Limited micro-space multifunctional piling machine

Abstract

The invention discloses a limited micro-space multifunctional piling machine, and belongs to the technical field of piling machines. The limited micro-space multifunctional pile machine comprises a main machine assembly, a drilling rig assembly, a power head assembly, a multi-channel telescopic drill rod and a process drill bit, and the power head assembly comprises a box body, a telescopic driving hydraulic motor, a drill rod driving hydraulic motor, a multi-channel flow divider, a drill rod rotating joint and a screw driving joint, and the telescopic driving hydraulic motor, the drill rod driving hydraulic motor, the multi-channel flow divider, the drill rod rotating joint and the screw driving joint are installed on the box body. The multi-channel telescopic drill rod is controlled to rotate and stretch through the dual-drive power head, so that the overall height of the pile machine can be effectively reduced, low-clearance pile foundation construction can be achieved, multiple fluid channels are constructed in the multi-channel telescopic drill rod, the telescopic drill rod can be matched with drill bits of various technologies, and the construction efficiency is improved. Various pile foundation construction technologies are completed on one pile machine, and the blank of a multifunctional pile machine is filled. In addition, due to the design that the multi-channel shunting power head is matched with the multi-channel telescopic drill rod, rod connecting operation can be reduced or not needed, construction complexity is reduced, and construction efficiency is improved.

Description

Technical Field

[0001] The invention relates to a pile driver for engineering pile construction, and more particularly to a multifunctional pile driver in a limited micro space. Background Art

[0002] A low-headroom drilling rig is a construction equipment designed for limited spaces. It can perform effective drilling operations in highly restricted environments. With the acceleration of urbanization, infrastructure construction often encounters the need to carry out pile foundation construction in limited spaces, such as under viaducts, inside buildings, or in dense urban environments. Traditional drilling rigs are difficult to use or even impossible to use in these scenarios due to their large size and poor maneuverability.

[0003] Although some low-headroom technologies have met the needs of low-headroom construction to a certain extent, there are still some problems and shortcomings. First, the structure of some low-headroom drilling rigs is complex, which makes operation and maintenance more difficult. Secondly, the mobility and flexibility of some equipment still need to be improved to adapt to a more variable construction environment. 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, there are the following problems:

[0004] (1) Drill rod connection efficiency problem: In the prior art, for example, the “Low Headroom Double Rotary Drilling Rig and Construction Method Thereof” disclosed in Chinese Patent No. ZL201711385608.0 (authorization announcement date is April 9, 2024), its drill rods usually need to be connected section by section, which not only increases the complexity of construction, but also significantly reduces construction efficiency.

[0005] (2) Lack of multifunctional pile drivers: There is currently a lack of multifunctional pile drivers on the market that can adapt to a variety of foundation processes. Many devices are often designed only for specific types of construction processes and lack flexibility and adaptability. For example, the "Specialized split-disassembly and assembly-type pile driver and method for foundation reinforcement in limited spaces" disclosed in Chinese Patent No. ZL202110400327.8 (authorization announcement date is July 28, 2023), although it has achieved versatility to a certain extent, its construction in a limited space mainly relies on its disassembly and assembly structure design. In actual operation, it needs to be assembled on-site to form a pile driver, and it needs to be disassembled after the construction is completed. The construction operation is relatively complicated, and there are still limitations in actual use.

[0006] (3) The contradiction between narrow space and high torque demand: When carrying out construction in a narrow space, smaller equipment is usually required, but at the same time, construction often requires high-torque equipment to ensure drilling efficiency, which creates a contradiction between the dual demands for equipment size and performance. For example, the "front-rear displacement low-headroom drilling rig" disclosed in Chinese patent No. ZL201610702344.6 (authorization announcement date is October 25, 2019), the drilling part is installed on the gantry, and the resistance generated by the drill bit drilling will react on the gantry. However, due to structural reasons, the gantry can only withstand limited torque, so the construction efficiency is difficult to improve, especially when encountering hard soil layers that require greater torque, a gantry with higher structural strength is required to meet the construction needs.

[0007] (4) The contradiction between the volume of the power head and the travel space of the pile driver: In a limited space, the volume of the power head often occupies precious construction space, limiting the travel and construction range of the pile driver. For example, the "A telescopic drill rod and a mixing pile driver with a telescopic drill rod" disclosed in Chinese Patent No. ZL201511021903.9 (authorization announcement date is June 29, 2018) has a large slewing mechanism, which limits its construction operation in a limited space.

[0008] (5) The problem of drill tool adaptability in construction processes in narrow spaces: When carrying out a variety of construction processes in a narrow space, there is a lack of highly adaptable drill tools. For example, the "Application method of a comprehensive device for the construction of rotary-pressed and twisted composite piles under ultra-low clearance" disclosed in Chinese Patent No. ZL202410013409.0 (authorization announcement date is October 25, 2019) mainly improves the power head of the pile driver to enable it to pile and bore by rotation, pressure rotation, torsion, vibration, down-the-hole hammer, top hammer, etc. However, it mainly cooperates with the drilling bit to achieve pile and bore in various complex formations under ultra-low clearance. It is only suitable for specific construction environments and pile-forming processes and is difficult to meet diverse construction needs. Summary of the invention

[0009] 1. Technical problem 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 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.

