A composite pile machine

Abstract

The application provides a composite pile machine, which comprises a pile frame, a pile sinking mechanism and a material injection and stirring mechanism, the material injection and stirring mechanism comprises a drill rod and a cutting and stirring drill bit, the drill rod is internally provided with a conveying channel for conveying building particles, and a first discharge port for the conveying channel is formed in the bottom of the drill rod, the cutting and stirring drill bit is internally provided with a liquid injection pipe, the liquid injection pipe is provided with a liquid outlet, and the vertical projection of the drill rod is located in the vertical projection range of the cutting and stirring drill bit. The composite pile machine can realize cutting and stirring of the soil body and conveying of the building particles for reinforcing the soil body through the material injection and stirring mechanism, the overall applicability of the material injection and stirring mechanism is enhanced, cutting and stirring and feeding are not operated separately, the construction operation is simplified, the water content of the composite pile is reduced, the pile body consolidation efficiency is improved, the pile body strength is improved through the particles, the pile is planted through the pile sinking mechanism, one device can complete hole forming and pile planting, and the construction efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of foundation treatment technology, and specifically to a composite pile driver. Background Technology

[0002] In my country, soft soil foundations are frequently encountered in urban foundation construction. Due to their high water content, large porosity, poor permeability, and low bearing capacity, if construction is carried out directly on soft soil foundations without any treatment, serious consequences such as deformation of the foundation under load leading to building subsidence, surface cracks, or even fractures may occur. Therefore, it is necessary to reinforce soft soil foundations to meet the construction requirements for buildings or structures built on them.

[0003] Currently, the treatment method for soft soil foundations is usually to cut and mix the soil with a drill rod, while injecting a liquid solidifying material, namely solidifying mud, into the soil through the drill rod. However, the composite piles produced by existing pile drivers have high water content, slow strength improvement, and affect the construction progress. Furthermore, the solidifying material injected through the drill rod and drill bit is usually just cement powder, which is costly and lacks aggregate, affecting the strength of the pile body. Summary of the Invention

[0004] To address the technical problems of high moisture content and low strength in composite piles manufactured by pile drivers, this invention provides a composite pile driver.

[0005] To achieve the objectives of this invention, the following technical solution is adopted:

[0006] A composite pile driver includes: a pile frame, a pile driving mechanism movably installed on the pile frame, and a material mixing mechanism. The pile driving mechanism has a main pile clamp. The material mixing mechanism includes a drill rod and a cutting and mixing drill bit installed at the bottom of the drill rod. The drill rod has a built-in conveying channel for conveying building particles, and the bottom of the drill rod has a first discharge port connected to the conveying channel. The cutting and mixing drill bit has a liquid injection pipe with a liquid outlet. The vertical projection of the drill rod (31) is located within the vertical projection range of the cutting and mixing drill bit (32).

[0007] Compared with existing technologies, the beneficial effects of this invention are as follows: First, by delivering liquid through the injection pipe inside the cutting and mixing drill bit, and adding liquid into the soil through the outlet of the injection pipe, the cutting and mixing drill bit can cut and mix the soil, thereby improving the drilling efficiency of the mixing drill bit. Second, by conveying dried building particles containing aggregate through the conveying channel inside the drill rod, the moisture content of the composite pile is reduced, the pile consolidation efficiency is improved, the construction progress is accelerated, and the pile strength is increased through the aggregate particles. Third, the precast pile is clamped by the main pile clamp of the pile driving mechanism and inserted into the pile hole. That is, the composite pile machine of this invention can first achieve cutting and mixing of the soil and conveying building particles to reinforce the soil through the injection and mixing mechanism, enhancing the overall applicability of the injection and mixing mechanism, avoiding separate operations for cutting and mixing and feeding, simplifying the construction operation, and then planting the pile through the pile driving mechanism. One device completes the hole formation and pile planting, improving the construction efficiency.

[0008] Furthermore, the drill rod includes two or more drill rod sections that are telescopically fitted together in sequence, and the cutting and stirring drill bit is installed at one end of one drill rod section; in the two drill rod sections fitted together, the end of one drill rod section is slidably connected to the side wall of the other drill rod section through a sealing element.

[0009] Furthermore, in the two drill pipe sections that are fitted together, the inner wall of the outer drill pipe section is provided with a first anti-rotation part that extends a predetermined length from one end to the other along the length direction of the drill pipe, and the outer wall of the end of the inner drill pipe section is provided with a second anti-rotation part that cooperates with the first anti-rotation part and can slide relative to each other along the length direction. The first anti-rotation part and the second anti-rotation part cooperate to prevent rotation in the circumferential direction.

[0010] Furthermore, the first anti-rotation part and the second anti-rotation part are polygonal mating structures or keyway mating structures with circumferential anti-rotation.

[0011] Furthermore, the sealing element includes an oil seal seat and an oil seal installed in the oil seal seat. In the two drill pipe sections that are fitted together, at least one oil seal seat is provided on the inner side of the end of the outer drill pipe section, and the outer wall of the inner drill pipe section is in a sliding seal fit with the oil seal.

[0012] Furthermore, in the two drill pipe sections that are fitted together, the second anti-rotation part is located inside the outer drill pipe section.

[0013] Furthermore, at least the drill rod section connected to the cutting and stirring drill bit has a limiting stop on its side wall to prevent the upper drill rod section from overtraveling, and the limiting stop is located above the first discharge port.

[0014] Furthermore, the drill rod has a built-in material conveying pipe;

[0015] The conveying pipe forms the conveying channel and is connected to the first discharge port, or the conveying pipe and at least part of the inner cavity of the drill rod section connected to the cutting and stirring drill bit form the conveying channel, and the drill rod section connected to the cutting and stirring drill bit is connected to the first discharge port.

[0016] And / or, the conveying pipe includes two or more material pipe sections that are telescopically fitted together in sequence; or the conveying pipe is at least partially a flexible pipe; or the conveying pipe includes two or more material pipe sections whose ends are connected in sequence.

[0017] Furthermore, the conveying channel is equipped with a spiral feeding mechanism, which includes spiral conveying blades built into the conveying channel and a power unit for driving the spiral conveying blades to rotate.

[0018] And / or, the first discharge port and / or the liquid outlet are equipped with a one-way valve, wherein the one-way valve's unidirectional flow direction is from the inside of the injection and stirring mechanism to the outside of the injection and stirring mechanism.

[0019] Furthermore, the pile frame is vertically mounted with two or more transverse movement mechanisms that allow the pile driving mechanism and the grouting and mixing mechanism to reciprocate laterally.

[0020] The lateral movement mechanism includes a lateral movement guide rail, two lateral movement mounting seats that move laterally along the lateral movement guide rail and are used to install the pile driving mechanism and the grouting and mixing mechanism respectively, and a lateral movement braking assembly installed on the lateral movement mounting seats.

[0021] Furthermore, the lateral braking assembly includes two opposing connecting arms that are respectively hinged to the lateral mounting base, a braking power source for driving the connecting arms to deflect, and a brake shoe disposed at one end of the connecting arm and adapted to the lateral guide rail, wherein each brake shoe is connected to a connecting arm.

