Power head device, pile driver and pile foundation construction method

Abstract

The present invention provides a power head device, a pile driver and a pile foundation construction method, which relate to the technical field of pile foundation construction. The power head device includes a power head, a first joint, a second joint, a drive assembly and a locking piece; the first joint is connected to the output end of the power head, and the second joint is provided at one end of the drill rod; the circumferential side wall of one of the first joint and the second joint is provided with a locking hole, and the circumferential side wall of the other is provided with a locking groove, and the locking hole and the locking groove are used to be connected to each other when the first joint and the second joint are plugged in, and the locking hole is exposed; the drive assembly is connected to the power head, and the locking piece is provided at the output end of the drive assembly, and the drive assembly is used to drive the locking piece to extend into or out of the corresponding connected locking hole and locking groove. The power head device can realize the plug-in fixation or mutual separation between the first joint and the second joint by driving the locking piece to extend into or out of the corresponding connected locking hole and locking groove by the drive assembly, without the need for manual operation or manual high-altitude work.

Description

Technical Field

[0001] The present invention relates to the technical field of pile foundation construction, and in particular to a power head device, a pile driver and a pile foundation construction method. Background Art

[0002] A pile driver is a machine used to construct pile foundations. It typically consists of a platform with a stand mounted on one side, upon which a power head is mounted that can be raised and lowered. The power head connects to the drill bit after it is raised, then lowers and rotates the drill bit during its descent, allowing it to drill into the ground and create a pile hole. The length of the drill bit must be selected based on the designed length of the pile foundation. Because pile foundations are typically long, the drill bit is also long. An excessively long drill bit results in an excessively long stroke for the power head. Furthermore, because the power head is typically heavy, it can easily tip over when the power head reaches its highest stroke.

[0003] To reduce the risk of pile drivers overturning, existing pile drivers are typically equipped with drilling tools that consist of multiple sections of drill rod. During pile foundation construction, the power head must first be raised. The first section of drill rod is then moved upright below the power head and connected to it. The power head is then driven down and turned on, allowing the power head to lower and rotate the first section of drill rod until it penetrates the soil. After the first section of drill rod penetrates the soil, the power head is separated from the first section and raised. The second section of drill rod is then moved upright below the power head and connected to it. The power head is then driven down again, allowing the power head to lower the second section of drill rod. When the second section of drill rod reaches the ground, its bottom end contacts the top end of the first section at the ground level. At this point, the bottom end of the second section of drill rod is connected to the top end of the first section of drill rod. The power head is then driven down and turned on again, driving the second section of drill rod to further lower and rotate the first section of drill rod until it also penetrates the soil. Repeat the above process of drilling the second section of drill rod into the soil, and then the remaining drill rods in the drilling tool can be connected in sequence and drilled into the soil in sequence, so that a pile hole that meets the design pile length requirements can be rotary excavated in the soil.

[0004] However, the existing connection method between the power head and the drill tool is usually to use a plug-in pin. Specifically, there are joints at the bottom of the power head and at the top of each drill rod. After the joint at the bottom of the power head and the top joint of the drill rod are plugged into each other, a plug-in pin is inserted between the two joints along the radial direction of the joint to prevent the power head and the drill rod from separating. However, the plug-in pin process still needs to be done manually, and because the power head and drill rod are connected after the power head is raised, the existing plug-in pin process between the power head and the drill rod is not only manually performed, but also has low connection efficiency and requires manual operation at high altitude, which also poses a high safety risk. Summary of the Invention

[0005] The purpose of the present invention is to provide a power head device, a pile driver and a pile foundation construction method to alleviate the technical problems in the prior art that the connection between the power head on the pile driver gantry and the drill rod is usually achieved by manually inserting a pin between the joint on the power head and the joint on the drill rod. Since the docking process of the power head and the drill rod is carried out after the power head is raised, the pin insertion process not only needs to be performed manually, the connection efficiency is low, and manual operation is required, which also poses a high safety risk.

[0006] In a first aspect, the present invention provides a power head device, comprising a power head, a first joint, a second joint, a drive assembly, and a locking member;

[0007] The first joint is connected to the output end of the power head, and the second joint is provided at one end of the drill pipe, and the first joint and the second joint are used to be plugged into each other; a locking hole is provided on the circumferential side wall of one of the first joint and the second joint, and a locking groove is provided on the circumferential side wall of the other joint, and the locking hole and the locking groove are used to communicate with each other when the first joint and the second joint are plugged into each other, and the locking hole is exposed;

[0008] The driving assembly is connected to the power head, and the locking member is provided at the output end of the driving assembly. The driving assembly is used to drive the locking member to move closer to or away from the first joint so that the locking member extends into or out of the corresponding connected locking hole and the locking groove.

[0009] In an optional embodiment, a positioning structure is provided between the first joint and the second joint, and the positioning structure includes a protruding portion and a recessed portion;

[0010] The protrusion is provided on the side of the circumferential side wall of the first joint facing the second joint, and the recess is provided on the side of the circumferential side wall of the second joint facing the first joint, and the protrusion on the first joint matches the recess on the second joint; and / or, the recess is provided on the side of the circumferential side wall of the first joint facing the second joint, and the protrusion is provided on the side of the circumferential side wall of the second joint facing the first joint, and the recess on the first joint matches the protrusion on the second joint.

[0011] In an optional embodiment, a side of the circumferential side wall of the first joint facing the second joint includes a smooth side wall and a positioning side wall sequentially distributed along the circumference thereof, and the positioning side wall of the first joint is provided with a protrusion and a recessed portion sequentially distributed along the circumference thereof;

[0012] The side of the circumferential side wall of the second joint facing the first joint includes a smooth side wall and a positioning side wall distributed in sequence along its circumference, and the positioning side wall of the second joint is provided with a recessed portion and a protruding portion distributed in sequence along its circumference.

[0013] In an optional embodiment, there are multiple locking holes, and the multiple locking holes are distributed at intervals along the circumference of the output end of the power head; and the multiple locking holes are distributed at intervals along the axial direction of the output end of the power head.

[0014] There are multiple locking grooves, and the positions of the multiple locking grooves correspond one-to-one to the positions of the multiple locking holes.

[0015] In an optional embodiment, the driving assembly includes a telescopic driving member, the locking member is provided at an output end of the telescopic driving member, and the telescopic driving member is used to drive the locking member to move radially toward or away from the first joint.