[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 rod comprises a primary fixed rod body, an intermediate telescopic rod body, a final telescopic rod body, a primary screw, an intermediate transmission screw and a corrugated telescopic tube. The primary fixed rod body, the intermediate telescopic rod body and the final telescopic rod body are sleeved together step by step from the outside to the inside, and the telescopic rod bodies of each stage are axially locked relative to the primary fixed rod body; the primary screw and the intermediate transmission screw are arranged on the inner side of the primary fixed rod body, the intermediate telescopic rod body and the final telescopic rod body, and the primary screw and the intermediate transmission screws of each stage are threadedly sleeved together step by step from the inside to the outside; the intermediate transmission screws of each stage are relatively rotatably connected with the intermediate telescopic rod body of the corresponding stage through an annular relay, and the primary screw and the intermediate transmission screws of each stage are relatively locked relative to the intermediate transmission screw body of the corresponding stage through an annular relay. The intermediate transmission screws are all threadedly matched with the corresponding intermediate telescopic rod bodies of the next stage and the final telescopic rod bodies; the upper end of the first-stage fixed rod body is connected to the drill rod rotary joint, which is used to drive the multi-channel telescopic drill rod to rotate; the upper end of the first-stage screw is connected to the screw drive joint, which is used to drive the multi-channel telescopic drill rod to telescope; the first-stage screw is provided with a plurality of fluid channels connected to the corresponding diversion channels in the multi-channel diverter; the upper end of the corrugated telescopic tube is connected to the lower end of the first-stage screw through the multi-channel rotary joint, and the ring sleeve from the inside to the outside forms a pipe channel corresponding to the above-mentioned fluid channel, and each pipe channel is connected to the corresponding channel opening at the lower end of the final telescopic rod body;

[0016] The process drill bit is directly or through an extension section mounted on the lower end of the final telescopic rod body, and the corresponding tube cavity in the process drill bit is communicated with the corresponding channel opening on the final telescopic rod body.

[0017] Furthermore, the main engine assembly includes a walking mechanism, a working platform, a leg assembly, a hydraulic drive system and a background control system. The working platform is installed on the walking mechanism, the hydraulic drive system and the background control system are respectively integrated on the working platform, the drilling 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 the leg assembly is provided with a hole fixing device.

[0018] Furthermore, the leg assembly includes a cylinder bracket, a telescopic cylinder and a support plate, the cylinder bracket is fixed on the working platform, the telescopic cylinder is vertically installed on the cylinder bracket, the support plate is fixed to the lower end of the telescopic cylinder, and the opening fixture is installed on the support plate.

[0019] Furthermore, the hole fixing device includes a rotating oil cylinder and a rotating anchoring claw fixed to the lower end of the rotating oil cylinder output shaft, the output shaft of the rotating oil cylinder has a dust suction channel, and the upper part of the cylinder body of the rotating oil cylinder is provided with a dust suction pipe joint connected to the dust suction channel.

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

[0021] Furthermore, the upper end of each level of the intermediate transmission screw is provided with a screw connecting part, and the upper end of each level of the intermediate telescopic rod body is provided with an intermediate rod body connecting part, the screw connecting part is sleeved on the outside of the corresponding intermediate rod body connecting part, and the annular relay is arranged between the corresponding screw connecting part and the intermediate rod body connecting part to realize axial connection and relative rotation between the screw connecting part and the intermediate rod body connecting part.

[0022] Furthermore, the first-stage fixed rod body, the intermediate telescopic rod body and the final telescopic rod body are all cylindrical structures, and anti-rotation guide ribs are provided between the first-stage fixed rod body and the adjacent intermediate telescopic rod body, between the intermediate telescopic rod bodies of each stage, and between the final telescopic rod body and the adjacent intermediate telescopic rod body.

[0023] Furthermore, the telescopic driving hydraulic motor and the drill rod driving hydraulic motor are 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.

[0024] Furthermore, the screw drive joint is a hollow rotating shaft, the upper end of which extends out of the box body, and the multi-channel diverter includes a rotary diverter seat and a channel tube, the channel tube is sleeved on the inner side of the screw drive joint to form a concentric annularly distributed diverter channel, the rotary diverter seat is rotatably installed on the upper end of the screw drive joint, and the rotary diverter seat is provided with a pipe joint connected to the corresponding diverter channel.

[0025] Furthermore, the process drill bit includes one of a drilling drill bit, a mixing pile drill bit, a high-pressure jetting drill bit and a thread enlarged steel pile drill bit, wherein:

[0026] The drilling drill bit has a drilling drill tip and a plurality of spiral wing plates located on the upper portion of the drilling drill tip. The drilling drill bit is also provided with at least two fluid inlets and outlets axially spaced and connected to the corresponding lumens. The fluid inlets and outlets are equipped with detachable plugs, and different drilling circulation processes are formed by plugging different fluid inlets and outlets.

