Full-recovery mute environment-friendly rotary pile pulling construction method and construction equipment

Abstract

The invention discloses a full-recovery mute environment-friendly rotary pile pulling construction method and construction equipment, and belongs to the technical field of engineering construction. The full-recovery mute environment-friendly rotary pile pulling construction equipment comprises a drilling machine, a high-pressure pump set, an air compressor and a rotary pile pulling device, and the rotary pile pulling device comprises a pile casing assembly, a multi-channel rotary flow divider and a high-rotating-speed hydraulic power head. The high-rotating-speed hydraulic power head is used for driving the pile casing assembly to rotate at a high speed, high-pressure circulating liquid and high-pressure gas are input in combination with the internal and external rotating alloy drill bits at the bottom of the pile casing and the high-pressure spray head, no soil body bonding exists between the pile casing and a to-be-pulled pile body, and torque generated by drilling of the pile casing to the to-be-pulled pile body is reduced; a pile to be pulled can be lifted from the bottom of the pile body to be pulled, so that the pile body is prevented from being damaged, and the purpose of lossless recovery of old piles is achieved; meanwhile, 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 present invention relates to a pile foundation demolition construction equipment and construction method, and more specifically, to a fully recycled, silent, environmentally friendly rotary pile pulling construction method and construction equipment. Background Art

[0002] In the rapid advancement of urbanization and the continuous renewal of infrastructure construction, the demolition of old buildings and site renovation projects are increasing. In these projects, pulling out old piles is a key and complex construction task. The existence of old piles not only hinders the construction of new buildings but also may pose potential threats to the surrounding environment and underground facilities. The optimization of pile pulling construction methods can not only improve construction efficiency, reduce construction costs, but also effectively reduce the impact on the environment and ensure the safety and health of construction workers and surrounding residents. Therefore, developing an efficient, environmentally friendly, safe, and silent pile pulling construction method and construction equipment has important practical significance.

[0003] Existing pile pulling construction methods mainly include manual pile pulling, hydraulic pile puller pile pulling, vibration pile pulling, and full rotary CRD method pile pulling, etc., among which:

[0004] (1) Manual pile pulling: Manual pile pulling mainly relies on human power to apply a pulling force to the pile through simple mechanical devices (such as levers, pulley blocks, etc.) to pull it out. This method was more common in early building demolitions, especially in some small projects or when the pile body was relatively shallow.

[0005] The main disadvantages are as follows:

[0006] 1. High labor intensity: Manual pile pulling requires a large amount of manpower, with extremely high labor intensity and low work efficiency. For example, for a relatively deep concrete pile, it may take many people to work continuously for several hours or even days to pull it out.

[0007] 2. High safety risk: Since the operator directly participates in the pile pulling process, it is easy to be accidentally injured. For example, during the pile pulling process, the pile body may suddenly break or tilt, causing injury to personnel.

[0008] 3. Limited application range: For relatively deep or thick pile bodies, manual pile pulling is often difficult to achieve and cannot guarantee the pile pulling quality.

[0009] 4. Serious damage to the pile body: During the manual pile pulling process, due to low operation accuracy, 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, when manually pulling piles, due to uneven force application, the pile body often breaks, resulting in material waste.

[0010] (2) Pile extraction using a hydraulic pile extractor: The hydraulic pile extractor drives the pile gripper to clamp the pile body through a hydraulic system, and then uses the lifting force of the hydraulic cylinder to extract the pile section by section. This equipment is commonly used in some medium-scale projects.

[0011] Its main disadvantages are as follows:

[0012] 1. Complex equipment: Hydraulic pile extractors usually require large frames and complex hydraulic systems. The equipment is large in size and inconvenient to move. For example, in some narrow construction sites, it is difficult for hydraulic pile extractors to enter.

[0013] 2. High energy consumption: The hydraulic system needs to continuously supply high-pressure oil, resulting in high energy consumption. At the same time, the leakage of hydraulic oil may also cause environmental pollution.

[0014] 3. Limited pile extraction efficiency: Although the pile extraction force of the hydraulic pile extractor is relatively large, due to the need to extract the pile section by section, the pile extraction efficiency is still not high. For example, for a long pile, it may be necessary to lift it several times to completely extract it.

[0015] 4. Serious damage to the pile body: The pile gripper of the hydraulic pile extractor may cause damage to the surface of the pile body during the clamping process, further reducing the reuse value of the pile body. For example, excessive clamping force of the pile gripper may cause cracks or local damage on the surface of the pile body.

[0016] (3) Vibration pile extraction: The vibration pile extractor uses the vibration principle to apply high-frequency vibration to the pile body through a vibratory hammer, loosening the soil around the pile body, thereby reducing the pile extraction resistance. This method is relatively common in some large-scale projects.

[0017] Its main disadvantages are as follows:

[0018] 1. Serious noise pollution: The vibration pile extractor generates high-intensity noise during operation, causing serious impacts on the surrounding environment and residents' lives. For example, in some projects near schools, hospitals or residential areas, the noise of the vibration pile extractor may cause complaints from residents.

[0019] 2. Fast equipment wear: During the high-frequency vibration process of the vibratory hammer, the equipment wears relatively seriously, resulting in high maintenance costs. At the same time, the vibration may also cause damage to surrounding underground facilities (such as pipelines, cables, etc.).

[0020] 3. Serious damage to the pile body: The high-frequency vibration generated by the vibration pile extractor during operation not only causes noise pollution to the surrounding environment, but also easily leads to damage to the internal structure of the pile body. For example, for some old concrete piles, the vibration may reduce the bond strength between the steel bars and the concrete inside the pile body, resulting in the pile body being unable to be reused after extraction.

[0021] 4. Limited scope of application: Vibro extractors have relatively high requirements for geological conditions. For some hard soil layers or rock layers, the vibration effect is not good, and it may even be impossible to extract the pile.

[0022] (IV) Pile extraction using the full-rotation CRD method: The full-rotation CRD method (Cross Rotation Drilling) is a relatively advanced pile extraction technology. The soil around the pile is cut by a rotary drilling rig, and then the pile is extracted using a hydraulic system.

[0023] Its main disadvantages are as follows:

[0024] 1. High equipment cost: This method requires the use of specialized full-rotation drilling rigs and supporting hydraulic equipment, resulting in high equipment costs. For example, the price of a full-rotation drilling rig is usually in the millions of yuan, which is a huge investment for some small construction units.

[0025] 2. Low construction efficiency: Although the full-rotation CRD method can extract the pile relatively completely, due to the need for cutting operations around the pile, the construction time is long. For example, for a relatively deep pile, it may take several hours or even several days to complete the pile extraction operation, resulting in low construction efficiency.

[0026] 3. Complex operation: The operation of the full-rotation CRD method is relatively complex and requires professional technical personnel for operation and maintenance. At the same time, the commissioning and maintenance of the equipment also require a large amount of time and effort, further increasing the construction cost.

[0027] 4. Serious pile damage: Although the full-rotation CRD method can extract the pile relatively completely, the pile may still be damaged to a certain extent during the cutting process, reducing its reuse value.

[0028] In the prior art, there is also a pile extraction construction method that rotates a steel sleeve to cut the soil while spraying high-pressure water. For example, the "Method for Extracting Existing Piles" disclosed in Japanese Patent Publication No. JPH06116955A (the patent publication date is April 26, 1994) and the "Method and Construction Equipment for Clearing Obstacles and Extracting Piles with Full Rotation and Fast Cutting" disclosed in Chinese Patent Publication No. CN101358452A (the patent publication date is February 4, 2009), etc. They are provided with cutting blades and high-pressure nozzles at the lower end of the steel sleeve. During construction, while rotating the steel sleeve, high-pressure water is sprayed from the nozzles to reduce the friction between the steel sleeve and the ground. This pile extraction process can improve the soil cutting efficiency through high-pressure water, which helps to improve the construction efficiency, and there is basically no vibration and noise during the construction process. However, the above technical solutions only consider the friction between the steel sleeve and the soil. Since there is also soil adhesion between the steel sleeve and the pile to be extracted, during the process of the steel sleeve rotating and drilling into the soil, a large torsional force will be generated on the pile to be extracted, which is likely to cause damage to the pile body; during the process of extracting the old pile, the steel wire rope is mainly used to lift the pile body, and the pile body is easily subjected to large shear force and tensile force during the lifting process, which is also likely to cause damage to the pile body. Moreover, due to the difficulty of discharging the drilling slag during the construction process, the actual drilling efficiency is still relatively low, especially for deeper piles, and the construction time is still relatively long.