[0016] In an optional embodiment, the telescopic driving member is an oil cylinder, and an oil inlet is provided on the oil cylinder;

[0017] The drive assembly also includes an oil supply structure, an oil supply channel is formed inside the oil supply structure, and an oil supply port connected to the oil supply channel is provided on the oil supply structure. The oil supply structure is installed on the power head, and the oil supply port of the oil supply structure is connected to the oil inlet of the oil cylinder.

[0018] In an optional embodiment, a driving rod is provided between the output end of the power head and the first joint, one end of the driving rod is connected to the output end of the power head, and an end surface of the other end is provided with a groove, and the shaft of the driving rod where the groove is provided forms the first joint;

[0019] The end of the telescopic driving member away from the output end is connected to the outer wall of the first joint, and the oil supply structure is installed on the rod body of the driving rod and is located between the first joint and the output end of the power head.

[0020] In an optional embodiment, the oil supply structure includes a rotary tube and a rotary sleeve, the rotary tube is sleeved and fixed outside the driving rod, the rotary sleeve is sleeved outside the rotary tube and connected to the power head;

[0021] The oil supply channel is provided in the wall of the rotary tube, an oil inlet is provided on the side wall of the rotary sleeve, and an annular hole extending along the circumference of the rotary tube is provided at a position corresponding to the oil inlet to connect the oil inlet and the oil supply channel;

[0022] The end of the rotary tube away from the output end of the power head is exposed outside the rotary sleeve, and the oil supply port is arranged at the position of the rotary tube exposed outside the rotary sleeve.

[0023] In a second aspect, the present invention provides a pile driver comprising the power head device described in any one of the aforementioned embodiments.

[0024] In a third aspect, the present invention provides a pile foundation construction method, using the power head device as described in any of the above embodiments, comprising:

[0025] S1: one of the multiple drill pipe sections in the drilling tool, each of which has a second joint at its top, is placed upright below the first joint in the power head device, and then the power head is driven down to allow the first joint to be plugged into the second joint at the top of the drill pipe section;

[0026] S2: activating the drive assembly so that the locking member extends into the corresponding connected locking hole and the locking groove, then driving the power head to descend and activate the power head, so that the power head drives the drill rod below it to descend and rotate until the drill rod below the power head is rotated and pressurized into the soil;

[0027] S3: activating the drive assembly to extend the locking member out of the corresponding connected locking hole and the locking groove, then driving the power head upward to erect the next drill pipe section in the drilling tool below the first joint, and then driving the power head downward to plug the first joint into the second joint at the top end of the next drill pipe section;

[0028] S4: starting the drive assembly so that the locking member extends into the corresponding connected locking hole and the locking groove, and then driving the power head to descend, so that the power head drives the next drill rod to descend, and after the next drill rod descends to the soil surface, connecting the bottom end of the next drill rod to the second joint at the top end of the drill rod in the soil;

[0029] S5: Continue to drive the power head down and start the power head, so that the power head drives the next section of drill rod to continue to descend and rotate until the next section of drill rod is rotated and pressurized into the soil;

[0030] S6: Repeat steps S3 to S5 until multiple sections of drill rods in the drilling tool are connected in sequence and rotated and pressurized into the soil in sequence.

[0031] The power head device provided by the present invention includes a power head, a first joint, a second joint, a drive assembly and a locking piece; the first joint is connected to the output end of the power head, the second joint is provided at one end of the drill rod, and the first joint and the second joint are used to be plugged into each other; the circumferential side wall of one of the first joint and the second joint is provided with a locking hole, and the circumferential side wall of the other joint is provided with a locking groove, the locking hole and the locking groove are used to be connected to each other when the first joint and the second joint are plugged into each other, and the locking hole is exposed; the drive assembly is connected to the power head, and the locking piece is provided at the output end of the drive assembly, and the drive assembly is used to drive the locking piece to move closer to or away from the first joint so that the locking piece extends into or out of the corresponding connected locking hole and locking groove. The power head device provided by the present invention is applied to a pile driver. Specifically, the power head device is installed on a gantry on one side of the pile driver and can be raised and lowered on the gantry under the drive of a lifting drive device equipped on the gantry. The power head in the power head device is a rotary drive device, and its output end can rotate to drive the drill rod in the drill tool connected to it to rotate. Since the drill rod is usually provided with a spiral blade, the drill rod is driven by the power head to rotate and after the downward pressure is applied by the descending power head, the drill rod can be driven by the power head to rotate and drill into the soil, thereby achieving the purpose of rotary drilling of the pile hole. In the process of using the power head device provided by the present invention, the power head must first be installed on the gantry on one side of the pile driver and the first joint must be located at the bottom of the power head. Then, the power head is driven to rise so that there is enough space below the power head to accommodate the drill rod of the drill tool. Then, the drill rod provided with the second joint is grabbed, the drill rod is erected and transported to the bottom of the power head, and the second joint and the first joint are positioned relative to each other. After the second joint and the first joint are positioned relative to each other, the second joint is located on the axis of the first joint, and then the power head is driven to descend. After the power head descends, the first joint will be plugged into the second joint. After the first joint is plugged into the second joint, the locking hole and locking groove between the first joint and the second joint are connected to each other. At this time, the descending process of the power head can be stopped, and the drive assembly can be started at the same time to use the drive assembly to drive the locking member to move closer to the first joint until the locking member is inserted into the corresponding connected locking hole and locking groove. After the locking member is inserted into the locking hole and locking groove, it can act as a latch to plug and fix the first joint and the second joint, which can effectively prevent the first joint and the second joint from separating from each other along their own axis, and further prevent the drill rod from separating from the power head. At this time, the power head can be used to drive the drill rod connected to it to descend and rotate, so that the drill rod is rotated and drilled into the soil. After the drill rod is drilled into the soil, the drive assembly can be continued to be started, so that the drive assembly drives the locking member to move away from the first joint until the locking member is extended out of the corresponding connected locking hole and locking groove. At this time, the first joint and the second joint can be separated from each other along their own axis, and then the power head can be driven to rise. After the power head rises, it is separated from the drill rod.The above process of grabbing the drill rod, inserting the first and second connectors, and driving the locking member into the locking hole and locking slot can then be repeated to connect and secure the subsequent drill rod to the power head. It should be noted that after the subsequent drill rod is connected and secured to the power head, the power head must be lowered. Once the subsequent drill rod reaches the ground, it is connected to the drill rod already drilled into the soil at the ground level. The power head is then driven down again and activated, whereupon the power head rotates and pressurizes the subsequent drill rod and the drill rod below it into the soil. By repeating the above process of connecting and securing the subsequent drill rod to the power head and drilling into the soil, the multiple drill rods in the drill tool can be sequentially connected and rotated and pressurized into the soil, thereby positioning the entire drill tool within the soil and ensuring that the pile hole drilled by the drill tool meets the designed pile length requirements. It should also be noted that because the drill tool is composed of multiple drill rods, and the power head in this power head device only needs to connect to one drill rod in the drill tool during each lifting process, the lifting stroke of the power head is significantly shorter than the overall length of the drill tool, effectively reducing the risk of the pile driver overturning and ensuring construction safety. It can be seen that in the power head device provided by the present invention, although the process of inserting and fixing the first joint on the power head and the second joint on the drill pipe still needs to be performed at high altitude, the drive assembly in the power head device can replace manual labor to insert the locking member between the first and second joints, eliminating the need for manual climbing operations, effectively improving construction efficiency and reducing safety risks. Furthermore, during the process of separating the power head and the drill pipe, the drive assembly in the power head device can also replace manual labor to withdraw the locking member from between the first and second joints, similarly improving construction efficiency and reducing safety risks.