[0022] Furthermore, the transverse mounting base is provided with transverse pulleys that slide in conjunction with the transverse guide rail.

[0023] Furthermore, the pile driving mechanism also includes an auxiliary pile clamp located below and vertically aligned with the main pile clamp, the auxiliary pile clamp having a pile clamping channel for the precast pile to pass through; the auxiliary pile clamp includes a support frame mounted on one of the transverse mounting bases and a pile driving guide clamping assembly mounted on the support frame;

[0024] The pile frame has an auxiliary transverse rail parallel to the transverse guide rail, and the bearing frame has an auxiliary transverse wheel that reciprocates laterally along the auxiliary transverse rail;

[0025] And / or, the pile driving guide clamping assembly includes a guide assembly and a clamping assembly mounted on the support frame and coaxially arranged. The guide assembly is located above the clamping assembly. The guide assembly includes a guide seat mounted on the support frame and a guide wheel mounted on the guide seat. The clamping assembly includes a positioning clamping member mounted on the support frame, a movable clamping member mounted on the support frame, and a clamping drive member that drives the movable clamping member to move toward or away from the positioning clamping member.

[0026] Furthermore, the cutting and stirring drill bit also includes a chain frame and at least one transmission chain mounted on the chain frame and capable of rotating circumferentially or reciprocating on the chain frame;

[0027] The links of the transmission chain are equipped with multiple cutting components that protrude outward from the transmission chain, and the chain frame is provided with a scraping component near the cutting components above the top of the transmission chain.

[0028] And / or, the chain conveyor is equipped with a feeding pipe for conveying building particles and a second discharge port connected to the feeding pipe, the feeding pipe being connected to the conveying channel;

[0029] And / or, the pile driving mechanism further includes a lifting mechanism, the lifting mechanism including a lifting slide rail installed on the transverse mounting base and a lifting mounting base that reciprocates vertically along the lifting slide rail, and the main pile clamp is installed on the lifting mounting base.

[0030] And / or, the material mixing mechanism further includes a lifting mechanism, the lifting mechanism including a lifting slide rail mounted on the transverse mounting base and a lifting mounting base that reciprocates vertically along the lifting slide rail, and the drill rod is mounted on the lifting mounting base.

[0031] And / or, the injection mixing mechanism further includes a drill rod straightening assembly mounted on the pile frame, the drill rod straightening assembly having a through hole through which the drill rod passes. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a three-dimensional structural schematic diagram of the composite pile driver in an embodiment of the present invention;

[0034] Figure 2 yes Figure 1 An enlarged schematic diagram of part A in the middle;

[0035] Figure 3 yes Figure 1 Enlarged schematic diagram of part B in the middle;

[0036] Figure 4 yes Figure 1 An enlarged schematic diagram of section C;

[0037] Figure 5 This is a three-dimensional structural diagram of the material injection and stirring mechanism in an embodiment of the present invention;

[0038] Figure 6 yes Figure 5 An enlarged schematic diagram of section D in the middle;

[0039] Figure 7 yes Figure 5 An enlarged schematic diagram of section E in the middle;

[0040] Figure 8 This is a cross-sectional view of the drill pipe in an embodiment of the present invention;

[0041] Figure 9 This is a cross-sectional view of a portion of the material mixing mechanism in an embodiment of the present invention;

[0042] Figure 10 yes Figure 9 Enlarged schematic diagram of section F in the middle;

[0043] Figure 11 yes Figure 9 Enlarged schematic diagram of section G in the middle;

[0044] Figure 12 This is a top view of a drill pipe according to an embodiment of the present invention;

[0045] Figure 13 This is a top view of another drill pipe in an embodiment of the present invention;

[0046] Figure 14 This is a three-dimensional structural diagram of a portion of the pile driving mechanism in an embodiment of the present invention;

[0047] Figure 15 This is a three-dimensional structural diagram of the auxiliary pile clamp in an embodiment of the present invention;

[0048] Figure 16 This is a three-dimensional structural diagram of the auxiliary pile clamping device in an embodiment of the present invention.

[0049] Attached reference numerals: 10. Pile frame; 11. Auxiliary transverse rail; 12. Pile driver moving platform; 121. Large mobile vessel; 122. Small mobile vessel; 13. Pile driver frame;

[0050] 20. Pile driving mechanism; 20a. Pile clamping channel; 1. Main pile clamp; 1a. Vibrator; 1b. Pile clamping assembly; 2. Auxiliary pile clamp; 21. Bearing frame; 211. Auxiliary transverse wheel; 22. Pile driving guide clamping assembly; 221. Guide assembly; 2211. Guide seat; 2212. Guide wheel; 222. Clamping assembly; 2221. Positioning clamping component; 2222. Movable clamping component; 2223. Clamping drive component;

[0051] 30. Injection and mixing mechanism; 31. Drill rod; 31a. Drill rod section; 311. First discharge port; 312. First anti-rotation part; 313. Second anti-rotation part; 314. Limiting stop; 315. Baffle; 316. End limiting structure; 32. Cutting and mixing drill bit; 321. Liquid outlet; 322. Chain frame; 323. Drive chain; 324. Cutting assembly; 3241. Columnar cutting body; 325. Sludge scraping assembly; 3251. Sludge scraper; 326. Second discharge port; 33. Drill rod straightening assembly;

[0052] 40. Conveying channel; 41. Material conveying pipe; 41a. Material pipe section;

[0053] 50. Sealing element; 51. Oil seal seat; 52. Oil seal;

[0054] 60. Screw feeding mechanism; 61. Screw conveyor blades; 62. Power unit;

[0055] 70. Check valve;

[0056] 80. Lateral movement mechanism; 81. Lateral movement guide rail; 82. Lateral movement mounting base; 83. Lateral movement braking assembly; 831. Connecting arm; 832. Braking power source; 833. Brake shoe; 84. Lateral movement pulley;

[0057] 90. Lifting mechanism; 91. Lifting slide rail; 92. Lifting mounting base. Detailed Implementation

[0058] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of the present invention, but not all embodiments.

[0059] In this document, terms such as "upper," "lower," "inner," and "outer" are established based on the positional relationships shown in the accompanying drawings. Depending on the drawings, the corresponding positional relationships may also change. Therefore, they should not be interpreted as an absolute limitation on the scope of protection. Moreover, relational terms such as "first" and "second" are only used to distinguish one component from another that has the same name, and do not necessarily require or imply any such actual relationship or order between these components.

[0060] Example 1

[0061] See Figure 1-16 This embodiment provides a composite pile driver, including: a pile frame 10, a pile driving mechanism 20 movably installed on the pile frame 10, and a material mixing mechanism 30. The pile driving mechanism 20 has a main pile clamp 1. The material mixing mechanism 30 includes a drill rod 31 and a cutting and mixing drill bit 32 installed at the bottom of the drill rod 31. The drill rod 31 has a built-in conveying channel 40 for conveying building particles, and the bottom of the drill rod 31 has a first discharge port 311 connected to the conveying channel 40. The cutting and mixing drill bit 32 has a liquid injection pipe with a liquid outlet 321. The vertical projection of the drill rod 31 is located within the vertical projection range of the cutting and mixing drill bit 32.