[0029] In addition, in the prior art, there are also processes for constructing steel sleeves by means of vibration and static pressure, etc. However, the construction efficiency of vibration and static pressure is relatively low, and for deeper piles, the pile extraction construction period is relatively long; although some steel sleeves are provided with pile extraction hook structures at their bottoms, these pile extraction hooks are in a contracted state during the downward pressing process of the sleeve, and can open and hook the bottom of the pile body during the upward pulling process of the sleeve and be pulled out together with the sleeve, thereby reducing the damage to the pile body. However, during the downward pressing process of the steel sleeve, the vibration and static pressure are easily transmitted to the pile body through the soil, thereby causing damage to the pile body.

[0030] In summary, most of the existing pile extraction construction equipment and construction methods have damage to old piles during the construction process, and the recycling of old piles cannot be realized; moreover, the overall construction efficiency is not high, especially for piles with relatively large depths and diameters, the pile extraction construction time is relatively long or even the pile extraction fails. Summary of the Invention

[0031] 1. Technical Problems to be Solved by the Invention

[0032] The purpose of the present invention is to overcome the shortcomings of existing pile extraction construction equipment and construction methods, such as the damage to old piles during the construction process, the inability to recycle the old piles, and the low overall construction efficiency, and to provide a fully recyclable, silent, and environmentally friendly rotary pile extraction construction method and construction equipment. The technical scheme of the present invention is adopted to drive the casing assembly to rotate at high speed using a high-speed hydraulic power head, and to cut the soil on both sides of the inner and outer sides of the casing wall through a plurality of internal and external rotating alloy drill bits at the bottom of the casing. At the same time, a high-pressure pump group and an air compressor are used to input high-pressure circulating fluid and high-pressure gas to the high-pressure nozzle at the bottom of the casing to form a high-pressure jet cutting soil on both sides of the inner and outer sides of the casing wall. The casing can remove the drill slag and bring it out of the hole, so that there is no soil adhesion between the casing and the pile body to be pulled out, reducing the torque of 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; the high-pressure circulating liquid jet and the high-pressure gas jet can wash the alloy drill bit and quickly remove the drill slag, greatly improving the drilling efficiency and depth, and improving the efficiency of pile pulling construction; at the same time, it also has the advantages of low construction noise, good environmental protection, deep construction depth, strong adaptability, simple operation and low cost.

[0033] 2. Technical solution

[0034] In order to achieve the above object, the technical solution provided by the present invention is:

[0035] A fully recyclable, silent and environmentally friendly rotary pile pulling construction equipment of the present invention comprises a drilling rig, a high-pressure pump group, an air compressor and a rotary pile puller, wherein the rotary pile puller comprises a casing assembly, a multi-channel rotary diverter and a high-speed hydraulic power head, wherein the high-speed hydraulic power head is installed on the lifting mast of the drilling rig through a clamp, and the high-speed hydraulic power head is coaxially connected with the casing assembly through the multi-channel rotary diverter;

[0036] 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 assembly wall and an inward-rotating alloy drill bit distributed on the inner side of the casing assembly wall; the high-pressure nozzle is connected to the outlet joint corresponding to 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 pump group and the air compressor are respectively connected to the corresponding high-pressure nozzle through the multi-channel rotary diverter, and the high-pressure circulating liquid jet and the high-pressure gas jet are formed through the high-pressure nozzle to cut the soil and bring the drill cuttings out of the hole;

[0037] The bottom of the casing assembly is provided with a pile pulling mechanism, which has a retracted drilling state and an extended pile pulling state. When the casing assembly rotates and drills down, the pile pulling mechanism is in the retracted drilling state to enable the pile to be pulled to pass through the pile pulling mechanism and enter the casing assembly; when the casing assembly drills to the bottom of the pile to be pulled and is pulled upward, the pile pulling mechanism switches to the extended pile pulling state to enable the pile pulling mechanism to be buckled with the bottom of the pile to be pulled and be pulled out together with the casing assembly.

[0038] Furthermore, the casing assembly includes a connecting section steel casing, a drilling section steel casing and intermediate section steel casings. A number of intermediate section steel casings are provided between the connecting section steel casing and the drilling section steel casing according to the pile pulling construction depth; among them:

[0039] The upper end of the connecting section steel casing is provided with a casing upper joint for connecting with a multi-channel rotary diverter, and the lower end of the connecting section steel casing is provided with a casing male joint;

[0040] The upper end of the drilling section steel casing is provided with a casing female joint, and the lower end of the drilling section steel casing is fixedly provided with a drilling ring, and the alloy drill bit is installed on the drilling ring;

[0041] The upper end of the intermediate section steel casing is provided with a casing female joint that matches the casing male joint of the above-mentioned connecting section steel casing, and the lower end of the intermediate section steel casing is provided with a casing male joint that matches the casing female joint of the above-mentioned drilling section steel casing;

[0042] The casing female joint at the upper end of the intermediate section steel casing can be inserted and fixedly connected with the casing male joint at the lower end of the adjacent intermediate section steel casing or the casing male joint at the lower end of the connecting section steel casing through circumferentially arranged connecting pins; the casing male joint at the lower end of the intermediate section steel casing can be inserted and fixedly connected with the casing female joint at the upper end of the adjacent intermediate section steel casing or the casing female joint at the upper end of the drilling section steel casing through circumferentially arranged connecting pins.

[0043] Furthermore, the connecting section steel casing, the drilling section steel casing and the intermediate section steel casings all adopt an inner and outer double-wall steel casing structure, and circumferentially rotating spiral blades for discharging drill cuttings are respectively provided on the outer walls of the connecting section steel casing, the drilling section steel casing and the intermediate section steel casings; among them, a section of the spiral blade on the drilling section steel casing near the drilling ring is also provided with auxiliary cutting alloy blades.

[0044] Furthermore, the alloy drill bit includes a drill bit rod and alloy cutting teeth embedded at the lower end of the drill bit rod. The upper end of the drill bit rod has an adjustable angle insertion part, which can be inserted and installed on the drilling ring and fixed by a locking nut. The alloy cutting teeth are eccentrically arranged with respect to the adjustable angle insertion part, and the position of the alloy cutting teeth is adjusted by the insertion angle of the adjustable angle insertion part on the drilling ring.

[0045] Furthermore, the high-pressure nozzle extends to the bottom of the drilling section steel sleeve through the high-pressure connecting pipes on the inner barrel walls of each section of the steel sleeve. The high-pressure nozzle has a double-direction nozzle with an inverted "V" shape structure. The spraying direction of one nozzle faces the outer side of the barrel wall of the casing assembly, and the spraying direction of the other nozzle faces the inner side of the barrel wall of the casing assembly.

[0046] 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 through rotating mounting seats. The self-limiting baffles can perform a flipping motion in the radial direction. When the casing assembly rotates and drills downward, the self-limiting baffles flip upward and contract at the inner pipe wall of the casing assembly; when the casing assembly drills to the bottom of the pile to be pulled out and is pulled out, the self-limiting baffles flip towards the center of the casing assembly and are limited in the horizontal position.

[0047] Furthermore, the multi-channel rotary diverter includes a rotating seat and a diverter seat. The rotating seat is rotatably connected to the diverter seat. More than two annular grooves and several seals are provided between the rotating seat and the diverter seat. The rotating seat is provided with diversion channels communicated with the corresponding annular grooves. The lower ends of the diversion channels have outlet connectors, and the diverter seat is provided with inlet connectors communicated with the corresponding annular grooves.

