Preferably, the lifting and grouting structure 4 includes that electric telescopic rods 41 are respectively fixedly installed at the lower ends of the connecting rods 23. The telescopic ends of the two electric telescopic rods 41 are arranged downward, and a lifting plate 42 is fixed to the telescopic ends of the two electric telescopic rods 41. A plurality of grouting pipes 43 are installed on the lifting plate 42. One end of each of the grouting pipes 43 opposite to the lifting plate 42 is respectively connected to a grouting machine 44.

[0048] A construction method for a cast-in-place pile with a down-the-hole based on the above-mentioned down-the-hole grouting construction device includes the following steps:

[0049] 1) Move the pile driver main body 1 to the construction position where down-the-hole is required, and start the pile driver main body 1 to make the spiral slag discharging structure 3, the down-the-hole hammer structure 6, the lifting and grouting structure 4 and the sleeve structure 5 move vertically downward along the mast 11 as a whole;

[0050] 2) Start the air compressor 35 and the rotary motor 21. The rotary motor 21 drives the spiral slag discharging structure 3, the down-the-hole hammer structure 6 and the sleeve structure 5 to rotate. The air compressor 35 conveys high-pressure gas to the impactor 62 through the air flow channel 33, so that the impact work and impact frequency generated by the operation of the impactor 62 can be directly transmitted to the hammer head 63, and cooperate with the rotational drive of the rotary motor 21 to form a pulsating crushing ability for the rock;

[0051] 3) Meanwhile, the high-pressure waste gas generated by the impactor 62 is dispersed and flows through the main flow pipe 64 to each exhaust port 65 for discharge, thereby blowing away the crushed rock particles and simultaneously blowing air to cool the impact part of the hammer head 63;

[0052] 4) Through the rotation of the rotary motor 21, the sleeve 51 is driven to rotate, and then the second cutter head 77 at the bottom of the sleeve 51 is used to perform rotary excavation on the plot. At the same time, the rotation direction of the sleeve 51 is the same as the orientation of the first cutter head 74. The first cutter head 74 rotates along with the semi-circular shaft block 73 in the arc-shaped shaft groove 72. Since the cross-section of the arc-shaped shaft groove 72 is a 3 / 4 circle structure, the maximum rotation angle of the semi-circular shaft block 73 in the arc-shaped shaft groove 72 is 90°, and then the first cutter head 74 pops out of the installation slot 71 to expand and excavate the side wall of the hole;

[0053] 5) At the same time, the central shaft rod 31 drives the spiral blade 32 to rotate, conveys the soil residues generated by the construction of the hammer head 63, the first cutter head 74 and the second cutter head 77 upward along the inside of the sleeve 51, and discharges them out of the hole through the vacant part between the fixed disk 22 and the connecting disk 52;

[0054] 6) After the down-the-hole drilling is completed, the electric telescopic rod 41 is started, and the lifting plate 42 moves downward along the outer peripheral side of the sleeve 51. When the lifting plate 42 moves to the lowest part of the sleeve 51, the grouting machine 44 is started, and concrete is poured into the bottom of the hole through the grouting pipe 43. While the grouting machine 44 is working, the pile driver main body 1 drives the spiral slag discharge structure 3, the down-the-hole hammer structure 6, the lifting and grouting structure 4 and the sleeve structure 5 to move upward and reset integrally until completely leaving the down-the-hole drilling to stop grouting, and the construction is completed.

[0055] The present invention can effectively avoid repeated down-the-hole drilling and up-the-hole drilling from touching the inner wall of the pile hole, realize the integrated construction of down-the-hole drilling, hole expansion, slag discharge and grouting, is convenient to operate, effectively improves the construction efficiency and reduces the construction steps.

[0056] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, it is intended to include all changes falling within the meaning and scope of the equivalent elements of the claims in the present invention. Any reference signs in the claims should not be regarded as limiting the claimed claims.

