Bored pile and high-pressure jet grouting pile integrated device and method under complex geological conditions

Abstract

The application relates to the field of bored pile equipment, and discloses a bored pile and high-pressure rotary jet pile integrated device and method under complex geological conditions. An auxiliary supporting sleeve is movably connected to the lower surface of the rotary excavator main body, a connecting port is welded to the outer surface of the lower end of the output rod, a protective shell is welded to the outer surface of the corresponding limiting ring of the output rod, a spiral block is movably connected to the outer surface of the limiting ring, a high-pressure rotary jet head is welded to the lower surface of the spiral block, a pouring cylinder is arranged on the upper surface of the high-pressure rotary jet head, and a soil sampler is arranged on the lower surface of the connecting port. The taper of the soil sampler ensures that the high-pressure rotary jet head cannot fall off, and the impurities generated in the drilling operation of the drill bit are collected through the extension motor, the pouring cylinder is poured with concrete, the effect of the bored pile is achieved, the overall equipment is extended and contracted to complete pouring, and when the high-pressure rotary jet pile is needed, the drill bit is rotated counterclockwise to drive the pouring cylinder and the high-pressure rotary jet head to move.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of bored pile equipment, in particular to a bored pile and high-pressure rotary jet pile integrated device and method under complex geological conditions. BACKGROUND

[0002] A bored pile refers to a pile formed by forming a pile hole in the ground through mechanical drilling, steel pipe soil compaction or manual excavation, and placing a steel reinforcement cage and pouring concrete in it. According to the hole forming method, the bored pile can be divided into several types such as pipe pile, bored pile and hole pile. Respectively, familiar with design drawings, specifications, standards; measurement and layout, preparation of working surface; construction technology preparation, before entering the site, reconnaissance of the construction site; hole preparation, drilling treatment, casing burial; mud wall forming, hole cleaning and mud replacement, concrete pouring; initial slurry filling the gap between steel bars, steel pile grouting, ensuring no cavities and impurities; complete pile forming operation.

[0003] High-pressure rotary jet pile is an advanced foundation reinforcement technology, widely used in foundation treatment and anti-seepage engineering under complex geological conditions. Its basic principle is to use a grouting pipe with a special nozzle to spray cement slurry in the form of high-pressure jet, impacting and cutting the soil, and mixing with the soil particles to form a cylindrical consolidated body. This method is not only suitable for silt, soft clay, sand and even sand and gravel in various geological environments, but also effectively solves the construction problems in deep stone filling soil and karst strata. The construction process of high-pressure rotary jet pile includes drilling, pipe insertion, jetting and lifting. Before construction, the high-pressure equipment and pipeline system need to be checked to ensure that the pressure and flow meet the design requirements, and attention should be paid to prevent the nozzle from being blocked. During construction, the drill rod is gradually lifted at a certain speed to forcibly mix the slurry with the soil particles, and after the slurry solidifies, a continuous and overlapping cement reinforced body is formed in the soil.

[0004] Bored pile and high-pressure rotary jet pile are common construction measures in equipment and mechanical piling. Bored pile and high-pressure rotary jet pile each have unique construction technology and advantages. Bored pile forms a pile body by pouring concrete after drilling, has the advantages of fast construction speed, suitable for soft ground, etc. High-pressure rotary jet pile sprays cement slurry into the soil through a high-pressure rotary nozzle and mixes with the soil to form a continuous and overlapping cement reinforced body, has the advantages of less construction area, less vibration, lower noise, etc. Due to the depth of piling, most of the time is under complex geological conditions. Traditional surveying mostly uses sampling analysis, which cannot fully consider the large-area construction, so the bored pile and high-pressure rotary jet pile equipment are usually more sophisticated, resulting in increased transportation cost and engineering cost. Both construction methods require drilling, pile pouring and many compatible work procedures.

[0005] However, in the traditional production operation, two construction methods require two operation devices, the cost is doubled, and it is not conducive to the economic efficiency of the project. SUMMARY

[0006] The purpose of the present application is to solve the above-mentioned problem of traditional production operation, two construction methods require two operation devices, the cost is doubled, and it is not conducive to the economic efficiency of the project. An integrated device for bored pile and high-pressure rotary jet pile under complex geological conditions is provided.