[0048] Furthermore, a hydraulic vibrator is selectively provided at the upper end of the high-speed hydraulic power head.

[0049] A full-recovery silent and environment-friendly rotary pile pulling construction method of the present invention uses the above-mentioned full-recovery silent and environment-friendly rotary pile pulling construction equipment for construction, and includes the following construction steps:

[0050] S1. Site cleaning and measurement lofting: Remove the cap foundation above the pile top to expose the top of the pile body, and perform measurement lofting to locate the position of the pile to be pulled out;

[0051] S2. Construction equipment installation: Determine the model and construction parameters of the construction equipment according to the geological exploration report and the size, depth and form of the pile to be pulled out, and assemble the construction equipment;

[0052] S3. Rotary drilling: Drive the casing assembly to rotate at high speed through a high-speed hydraulic power head. At the same time, start the high-pressure pump group and air compressor, spray circulating fluid and high-pressure gas through the high-pressure nozzles at the bottom of the casing assembly, and use the lifting mast of the drill rig to sink the casing assembly to cut and crush the soil around the pile to be pulled out, and discharge the drilling slag. During the drilling process, if the length of the pile to be pulled out is less than the effective lifting stroke of the lifting mast, use a one-piece casing for drilling; if the length of the pile to be pulled out is greater than the effective lifting stroke of the lifting mast, use a segmented assembled casing and drill in sections; continue rotary drilling until below the bottom of the pile to be pulled out, so that the pile pulling mechanism at the bottom of the casing assembly is located below the bottom of the pile to be pulled out.

[0053] S4. Pile pulling: Stop the downward movement of the lifting mast, and continue the rotation of the casing assembly and the high-pressure spraying of the circulating fluid and high-pressure gas to reduce the drilling slag at the bottom of the pile to be pulled out, so that the pile pulling mechanism switches to the deployed pile pulling state; then, use the lifting mast to lift the casing assembly so that the pile pulling mechanism contacts and supports the bottom of the pile to be pulled out; continue to lift the casing assembly. If the above one-piece casing drilling is used, pull out the pile at one time; if the above segmented assembled casing is used, lift the casing assembly in sections and remove the corresponding sections of the casing and the pulled-out part of the pile one by one until all the piles are pulled out.

[0054] Furthermore, the drilling slag generated in step S3 enters the mud circulation device after being discharged. The mud circulation device includes a circulation tank and a circulation pool. The drilling slag entering the circulation pool precipitates and separates out the mud. The mud passes through a vibrating sand and gravel separator to separate out the circulating fluid and is re-input into the bottom of the casing assembly through the high-pressure pump group to form a high-pressure circulating fluid jet.

[0055] 3. Beneficial effects

[0056] Adopting the technical solution provided by the present invention, compared with the existing well-known technologies, it has the following remarkable effects:

[0057] (1) The invention discloses a fully-recoverable, silent and environmentally friendly rotary pile extraction construction method and construction equipment, which utilizes a high-speed hydraulic power head to drive the casing assembly to rotate at high speed, and uses a plurality of internal and external rotating alloy drill bits at the bottom of the casing to cut the soil on both sides of the inner and outer sides of the casing wall, and simultaneously utilizes a high-pressure pump group and an air compressor to input high-pressure circulating liquid and high-pressure gas to the high-pressure nozzle at the bottom of the casing to form a high-pressure jet on both sides of the inner and outer sides of the casing wall to cut the soil and bring the drill cuttings out of the hole, so that there is no soil adhesion between the casing and the pile body to be extracted, thereby reducing the torque generated by the casing drilling on the pile body to be extracted, and cooperating with the pile extraction mechanism at the bottom of the casing, the pile can be lifted and extracted from the bottom of the pile body to ensure the integrity of the pile body to be extracted, avoiding damage to the pile body, and achieving the purpose of lossless recovery of the old pile; the high-pressure circulating liquid jet and the high-pressure gas jet can wash the alloy drill bit and quickly bring out the drill cuttings, thereby greatly improving the drilling efficiency and depth, and improving the efficiency of the pile extraction construction; at the same time, it also has the advantages of low construction noise, good environmental protection, deep construction depth, strong adaptability, simple operation and low cost.

[0058] (2) The fully recyclable, silent and environmentally friendly rotary pile extraction construction equipment of the present invention has a casing assembly comprising a connecting steel sleeve, a drilling steel sleeve and an intermediate steel sleeve. The multi-section design can meet the needs of pile extraction at different depths, and in particular can achieve lossless extraction of very deep piles. Furthermore, each section of the steel sleeve is connected by a male connector and a female connector and fixedly connected by circumferentially arranged connecting pins, which makes the connection convenient, firm and reliable.

[0059] (3) The fully recyclable, silent and environmentally friendly rotary pile extraction construction equipment of the present invention has a connecting steel sleeve, a drilling steel sleeve and an intermediate steel sleeve, all of which adopt an inner and outer double-wall steel sleeve structure, which has a higher structural strength and is conducive to increasing the drilling depth to meet the needs of deeper old pile extraction; in addition, the outer walls of the connecting steel sleeve, the drilling steel sleeve and the intermediate steel sleeve are respectively provided with spiral blades in the same direction for discharging drill cuttings, and the lifting effect of the spiral blades can help to quickly carry the drill cuttings out of the hole to avoid the drill cuttings being deposited at the bottom of the hole and affecting the drilling efficiency; the spiral blades on the drilling steel sleeve are also provided with an auxiliary cutting alloy blade near the drilling ring to assist in cutting the soil outside the casing, further improving the efficiency of the drilling rig.

[0060] (4) The present invention is a fully recyclable, silent and environmentally friendly rotary pile extraction construction equipment, 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 drilling ring and fixed by a locking nut. The alloy drill bit can be adjusted in angle according to the geological survey report and the parameters of the pile body to be extracted before construction. It has strong applicability, simple structure, easy production, and flexible and convenient angle adjustment operation.

[0061] (5) A full-recovery silent and environmentally friendly rotary pile extraction construction equipment of the present invention. Its high-pressure nozzle extends to the bottom of the drilling section steel sleeve through the high-pressure connecting pipes on the inner barrel walls of each section of the steel sleeve. The high-pressure nozzle has a double-nozzle with an inverted "V" shape structure. The spraying direction of one nozzle faces the outer side of the barrel wall of the casing assembly, and the spraying direction of the other nozzle faces the inner side of the barrel wall of the casing assembly. With this "V" - shaped double-nozzle design, it can take into account the high-pressure jet spraying on both the inner and outer sides of the casing, quickly cut and disintegrate the soil on both the inner and outer sides of the casing. The structure is simple and easy to manufacture and install.

[0062] (6) A full-recovery silent and environmentally friendly rotary pile extraction construction equipment of the present invention. Its pile extraction 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 through rotating mounting seats and can perform a radial flipping motion. When the casing assembly rotates and drills down, the self-limiting baffles flip upwards and contract at the inner pipe wall of the casing assembly; when the casing assembly drills to the bottom of the pile to be extracted and is pulled out, the self-limiting baffles flip towards the center of the casing assembly and are limited in the horizontal position. This pile extraction mechanism has a simple and compact structure, does not require auxiliary equipment such as cranes, causes little damage to the pile body during the pile extraction process, and is convenient and fast for pile extraction.

[0063] (7) A full-recovery silent and environmentally friendly rotary pile extraction construction equipment of the present invention. Its multi-channel rotary diverter includes a rotating seat and a diverter seat, which can establish multiple channels, enabling the high-pressure nozzle to rotate while high-pressure jetting and cutting the soil, improving the casing drilling efficiency; moreover, the multi-channel design can be externally connected to a high-pressure pump group and an air compressor respectively. Using high-pressure gas, the drill cuttings formed by the alloy drill bit cutting the soil and the drill cuttings formed by the jet cutting of the high-pressure circulating liquid on the soil do not precipitate at the bottom of the hole, and efficiently carry the drill cuttings out of the hole. On the one hand, it can improve the drilling efficiency, and on the other hand, it can reduce the torque generated between the casing and the pile to be extracted, protecting the pile to be extracted from being damaged.

