Full-recovery mute rotary pile extractor and pile extraction construction equipment

Abstract

The invention discloses a full-recovery mute rotary pile extractor and pile extraction construction equipment, and belongs to the field of engineering construction equipment. A plurality of alloy drill bits and high-pressure sprayers are distributed on the periphery of the bottom of a pile casing assembly of the full-recovery mute rotary pile extractor, the alloy drill bits are provided with outer rotating alloy drill bits and inner rotating alloy drill bits, and the spraying directions of the high-pressure sprayers face the outer side and the inner side of the wall of the pile casing assembly respectively; a pile pulling mechanism is further arranged at the bottom of the pile casing assembly. When the soil body is rapidly cut, high-pressure jet flow is used for cutting the soil body and taking drilling slag out of a hole, the design of the inner alloy drill bit, the outer alloy drill bit and the high-pressure spray head can cut the soil body on the outer side of the pile casing and can also cut the soil body between the pile casing and a to-be-pulled pile body, torsion generated by drilling of the pile casing to the to-be-pulled pile body is reduced, and damage to the pile body is avoided; the purpose of lossless recovery of old piles is achieved; the construction efficiency is high, the construction noise is low, the environmental protection property is good, the construction depth is large, the adaptability is high, the operation is simple, and the cost is low.

Description

Technical Field

[0001] The invention relates to a pile foundation removal construction equipment, and more specifically to a fully-recoverable silent rotary pile puller and pile pulling construction equipment. Background Art

[0002] With the acceleration of urbanization and the continuous renewal of infrastructure construction, the number of old building demolition and site renovation projects is increasing. In these projects, removing old piles is a critical and complex construction task. The existence of old piles not only hinders the construction of new buildings, but also poses a potential threat to the surrounding environment and underground facilities. Therefore, it is of great practical significance to develop an efficient, environmentally friendly, safe and silent pile removal construction equipment.

[0003] Existing pile pulling technologies mainly include manual pile pulling, hydraulic pile pulling machine pile pulling, vibration pile pulling and full-rotation CRD method pile pulling, among which:

[0004] Manual pile pulling mainly relies on manpower to apply tension to the pile through simple mechanical devices (such as levers, pulleys, etc.) to pull it out. This method is not only labor-intensive, but also due to low operating precision, it is easy to cause the pile body to break or be damaged during the pulling process and cannot be reused. For example, in some small projects, the pile body is often pulled apart due to uneven force during manual pile pulling, resulting in material waste.

[0005] The hydraulic pile puller drives the pile clamp through the hydraulic system to clamp the pile body, and then uses the lifting force of the hydraulic cylinder to pull up the pile section by section. Although the hydraulic pile puller has a large pulling force, the pile body is easily subjected to large shear and tensile forces during the pulling process because it needs to be pulled up section by section, resulting in damage to the pile body. In addition, the pile clamp of the hydraulic pile puller may damage the surface of the pile body during the clamping process, further reducing the reuse value of the pile body.

[0006] Vibratory pile pullers use the principle of vibration to apply high-frequency vibration to the pile body through a vibratory hammer to loosen the soil around the pile body, thereby reducing the resistance to pile pulling. However, the high-frequency vibration generated by the vibratory pile puller during operation will not only cause noise pollution to the surrounding environment, but also easily cause damage to the internal structure of the pile body. For example, for some old concrete piles, vibration may reduce the bonding force between the steel bars and concrete inside the pile body, resulting in the pile body being unable to be reused after being pulled out. Moreover, the vibratory pile puller applies high-frequency vibration to the pile body through a vibratory hammer to loosen the soil around the pile body, thereby reducing the resistance to pile pulling. However, the vibration power of the vibratory pile puller is limited. For deeper or thicker piles, the vibration effect is not good, and the pile pulling depth is limited. For example, for a pile with a depth of more than 20 meters, the vibratory pile puller may not be able to effectively loosen the soil around the pile body, resulting in failure of pile pulling. In addition, the vibratory pile puller will generate high-intensity noise during operation, which has a serious impact on the surrounding environment and residents' lives. For example, in some projects close to schools, hospitals or residential areas, the noise of the vibratory pile puller may cause complaints from residents.

[0007] The cross rotation drilling (CRD) method is a relatively advanced pile extraction technology. It uses a rotary drill to cut the soil around the pile body, and then uses a hydraulic system to pull out the pile body. However, this method requires the use of a special full rotation drilling rig and supporting hydraulic equipment, and the equipment cost is relatively high. For example, the price of a full rotation drilling rig is usually several million yuan, which is a huge investment for some small construction units. In addition, the operation of the full rotation CRD method is relatively complicated and requires professional technicians to operate and maintain it; the commissioning and maintenance of the equipment also requires a lot of time and effort, further increasing the construction cost. Although the full rotation CRD method can pull out the pile body relatively completely, the construction time is relatively long because it requires cutting operations around the pile body. For example, for a deeper pile, it may take several days to complete the pile extraction operation, and the construction efficiency is low. In order to improve the soil cutting efficiency around the pile body, there is currently a method of rotating and cutting the soil while spraying high-pressure water, such as the "Existing Pile Extraction Method" disclosed in Japanese Patent Publication No. JPH06116955A (the patent publication date is April 26, 1994) and the "A Full Rotation Quick Cutting Obstacle Removal Construction Method and Construction Equipment" disclosed in Chinese Patent Publication No. CN101358452A (the patent publication date is February 4, 2009). They set cutting blades and high-pressure nozzles at the lower end of the casing. During construction, the casing is rotated while high-pressure water is sprayed from the nozzle to reduce the friction between the casing and the ground. This pile extraction process can improve the soil cutting efficiency through high-pressure water, which helps to improve construction efficiency, and there is basically no vibration and noise during the construction process. However, the above technical solution only considers the friction between the casing and the soil. Since there is also soil adhesion between the casing and the pile to be pulled out, a large torque will be generated on the pile to be pulled out during the process of the casing rotating and drilling into the soil, which can easily cause damage to the pile. In the process of pulling out the old pile, the steel wire rope is mainly used to pull it out. During the pulling process, the pile is easily subjected to large shear force and tension, which can also easily cause damage to the pile. In addition, since the drilling slag is not easy to be discharged during the construction process, the actual drilling efficiency is still low, especially for deeper piles, the construction time is still long.

[0008] In addition, there are also processes in the prior art for constructing casing by means of vibration and static pressure, but the construction efficiency of vibration and static pressure is low, and for deeper piles, the pile pulling construction period is longer; although some casings are provided with a pile pulling hook structure at the bottom, this pile pulling hook is in a contracted state during the casing pressing down process, and can be opened to hook the bottom of the pile body during the casing pulling up process, and pulled out together with the casing, thereby reducing damage to the pile body, but during the casing pressing down process, vibration and static pressure can easily squeeze the pile body through the soil, thereby causing damage to the pile body.