[0057] In addition, it should be understood that although this specification is described in terms of embodiments, not every embodiment contains only one independent technical solution. This narrative manner of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A down-the-hole grouting construction device, comprising a pile driver main body (1) and a mast (11) on the pile driver main body (1), characterized in that, A driving mechanism (2) is installed on the mast (11). The bottom of the driving mechanism (2) is connected with a screw slag discharging structure (3), a lifting grouting structure (4) and a sleeve structure (5). Among them, the screw slag discharging structure (3) is arranged inside the sleeve structure (5). The end of the screw slag discharging structure (3) opposite to the driving mechanism (2) is connected with a down-the-hole hammer structure (6), and the impact end of the down-the-hole hammer structure (6) extends out of the bottom of the sleeve structure (5). The lifting grouting structure (4) is arranged on the outer peripheral side of the sleeve structure (5). An expansion rotary drilling structure (7) is also arranged at the bottom of the sleeve structure (5). The screw slag discharging structure (3), the down-the-hole hammer structure (6), the lifting grouting structure (4) and the sleeve structure (5) form a multifunctional down-the-hole grouting construction device integrating down-the-hole drilling, hole expansion, slag discharging and grouting.

2. The down-the-hole grouting construction device according to claim 1, characterized in that, The sleeve structure (5) includes a casing (51). A connecting plate (52) is arranged at the top of the casing (51). The connecting plate (52) is fixedly connected with the driving mechanism (2). The expansion rotary drilling structure (7) includes a plurality of mounting slots (71) annularly arranged on the outer peripheral side of the lower part of the casing (51). Arc-shaped shaft slots (72) are symmetrically arranged at the top and bottom inside the mounting slots (71). The cross-section of the arc-shaped shaft slots (72) is a 3 / 4 circle structure. A semi-circular shaft block (73) is movably installed in each of the arc-shaped shaft slots (72). A first cutter head (74) is fixed in the middle of the semi-circular shaft block (73).

3. The down-the-hole grouting construction device according to claim 1, characterized in that, A central shaft slot (75) is arranged at the center of the arc-shaped shaft slot (72). A rotating shaft (76) is arranged at the center of the semi-circular shaft block (73). The rotating shaft (76) is movably installed corresponding to the central shaft slot (75). A plurality of second cutter heads (77) are annularly arranged on the bottom surface of the casing (51).

4. The down-the-hole grouting construction device according to claim 1, wherein, The driving mechanism (2) includes a rotating motor (21). The output shaft of the rotating motor (21) is fixedly connected downward with a fixed plate (22). Two connecting rods (23) are symmetrically fixed at the bottom of the fixed plate (22), and the connecting rods (23) penetrate through the connecting plate (52), and the connecting rods (23) are welded to the connecting plate (52).

5. The down-the-hole grouting construction device according to claim 1, characterized in that, A fixing ring (24) is sleeved on the lower part of the connecting rod (23). A threaded block (25) is arranged on the outer peripheral side of the casing (51) corresponding to the fixing ring (24). A screw rod (26) is also included. The screw rod (26) sequentially penetrates through the fixing ring (24) and the connecting rod (23) and is threadedly connected with the threaded block (25). The fixed plate (22) is installed and connected with the mast (11).

6. The down-the-hole grouting construction device according to claim 1, characterized in that, The screw slag discharging structure (3) includes a central shaft rod (31) fixed in the middle of the bottom surface of the fixed plate (22). A spiral blade (32) is wound around the outer peripheral side of the central shaft rod (31). An air flow channel (33) is arranged in the central shaft rod (31). The lower end of the air flow channel (33) is communicated with the down-the-hole hammer structure (6). An air delivery pipe (34) is arranged on the side surface of the top of the central shaft rod (31). One end of the air delivery pipe (34) is communicated with the top of the air flow channel (33), and the other end of the air delivery pipe (34) is connected with an air compressor (35).

7. The down-the-hole grouting construction device according to claim 1, characterized in that, The down-the-hole hammer structure (6) includes a hammer body (61). The top of the hammer body (61) is fixedly connected to the lower end of the central shaft rod (31). The upper part inside the hammer body (61) is an impactor (62), and the lower part of the hammer body (61) is a hammer head (63).