[0032] Compared with the prior art, the power head device provided by the present invention drives the locking piece to extend into or out of the corresponding connected locking hole and locking groove through the driving assembly, so as to realize the plug-in fixation or mutual separation between the first joint and the second joint. No manual operation is required, and no manual high-altitude operation is required, which can effectively improve construction efficiency and reduce safety risks.

[0033] The pile driver provided by the present invention includes the above-mentioned power head device, so the pile driver provided by the present invention and the above-mentioned power head device can achieve the same beneficial effects.

[0034] The pile foundation construction method provided by the present invention uses the above-mentioned power head device, including: S1: erecting one drill rod among the multiple drill rods with second joints at the top end in the drilling tool below the first joint in the power head device, and then driving the power head down to make the first joint plug into the second joint at the top end of the drill rod; S2: starting the driving assembly to make the locking piece extend into the corresponding connected locking hole and locking groove, and then driving the power head down and starting the power head, so that the power head drives the drill rod below it to descend and rotate until the drill rod below the power head is rotated and pressurized into the soil; S3: starting the driving assembly to make the locking piece extend out of the corresponding connected locking hole and locking groove, and then driving the power head up and inserting the next drill rod in the drilling tool into the soil. The rod is erected below the first joint, and then the power head is driven down to connect the first joint with the second joint at the top of the next drill rod; S4: Start the driving assembly to allow the locking member to extend into the corresponding connected locking hole and locking groove, and then drive the power head down, so that the power head drives the next drill rod down, and when the next drill rod descends to the surface of the soil, the bottom end of the next drill rod is connected to the second joint at the top of the drill rod in the soil; S5: Continue to drive the power head down and start the power head, so that the power head drives the next drill rod to continue to descend and rotate until the next drill rod is rotated and pressurized into the soil; S6: Repeat steps S3-S5 until the multiple drill rods in the drilling tool are connected in sequence and rotated and pressurized into the soil in sequence. The pile foundation construction method provided by the present invention uses the above-mentioned power head device, so the pile foundation construction method and the above-mentioned power head device can achieve the same beneficial effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0036] Figure 1 An exploded view of a power head device provided by an embodiment of the present invention;

[0037] Figure 2 A front view of the power head device and the drill rod provided in an embodiment of the present invention when not plugged in and connected;

[0038] Figure 3 for Figure 2 AA section view in;

[0039] Figure 4 for Figure 2 BB cross-sectional view in;

[0040] Figure 5A schematic structural diagram of a first connector provided in an embodiment of the present invention;

[0041] Figure 6 A schematic structural diagram of a second connector provided in an embodiment of the present invention;

[0042] Figure 7 A front view of the power head device and the drill rod provided in an embodiment of the present invention during the plug-in connection process;

[0043] Figure 8 for Figure 7 A cross-sectional view of the power head device and drill pipe;

[0044] Figure 9 for Figure 8 An enlarged schematic diagram of Part I in FIG.

[0045] Figure 10 for Figure 8 The CC section view in the figure;

[0046] Figure 11 A front view of the power head device and the drill rod provided in an embodiment of the present invention after being plugged in and connected;

[0047] Figure 12 for Figure 11 A cross-sectional view of the power head device and drill pipe;

[0048] Figure 13 for Figure 12 The enlarged schematic diagram of part II in FIG.

[0049] Figure 14 for Figure 12 DD cross-sectional view in;

[0050] Figure 15 A cross-sectional view of a first joint and a second joint provided in an embodiment of the present invention when the protrusion and the recess in the positioning structure do not match;

[0051] Figure 16 A cross-sectional view of the first joint and the second joint provided in an embodiment of the present invention after the protrusion and the recess in the positioning structure are matched;

[0052] Figure 17 A partial cross-sectional view of a drive rod and an oil supply structure provided in an embodiment of the present invention;

[0053] Figure 18 This is a flowchart of a pile foundation construction method provided by an embodiment of the present invention.

[0054] Icons: 1-power head; 10-drive rod; 100-first joint; 1000-locking hole; 2-drill rod; 20-second joint; 200-locking groove; 3-drive assembly; 30-telescopic drive member; 31-oil supply structure; 310-oil supply channel; 311-oil supply port; 312-rotating pipe; 3120-annular hole; 313-rotating sleeve; 3130-oil inlet; 314-oil pipe; 315-bearing; 316-sealing ring; 317-sealing plug; 318-rotating flange; 4-locking member; 50-protrusion; 51-recessed portion; 6-mounting seat; 7-support seat. DETAILED DESCRIPTION

[0055] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0056] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are intended to fall within the scope of protection of the present invention.

[0057] The following embodiments of the present invention are described in detail with reference to the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments may be combined with each other.

