A multi-functional pile driver for a limited micro-space

Abstract

The present invention discloses a multi-functional pile driver for limited micro-space, belonging to the technical field of pile drivers. The multi-functional pile driver for limited micro-space of the present invention includes a main machine assembly, a drill rig assembly, a power head assembly, a multi-channel telescopic drill pipe and a process drill bit. The power head assembly includes a box body, a telescopic drive hydraulic motor, a drill pipe drive hydraulic motor, a multi-channel diverter, a drill pipe rotary joint and a screw drive joint installed on the box body. The present invention uses a dual-drive power head to control the rotation and telescoping of the multi-channel telescopic drill pipe, so that the overall height of the pile driver can be effectively reduced, pile foundation construction under low headroom can be realized, and multi-fluid channels are constructed in the multi-channel telescopic drill pipe, so that the telescopic drill pipe can cooperate with various process drill bits to complete various pile foundation construction processes on one pile driver, filling the blank of multi-functional pile drivers. In addition, the multi-channel diverter power head is designed in cooperation with the multi-channel telescopic drill pipe, which can reduce or eliminate the need for rod connection operations, reduce the construction complexity and improve the construction efficiency.

Description

Technical Field

[0001] The present invention relates to a pile driver for engineering pile construction, and more specifically, to a multi-functional pile driver in a limited micro-space. Background Art

[0002] The low headroom drill is a construction equipment designed specifically for limited spaces, and it can perform effective drilling operations in environments with limited height. With the acceleration of urbanization, the need for pile foundation construction in limited spaces often arises in infrastructure construction, such as under elevated bridges, inside buildings, or in dense urban environments. Traditional drills are difficult to use or even impossible to operate in these scenarios due to their large size and poor mobility.

[0003] Although some low headroom technologies meet the requirements of low headroom construction to a certain extent, there are still some problems and drawbacks. First, the structures of some low headroom drills are complex, resulting in increased difficulty in operation and maintenance. Second, the mobility and flexibility of some equipment still need to be improved to adapt to more variable construction environments. In addition, some equipment may have problems such as low drilling accuracy, low construction efficiency, or poor adaptability to different geological conditions in actual applications. Specifically, the following problems mainly exist:

[0004] (1) Drill pipe connection efficiency problem: In the prior art, for example, the "low headroom double-rotation drill and its construction method" disclosed in Chinese Patent No. ZL201711385608.0 (the authorization announcement date is April 9, 2024), its drill pipes usually need to be connected one by one, which not only increases the complexity of construction but also significantly reduces the construction efficiency.

[0005] (2) Lack of multi-functional pile driver: Currently, there is a lack of multi-functional pile drivers that can adapt to various foundation processes in the market. Many devices are often designed only for specific types of construction processes and lack flexibility and adaptability. For example, the "special split disassembly and assembly type pile construction machinery and method for ground reinforcement in a limited space" disclosed in Chinese Patent No. ZL202110400327.8 (the authorization announcement date is July 28, 2023), although it realizes multi-functionality to a certain extent, its construction in a limited space mainly relies on its disassembly and assembly structure design, and it needs to be assembled on-site to form a pile driver during actual operation and disassembled after construction, and the construction operation is relatively complex, and there are still limitations in actual use.

[0006] (3) Contradiction between narrow space and high torque requirements: When constructing in a narrow space, equipment with a smaller volume is usually required. However, during construction, high-torque equipment is often needed to ensure drilling efficiency. The dual requirements for equipment volume and performance form a contradiction. For example, the "front-back displacement type low-clearance drill rig" disclosed in Chinese Patent No. ZL201610702344.6 (authorization announcement date: October 25, 2019), its drilling part is installed on the gantry. The resistance generated by the drill bit during drilling will act on the gantry in the opposite direction. Due to structural reasons, the gantry can withstand limited torque. Therefore, it is difficult to improve the construction efficiency. Especially when encountering hard soil layers that require greater torque, a gantry with higher structural strength is needed to meet the construction requirements.

[0007] (4) Contradiction between the volume of the power head and the stroke space of the pile rig: In a limited space, the volume of the power head often occupies valuable construction space, restricting the stroke and construction range of the pile rig. For example, the "telescopic drill pipe and mixing pile rig with telescopic drill pipe" disclosed in Chinese Patent No. ZL201511021903.9 (authorization announcement date: June 29, 2018), its slewing mechanism occupies a large space, restricting its construction operation in a limited space.

[0008] (5) Problem of drill tool adaptability in construction techniques in narrow spaces: When performing various construction techniques in a narrow space, there is a lack of drill tools with strong adaptability. For example, the "application method of an ultra-low clearance down-the-hole rotary and torsion composite pile construction comprehensive device" disclosed in Chinese Patent No. ZL202410013409.0 (authorization announcement date: October 25, 2019), which mainly improves the power head part of the pile rig to form piles and holes in ways such as rotation, rotation with pressure, torsion, vibration, down-the-hole hammer, and top hammer. However, it mainly cooperates with the drilling bit to achieve pile formation and hole formation in various complex strata under ultra-low clearance, and is only suitable for specific construction environments and pile formation techniques, and it is difficult to meet diverse construction requirements. Summary of the Invention

[0009] 1. Technical problems to be solved by the invention

[0010] The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art and provide a multifunctional pile driver in a limited micro space. By adopting the technical solution of the present invention, the pile driver uses a dual-drive power head to rotate and telescope the multi-channel telescopic drill rod, so that the overall height of the pile driver can be effectively reduced, and low-headroom pile foundation construction can be achieved. In addition, multiple fluid channels are cleverly constructed in the multi-channel telescopic drill rod, so that the telescopic drill rod can be matched with a variety of process drill bits, and a variety of pile foundation construction processes can be completed on a pile driver, filling the gap of the multifunctional pile driver. In addition, the multi-channel shunt power head is matched with the multi-channel telescopic drill rod design to ensure the accuracy and stability of the drill rod telescopic motion control, which can reduce or eliminate the need for connecting rod operation, reduce construction complexity, and improve construction efficiency.

[0011] 2. Technical solution

[0012] In order to achieve the above object, the technical solution provided by the present invention is:

[0013] A multifunctional pile driver in a limited micro space of the present invention comprises a mainframe assembly, a drill frame assembly, a power head assembly, a multi-channel telescopic drill rod and a process drill bit, wherein the drill frame assembly is arranged on the mainframe assembly, the power head assembly is mounted on the drill frame assembly, the multi-channel telescopic drill rod is mounted on the power head assembly, and the process drill bit is mounted on the multi-channel telescopic drill rod; wherein,

[0014] The power head assembly includes a box body, and a telescopic drive hydraulic motor, a drill rod drive hydraulic motor, a multi-channel flow divider, a drill rod rotary joint and a screw drive joint installed on the box body. The box body is installed on the drilling frame assembly. The telescopic drive hydraulic motor is connected to the screw drive joint through a screw drive transmission mechanism. The drill rod drive hydraulic motor is connected to the drill rod rotary joint through a drill rod drive transmission mechanism. The multi-channel flow divider is arranged at the upper end of the screw drive joint.