[0009] In summary, most of the existing pile extraction construction equipment will damage the old piles during the construction process, making it impossible to recycle the old piles; and the overall construction efficiency is not high, especially for piles with deeper depths and larger diameters, the pile extraction construction time is longer or even fails. Summary of the invention

[0010] 1. Technical problem to be solved by the invention

[0011] The purpose of the present invention is to overcome the shortcomings of existing pile pulling construction equipment and processes such as the inability to recover old piles without loss and low construction efficiency, and to provide a fully recoverable silent rotary pile puller and pile pulling construction equipment. The technical solution of the present invention is adopted to drive the casing assembly to rotate at high speed by using a high-speed hydraulic power head, and cooperate with the alloy drill bit and high-pressure nozzle at the bottom of the casing assembly to use high-pressure jet to cut the soil and bring the drill residue out of the hole when quickly cutting the soil. At the same time, the internal and external alloy drill bits and high-pressure nozzle design can not only cut the soil outside the casing, but also cut the space between the casing and the pile to be pulled out. The soil body is formed by the casing and the pile body to be pulled out, so that there is no soil adhesion between the casing and the pile body to be pulled out, reducing the torque generated by the casing drilling on the pile body to be pulled out, and cooperating with the pile pulling mechanism at the bottom of the casing, the pile can be lifted and pulled out from the bottom of the pile body to be pulled out, thereby ensuring the integrity of the pile body to be pulled out, avoiding damage to the pile body, and achieving the purpose of non-destructive recovery of old piles; and the high-pressure jet can flush the alloy drill bit and quickly take out the drill cuttings, greatly improving the drilling efficiency and depth, and greatly improving the efficiency of pile pulling construction; at the same time, the rotary pile pulling construction has low noise, good environmental protection, deep construction depth, strong adaptability, simple operation and low cost.

[0012] 2. Technical solution

[0013] In order to achieve the above object, the technical solution provided by the present invention is:

[0014] A fully recoverable silent rotary pile puller of the present invention comprises a casing assembly, a multi-channel rotary diverter and a high-speed hydraulic power head, wherein the high-speed hydraulic power head is coaxially connected to the casing assembly through the multi-channel rotary diverter and is used to drive the casing assembly to rotate at high speed to cut the soil; wherein,

[0015] A plurality of alloy drill bits and high-pressure nozzles are distributed around the bottom of the casing assembly, and the alloy drill bits include an outward-rotating alloy drill bit distributed on the outer side of the casing wall of the casing assembly and an inward-rotating alloy drill bit distributed on the inner side of the casing wall of the casing assembly. The outward-rotating alloy drill bit and the inward-rotating alloy drill bit quickly cut the soil inside and outside the casing wall of the casing assembly to form drill cuttings during the high-speed rotation of the casing assembly; the high-pressure nozzle is connected to the outlet joint of the multi-channel rotary diverter through a high-pressure connecting pipe arranged on the inner wall of the casing assembly, and the spraying direction of the high-pressure nozzle is toward the outer side and the inner side of the casing wall of the casing assembly respectively; the high-pressure nozzle is connected to the high-pressure circulating fluid and the high-pressure gas at least through the multi-channel rotary diverter, and forms internal and external high-pressure jets through the high-pressure nozzle to cut the soil and bring the drill cuttings out of the hole;

[0016] The bottom of the casing assembly is also provided with a pile pulling mechanism, which has a retracted drilling state and an extended pile pulling state. When the casing assembly is drilled and sunk, the pile pulling mechanism is in the retracted drilling state, so that the pile body to be pulled out passes through the pile pulling mechanism and enters the casing assembly; when the casing assembly drills to the pile bottom of the pile body to be pulled out and pulls up, the pile pulling mechanism switches to the extended pile pulling state, so that the pile pulling mechanism is buckled with the bottom of the pile body to be pulled out and pulled out together with the casing assembly.

[0017] Furthermore, a spiral blade for discharging drilling cuttings is further provided on the outer wall of the casing assembly; and an auxiliary cutting alloy blade is selectively provided on a section of the spiral blade close to the bottom of the casing assembly.

[0018] Furthermore, the pile pulling mechanism includes at least two groups of self-limiting baffles evenly distributed at the bottom of the casing assembly, the self-limiting baffles are installed at the bottom of the casing assembly by a rotating mounting seat, and the self-limiting baffles can flip and move in the radial direction. When the casing assembly is drilled and sunk, the self-limiting baffles flip upward and shrink at the inner pipe wall of the casing assembly; when the casing assembly drills to the bottom of the pile body to be pulled out and pulls up, the self-limiting baffles flip toward the center of the casing assembly and are limited in a horizontal position.

[0019] Furthermore, the casing assembly at least includes a connecting steel sleeve and a drilling steel sleeve, the upper end of the connecting steel sleeve is provided with a sleeve upper joint for connecting to a multi-channel rotary diverter, the lower end of the connecting steel sleeve is provided with a sleeve male joint, the upper end of the drilling steel sleeve is provided with a sleeve female joint matched with the sleeve male joint, the sleeve male joint can be inserted into the sleeve female joint and fixedly connected by circumferentially arranged connecting pins, the lower end of the drilling steel sleeve is fixedly provided with a drilling ring, and the alloy drill bit and pile pulling mechanism are respectively mounted on the drilling ring.

[0020] Furthermore, the casing assembly also includes a plurality of intermediate steel sleeves arranged between the connecting steel sleeve and the drilling steel sleeve, the upper end of the intermediate steel sleeve is provided with a sleeve female joint, and the lower end is provided with a sleeve male joint, the sleeve female joint at the upper end of the intermediate steel sleeve can be plugged into the sleeve male joint at the lower end of the upper adjacent intermediate steel sleeve or the sleeve male joint at the lower end of the connecting steel sleeve and fixedly connected through circumferentially arranged connecting pins; the sleeve male joint at the lower end of the intermediate steel sleeve can be plugged into the sleeve female joint at the upper end of the lower adjacent intermediate steel sleeve or the sleeve female joint at the upper end of the drilling steel sleeve and fixedly connected through circumferentially arranged connecting pins.

[0021] Furthermore, the multi-channel rotary diverter includes a rotating seat and a diverter seat, the rotating seat is connected to the diverter seat for relative rotation, more than two annular grooves and a plurality of seals are provided between the rotating seat and the diverter seat, the rotating seat is provided with a diverter channel connected to the corresponding annular groove, the lower end of each of the diverter channels has an outlet joint, and the diverter seat is provided with an inlet joint connected to the corresponding annular groove.

[0022] Furthermore, the alloy drill bit includes a drill rod and alloy cutting teeth embedded in the lower end of the drill rod, the upper end of the drill rod has an adjustable angle plug-in portion, the adjustable angle plug-in portion can be plugged and installed on the bottom surface of the drilling ring and fixed by a locking nut, the alloy cutting teeth are eccentrically arranged between the adjustable angle plug-in portion, and the position of the alloy cutting teeth is adjusted by the plug-in angle of the adjustable angle plug-in portion on the bottom surface of the drilling ring.