[0027] The mixing pile drill bit has a mixing drill tip and a plurality of mixing blades distributed on the side of the mixing pile drill bit, and the mixing pile drill bit is also provided with at least two fluid nozzles arranged axially at intervals and connected to corresponding lumens;

[0028] The high-pressure jet grouting drill bit comprises a jet grouting drill tip and at least one high-pressure nozzle connected to a corresponding lumen;

[0029] The upper end of the threaded enlarged steel pile drill bit is provided with a steel pile joint, which is fixed to the lower end of the final telescopic rod body. The steel pile joint and the threaded enlarged steel pile drill bit are plug-fitted with a non-circular cross-section axial hole.

[0030] 3. Beneficial effects

[0031] Compared with the existing known technologies, the technical solution provided by the present invention has the following significant effects:

[0032] (1) 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 power head assembly comprises a housing, 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 housing, and the multi-channel telescopic drill rod comprises a primary fixed rod body, an intermediate telescopic rod body, a final telescopic rod body, a primary screw, an intermediate transmission screw and a corrugated telescopic tube; the power head is a dual-drive power head, which can rotate and telescope the multi-channel telescopic drill rod, so that the overall height of the pile driver can be adjusted. The pressure drop is effectively reduced, and low-headroom pile foundation construction can be realized. In addition, the telescopic structure design is used in conjunction with the corrugated telescopic tube to cleverly construct multiple fluid channels in the multi-channel telescopic drill rod, which not only ensures the accuracy and stability of the drill rod telescopic motion control, and improves the verticality and precision of the construction drill rod, but also enables the telescopic drill rod to be matched with a variety of process drill bits, so that a variety of pile foundation construction processes can be completed on one pile driver, filling the gap of multi-functional pile drivers. In addition, the multi-channel shunt power head combined with the multi-channel telescopic drill rod design can reduce or eliminate the need for connecting rod operation, reduce construction complexity, and improve construction efficiency.

[0033] (2) A multifunctional pile driver in a limited micro space of the present invention comprises a main engine assembly including a walking 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 space occupation. The main engine assembly has the advantages of flexible movement, diverse application scenarios and convenient construction in a limited space. A hole-opening fixture is provided on the leg assembly, and the main engine can be firmly fixed on the ground by the hole-opening fixture, which can effectively overcome the torque generated by the high-torque power head, effectively improve the output torque of the pile driver, improve the construction efficiency, and solve the contradiction between the existing small-space pile driver and the high-torque demand.

[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) The invention provides a multifunctional pile driver in a limited micro space, wherein the process drill bit comprises a drilling drill bit, a mixing pile drill bit, a high-pressure rotary jet drill bit and a threaded enlarged body steel pile drill bit. The pile driver can realize bored cast-in-place pile construction, mixing pile construction, high-pressure rotary jet pile construction and threaded enlarged body steel pile construction, thereby greatly improving the applicability and versatility of the pile driver and meeting diversified construction needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a three-dimensional structural schematic diagram of a multifunctional pile driver with limited micro space according to the present invention;

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

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

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

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

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

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

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

[0047] FIG9( a ) is a schematic diagram of a three-dimensional structure of a multi-channel telescopic drill rod used in conjunction with a drilling drill bit in the present invention;

[0048] FIG9( b ) is a cross-sectional view of the multi-channel telescopic drill rod used in conjunction with a drilling drill bit in the present invention;

[0049] Fig.10 A construction state reference diagram of a multifunctional pile driver in a limited micro space in accordance with the present invention in cooperation with a drilling drill bit;

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

[0051] FIG11( b ) is a cross-sectional view of the multi-channel telescopic drill rod used in conjunction with a mixing pile drill bit in the present invention;

[0052] Fig.12 A construction state reference diagram of a multifunctional pile driver with limited micro space and a mixing pile drill bit according to the present invention;

[0053] FIG13( a ) is a schematic diagram of a three-dimensional structure of a multi-channel telescopic drill rod used in conjunction with a high-pressure jet jet drill bit in the present invention;

[0054] FIG13( b ) is a cross-sectional view of the multi-channel telescopic drill rod used in conjunction with a high-pressure jet jet drill bit in the present invention;

[0055] Fig.14 A construction state reference diagram of a multifunctional pile driver in a limited micro space in accordance with the present invention in combination with a high-pressure jet grouting drill bit;

[0056] FIG. 15( a ) is a schematic diagram of a combined state of a multi-channel telescopic drill rod and a threaded enlarged steel pile drill bit according to the present invention;

[0057] FIG. 15( b ) is a schematic diagram of the disassembled state of the multi-channel telescopic drill rod in the present invention in combination with the thread enlarged steel pile drill bit.

[0058] Fig.16 A reference diagram of the construction state of a multifunctional pile driver with limited micro space and a steel pile drill bit with an enlarged thread body according to the present invention;

[0059] Fig.17 It is a three-dimensional structural schematic diagram of a leg assembly in a limited micro-space multifunctional pile driver of the present invention;

[0060] Fig.18 It is a schematic diagram of the three-dimensional structure of a hole opening fixture in a multifunctional pile driver with limited micro space according to the present invention;

[0061] Fig.19 It is a schematic cross-sectional view of a hole-opening fixture in a multifunctional pile driver in a limited micro space according to the present invention;

[0062] Fig. 20 The present invention is a structural schematic diagram of a multifunctional pile driver in a limited micro space using a foldable mechanical arm.