[0007] The technical scheme adopted by the present application is as follows:

[0008] An integrated device for bored pile and high-pressure rotary jet pile under complex geological conditions, comprising a rotary excavator main body, an auxiliary support sleeve movably connected to the lower surface of the rotary excavator main body, an output rod provided on the inner surface of the rotary excavator main body, the rotary excavator main body being used for vertical telescopic movement, the output rod being used for rotary excavation, a limit ring welded on the outer surface of the output rod, a protective shell welded on the outer surface of the output rod corresponding to the limit ring, a screw block threadedly connected to the limit ring, a high-pressure rotary jet head welded on the lower surface of the screw block, the limit ring being screwed into the high-pressure rotary jet head to block the rotary jet channel, the limit ring being screwed out of the high-pressure rotary jet head to open the rotary jet channel, a pouring cylinder provided on the upper surface of the high-pressure rotary jet head, and a soil sampler provided on the lower surface of the high-pressure rotary jet head, the soil sampler being internally provided with a drill bit for rotary pile hole excavation, the soil excavated by the drill bit being covered by the soil sampler and being discharged outside the output rod and the rotary excavator main body under the action of negative pressure.

[0009] Preferably, the pouring cylinder is fixedly connected with a blocking ring on the outer surface of the upper end, the blocking ring is located between the auxiliary support sleeve and the pouring cylinder, and the area surrounded between the pouring cylinder and the auxiliary support sleeve is used to hold the jet grouting material.

[0010] Preferably, the outer surface of the auxiliary support sleeve is movably connected with a clamping upper shell, and the inner surface of the clamping upper shell is welded with an inner limiting plate.

[0011] The inner surface of the inner limiting plate is movably connected with a movable clamping block, and the lower surface of the movable clamping block is movably connected with a clamping lower shell.

[0012] The clamping lower shell is provided with a displacement hole on the outer surface corresponding to the movable clamping block, and the lower surface of the displacement hole is welded with a fixing nail.

[0013] The upper surface of the clamping upper shell is welded with a fixed protruding block, and the upper surface of the clamping upper shell is welded with a reference mark beside the fixed protruding block.

[0014] Preferably, the outer surface of the rotary excavator main body corresponding to the fixed protruding block is provided with a support main body, and the outer surface of the support main body is welded with a fixed main body, the support main body being used to press down the fixed protruding block.

[0015] The outer surface of the support body is provided with an angle adjustment hydraulic rod, and the outer surface of one end of the angle adjustment hydraulic rod away from the support body is provided with a displacement vehicle.

[0016] Preferably, the bottom of the soil sampler is provided with an outer expansion structure for grabbing the hole wall to fix the soil sampler.

[0017] The outer expansion structure includes inclined installation holes and a limiting disc, the inclined installation holes are uniformly distributed on the bottom of the soil sampler and have consistent inclined angles, springs and locking pins are installed in the inclined installation holes, the locking pins are slidingly installed in the inner part of the inclined installation holes and are connected by the springs, the limiting disc is bolted to the bottom of the soil sampler to limit the extension length of the locking pins, and the inclined direction of the inclined installation holes and the limiting direction of the locking pins are opposite to the rotation direction when the drill bit drills.

[0018] Preferably, the cross section of the high-pressure rotary jet head is an L-shaped ring structure, the middle part of the bottom side of the ring structure is provided with an internal thread, and the internal thread is threadedly connected with a spiral block.

[0019] The spiral block is a hollow structure and is provided with a blocking ring body at the top, the blocking ring body is located in the inner part of the output rod, the middle part of the limiting ring is provided with an internal thread for connecting the spiral block, and a ratchet structure is arranged between the limiting ring and the blocking ring body for locking the blocking ring body and the limiting ring outside the extension of the spiral block.

[0020] The top of the high-pressure rotary jet head is provided with a partition disc, the partition disc is uniformly provided with water permeable holes, and the water permeable holes are provided with one-way conduction diaphragms.