[0064] (8) A full-recovery silent and environmentally friendly rotary pile extraction construction equipment of the present invention. A hydraulic vibrator is also selectively provided at the upper end of its high-speed hydraulic power head. For hard strata, 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 strata while rotating, improving the drilling efficiency of the hard strata.

[0065] (9) A full-recovery silent and environmentally friendly rotary pile extraction construction method of the present invention. The drilling and extraction of the casing can be completed by using the lifting mast of the drilling rig. The equipment is simple and the input cost is low. Compared with the existing pile extraction process, the number of piles extracted per day can reach more than 10, and the pile extraction efficiency is greatly improved; and it can achieve non-destructive pile extraction and fully recycle the old piles.

[0066] (10) A fully recyclable, silent and environmentally friendly rotary pile pulling construction method of the present invention. The drill cuttings generated enter the mud circulation device after being discharged. The mud circulation device includes a circulation tank and a circulation pool. The drill cuttings entering the circulation pool are precipitated to separate the mud. The mud passes through a vibrating sand and gravel separator to separate the circulating liquid, and then the circulating liquid is input into the bottom of the casing assembly again through a high-pressure pump group to form a high-pressure circulating liquid jet, which can realize the reuse of the circulating liquid, reduce the pollution to the surrounding environment, and be more energy-saving and environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0067] Figure 1 It is a schematic diagram of the overall composition of a fully recyclable, silent and environmentally friendly rotary pile pulling construction equipment of the present invention;

[0068] Figure 2 It is a schematic diagram of the combined structure of the drilling rig and the rotary pile puller in the present invention;

[0069] Figure 3 It is a schematic diagram of the disassembled structure of the rotary pile puller in the present invention;

[0070] Figure 4 It is a schematic diagram of the assembled structure of the rotary pile puller in the present invention;

[0071] Figure 5 It is a schematic diagram of the sectional structure of the rotary pile puller in the present invention;

[0072] Figure 6 For Figure 5 The partial enlarged structure schematic diagram at position A in;

[0073] Figure 7 For Figure 5 The partial enlarged structure schematic diagram at position B in;

[0074] Figure 8 It is a schematic diagram of the assembled structure of the middle section steel sleeve in the present invention;

[0075] Figure 9 It is a schematic diagram of the disassembled structure of the middle section steel sleeve in the present invention;

[0076] Figure 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 contracted drilling state);

[0077] Figure 11 It is a schematic diagram of the bottom sectional structure of the drilling section steel sleeve in the present invention (the self-limiting baffle is in the contracted drilling state);

[0078] Figure 12 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 expanded pile pulling state);

[0079] Figure 13Schematic diagram of the bottom sectional view of the drilling section steel sleeve in the present invention (the self-limiting baffle is in the deployed pile-pulling state);

[0080] Figure 14 Schematic diagram of the structure of the alloy drill bit in the present invention;

[0081] Figure 15 Schematic diagram of the structure of the high-pressure nozzle in the present invention;

[0082] Figure 16 Schematic diagram of the construction state of a fully recyclable, silent, and environmentally friendly rotary pile-pulling construction equipment in the present invention;

[0083] Figure 17(a) is a schematic diagram of the construction steps of a fully recyclable, silent, and environmentally friendly rotary pile-pulling construction method in the present invention (non-drilling state);

[0084] Figure 17(b) is a schematic diagram of the construction steps of a fully recyclable, silent, and environmentally friendly rotary pile-pulling construction method in the present invention (drilling state);

[0085] Figure 17(c) is a schematic diagram of the construction steps of a fully recyclable, silent, and environmentally friendly rotary pile-pulling construction method in the present invention (drilling to the bottom of the pile state);

[0086] Figure 17(d) is a schematic diagram of the construction steps of a fully recyclable, silent, and environmentally friendly rotary pile-pulling construction method in the present invention (pile-pulling state).

[0087] Explanation of the reference numerals in the schematic diagram:

[0088] 100, casing assembly; 110, connecting section steel sleeve; 111, sleeve upper joint; 120, drilling section steel sleeve; 121, drilling ring; 122, alloy drill bit; 122a, outer-rotating alloy drill bit; 122b, inner-rotating alloy drill bit; 122-1, drill 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 section steel sleeve; 101, spiral blade; 102, sleeve male joint; 103, sleeve female joint; 104, high-pressure connecting pipe; 105, connecting pin;

[0089] 200, multi-channel rotary diverter; 201, rotating seat; 202, diverter seat; 203, annular groove; 204, seal; 205, diversion channel; 206, inlet joint; 207, outlet joint;

[0090] 300, high-speed hydraulic power head; 400, hydraulic vibrator;

[0091] 500, drill rig; 501, walking chassis; 502, cab; 503, lifting mast; 504, gripper; 505, drill rig hydraulic pump unit;

[0092] 600, Mud circulation device; 601, Circulation tank; 602, Circulation pool;

[0093] 700, High-pressure pump set; 800, Air compressor; 900, Pile to be pulled out. Detailed implementation manner

[0094] To further understand the content of the present invention, the present invention will be described in detail in combination with the accompanying drawings and embodiments.

[0095] [Embodiment]

[0096] Combined with Figure 1 and Figure 2 As shown in, a full-recovery silent and environmentally friendly rotary pile-pulling construction equipment of this embodiment includes a drilling rig 500, a high-pressure pump set 700, an air compressor 800 and a rotary pile puller. The rotary pile puller 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 installed on the lifting mast 503 of the drilling rig 500 through a gripper 504. The high-speed hydraulic power head 300 is coaxially connected to the casing assembly 100 through the multi-channel rotary diverter 200, and the whole rotary pile puller is driven by the lifting mast 503 to move up and down.

[0097] Among them, as Figure 5 , Figure 10 and Figure 12As shown, several alloy drill bits 122 and high-pressure spray nozzles 123 are distributed around the bottom of the casing assembly 100. The alloy drill bits 122 include outer-rotating alloy drill bits 122a distributed on the outer side of the casing wall of the casing assembly 100 and inner-rotating alloy drill bits 122b distributed on the inner side of the casing wall of the casing assembly 100. During the high-speed rotation of the casing assembly 100, the outer-rotating alloy drill bits 122a and the inner-rotating alloy drill bits 122b quickly cut the soil on the inner and outer sides of the casing wall of the casing assembly 100 to form drilling residues. The outer-rotating alloy drill bits 122a are responsible for cutting the soil outside the casing assembly 100, and the inner-rotating alloy drill bits 122b are responsible for cutting the soil inside the casing assembly 100. It is better that the outer-rotating alloy drill bits 122a and the inner-rotating alloy drill bits 122b are evenly distributed at the bottom of the casing respectively to ensure the uniformity of the force when cutting the soil. Through the above design of the alloy drill bits 122, there is no soil adhesion between the casing and the pile body 900 to be pulled out, thus ensuring the integrity of the pile body 900 to be pulled out and preventing the pile body 900 to be pulled out from being damaged. The high-pressure spray nozzles 123 are connected to the corresponding outlet joints 207 of the multi-channel rotary diverter 200 through high-pressure connecting pipes 104 provided on the inner casing wall of the casing assembly 100. High-pressure fluid medium can be input through the multi-channel rotary diverter 200. The spraying directions of the high-pressure spray nozzles 123 are respectively towards the outer side and the inner side of the casing wall of the casing assembly 100. The high-pressure jet generated by the high-pressure spray nozzles 123 can be used to rotate and cut the soil on the inner and outer sides of the casing assembly 100 to improve the drilling efficiency. The high-pressure pump group 700 and the air compressor 800 are respectively connected to the corresponding high-pressure spray nozzles 123 through the multi-channel rotary diverter 200. High-pressure circulating liquid jets and high-pressure gas jets are formed through the high-pressure spray nozzles 123 to cut the soil and carry the drilling residues out of the hole. Through the cooperation of the high-speed rotation cutting of the alloy drill bits 122 and the rotary flushing cutting of the high-pressure jets, it is not necessary for the alloy drill bits 122 to be embedded very deep into the soil. Furthermore, it is not necessary for the casing assembly 100 to generate a large torque to cut the soil. In this way, when the casing assembly 100 rotates, it will not generate a large torque on the pile body 900 to be pulled out, thus ensuring the integrity of the pile body 900 to be pulled out and preventing it from being damaged. The high-pressure circulating liquid jets and the high-pressure gas jets can also play a role in flushing the alloy drill bits 122 to prevent the alloy drill bits 122 from being clogged. The high-pressure gas can rotate and cut the soil at the bottom of the hole to disperse the soil. At the same time, by using the floating effect of the gas, it is ensured that the drilling residues formed by the soil cut by the alloy drill bits 122 and the drilling residues formed by the soil cut by the high-pressure circulating liquid jets do not precipitate at the bottom of the hole, and the drilling residues can be efficiently carried out of the hole, improving the drilling efficiency. In addition, since the drilling residues are discharged in time and there is less drilling residue at the bottom of the hole, the torque generated between the casing and the pile body 900 to be pulled out is small, thus further ensuring the integrity of the pile body 900 to be pulled out and preventing the pile body from being damaged.