[0063] Explanation of the symbols in the schematic diagram:

[0064] 100, main engine assembly; 11, walking mechanism; 12, working platform; 13, outrigger assembly; 131, cylinder bracket; 132, telescopic cylinder; 133, support plate; 134, hole fixing device; 1341, rotating cylinder; 1342, rotating anchor claw; 1343, dust suction channel; 1344, dust suction pipe joint; 14, hydraulic drive system; 15, backstage control system; 200, mast drilling assembly; 200', foldable mechanical arm assembly; 300, power head assembly; 31, box; 32, telescopic drive hydraulic motor; 33, drill rod drive hydraulic motor; 34, multi-channel diverter; 34-1, rotary diverter seat; 34-2, channel pipe; 34-3, diversion channel; 35, drill rod rotary joint; 36, screw drive joint; 37, drill rod drive transmission mechanism; 38, screw drive transmission mechanism; 40 0. Multi-channel telescopic drill rod; 41. Primary fixed rod body; 42. Intermediate telescopic rod body; 42-1. Intermediate rod body connection part; 43. Final telescopic rod body; 43-1. Channel opening; 44. Anti-rotation guide rib; 45. Primary screw; 45-1. Fluid channel; 46. Intermediate transmission screw; 46-1. Screw connection part; 47. Annular relay; 48. Corrugated telescopic tube; 48-1. Multi-channel rotary joint; 500. Process drill bit; 510. Drilling drill bit; 511. 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 jet drill bit; 531. Jet drill tip; 532. High-pressure nozzle; 540. Threaded enlarged steel pile drill bit; 541. Steel pile joint. DETAILED DESCRIPTION

[0065] In order to further understand the content of the present invention, the present invention is described in detail in conjunction with the accompanying drawings and embodiments.

[0066] [Example]

[0067] Combination Figure 1 As shown, a multifunctional pile driver in a limited micro space of this embodiment includes a main engine assembly 100, a drill frame assembly, a power head assembly 300, a multi-channel telescopic drill rod 400 and a process drill bit 500. The main engine assembly 100 serves as the basic platform of the pile driver and plays a supporting role; the drill frame assembly is arranged on the main engine assembly 100 and can construct pile foundations at a certain angle, mainly used for drilling or lifting drills; the power head assembly 300 is installed on the drill frame assembly and is used to drive the drill to rotate; the multi-channel telescopic drill rod 400 is installed on the power head assembly 300 and can telescopically move to cooperate with drilling or lifting drills, reducing or avoiding connecting rod operations; the process drill bit 500 is installed on the multi-channel telescopic drill rod 400 and is used to realize the construction of different pile driver processes. Among them,

[0068] Reference Figures 2 to 4As shown, the power head assembly 300 includes a box body 31, and a telescopic driving hydraulic motor 32, a drill rod driving hydraulic motor 33, a multi-channel diverter 34, a drill rod rotating joint 35 and a screw driving joint 36 installed on the box body 31. The box body 31 is installed on the drilling frame assembly. The telescopic driving hydraulic motor 32, the drill rod driving hydraulic motor 33, the multi-channel diverter 34, the drill rod rotating joint 35 and the screw driving joint 36 are all arranged on the box body 31. The telescopic driving hydraulic motor 32 is connected to the screw driving joint 36 through a screw driving transmission mechanism 38, and can drive the screw driving joint 36 to independently drive the screw driving joint 36. The multi-channel telescopic drill rod 400 is vertically rotated to control the extension and retraction of the multi-channel telescopic drill rod 400; the drill rod driving hydraulic motor 33 is connected to the drill rod rotating joint 35 through the drill rod driving transmission mechanism 37, and can drive the drill rod rotating joint 35 to rotate independently, so as to control the overall rotation of the multi-channel telescopic drill rod 400; the multi-channel diverter 34 is arranged at the upper end of the screw driving joint 36, and is used to connect the ground fluid pipeline, so as to input the fluid medium into the process drill bit 500 or discharge the fluid medium through the process drill bit 500 according to different pile foundation construction processes; the drill rod rotating joint 35 is located on the outside of the screw driving joint 36, and it is better to set the two coaxially.