[0062] Specifically, firstly, liquid is delivered through the injection pipe inside the cutting and mixing drill bit 32, and liquid is added to the soil through the outlet 321 of the injection pipe to facilitate cutting and mixing of the soil by the cutting and mixing drill bit 32, thereby improving the drilling efficiency of the cutting and mixing drill bit 32. Secondly, dry building particles containing aggregate are delivered through the conveying channel 40 inside the drill rod 31 to reduce the moisture content of the composite pile, improve the pile consolidation efficiency, accelerate the construction progress, and improve the pile strength through the aggregate particles. Furthermore, the precast pile is clamped by the main pile clamp 1 of the pile driving mechanism 20 and inserted into the pile hole. That is, the composite pile machine of the present invention can first achieve cutting and mixing of the soil and conveying building particles to reinforce the soil through the injection and mixing mechanism 30, enhancing the overall applicability of the injection and mixing mechanism 30, avoiding separate operations for cutting and mixing and feeding, simplifying the construction operation, and then planting the pile through the pile driving mechanism 20. One device completes the hole formation and pile planting, improving the construction efficiency. In addition, the first discharge port 311 of the conveying channel 40 is located at the bottom of the drill rod 31, meaning that the building particles can be mixed by the cutting and mixing drill bit 32 after exiting from the first discharge port 311, ensuring uniform discharge and mixing, and guaranteeing the uniformity of the soil after reinforcement. Furthermore, the vertical projection of the drill rod 31 is within the vertical projection range of the cutting and mixing drill bit 32, so that during the drilling process of the drill rod 31 driving the cutting and mixing drill bit 32 down, the drill rod 31 only contacts the cut and mixed mud, and will not penetrate into the hard soil, reducing the resistance encountered by the drill rod 31 and facilitating the down-drilling of the cutting and mixing drill bit 32.

[0063] For details, please refer to Figure 1The pile frame 10 includes a pile driver mobile platform 12 and a pile driver frame 13 mounted on the pile driver mobile platform 12. The pile driver mobile platform 12 is mainly used to move the pile driver frame 13 and the equipment on the pile driver frame 13 to different construction positions to facilitate construction at the next construction position. The pile driver mobile platform 12 includes a large mobile vessel 121 and a small mobile vessel 122, which are connected by a connecting beam. Both the large mobile vessel 121 and the small mobile vessel 122 can move longitudinally relative to the connecting beam. The large mobile vessel 121 can move the small mobile vessel 122 and the pile driver frame 13 laterally, and the small mobile vessel 122 can move the large mobile vessel 121 and the pile driver frame 13 longitudinally. The small mobile vessel 122 can also turn the large mobile vessel 121 and the pile driver frame 13. The pile driving mechanism 20 and the grouting and mixing mechanism 30 are movably mounted on the pile driver frame 13. After the drill rod 31 drives the cutting and mixing drill bit 32 to drill down, cut and mix the soil, and inject building particles into the soil, the main pile clamp 1 of the pile driving mechanism 20 can move downward relative to the pile driver frame 13 to insert the precast pile it clamps into the pile hole. Preferably, the main pile clamp 1 includes a vibration structure to facilitate the insertion of the precast pile into the pile hole. More specifically, when the drill rod 31 drives the cutting and mixing drill bit 32 to drill down and cut and mix the soil, the cutting and mixing drill bit 32 first delivers liquid through the injection pipe and injects liquid into the soil through the liquid outlet 321 to facilitate the cutting and mixing drill bit 32 to drill down and mix the soil. The liquid can be water or slurry. The slurry can be a liquid mixed with one or more of the following substances: mud, sand, cement, adhesive, gelling agent, curing agent, and expanding agent. When the cutting and mixing drill bit 32 cuts and mixes the soil, dry building particles are conveyed into the soil through the conveying channel 40. The building particles and soil are mixed while the soil is being cut. Alternatively, after the cutting and mixing drill bit 32 has completed cutting and mixing the soil, dry building particles are conveyed into the soil through the conveying channel 40, and then the cutting and mixing drill bit 32 continues to mix the building particles and soil. The choice is made according to the construction scenario and requirements, and there is no specific limitation. The drill rod 31 is vertical in length, and the pile driving mechanism 20 and the grouting and mixing mechanism 30 are installed side by side on the pile frame 10 in the transverse direction. The direction perpendicular to the transverse and vertical directions is the longitudinal direction.

[0064] Furthermore, the drill rod 31 can be a long drill rod 31, a telescopic drill rod, or a butt joint drill rod; there is no specific limitation, and the selection is based on the depth of the pile hole during construction. For example... Figure 8 and Figure 9 The drill rod 31 shown is a telescopic drill rod.

[0065] Furthermore, injecting dry construction particles into the pile hole can increase the density and strength of the soil within the pile hole, accelerating the improvement of pile strength. Construction particles include particulate matter such as powder, sand and gravel aggregates, and recycled aggregates. Among them, the particle size of the powder is less than or equal to 100 micrometers; the particulate matter includes fine particles with a particle size less than or equal to 4.75 millimeters and coarse particles with a particle size less than or equal to 40 millimeters. Powders include one or more of the following: cement powder, fly ash, lime, gypsum powder, stone powder, ceramic powder, slag powder, furnace slag powder, coal slag powder, steel slag powder, silica fume, and wood ash. Sand and gravel aggregates include crushed stone, sand, slag, pebbles, bricks, and tiles. Recycled aggregates mainly refer to construction waste. Construction particles also include a small amount of one or more of the following: water-absorbing agents, early-strength agents, activators, and dispersants. Water-absorbing agents include one or more combinations of expanding resin, water-absorbing resin, saponified slag, and diatomaceous earth. The strengthening agent includes one or more of the following: kaolin, calcium chloride, aluminum chloride, water glass, glass fiber, calcium acetate, triisopropanolamine, sodium formate, and potassium nitrate. The activator includes one or more of the following: sodium hydroxide, sodium silicate, magnesium oxide, calcium oxide, and halides, sulfates, and aluminates. The dispersant includes one or more of the following: naphthalene sulfonate formaldehyde condensate high-efficiency water-reducing agent powder, melamine-formaldehyde resin powder or sulfonated coumarone resin powder, and polyethylene wax. Furthermore, the building particles include components that adhere the powder to the surface of sand and gravel aggregates and / or recycled aggregates, such as slag, silica fume, or red mud, to prevent separation of the powder from the aggregate during its descent within the conveying channel 40 due to density differences, thus preventing building particle segregation.