[0015] The multi-channel telescopic drill pipe includes a first-stage fixed rod body, an intermediate telescopic rod body, a last-stage telescopic rod body, a first-stage screw rod, an intermediate drive screw rod, and a corrugated telescopic pipe. The first-stage fixed rod body, the intermediate telescopic rod body, and the last-stage telescopic rod body are sleeved together from the outside to the inside in sequence, and each stage of the telescopic rod body is axially non-rotatablely fitted relative to the first-stage fixed rod body; the first-stage screw rod and the intermediate drive screw rods are arranged inside the above-mentioned first-stage fixed rod body, intermediate telescopic rod body, and last-stage telescopic rod body, and the first-stage screw rod and each stage of intermediate drive screw rods are threadedly sleeved together from the inside to the outside in sequence; each stage of the intermediate drive screw rod is relatively rotatably connected to the corresponding stage of the intermediate telescopic rod body through an annular servo actuator, and the first-stage screw rod and each stage of intermediate drive screw rods are threadedly fitted with the corresponding next-stage intermediate telescopic rod body and the last-stage telescopic rod body; the upper end of the first-stage fixed rod body is connected to a drill pipe rotary joint for driving the multi-channel telescopic drill pipe to rotate; the upper end of the first-stage screw rod is connected to a screw rod drive joint for driving the multi-channel telescopic drill pipe to expand and contract; a plurality of fluid channels communicating with the corresponding shunt channels in the multi-channel shunt are provided on the first-stage screw rod; the upper end of the corrugated telescopic pipe is connected to the lower end of the first-stage screw rod through a multi-channel rotary joint, and tube channels corresponding to the above-mentioned fluid channels one by one are formed by sleeving from the inside to the outside, and each tube channel communicates with the corresponding channel opening at the lower end of the last-stage telescopic rod body;

[0016] The process drill bit is directly or through an extension section installed at the lower end of the last-stage telescopic rod body, and the corresponding pipe cavity in the process drill bit communicates with the corresponding channel opening on the last-stage telescopic rod body.

[0017] Furthermore, the main machine assembly includes a traveling mechanism, a working platform, a leg assembly, a hydraulic drive system, and a background control system. The working platform is installed on the traveling mechanism, the hydraulic drive system and the background control system are respectively integrated on the working platform, the drill rig assembly is installed on the front side of the working platform, the leg assembly is installed on the outside of the working platform, and an opening fixing device is provided on the leg assembly.

[0018] Furthermore, the leg assembly includes an oil cylinder bracket, a telescopic oil cylinder, and a support plate. The oil cylinder bracket is fixed on the working platform, the telescopic oil cylinder is vertically installed on the oil cylinder bracket, the support plate is fixed at the lower end of the telescopic oil cylinder, and the opening fixing device is installed on the support plate.

[0019] Furthermore, the opening fixing device includes a rotary oil cylinder and a rotary anchoring claw fixed at the lower end of the output shaft of the rotary oil cylinder. The output shaft of the rotary oil cylinder has a dust suction channel, and a dust suction pipe joint communicating with the dust suction channel is provided at the upper part of the cylinder body of the rotary oil cylinder.

[0020] Furthermore, the drill rig assembly is a mast drill lifting assembly or a foldable robotic arm assembly.

[0021] Furthermore, screw connection parts are provided at the upper ends of the intermediate drive screws at all levels, and intermediate rod connection parts are provided at the upper ends of the intermediate telescopic rod bodies at all levels. The screw connection parts are sleeved outside the corresponding intermediate rod connection parts, and the annular servomotor is arranged between the corresponding screw connection parts and intermediate rod connection parts to axially connect the screw connection parts and intermediate rod connection parts and enable relative rotation.

[0022] Furthermore, the primary fixed rod body, the intermediate telescopic rod body, and the final-stage telescopic rod body are all cylindrical structures, and anti-rotation guiding ribs are provided between the primary fixed rod body and the adjacent intermediate telescopic rod body, between the intermediate telescopic rod bodies at all levels, and between the final-stage telescopic rod body and the adjacent intermediate telescopic rod body.

[0023] Furthermore, the telescopic drive hydraulic motor and the drill pipe drive hydraulic motor are respectively horizontally installed on the side wall of the box body, and the telescopic drive hydraulic motor and the drill pipe drive hydraulic motor are respectively arranged on both sides of the box body.

[0024] Furthermore, the screw drive joint is a hollow rotating shaft, the upper end of the screw drive joint extends out of the box body, the multi-channel diverter includes a rotary diverter seat and a channel pipe, the channel pipe is sleeved inside the screw drive joint to form a concentric annular distribution of diversion channels, the rotary diverter seat is rotatably installed at the upper end of the screw drive joint, and pipe joints communicated with the corresponding diversion channels are provided on the rotary diverter seat.

[0025] Furthermore, the process drill bit includes one of a drilling bit, a mixing pile bit, a high-pressure jet grouting bit, and a threaded enlarged body steel pile bit, wherein,

[0026] The drilling bit has a drilling tip and a plurality of spiral wing plates located above the drilling tip. At least two fluid inlets and outlets axially spaced apart and communicated with the corresponding pipe cavities are further provided on the drilling bit. Removable plugs are provided on the fluid inlets and outlets, and different drilling circulation processes are formed by blocking different fluid inlets and outlets;

[0027] The mixing pile bit has a mixing tip and a plurality of mixing blades distributed on the side surface of the mixing pile bit. At least two fluid nozzles axially spaced apart and communicated with the corresponding pipe cavities are further provided on the mixing pile bit;

[0028] The high-pressure jet grouting bit has a jet grouting tip and at least one high-pressure nozzle communicated with the corresponding pipe cavity;

[0029] The upper end of the threaded enlarged body steel pile bit is provided with a steel pile joint, the steel pile joint is fixed at the lower end of the final-stage telescopic rod body, and a non-circular cross-section shaft hole plug-in fit is adopted between the steel pile joint and the threaded enlarged body steel pile bit.

[0030] 3. Beneficial effects

[0031] Adopting the technical solution provided by the present invention, compared with the existing well-known technologies, it has the following remarkable effects:

[0032] (1) A multi-functional pile driver in a limited micro-space of the present invention includes a main machine assembly, a drill rig assembly, a power head assembly, a multi-channel telescopic drill pipe, and a process drill bit. The power head assembly includes a box body, a telescopic drive hydraulic motor, a drill pipe drive hydraulic motor, a multi-channel diverter, a drill pipe rotary joint, and a screw drive joint installed on the box body. The multi-channel telescopic drill pipe includes a first-stage fixed rod body, an intermediate telescopic rod body, a final-stage telescopic rod body, a first-stage screw, an intermediate drive screw, and a corrugated telescopic pipe. The power head is a dual-drive power head, which can control the rotation and telescoping of the multi-channel telescopic drill pipe, effectively reducing the overall height of the pile driver, enabling pile foundation construction under low headroom, and cleverly constructing multiple fluid channels in the multi-channel telescopic drill pipe by using the telescopic structure design in cooperation with the corrugated telescopic pipe. This not only ensures the accuracy and stability of the telescopic movement control of the drill pipe, improves the verticality and precision of the construction drill pipe, but also enables the telescopic drill pipe to cooperate with various process drill bits, realizing the completion of multiple pile foundation construction processes on one pile driver, filling the gap of multi-functional pile drivers. In addition, through the design of the multi-channel diverter power head in cooperation with the multi-channel telescopic drill pipe, the operation of connecting rods can be reduced or eliminated, reducing the construction complexity and improving the construction efficiency.

[0033] (2) A multi-functional pile driver in a limited micro-space of the present invention, its main machine assembly includes a traveling mechanism, a working platform, a leg assembly, a hydraulic drive system, and a background control system. The hydraulic drive system and the background control system are respectively integrated on the working platform, with a compact structure and small occupied space, having the advantages of flexible movement, diverse applicable scenarios, and convenient construction in a limited space. And an opening fixator is provided on the leg assembly, which can firmly fix the main machine on the ground by using the opening fixator, effectively overcoming the torque generated by the large-torque power head, effectively improving the output torque of the pile driver, improving the construction efficiency, and solving the contradiction problem between the existing small-space pile driver and the large-torque requirement.