[0069] Reference Figures 5 to 8As shown, 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 bellows 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 step by step from outside to inside, and the telescopic rod bodies of each level are axially fixed relative to the primary fixed rod body 41, that is, the intermediate telescopic rod bodies 42 and the final telescopic rod body 43 of each level can only telescopically move relative to each other but cannot rotate relative to each other, and the diameter of each rod body gradually decreases from the primary fixed rod body 41 to the final telescopic rod body 43. 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 level are sleeved together step by step from inside to outside, that is, the diameter of the primary screw 45 and the intermediate transmission screws 46 of each level increases step by step. The intermediate transmission screws 46 of each level are connected to the intermediate telescopic rod body 42 of the corresponding level through the annular relay 47 for relative rotation, so that the intermediate transmission screws 46 and the intermediate telescopic rod body 42 of the corresponding level can rotate relative to each other but cannot move axially; the primary screw 45 and the intermediate transmission screws 46 of each level are threadedly matched with the corresponding intermediate telescopic rod body 42 of the next level and the final telescopic rod body 43, and the telescopic rod bodies of each level are driven to rotate and move axially relative to the primary fixed rod body 41 by driving the primary screw 45 to rotate. The primary screw 45 and the primary fixed rod body 41 can rotate relative to each other and the axial movement is also restricted. The upper end of the primary fixed rod body 41 is connected to the drill rod rotary joint 35, which is used to drive the multi-channel telescopic drill rod 400 to rotate; the upper end of the primary screw 45 is connected to the screw drive joint 36, which is used to drive the multi-channel telescopic drill rod 400 to telescopic movement. When the screw drive joint 36 drives the primary screw 45 to rotate, the secondary intermediate telescopic rod body 42 moves axially on the primary screw 45, driving the intermediate transmission screw 46 of the same level to move axially together. Since the secondary intermediate transmission screw 46 is threadedly matched with the primary screw 45, the secondary intermediate transmission screw 46 also rotates together at this time; the secondary intermediate transmission screw 46 rotates to drive the intermediate telescopic rod body 42 of the next level to move axially, and at the same time drives the intermediate transmission screw 46 of the next level to move axially and rotationally, and transmits step by step until the final telescopic rod body 43 is driven to move axially. In this way, the intermediate telescopic rod bodies 42 of each level and the final telescopic rod body 43 can synchronously telescope axially relative to the primary fixed rod body 41, ensuring the accuracy and stability of the telescopic motion control of the telescopic drill rod, and improving the verticality and precision of the construction drill rod. The number of intermediate telescopic rod bodies 42 and intermediate transmission screws 46 is equal, and the specific number can be determined according to the needs of the telescopic stroke. Figure 7 and Figure 8 As shown, the length of the multi-channel telescopic drill rod 400 after contraction is equivalent to the length of the primary fixed rod body 41. Figure 5 and Figure 6As shown, the maximum extension length can reach several times the length of the primary fixing rod 41. For the sake of illustration, Figures 5 to 8 The specific implementation scheme of setting two intermediate telescopic rod bodies 42 is given in the figure. The two intermediate telescopic rod bodies 42 are respectively a secondary intermediate telescopic rod body and a tertiary intermediate telescopic rod body. Correspondingly, the two intermediate transmission screws 46 are respectively a secondary transmission screw and a tertiary transmission screw. When the telescopic length of the telescopic drill rod needs to be increased, it can be achieved by increasing the number of sections of the intermediate telescopic rod body 42 and the intermediate transmission screw 46. The primary screw 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; specifically, the fluid channels 45-1 are provided with at least two channels from the inside to the outside on the primary screw 45, and each fluid channel 45-1 is distributed in an annular manner from the center to the outside. The upper end of the bellows 48 is connected to the lower end of the primary screw 45 through a multi-channel rotary joint 48-1, so that the primary screw 45 can rotate freely relative to the bellows 48 and maintain the connection sealing of each channel. The bellows 48 forms a tube channel corresponding to the above-mentioned fluid channel 45-1 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. In other words, the central tube cavity of the innermost bellows 48 is a fluid channel, and the annular interlayer between adjacent bellows 48 is a fluid channel. The number of fluid channels can be determined according to the number of ring sleeves of the bellows 48. The above-mentioned bellows 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, which realizes the relative rotation of the connected pipelines and can be used for the transportation of fluids such as gas and liquid. Multiple fluid channels are constructed in the telescopic drill rod by using the bellows telescopic tube 48 which is sleeved together. Not only is the structure simple and compact, and the manufacture and implementation are convenient, but the establishment of multiple fluid channels in the telescopic drill rod also makes it possible to cooperate with a variety of process drill bits 500, thereby greatly improving the applicability of the telescopic drill rod.

[0070] The process drill bit 500 is directly or through an extension section installed at the lower end of the final telescopic rod body 43, and the corresponding tube cavity in the process drill bit 500 is connected to the corresponding channel opening 43-1 on the final telescopic rod body 43. The multifunctional telescopic drilling tool formed by the above-mentioned telescopic drill rod in combination with a variety of process drill bits 500 can reduce the frequent rod connection operation by utilizing the multi-stage telescopic telescopic 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 drilling tool to establish different fluid channels, which can be used for bored pile construction, mixing pile construction, high-pressure rotary jet pile construction, and threaded expanded steel pile construction, etc., solving the adaptability problem of traditional pile drivers.