[0066] The composition, proportion, and dosage of the building particles are determined comprehensively based on factors such as the soil conditions and construction requirements of the foundation to be treated. In this embodiment, the building particles include the following components by weight: 17-30 parts cement, 10-15 parts desulfurized gypsum, 10-15 parts quicklime, and 40-63 parts construction waste. The building particles may also include an early-strength agent, which is beneficial for rapidly improving the strength of the pile body. The weight ratio of the early-strength agent to cement is (0.04-0.08):1. The building particles also include dry soil, with a weight ratio of dry soil to dry concrete material of (2.6-3.6):1. Injecting dry soil helps reduce the water content in the pile hole. Dry soil is low in cost, easy to obtain, and by adjusting the amount of dry soil injected, the water content of the soil in the pile hole can be reduced, which helps to reduce the dosage of building particles, facilitates the adjustment of the composition and proportion of building particles, makes the water reduction results highly controllable, and is economical and environmentally friendly.

[0067] Example 2

[0068] In this embodiment, the parts that are the same as in Embodiment 1 are given the same reference numerals, and the same text descriptions are omitted.

[0069] Compared to Embodiment 1, the composite pile driver provided in this embodiment has the following structural design differences:

[0070] See Figure 8-11 The drill rod 31 includes two or more drill rod sections 31a that can be telescopically fitted together in sequence. The cutting and stirring drill bit 32 is installed at one end of a drill rod section 31a. Depending on the length of the drill rod 31 and the construction requirements, two, three, or four or more drill rod sections 31a can be telescopically fitted together in sequence. There is an end limiting structure 316 between two adjacent drill rod sections 31a to prevent the two drill rod sections 31a from directly separating when the drill rod 31 extends, and to facilitate the lower drill rod section 31a to lift the upper drill rod section when the drill rod 31 retracts.

[0071] Further, see Figure 8-9 In the two drill pipe sections 31a that are fitted together, the end of one drill pipe section 31a is slidably connected to the side wall of the other drill pipe section 31a via a seal 50, to prevent mud from entering between the two fitted drill pipe sections 31a and affecting the extension or contraction of the drill pipe 31. See also Figure 11 Preferably, the sealing element 50 includes an oil seal seat 51 and an oil seal 52 installed within the oil seal seat 51. In the two fitted drill pipe sections 31a, the inner end of the outer drill pipe section has at least one oil seal seat 51. The outer wall of the inner drill pipe section slides in a sealing fit with the oil seal 52. The oil seal 52 of the oil seal seat 51 on the outer drill pipe section always abuts against the outer wall of the inner drill pipe section, thereby ensuring that no mud enters between the outer and inner drill pipe sections. Preferably, the end limiting structure 316 of the outer drill pipe section is located between the end limiting structure 316 of the inner drill pipe section and the sealing element 50 to prevent the end limiting structure 316 of the inner drill pipe section from colliding with the oil seal seat 51 when the drill pipe 31 extends. Preferably, the inner end of the outer drill pipe section has a double-layer oil seal seat 51.

[0072] Further, see Figure 8-13In the two drill rod sections 31a fitted together, the inner wall of the outer drill rod section is provided with a first anti-rotation part 312 extending a predetermined length from one end of the drill rod 31 to the other. Preferably, the first anti-rotation part 312 extends from the end limiting structure 316 away from the oil seal seat 51 to the end. The outer wall of the end of the inner drill rod section is provided with a second anti-rotation part 313 that cooperates with the first anti-rotation part 312 and can slide relative to it along the length direction. Preferably, the second anti-rotation part 313 extends from the end limiting structure 316 away from the oil seal seat 51 to the end. Preferably, the second anti-rotation part 313 is the end limiting structure 316. The first anti-rotation part 312 and the second anti-rotation part 313 cooperate in a circumferential anti-rotation manner, which can ensure that the shape of the pile hole formed by the cutting and mixing drill bit 32 is similar to the shape of the cutting and mixing drill bit 32, and is suitable for making piles with various cross-sectional shapes, especially for making piles with rectangular cross-sections. Preferably, the first anti-rotation part 312 and the second anti-rotation part 313 are circumferential anti-rotation polygonal mating structures or keyway mating structures. For details, please refer to Figure 13 The first anti-rotation part 312 and the second anti-rotation part 313 can be adapted polygonal structures, such as protrusions or recesses with hexagonal or octagonal cross-sections, or, please refer to Figure 12 The first anti-rotation part 312 and the second anti-rotation part 313 are adapted keyways and key bars, such as the anti-rotation fit of a spline groove and a spline. Alternatively, one of the first anti-rotation part 312 and the second anti-rotation part 313 can be set as a polygonal structure, and the other of the first anti-rotation part 312 and the second anti-rotation part 313 can be set with a corresponding protrusion, which can also achieve the anti-rotation effect between two adjacent drill pipe sections 31a.

[0073] Furthermore, in the two drill pipe sections 31a that are fitted together, the second anti-rotation part 313 is located inside the outer drill pipe section, and the second anti-rotation part 313 of the inner drill pipe section is always located inside the outer drill pipe section when the drill pipe 31 is extended. This can prevent the second anti-rotation part 313 from interfering with the seal 50 at the end of the outer drill pipe section and affecting the seal between the outer drill pipe section and the inner drill pipe section.

[0074] Further, see Figure 5 , Figure 8-9 At least the drill rod section 31a connected to the cutting and stirring drill bit 32 has a limit stop 314 on its side wall to stop the upper drill rod section from extending too far. The limit stop 314 is located above the first discharge port 311. The limit stop 314 controls the degree of retraction of the upper drill rod section to prevent the upper drill rod section from blocking the first discharge port 311 when it has not extended.

[0075] Further, see Figure 5 , Figure 9The drill rod 31 has a built-in feed pipe 41. The feed pipe 41 can be composed of two or more feed pipe sections 41a that are telescopically fitted together in sequence. It can extend as the drill rod 31 extends. The number of feed pipe sections 41a can be adjusted according to actual use, such as three or four or more. Using telescopically fitted feed pipe sections 41a can avoid the problem of a single feed pipe 41 being too long and difficult to operate and transport. The telescopically fitted feed pipe sections 41a are convenient for transportation and use. The feed pipe 41 can also be at least partially flexible. When the drill rod 31 retracts, the feed pipe 41 is in a non-extended state. When the drill rod 31 extends, the feed pipe 41 can be stretched and extended. The feed pipe 41 can also be composed of two or more feed pipe sections 41a that are connected at their ends in sequence. The length of the feed pipe sections 41a is extended to match the length of the drill rod 31. A sealing ring is provided at the connection between the two feed pipe sections 41a.

[0076] Further, see Figure 5 , Figure 9 The conveying pipe 41 forms a conveying channel 40 and is connected to the first discharge port 311. Alternatively, the conveying pipe 41 and at least part of the inner cavity of the drill rod section 31a connected to the cutting and stirring drill bit 32 are connected to form a conveying channel 40. The drill rod section 31a connected to the cutting and stirring drill bit 32 is connected to the first discharge port 311. That is, part of the inner cavity of the drill rod section 31a connected to the cutting and stirring drill bit 32 is part of the conveying channel 40. Since the conveying pipe 41 is placed inside the drill rod 31, the diameter of the conveying pipe 41 must be smaller than the diameter of the drill rod 31. The partial inner cavity of the drill rod section 31a connected to the cutting and stirring drill bit 32 forming a partial conveying channel 40 can increase the amount of building particles at the first discharge port 311, enhance the extrusion pressure at the first discharge port 311, accelerate the discharge, and improve the discharge efficiency.