[0034] (3) A multifunctional pile driver in a limited micro space of the present invention, wherein the leg assembly comprises a cylinder bracket, a telescopic cylinder and a support plate, wherein the cylinder bracket is fixed on a working platform, the telescopic cylinder is vertically mounted on the cylinder bracket, the support plate is fixed on the lower end of the telescopic cylinder, and the hole-opening fixture is mounted on the support plate. The telescopic leg structure can be used to conveniently control the legs, and the support plate can increase the ground contact area and improve the support stability; further, the hole-opening fixture comprises a rotating cylinder and a rotating anchoring claw fixed at the lower end of the output shaft of the rotating cylinder, which can enable the rotating anchoring claw to quickly break through and anchor into the ground, thereby increasing the grip of the main machine; the output shaft of the rotating cylinder has a dust suction channel, and the upper part of the cylinder body of the rotating cylinder is provided with a dust suction pipe joint connected to the dust suction channel, which can suck out and collect dust while the anchoring claw breaks through the ground, thereby reducing the environmental pollution problem caused by dust at the construction site;

[0035] (4) A multifunctional pile driver in a limited micro space of the present invention has a drill frame assembly that is a mast drill lifting assembly or a foldable mechanical arm assembly. Drill frames of different structural forms can be selected according to the construction space. The mast drill lifting mechanism occupies a small area, is light and labor-saving to use, and is easy to maintain; the foldable mechanical arm can be extended into a narrow and long space for construction, meeting the construction needs of some special scenes;

[0036] (5) A multifunctional pile driver in a limited micro space of the present invention has a screw connecting portion at the upper end of each level of the intermediate transmission screw, and an intermediate rod connecting portion at the upper end of each level of the intermediate telescopic rod. The screw connecting portion is sleeved on the outer side of the corresponding intermediate rod connecting portion, and an annular relay is arranged between the corresponding screw connecting portion and the intermediate rod connecting portion to realize axial connection and relative rotation of the screw connecting portion and the intermediate rod connecting portion. The adoption of this structure not only facilitates the connection between the intermediate transmission screw and the corresponding intermediate rod, but also facilitates the threaded connection between the intermediate telescopic rod and the final telescopic rod and the upper screw, thereby cleverly realizing the synchronous telescopic movement of the telescopic rod.

[0037] (6) The multifunctional pile driver in a limited micro space of the present invention has a telescopic driving hydraulic motor and a drill rod driving hydraulic motor respectively installed flatly on the side walls of the box, and the telescopic driving hydraulic motor and the drill rod driving hydraulic motor are respectively placed on both sides of the box. The hydraulic motor adopts a flat installation structure, which reduces the size of the power head in the height direction, and can further reduce the overall height of the pile driver while ensuring the effective stroke space of the pile driver. With the multi-channel telescopic drill rod, efficient and accurate construction operations can be achieved in a limited space. Dual hydraulic motors are used for propulsion, and the mechanical structure is simple and maintenance is convenient.

[0038] (7) A multi-functional pile driver in a limited micro-space according to the present invention, the process drill bit thereof includes one of a drilling bit, a mixing pile bit, a high-pressure jet grouting bit and a threaded enlarged steel pile bit. Construction of bored cast-in-place piles, mixing piles, high-pressure jet grouting piles and threaded enlarged steel piles can be achieved on one pile driver, greatly improving the applicability and multi-functionality of the pile driver, and diverse construction requirements can be realized. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 is a schematic three-dimensional structure diagram of a multi-functional pile driver in a limited micro-space according to the present invention;

[0040] Figure 2 is a schematic three-dimensional structure diagram of the power head assembly of the present invention from one angle;

[0041] Figure 3 is a schematic three-dimensional structure diagram of the power head assembly of the present invention from another angle;

[0042] Figure 4 is a schematic cross-sectional structure diagram of the power head assembly of the present invention;

[0043] Figure 5 is a schematic three-dimensional structure diagram of the multi-channel telescopic drill pipe in the extended state of the present invention;

[0044] Figure 6 is a schematic cross-sectional structure diagram of the multi-channel telescopic drill pipe in the extended state of the present invention;

[0045] Figure 7 is a schematic three-dimensional structure diagram of the multi-channel telescopic drill pipe in the contracted state of the present invention;

[0046] Figure 8 is a schematic cross-sectional structure diagram of the multi-channel telescopic drill pipe in the contracted state of the present invention;

[0047] Figure 9(a) is a schematic three-dimensional structure diagram of the multi-channel telescopic drill pipe used in cooperation with the drilling bit of the present invention;

[0048] Figure 9(b) is a schematic cross-sectional structure diagram of the multi-channel telescopic drill pipe used in cooperation with the drilling bit of the present invention;

[0049] Figure 10 is a reference diagram of the construction state of a multi-functional pile driver in a limited micro-space according to the present invention in cooperation with the drilling bit;

[0050] Figure 11(a) is a schematic three-dimensional structure diagram of the multi-channel telescopic drill pipe used in cooperation with the mixing pile bit of the present invention;

[0051] Figure 11(b) is a schematic cross-sectional structure diagram of the multi-channel telescopic drill pipe used in cooperation with the mixing pile bit of the present invention;

[0052] Figure 12 It is a reference diagram of the construction state of a multi-functional pile driver in a limited micro-space of the present invention in cooperation with a mixing pile drill bit;

[0053] Figure 13(a) is a schematic three-dimensional structure diagram of a multi-channel telescopic drill pipe in the present invention in cooperation with a high-pressure jet grouting drill bit;

[0054] Figure 13(b) is a schematic cross-sectional structure diagram of a multi-channel telescopic drill pipe in the present invention in cooperation with a high-pressure jet grouting drill bit;

[0055] Figure 14 It is a reference diagram of the construction state of a multi-functional pile driver in a limited micro-space of the present invention in cooperation with a high-pressure jet grouting drill bit;

[0056] Figure 15(a) is a schematic combined state diagram of a multi-channel telescopic drill pipe in the present invention in cooperation with a threaded enlarged body steel pile drill bit;

[0057] Figure 15(b) is a schematic disassembled state diagram of a multi-channel telescopic drill pipe in the present invention in cooperation with a threaded enlarged body steel pile drill bit

[0058] Figure 16 It is a reference diagram of the construction state of a multi-functional pile driver in a limited micro-space of the present invention in cooperation with a threaded enlarged body steel pile drill bit;

[0059] Figure 17 It is a schematic three-dimensional structure diagram of a leg assembly in a multi-functional pile driver in a limited micro-space of the present invention;

[0060] Figure 18 It is a schematic three-dimensional structure diagram of an opening fixator in a multi-functional pile driver in a limited micro-space of the present invention;

[0061] Figure 19 It is a schematic cross-sectional structure diagram of an opening fixator in a multi-functional pile driver in a limited micro-space of the present invention;

[0062] Figure 20 It is a schematic structure diagram of a multi-functional pile driver in a limited micro-space of the present invention adopting a foldable robotic arm.

[0063] Explanation of the reference numerals in the schematic diagram:

[0064] 100, Main machine assembly; 11, Traveling mechanism; 12, Working platform; 13, Outrigger assembly; 131, Cylinder bracket; 132, Telescopic cylinder; 133, Support plate; 134, Opening fixator; 1341, Rotary cylinder; 1342, Rotary anchoring claw; 1343, Dust suction channel; 1344, Dust suction pipe joint; 14, Hydraulic drive system; 15, Background control system; 200, Mast drill lifting assembly; 200', Foldable robotic arm assembly; 300, Power head assembly; 31, Box body; 32, Telescopic drive hydraulic motor; 33, Drill pipe drive hydraulic motor; 34, Multi-channel diverter; 34-1, Rotary diverter seat; 34-2, Channel pipe; 34-3, Diverting channel; 35, Drill pipe rotary joint; 36, Screw drive joint; 37, Drill pipe drive transmission mechanism; 38, Screw drive transmission mechanism; 400, Multi-channel telescopic drill pipe; 41, First-stage fixed rod body; 42, Intermediate telescopic rod body; 42-1, Intermediate rod body connection part; 43, Final-stage telescopic rod body; 43-1, Channel opening; 44, Anti-rotation guide rib; 45, First-stage screw; 45-1, Fluid channel; 46, Intermediate drive screw; 46-1, Screw connection part; 47, Annular servomotor; 48, Corrugated expansion pipe; 48-1, Multi-channel rotary joint; 500, Process drill bit; 510, Boring drill bit; 511, Boring drill tip; 512, Spiral wing plate; 513, Fluid inlet and outlet; 514, Plug; 520, Mixing pile drill bit; 521, Mixing drill tip; 522, Mixing blade; 523, Fluid nozzle; 530, High-pressure rotary jet drill bit; 531, Rotary jet drill tip; 532, High-pressure nozzle; 540, Thread-expanded steel pile drill bit; 541, Steel pile joint. Detailed implementation mode

[0065] To further understand the content of the present invention, the present invention will be described in detail with reference to the accompanying drawings and embodiments.