[0098] Refer to Figures 10 to 13As shown in the figure, a pile pulling mechanism is provided at the bottom of the above-mentioned casing assembly 100. The pile pulling mechanism has a contracted drilling state and an extended pile pulling state. When the casing assembly 100 rotates and drills down, the pile pulling mechanism is in the contracted drilling state, so that the pile body 900 to be pulled can pass through the pile pulling mechanism and enter the casing assembly 100; when the casing assembly 100 drills to the bottom of the pile body 900 to be pulled and is pulled up, at this time the pile body 900 to be pulled is located inside the casing assembly 100, and the pile pulling mechanism switches to the extended pile pulling state, so as to make the pile pulling mechanism buckle with the bottom of the pile body 900 to be pulled and be pulled out together with the casing assembly 100. With the above pile pulling mechanism, auxiliary equipment such as a crane is not required, and the casing assembly 100 can be used to protect the pile body and prevent the pile body from being damaged.

[0099] In a full-recovery silent and environmentally friendly rotary pile pulling construction equipment of this embodiment, for pile bodies with relatively shallow depths, its rotary pile puller can adopt an integrated casing structure, and efficient drilling and pile pulling construction can be carried out; for pile bodies with relatively deep depths, limited by the height of the drilling rig 500, a multi-section assembled casing design is preferably adopted. To meet the requirements of pulling old piles with different pile depths, in this embodiment, the casing assembly 100 includes a connecting section steel casing 110, a drilling section steel casing 120, and an intermediate section steel casing 130. A number of intermediate section steel casings 130 are provided between the connecting section steel casing 110 and the drilling section steel casing 120 according to the depth of the pile pulling construction. The number of intermediate section steel casings 130 is determined according to the depth of the pile body 900 to be pulled. For example, Figure 3 and Figure 4 As shown in the figure, a two-section casing structure is adopted, that is, there is no intermediate section steel casing 130. When the intermediate section steel casing 130 is needed, it can be installed between the connecting section steel casing 110 and the drilling section steel casing 120 to extend the overall length of the casing assembly 100. Among them: a casing upper joint 111 for connecting with the multi-channel rotary diverter 200 is provided at the upper end of the connecting section steel casing 110. The casing upper joint 111 can be welded to the connecting section steel casing 110, and the upper end of the casing upper joint 111 is connected to the multi-channel rotary diverter 200 by a flange structure; a casing male joint 102 is provided at the lower end of the connecting section steel casing 110. A casing female joint 103 is provided at the upper end of the drilling section steel casing 120, and a drilling ring 121 is fixedly provided at the lower end of the drilling section steel casing 120. The drilling ring 121 can be welded to the drilling section steel casing 120, and the alloy drill bit 122 is installed on the drilling ring 121. A casing female joint 103 that matches the casing male joint 102 of the above-mentioned connecting section steel casing 110 is provided at the upper end of the intermediate section steel casing 130, and a casing male joint 102 that matches the casing female joint 103 of the above-mentioned drilling section steel casing 120 is provided at the lower end of the intermediate section steel casing 130; the casing female joint 103 at the upper end of the intermediate section steel casing 130 can be inserted into the casing male joint 102 at the lower end of the adjacent intermediate section steel casing 130 or the casing male joint 102 at the lower end of the connecting section steel casing 110 and fixedly connected by a circumferentially arranged connecting pin 105 (such asFigure 7 As shown in the figure); the socket male joint 102 at the lower end of the middle section steel socket 130 can be inserted into the socket female joint 103 at the upper end of the adjacent middle section steel socket 130 or the socket female joint 103 at the upper end of the drilling section steel socket 120 and fixedly connected by the circumferentially arranged connecting pins 105. Through the multi-section design, it can meet the requirements of pulling out piles with different depths, especially realizing the non-destructive pulling out of very deep piles; moreover, the male and female joints of each section of steel socket are inserted and fixedly connected by the circumferentially arranged connecting pins, which is convenient for connection and firm and reliable.

[0100] Furthermore, the above-mentioned connecting section steel socket 110, drilling section steel socket 120 and middle section steel socket 130 are all preferably of the structure of an inner and outer double-wall steel socket, that is, the steel socket is composed of an inner and an outer steel casing, and the inner and outer steel casings are fixedly connected together in sequence by a number of connecting rings, with higher structural strength, which is beneficial to increasing the drilling depth to meet the need of pulling out deeper old piles. In theory, it can be constructed to more than 100m. In addition, as Figure 3 、 Figure 4 as well as Figure 8 and Figure 9 shown, on the outer walls of the connecting section steel socket 110, drilling section steel socket 120 and middle section steel socket 130, there are also spiral blades 101 with the same rotation direction for discharging drilling slag respectively. Through the lifting action of the spiral blades 101, it can help quickly carry the drilling slag out of the hole, avoiding the precipitation of drilling slag at the bottom of the hole and affecting the drilling efficiency. Among them, a section of the spiral blade 101 on the drilling section steel socket 120 close to the drilling ring 121 is also provided with auxiliary cutting alloy blades, which can assist in cutting the soil outside the casing and further improve the drilling efficiency of the drill.

[0101] The above-mentioned alloy drill bit 122 adopts an angle-adjustable design and can be adjusted according to the geological exploration report and the parameters of the pile to be pulled out, etc. Specifically, refer to Figure 10 、 Figure 12 and Figure 14As shown, the alloy drill bit 122 includes a drill bit rod 122-1 and alloy cutting teeth 122-2 embedded at the lower end of the drill bit rod 122-1. The upper end of the drill bit rod 122-1 has an adjustable-angle plug-in portion 122-3, which can be plugged and installed on the drilling ring 121 and fixed by a locking nut 122-4. The alloy cutting teeth 122-2 are eccentrically arranged with respect to the adjustable-angle plug-in portion 122-3. The position of the alloy cutting teeth 122-2 is adjusted by the plug-in angle of the adjustable-angle plug-in portion 122-3 on 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°. The adjustable-angle plug-in portion 122-3 adopts an external spline structure. Correspondingly, the drilling ring 121 has an internal spline hole. During installation, the position of the alloy cutting teeth 122-2 can be adjusted according to the mating angle of the internal and external splines. This can facilitate the adjustment of the angles and positions of the external-rotation alloy drill bit 122a and the internal-rotation alloy drill bit 122b. For example, the number of the external-rotation alloy drill bits 122a and the internal-rotation alloy drill bits 122b can be changed, such that the number of the external-rotation alloy drill bits 122a is more than that of the internal-rotation alloy drill bits 122b, etc. With the above alloy drill bit 122, it has strong applicability, simple structure, convenient manufacturing, and flexible and convenient angle adjustment operation.