[0077] Further, see Figure 9-11 The conveying channel 40 is equipped with a spiral feeding mechanism 60, which includes spiral conveying blades 61 built into the conveying channel 40 and a power unit 62 that drives the spiral conveying blades 61 to rotate. The rotation of the spiral conveying blades 61 provides a force to the building particles in the conveying channel 40 to move towards the first discharge port 311, thereby preventing material blockage in the conveying channel 40, accelerating the discharge, and improving the discharge efficiency. Preferably, the drill rod 31 is provided with a baffle 315 with a through hole above the spiral feeding mechanism 60 to prevent the conveying pipe 41 or the drill rod section 31a from colliding with the spiral feeding mechanism 60 when the drill rod 31 retracts. The baffle 315 can also lift the conveying pipe 41 inside the drill rod 31 when the drill rod 31 retracts.

[0078] Further, see Figure 5 , Figure 7The first discharge port 311 and / or the liquid outlet 321 are equipped with a one-way valve 70. The one-way valve 70 has a one-way flow direction from the inside of the injection and mixing mechanism 30 to the outside of the injection and mixing mechanism 30, so as to prevent water or slurry from entering the conveying channel 40 from the first discharge port 311 when the cutting and mixing drill bit 32 is drilling, and to prevent water or slurry from entering the injection and mixing mechanism 30 from the liquid outlet 321 when the cutting and mixing drill bit 32 is drilling, thereby avoiding affecting the normal use of the pile drilling tool.

[0079] Example 3

[0080] In this embodiment, the parts that are the same as in Embodiments 1 and 2 are given the same reference numerals, and the same text descriptions are omitted.

[0081] Compared to Embodiments 1 and 2, the composite pile driver provided in this embodiment has the following structural design differences:

[0082] See Figure 1 The pile frame 10 has two or more transverse moving mechanisms 80 installed side-by-side vertically, allowing the pile driving mechanism 20 and the grouting and mixing mechanism 30 to move laterally back and forth. By installing two or more transverse moving mechanisms 80 side-by-side vertically, the pile driving mechanism 20 and the grouting and mixing mechanism 30 can move stably on the transverse moving mechanisms 80. Preferably, at least one transverse moving mechanism 80 is provided at the upper vertical part of the pile driving mechanism 20 and the grouting and mixing mechanism 30, and another transverse moving mechanism 80 is provided at the lower vertical part of the pile driving mechanism 20 and the grouting and mixing mechanism 30, so that the pile driving mechanism 20 and the grouting and mixing mechanism 30 installed on the transverse moving mechanisms 80 can move laterally stably. For details, see [link to details]. Figure 2 , Figure 4 The lateral movement mechanism 80 includes a lateral movement guide rail 81, two lateral movement mounting seats 82 that reciprocate laterally along the lateral movement guide rail 81 and are used to respectively mount the pile driving mechanism 20 and the grouting and mixing mechanism 30, and a lateral movement braking assembly 83 mounted on the lateral movement mounting seats 82. The lateral movement braking assembly 83 brakes the lateral movement mounting seats 82 that move along the lateral movement guide rail 81, thereby limiting the position of the lateral movement mounting seats 82 on the lateral movement guide rail 81, so that the pile driving mechanism 20 mounted on the lateral movement mounting seats 82 is positioned above the pile hole or the grouting and mixing mechanism 30 is positioned in the construction position. The lateral movement mechanism 80 also includes a drive structure for driving the lateral movement mounting seats 82 to move laterally along the lateral movement guide rail 81. There are many existing drive structures, which will not be described in detail here.

[0083] Among them, see Figure 1 The transverse moving mechanisms 80 arranged side by side along the vertical direction can be a first transverse moving mechanism 80 and a second transverse moving mechanism 80 with different structures, see [reference]. Figure 2 The first lateral movement mechanism 80 has a lateral movement guide rail 81, which can be the mast of the pile driver frame 13. The lateral movement mounting base 82 is clamped on the lateral movement guide rail; see also Figure 4The second transverse movement mechanism 80 has a transverse movement guide rail 81 that is an I-beam rail, and a transverse movement mounting base 82 that includes a transverse movement trolley. Of course, the transverse movement mechanisms 80 arranged side by side along the vertical direction can also have the same structure, without specific limitations, as long as they can allow the pile driving mechanism 20 and the grouting and mixing mechanism 30 to move laterally back and forth.

[0084] Further, see Figure 2 The lateral braking assembly 83 includes two opposing connecting arms 831 hinged to the lateral mounting base 82, a braking power source 832 for driving the connecting arms 831 to deflect, and brake shoes 833 disposed at one end of the connecting arms 831 and adapted to the lateral guide rail 81, wherein each brake shoe 833 is connected to a connecting arm 831. The braking power source 832 drives the connecting arms 831 to rotate, so that the connecting arms 831 drive the brake shoes 833 to move in a direction close to the lateral guide rail 81. The friction between the brake shoes 833 and the lateral guide rail 81 stops the moving lateral mounting base 82. Preferably, the brake shoes 833 are clamped on both sides of the lateral guide rail 81 so that the brake shoes 833 can smoothly brake the lateral mounting base 82.

[0085] Further, see Figure 2 The transverse mounting base 82 is provided with a transverse pulley 84 that slides in conjunction with the transverse guide rail 81, which reduces the friction between the transverse mounting base 82 and the transverse guide rail 81 and facilitates the movement of the transverse mounting base 82 along the transverse guide rail 81.

[0086] Further, see Figure 1 , Figure 14 The main pile clamp 1 includes a vibrator 1a and a pile clamping assembly 1b connected to the vibrator 1a. The pile clamping assembly 1b includes a pile clamping member and a pile clamping drive member that drives the pile clamping member to contract or expand. The pile clamping drive member can be a drive cylinder or a drive motor. The pile clamping member can be a clamping arm arranged opposite to each other, or the pile clamping member includes a positioning pile clamping member and a movable pile clamping member. Both the positioning pile clamping member and the movable pile clamping member have grooves that are adapted to the shape of the precast pile. Guided by the positioning pile clamping member, the pile clamping drive member connects to and drives the movable pile clamping member to move away from or close to the positioning pile clamping member.

[0087] Further, see Figure 1 , Figure 15-16 The pile driving mechanism 20 also includes an auxiliary pile clamp 2 located below the main pile clamp 1 and vertically aligned. The auxiliary pile clamp 2 has a pile clamping channel 20a through which the precast pile passes. The auxiliary pile clamp 2 includes a support frame 21 mounted on the transverse mounting base 82 and a pile driving guide clamping assembly 22 mounted on the support frame 21. During pile driving, it is usually necessary to extend the precast piles. The lower precast pile is clamped by the pile driving guide clamping assembly 22, and the upper precast pile is clamped by the pile clamping component. The main pile clamp 1 can move downwards to connect the upper and lower precast piles.