[0058] Example:

[0059] like Figures 1-14 As shown, the power head device provided in this embodiment includes a power head 1, a first connector 100, a second connector 20, a drive assembly 3 and a locking member 4; Figure 1 As shown, the first connector 100 is connected to the output end of the power head 1, as shown in FIG. Figure 1 and Figure 2 As shown, the second joint 20 is provided at one end of the drill rod 2. Figure 7 、 Figure 8 、 Figure 11 and Figure 12 As shown, the first connector 100 and the second connector 20 are used for plugging into each other; Figure 5 and Figure 6 As shown, the circumferential side wall of one of the first joint 100 and the second joint 20 is provided with a locking hole 1000, and the circumferential side wall of the other joint is provided with a locking groove 200, as shown in FIG. Figure 8 and Figure 9As shown, the locking hole 1000 and the locking groove 200 are used to communicate with each other when the first connector 100 and the second connector 20 are plugged in, and the locking hole 1000 is exposed; Figure 2 As shown, the drive assembly 3 is connected to the power head 1, and the locking member 4 is provided at the output end of the drive assembly 3. The drive assembly 3 is used to drive the locking member 4 to move closer to or away from the first connector 100 so that the locking member 4 extends into or out of the corresponding connected locking hole 1000 and locking groove 200.

[0060] The power head device provided in this embodiment is applied to a pile driver. Specifically, the power head device is mounted on a gantry on one side of the pile driver and can be raised and lowered on the gantry by a lifting drive device equipped on the gantry. The power head 1 in the power head device is a rotary drive device, the output end of which can rotate to drive the drill rod 2 in the drill tool connected to it. Because the drill rod 2 is typically equipped with spiral blades, the drill rod 2 is rotated by the power head 1 and, after downward pressure is applied by the descending power head 1, the drill rod 2 can be driven by the power head 1 to drill into the soil, thereby achieving the purpose of rotary drilling of the pile hole.

[0061] In the process of using the power head device provided in this embodiment, the power head 1 must first be installed on the gantry on one side of the pile driver and the first joint 100 must be located at the bottom of the power head 1. Then the power head 1 must be driven upwards so that there is enough space below the power head 1 to accommodate the drill rod 2 of the drilling tool. Then the drill rod 2 with the second joint 20 must be grabbed, and the drill rod 2 must be erected and moved to the bottom of the power head 1, while the second joint 20 and the first joint 100 are positioned opposite each other. Figure 2 shown.

[0062] After the second joint 20 and the first joint 100 are positioned relative to each other, the second joint 20 is located on the axis of the first joint 100, and then drives the power head 1 to descend. After the power head 1 descends, as shown in FIG. Figure 7 、 Figure 8 、 Figure 11 and Figure 12 As shown, the first connector 100 and the second connector 20 are plugged into each other. After the first connector 100 and the second connector 20 are plugged into each other, as shown in FIG. Figure 9 and Figure 13 As shown, the locking hole 1000 and the locking groove 200 between the first joint 100 and the second joint 20 are correspondingly connected. At this time, the descending process of the power head 1 can be stopped, and the driving component 3 is started to use the driving component 3 to drive the locking member 4 to move close to the first joint 100 until the locking member 4 is extended into the correspondingly connected locking hole 1000 and the locking groove 200. Figure 10 and Figure 14 shown.

[0063] After the locking member 4 is inserted into the locking hole 1000 and the locking groove 200, it can act as a latch to plug and fix the first joint 100 and the second joint 20, which can effectively prevent the first joint 100 and the second joint 20 from separating from each other along their own axis, and further prevent the drill rod 2 from separating from the power head 1. At this time, the power head 1 can be used to drive the drill rod 2 connected thereto to descend and rotate, so that the drill rod 2 is rotated and drilled into the soil. After the drill rod 2 is drilled into the soil, the drive assembly 3 can be further started, so that the drive assembly 3 drives the locking member 4 to move away from the first joint 100 until the locking member 4 is extended out of the corresponding connected locking hole 1000 and the locking groove 200. At this time, the first joint 100 and the second joint 20 can be separated from each other along their own axis, and then the power head 1 can be driven to rise. After the power head 1 rises, it is separated from the drill rod 2.

[0064] Afterwards, the above-mentioned process of grabbing the drill rod 2, inserting the first joint 100 and the second joint 20, and driving the locking member 4 into the locking hole 1000 and the locking groove 200 can be repeated, thereby plugging and fixing the subsequent drill rod 2 to the power head 1. It should be noted that after the subsequent drill rod 2 is plugged and fixed to the power head 1, the power head 1 needs to be driven down. After the subsequent drill rod 2 is lowered to the ground, the subsequent drill rod 2 is connected to the drill rod 2 that has been drilled into the soil at the ground, and then the power head 1 is driven down and started again, so that the power head 1 is used to rotate and pressurize the subsequent drill rod 2 and the drill rod 2 below it together into the soil.

[0065] Repeat the above process of plugging and fixing the subsequent drill rod 2 and the power head 1 and drilling into the soil, and then multiple drill rods 2 in the drilling tool can be connected in sequence and rotated and pressurized into the soil, so that the drill tool as a whole is located in the soil so that the pile hole drilled by the drill tool can meet the designed pile length requirements.

[0066] It should also be noted that since the drilling tool is divided into multiple drill rods 2, and the power head 1 in the power head device only needs to be connected to one drill rod 2 in the drilling tool during each lifting process, the lifting stroke of the power head 1 is much smaller than the overall length of the drilling tool, which can effectively reduce the risk of overturning of the pile driver and ensure construction safety.

[0067] It can be seen that in the power head device provided in this embodiment, although the process of plugging and fixing the first joint 100 on the power head 1 and the second joint 20 on the drill rod 2 still needs to be performed at high altitude, the drive assembly 3 in the power head device can replace manual labor to plug the locking member 4 between the first joint 100 and the second joint 20, eliminating the need for manual climbing operations, which can effectively improve construction efficiency and reduce safety risks. Moreover, during the process of separating the power head 1 and the drill rod 2, the drive assembly 3 in the power head device can also replace manual labor to withdraw the locking member 4 from between the first joint 100 and the second joint 20, which can also improve construction efficiency and reduce safety risks.

[0068] Compared with the prior art, the power head device provided in this embodiment drives the locking member 4 to extend into or out of the corresponding connected locking hole 1000 and locking groove 200 through the driving component 3, thereby realizing the plug-in fixation or mutual separation between the first connector 100 and the second connector 20, without the need for manual operation or manual high-altitude operation, which can effectively improve construction efficiency and reduce safety risks.