[0023] Furthermore, the high-pressure nozzle extends to the bottom of the drilling section steel sleeve through a high-pressure connecting pipe, and the high-pressure nozzle has a two-way nozzle in an inverted "V" shape structure, the spray direction of one nozzle is toward the outer side of the barrel wall of the casing assembly, and the spray direction of the other nozzle is toward the inner side of the barrel wall of the casing assembly.

[0024] Furthermore, a hydraulic vibrator is also provided at the upper end of the high-speed hydraulic power head.

[0025] A pile pulling construction equipment of the present invention comprises a drilling rig and the above-mentioned fully recoverable silent rotary pile puller, wherein the drilling rig comprises a traveling chassis and a lifting mast mounted on the traveling chassis, a clamp is provided on the lifting mast, and a high-speed hydraulic power head of the fully recoverable silent rotary pile puller is fixedly mounted on the clamp.

[0026] 3. Beneficial effects

[0027] Compared with the existing known technologies, the technical solution provided by the present invention has the following significant effects:

[0028] (1) A fully recoverable silent rotary pile puller of the present invention comprises a casing assembly, a multi-channel rotary diverter and a high-speed hydraulic power head. A plurality of alloy drill bits and high-pressure nozzles are distributed around the bottom of the casing assembly. The alloy drill bits include an outward-rotating alloy drill bit distributed on the outer side of the casing assembly wall and an inward-rotating alloy drill bit distributed on the inner side of the casing assembly wall. The spraying directions of the high-pressure nozzles are respectively toward the outer side and the inner side of the casing assembly wall. The bottom of the casing assembly is also provided with a pile pulling mechanism that can be buckled with the bottom of the pile body to be pulled out. The high-speed hydraulic power head is used to drive the casing assembly to rotate at a high speed, and the alloy drill bit and the high-pressure nozzle at the bottom of the casing assembly are used to quickly cut the soil body by using the high-pressure jet to cut the soil body and remove the drill cuttings. In addition to the hole, the internal and external alloy drill bits and high-pressure nozzle design can not only cut the soil outside the casing, but also cut the soil between the casing and the pile to be pulled out, so that there is no soil adhesion between the casing and the pile to be pulled out, reducing the torque generated by the casing drilling on the pile to be pulled out, and cooperating with the pile pulling mechanism at the bottom of the casing, the pile can be lifted and pulled out from the bottom of the pile to be pulled out, thereby ensuring the integrity of the pile to be pulled out, avoiding damage to the pile body, and achieving the purpose of lossless recovery of old piles; and the high-pressure jet can flush the alloy drill bit and quickly take out the drill slag, greatly improving the drilling efficiency and depth, and greatly improving the efficiency of pile pulling construction; at the same time, the rotary pile pulling construction has low noise, good environmental protection, deep construction depth, strong adaptability, simple operation and low cost.

[0029] (2) A fully recoverable silent rotary pile puller of the present invention is provided with a spiral blade for discharging drill cuttings on the outer wall of its casing assembly. The high-speed rotation of the casing and the lifting effect of the spiral blade can help to quickly carry the drill cuttings out of the hole, thereby preventing the drill cuttings from settling at the bottom of the hole and affecting the drilling efficiency. In addition, a section of the spiral blade near the bottom of the casing assembly is selectively provided with an auxiliary cutting alloy blade, which can assist in cutting the soil outside the casing, thereby further improving the efficiency of the drilling rig.

[0030] (3) A fully recoverable silent rotary pile puller of the present invention comprises at least two groups of self-limiting baffles evenly distributed at the bottom of the casing assembly. The self-limiting baffles are mounted at the bottom of the casing assembly by a rotating mounting seat and can flip in the radial direction. When the casing assembly is drilled and sunk, the self-limiting baffles flip upward and shrink at the inner tube wall of the casing assembly. When the casing assembly drills to the bottom of the pile body to be pulled out and pulls up, the self-limiting baffles flip toward the center of the casing assembly and are limited in a horizontal position. The pile pulling mechanism has a simple and compact structure and does not require auxiliary equipment such as a crane. The pile body is less damaged during the pile pulling process, and the pile pulling is convenient and quick.

[0031] (4) The fully recyclable silent rotary pile puller of the present invention has a casing assembly which includes at least a connecting steel sleeve and a drilling steel sleeve. An intermediate steel sleeve may be provided between the connecting steel sleeve and the drilling steel sleeve. The multi-section design can meet the needs of pulling out piles of different depths, and in particular, can achieve non-destructive pulling out of very deep piles. Furthermore, the steel sleeves are conveniently connected, and the connection is firm and reliable.

[0032] (5) The fully recoverable silent rotary pile puller of the present invention has a multi-channel rotary diverter including a rotating seat and a diverter seat, which can realize the establishment of multiple channels, so that the high-pressure nozzle can rotate and cut the soil with high pressure jet, thereby improving the casing drilling efficiency; and the multi-channel design can be connected to high-pressure circulating fluid and high-pressure gas respectively, and the high-pressure gas is used to prevent the drill cuttings formed by the soil cut by the alloy drill bit and the drill cuttings formed by the jet of high-pressure circulating fluid from settling at the bottom of the hole, and the drill cuttings are carried out of the hole efficiently, which can improve the drilling efficiency on the one hand, and reduce the torque generated between the casing and the pile body to be pulled out on the other hand, thereby protecting the pile body to be pulled out from damage.

[0033] (6) The present invention is a fully recyclable silent rotary pile puller, wherein the alloy drill bit comprises a drill rod and alloy cutting teeth embedded in the lower end of the drill rod, and the upper end of the drill rod has an adjustable angle plug-in portion, which can be plugged and installed on the bottom surface of the drilling ring and fixed by a locking nut. The alloy cutting teeth are eccentrically arranged between the adjustable angle plug-in portion, and the position of the alloy cutting teeth is adjusted by the plug-in angle of the adjustable angle plug-in portion on the bottom surface of the drilling ring. The alloy drill bit can be adjusted in angle according to the geological survey report and the parameters of the pile body to be pulled out before construction, and has strong applicability, simple structure, convenient manufacturing, and flexible and convenient angle adjustment operation.

[0034] (7) The fully recoverable silent rotary pile puller of the present invention has a high-pressure nozzle extending to the bottom of the drilling section steel sleeve through a high-pressure connecting pipe. The high-pressure nozzle has a two-way nozzle in an inverted "V" shape. The spray direction of one nozzle is toward the outer side of the barrel wall of the casing assembly, and the spray direction of the other nozzle is toward the inner side of the barrel wall of the casing assembly. The "V"-shaped two-way nozzle design can take into account the high-pressure jet spraying inside and outside the casing, quickly cut and disintegrate the soil inside and outside the casing, and has a simple structure and is easy to manufacture and install.

[0035] (8) The fully recoverable silent rotary pile puller of the present invention is also provided with a hydraulic vibrator at the upper end of its high-speed hydraulic power head. For hard formations, the hydraulic vibrator can vibrate the casing at a high frequency, so that the alloy drill bit at the bottom of the casing can impact the hard formation while rotating, thereby improving the drilling efficiency of the hard formation.