[0071] As can be seen from the above, the multifunctional pile driver in a limited micro space of the present embodiment has a dual-drive power head, which can control the rotation and extension of 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 realized. In addition, the telescopic structure design is used in conjunction with the corrugated telescopic tube to cleverly construct multiple fluid channels in the multi-channel telescopic drill rod, which not only ensures the accuracy and stability of the drill rod telescopic motion control, and improves the verticality and precision of the construction drill rod, but also enables the telescopic drill rod to be used with a variety of process drill bits, thereby realizing a variety of pile foundation construction processes on one pile driver, filling the gap in the multifunctional pile driver. In addition, the multi-channel shunt power head is used in conjunction with the multi-channel telescopic drill rod design, which can reduce or eliminate the need for connecting rod operation, reduces construction complexity, and improves construction efficiency.

[0072] catch Figure 1 As shown, a limited micro-space multifunctional pile driver of this embodiment, its main assembly 100 includes 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 installed on the walking mechanism 11, and the walking mechanism 11 can drive the entire pile driver to move. The walking mechanism 11 preferably adopts a crawler walking structure and can move in a complex environment; the working platform 12 preferably adopts a rotating platform, which can be horizontally rotated relative to the walking mechanism 11 to facilitate the adjustment of the construction direction and improve 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 is mainly composed 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 is mainly composed of an electrical control cabinet, etc. The hydraulic drive system 14 and the background control system 15 are respectively integrated on the working platform, which has a compact structure and occupies a small space. It has the advantages of flexible movement, diverse application scenarios, and convenient construction in a limited space. In addition, the drilling frame assembly is installed on the front side of the working platform 12, the leg assembly 13 is installed on the outside of the working platform 12, and the leg assembly 13 is provided with a hole fixing device 134. Preferably, the leg assembly 13 is provided with two groups on the left and right sides of the working platform 12, respectively. By using the hole fixing devices 134 on the leg assembly 13, the main machine can be firmly fixed on the ground, and the torque generated by the high-torque power head can be effectively overcome, and the output torque of the pile driver can be effectively increased, which improves the construction efficiency and solves the contradiction between the existing small-space pile driver and the high-torque demand.

[0073] Specifically, refer to Figures 17 to 19As shown, the outrigger assembly 13 includes 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 hole fixture 134 is mounted on the support plate 133. The telescopic outrigger structure can be used to conveniently control the outrigger, and the support plate 133 can increase the ground contact area and improve the support stability. Multiple hole fixtures 134 can be set on the support plate 133, such as Fig.17 Four sets of opening fixtures 134 are provided. Furthermore, the hole-opening fixture 134 comprises a rotating oil cylinder 1341 and a rotating anchoring claw 1342 fixed at the lower end of the output shaft of the rotating oil cylinder 1341, the rotating anchoring claw 1342 is provided with an alloy cutting tool, the rotating oil cylinder 1341 drives the rotating anchoring claw 1342 to rotate to break the ground, and as the telescopic oil cylinder 13 is pressed downward, the rotating anchoring claw 1342 can be anchored into the ground, so that the rotating anchoring claw can quickly break and anchor into the formation, thereby increasing the grip of the main machine; in addition, 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, the upper part of the cylinder body of the rotating 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 rotating oil cylinder 1341, so that the output shaft can rotate freely and keep the dust suction channel 1343 unobstructed. The above design can suck out and collect dust while the anchor claw breaks the ground, reducing environmental pollution caused by dust at the construction site. The rotating anchor claw 1342 can adopt a four-petal structure. When working, the rotating oil cylinder 1341 (or hydraulic motor) drives the four-petal alloy rotating anchor claw 1342 to rotate at high speed to cut the ground. While cutting the bottom ground, the vacuum pump sucks away the debris formed by the rotating anchor claw 1342 through the dust suction channel 1343 to avoid polluting the environment. In addition, an expansion oil cylinder for driving the rotating anchor claw 1342 to expand can be provided on the above-mentioned hole fixing device 134. After the hole is formed, the expansion oil cylinder pushes downward to compress the four-petal rotating anchor claw 1342 to expand and tighten, thereby firmly fixing the main machine on the ground.

[0074] In this embodiment, the drill frame assembly may be a mast drill lifting assembly 200 or a foldable mechanical arm assembly 200 ′, and drill frames of different structural forms may be selected according to the construction space. Figure 1The structure shown is a mast drill lifting assembly 200, which has the advantages of small footprint, light and labor-saving use, and easy maintenance. It is mainly composed of a main mast, a main mast clamp, a clamp cylinder, and a hydraulic winch. The main mast clamp is installed on the working platform 12 through a boom and a cylinder. The boom and the cylinder can be used to control the pile angle. The main mast is installed on the main mast clamp, and the clamp cylinder clamps the main mast. The hydraulic winch is installed on the main mast and connected to the power head assembly 300. The box 31 of the power head assembly 300 is slidably arranged on the main mast and can be controlled to move up and down on the main mast by the hydraulic winch. Fig. 20 The structure shown is a foldable mechanical arm assembly 200', which can be extended into a narrow space for construction, meeting the construction needs of some special scenes. It is mainly composed of 2 to 3 folding arms, and the rotation angle is controlled by a hydraulic cylinder. The structure is similar to the digging arm of the existing excavator. When the foldable mechanical arm assembly 200' is used, the box 31 of the power head assembly 300 is hinged at the free end of the foldable mechanical arm assembly 200', and the relative angle between the two can be controlled by a hydraulic cylinder. The above-mentioned mast drilling assembly 200 and foldable mechanical arm assembly 200' are similar to the prior art, and their specific structure and action principle will not be described in detail here.