[0021] Preferably, the inside of the soil sampler is connected with a mounting disc through a connecting column, the lower surface of the mounting disc is used for mounting a drill bit, a one-way feeding assembly is mounted on the outer edge of the mounting disc, and the one-way feeding assembly is used for continuously feeding the excavated soil into the output rod.

[0022] Preferably, the one-way feeding assembly includes supports mounted on the top of the mounting disc and uniformly arranged in a ring shape, ring-shaped steel bars are mounted on the supports, sleeves are rotatably mounted on the supports and penetrated by the ring-shaped steel bars, two asymmetrically distributed special-shaped rods are rotatably mounted on the sleeves, and feeding members are connected to the two special-shaped rods corresponding in position on the adjacent two sleeves, the feeding members are used for feeding soil, and a driver located in the inner periphery is mounted on the mounting disc, and the output end of the driver drives one of the sleeves to rotate through a gear structure.

[0023] Preferably, the drill bit and the locking pin are made of high-speed steel, and the blocking ring is made of hard plastic.

[0024] The use method of the above-mentioned integrated device of cast-in-place pile and high-pressure rotary jet pile under complex geological conditions is as follows:

[0025] Step one, preparation

[0026] The device finds the corresponding position through preliminary survey, and places the upper shell and the lower shell as a whole in the corresponding position to be drilled by means of the reference mark, fixes the device with fixing nails, adjusts the upper fixing protruding block, completes the angle and position adjustment of the movable clamping block, adjusts the corresponding clamping radius for clamping and fixing the auxiliary support sleeve, and ensures the clamping and fixing state of the movable clamping block by pressing the fixing protruding block of the support main body.

[0027] Step two, downward forward rotary digging

[0028] The rotary digging machine main body moves downward and drives the output rod to move downward, the output rod rotates forward during the downward movement, drives the bottom limiting ring to rotate, and the spiral block gradually enters the inside of the limiting ring until the limiting ring enters the inside of the high-pressure rotary jet head to block the rotary jet channel, and with the continuous downward drilling of the drill bit, the soil in the rotary digging process enters the output rod through the one-way intake assembly in the soil sampler, and is discharged through the output rod and the rotary digging machine main body under the action of negative pressure.

[0029] During the downward drilling process, the water inside the pile hole below the separation disc moves upward through the one-way conducting diaphragm.

[0030] Step three, upward reverse rotary jet

[0031] When the rotary digging operation is completed, the output rod operates reversely, and at the same time, the rotary digging machine main body drives the output rod to move upward, the locking pin at the bottom of the soil sampler is anchored in the hole bottom, and with the continuous reverse operation of the output rod, the spiral block is stretched out from the inside of the limiting ring, until the ratchet structure locks the two, the limiting ring moves out of the high-pressure rotary jet head, and the rotary jet channel is opened, at this time, the rotary jet mortar placed between the auxiliary support sleeve and the pouring cylinder is rotary jet poured concrete through the high-pressure rotary jet head, the water below the separation disc is filled with concrete, and the water below the separation disc is filled with concrete through the one-way conducting diaphragm, so that the bottom concrete structure is more compact, and at the same time, the water in the pile hole above the separation disc will extrude the one-way conducting diaphragm, preventing the downward movement of water and the upward movement of concrete through the separation disc, until the rotary jet operation of the pile hole is completed.

[0032] As described above, due to the adoption of the above technical scheme, the beneficial effects of the present application are:

[0033] In the present application, when the downward forward rotary digging is adopted, the limiting ring blocks the rotary jet channel of the high-pressure rotary jet head through the spiral block, so that only drilling operation is performed during the downward forward rotary digging. When the upward reverse rotary jet is performed, the limiting ring moves out of the high-pressure rotary jet head through the spiral block, and the rotary jet channel is opened, so that the rotary jet mortar is poured into concrete.

[0034] The auxiliary support sleeve is clamped and fixed at the top of the pile hole in the application, and the clamping state is maintained by fixing and clamping the upper shell through the downward pressing of the support body.