[0102] Referring to Figure 5 and Figure 15 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 on the inner wall of each section of the steel sleeve. The high-pressure nozzle 123 has a double-nozzle with an inverted "V" shape structure. The jet direction of one nozzle faces the outside of the barrel wall of the casing assembly 100, and the jet direction of the other nozzle faces the inside of the barrel 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 connection of the high-pressure connecting pipes 104 inside each section of the casing is carried out together. With this "V"-shaped double-nozzle design, it can take into account the high-pressure jet injection on both the inside and outside of the casing, quickly cut and disintegrate the soil on both the inside and outside of the casing, with simple structure, easy to manufacture and install.

[0103] Connect Figures 10 to 13As shown in the figure, for the full-recovery silent and environmentally friendly rotary pile-pulling construction equipment of this embodiment, its 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 through rotating mounting seats 124. The self-limiting baffles 125 can perform a radial flipping motion. When the casing assembly 100 rotates and drills downward, the self-limiting baffles 125 are subjected to resistance and flip upward and contract at the inner pipe wall of the casing assembly 100, so that the pile body 900 to be pulled can pass through normally; when the casing assembly 100 drills to the bottom of the pile body 900 to be pulled and is pulled upward, under the action of the upward pull and the self-weight of the self-limiting baffles 125, the self-limiting baffles 125 flip towards the center of the casing assembly 100 and are limited in the horizontal position. At this time, the distance between the self-limiting baffles 125 is smaller than the size of the pile body 900 to be pulled. Therefore, the pile body 900 to be pulled can be supported from the bottom and be pulled out together with the upward pull of the casing assembly 100. This pile-pulling mechanism has a simple and compact structure, does not require auxiliary equipment such as a crane, causes little damage to the pile body during the pile-pulling process, and is convenient and fast for pile-pulling. 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 expand during upward pulling through a mechanical structure, etc. Other feasible designs here include: 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. The hinge axis of the flap is arranged along the casing bus, and the hinge axis is located on the front side of the casing rotation direction. In this way, during the rotation and drilling process of the casing, each flap is kept in the flap hole under the action of resistance. At the same time, a nozzle facing the flap is arranged outside the flap hole. After the casing assembly 100 drills to the bottom of the pile body 900 to be pulled, the flap is flipped inward by spraying high-pressure jet through the nozzle. The flipped flap is located at the bottom of the pile body 900 to be pulled, playing a role in lifting the pile body 900 to be pulled. A similar deformation scheme can also set a torsion spring at the hinge axis of the flap, so that the flap has a tendency to flip inward. During the rotation and drilling process of the casing, each flap overcomes the elastic force of the torsion spring under the action of resistance and is kept in the flap hole. When the casing assembly 100 drills to the bottom of the pile body 900 to be pulled, the casing assembly 100 is rotated in the reverse direction. At this time, the flap can also be flipped inward under the combined action of the torsion spring and the reverse rotation resistance and is located at the bottom of the pile body 900 to be pulled.

[0104] In this embodiment, the multi-channel rotary diverter 200 is a rotatable connector that can be externally connected to high-pressure fluid and establish a fluid delivery channel. Refer to Figure 6As shown in the figure, the above-mentioned multi-channel rotary diverter 200 includes a rotating seat 201 and a diverter seat 202. The rotating seat 201 is rotatably connected to the diverter seat 202. There are more than two annular grooves 203 and a number of seals 204 provided between the rotating seat 201 and the diverter seat 202. A diverter channel 205 communicating with the corresponding annular groove 203 is provided in the rotating seat 201. The lower ends of the respective diverter channels 205 have outlet connectors 207, and inlet connectors 206 communicating with the corresponding annular grooves 203 are provided on the diverter seat 202. The annular groove 203 realizes the communication between the inlet connector 206 and the corresponding diverter channel 205, and the seal 204 realizes the seal between the rotating seat 201 and the diverter seat 202 and the seal between the respective annular grooves 203. Thus, different high-pressure fluids, such as high-pressure gas and high-pressure circulating liquid, etc., can be connected to different diverter channels 205. During 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 sleeve upper joint 111 by a flange structure, and the inlet connector 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 communication between the inlet connector 206 and the corresponding diverter channel 205. The above-mentioned multi-channel rotary diverter 200 can realize the establishment of multiple channels, enabling the high-pressure nozzle to perform high-pressure jet cutting of the soil while rotating, improving the casing drilling efficiency; moreover, the multi-channel design can be respectively externally connected to a high-pressure pump group 700 and an air compressor 800. By using high-pressure gas, the drill cuttings formed by the alloy drill bit cutting the soil and the drill cuttings formed by the jet cutting of the soil by the high-pressure circulating liquid do not precipitate at the bottom of the hole, and the drill cuttings are efficiently discharged out of the hole. On the one hand, the drilling efficiency can be improved, and on the other hand, the torque generated between the casing and the pile body 900 to be pulled out can be reduced, protecting the pile body 900 to be pulled out from being damaged.

[0105] Referring to Figures 3 to 5 As shown in the figure, for hard formations, a hydraulic vibrator 400 is also selectively provided at the upper end of the high-speed hydraulic power head 300. 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, 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 construction machinery and will not be elaborated here.

[0106] Figure 16The schematic diagram of the construction state of the above-mentioned fully recyclable, silent, and environmentally friendly rotary pile extraction construction equipment is shown. In the above-mentioned drill rig 500, the traveling chassis 501 preferably adopts a crawler structure. On the traveling chassis 501, there are also devices such as a cab 502, a drill rig hydraulic pump unit 505, and a control cabinet. Both the traveling chassis 501 and the lifting mast 503 can be driven by the hydraulic system of the drill rig hydraulic pump unit 505. As for other structures and working principles of the drill rig 500, they are similar to those of the prior art, so they will not be elaborated here.

[0107] This embodiment also relates to a fully recyclable, silent, and environmentally friendly rotary pile extraction construction method. The specific construction steps are as follows with reference to Figures 17(a) to 17(d) As shown, it uses the above-mentioned fully recyclable, silent, and environmentally friendly rotary pile extraction construction equipment for construction, including the following construction steps:

[0108] S1. Site cleaning and measurement layout: Remove the cap foundation above the pile top to expose the top of the pile body, and conduct measurement layout to locate the position of the pile body 900 to be extracted. During the site cleaning process, an excavator and a crusher can be used to remove the cap foundation above the pile top to ensure that the top of the pile body is exposed for subsequent construction operations. During the measurement layout process, a total station or a theodolite can be used for measurement layout to accurately locate the position of the pile body to be extracted and ensure the accuracy of construction.