[0088] Further, see Figure 1 , Figure 15-16 The pile frame 10 has an auxiliary transverse rail 11 parallel to the transverse guide rail 81, and the bearing frame 21 has an auxiliary transverse wheel 211 that moves laterally along the auxiliary transverse rail 11 so that when the transverse mounting seat 82, on which the pile driving mechanism 20 is installed, moves along the transverse guide rail 81, the auxiliary pile clamp 2 can also smoothly follow the transverse mounting seat 82 to move laterally.

[0089] Further, see Figure 15-16 The pile driving guide and clamping assembly 22 includes a guide assembly 221 and a clamping assembly 222, both mounted on the support frame 21 and coaxially arranged. Both the guide assembly 221 and the clamping assembly 222 have channels for the precast piles to pass through. Coaxial arrangement means that the channels formed by the guide assembly 221 and the clamping assembly 222 are connected along the same axis. The guide assembly 221 is located above the clamping assembly 222. The support frame 21 has a double-layer installation platform; the guide assembly 221 is installed on the upper installation platform, and the clamping assembly 222 is installed on the lower installation platform. The channel of the clamping assembly 222 is the pile clamping channel 20a. The lower precast pile is clamped by the clamping assembly 222, and the lower end of the precast pile clamped by the main pile clamp 1 is guided by the guide assembly 221 to make the two precast piles coaxial, thereby enabling the two precast piles to be smoothly connected. Specifically, the guide assembly 221 may include a guide seat 2211 mounted on the support frame 21 and a guide wheel 2212 mounted on the guide seat 2211. The guide seat 2211 is inclined relative to the precast pile insertion direction on the side facing the pile clamping channel 20a to form a guide surface for the precast pile. The guide wheel 2212 reduces the friction between the guide assembly 221 and the precast pile, facilitating the movement of the upper precast pile towards the lower precast pile for docking. Of course, the guide assembly 221 may also only include the guide seat 2211 mounted on the support frame 21. The guide wheel 2212 may be installed on the support frame 21; the clamping assembly 222 includes a positioning clamping member 2221 installed on the support frame 21, a movable clamping member 2222 installed on the support frame 21, and a clamping drive member 2223. The clamping drive member 2223 is installed on the support frame 21 or the positioning clamping member 2221. Guided by the positioning clamping member 2221, the clamping drive member 2223 drives the movable clamping member 2222 to move towards or away from the positioning clamping member 2221 to reduce or expand the pile clamping channel 20a.

[0090] Further, see Figure 1 , Figure 3The pile driving mechanism 20 also includes a lifting mechanism 90. The lifting mechanism 90 includes a lifting slide rail 91 mounted on the transverse mounting base 82 and a lifting mounting base 92 that reciprocates vertically along the lifting slide rail 91. The main pile clamp 1 is mounted on the lifting mounting base 92. The main pile clamp 1 can follow the lifting mounting base 92 and reciprocate vertically along the lifting slide rail 91, so that when the pile is driven and the pile is connected, the main pile clamp 1 can drive the precast pile to descend towards the pile hole, and the main pile clamp 1 can rise and reset. The main pile clamp 1 is connected to a drive structure that drives the main pile clamp 1 to rise and fall. This drive structure can be a drive cylinder or a rope traction structure set at the upper end of the lifting slide rail 91. There is no specific limitation, as long as the main pile clamp 1 can move vertically reciprocatingly along the lifting slide rail 91 in a controlled manner.

[0091] Furthermore, the grouting and mixing mechanism 30 can be directly installed on the pile frame 10. The drill rod 31 is a telescopic drill rod 31, connected to a drill rod 31 drive that drives the drill rod 31 to extend. The drill rod 31 drive can extend the drill rod 31, causing the cutting and mixing drill bit 32 to move towards the soil near the construction position for cutting, mixing, and grouting. A pulley assembly is provided at the upper end of the innermost section of the drill rod 31. The drill rod 31 drive can be a wire rope or steel strand that can pass through the pulley assembly and connect to external lifting equipment such as a winch, thereby realizing the lifting of the drill rod 31. It is understood that telescopic devices such as telescopic cylinders can also be used to realize the extension and retraction of the drill rod 31. There are many ways to achieve this, which will not be elaborated here. See Figure 1 The preferred material mixing mechanism 30 also includes a lifting mechanism 90. The lifting mechanism 90 includes a lifting slide rail 91 installed on the transverse mounting base 82 and a lifting mounting seat 92 that moves vertically back and forth along the lifting slide rail 91. The drill rod 31 is installed on the lifting mounting seat 92. The drill rod 31 can follow the lifting mounting seat 92 and move vertically back and forth along the lifting slide rail 91. When it is necessary to cut and mix shallow soil, the lifting mounting seat 92 drives the drill rod 31 and the cutting and mixing drill bit 32 to move downward. When it is necessary to cut and mix deeper soil, the drill rod 31 extends to drive the cutting and mixing drill bit 32 to continue downward. This reduces the extension length of the drill rod 31 and avoids the drill rod 31 from breaking due to excessive length or affecting the cutting and mixing of the cutting and mixing drill bit 32.

[0092] Further, see Figure 1 The grouting and mixing mechanism 30 also includes a drill rod straightening assembly 33 installed on the pile frame 10. The drill rod straightening assembly 33 has a through hole through which the drill rod 31 passes. The drill rod 31 is straightened by the drill rod straightening assembly 33 to prevent the drill rod 31 from deviating from the predetermined hole position or tilting into the soil during the drilling process of the cutting and mixing drill bit 32, which would affect the insertion of the precast pile and the performance of the formed composite pile.

[0093] Example 4

[0094] In this embodiment, the parts that are the same as in Embodiments 1, 2, and 3 are given the same reference numerals, and the same text descriptions are omitted.

[0095] Compared to Embodiments 1, 2, and 3, the composite pile driver provided in this embodiment has the following structural design differences:

[0096] See Figure 5 The cutting and mixing drill bit 32 includes a chain frame 322 and at least one transmission chain 323 mounted on the chain frame 322 and capable of circumferential rotation or reciprocating oscillation on the chain frame 322. Multiple cutting components 324 protruding from the transmission chain 323 are mounted on the chain links of the transmission chain 323. A chain drive mechanism is provided between the transmission chain 323 and the chain frame 322 to drive the transmission chain 323 to circumferentially rotate or reciprocate on the chain frame 322. The chain drive mechanism drives the cutting components 324 on the transmission chain 323 to circumferentially rotate or reciprocate, enabling the cutting components 324 to cut the soil. Simultaneously, the drill rod 31 applies downward pressure to the cutting and mixing drill bit 32, causing the cutting and mixing drill bit 32 to cut downwards in the soil at a suitable speed until a specified depth is reached, after which it is pulled back.