[0066] [Embodiment]

[0067] Combined with Figure 1 As shown in the figure, a multi-functional pile driver in a limited micro-space of this embodiment includes a main machine assembly 100, a drill rig assembly, a power head assembly 300, a multi-channel telescopic drill pipe 400, and a process drill bit 500. The main machine assembly 100 serves as the basic platform of the pile driver and plays a supporting role; the drill rig assembly is arranged on the main machine assembly 100 and can construct piles at a certain angle, mainly used for the drilling or lifting of the drill tool; the power head assembly 300 is installed on the drill rig assembly and is used to drive the drill tool to rotate; the multi-channel telescopic drill pipe 400 is installed on the power head assembly 300 and can perform telescopic movement to cooperate with drilling or lifting, reducing or avoiding the operation of connecting rods; the process drill bit 500 is installed on the multi-channel telescopic drill pipe 400 and is used to realize the construction of different pile driver processes. Among them,

[0068] Referring to Figures 2 to 4As shown, the above-mentioned power head assembly 300 includes a box body 31, a telescopic drive hydraulic motor 32, a drill pipe drive hydraulic motor 33, a multi-channel diverter 34, a drill pipe rotary joint 35, and a screw drive joint 36 installed on the box body 31. The box body 31 is installed on the drill rig assembly. The telescopic drive hydraulic motor 32, the drill pipe drive hydraulic motor 33, the multi-channel diverter 34, the drill pipe rotary joint 35, and the screw drive joint 36 are all arranged on the box body 31. The telescopic drive hydraulic motor 32 is drivingly connected to the screw drive joint 36 through a screw drive transmission mechanism 38 and can drive the screw drive joint 36 to rotate independently, so as to control the telescopic movement of the multi-channel telescopic drill pipe 400. The drill pipe drive hydraulic motor 33 is drivingly connected to the drill pipe rotary joint 35 through a drill pipe drive transmission mechanism 37 and can drive the drill pipe rotary joint 35 to rotate independently, so as to control the overall rotation of the multi-channel telescopic drill pipe 400. The multi-channel diverter 34 is arranged at the upper end of the screw drive joint 36 and is used to connect the ground fluid pipeline to input or discharge the fluid medium into or through the process drill bit 500 according to different pile foundation construction processes. The drill pipe rotary joint 35 is located outside the screw drive joint 36, and it is preferably coaxially arranged with the screw drive joint 36.

[0069] Referring to Figures 5 to 8As shown in the figure, the above-mentioned multi-channel telescopic drill pipe 400 includes a first-stage fixed rod body 41, an intermediate telescopic rod body 42, a last-stage telescopic rod body 43, a first-stage screw rod 45, an intermediate transmission screw rod 46, and a corrugated telescopic pipe 48. The first-stage fixed rod body 41, the intermediate telescopic rod body 42, and the last-stage telescopic rod body 43 are sleeved together from the outside to the inside in sequence, and each stage of telescopic rod body is axially non-rotatablely fitted relative to the first-stage fixed rod body 41, that is, each stage of intermediate telescopic rod body 42 and the last-stage telescopic rod body 43 can only axially telescopically move relative to each other and cannot rotate relative to each other. From the first-stage fixed rod body 41 to the last-stage telescopic rod body 43, the diameters of the rod bodies gradually decrease. The first-stage screw rod 45 and the intermediate transmission screw rods 46 are arranged inside the above-mentioned first-stage fixed rod body 41, intermediate telescopic rod body 42, and last-stage telescopic rod body 43, and the first-stage screw rod 45 and each stage of intermediate transmission screw rods 46 are threadedly sleeved together from the inside to the outside in sequence, that is, the diameters of the first-stage screw rod 45 and each stage of intermediate transmission screw rods 46 gradually increase. Each stage of intermediate transmission screw rod 46 is relatively rotatably connected to the corresponding stage of intermediate telescopic rod body 42 through an annular servo actuator 47, so that the intermediate transmission screw rod 46 and the corresponding stage of intermediate telescopic rod body 42 can rotate relative to each other and cannot axially move; the first-stage screw rod 45 and each stage of intermediate transmission screw rods 46 are threadedly engaged with the corresponding next-stage intermediate telescopic rod body 42 and the last-stage telescopic rod body 43, and by driving the first-stage screw rod 45 to rotate, each stage of telescopic rod body is driven to axially telescopically move synchronously relative to the first-stage fixed rod body 41. Relative rotational movement is possible between the first-stage screw rod 45 and the first-stage fixed rod body 41, and axial movement is also restricted. The upper end of the first-stage fixed rod body 41 is connected to the drill pipe rotary joint 35 for driving the multi-channel telescopic drill pipe 400 to rotate; the upper end of the first-stage screw rod 45 is connected to the screw rod drive joint 36 for driving the multi-channel telescopic drill pipe 400 to telescopically move. When the screw rod drive joint 36 drives the first-stage screw rod 45 to rotate, the intermediate telescopic rod body 42 of the second stage axially moves on the first-stage screw rod 45, driving the intermediate transmission screw rod 46 of the same stage to axially move together. Since the intermediate transmission screw rod 46 of the second stage is threadedly engaged with the first-stage screw rod 45, the intermediate transmission screw rod 46 of the second stage also rotates together at this time; the intermediate transmission screw rod 46 of the second stage rotates to drive the intermediate telescopic rod body 42 of the next stage to axially move, and at the same time drives the intermediate transmission screw rod 46 of the next stage to axially move and rotate, and the transmission is carried out step by step until the last-stage telescopic rod body 43 is driven to axially move. In this way, each stage of intermediate telescopic rod body 42 and the last-stage telescopic rod body 43 can axially telescopically move synchronously relative to the first-stage fixed rod body 41, ensuring the accuracy and stability of the control of the telescopic movement of the telescopic drill pipe, and improving the verticality and precision of the construction drill pipe. The number of intermediate telescopic rod bodies 42 and intermediate transmission screw rods 46 is equal, and the specific number can be determined according to the telescopic stroke requirements. As Figure 7 and Figure 8 shown, the length of the multi-channel telescopic drill pipe 400 after contraction is equivalent to the length of the first-stage fixed rod body 41, as Figure 5 and Figure 6As shown, the maximum extended length can reach several times the length of the first-stage fixed rod body 41. For the convenience of illustration, Figures 5 to 8 The specific implementation scheme of setting two intermediate telescopic rod bodies 42 is given in Figures 5 to 8 . The two intermediate telescopic rod bodies 42 are respectively the second-stage intermediate telescopic rod body and the third-stage intermediate telescopic rod body. Correspondingly, the two intermediate drive screw rods 46 are respectively the second-stage drive screw rod and the third-stage drive screw rod. When it is necessary to increase the telescopic length of the telescopic drill rod, it can be achieved by increasing the number of sections of the intermediate telescopic rod body 42 and the intermediate drive screw rod 46. A number of fluid channels 45-1 communicating with the corresponding shunt channels 34-3 in the multi-channel shunt 34 are provided on the first-stage screw rod 45; specifically, at least two fluid channels 45-1 are provided on the first-stage screw rod 45 from the inside to the outside, and each fluid channel 45-1 is annularly distributed outward from the center. The upper end of the corrugated telescopic pipe 48 is connected to the lower end of the first-stage screw rod 45 through a multi-channel rotary joint 48-1, so that the first-stage screw rod 45 can rotate freely relative to the corrugated telescopic pipe 48 and maintain the connection tightness of each channel. The corrugated telescopic pipe 48 is formed by annularly sleeving from the inside to the outside to form pipe channels corresponding to the above fluid channels 45-1 one by one, and each pipe channel is communicated with the corresponding channel port 43-1 at the lower end of the last-stage telescopic rod body 43. That is to say, the central lumen of the innermost corrugated telescopic pipe 48 is a fluid channel, and the annular interlayer between adjacent corrugated telescopic pipes 48 is a fluid channel. The number of fluid channels can be determined according to the number of annular sleeves of the corrugated telescopic pipe 48. The above corrugated telescopic pipe 48 can be made of high-strength materials to withstand the pressure of high-pressure fluids. The multi-channel rotary joint 48-1 is similar to the existing rotary joint, realizing the relative rotation of the connected pipelines and can be used for the transportation of fluids such as gas and liquid. The multi-fluid channels are constructed in the telescopic drill rod by using the corrugated telescopic pipes 48 sleeved together, which is not only simple and compact in structure, convenient for manufacturing and implementation, but also the establishment of multi-fluid channels in the telescopic drill rod makes it possible to cooperate with a variety of process drill bits 500, greatly improving the applicability of the telescopic drill rod.