[0035] The locking pin is arranged at the bottom of the soil sampler in the application, and the high-pressure rotary jet head is relatively fixed when ascending and reverse rotary jetting, so that the limiting ring is separated from the high-pressure rotary jet head, the rotary jet channel is opened, and the reverse jet grouting operation is realized.

[0036] The water and concrete in the hole are separated by the separation disc when ascending and reverse rotary jetting, so that the influence of water and impurities in the hole on the strength of the pile body can be effectively reduced. BRIEF DESCRIPTION OF DRAWINGS

[0037] Figure 1 It is a schematic diagram of the overall appearance of the device of the application;

[0038] Figure 2 It is a schematic diagram of the main appearance of the device in the application;

[0039] Figure 3 It is an exploded view of the external structure of the device in the application;

[0040] Figure 4 It is an exploded view of the clamping structure of the device in the application;

[0041] Figure 5 It is an exploded view of the internal structure of the device in the application;

[0042] Figure 6 It is a schematic diagram of the internal operation structure of the device in the application.

[0043] Figure 7 It is a schematic diagram of the bottom structure of the soil sampler in the application.

[0044] Figure 8 It is a schematic diagram of the internal structure of the soil sampler in the application.

[0045] Figure 9 It is a schematic diagram of the one-way throughput assembly.

[0046] Figure 10 It is a structure relationship diagram of the special-shaped rod and the throughput member.

[0047] Markings in the figure:

[0048] 1, rotary excavator main body; 3, auxiliary support sleeve; 4, pouring cylinder; 5, high-pressure rotary jet; 51, separation disc; 52, one-way conduction diaphragm; 6, output rod; 7, protective shell; 8, limiting ring; 9, spiral block; 91, baffle ring body; 10, soil sampler; 101, oblique mounting hole; 102, spring; 103, locking pin; 105, connecting column; 106, mounting disc; 107, support; 108, driver; 109, ring-shaped reinforcement; 110, sleeve; 111, special-shaped rod; 112, swallowing and discharging piece; 11, drill bit; 12, plugging ring; 13, clamping upper shell; 14, inner limiting plate; 15, movable clamping block; 16, clamping lower shell; 17, displacement hole; 18, fixing nail; 19, fixed protruding block; 20, reference mark; 21, support main body; 22, fixed main body; 23, angle adjustment hydraulic rod; 24, displacement vehicle. DETAILED DESCRIPTION

[0049] To make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0050] Embodiment:

[0051] Reference Figures 1-10 A bored pile and high-pressure rotary jet pile integrated device under complex geological conditions, comprising a rotary excavator main body 1, the lower surface of the rotary excavator main body 1 is movably connected with an auxiliary support sleeve 3, and the inner surface of the rotary excavator main body 1 is provided with an output rod 6; the rotary excavator main body 1 is used for vertical telescopic movement, and the output rod 6 is used for rotary excavation; a limiting ring 8 is welded to the outer surface of the output rod 6; a protective shell 7 is welded to the outer surface of the limiting ring 8 corresponding to the output rod 6; a spiral block 9 is threadedly connected to the limiting ring 8; a high-pressure rotary jet head 5 is welded to the lower surface of the spiral block 9; the limiting ring 8 is screwed into the high-pressure rotary jet head 5 through the spiral block 9 to block the rotary jet channel; the limiting ring 8 is screwed out of the high-pressure rotary jet head 5 through the spiral block 9 to open the rotary jet channel; a pouring cylinder 4 is arranged on the upper surface of the high-pressure rotary jet head 5; and a soil sampler 10 is arranged on the lower surface of the high-pressure rotary jet head 5.

[0052] Specifically: the upper end of the pouring cylinder 4 is fixedly connected with a sealing ring 12, the sealing ring 12 is located between the auxiliary supporting sleeve 3 and the pouring cylinder 4, and the area surrounded between the pouring cylinder 4 and the auxiliary supporting sleeve 3 is used for containing the sprayed material. The pouring of the concrete is ensured when the reverse rotary spraying is performed.