[0097] Furthermore, in actual production processes, existing drill bits generally use plate-shaped or strip-shaped cutting bodies to cut the soil. The effective cutting surface of a plate-shaped or strip-shaped cutting body is the plane that cuts into the soil at one end, resulting in a relatively small effective cutting range. This leads to a small volume of soil that the cutting body can cut in one pass, causing the drill bit to have a slow cutting efficiency. In this embodiment, see... Figure 5-7The cutting assembly 324 includes at least one cylindrical cutting body 3241 facing away from the drive chain 323. When cutting soil, the cylindrical cutting body 3241 has a large effective cutting range, thus enabling it to cut a larger volume of soil in a single cut, improving the efficiency of the cutting assembly 324 in cutting soil and enhancing the working efficiency of the cutting and mixing drill bit 32. Specifically, the cross-sectional shape of the cylindrical cutting body 3241 can be rhomboid, circular, elliptical, pentagonal, etc., with the specific selection depending on the actual situation. The following explanation uses a rhomboid cutting column as an example. The effective cutting range height of the rhomboid cutting column is its height, and its width is the width of its cross-section. In this embodiment, the width of the cross-section of the rhomboid cutting column is greater than the width of a plate-shaped or strip-shaped cutting body of the same height. Therefore, compared to a plate-shaped or strip-shaped cutting body of the same height, the effective cutting range of the rhomboid cutting column is larger. Existing plate-shaped or strip-shaped cutting elements have a small effective cutting range. To improve the efficiency of the cutting and stirring drill bit 32, the spacing between two adjacent plate-shaped or strip-shaped cutting elements is reduced. However, reducing the spacing between adjacent cutting elements makes it easy for soil to get stuck in the gap between the two adjacent cutting elements, increasing the descent resistance of the cutting and stirring drill bit 32 and reducing the efficiency of the drill bit. In this embodiment, the rhomboid cutting column has a large effective cutting range, so the number of cutting elements on the same cutting assembly 324 can be reduced. Of course, to improve the working efficiency of the cutting and stirring drill bit 32, multiple cylindrical cutting elements 3241 can be provided on the cutting assembly 324. Understandably, the effects achieved by other shaped cylindrical cutting elements 3241 are the same as or similar to those achieved by the rhomboid cutting column, and will not be elaborated here.

[0098] Preferably, the cylindrical cutting body 3241 also includes a cutting edge. Existing cutting bodies do not have a cutting edge. When cutting soil, cutting bodies without a cutting edge result in a larger volume of soil being cut, and the flow direction of the cut soil is transverse along the cutting surface. Furthermore, because cutting bodies are generally spaced apart, gaps exist between two adjacent cutting bodies, making it easy for the cut soil to get stuck in these gaps. This increases the resistance when the cutting and mixing drill bit 32 descends, reducing the drill bit's operating efficiency. In this embodiment, the outer contour of the cutting edge cross-section of the cylindrical cutting body 3241 is trapezoidal, V-shaped, semi-circular, or semi-elliptical, etc., and the specific shape is not limited, but selected according to the actual situation. The following explanation uses a V-shaped cutting edge cross-section as an example. When the cutting edge cross-section of the cylindrical cutting body 3241 is V-shaped, the tip of the cutting edge reduces the resistance experienced by the cylindrical cutting body 3241, making it easier to penetrate the soil. The V-shaped cutting edge has beveled sides. When the cylindrical cutting body 3241 enters the soil for cutting, the cut soil flows along the two beveled sides of the V-shaped cutting edge. At the same time, the cut soil is squeezed by the front end of the V-shaped cutting edge, cutting it into relatively small soil particles, reducing the volume of the soil. This prevents the soil from getting stuck on the cutting component 324 and does not affect the cutting efficiency of the drill bit. Understandably, the effect achieved by other shapes of cutting edges is the same or similar to that achieved by the V-shaped cutting edge, and will not be elaborated here.

[0099] Furthermore, during actual construction, the drill bit will encounter various soil environments. When the cutting component 324 of the cutting and mixing drill bit 32 operates in highly cohesive soil layers, a large amount of cohesive soil will adhere to the cutting component 324 or between two adjacent cutting components 324, increasing the resistance during the drill bit's descent and preventing the cutting component 324 from directly cutting the soil, thus affecting the drill bit's operating efficiency. To solve the above problems, in this embodiment, see... Figure 5-6 The chain frame 322 has a scraper assembly 325 above the top of the transmission chain 323, and the free end of the scraper assembly 325 is close to the cutting assembly 324 at the top of the transmission chain 323. When the transmission chain 323 is driven by the chain drive mechanism to rotate circumferentially or oscillate back and forth in the chain frame 322, the scraper assembly 325 scrapes off the clay adhering to the cutting assembly 324. Specifically, by setting up the scraper assembly 325, during the operation of the cutting and mixing drill bit 32, the scraper assembly 325 scrapes off the clay that rotates to the top of the transmission chain 323 or between adjacent cutting assemblies 324, reducing the resistance when the cutting assembly 324 enters the soil. At the same time, after the clay is removed, the cutting assembly 324 is exposed, ensuring that the cutting assembly 324 of the drill bit can directly cut the soil, improving the efficiency of the cutting assembly 324 in cutting the soil and ensuring the working efficiency of the drill bit.

[0100] Further, see Figure 6 The scraper assembly 325 includes at least one scraper blade 3251. The thickness direction of the scraper blade 3251 is parallel to or perpendicular to the width direction of the chain link. The free end of the scraper blade 3251 is one or a combination of several of the following shapes: plate-shaped, toothed, strip-shaped, and comb-shaped. This design facilitates installation and ensures the efficiency of the scraper assembly 325. When installed, the thickness direction of the scraper blade 3251 is parallel to or perpendicular to the width direction of the chain link. This ensures that the scraper blade 3251 provides sufficient resistance to scrape off the adhering mud without affecting the installation strength of the scraper assembly 325 on the chain frame 322, preventing it from falling off during operation.

[0101] Further, see Figure 5 The chain frame 322 is equipped with a feeding pipe for conveying building particles and a second discharge port 326 connected to the feeding pipe. The feeding pipe is connected to the conveying channel 40. The material is injected into the pile hole through the first discharge port 311 and the second discharge port 326 to improve the injection efficiency and the uniformity of the injection.

[0102] Without contradicting the spirit and technical means of this invention, at least some of the technical implementation methods in Embodiments 1 to 4 can be combined or replaced.

[0103] The above are merely preferred embodiments of the present invention. The scope of protection of the present invention shall be determined by the scope defined in the claims. Any improvements and modifications made by those skilled in the art without departing from the spirit and scope of the present invention shall also be considered as within the scope of protection of the present invention.