[0070] The process drill bit 500 is directly or installed at the lower end of the last-stage telescopic rod body 43 through an extension section, and the corresponding pipe cavity in the process drill bit 500 is communicated with the corresponding channel port 43-1 on the last-stage telescopic rod body 43. The multi-functional telescopic drill formed by the above telescopic drill rod cooperating with a variety of process drill bits 500 can reduce the frequent rod connection operation by using the multi-stage telescopic function of the telescopic drill rod, improve the degree of construction automation, reduce the complexity of construction operations, and improve construction efficiency. The multi-channel design of the telescopic drill rod can enable the drill to establish different fluid channels, which can be used for construction of bored cast-in-place piles, mixing piles, high-pressure jet grouting piles, and screw-expanded steel piles, etc., solving the adaptability problem of traditional pile drivers.

[0071] As can be seen from the above, a multi-functional pile driver in a limited micro-space according to this embodiment has a double-drive power head, which can control the rotation and telescoping of a multi-channel telescopic drill pipe, effectively reducing the overall height of the pile driver, enabling pile foundation construction under low headroom, and cleverly constructing multi-fluid channels in the multi-channel telescopic drill pipe by using the telescopic structure design in cooperation with the corrugated telescopic pipe. This not only ensures the accuracy and stability of the telescopic movement control of the drill pipe, improves the verticality and precision of the construction drill pipe, but also enables the telescopic drill pipe to cooperate with various process drill bits, realizing the completion of various pile foundation construction processes on one pile driver, filling the gap in multi-functional pile drivers. In addition, through the design of the multi-channel shunt power head in cooperation with the multi-channel telescopic drill pipe, the rod connection operation can be reduced or eliminated, reducing the construction complexity and improving the construction efficiency.

[0072] As shown Figure 1 As shown, a multi-functional pile driver in a limited micro-space according to this embodiment has a main machine assembly 100 including a traveling mechanism 11, a working platform 12, a leg assembly 13, a hydraulic drive system 14, and a background control system 15. The working platform 12 is installed on the traveling mechanism 11 and can be driven by the traveling mechanism 11 to move the entire pile driver. The traveling mechanism 11 preferably adopts a crawler-type traveling structure and can move in complex environments. The working platform 12 preferably adopts a rotating platform, which can rotate horizontally relative to the traveling mechanism 11 to facilitate adjusting the construction direction and improving the construction flexibility of the pile driver. The hydraulic drive system 14 and the background control system 15 are respectively integrated on the working platform 12. The hydraulic drive system 14 mainly consists of a hydraulic oil tank, a hydraulic pump station, a hydraulic vacuum pump, a hydraulic control console, and corresponding valve groups and pipelines, etc. The background control system 15 mainly consists of an electrical control cabinet, etc. Integrating the hydraulic drive system 14 and the background control system 15 on the working platform respectively has the advantages of compact structure, small occupied space, flexible movement, diverse applicable scenarios, and convenient construction in a limited space. In addition, the drill rig assembly is installed on the front side of the working platform 12, and the leg assembly 13 is installed on the outer side of the working platform 12. An opening fixator 134 is provided on the leg assembly 13. Preferably, two groups of leg assemblies 13 are provided on the left and right sides of the working platform 12 respectively. By using the opening fixator 134 on the leg assembly 13, the main machine can be firmly fixed on the ground, effectively overcoming the torque generated by the large-torque power head, effectively improving the output torque of the pile driver, improving the construction efficiency, and solving the contradiction between existing small-space pile drivers and large-torque requirements.

[0073] Specifically, referring to Figures 17 to 19As shown, the outrigger assembly 13 includes an oil cylinder support 131, a telescopic oil cylinder 132, and a support plate 133. The oil cylinder support 131 is fixed on the working platform 12. The telescopic oil cylinder 132 is vertically installed on the oil cylinder support 131. The support plate 133 is fixed at the lower end of the telescopic oil cylinder 132. The hole-opening fixator 134 is installed on the support plate 133. With the telescopic outrigger structure, it is convenient to control the outriggers. The support plate 133 can increase the contact area with the ground and improve the support stability. Multiple hole-opening fixators 134 can be provided on the support plate 133, such as Figure 17 four groups of hole-opening fixators 134 are provided in Figure 17 . Further, the hole-opening fixator 134 includes a rotary oil cylinder 1341 and a rotary anchoring claw 1342 fixed to the lower end of the output shaft of the rotary oil cylinder 1341. The rotary anchoring claw 1342 is provided with alloy cutting tools. The rotary oil cylinder 1341 drives the rotary anchoring claw 1342 to rotate to break the ground. As the telescopic oil cylinder 13 presses down, the rotary anchoring claw 1342 can be anchored into the ground, enabling the rotary anchoring claw to quickly break and anchor into the formation, increasing the grip of the main machine; in addition, the output shaft of the rotary oil cylinder 1341 has a dust suction channel 1343. A dust suction pipe joint 1344 communicating with the dust suction channel 1343 is provided on the upper part of the cylinder body of the rotary oil cylinder 1341. The upper part of the cylinder body of the rotary oil cylinder 1341 is sleeved on the output shaft. The dust suction pipe joint 1344 is provided on the upper part of the cylinder body and has a certain distance from the upper end of the output shaft of the rotary oil cylinder 1341, enabling the output shaft to rotate freely and keeping the dust suction channel 1343 unobstructed. With the above design, dust can be sucked out and collected while the anchoring claw breaks the formation, reducing the environmental pollution problem caused by dust at the construction site. The rotary anchoring claw 1342 can adopt a four-lobe structure. During operation, the four-lobe rotary anchoring claw 1342 with alloy is driven by the rotary oil cylinder 1341 (or hydraulic motor) to rotate at a high speed to cut the ground. While cutting the ground, the debris formed by the rotary anchoring claw 1342 is sucked away by the vacuum pump through the dust suction channel 1343 to avoid environmental pollution. In addition, an expansion oil cylinder for driving the rotary anchoring claw 1342 to expand can be provided on the above hole-opening fixator 134. After the drilling is formed, the expansion oil cylinder is pushed downward to press the four-lobe rotary anchoring claw 1342 to expand and tighten, thereby firmly fixing the main machine on the ground.