[0069] In this embodiment, if Figure 3 、 Figure 4 、 Figure 5 and Figure 6 As shown, a positioning structure is provided between the first joint 100 and the second joint 20 , and the positioning structure includes a protruding portion 50 and a recessed portion 51 .

[0070] In which, a protrusion 50 is provided on the side of the circumferential side wall of the first joint 100 facing the second joint 20, and a recess 51 is provided on the side of the circumferential side wall of the second joint 20 facing the first joint 100, and the protrusion 50 on the first joint 100 matches the recess 51 on the second joint 20; or, a recess 51 is provided on the side of the circumferential side wall of the first joint 100 facing the second joint 20, and a protrusion 50 is provided on the side of the circumferential side wall of the second joint 20 facing the first joint 100, and the recess 51 on the first joint 100 matches the protrusion 50 on the second joint 20.

[0071] Alternatively, a protrusion 50 and a recessed portion 51 are provided on the side of the circumferential side wall of the first joint 100 facing the second joint 20, and a recessed portion 51 and a protrusion 50 are provided on the side of the circumferential side wall of the second joint 20 facing the first joint 100, the protrusion 50 on the first joint 100 matches the recessed portion 51 on the second joint 20, and the recessed portion 51 on the first joint 100 matches the protrusion 50 on the second joint 20.

[0072] The protrusion 50 and the recess 51 in the positioning structure can cooperate with each other so that the locking hole 1000 and the locking groove 200 are automatically aligned and connected. Specifically, during the process of plugging the first connector 100 and the second connector 20 into each other, if the positions of the protrusion 50 and the recess 51 between the first connector 100 and the second connector 20 are misaligned, such as Figure 15 As shown, the first connector 100 and the second connector 20 cannot be plugged in smoothly due to the restriction of the protrusion 50. At this time, the power head 1 can be used to drive the first connector 100 to rotate, and at the same time drive the first connector 100 to move downward along its own axis to approach the second connector 20. During the rotation of the first connector 100, the protrusion 50 and the recessed portion 51 will also rotate relative to each other. When the protrusion 50 and the recessed portion 51 rotate relative to each other to the corresponding position, as shown in FIG. Figure 16As shown, since the power head 1 is still driving the first connector 100 to descend, the protrusion 50 can automatically move downward into the recess 51 under the drive of the power head 1, so that the first connector 100 and the second connector 20 are plugged into each other and ensure that the locking hole 1000 and the locking groove 200 between the first connector 100 and the second connector 20 after plugging are correspondingly connected.

[0073] It can be seen that the protrusion 50 and the recessed portion 51 in the positioning structure can cooperate with each other to realize automatic alignment of the first joint 100 and the second joint 20 during the process of mutual insertion of the first joint 100 and the second joint 20. Under the driving force of the descending power head 1 on the first joint 100, the automatic engagement between the locking hole 1000 and the locking groove 200 is realized, and there is no need for manual assistance to align the first joint 100 and the second joint 20, which can further improve construction efficiency.

[0074] It should be noted that in order to prevent the positioning structure from failing to achieve the alignment effect on the locking hole 1000 and the locking groove 200, the number of protrusions 50 and recesses 51 in the positioning structure can be one. If the number of protrusions 50 and recesses 51 is multiple, it is necessary to adjust the size or shape of the protrusions 50 and recesses 51 so that the shapes of the multiple protrusions 50 are different and the shapes of the multiple recesses 51 are different, thereby ensuring the alignment effect of the positioning structure on the locking hole 1000 and the locking groove 200.

[0075] In this embodiment, if Figure 3-Figure 6 As shown, the side of the circumferential side wall of the first joint 100 facing the second joint 20 includes a smooth side wall and a positioning side wall distributed in sequence along its circumference, and the positioning side wall of the first joint 100 is provided with a protrusion 50 and a recessed portion 51 distributed in sequence along its circumference; the side of the circumferential side wall of the second joint 20 facing the first joint 100 includes a smooth side wall and a positioning side wall distributed in sequence along its circumference, and the positioning side wall of the second joint 20 is provided with a recessed portion 51 and a protrusion 50 distributed in sequence along its circumference.

[0076] The smooth sidewalls are used to prevent the circumferential sidewalls of the first joint 100 and the second joint 20 from being covered with protrusions 50 and recesses 51 , making it difficult to ensure the alignment effect of the positioning structure on the locking hole 1000 and the locking groove 200 .

[0077] By providing the protrusions 50 and the recessed portions 51 distributed in sequence along the circumference of the first connector 100 and the recessed portions 51 and the protrusions 50 distributed in sequence along the circumference of the second connector 20, the structural strength of the positioning structure can be improved while ensuring the distribution balance of the positioning structure between the first connector 100 and the second connector 20, thereby improving the stability of the alignment and plugging process of the first connector 100 and the second connector 20.

[0078] In order to further improve the distribution balance of the positioning structure between the first joint 100 and the second joint 20, the first joint 100 can have two smooth side walls and two positioning side walls, and the two smooth side walls and the two positioning side walls are staggered, and the two smooth side walls are symmetrically distributed with the central axis of the first joint 100 as the symmetry axis, and the two positioning side walls are symmetrically distributed with the central axis of the first joint 100 as the symmetry axis; correspondingly, the second joint 20 also has two smooth side walls and two positioning side walls, and the two smooth side walls and the two positioning side walls are staggered, and the two smooth side walls are symmetrically distributed with the central axis of the second joint 20 as the symmetry axis, and the two positioning side walls are symmetrically distributed with the central axis of the second joint 20 as the symmetry axis.

[0079] In order to improve the use effect of the positioning structure, in this embodiment, the surface of the protrusion 50 and the surface of the recessed portion 51 are preferably arc-shaped, and the protrusion 50 and the recessed portion 51 on the positioning side wall of the first joint 100 are smoothly connected, and the protrusion 50 and the recessed portion 51 on the positioning side wall of the second joint 20 are smoothly connected.

[0080] Furthermore, the positioning side wall of the first joint 100 is provided with a plurality of protrusions 50 and a plurality of recesses 51 staggered along its circumference, and the positioning side wall of the second joint 20 is provided with a plurality of recesses 51 and a plurality of protrusions 50 staggered along its circumference.