[0075] Reference Figure 6 As shown, in this embodiment, for the multi-channel telescopic drill rod 400, 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 rod bodies 42 of each level are provided with intermediate rod body connecting parts 42-1. The screw connecting parts 46-1 are sleeved on the outer sides of the corresponding intermediate rod body connecting parts 42-1, and the annular relay 47 is provided between the corresponding screw connecting parts 46-1 and the intermediate rod body connecting parts 42-1 to realize the axial connection and relative rotation of the screw connecting parts 46-1 and the intermediate rod body connecting parts 42-1. The diameter of the screw connecting part 46-1 is slightly larger than the diameter of the intermediate transmission screw 46, the cross section of the intermediate rod body connecting part 42-1 is inverted "U" shape, and the inner free end of the intermediate rod body connecting part 42-1 is sleeved on the inner side of the screw connecting part 46-1, so that the screw connecting part 46-1 and the intermediate rod body connecting part 42-1 are connected, and the inner free end of the intermediate rod body connecting part 42-1 can also be used to realize the threaded connection with the corresponding screw, so as to cleverly realize the synchronous telescopic movement of the telescopic rod body. The above-mentioned annular relay 47 is an annular structure, such as a steel ring, etc., and corresponding annular grooves are respectively provided between the screw connecting part 46-1 and the intermediate rod body connecting part 42-1. The annular relay 47 is located in the annular groove, so that the corresponding intermediate telescopic rod body 42 and the intermediate transmission screw 46 can be axially connected together to transmit axial force, while ensuring the free rotation of both. Of course, the annular relay 47 can also be a plurality of annularly distributed steel balls, etc.

[0076] like Figure 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 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. The cylindrical rod body is easy to manufacture, and after lowering the steel cage, a multi-channel telescopic drill rod can be inserted into the inner side of the steel cage for use as a grouting conduit. The anti-rotation guide ribs 44 are slidably matched with the corresponding guide grooves, so that the rod bodies of each stage can telescope smoothly and prevent relative rotation. As shown in FIG. Figure 6 and Figure 8 As shown, in this embodiment, the primary screw 45 is a hollow screw, and the fluid channel 45-1 is composed of concentric tubes that are sleeved layer by layer on the inner side of the primary screw 45. The concentric tubes are separated from the inner wall of the primary screw 45 and the adjacent concentric tubes are separated and connected together by spacers to ensure the smooth flow of the formed annular fluid channel 45-1, and the formed fluid channel 45-1 is conveniently corresponding to the tube channel formed by the corrugated telescopic tube 48 through the multi-channel rotary joint 48-1.

[0077] Reference Figure 2 and Figure 3 As shown, in this embodiment, for the power head assembly 300, the telescopic drive hydraulic motor 32 and the drill rod drive hydraulic motor 33 are respectively installed flat on the side walls of the box 31, and the telescopic drive hydraulic motor 32 and the drill rod drive hydraulic motor 33 are placed on both sides of the box 31. 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. In conjunction with a 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. The above-mentioned drill rod drive transmission mechanism 37 and screw drive transmission mechanism 38 both adopt planetary gear reduction mechanisms, which have compact structure, high transmission efficiency, and can withstand large loads. The planetary gear reduction mechanism is an existing reduction mechanism, so its specific structural principle will not be described in detail again. Figure 4As shown, the screw drive joint 36 is a hollow rotating shaft, the upper end of which extends out of the box body 31, and the multi-channel diverter 34 includes a rotary diverter 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 diverter channels 34-3, the rotary diverter seat 34-1 is rotatably mounted on the upper end of the screw drive joint 36, and the rotary diverter seat 34-1 is provided with a pipe joint connected to the corresponding diverter channel 34-3. A rotary sealed annular distribution cavity is also provided at the corresponding pipe joint, and each pipe joint can be connected to the corresponding diverter channel 34-3 through the corresponding annular distribution cavity, so that during the rotation of the screw drive joint 36, the rotary diverter seat 34-1 and the pipe joint thereon can be relatively fixed, so as to realize fluid diversion and prevent the fluid pipeline from being entangled.

[0078] Reference Figure 1 As shown, in this embodiment, the process drill bit 500 includes one of a drilling drill bit 510, a mixing pile drill bit 520, a high-pressure jetting drill bit 530, and a threaded enlarged body steel pile drill bit 540. A pile driver can realize bored cast-in-place pile construction, mixing pile construction, high-pressure jetting pile construction, and threaded enlarged body steel pile construction, which greatly improves the applicability and versatility of the pile driver and can meet diversified construction needs.