[0036] (9) A pile pulling construction equipment of the present invention comprises a drilling rig and the above-mentioned fully-recoverable silent rotary pile puller, wherein the drilling rig comprises a traveling chassis and a lifting mast mounted on the traveling chassis, a clamp is provided on the lifting mast, and a high-speed hydraulic power head of the fully-recoverable silent rotary pile puller is fixedly mounted on the clamp; by adopting the pile pulling construction equipment, the casing can be drilled in and pulled out by utilizing the lifting mast, the equipment is simple, and the investment cost is low. Compared with the existing pile pulling process, the number of piles pulled per day can reach more than 10, and the pile pulling efficiency is greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a schematic diagram of the disassembled structure of a fully recoverable silent rotary pile puller of the present invention;

[0038] Figure 2 It is a schematic diagram of the assembly structure of a fully recoverable silent rotary pile puller of the present invention;

[0039] Figure 3 It is a schematic cross-sectional view of a fully recoverable silent rotary pile puller of the present invention;

[0040] Figure 4 for Figure 3 A schematic diagram of the local enlarged structure at point A in the middle;

[0041] Figure 5 for Figure 3 A schematic diagram of the local enlarged structure at B in the middle;

[0042] Figure 6 It is a schematic diagram of the assembly structure of the intermediate steel sleeve in the present invention;

[0043] Figure 7 It is a schematic diagram of the split structure of the intermediate steel sleeve in the present invention;

[0044] Figure 8 The bottom structure schematic diagram of the drilling section steel sleeve in the present invention (the self-limiting baffle is in the retracted drilling state);

[0045] Fig. 9 The bottom cross-sectional structure diagram of the drilling section steel sleeve in the present invention (the self-limiting baffle is in a retracted drilling state);

[0046] Fig.10 It is a schematic diagram of the bottom structure of the drilling section steel sleeve in the present invention (the self-limiting baffle is in the unfolded pile pulling state);

[0047] Fig.11 It is a schematic diagram of the bottom cross-sectional structure of the drilling section steel sleeve in the present invention (the self-limiting baffle is in the unfolded pile pulling state);

[0048] Fig.12 It is a schematic diagram of the structure of the alloy drill bit of the present invention;

[0049] Fig.13 It is a structural schematic diagram of the high-pressure nozzle in the present invention;

[0050] Fig.14 It is a three-dimensional structural schematic diagram of a drilling rig in a pile pulling construction equipment of the present invention;

[0051] Fig.15 It is a three-dimensional structural schematic diagram of a pile pulling construction equipment of the present invention;

[0052] Fig.16 It is a schematic diagram of the construction status of a pile pulling construction equipment of the present invention.

[0053] Explanation of the symbols in the schematic diagram:

[0054] 100, casing assembly; 110, connecting steel sleeve; 111, sleeve upper joint; 120, drilling steel sleeve; 121, drilling ring; 122, alloy drill bit; 122a, external rotation alloy drill bit; 122b, internal rotation alloy drill bit; 122-1, drill bit rod; 122-2, alloy cutting teeth; 122-3, adjustable angle plug-in part; 122-4, locking nut; 123, high-pressure nozzle; 124, rotating mounting seat; 125, self-limiting baffle; 130, intermediate steel sleeve; 101, spiral blade; 102, sleeve male joint; 103, sleeve female joint; 104, high-pressure connecting pipe; 105, connecting pin;

[0055] 200, multi-channel rotary diverter; 201, rotating seat; 202, diverter seat; 203, annular groove; 204, sealing element; 205, diverter channel; 206, inlet connector; 207, outlet connector;

[0056] 300, high-speed hydraulic power head; 400, hydraulic vibrator; 500, pile to be pulled out;

[0057] 600, drilling rig; 601, traveling chassis; 602, operating cab; 603, lifting mast; 604, clamp; 605, drilling rig hydraulic pump unit. DETAILED DESCRIPTION

[0058] In order to further understand the content of the present invention, the present invention is described in detail in conjunction with the accompanying drawings and embodiments.

[0059] [Example]

[0060] Combination Figures 1 to 3 as well as Figures 8 to 11As shown, a fully-recoverable silent rotary pile puller of this embodiment includes a casing assembly 100, a multi-channel rotary diverter 200 and a high-speed hydraulic power head 300. The high-speed hydraulic power head 300 is coaxially connected to the casing assembly 100 through the multi-channel rotary diverter 200, and is used to drive the casing assembly 100 to rotate at high speed to cut the soil; the multi-channel rotary diverter 200 is used to establish a high-pressure fluid channel in the casing assembly 100.

[0061] Among them, a plurality of alloy drill bits 122 and high-pressure nozzles 123 are distributed around the bottom of the casing assembly 100. The alloy drill bits 122 include an outward-rotating alloy drill bit 122a distributed on the outer side of the casing wall of the casing assembly 100 and an inward-rotating alloy drill bit 122b distributed on the inner side of the casing wall of the casing assembly 100. The outward-rotating alloy drill bit 122a and the inward-rotating alloy drill bit 122b quickly cut the soil inside and outside the casing wall of the casing assembly 100 to form drilling slag during the high-speed rotation of the casing assembly 100. Figure 8 and Fig.10As shown, the externally rotating alloy drill bit 122a is responsible for cutting the soil outside the casing assembly 100, and the internally rotating alloy drill bit 122b is responsible for cutting the soil inside the casing assembly 100; the externally rotating alloy drill bit 122a and the internally rotating alloy drill bit 122b are preferably evenly distributed at the bottom of the casing to ensure uniform force when cutting the soil. Through the above-mentioned alloy drill bit 122 design, there is no soil adhesion between the casing and the pile body 500 to be pulled out, thereby ensuring the integrity of the pile body 500 to be pulled out, so that the pile body 500 to be pulled out is not damaged. The high-pressure nozzle 123 is connected to the outlet joint 207 of the multi-channel rotary diverter 200 through the high-pressure connecting pipe 104 arranged on the inner wall of the casing assembly 100, and the high-pressure fluid medium can be input through the multi-channel rotary diverter 200, wherein the spraying direction of the high-pressure nozzle 123 is toward the outer side and the inner side of the wall of the casing assembly 100 respectively, and the high-pressure jet generated by the high-pressure nozzle 123 can be used to rotate and cut the soil inside and outside the casing assembly 100, thereby improving the drilling efficiency; at the same time, through the high-speed rotary cutting of the alloy drill bit 122 and the rotary flushing and cutting of the high-pressure jet, the alloy drill bit 122 does not need to be embedded very deep into the soil, and thus the casing assembly 100 does not need to generate a large torque to cut the soil, so that when the casing assembly 100 rotates, a large torque will not be generated on the pile body 500 to be pulled out, thereby ensuring the integrity of the pile body 500 to be pulled out and preventing it from being damaged. The high-pressure nozzle 123 is connected to the high-pressure circulating fluid and the high-pressure gas through at least the multi-channel rotating diverter 200, and the high-pressure nozzle 123 forms internal and external high-pressure jets to cut the soil and bring the drill cuttings out of the hole. The high-pressure circulating fluid can cut the soil through the rotating high-pressure circulating fluid jet, and at the same time, it has a flushing effect on the alloy drill bit 122 to prevent the alloy drill bit 122 from getting stuck in the drill; the high-pressure gas can rotate and cut and disperse the soil at the bottom of the hole, and at the same time, the floating effect of the gas is used to ensure that the drill cuttings formed by the soil cut by the alloy drill bit 122 and the drill cuttings formed by the jet of the high-pressure circulating fluid cutting the soil do not settle at the bottom of the hole, and can carry the drill cuttings out of the hole efficiently, thereby improving the drilling efficiency; in addition, since the drill cuttings are discharged in time, there is less drill cuttings at the bottom of the hole, and the torque generated between the casing and the pile body 500 to be pulled out is small, thereby further ensuring the integrity of the pile body 500 to be pulled out and preventing damage to the pile body.