[0074] In this embodiment, the drill rig assembly can be the mast drill lifting assembly 200 or the foldable robotic arm assembly 200'. Different structural forms of drill rigs can be selected according to the construction space. Figure 1Shown is the structural form of the mast drill lifting assembly 200, which has the advantages of small floor area, being light and labor-saving in use, and being easy to maintain. It mainly consists of a main mast, a main mast clamp, a clamp oil cylinder, a hydraulic winch, etc. The main mast clamp is installed on the working platform 12 through a boom and an oil cylinder, and the pile forming angle can be controlled by the boom and the oil cylinder. The main mast is installed on the main mast clamp, and the main mast is clamped and fixed by the clamp oil cylinder. The hydraulic winch is installed on the main mast and is connected to the power head assembly 300. The box body 31 of the power head assembly 300 slides on the main mast and can move up and down under the control of the hydraulic winch on the main mast. Figure 20 Shown is the structural form of the foldable robotic arm assembly 200', which can extend into a narrow space for construction, meeting the construction needs of some special scenarios. It mainly consists of 2 to 3 folding arms, and the rotation angle is controlled by a hydraulic cylinder. Structurally, it is similar to the digging arm of an existing excavator. When the foldable robotic arm assembly 200' is adopted, the box body 31 of the power head assembly 300 is hinged at the free end of the foldable robotic arm assembly 200', and the relative angle between the two can be controlled by a hydraulic cylinder. The above-mentioned mast drill lifting assembly 200 and foldable robotic arm assembly 200' are similar to the prior art, and their specific structures and operating principles will not be elaborated here.

[0075] Referring to Figure 6 As shown, in this embodiment, for the multi-channel telescopic drill pipe 400, screw connection parts 46-1 are provided at the upper ends of the intermediate drive screws 46 of each stage, and intermediate rod body connection parts 42-1 are provided at the upper ends of the intermediate telescopic rod bodies 42 of each stage. The screw connection part 46-1 is sleeved outside the corresponding intermediate rod body connection part 42-1, and an annular servo cylinder 47 is arranged between the corresponding screw connection part 46-1 and intermediate rod body connection part 42-1 to axially connect the screw connection part 46-1 and the intermediate rod body connection part 42-1 and enable relative rotation. The diameter of the screw connection part 46-1 is slightly larger than the diameter of the intermediate drive screw 46. The cross-section of the intermediate rod body connection part 42-1 is in an inverted "U" shape, and the inner free end of the intermediate rod body connection part 42-1 is sleeved inside the screw connection part 46-1. While realizing the connection between the screw connection part 46-1 and the intermediate rod body connection part 42-1, the inner free end of the intermediate rod body connection part 42-1 can also be used to realize the threaded connection with the corresponding screw, cleverly realizing the synchronous telescopic movement of the telescopic rod body. The above-mentioned annular servo cylinder 47 is a circular ring structural member, such as a steel ring, etc. Corresponding annular grooves are respectively arranged between the screw connection part 46-1 and the intermediate rod body connection part 42-1, and the annular servo cylinder 47 is located in the annular groove, enabling the intermediate telescopic rod body 42 and the intermediate drive screw 46 of the corresponding stage to be axially connected together to transmit axial force, while also ensuring the free rotation of the two. Of course, the annular servo cylinder 47 can also be several annularly distributed steel balls, etc.

[0076] AsFigure 5 and Figure 7 As shown, in this embodiment, the above-mentioned first-stage fixed rod body 41, intermediate telescopic rod body 42, and final-stage telescopic rod body 43 are all cylindrical structures, and anti-rotation guide ribs 44 are provided between the first-stage fixed rod body 41 and the adjacent intermediate telescopic rod body 42, between each intermediate telescopic rod body 42, and between the final-stage telescopic rod body 43 and the adjacent intermediate telescopic rod body 42. The cylindrical rod body is easy to manufacture, and after the steel reinforcement cage is lowered, the multi-channel telescopic drill pipe can be inserted inside the steel reinforcement cage and used as a grouting conduit. The anti-rotation guide ribs 44 are slidably matched with the corresponding guide grooves, enabling smooth telescopic movement between the rod bodies at all levels and preventing relative rotation. As Figure 6 and Figure 8 shown, in this embodiment, the first-stage screw rod 45 is a hollow screw rod, and the fluid channel 45-1 is composed of concentric tubes sleeved layer by layer inside the first-stage screw rod 45. The concentric tubes are spaced apart and connected together by spacer blocks between the inner wall of the first-stage screw rod 45 and between adjacent concentric tubes, ensuring the smoothness of the formed annular fluid channel 45-1, and the formed fluid channel 45-1 is convenient to correspond one-to-one with the pipe channel formed by the multi-channel rotary joint 48-1 and the corrugated telescopic pipe 48.

[0077] Referring to Figure 2 and Figure 3 shown, in this embodiment, for the power head assembly 300, the telescopic drive hydraulic motor 32 and the drill pipe drive hydraulic motor 33 are respectively horizontally installed on the side wall of the box body 31, and the telescopic drive hydraulic motor 32 and the drill pipe drive hydraulic motor 33 are respectively located on both sides of the box body 31. The hydraulic motor adopts a horizontal installation structure, reducing the size of the power head in the height direction, and can further reduce the overall height of the pile driver while ensuring the effective stroke space of the pile driver. Cooperating with the multi-channel telescopic drill pipe can achieve efficient and precise construction operations in a limited space. Using two hydraulic motors for propulsion, the mechanical structure is simple and convenient for maintenance. The above-mentioned drill pipe drive transmission mechanism 37 and the screw rod drive transmission mechanism 38 both adopt planetary gear reduction mechanisms, which are compact in structure, high in transmission efficiency, and can withstand large loads. The planetary gear reduction mechanism is an existing reduction mechanism, so the specific structural principle thereof will not be elaborated again. As Figure 4As shown, the screw drive joint 36 is a hollow rotating shaft. The upper end of the screw drive joint 36 extends out of the box body 31. The multi-channel diverter 34 includes a rotary diverter base 34-1 and a channel pipe 34-2. The channel pipe 34-2 is sleeved inside the screw drive joint 36 to form a diversion channel 34-3 distributed in a concentric ring shape. The rotary diverter base 34-1 is rotatably installed at the upper end of the screw drive joint 36, and a pipe joint communicating with the corresponding diversion channel 34-3 is provided on the rotary diverter base 34-1. An annular distribution cavity with rotary sealing is also provided at the corresponding pipe joint. Each pipe joint can communicate with the corresponding diversion channel 34-3 through the corresponding annular distribution cavity, so that during the rotation of the screw drive joint 36, the rotary diverter base 34-1 and the pipe joints thereon can remain relatively stationary, realizing fluid diversion and preventing the fluid pipeline from winding.

[0078] Referring to Figure 1 As shown, in this embodiment, the process drill bit 500 includes one of a drilling bit 510, a mixing pile drill bit 520, a high-pressure jet grouting drill bit 530, and a threaded enlarged body steel pile drill bit 540. Construction of bored cast-in-place piles, mixing piles, high-pressure jet grouting piles, and threaded enlarged body steel piles can be realized on one pile driver, greatly improving the applicability and versatility of the pile driver and meeting diverse construction requirements.