[0109] S2. Installation of construction equipment: Determine the model and construction parameters of the construction equipment according to the geological exploration report and the size, depth, and form of the pile body 900 to be extracted, and assemble the construction equipment. First, analyze the geological exploration report and the parameters of the pile body to be extracted, and decide on the form and angle of the alloy drill bit to be used and various construction parameters, including the height of the lifting mast 503 and the models of various equipment. Then, install the drilling tools in sequence, select alloy drill bits of different strengths according to different strata, and adjust the appropriate cutting angle, and install and fix them on the drilling ring 121 of the steel sleeve. Check the connections between the pile extraction mechanism, the high-pressure nozzle 123, and each steel sleeve respectively to ensure the reliability and safety of the pile extraction mechanism, the high-pressure nozzle 123, and each steel sleeve during construction. Install the high-pressure pump unit 700 and the air compressor 800. To ensure sufficient supply and pressure stability of the circulating fluid, two high-pressure pump units 700 can be set. The specific installation process of the rotary pile extractor is as follows:

[0110] ① Install the high-speed hydraulic power head 300: Install the high-speed hydraulic power head 300 on the gripper 504 of the lifting mast 503; according to the formation hardness, a hydraulic vibrator 400 can be installed on the high-speed hydraulic power head 300 to ensure the normal operation of the equipment;

[0111] ②Install the multi-channel rotary diverter 200: Install the multi-channel rotary diverter 200 at the output end of the high-speed hydraulic power head 300, and connect the inlet joints 206 of the multi-channel rotary diverter 200 to the high-pressure pump group 700 and the air compressor 800 respectively;

[0112] ③Install the connecting section steel sleeve 110: Flange-connect the sleeve upper joint 111 at the upper end of the connecting section steel sleeve 110 to the multi-channel rotary diverter 200 to ensure firm connection. At the same time, connect the high-pressure pipeline inside the connecting section steel sleeve 110 to the corresponding outlet joint 207 of the multi-channel rotary diverter 200 to ensure correct pipeline connection and good sealing;

[0113] ④Install the drilling section steel sleeve 120 and the intermediate section steel sleeve 130: The drilling section steel sleeve 120 is located at the bottom end of the casing assembly 100. According to the height requirement of the casing assembly 100, it can be lengthened between the connecting section steel sleeve 110 and the drilling section steel sleeve 120 through the intermediate section steel sleeve 130, and connect the corresponding pipelines;

[0114] ⑤Install the alloy drill bit 122 and the high-pressure nozzle 123: Finally, install the alloy drill bit 122 and the high-pressure nozzle 123 at the bottom of the drilling section steel sleeve 120 respectively to ensure the correct installation direction of the alloy drill bit 122 and the high-pressure nozzle 123;

[0115] ⑥Start the equipment for debugging and trial operation: First, start the high-speed hydraulic power head 300, the high-pressure pump group 700 and the air compressor 800, and transport the high-pressure flushing circulating liquid and high-pressure gas to the bottom of the drill bit through the multi-channel rotary diverter 200. Conduct a trial rotation to check whether the pressure of each pipeline meets the design requirements and ensure the normal operation of the equipment.

[0116] S3. Rotary drilling: As shown in Fig. 17(a), the casing assembly 100 is driven by a high-speed hydraulic power head 300 to rotate at a high speed. At the same time, the high-pressure pump group 700 and the air compressor 800 are started. The circulating fluid and high-pressure gas are sprayed through the high-pressure nozzle 123 at the bottom of the casing assembly 100. The casing assembly 100 is sunk by the lifting mast 503 of the drilling rig 500 to cut and crush the soil around the pile to be pulled out 900, and the drilling slag is discharged. During the drilling process, if the length of the pile to be pulled out 900 is less than the effective lifting and lowering stroke of the lifting mast 503, one-time casing drilling is adopted, that is, only one drilling section steel sleeve 120 is required. If the length of the pile to be pulled out 900 is greater than the effective lifting and lowering stroke of the lifting mast 503, the casing is assembled in sections and drilled section by section, that is, the connecting section steel sleeve 110, the drilling section steel sleeve 120 and multiple intermediate section steel sleeves 130 are used for assembly. As shown in Fig. 17(b), continue rotary drilling so that the pile to be pulled out 900 enters the inner side of the casing assembly 100, and the casing assembly 100 breaks and removes the soil on both its inner and outer sides from the hole position. As shown in Fig. 17(c), continue rotary drilling until below the bottom of the pile to be pulled out 900. Generally, the pile pulling mechanism is located about 1 m below the bottom of the pile, and the pile pulling mechanism at the bottom of the casing assembly 100 is located below the bottom of the pile to be pulled out 900.

[0117] S4. Pile pulling: As shown in Fig. 17(d), stop the downward movement of the lifting mast 503, and continue the rotation of the casing assembly 100 and the high-pressure spraying of the circulating fluid and high-pressure gas to reduce the drilling slag at the bottom of the pile to be pulled out 900, so that the pile pulling mechanism switches to the unfolded pile pulling state. Then, use the lifting mast 503 to lift the casing assembly 100 so that the pile pulling mechanism contacts and supports the bottom of the pile to be pulled out 900. Continue to lift the casing assembly 100. If the above one-time casing drilling is adopted, the pile is pulled out at one time. If the above sectional assembly casing is adopted, the casing assembly 100 is pulled out section by section, and the corresponding section of the casing and the pulled-out part of the pile are removed section by section until all the piles are pulled out. During the pile pulling process, slowly lift the whole set of drilling tools. After confirming that the pile pulling mechanism is completely locked to the pile to be pulled out 900, continue to slowly lift the drilling tools. During the sectional lifting process, after a section of steel casing is completely exposed, the casing assembly 100 can be fixed by the rack crane, and then the corresponding exposed steel casing is removed. At this time, a section of the pile to be pulled out 900 is exposed, and the exposed section of the pile to be pulled out can be cut by a plasma cutting machine, while paying attention to the cutting position and range to ensure the integrity of the pile body. Repeat the above pulling steps to gradually pull out all the piles. If it is a cast-in-place pile, use a ring hydraulic breaking shear to cut it off, and at the same time use a plasma cutting machine to cut the steel bars.

[0118] In the full-recovery silent and environmentally friendly rotary pile pulling construction method of this embodiment, the drilling slag generated in step S3 enters the mud circulation device 600 after being discharged. Refer to Figure 1As shown, the mud circulation device 600 includes a circulation tank 601 and a circulation pool 602. The drill cuttings entering the circulation pool 602 are precipitated to separate the mud. The mud is separated into the circulating liquid through the vibrating sand and gravel separator and then re-entered into the bottom of the casing assembly 100 through the high-pressure pump group 700 to form a high-pressure circulating liquid jet, which can realize the reuse of the circulating liquid, reduce the pollution to the surrounding environment, and be more energy-saving and environmentally friendly. During the drilling process, the circulating liquid fills the entire hole wall, protects the hole wall, and prevents the hole wall from collapsing; the sand and gravel slurry in the hole wall can be pumped into the circulation tank 601 by the mud pump and flows into the circulation pool 602. In the circulation pool 602, the sand and gravel are quickly precipitated, and the circulating liquid treated by the vibrating sand and gravel separator can be reused. After the pile body is pulled out, the drill cuttings can be used to backfill the pile hole.

[0119] The invention discloses a fully-recoverable, silent and environmentally friendly rotary pile pulling construction method and construction equipment, which utilizes a high-speed hydraulic power head to drive the casing assembly to rotate at a high speed, and cuts the soil on both sides of the inner and outer sides of the barrel wall through a plurality of internal and external rotating alloy drill bits at the bottom of the casing, and simultaneously utilizes a high-pressure pump group and an air compressor to input high-pressure circulating liquid and high-pressure gas to the high-pressure nozzle at the bottom of the casing to form a high-pressure jet flow on both sides of the inner and outer sides of the barrel wall to cut the soil and bring the drill residue out of the hole, so that there is no soil adhesion between the casing and the pile body to be pulled out, and the torsion force generated by the casing drilling on the pile body to be pulled out is reduced. In conjunction 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 the old pile; the high-pressure circulating liquid jet and the high-pressure gas jet can wash the alloy drill bit and quickly bring out the drill residue, which greatly improves the drilling efficiency and depth, and improves the efficiency of the pile pulling construction; and the invention also has the advantages of low construction noise, good environmental protection, deep construction depth, strong adaptability, simple operation and low cost.