[0053] Specifically: the outer surface of the auxiliary supporting sleeve 3 is movably connected with a clamping upper shell 13, and the inner surface of the clamping upper shell 13 is welded with an inner limiting plate 14;

[0054] The inner surface of the inner limiting plate 14 is movably connected with a movable clamping block 15, and the lower surface of the movable clamping block 15 is movably connected with a clamping lower shell 16;

[0055] The clamping lower shell 16 is provided with a displacement hole 17 on the outer surface corresponding to the movable clamping block 15, and the lower surface of the displacement hole 17 is welded with a fixing nail 18;

[0056] The upper surface of the clamping upper shell 13 is welded with a fixed protruding block 19, and the upper surface of the clamping upper shell 13 is welded with a reference mark 20 beside the fixed protruding block 19.

[0057] Specifically: the rotary digging machine body 1 is provided with a supporting body 21 on the outer surface corresponding to the fixed protruding block 19, and the outer surface of the supporting body 21 is welded with a fixed body 22, and the supporting body 21 is used for pressing down the fixed protruding block 19;

[0058] The outer surface of the supporting body 21 is provided with an angle adjusting hydraulic rod 23, and the outer surface of the one end of the angle adjusting hydraulic rod 23 away from the supporting body 21 is provided with a displacement vehicle 24.

[0059] Specifically: the bottom of the soil sampler 10 is provided with an outer expansion structure, and the outer expansion structure is used for grabbing the hole wall to fix the soil sampler 10;

[0060] The outer expansion structure includes inclined installation holes and a limiting disc, the inclined installation holes are uniformly distributed on the bottom of the soil sampler 10 and have consistent inclined angles, a spring 102 and a locking pin 103 are installed in each inclined installation hole 101, the locking pin 103 is slidably installed in the inner part of the inclined installation hole 101 and is connected through the spring 102, the limiting disc 104 is installed on the bottom of the soil sampler 10 through bolts and is used for limiting the extension length of the locking pin 103, and the inclined direction of the inclined installation hole 101 and the limiting direction of the locking pin 103 are opposite to the rotation direction of the drill bit 11 when drilling. When the reverse spraying is performed, the rotation of the soil sampler 10 and the high-pressure rotary spraying head 5 can be limited, so that the limiting ring 8 opens the rotary spraying channel.

[0061] Specifically: the cross section of the high-pressure rotary spraying head 5 is an L-shaped ring structure, the bottom side of the ring structure is provided with an inner thread, and the inner thread is threadedly connected with the spiral block 9;

[0062] Spiral block 9 is a hollow structure and the top is provided with a blocking ring body 91, which is located inside the output rod 6, the middle of the limiting ring 8 is provided with an internal thread for connecting the spiral block 9, the limiting ring 8 and the blocking ring body 91 are provided with a ratchet structure, which is used to lock the spiral block 9, the blocking ring body 91 and the limiting ring 8 outside the limiting ring 8;

[0063] The top of the high-pressure rotary jet head 5 is provided with a partition disc 51, which is uniformly distributed with water permeable holes, and a one-way conduction diaphragm 52 is arranged in the water permeable hole. The water in the hole and the poured concrete are separated as much as possible by the partition disc 51, which can effectively ensure the strength of the pile body and reduce the influence of water and impurities in the hole on the strength of the concrete as much as possible.

[0064] Specifically, the inside of the soil sampler 10 is connected with a mounting disc 106 through a connecting column 105, the lower surface of the mounting disc 106 is used for mounting a drill bit 11, and a one-way feeding assembly is mounted on the outer edge of the mounting disc 106, which is used to continuously feed the rotary-dug soil into the output rod 6.