[0079] Figure 9(a), Figure 9(b) and Figure 10A multi-functional pile driver used in conjunction with a drilling bit 510 is shown. The drilling bit 510 has a drilling tip 511 and a plurality of spiral vanes 512 located above the drilling tip 511. A plurality of alloy cutters are provided on the spiral vanes 512. At least two fluid inlets and outlets 513 which are axially spaced apart and communicate with corresponding cavities are also provided on the drilling bit 510. Removable plugs 514 are provided in a matching manner on the fluid inlets and outlets 513. Different drilling circulation processes are formed by blocking different fluid inlets and outlets 513. During drilling construction, the drilling bit 510 is mainly driven by a power head assembly 300 and a multi-channel telescopic drill pipe 400 to rotate and cut the soil for drilling. There are two normal drilling mud circulation methods, namely positive circulation and reverse circulation. In positive circulation, the mud is ejected from the bottom of the drill pipe, driving the drill cuttings to be transported upward along the outside of the drill pipe to the ground for sedimentation, realizing the formation of a drilled hole. The positive circulation drill bit is easily wrapped by the soil and prone to mud sticking. In reverse circulation, the mud flows into the hole from the outside mud pool, and at the bottom of the drill hole, the mud and drill cuttings are sucked to the ground through the middle channel of the drill pipe by a vacuum pump to complete the formation of the drilled hole. Since the reverse circulation process does not require repeated crushing of the drill cuttings and directly sucks the drill cuttings, its hole formation efficiency is higher than that of positive circulation. Its disadvantage is that the mud enters from the outside hole, easily scours the hole wall, and easily causes the hole wall to be unstable and collapse. Since the drilling bit 510 in this embodiment is designed with a dual-channel, a new mud circulation process can be adopted, which we call "reverse reverse circulation". The mud circulation is input from the first channel of the drill pipe to the bottom of the drill bit. The drill bit cuts the soil, and the formed mixture of mud and drill cuttings is directly sucked to the ground through the upper fluid inlet and outlet 513 of the drill bit and the second channel of the drill pipe by a vacuum pump. The hole formation speed is fast, and at the same time, it avoids the mud scouring the hole wall, which easily causes the hole wall to be unstable and collapse. In addition, when the "reverse reverse circulation" process is not adopted, the fluid inlet and outlet 513 at the lower spiral vane 512 can be opened. While drilling in reverse circulation, high-pressure gas is ejected from the lower part of the drill bit to assist in cutting the soil, and at the same time, it avoids the soil wrapping the drill bit and mud sticking. In addition, during the construction of bored cast-in-place piles, after the hole is formed and the steel reinforcement cage is normally lowered, the drilling bit 510 can be disassembled, and the multi-channel telescopic drill pipe 400 can be reinserted into the hole and used as a conduit, avoiding the installation and disassembly work of the grouting conduit in a narrow space and improving the construction efficiency.

[0080] Figures 11(a), 11(b) and Figure 12The figure shows a multi-functional pile driver used in conjunction with a mixing pile drill bit 520. The mixing pile drill bit 520 has a mixing drill tip 521 and a plurality of mixing blades 522 distributed on the side of the mixing pile drill bit 520. At least two fluid nozzles 523 are axially spaced apart on the mixing pile drill bit 520 and are connected to corresponding cavities. During mixing pile construction, the mixing pile drill bit 520 is mainly driven by the power head assembly 300 and the multi-channel telescopic drill pipe 400 to rotate and mix the soil. At the same time, through the multiple channels in the multi-channel telescopic drill pipe 400 and the mixing pile drill bit 520, a curing agent and gas are conveyed through the fluid nozzles 523 and mixed with the soil to form a mixing pile body.

[0081] Figure 13(a), Figure 13(b) and Figure 14 The figure shows a multi-functional pile driver used in conjunction with a high-pressure jet grouting drill bit 530. The high-pressure jet grouting drill bit 530 has a jet grouting drill tip 531 and at least one high-pressure nozzle 532 connected to a corresponding cavity. During high-pressure jet grouting pile construction, the high-pressure jet grouting drill bit 530 is mainly driven by the power head assembly 300 and the multi-channel telescopic drill pipe 400 to rotate, and the soil is cut by the high-pressure curing agent fluid and gas. Through the multiple channels in the multi-channel telescopic drill pipe 400 and the high-pressure jet grouting drill bit 530, a curing agent and gas are conveyed through the high-pressure nozzle 532 and mixed with the soil to form a high-pressure jet grouting pile body.

[0082] Figure 15(a), Figure 15(b) and Figure 16 The figure shows a multi-functional pile driver used in conjunction with a threaded enlarged steel pile drill bit 540. The upper end of the threaded enlarged steel pile drill bit 540 is provided with a steel pile joint 541. The steel pile joint 541 is fixed to the lower end of the last-stage telescopic rod body 43. A non-circular cross-section shaft-hole plug-in fit is adopted between the steel pile joint 541 and the threaded enlarged steel pile drill bit 540. For example, a non-circular cross-section shaft-hole plug-in fit such as a regular hexagon can be adopted between the steel pile joint 541 and the threaded enlarged steel pile drill bit 540 to achieve torque transmission and facilitate separation after the threaded enlarged steel pile drill bit 540 is implanted. During threaded enlarged steel pile construction, the threaded enlarged steel pile drill bit 540 is mainly driven by the power head assembly 300 and the multi-channel telescopic drill pipe 400 to rotate and implant into the soil. Then, the multi-channel telescopic drill pipe 400 is lifted and separated from the first-stage threaded enlarged steel pile drill bit 540, and the second-stage threaded enlarged steel pile drill bit 540 is connected and the construction continues until the set elevation is reached, forming a threaded enlarged steel pile. A non-circular cross-section shaft-hole plug-in fit is also adopted between two adjacent threaded enlarged steel pile drill bits 540.

[0083] The multifunctional pile driver in a limited micro space of the present invention utilizes a dual-drive power head to control the rotation and extension of a multi-channel telescopic drill rod, so that the overall height of the pile driver can be effectively reduced, and pile foundation construction under low clearance can be realized. In addition, multiple fluid channels are cleverly constructed in the multi-channel telescopic drill rod, so that the telescopic drill rod can be matched with a variety of process drill bits, and a variety of pile foundation construction processes can be completed on one pile driver, filling the gap of multifunctional pile drivers. In addition, the multi-channel shunt power head is matched with the multi-channel telescopic drill rod design to ensure the accuracy and stability of the drill rod telescopic motion control, which can reduce or eliminate the need for connecting rod operation, reduce construction complexity, and improve construction efficiency. In addition, the present invention also has the following specific features:

[0084] (1) Regarding the contradiction between the construction of pile drivers in a narrow space and the demand for high torque:

[0085] The main machine can be firmly fixed on the ground by using the hole fixing device. The torque generated by the high-torque power head can be effectively overcome. The high-torque power head can be equipped with an independent hydraulic pump station trolley to independently supply high-pressure hydraulic oil to the power head to output high torque;

[0086] (2) Regarding the contradiction between the volume of the power head and the travel space of the pile driver:

[0087] The flattened power head structure is adopted, and the hydraulic motor of the power head adopts a flat installation structure, which reduces the height dimension of the power head. It can further reduce the overall height of the pile driver while ensuring the effective travel space of the pile driver. With the multi-channel telescopic drill rod, it can realize efficient and accurate construction operations in a limited space.

[0088] (3) The adaptability of drilling tools in construction technology in narrow spaces:

[0089] Multi-channel telescopic drill rods are used to construct multi-fluid channels, so that the telescopic drill rods can be used with a variety of process drill bits, and a variety of pile foundation construction processes can be completed on one pile driver, including bored pile construction, mixing pile construction, high-pressure jet grouting pile construction, and threaded expanded steel pile construction, which greatly improves the applicability and versatility of the pile driver and can meet diverse construction needs;

[0090] (4) Solved the problem of effective travel of pile driver drill bit:

[0091] Three devices are set up to increase the stroke. The first is a multi-channel telescopic drill rod. The second is a gear lifting device between the main mast and the power head, which enables the power head to move up and down. The third is a clamp that holds the main mast and the cylinder on the clamp, which drives the main mast to move up and down through the extension and contraction of the cylinder.

[0092] The present invention and its embodiments have been schematically described above. Such description is not restrictive. What is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if those of ordinary skill in the art are inspired thereby and design, without creative efforts, structural modes and embodiments similar to the technical solution without departing from the gist of the present invention, they shall fall within the protection scope of the present invention.