[0081] At this time, the multiple protrusions 50 and multiple recesses 51 on the first joint 100 that are staggered along its circumference can be connected to form a wave shape, and the multiple protrusions 50 and multiple recesses 51 on the second joint 20 that are staggered along its circumference can also be connected to form a wave shape.

[0082] It should be noted that in order to ensure that the first joint 100 and the second joint 20 can be accurately docked and ensure docking stability, in this embodiment, when the drill pipe 2 is erected below the power head 1, the projection of the first joint 100 on the plane where the end face of the second joint 20 is located completely coincides with the end face shape of the second joint 20, such as Figure 16 shown.

[0083] like Figure 5 As shown, there are multiple locking holes 1000, which are spaced apart along the circumference of the output end of the power head 1, and spaced apart along the axial direction of the output end of the power head 1; as shown Figure 4 As shown, there are multiple locking grooves 200 , and the positions of the multiple locking grooves 200 correspond one-to-one to the positions of the multiple locking holes 1000 .

[0084] Corresponding to the multiple locking holes 1000 and the multiple locking grooves 200 , there can also be multiple locking members 4 , and the multiple locking members 4 are used to extend into or out of the multiple correspondingly connected locking holes 1000 and locking grooves 200 one by one.

[0085] It should be noted that the multiple locking holes 1000 are distributed at intervals along the axial direction of the output end of the power head 1, which will cause the multiple locking holes 1000 to be distributed along the circumference of any joint between the first joint 100 and the second joint 20. Therefore, when the multiple locking members 4 are correspondingly extended into the multiple corresponding connected locking holes 1000 and locking grooves 200, support points are provided along the circumference of the joint for the plug-in fixation between the first joint 100 and the second joint 20, so that the force on the first joint 100 and the second joint 20 is more balanced, and the plug-in stability between the first joint 100 and the second joint 20 is effectively improved.

[0086] In this embodiment, there are preferably two locking holes 1000, two locking grooves 200 and two locking members 4. In this case, the two locking holes 1000 are respectively provided on both sides of the first connector 100 or the second connector 20, and the locking grooves 200 are respectively provided on both sides of the second connector 20 or the first connector 100.

[0087] The multiple locking holes 1000 are distributed at intervals along the axial direction of the output end of the power head 1, which can effectively prevent the structural weak points on the first joint 100 and the second joint 20 from being too concentrated, and thus prevent the stress concentration points on the first joint 100 and the second joint 20 from being too concentrated, resulting in joint breakage.

[0088] It should also be noted that a connector structure that can be plugged into each other usually includes a male connector and a female connector. The female connector refers to a connector with a hollow interior for receiving the male connector, while the male connector is used to be inserted into the female connector. In the power head device provided in this embodiment, the first connector 100 can be either a female connector or a male connector, and correspondingly, the second connector 20 can be either a male connector or a female connector.

[0089] In this embodiment, the first connector 100 is preferably a female connector and the second connector 20 is a male connector. In this case, the locking hole 1000 is provided on the first connector 100 and the locking groove 200 is provided on the second connector 20 .

[0090] like Figure 1 、 Figure 2 、 Figure 7 and Figure 8 As shown, the driving assembly 3 includes a telescopic driving member 30 , and the locking member 4 is provided at the output end of the telescopic driving member 30 . The telescopic driving member 30 is used to drive the locking member 4 to move radially toward or away from the first joint 100 .

[0091] In practical applications, the drive assembly 3 may be a swing drive member such as a swing arm cylinder, or a telescopic drive member 30. Since the telescopic drive member 30 is more convenient to use, the drive assembly 3 preferably includes the telescopic drive member 30 in this embodiment.

[0092] It should be noted that when the first connector 100 is a female connector, in order to facilitate driving the locking member 4 through the corresponding connected locking hole 1000 and locking groove 200, the telescopic driving member 30 can be directly installed outside the first connector 100.

[0093] Furthermore, in order to improve the stability of the locking member 4 and shorten the telescopic stroke of the telescopic driving member 30 to improve the construction efficiency, when the telescopic driving member 30 is not started, the locking member 4 can be inserted into the locking hole 1000, but the locking member 4 does not extend into the locking groove 200. Figure 9 When the locking member 4 is needed to plug and fix the first connector 100 and the second connector 20, the telescopic driving member 30 is started again, so that the output end of the telescopic driving member 30 is slightly moved, and the locking member 4 enters the locking groove 200, as shown. Figure 13 As shown, the locking member 4 can thereby achieve plug-in fixation of the first connector 100 and the second connector 20 .

[0094] The telescopic drive member 30 may be a pneumatic cylinder, an electric push rod or an oil cylinder. Correspondingly, the telescopic drive member 30 may utilize compressed air, a power source or hydraulic oil as a power source to realize the telescopic process.

[0095] In this embodiment, the telescopic driving member 30 is preferably a cylinder, and an oil inlet is provided on the cylinder; Figure 1 、 Figure 2 and Figure 17 As shown, the drive assembly 3 also includes an oil supply structure 31, an oil supply channel 310 is formed inside the oil supply structure 31, and an oil supply port 311 connected to the oil supply channel 310 is provided on the oil supply structure 31. The oil supply structure 31 is installed on the power head 1, and the oil supply port 311 of the oil supply structure 31 is connected to the oil inlet of the cylinder.

[0096] Oil supply structure 31 is used to deliver hydraulic oil from an external hydraulic oil source to the oil inlet of the cylinder through oil supply channel 310 and oil supply port 311, thereby extending or contracting the cylinder. To ensure hydraulic balance within the cylinder, the cylinder is also equipped with an oil outlet. This outlet is also connected to oil supply channel 310 through a pipe, allowing the hydraulic oil to circulate between the oil supply channel 310 and the cylinder, effectively conserving resources.

[0097] Further, such as Figure 1As shown, a driving rod 10 is provided between the output end of the power head 1 and the first joint 100. One end of the driving rod 10 is connected to the output end of the power head 1, and the end face of the other end is provided with a groove. The rod body of the driving rod 10 where the groove is provided forms the first joint 100; the end of the telescopic driving member 30 away from the output end is connected to the outer wall of the first joint 100, and the oil supply structure 31 is installed on the rod body of the driving rod 10 and is located between the first joint 100 and the output end of the power head 1.