[0062] Reference Figures 8 to 11As shown, the bottom of the casing assembly 100 is also provided with a pile pulling mechanism, which has a retracted drilling state and an extended pile pulling state. When the casing assembly 100 is drilled and sunk, the pile pulling mechanism is in the retracted drilling state, so that the pile body 500 to be pulled out passes through the pile pulling mechanism and enters the casing assembly 100; when the casing assembly 100 drills to the bottom of the pile body 500 to be pulled out and pulls up, the pile body 500 to be pulled out is located inside the casing assembly 100, and the pile pulling mechanism switches to the extended pile pulling state, so that the pile pulling mechanism is buckled with the bottom of the pile body 500 to be pulled out together with the casing assembly 100. With the above-mentioned pile pulling mechanism, no auxiliary equipment such as a crane is required, and the casing assembly 100 can be used to protect the pile body and prevent the pile body from being damaged.

[0063] The fully recyclable silent rotary pile puller of the present embodiment uses a high-speed hydraulic power head 300 to drive the casing assembly 100 to rotate at high speed, and cooperates with the alloy drill bit 122 and the high-pressure nozzle 123 at the bottom of the casing assembly 100 to use a high-pressure jet to cut the soil and bring the drill residue out of the hole when quickly cutting the soil. At the same time, the internal and external alloy drill bits and the high-pressure nozzle design can not only cut the soil outside the casing, but also cut the soil between the casing and the pile body 500 to be pulled out, so that there is no soil adhesion between the casing and the pile body 500 to be pulled out. The torque generated by casing drilling on the pile body 500 to be pulled out is reduced, and the pile pulling mechanism at the bottom of the casing can be used to lift and pull out the pile from the bottom of the pile body to be pulled out, thereby ensuring the integrity of the pile body to be pulled out, avoiding damage to the pile body, and achieving the purpose of non-destructive recovery of old piles; and the high-pressure jet can flush the alloy drill bit and quickly remove the drill cuttings, greatly improving the drilling efficiency and depth, and greatly improving the efficiency of pile pulling construction; at the same time, the rotary pile pulling construction has low noise, good environmental protection, deep construction depth, strong adaptability, simple operation and low cost.

[0064] Furthermore, if Figure 1 and Figure 2 As shown, in this embodiment, a spiral blade 101 for discharging drill cuttings is further provided on the outer wall of the casing assembly 100. With the high-speed rotation of the casing, the lifting effect of the spiral blade 101 can help to quickly carry the drill cuttings out of the hole, thereby preventing the drill cuttings from settling at the bottom of the hole and affecting the drilling efficiency. In addition, an auxiliary cutting alloy blade is selectively provided at a section of the spiral blade 101 near the bottom of the casing assembly 100, which can assist in cutting the soil outside the casing, further improving the efficiency of the drilling rig.

[0065] catch Figures 8 to 11As shown, in this embodiment, the pile pulling mechanism includes at least two groups of self-limiting baffles 125 evenly distributed at the bottom of the casing assembly 100. The self-limiting baffles 125 are installed at the bottom of the casing assembly 100 by rotating the mounting seat 124. The self-limiting baffles 125 can flip and move in the radial direction. When the casing assembly 100 is drilled and sunk, the self-limiting baffles 125 are subjected to resistance and flip upward and shrink at the inner pipe wall of the casing assembly 100, so that the pile body 500 to be pulled out can pass normally; when the casing assembly 100 drills into the pile bottom of the pile body 500 to be pulled out and pulls up, under the action of the upward pulling action and the self-weight of the self-limiting baffles 125, the self-limiting baffles 125 flip toward the center of the casing assembly 100 and are limited at a horizontal position. At this time, the distance between the self-limiting baffles 125 is smaller than the size of the pile body 500 to be pulled out, so the pile body 500 to be pulled out can be supported from the bottom and pulled out together with the upward pulling of the casing assembly 100. The above-mentioned pile pulling mechanism has a simple and compact structure, does not require auxiliary equipment such as a crane, has little damage to the pile body during the pile pulling process, and is convenient and quick to pull the pile. Of course, the pile pulling mechanism is not limited to this, and other structures with similar functions can also be used, such as controlling the pile pulling mechanism to unfold during the pull-up by a mechanical structure, etc. A feasible design here is that several flap holes can be evenly opened at the bottom side wall of the casing assembly 100, and a flap is hinged on one side of each flap hole, and the hinge axis of the flap is arranged along the casing generatrix, and the hinge axis is located at the front side of the casing rotation direction, so that during the casing rotation drilling process, each flap is kept in the flap hole by the resistance, and at the same time, a nozzle facing the flap is arranged on the outside of the flap hole, and after the casing assembly 100 is drilled into the pile bottom of the pile body 500 to be pulled, the high-pressure jet is sprayed by the nozzle to make the flap flip inward, and the flipped flap is located at the bottom of the pile body 500 to be pulled, which plays a role in lifting the pile body 500 to be pulled. A similar variation may also include a torsion spring disposed at the hinge axis of the flap, so that the flap has a tendency to flip inward. During the rotary drilling of the casing, each flap is subjected to resistance to overcome the elastic force of the torsion spring and remains in the flap hole. When the casing assembly 100 is drilled to the bottom of the pile body 500 to be pulled out, the casing assembly 100 is rotated in the reverse direction. At this time, the flap can also flip inward under the combined action of the torsion spring and the reverse resistance and be located at the bottom of the pile body 500 to be pulled out.