8. The down-the-hole grouting construction device according to claim 1, characterized in that, The lower end of the air flow channel (33) is communicated with the impactor (62). A main flow pipe (64) is arranged inside the hammer head (63). The upper end of the main flow pipe (64) is communicated with the impactor (62). A plurality of exhaust ports (65) are arranged at the bottom of the hammer head (63), and each of the exhaust ports (65) is respectively communicated with the lower end of the main flow pipe (64).

9. The down-the-hole grouting construction device according to claim 1, wherein The lifting and grouting structure (4) includes that electric telescopic rods (41) are respectively and fixedly installed at the lower ends of the connecting rods (23). The telescopic ends of the two electric telescopic rods (41) are arranged downward, and a lifting plate (42) is fixed to the telescopic ends of the two electric telescopic rods (41). A plurality of grouting pipes (43) are installed on the lifting plate (42), and the opposite ends of the grouting pipes (43) to the lifting plate (42) are respectively connected to a grouting machine (44).

10. A construction method for cast-in-place down-the-hole piles based on the down-the-hole grouting construction device according to any one of claims 1-9, characterized in that, It includes the following steps: 1) Move the pile driver main body (1) to the construction position where down-the-hole operation is required, and start the pile driver main body (1) to make the spiral slag discharging structure (3), the down-the-hole hammer structure (6), the lifting and grouting structure (4) and the sleeve structure (5) move vertically downward along the mast (11) as a whole; 2) Start the air compressor (35) and the rotating motor (21). The rotating motor (21) drives the spiral slag discharging structure (3), the down-the-hole hammer structure (6) and the sleeve structure (5) to rotate. The air compressor (35) conveys high-pressure gas to the impactor (62) through the air flow channel (33), so that the impact work and impact frequency generated by the operation of the impactor (62) can be directly transmitted to the hammer head (63), and cooperate with the rotational drive of the rotating motor (21) to form a pulsating crushing ability for the rock; 3) At the same time, the high-pressure waste gas generated by the impactor (62) is dispersed and flows through the main flow pipe (64) to be discharged from each exhaust port (65), thereby blowing away the broken rock particles, and at the same time blowing and cooling the impact part of the hammer head (63); 4) Through the rotation of the rotating motor (21), the casing (51) is driven to rotate, and then the second cutter head (77) at the bottom of the casing (51) is used to perform rotary excavation on the plot. At the same time, the rotation direction of the casing (51) is the same as the orientation of the first cutter head (74). The first cutter head (74) rotates with the semi-circular shaft block (73) in the arc-shaped shaft groove (72). Since the cross-section of the arc-shaped shaft groove (72) is a 3 / 4 circle structure, the maximum rotation angle of the semi-circular shaft block (73) in the arc-shaped shaft groove (72) is 90°, so that the first cutter head (74) pops out of the installation slot (71) to perform expansion rotary excavation on the side wall of the hole; 5) At the same time, the central shaft rod (31) drives the spiral blade (32) to rotate, and conveys the soil slag generated by the construction of the hammer head (63), the first cutter head (74) and the second cutter head (77) upward along the inside of the casing (51), and discharges it out of the hole through the vacant part between the fixed disk (22) and the connecting disk (52); 6) After the down-the-hole drilling is completed, start the electric telescopic rod (41). The lifting plate (42) moves downward along the outer peripheral side of the casing (51). When the lifting plate (42) moves to the bottom of the casing (51), start the grouting machine (44), and pour concrete into the bottom of the hole through the grouting pipe (43). While the grouting machine (44) is working, the main body of the pile driver (1) drives the spiral slag discharge structure (3), the down-the-hole hammer structure (6), the lifting and grouting structure (4) and the sleeve structure (5) to move upward and reset as a whole until they completely leave the down-the-hole and stop grouting, thus completing the construction.

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