Claims

1. A multifunctional pile driver in a limited micro space, characterized in that: The invention comprises a mainframe assembly (100), a drill frame assembly, a power head assembly (300), a multi-channel telescopic drill rod (400) and a process drill bit (500), wherein the drill frame assembly is arranged on the mainframe assembly (100), the power head assembly (300) is mounted on the drill frame assembly, the multi-channel telescopic drill rod (400) is mounted on the power head assembly (300), and the process drill bit (500) is mounted on the multi-channel telescopic drill rod (400); wherein: The power head assembly (300) comprises a box (31), a telescopic drive hydraulic motor (32), a drill rod drive hydraulic motor (33), a multi-channel flow divider (34), a drill rod rotary joint (35) and a screw drive joint (36) installed on the box (31); the box (31) is installed on the drilling rig assembly; the telescopic drive hydraulic motor (32) is connected to the screw drive joint (36) through a screw drive transmission mechanism (38); the drill rod drive hydraulic motor (33) is connected to the drill rod rotary joint (35) through a drill rod drive transmission mechanism (37); and the multi-channel flow divider (34) is arranged at the upper end of the screw drive joint (36); The multi-channel telescopic drill rod (400) comprises a primary fixed rod body (41), an intermediate telescopic rod body (42), a final telescopic rod body (43), a primary screw (45), an intermediate transmission screw (46) and a corrugated telescopic tube (48). The primary fixed rod body (41), the intermediate telescopic rod body (42) and the final telescopic rod body (43) are sleeved together in stages from outside to inside, and the telescopic rod bodies of each stage are axially locked relative to the primary fixed rod body (41). The primary screw (45) and the intermediate transmission screw (46) are arranged on the inner side of the primary fixed rod body (41), the intermediate telescopic rod body (42) and the final telescopic rod body (43), and the primary screw (45) and the intermediate transmission screws (46) of each stage are sleeved together in stages from inside to outside through threads. The intermediate transmission screws (46) of each stage are connected to the intermediate telescopic rod body (42) of the corresponding stage through an annular servomotor (47) for relative rotation. The primary screw (45) and the intermediate transmission screws (46) of each stage are sleeved together in stages through threads. The intermediate transmission screw rod (46) is threadedly matched with the corresponding next-stage intermediate telescopic rod body (42) and the final telescopic rod body (43); the upper end of the first-stage fixed rod body (41) is connected to the drill rod rotary joint (35) for driving the multi-channel telescopic drill rod (400) to rotate; the upper end of the first-stage screw rod (45) is connected to the screw driving joint (36) for driving the multi-channel telescopic drill rod (400) to telescopically move; the first-stage screw rod (45) is provided with a plurality of fluid channels (45-1) connected to the corresponding diversion channels (34-3) in the multi-channel diverter (34); the upper end of the corrugated telescopic tube (48) is connected to the lower end of the first-stage screw rod (45) through the multi-channel rotary joint (48-1), and a tube channel corresponding to the above-mentioned fluid channel (45-1) is formed from the inner to the outer ring sleeve, and each tube channel is connected to the corresponding channel opening (43-1) at the lower end of the final telescopic rod body (43); The process drill bit (500) is installed at the lower end of the final telescopic rod body (43) directly or through an extension section, and the corresponding lumen in the process drill bit (500) is connected to the corresponding channel opening (43-1) on the final telescopic rod body (43).

2. The multifunctional pile driver in limited micro space according to claim 1, characterized in that: The main machine assembly (100) comprises a walking mechanism (11), a working platform (12), a leg assembly (13), a hydraulic drive system (14) and a background control system (15); the working platform (12) is mounted on the walking mechanism (11); the hydraulic drive system (14) and the background control system (15) are respectively integrated on the working platform (12); the drilling frame assembly is mounted on the front side of the working platform (12); the leg assembly (13) is mounted on the outside of the working platform (12); and a hole-opening fixture (134) is provided on the leg assembly (13).

3. The multifunctional pile driver in limited micro space according to claim 2, characterized in that: The leg assembly (13) comprises a cylinder bracket (131), a telescopic cylinder (132) and a support plate (133); the cylinder bracket (131) is fixed on the working platform (12); the telescopic cylinder (132) is vertically mounted on the cylinder bracket (131); the support plate (133) is fixed to the lower end of the telescopic cylinder (132); and the opening fixture (134) is mounted on the support plate (133).

4. The multifunctional pile driver in limited micro space according to claim 3 is characterized in that: The hole-opening fixer (134) comprises a rotating oil cylinder (1341) and a rotating anchor claw (1342) fixed to the lower end of the output shaft of the rotating oil cylinder (1341); the output shaft of the rotating oil cylinder (1341) has a dust suction channel (1343); and the upper part of the cylinder body of the rotating oil cylinder (1341) is provided with a dust suction pipe joint (1344) connected to the dust suction channel (1343).

5. The multifunctional pile driver in a limited micro space according to any one of claims 1 to 4, characterized in that: The drilling frame assembly is a mast drill lifting assembly (200) or a foldable mechanical arm assembly (200').

6. The multifunctional pile driver in a limited micro space according to any one of claims 1 to 4, characterized in that: The upper ends of the intermediate transmission screws (46) of each level are provided with screw connecting parts (46-1), and the upper ends of the intermediate telescopic rods (42) of each level are provided with intermediate rod connecting parts (42-1). The screw connecting parts (46-1) are sleeved on the outer sides of the corresponding intermediate rod connecting parts (42-1), and the annular relay (47) is arranged between the corresponding screw connecting parts (46-1) and the intermediate rod connecting parts (42-1) to realize axial connection and relative rotation between the screw connecting parts (46-1) and the intermediate rod connecting parts (42-1).

7. The multifunctional pile driver in limited micro space according to claim 6, characterized in that: The first-stage fixed rod body (41), the intermediate telescopic rod body (42) and the final telescopic rod body (43) are all cylindrical structures, and anti-rotation guide ribs (44) are provided between the first-stage fixed rod body (41) and the adjacent intermediate telescopic rod body (42), between the intermediate telescopic rod bodies (42) of each stage, and between the final telescopic rod body (43) and the adjacent intermediate telescopic rod body (42).

8. The multifunctional pile driver in a limited micro space according to any one of claims 1 to 4, characterized in that: The telescopic driving hydraulic motor (32) and the drill rod driving hydraulic motor (33) are respectively installed flat on the side walls of the box (31), and the telescopic driving hydraulic motor (32) and the drill rod driving hydraulic motor (33) are respectively arranged on both sides of the box (31).

9. The multifunctional pile driver in limited micro space according to claim 8, characterized in that: The screw drive joint (36) is a hollow rotating shaft, the upper end of which protrudes out of the box body (31). The multi-channel flow divider (34) comprises a rotary flow divider seat (34-1) and a channel tube (34-2). The channel tube (34-2) is sleeved on the inner side of the screw drive joint (36) to form a concentric annular distribution of flow divider channels (34-3). The rotary flow divider seat (34-1) is rotatably mounted on the upper end of the screw drive joint (36). The rotary flow divider seat (34-1) is provided with a pipe joint connected to the corresponding flow divider channel (34-3).

10. The multifunctional pile driver in a limited micro space according to any one of claims 1 to 4, characterized in that: The process drill bit (500) comprises one of a drilling drill bit (510), a mixing pile drill bit (520), a high-pressure jetting drill bit (530) and a threaded enlarged steel pile drill bit (540), wherein: The drilling drill bit (510) comprises a drilling drill tip (511) and a plurality of spiral wing plates (512) located on the upper portion of the drilling drill tip (511). The drilling drill bit (510) is also provided with at least two fluid inlets and outlets (513) which are axially spaced and communicated with corresponding lumens. The fluid inlets and outlets (513) are matched with detachable plugs (514). Different drilling cycle processes are formed by plugging different fluid inlets and outlets (513). The stirring pile drill bit (520) comprises a stirring drill tip (521) and a plurality of stirring blades (522) distributed on the side of the stirring pile drill bit (520); the stirring pile drill bit (520) is also provided with at least two fluid nozzles (523) which are axially spaced and connected to corresponding lumens; The high-pressure jet grouting drill bit (530) comprises a jet grouting drill tip (531) and at least one high-pressure nozzle (532) connected to a corresponding lumen; The upper end of the threaded enlarged steel pile drill bit (540) is provided with a steel pile joint (541), and the steel pile joint (541) is fixed to the lower end of the final telescopic rod body (43). The steel pile joint (541) and the threaded enlarged steel pile drill bit (540) are plug-fitted with a non-circular cross-section axial hole.

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