[0066] The fully recyclable silent rotary pile puller of this embodiment can adopt an integrated casing assembly 100 structure for shallow piles, which can be used for efficient drilling and pile pulling construction; for deep piles, due to the height limit of the drilling rig, it is preferred to adopt a multi-section assembled casing design. In order to meet the requirements for pulling out old piles of different pile depths, in this embodiment, the casing assembly 100 at least includes a connecting steel sleeve 110 and a drilling steel sleeve 120, such as Figure 1 and Figure 2The two-section casing structure is shown, and a sleeve upper joint 111 for connecting to the multi-channel rotary diverter 200 is provided at the upper end of the connecting steel sleeve 110. The sleeve upper joint 111 can be welded to the connecting steel sleeve 110, and the upper end of the sleeve upper joint 111 is connected to the multi-channel rotary diverter 200 by a flange structure. The lower end of the connecting steel sleeve 110 is provided with a sleeve male joint 102, and the upper end of the drilling steel sleeve 120 is provided with a sleeve female joint 103 that matches the sleeve male joint 102. The sleeve male joint 102 can be inserted into the sleeve female joint 103 and fixedly connected by a circumferentially arranged connecting pin 105 (such as Figure 5 As shown in FIG. 1 , a drilling ring 121 is fixedly disposed at the lower end of the drilling steel sleeve 120, and the drilling ring 121 can be welded to the drilling steel sleeve 120. The alloy drill bit 122 and the pile pulling mechanism are respectively mounted on the drilling ring 121. When a casing structure with more than two sections is adopted, the casing assembly 100 further includes a plurality of intermediate steel sleeves 130 disposed between the connecting steel sleeve 110 and the drilling steel sleeve 120. Figure 6 and Figure 7 As shown, the connection structure between the connecting-section steel sleeve 110 and the drilling-section steel sleeve 120 is the same, a sleeve female joint 103 is provided at the upper end of the intermediate-section steel sleeve 130, and a sleeve male joint 102 is provided at the lower end. The sleeve female joint 103 at the upper end of the intermediate-section steel sleeve 130 can be plugged into the sleeve male joint 102 at the lower end of the upper adjacent intermediate-section steel sleeve 130 or the sleeve male joint 102 at the lower end of the connecting-section steel sleeve 110 and fixedly connected by a circumferentially arranged connecting pin 105; the sleeve male joint 102 at the lower end of the intermediate-section steel sleeve 130 can be plugged into the sleeve female joint 103 at the upper end of the lower adjacent intermediate-section steel sleeve 130 or the sleeve female joint 103 at the upper end of the drilling-section steel sleeve 120 and fixedly connected by a circumferentially arranged connecting pin 105. The above-mentioned multi-section casing design can meet the needs of pile extraction at different depths, especially can achieve non-destructive extraction of very deep piles; and the connection between steel sleeves is convenient, firm and reliable. In order to improve the strength of the steel sleeve, it is preferred to adopt a double-walled steel sleeve structure, that is, the steel sleeve is composed of two layers of inner and outer steel casings, and the inner and outer steel casings are fixedly connected together in sequence through a number of connecting rings. Due to the high structural strength of the double-walled steel sleeve and the fact that it can be assembled and used in multiple sections, the drilling depth is greatly increased, and in theory, it can be constructed to more than 100m.

[0067] In this embodiment, the multi-channel rotary flow divider 200 is a rotatable connector that can be connected to a high-pressure fluid and establish a fluid delivery channel. Figure 4As shown, the above-mentioned multi-channel rotary diverter 200 includes a rotating seat 201 and a diverter seat 202, the rotating seat 201 is connected to the diverter seat 202 for relative rotation, more than two annular grooves 203 and a plurality of seals 204 are provided between the rotating seat 201 and the diverter seat 202, a diverter channel 205 connected to the corresponding annular groove 203 is provided in the rotating seat 201, and each diverter channel 205 has an outlet joint 207 at the lower end, and an inlet joint 206 connected to the corresponding annular groove 203 is provided on the diverter seat 202. The annular groove 203 realizes the communication between the inlet joint 206 and the corresponding diverter channel 205, and the seal 204 realizes the sealing between the rotating seat 201 and the diverter seat 202 and the sealing between each annular groove 203, so that different high-pressure fluids, such as high-pressure gas and high-pressure circulating fluid, can be connected to different diverter channels 205. When in use, the upper end of the rotating seat 201 is connected to the driving end of the high-speed hydraulic power head 300 by a flange structure, the lower end of the rotating seat 201 is connected to the upper joint 111 of the sleeve by a flange structure, and the inlet joint 206 on the diverter seat 202 is connected to the corresponding external high-pressure fluid and can be fixed. During the rotation of the rotating seat 201, the annular groove 203 can maintain the effective connection between the inlet joint 206 and the corresponding diverter channel 205. The above-mentioned multi-channel rotating diverter 200 can realize the establishment of multiple channels, so that the high-pressure nozzle 123 can cut the soil body with high pressure jet while rotating, thereby improving the casing drilling efficiency; and the multi-channel design can be connected to high-pressure circulating fluid and high-pressure gas respectively, and the high-pressure gas is used to prevent the drill residue formed by the soil body cut by the alloy drill bit and the drill residue formed by the jet cutting of the high-pressure circulating fluid from settling at the bottom of the hole, and the drill residue is carried and efficiently discharged out of the hole, which can improve the drilling efficiency on the one hand, and reduce the torque generated between the casing and the pile body to be pulled out on the other hand, thereby protecting the pile body to be pulled out from damage.

[0068] The fully recyclable silent rotary pile puller of this embodiment adopts an angle-adjustable design for the alloy drill bit 122, which can be adjusted in angle according to the geological survey report and the parameters of the pile to be pulled. Fig.12As shown, the alloy drill bit 122 includes a drill rod 122-1 and an alloy cutting tooth 122-2 embedded in the lower end of the drill rod 122-1. The upper end of the drill rod 122-1 has an adjustable angle plug-in portion 122-3. The adjustable angle plug-in portion 122-3 can be plugged and installed on the bottom surface of the drilling ring 121 and fixed by a locking nut 122-4. The alloy cutting tooth 122-2 is eccentrically arranged between the adjustable angle plug-in portion 122-3. The position of the alloy cutting tooth 122-2 is adjusted by the plug-in angle of the adjustable angle plug-in portion 122-3 on the bottom surface of the drilling ring 121. Specifically, the drill bit rod 122-1 can be designed as a V-shaped structure with an angle greater than 90°, and the adjustable angle plug-in portion 122-3 adopts an external spline structure, and correspondingly, an internal spline hole is provided on the bottom surface of the drilling ring 121. During installation, the position of the alloy cutting tooth 122-2 can be adjusted according to the insertion angle of the internal and external splines. This makes it convenient to adjust the angle and position of the outward-rotating alloy drill bit 122a and the inward-rotating alloy drill bit 122b. For example, the number of the outward-rotating alloy drill bit 122a and the inward-rotating alloy drill bit 122b can be changed so that the number of the outward-rotating alloy drill bit 122a is greater than the number of the inward-rotating alloy drill bit 122b.

[0069] Reference Figure 3 and Fig.13 As shown, in this embodiment, the high-pressure nozzle 123 extends to the bottom of the drilling section steel sleeve 120 through the high-pressure connecting pipe 104. The high-pressure nozzle 123 has a two-way nozzle in an inverted "V" shape. The spray direction of one nozzle is toward the outer wall of the casing assembly 100, and the spray direction of the other nozzle is toward the inner wall of the casing assembly 100. The high-pressure connecting pipe 104 is a high-pressure pipeline fixed on the inner wall of the casing. When multiple sections are assembled, the high-pressure connecting pipes 104 in each section of the casing are connected at the same time. The "V"-shaped two-way nozzle design can take into account the high-pressure jet spraying inside and outside the casing, quickly cut and disintegrate the soil inside and outside the casing, and has a simple structure and is easy to manufacture and install.