Claims

1. A composite pile driver, characterized in that, include: The pile frame (10), the pile driving mechanism (20) movably installed on the pile frame (10), and the grouting and mixing mechanism (30) are provided. The pile driving mechanism (20) has a main pile clamp (1). The grouting and mixing mechanism (30) includes a drill rod (31) and a cutting and mixing drill bit (32) installed at the bottom of the drill rod (31). The drill rod (31) has a built-in conveying channel (40) for conveying building particles. The bottom of the drill rod (31) is provided with a first discharge port (311) that connects to the conveying channel (40). The cutting and mixing drill bit (32) is provided with a liquid injection pipe. The liquid injection pipe has a liquid outlet (321). The vertical projection of the drill rod (31) is located within the vertical projection range of the cutting and mixing drill bit (32). The pile frame (10) has two or more transverse moving mechanisms (80) installed side by side in the vertical direction for the reciprocating movement of the pile driving mechanism (20) and the grouting and mixing mechanism (30); The transverse mechanism (80) includes a transverse guide rail (81), two transverse mounting seats (82) that move laterally along the transverse guide rail (81) and are used to install the pile driving mechanism (20) and the grouting and mixing mechanism (30) respectively, and a transverse braking assembly (83) installed on the transverse mounting seat (82). The pile driving mechanism (20) further includes an auxiliary pile clamp (2) located below and vertically aligned with the main pile clamp (1), the auxiliary pile clamp (2) having a pile clamping channel (20a) through which the precast pile passes; the auxiliary pile clamp (2) includes a support frame (21) mounted on a transverse mounting base (82) and a pile driving guide clamping assembly (22) mounted on the support frame (21).

2. The composite pile driver according to claim 1, characterized in that, The drill rod (31) includes two or more drill rod sections (31a) that are telescopically fitted together in sequence. The cutting and stirring drill bit (32) is installed at one end of one drill rod section (31a). Among the two drill rod sections (31a) that are fitted together, the end of one drill rod section (31a) is slidably connected to the side wall of the other drill rod section (31a) through a sealing element (50).

3. The composite pile driver according to claim 2, characterized in that, In the two drill pipe sections (31a) that are fitted together, the inner wall of the outer drill pipe section is provided with a first anti-rotation part (312) that extends a predetermined length from one end of the drill pipe (31) to the other end, and the outer wall of the end of the inner drill pipe section is provided with a second anti-rotation part (313) that cooperates with the first anti-rotation part (312) and can slide relative to each other along the length direction. The first anti-rotation part (312) and the second anti-rotation part (313) cooperate to prevent rotation in the circumferential direction.

4. The composite pile driver according to claim 3, characterized in that, The first anti-rotation part (312) and the second anti-rotation part (313) are polygonal mating structures or keyway mating structures with circumferential anti-rotation; And / or, the seal (50) includes an oil seal seat (51) and an oil seal (52) installed in the oil seal seat (51). In the two drill pipe sections (31a) that are fitted together, at least one oil seal seat (51) is provided on the inner side of the end of the outer drill pipe section, and the outer wall of the inner drill pipe section is in a sealing sliding fit with the oil seal (52). And / or, in the two drill pipe sections (31a) of the set, the second anti-rotation part (313) is located inside the outer drill pipe section; And / or, at least the drill rod section (31a) connected to the cutting and stirring drill bit (32) has a limiting stop (314) on its side wall to stop the overtravel of the upper drill rod section (31a), and the limiting stop (314) is located above the first discharge port (311).

5. The composite pile driver according to claim 2, characterized in that, The drill rod (31) has a built-in material conveying pipe (41); The conveying pipe (41) forms the conveying channel (40) and is connected to the first outlet (311), or the conveying pipe (41) and at least part of the inner cavity of the drill rod section (31a) connected to the cutting and stirring drill bit (32) are connected to form the conveying channel (40), and the drill rod section (31a) connected to the cutting and stirring drill bit (32) is connected to the first outlet (311); And / or, the conveying pipe (41) includes two or more pipe sections (41a) that are telescopically fitted together in sequence; or the conveying pipe (41) is at least partially a flexible pipe; or the conveying pipe (41) includes two or more pipe sections whose ends are connected in sequence.

6. The composite pile driver according to any one of claims 1-5, characterized in that, The conveying channel (40) is equipped with a spiral feeding mechanism (60), which includes a spiral conveying blade (61) built into the conveying channel (40) and a power unit (62) for driving the spiral conveying blade (61) to rotate. And / or, the first discharge port (311) and / or the liquid outlet (321) are equipped with a one-way valve (70), the one-way valve (70) having a one-way flow direction from the inside of the injection and stirring mechanism (30) to the outside of the injection and stirring mechanism (30).

7. The composite pile driver according to claim 6, characterized in that, The lateral braking assembly (83) includes two opposing connecting arms (831) respectively hinged to the lateral mounting base (82), a braking power source (832) for driving the connecting arms (831) to deflect, and a brake shoe (833) disposed at one end of the connecting arm (831) and adapted to the lateral guide rail (81), wherein each brake shoe (833) is connected to a connecting arm (831); And / or, the transverse mounting base (82) is provided with a transverse pulley (84) that slides in conjunction with the transverse guide rail (81).

8. The composite pile driver according to claim 1, characterized in that, The pile frame (10) has an auxiliary transverse rail (11) parallel to the transverse guide rail (81), and the bearing frame (21) has an auxiliary transverse wheel (211) that moves laterally back and forth along the auxiliary transverse rail (11). And / or, the pile driving guide clamping assembly (22) includes a guide assembly (221) and a clamping assembly (222) mounted on the support frame (21) and coaxially arranged. The guide assembly (221) is located above the clamping assembly (222). The guide assembly (221) includes a guide seat (2211) mounted on the support frame (21) and a guide wheel (2212) mounted on the guide seat (2211). The clamping assembly (222) includes a positioning clamping member (2221) mounted on the support frame (21), a movable clamping member (2222) mounted on the support frame (21), and a clamping drive member (2223) that drives the movable clamping member (2222) to move toward or away from the positioning clamping member (2221).

9. The composite pile driver according to claim 7 or 8, characterized in that, The cutting and stirring drill bit (32) also includes a chain frame (322) and at least one transmission chain (323) mounted on the chain frame (322) and capable of rotating circumferentially or reciprocating on the chain frame (322); The links of the transmission chain (323) are equipped with multiple cutting components (324) that protrude outward from the transmission chain (323), and the chain frame (322) is provided with a scraping component (325) near the cutting component (324) above the top of the transmission chain (323). And / or, the chain frame (322) is provided with a feeding pipe for conveying building particles and a second outlet (326) connected to the feeding pipe, the feeding pipe being connected to the conveying channel (40); And / or, the pile driving mechanism (20) further includes a lifting mechanism (90), the lifting mechanism (90) includes a lifting slide rail (91) installed on the transverse mounting base (82) and a lifting mounting base (92) that reciprocates vertically along the lifting slide rail (91), and the main pile clamp (1) is installed on the lifting mounting base (92); And / or, the material mixing mechanism (30) further includes a lifting mechanism (90), the lifting mechanism (90) includes a lifting slide rail (91) installed on the transverse mounting base (82) and a lifting mounting base (92) that reciprocates vertically along the lifting slide rail (91), and the drill rod (31) is installed on the lifting mounting base (92); And / or, the injection mixing mechanism (30) further includes a drill rod straightening assembly (33) mounted on the pile frame (10), the drill rod straightening assembly (33) having a through hole through which the drill rod (31) passes.

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