[0079] Figure 9(a), Figure 9(b) and Fig.10A multifunctional pile driver used in conjunction with a drilling drill bit 510 is shown. The drilling drill bit 510 has 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 spiral wing plates 512 are provided with a plurality of alloy cutters. The drilling drill bit 511 is also provided with at least two fluid inlets and outlets 513 arranged axially at intervals and connected to the corresponding lumens. The fluid inlets and outlets 513 are provided with detachable plugs 514. Different drilling circulation processes are formed by plugging different fluid inlets and outlets 513. During drilling construction, the drilling drill bit 510 is mainly driven by the power head assembly 300 and the multi-channel telescopic drill rod 400 to rotate and cut the soil body for drilling. There are two normal drilling mud circulations: positive circulation and reverse circulation. In the positive circulation, the mud is ejected from the bottom of the drill rod, driving the drill cuttings to be transported upward along the outer side of the drill rod to the ground for precipitation, thereby achieving drilling. The positive circulation drill bit is easily wrapped by the soil body and is easily stuck. In the reverse circulation, mud flows from the outer mud pool into the hole, and at the bottom of the 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 drilling. Since the reverse circulation process does not need to repeatedly crush the drill cuttings and directly suck the drill cuttings, its hole-forming efficiency is higher than that of the positive circulation. Its disadvantage is that the mud enters from the outer hole, which is easy to scour the hole wall, which is easy to cause the hole wall to be unstable and collapse. The drilling drill bit 510 in this embodiment is designed with dual channels, so a new mud circulation process can be adopted, which we call "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 mud and drill cuttings mixture formed is directly sucked to the ground through the fluid inlet and outlet 513 on the upper part of the drill bit and the second channel of the drill pipe by a vacuum pump. The hole-forming speed is fast, and at the same time, the mud is prevented from scouring the hole wall, which is easy to cause the hole wall to be unstable and collapse. In addition, when the "reverse circulation" process is not adopted, the fluid inlet and outlet 513 at the lower spiral wing plate 512 can be opened, and high-pressure gas can be sprayed from the bottom of the drill bit during reverse circulation drilling to assist in cutting the soil and prevent the soil from wrapping the drill bit and causing the drill to become stuck. In addition, during bored pile construction, after the hole is formed and the steel cage is lowered normally, the drilling drill bit 510 can be disassembled and the multi-channel telescopic drill rod 400 can be reinserted into the hole and used as a conduit, thereby avoiding the installation and disassembly of the grouting conduit in a narrow space and improving construction efficiency.

[0080] Figure 11(a), Figure 11(b) and Fig.12A multifunctional pile driver used in conjunction with a mixing pile drill bit 520 is shown. 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. The mixing pile drill bit 520 is also provided with at least two fluid nozzles 523 arranged axially spaced apart and connected to the corresponding lumens. During the construction of the mixing pile, the mixing pile drill bit 520 is mainly driven by the power head assembly 300 and the multi-channel telescopic drill rod 400 to rotate and mix the soil. At the same time, the curing agent and gas are transported through the fluid nozzle 523 through the multiple channels in the multi-channel telescopic drill rod 400 and the mixing pile drill bit 520, and mixed with the soil to form a mixing pile body.

[0081] Figure 13(a), Figure 13(b) and Fig.14 A multifunctional pile driver used in conjunction with a high-pressure jet grouting drill head 530 is shown. The high-pressure jet grouting drill head 530 has a jet grouting drill tip 531 and at least one high-pressure nozzle 532 connected to a corresponding lumen. During the construction of high-pressure jet grouting piles, the high-pressure jet grouting drill head 530 is mainly driven to rotate by the power head assembly 300 and the multi-channel telescopic drill rod 400, and the soil is cut by high-pressure curing agent fluid and gas. The curing agent and gas are transported through the high-pressure nozzle 532 through the multi-channel telescopic drill rod 400 and the multiple channels in the high-pressure jet grouting drill head 530, and mixed with the soil to form a high-pressure jet grouting pile body.

[0082] Figure 15(a), Figure 15(b) and Fig.16 The multifunctional pile driver used in conjunction with the threaded enlarged steel pile drill bit 540 is shown. The upper end of the threaded enlarged steel pile drill bit 540 is provided with a steel pile joint 541, which 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 plugged in with a non-circular cross-section shaft hole. For example, the steel pile joint 541 and the threaded enlarged steel pile drill bit 540 can be plugged in with a non-circular cross-section shaft hole such as a regular hexagon, so that torque transmission can be achieved and the threaded enlarged steel pile drill bit 540 can be easily separated after implantation. The threaded enlarged steel pile is constructed mainly by driving the threaded enlarged steel pile drill bit 540 to rotate and implant into the soil through the power head assembly 300 and the multi-channel telescopic drill rod 400. After that, the multi-channel telescopic drill rod 400 is lifted and separated from the first section of the threaded enlarged steel pile drill bit 540, and the second section of the threaded enlarged steel pile drill bit 540 is connected to continue the construction until the set elevation is reached, and the threaded enlarged steel pile is formed. The adjacent two sections of the threaded enlarged body steel pile drill bits 540 are also plug-in-fitted with non-circular cross-section axial holes.

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

Claims

1. A 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 (511) 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); and 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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