[0070] Reference Figures 1 to 3 As shown, for hard formations, the fully-recoverable silent rotary pile puller of this embodiment is also provided with a hydraulic vibrator 400 at the upper end of its high-speed hydraulic power head 300, and the hydraulic vibrator 400 can vibrate the casing at a high frequency, so that the alloy drill bit at the bottom of the casing can impact the hard formation while rotating, thereby improving the drilling efficiency of the hard formation. The above-mentioned high-speed hydraulic power head 300 and hydraulic vibrator 400 are both commonly used power devices in engineering machinery, and will not be described in detail here.

[0071] This embodiment also discloses a pile pulling construction equipment. Figures 14 to 16As shown, the pile pulling construction equipment includes a drilling machine 600 and the above-mentioned fully recoverable silent rotary pile puller. The drilling machine 600 includes a traveling chassis 601 and a lifting mast 603 installed on the traveling chassis 601. A clamp 604 is provided on the lifting mast 603. The lifting mast 603 can drive the clamp 604 to move up and down. The high-speed hydraulic power head 300 of the fully recoverable silent rotary pile puller is fixedly installed on the clamp 604. The lifting mast 603 can drive the fully recoverable silent rotary pile puller to drill and pull up. With the pile pulling construction equipment, the casing can be drilled and pulled out by using the lifting mast 603. The equipment is simple and the investment cost is low. Compared with the existing pile pulling process, the number of piles pulled per day can reach more than 10, and the pile pulling efficiency is greatly improved.

[0072] In the above-mentioned drilling rig 600, the traveling chassis 601 preferably adopts a crawler structure, and a cab 602, a drilling rig hydraulic pump group 605, a control cabinet and other devices are also provided on the traveling chassis 601. The traveling chassis 601 and the lifting mast 603 can be driven by the hydraulic system of the drilling rig hydraulic pump group 605. As for other structures and working principles of the drilling rig 600, they are similar to those in the prior art, so they will not be described in detail here.

[0073] A pile pulling construction equipment of this embodiment has the following construction process:

[0074] Step 1: First clear the foundation of the platform above the pile top;

[0075] Step 2: Install each device and configure the circulating fluid;

[0076] Step 3: Start the high-speed hydraulic power head 300 and the backstage high-pressure mud pump and high-pressure compressor to deliver the high-pressure flushing circulating fluid and high-pressure gas to the bottom of the drill bit through the multi-channel rotary diverter 200;

[0077] Step 4: While rotating the installed drilling tool, high-pressure flushing circulating fluid and high-pressure gas are sprayed to cut and crush the soil around the pile body 500 to be pulled out, and carry it out of the hole to form an annular cut hole; the hole is filled with flushing circulating fluid and the flushing circulating fluid protects the hole wall from collapse;

[0078] Step 5: Rotate and drill into a position about 1m below the pile bottom, and then the self-limiting baffle 125 falls;

[0079] Step 6: Lift the entire set of drilling tools to move the pile body 500 to the outside of the hole;

[0080] Step 7: Check the pile body 500 to be extracted and determine if it meets the quality requirements and can be reused.

[0081] In summary, the fully recyclable silent rotary pile puller and pile pulling construction equipment of the present invention can solve the following technical problems existing in the existing pile pulling process:

[0082] Problem 1: Most of the removed piles are damaged and cannot be reused;

[0083] Problem 2: The full-rotation CRD method for pile extraction requires large equipment investment and low construction efficiency;

[0084] Question 3: Vibratory pile pulling is limited by the power of the vibration machine and its depth. It is also easy to damage old piles, making them unusable and noisy.

[0085] In view of the above problems, the present invention utilizes a high-speed hydraulic power head to drive the casing assembly to rotate at high speed, and cooperates with the alloy drill bit and high-pressure nozzle at the bottom of the casing assembly to use high-pressure jet to cut the soil and bring the drill cuttings out of the hole when quickly cutting the soil. At the same time, the inner and outer alloy drill bits and high-pressure nozzle design can not only cut the soil outside the casing, but also cut the soil between the casing and the pile body to be pulled out, so that there is no soil adhesion between the casing and the pile body to be pulled out, reducing the torque generated by the casing drilling on the pile body to be pulled out, and cooperating with the pile pulling mechanism at the bottom of the casing, the pile can be lifted and pulled out from the bottom of the pile body to be pulled out, thereby ensuring the integrity of the pile body to be pulled out, avoiding damage to the pile body, and achieving the purpose of lossless recovery of old piles.

[0086] With the multi-channel rotary diverter, the high-pressure circulating fluid can rotate and use the bidirectional high-speed nozzle to quickly cut the soil inside and outside the casing. The high-pressure rotatable circulating fluid jet cuts the soil and flushes the soil bonded to the alloy drill bit, so that the drill bit does not get stuck and ensures drilling efficiency. In addition, the high-pressure gas is input through the multi-channel rotary diverter. On the one hand, the high-pressure compressed gas can rotate and cut and disperse the soil at the bottom of the hole. On the other hand, it ensures that the drill slag formed by the soil cut by the alloy drill bit and the drill slag formed by the high-pressure circulating fluid jet cutting the soil will not settle at the bottom of the hole, affecting the drilling efficiency. At the same time, the drill slag can be carried out of the hole efficiently. At the same time, because the drill slag is discharged in time, there is less drill slag at the bottom of the hole, and the torque generated between the steel casing and the pile to be pulled out is small, thereby effectively ensuring the integrity of the pile to be pulled out and not being damaged.

[0087] In addition, the lifting effect of the spiral blades can help to quickly carry the drill cuttings out of the hole to prevent the drill cuttings from settling at the bottom of the hole and affecting the drilling efficiency; a section of the spiral blade near the bottom of the casing assembly is also selectively provided with an auxiliary cutting alloy blade to assist in cutting the soil outside the casing, further improving the efficiency of the drilling rig.

[0088] The present invention and its embodiments are described schematically above, which is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired by it and creatively designs a structure and an embodiment similar to the technical solution without departing from the purpose of the invention, they shall all fall within the protection scope of the present invention.