[0098] The driving rod 10 can not only improve the connection convenience between the power head 1 and the drill rod 2, but also form a first joint 100 at the bottom to the rod body near the bottom, thereby effectively ensuring the connection stability between the first joint 100 and the power head 1.

[0099] By connecting the end of the telescopic drive member 30 away from the output end to the outer wall of the first connector 100, the locking member 4 moves closer to the first connector 100 by shortening the telescopic drive member 30. In other words, the locking member 4 inserts and fixes the first connector 100 and the second connector 20 by shortening the telescopic drive member 30. Correspondingly, the locking member 4 releases the first connector 100 and the second connector 20 by extending the telescopic drive member 30.

[0100] In order to improve the smoothness of the connection between the first connector 100 and the second connector 20, Figure 1 As shown, the inner peripheral wall of the groove on the driving rod 10 can be a beveled surface, which slopes away from the central axis of the groove from the side at the bottom of the groove to the side at the groove mouth. In this case, the beveled surface can guide the second connector 20 during insertion into the first slot, making it easier for the second connector 20 to enter the first connector 100.

[0101] like Figure 17 As shown, the oil supply structure 31 includes a rotary tube 312 and a rotary sleeve 313. The rotary tube 312 is sleeved and fixed on the outside of the driving rod 10, and the rotary sleeve 313 is sleeved on the outside of the rotary tube 312 and the rotary sleeve 313 is connected to the power head 1; an oil supply channel 310 is provided in the tube wall of the rotary tube 312, and an oil inlet 3130 is provided on the side wall of the rotary sleeve 313. An annular hole 3120 extending along the circumference of the rotary tube 312 is provided at a position corresponding to the oil inlet 3130 to connect the oil inlet 3130 and the oil supply channel 310; the end of the rotary tube 312 away from the output end of the power head 1 is exposed outside the rotary sleeve 313, and the oil supply port 311 is provided at a position of the rotary tube 312 exposed outside the rotary sleeve 313.

[0102] Since the rotating tube 312 is mounted and fixed on the outside of the driving rod 10, and one end of the driving rod 10 is connected to the output end of the power head 1, when the power head 1 drives the driving rod 10 to rotate, not only can the first joint 100 on the driving rod 10 rotate, but the rotating tube 312 also rotates synchronously with the driving rod 10. However, since the rotating sleeve 313 is mounted on the outside of the rotating tube 312 and is connected to the power head 1, and only the output end of the power head 1 rotates, the rotating sleeve 313 does not rotate with the driving rod 10.

[0103] It should be noted that the annular hole 3120 extending along the circumference of the rotating tube 312 is used to ensure that the oil inlet 3130 on the rotating sleeve 313 can always be connected with the oil supply channel 310 on the rotating tube 312 when the rotating sleeve 313 is fixed and the rotating tube 312 rotates, thereby ensuring the smoothness of the oil supply process to the cylinder.

[0104] In this embodiment, the oil supply port 311 on the rotary tube 312 in the oil supply structure 31 is connected to the oil inlet of the oil cylinder via an oil pipe 314. Since the oil supply port 311 is located at a position on the rotary tube 312 that is exposed outside the rotary sleeve 313, the oil supply port 311 and the oil supply channel 310 can rotate with the rotation of the rotary tube 312. Furthermore, since the oil cylinder is located on the first joint 100, the first joint 100 also rotates under the drive rod 10. Therefore, as the oil supply port 311 and the oil supply channel 310 rotate due to the rotation of the rotary tube 312, the oil cylinder also rotates. Consequently, the oil pipe 314 between the oil supply port 311 and the oil inlet also rotates with the rotation of the drive rod 10, preventing entanglement and breakage.

[0105] It can be seen that when the oil supply structure 31 includes a rotary tube 312 and a rotary sleeve 313, it can ensure that the oil supply channel 310 can supply oil to the oil cylinder while effectively preventing the oil pipe 314 in the oil supply structure 31 from being entangled, thereby making the various components of the oil supply structure 31 more orderly and neat, and will not cause any obstruction to the use of the power head 1.

[0106] In order to improve the relative rotation smoothness between the rotating tube 312 and the rotating sleeve 313, as shown in FIG. Figure 17 As shown, a bearing 315 may be installed between the rotating tube 312 and the rotating sleeve 313 .

[0107] In this embodiment, if Figure 17 As shown, a sealing ring 316 is installed between the outer wall of the rotary tube 312 and the inner wall of the rotary sleeve 313, and sealing rings 316 are installed on both sides of the annular hole 3120. The sealing ring 316 is used to improve the sealing performance of the oil supply channel 310 to prevent hydraulic oil leakage.

[0108] Furthermore, in order to reduce the preparation process of the oil supply channel 310, a perforation can be opened on the end surface of the rotary tube 312 close to the first joint 100, and then the oil supply channel 310 is opened in the wall of the rotary tube 312 based on the perforation. At this time, in order to prevent the hydraulic oil in the oil supply channel 310 from leaking from the perforation, Figure 17 As shown, a sealing plug 317 can be installed at the through-hole.

[0109] In order to improve the convenience of communication between the oil supply channel 310 and the external hydraulic oil source and the convenience of communication between the oil supply channel 310 and the oil cylinder, as shown in FIG. Figure 17 As shown, the oil supply structure 31 of this embodiment preferably further includes an oil pipe 314 joint, and the oil inlet 3130 on the rotary sleeve 313 and the oil supply port 311 on the rotary pipe 312 can be plugged and fixed with the above-mentioned oil pipe 314 joint.

[0110] It should be noted that there is no limit to the number of oil inlets 3130 and oil supply ports 311. The number of oil inlets 3130 and oil supply ports 311 should be selected based on the number of oil cylinders. For example, if there are two locking members 4, to ensure the stability of the locking members 4, each locking member 4 can be equipped with two oil cylinders. In this case, the total number of oil cylinders is four, and the number of oil inlets 3130 and oil supply ports 311 is also four. The four oil inlets 3130 are connected to the four oil supply ports 311 in a one-to-one correspondence, and the four oil supply ports 311 are connected to the oil inlets of the four oil cylinders in a one-to-one correspondence.

[0111] like Figure 17 As shown, the oil supply structure 31 may further include a swivel flange 318, which is sleeved on the outside of the drive rod 10, and the swivel flange 318 is installed between the end of the swivel tube 312 away from the first joint 100 and the end of the swivel sleeve 313 away from the first joint 100, for improving the connection stability between the swivel tube 312 and the swivel sleeve 313.