[0065] Specifically, the one-way feeding assembly includes a support 107 mounted on the top of the mounting disc 106 and uniformly distributed in a ring shape, a ring-shaped reinforcing bar 109 mounted on the support 107, a sleeve 110 rotatably mounted on the support 107 and penetrated by the ring-shaped reinforcing bar 109, and two asymmetric rods 111 rotatably mounted on the sleeve 110 and symmetrically distributed, the two asymmetric rods 111 are respectively located on the two sides of the corresponding support 107, and a feeding piece 112 is connected to the two asymmetric rods 111 on the positions of the adjacent two sleeves 110, the feeding piece 112 is used to feed the soil, and a driver 108 is mounted on the mounting disc 106 and located in the inner periphery, and the output end of the driver 108 drives one of the sleeves 110 to rotate through a gear structure. The driver 108 (motor) drives the sleeve 110 to rotate through the gear structure, thereby realizing one-way feeding of the soil to the output rod 6 during drilling, and cooperating with the external negative pressure (prior art) to discharge the soil in the hole.

[0066] Specifically, the drill bit 11 and the locking pin 103 are made of high-speed steel, and the blocking ring 12 is made of hard plastic. High-speed steel is a commonly used excavator drill bit material, which has high hardness and thermal stability, is suitable for some relatively low strength materials, and is relatively affordable; the hard plastic material has high strength and corrosion resistance, which is convenient for corresponding fixed support and further ensures the vertical effect.

[0067] A method for using a bored pile and high-pressure rotary jet pile integrated device under complex geological conditions, comprising the following steps:

[0068] Step one, preparation

[0069] The device finds the corresponding position through preliminary survey, and places the whole clamped upper shell 13 and clamped lower shell 16 at the corresponding position to be drilled by the benchmark mark 20, fixes the device by the fixing nail 18, adjusts the upper fixing protruding block 19 to complete the angle and position adjustment of the movable clamping block 15, adjusts the corresponding clamping radius for clamping and fixing the auxiliary support sleeve 3, and ensures the clamping and fixing state of the movable clamping block 15 by pressing the fixing protruding block 19 through the support body 21.

[0070] Step two, downward forward rotary digging

[0071] The rotary digging machine body 1 goes downward and drives the output rod 6 to go downward, the output rod 6 rotates forward during the downward process, drives the bottom limiting ring 8 to rotate, and the spiral block 9 gradually enters the inside of the limiting ring 8 until the limiting ring 8 enters the inside of the high-pressure rotary jet head 5 to block the rotary jet channel, and the soil in the rotary digging process enters the output rod 6 through the one-way through component in the soil sampler 10 and is discharged through the output rod 6 and the rotary digging machine body 1 under the action of negative pressure;

[0072] During the downward drilling process, the water inside the pile hole below the separation disc 51 goes upward through the one-way through membrane 52;

[0073] Step three, upward reverse rotary jet

[0074] When the rotary digging operation is completed, the output rod 6 operates reversely, and the rotary digging machine body 1 drives the output rod 6 to go upward, the locking pin 103 at the bottom of the soil sampler 10 is anchored in the hole bottom, and the output rod 6 continues to operate reversely, which makes the spiral block 9 extend out of the limiting ring 8 until the ratchet structure locks the two, the limiting ring 8 moves out of the high-pressure rotary jet head 5 to open the rotary jet channel, at this time, the rotary jet mortar between the auxiliary support sleeve 3 and the pouring cylinder 4 is jetted and poured through the high-pressure rotary jet head 5, the concrete fills the water below the separation disc 51 through the one-way through membrane 52, so that the bottom concrete structure is more compact, and at the same time, the water in the pile hole above the separation disc 51 presses the one-way through membrane 52 to prevent the downward water and upward concrete from passing through the separation disc 51, until the rotary jet operation of the pile hole is completed.