Claims

1. A fully recyclable silent rotary pile puller, characterized in that: The invention comprises a casing assembly (100), a multi-channel rotary flow divider (200) and a high-speed hydraulic power head (300), wherein the high-speed hydraulic power head (300) is coaxially connected to the casing assembly (100) via the multi-channel rotary flow divider (200) and is used to drive the casing assembly (100) to rotate at high speed to cut soil; wherein: A plurality of alloy drill bits (122) and high-pressure nozzles (123) are distributed around the bottom of the casing assembly (100). The alloy drill bits (122) include an outwardly rotating alloy drill bit (122a) distributed on the outside of the casing wall of the casing assembly (100) and an inwardly rotating alloy drill bit (122b) distributed on the inside of the casing wall of the casing assembly (100). The outwardly rotating alloy drill bit (122a) and the inwardly rotating alloy drill bit (122b) quickly cut the soil inside and outside the casing wall of the casing assembly (100) during the high-speed rotation of the casing assembly (100) to form a drill hole. The high-pressure nozzle (123) is connected to the outlet joint (207) of the multi-channel rotary diverter (200) through a high-pressure connecting pipe (104) provided on the inner wall of the casing assembly (100), and the spraying direction of the high-pressure nozzle (123) is respectively toward the outer side and the inner side of the wall of the casing assembly (100); the high-pressure nozzle (123) is externally connected to high-pressure circulating fluid and high-pressure gas through at least the multi-channel rotary diverter (200), and the high-pressure nozzle (123) forms internal and external high-pressure jets to cut the soil and bring the drilling slag out of the hole; The bottom of the casing assembly (100) is also provided with a pile pulling mechanism, which has a retracted drilling state and an extended pile pulling state. When the casing assembly (100) is drilled and sunk, the pile pulling mechanism is in the retracted drilling state, so that the pile body (500) to be pulled out passes through the pile pulling mechanism and enters the casing assembly (100); when the casing assembly (100) drills to the bottom of the pile body (500) to be pulled out and pulls up, the pile pulling mechanism switches to the extended pile pulling state, so that the pile pulling mechanism is buckled with the bottom of the pile body (500) to be pulled out together with the casing assembly (100).

2. The fully recyclable silent rotary pile puller according to claim 1, characterized in that: The outer wall of the casing assembly (100) is also provided with a spiral blade (101) for discharging drilling cuttings; a section of the spiral blade (101) close to the bottom of the casing assembly (100) is also selectively provided with an auxiliary cutting alloy blade.

3. The fully recoverable silent rotary pile puller according to claim 1, characterized in that: The pile pulling mechanism comprises at least two groups of self-limiting baffles (125) evenly distributed at the bottom of the casing assembly (100); the self-limiting baffles (125) are mounted at the bottom of the casing assembly (100) via a rotating mounting seat (124); the self-limiting baffles (125) can flip and move in the radial direction; when the casing assembly (100) is drilled and sunk, the self-limiting baffles (125) flip upward and shrink at the inner pipe wall of the casing assembly (100); when the casing assembly (100) is drilled to the bottom of the pile body (500) to be pulled out and pulled up, the self-limiting baffles (125) flip toward the center of the casing assembly (100) and are limited at a horizontal position.

4. The fully recoverable silent rotary pile puller according to claim 1, 2 or 3, characterized in that: The casing assembly (100) comprises at least a connecting steel sleeve (110) and a drilling steel sleeve (120). The upper end of the connecting steel sleeve (110) is provided with a sleeve upper joint (111) for connecting to a multi-channel rotary diverter (200). The lower end of the connecting steel sleeve (110) is provided with a sleeve male joint (102). The upper end of the drilling steel sleeve (120) is provided with a sleeve female joint (103) adapted to the sleeve male joint (102). The sleeve male joint (102) can be plugged into the sleeve female joint (103) and fixedly connected by a circumferentially arranged connecting pin (105). The lower end of the drilling steel sleeve (120) is fixedly provided with a drilling ring (121). The alloy drill bit (122) and the pile pulling mechanism are respectively mounted on the drilling ring (121).

5. The fully recoverable silent rotary pile puller according to claim 4 is characterized in that: The casing assembly (100) further comprises a plurality of intermediate steel sleeves (130) arranged between the connecting steel sleeve (110) and the drilling steel sleeve (120), wherein the upper end of the intermediate steel sleeve (130) is provided with a sleeve female joint (103), and the lower end is provided with a sleeve male joint (102), and the sleeve female joint (103) at the upper end of the intermediate steel sleeve (130) can be connected with the sleeve male joint (102) at the lower end of the upper adjacent intermediate steel sleeve (130). ) or the sleeve male joint (102) at the lower end of the connecting steel sleeve (110) is plugged in and fixedly connected by a circumferentially arranged connecting pin (105); the sleeve male joint (102) at the lower end of the intermediate steel sleeve (130) can be plugged in and fixedly connected with the sleeve female joint (103) at the upper end of the intermediate steel sleeve (130) adjacent to the lower end or the sleeve female joint (103) at the upper end of the drilling steel sleeve (120) by a circumferentially arranged connecting pin (105).

6. The fully recoverable silent rotary pile puller according to claim 4, characterized in that: The multi-channel rotary flow divider (200) comprises a rotating seat (201) and a flow divider seat (202); the rotating seat (201) is connected to the flow divider seat (202) in a relatively rotatable manner; two or more annular grooves (203) and a plurality of sealing members (204) are provided between the rotating seat (201) and the flow divider seat (202); a flow divider channel (205) connected to the corresponding annular groove (203) is provided in the rotating seat (201); the lower end of each of the flow divider channels (205) has an outlet connector (207); and the flow divider seat (202) is provided with an inlet connector (206) connected to the corresponding annular groove (203).

7. The fully recoverable silent rotary pile puller according to claim 4, characterized in that: The alloy drill bit (122) comprises a drill rod (122-1) and an alloy cutting tooth (122-2) embedded in the lower end of the drill rod (122-1); the upper end of the drill rod (122-1) is provided with an adjustable angle plug-in portion (122-3); the adjustable angle plug-in portion (122-3) can be plugged and installed on the bottom surface of a drilling ring (121) and fixed by a locking nut (122-4); the alloy cutting tooth (122-2) is eccentrically arranged with the adjustable angle plug-in portion (122-3); and the position of the alloy cutting tooth (122-2) is adjusted by the plugging angle of the adjustable angle plug-in portion (122-3) on the bottom surface of the drilling ring (121).

8. The fully recoverable silent rotary pile puller according to claim 4, characterized in that: The high-pressure nozzle (123) extends to the bottom of the drilling section steel sleeve (120) through the high-pressure connecting pipe (104), and the high-pressure nozzle (123) has a bidirectional nozzle in an inverted "V" shape, wherein the spray direction of one nozzle is toward the outer side of the barrel wall of the casing assembly (100), and the spray direction of the other nozzle is toward the inner side of the barrel wall of the casing assembly (100).

9. The fully recoverable silent rotary pile puller according to claim 1, characterized in that: A hydraulic vibrator (400) is also provided at the upper end of the high-speed hydraulic power head (300).

10. A pile extraction construction equipment, characterized in that: The invention comprises a drilling rig (600) and a fully-recoverable silent rotary pile puller as claimed in any one of claims 1 to 9, wherein the drilling rig (600) comprises a traveling chassis (601) and a lifting mast (603) mounted on the traveling chassis (601), a clamp (604) being provided on the lifting mast (603), and a high-speed hydraulic power head (300) of the fully-recoverable silent rotary pile puller being fixedly mounted on the clamp (604).

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