[0120] 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 and environmentally friendly rotary pile pulling construction equipment, comprising a drilling rig (500), a high-pressure pump group (700), an air compressor (800) and a rotary pile puller, characterized in that: The rotary pile puller comprises a casing assembly (100), a multi-channel rotary flow divider (200) and a high-speed hydraulic power head (300); the high-speed hydraulic power head (300) is mounted on a lifting mast (503) of a drilling rig (500) via a clamp (504); the high-speed hydraulic power head (300) is coaxially connected to the casing assembly (100) via the multi-channel rotary flow divider (200); A plurality of alloy drill bits (122) and high-pressure spray heads (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 outer side of the casing wall of the casing assembly (100) and an inwardly rotating alloy drill bit (122b) distributed on the inner side of the casing wall of the casing assembly (100); the high-pressure spray head (123) is connected to the multi-channel rotating alloy drill bit (122a) via a high-pressure connecting pipe (104) provided on the inner wall of the casing assembly (100). The high-pressure nozzle (123) is connected to the outlet joint (207) corresponding to the flow divider (200), and the spraying direction of the high-pressure nozzle (123) is respectively toward the outer side and the inner side of the tube wall of the casing assembly (100); the high-pressure pump group (700) and the air compressor (800) are respectively connected to the corresponding high-pressure nozzle (123) through the multi-channel rotary flow divider (200), and the high-pressure circulating liquid jet and the high-pressure gas jet are formed through the high-pressure nozzle (123) to cut the soil and bring the drilling slag out of the hole; A pile pulling mechanism is provided at the bottom of the casing assembly (100), and the pile pulling mechanism has a retracted drilling state and an extended pile pulling state. When the casing assembly (100) is rotated, drilled and sunk, the pile pulling mechanism is in the retracted drilling state, so that the pile body (900) 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 (900) 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 (900) to be pulled out together with the casing assembly (100).

2. The fully recyclable, silent and environmentally friendly rotary pile extraction construction equipment according to claim 1 is characterized by: The casing assembly (100) comprises a connecting steel sleeve (110), a drilling steel sleeve (120) and an intermediate steel sleeve (130), wherein a plurality of intermediate steel sleeves (130) are arranged between the connecting steel sleeve (110) and the drilling steel sleeve (120) according to the construction depth of the pile pulling; wherein: The upper end of the connecting steel sleeve (110) is provided with a sleeve upper joint (111) for connecting to the multi-channel rotary diverter (200), and 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), the lower end of the drilling steel sleeve (120) is fixedly provided with a drilling ring (121), and the alloy drill bit (122) is installed on the drilling ring (121); The upper end of the intermediate steel sleeve (130) is provided with a sleeve female joint (103) matched with the sleeve male joint (102) of the connecting steel sleeve (110), and the lower end of the intermediate steel sleeve (130) is provided with a sleeve male joint (102) matched with the sleeve female joint (103) of the drilling steel sleeve (120); The sleeve female joint (103) at the upper end of the intermediate steel sleeve (130) can be plugged into the sleeve male joint (102) at the lower end of the adjacent intermediate steel sleeve (130) or the sleeve male joint (102) at the lower end of the connecting steel sleeve (110) and fixedly connected via a circumferentially arranged connecting pin (105); the sleeve male joint (102) at the lower end of the intermediate steel sleeve (130) can be plugged into the sleeve female joint (103) at the upper end of the adjacent intermediate steel sleeve (130) or the sleeve female joint (103) at the upper end of the drilling steel sleeve (120) and fixedly connected via a circumferentially arranged connecting pin (105).

3. The fully recyclable, silent and environmentally friendly rotary pile extraction construction equipment according to claim 2 is characterized by: The connecting steel sleeve (110), the drilling steel sleeve (120) and the intermediate steel sleeve (130) all adopt an inner and outer double-wall steel sleeve structure, and spiral blades (101) with the same rotation direction for discharging drilling slag are respectively provided on the outer walls of the connecting steel sleeve (110), the drilling steel sleeve (120) and the intermediate steel sleeve (130); wherein, the spiral blades (101) on the drilling steel sleeve (120) are also provided with auxiliary cutting alloy blades at a section close to the drilling ring (121).

4. The fully recyclable, silent and environmentally friendly rotary pile extraction construction equipment according to claim 2 is characterized by: 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 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 drilling ring (121).

5. The fully recyclable, silent and environmentally friendly rotary pile extraction construction equipment according to claim 2 is characterized by: The high-pressure nozzle (123) extends to the bottom of the drilling section steel sleeve (120) through the high-pressure connecting pipe (104) on the inner wall of each section steel sleeve, and the high-pressure nozzle (123) has a bidirectional nozzle in an inverted "V" shape structure, the spray direction of one nozzle is toward the outer side of the wall of the casing assembly (100), and the spray direction of the other nozzle is toward the inner side of the wall of the casing assembly (100).

6. The fully recyclable, silent and environmentally friendly rotary pile extraction construction equipment according to any one of claims 1 to 5, 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) rotates, drills and sinks, the self-limiting baffles (125) flip upward and shrink at the inner pipe wall of the casing assembly (100); when the casing assembly (100) drills to the bottom of the pile body (900) to be pulled out and pulls upward, the self-limiting baffles (125) flip toward the center of the casing assembly (100) and are limited at a horizontal position.

7. The fully recyclable, silent and environmentally friendly rotary pile extraction construction equipment according to any one of claims 1 to 5, 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).

8. The fully recyclable, silent and environmentally friendly rotary pile extraction construction equipment according to any one of claims 1 to 5, characterized in that: The upper end of the high-speed hydraulic power head (300) is also selectively provided with a hydraulic vibrator (400).

9. A fully-recyclable, silent and environmentally friendly rotary pile extraction construction method, characterized in that: The construction is carried out using the fully recyclable, silent and environmentally friendly rotary pile pulling construction equipment described in any one of claims 1 to 8, comprising the following construction steps: S1. Site cleaning and measurement and setting out: Clear the foundation of the platform above the pile top to expose the top of the pile body, and perform measurement and setting out to locate the position of the pile body to be pulled out (900); S2. Installation of construction equipment: according to the geological survey report and the size, depth and form of the pile body (900) to be pulled out, determine the model and construction parameters of the construction equipment, and assemble the construction equipment; S3, rotary drilling; the casing assembly (100) is driven to rotate at high speed by a high-speed hydraulic power head (300), and the high-pressure pump group (700) and the air compressor (800) are started at the same time, and the circulating fluid and high-pressure gas are sprayed through the high-pressure nozzle (123) at the bottom of the casing assembly (100), and the casing assembly (100) is sunk by the lifting mast (503) of the drilling rig (500) to cut and crush the soil around the pile body (900) to be pulled out, and discharge the drilling residue; during the drilling process, if the length of the pile body (900) to be pulled out is less than the effective lifting stroke of the lifting mast (503), a one-time casing drilling is adopted; if the length of the pile body (900) to be pulled out is greater than the effective lifting stroke of the lifting mast (503), the casing is assembled in sections and drilled section by section; the rotary drilling is continued to the bottom of the pile body (900) to be pulled out, so that the pile pulling mechanism at the bottom of the casing assembly (100) is located below the bottom of the pile body (900) to be pulled out; S4, pulling up the pile body: stop the downward movement of the lifting mast (503), and continue the rotation of the casing assembly (100) and the high-pressure injection of the circulating fluid and the high-pressure gas to reduce the drilling debris at the bottom of the pile body (900) to be pulled out, so that the pile pulling mechanism switches to the unfolded pile pulling state; then, use the lifting mast (503) to lift the casing assembly (100) so that the pile pulling mechanism contacts and supports the bottom of the pile body (900) to be pulled out; continue to lift the casing assembly (100), if the above-mentioned disposable casing drilling is adopted, the pile body is lifted at one time; if the above-mentioned segmented casing assembly is adopted, the casing assembly (100) is lifted segment by segment and the corresponding segment casing and the pulled-out pile body part are removed segment by segment until all the pile bodies are pulled out.

10. The fully-recoverable, silent and environmentally friendly rotary pile extraction construction method according to claim 9 is characterized in that: The drill cuttings generated in step S3 are discharged and enter the mud circulation device (600), which includes a circulation tank (601) and a circulation pool (602). The drill cuttings entering the circulation pool (602) are precipitated and separated into mud. The mud is separated into circulating liquid by a vibrating sand and gravel separator and then re-input into the bottom of the casing assembly (100) through a high-pressure pump group (700) to form a high-pressure circulating liquid jet.

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