[0075] The above embodiments are only used to illustrate the technical solutions of the present application, but not limit it; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. An integrated device for bored piles and high-pressure jet grouting piles under complex geological conditions, comprising a rotary drilling rig body (1), characterized in that: An auxiliary support sleeve (3) is movably connected to the lower surface of the rotary drilling rig body (1). An output rod (6) is provided on the inner surface of the rotary drilling rig body (1). The rotary drilling rig body (1) is used for vertical telescopic movement, and the output rod (6) is used for rotary drilling operations. A limit ring (8) is welded to the outer surface of the output rod (6), and the output rod (6) corresponds to the limit ring (8). of The outer surface is welded with a protective shell (7). The limiting ring (8) is threaded with a spiral block (9). The lower surface of the spiral block (9) is connected to a high-pressure rotary nozzle (5). The limiting ring (8) is screwed into the high-pressure rotary nozzle (5) through the spiral block (9) to block the rotary nozzle channel. The limiting ring (8) is screwed out of the high-pressure rotary nozzle (5) through the spiral block (9) to open the rotary nozzle channel. The upper surface of the high-pressure rotary nozzle (5) is provided with an injection cylinder (4). The lower surface of the high-pressure rotary nozzle (5) is provided with a soil sampler (10). The soil sampler (10) is provided with a drill bit (11) for rotary drilling of pile holes. The soil sampler (10) covers the soil drilled by the drill bit (11) and discharges it through the output rod (6) and the main body (1) of the rotary drilling machine under negative pressure. A sealing ring (12) is fixedly connected to the outer surface of the upper end of the grouting cylinder (4). The sealing ring (12) is located between the auxiliary support sleeve (3) and the grouting cylinder (4), and the area enclosed between the grouting cylinder (4) and the auxiliary support sleeve (3) is used to hold the shotcrete material. The outer surface of the auxiliary support sleeve (3) is movably connected to the clamping upper shell (13), and the inner surface of the clamping upper shell (13) is welded with an inner limiting plate (14). The inner surface of the inner limiting plate (14) is movably connected to a movable clamping block (15), and the lower surface of the movable clamping block (15) is movably connected to a clamping lower shell (16). The outer surface of the clamping shell (16) corresponding to the movable clamping block (15) is provided with a displacement hole (17), and a fixing nail (18) is welded to the lower surface of the displacement hole (17). A fixing protrusion (19) is welded to the upper surface of the clamping upper outer shell (13), and a reference mark (20) is welded to the upper surface of the clamping upper outer shell (13) next to the fixing protrusion (19). The rotary drilling rig body (1) is provided with a support body (21) on the outer surface of the fixed protrusion (19), and a fixed body (22) is welded to the outer surface of the support body (21). The support body (21) is used to press down the fixed protrusion (19). An angle-adjusting hydraulic rod (23) is provided on the outer surface of the support body (21), and a displacement vehicle (24) is provided on the outer surface of the end of the angle-adjusting hydraulic rod (23) away from the support body (21). The bottom of the soil sampler (10) is provided with an external expansion structure, which is used to grip the hole wall to fix the soil sampler (10). The expansion structure includes an inclined mounting hole and a limiting plate. The inclined mounting holes are evenly distributed on the bottom of the soil sampler (10) and the inclined angles are all the same. A spring (102) and a locking pin (103) are installed in the inclined mounting hole (101). The locking pin (103) is slidably installed inside the inclined mounting hole (101) and connected by the spring (102). The limiting plate (104) is installed on the bottom of the soil sampler (10) by bolts to limit the extension length of the locking pin (103). The inclined direction of the inclined mounting hole (101) and the limiting direction of the locking pin (103) are opposite to the rotation direction of the drill bit (11) when drilling.

2. The integrated device for bored piles and high-pressure jet grouting piles under complex geological conditions as described in claim 1, characterized in that: The high-pressure rotary nozzle (5) has an L-shaped annular structure in cross section. An internal thread is provided in the middle of the bottom side of the annular structure, and the internal thread is threadedly connected to the spiral block (9). The spiral block (9) has a hollow structure and a retaining ring body (91) is provided on the top. The retaining ring body (91) is located inside the output rod (6). The middle of the limiting ring (8) is provided with an internal thread for connecting the spiral block (9). A ratchet structure is provided between the limiting ring (8) and the retaining ring body (91) for locking the retaining ring body (91) and the limiting ring (8) outside the limiting ring (8) of the spiral block (9). The top of the high-pressure rotary nozzle (5) is provided with a partition plate (51), and water-permeable holes are evenly distributed on the partition plate (51). A one-way diaphragm (52) is provided in the water-permeable hole.

3. The integrated device for bored piles and high-pressure jet grouting piles under complex geological conditions as described in claim 2, characterized in that: The soil sampler (10) is connected to a mounting plate (106) via a connecting column (105). The lower surface of the mounting plate (106) is used to mount a drill bit (11). A one-way feed assembly is mounted on the outer edge of the mounting plate (106). The one-way feed assembly is used to continuously feed the rotary-dug soil into the output rod (6).

4. The integrated device for bored piles and high-pressure jet grouting piles under complex geological conditions as described in claim 3, characterized in that: The unidirectional throughput assembly includes a support (107) installed on the top of the mounting plate (106) and evenly distributed in a ring. A ring-shaped steel bar (109) is installed on the support (107). A sleeve (110) is rotatably installed on the support (107) and the ring-shaped steel bar (109) passes through the sleeve (110). Two symmetrically distributed irregular rods (111) are rotatably installed on the sleeve (110). Two throughput components (112) are connected to the two irregular rods (111) at corresponding positions on two adjacent sleeves (110). The throughput components (112) are used to throughput soil. A driver (108) located in the inner perimeter is installed on the mounting plate (106). The output end of the driver (108) drives one of the sleeves (110) to rotate through a gear structure.

5. The integrated device for bored piles and high-pressure jet grouting piles under complex geological conditions as described in claim 4, characterized in that: The drill bit (11) and locking pin (103) are both made of high-speed steel, and the sealing ring (12) is made of hard plastic.

6. The method of using the integrated device for bored piles and high-pressure jet grouting piles under complex geological conditions as described in claim 5, characterized in that: Step 1: Preparation The device finds the corresponding position through preliminary survey, and places the upper outer shell (13) and lower outer shell (16) of the device as a whole in the corresponding position to be drilled and injected by the reference mark (20). The device is fixed by the fixing nail (18), and the upper fixing protrusion (19) is adjusted to complete the angle and position adjustment of the movable clamping block (15). The radius of the corresponding clamping is adjusted for clamping and fixing the auxiliary support sleeve (3). The supporting body (21) presses down the fixing protrusion (19) to ensure the clamping and fixing state of the movable clamping block (15). Step 2, downward rotary drilling The rotary drilling rig body (1) moves downward and drives the output rod (6) downward. During the downward movement of the output rod (6), it rotates in the forward direction, driving the bottom limit ring (8) to rotate. The spiral block (9) will gradually enter the inside of the limit ring (8) until the limit ring (8) enters the inside of the high-pressure rotary nozzle (5) to block the rotary nozzle channel. As the drill bit (11) continues to move downward, it performs the drilling operation of the pile hole. The soil in the rotary drilling process enters the output rod (6) through the soil sampler (10) through the one-way swallow and spit component, and is discharged through the output rod (6) and the rotary drilling rig body (1) under negative pressure. During the downward drilling process, the water inside the pile hole located below the partition plate (51) will rise through the unidirectional diaphragm (52); Step 3, upward reverse swirl spray After the rotary drilling operation is completed, the output rod (6) operates in reverse. At the same time, the main body (1) of the rotary drilling machine drives the output rod (6) to move upward. The locking pin (103) at the bottom of the soil sampler (10) will be anchored in the bottom of the hole. As the output rod (6) continues to operate in reverse, the spiral block (9) will extend from the limiting ring (8) inside and outside until the ratchet structure locks the retaining ring body (91) and the limiting ring (8). The limiting ring (8) moves out from the high-pressure rotary nozzle (5) and opens the rotary grouting channel. At this time, the concrete placed between the auxiliary support sleeve (3) and the grouting cylinder (4) is grouted by the high-pressure rotary nozzle (5). The water filled in the concrete below the partition plate (51) passes through the one-way guiding membrane (52), making the bottom concrete structure more compact. At the same time, the water in the pile hole at the top of the partition plate (51) will squeeze the one-way guiding membrane (52), preventing the water from going down and the concrete from going up through the partition plate (51) until the rotary grouting operation of the pile hole is completed.

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