[0112] In addition, in order to improve the connection stability and installation convenience between the rotary sleeve 313 and the power head 1, as shown in FIG. Figure 1 and Figure 17 As shown, the power head device provided in this embodiment may further include a mounting seat 6 , the mounting seat 6 is fixedly connected to the outer wall of the power head 1 , and the rotary sleeve 313 is fixedly connected to the mounting seat 6 .

[0113] Correspondingly, in order to improve the installation stability of the telescopic driving member 30 on the first joint 100, as shown in FIG. Figure 1 As shown, a support seat 7 can be fixed on the outer wall of the driving rod 10 located at the first joint 100, and the telescopic driving member 30 is installed on the support seat 7.

[0114] It should be noted that when the telescopic drive member 30 in the drive assembly 3 adopts an electric push rod, the power source for driving the telescopic drive member 30 to extend and retract can be a portable battery such as a dry cell battery or a rechargeable battery. In this case, the oil circuit related components in the above-mentioned oil supply structure 31 need to be correspondingly cancelled.

[0115] The present invention further provides a pile driver, which includes the above-mentioned power head device. Therefore, the pile driver and the above-mentioned power head device can solve the same technical problems and achieve the same technical effects, which will not be described in detail here.

[0116] The present invention also provides a pile foundation construction method, using the above-mentioned power head device, such as Figure 18 As shown, the pile foundation construction method includes:

[0117] Step S1: One of the multiple drill pipe sections 2 in the drilling tool, each of which has a second joint 20 at its top, is placed upright below the first joint 100 in the power head device, and then the power head 1 is driven downward to allow the first joint 100 to be plugged into the second joint 20 at the top of the drill pipe section 2;

[0118] Step S2: activating the drive assembly 3 so that the locking member 4 extends into the corresponding connected locking hole 1000 and locking groove 200, then driving the power head 1 to descend and activate the power head 1, so that the power head 1 drives the drill rod 2 below it to descend and rotate until the drill rod 2 below the power head 1 is rotated and pressurized into the soil;

[0119] Step S3: Activate the drive assembly 3 to extend the locking member 4 out of the corresponding connected locking hole 1000 and locking groove 200, then drive the power head 1 upward and place the next drill pipe section 2 in the drilling tool upright below the first joint 100, and then drive the power head 1 downward to connect the first joint 100 with the second joint 20 at the top end of the next drill pipe section 2;

[0120] Step S4: Start the drive assembly 3 so that the locking member 4 extends into the corresponding connected locking hole 1000 and locking groove 200, and then drive the power head 1 to descend, so that the power head 1 drives the next drill rod 2 to descend. After the next drill rod 2 descends to the soil surface, the bottom end of the next drill rod 2 is connected to the second joint 20 at the top end of the drill rod 2 in the soil;

[0121] Step S5: Continue to drive the power head 1 downward and start the power head 1, so that the power head 1 drives the next section of the drill rod 2 to continue to descend and rotate until the next section of the drill rod 2 is rotated and pressurized into the soil;

[0122] Step S6: Repeat steps S3 to S5 until the multiple sections of drill rods 2 in the drilling tool are connected in sequence and rotated and pressurized into the soil in sequence.

[0123] The pile foundation construction method provided by the present invention applies the above-mentioned power head device, so the pile foundation construction method and the above-mentioned power head device can solve the same technical problems and achieve the same technical effects, which will not be repeated here.

[0124] It should be noted that when a protrusion 50 and a recessed portion 51 are provided between the first joint 100 and the second joint 20 in the power head device, in the process of driving the power head 1 to descend in step S1 so that the first joint 100 is plugged into the second joint 20 at the top of the drill pipe section 2, the power head 1 can also be started at the same time so that the power head 1 drives the first joint 100 to rotate, thereby automatically adjusting the protrusion 50 and the recessed portion 51 from a non-engaged state to an engaged state, and finally making the locking hole 1000 and the locking groove 200 between the first joint 100 and the second joint 20 that are plugged into each other accurately aligned and connected.

[0125] In addition, it should be noted that steps S1 to S6 are used to drill the drill bit to construct the pile hole. After the pile hole construction is completed, the multiple drill rods 2 in the drill bit can be lifted up and separated in sequence according to the opposite actions of the above-mentioned drilling process, thereby realizing the withdrawal of the drill bit from the soil and the disassembly process of the drill bit.

[0126] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A power head device, characterized in that: It comprises a power head (1), a first joint (100), a second joint (20), a drive assembly (3) and a locking member (4); The first connector (100) is connected to the output end of the power head (1), and the second connector (20) is provided at one end of the drill rod (2). The first connector (100) and the second connector (20) are used for plugging into each other. A locking hole (1000) is provided on the circumferential side wall of one of the first connector (100) and the second connector (20), and a locking groove (200) is provided on the circumferential side wall of the other connector. The locking hole (1000) and the locking groove (200) are used for corresponding communication when the first connector (100) and the second connector (20) are plugged into each other, and the locking hole (1000) is exposed. The driving assembly (3) is connected to the power head (1), and the locking member (4) is provided at the output end of the driving assembly (3). The driving assembly (3) is used to drive the locking member (4) to move closer to or away from the first joint (100), so that the locking member (4) extends into or extends out of the corresponding connected locking hole (1000) and the locking groove (200); A positioning structure is provided between the first joint (100) and the second joint (20), the positioning structure comprising a protruding portion (50) and a recessed portion (51); The protrusion (50) is provided on a side of the circumferential side wall of the first joint (100) facing the second joint (20), and the recess (51) is provided on a side of the circumferential side wall of the second joint (20) facing the first joint (100), and the protrusion (50) on the first joint (100) matches the recess (51) on the second joint (20); and / or, The concave portion (51) is provided on a side of the circumferential side wall of the first joint (100) facing the second joint (20), and the convex portion (50) is provided on a side of the circumferential side wall of the second joint (20) facing the first joint (100), and the concave portion (51) on the first joint (100) matches the convex portion (50) on the second joint (20); There are a plurality of locking holes (1000), and the plurality of locking holes (1000) are distributed at intervals along the circumferential direction of the output end of the power head (1); and the plurality of locking holes (1000) are distributed at intervals along the axial direction of the output end of the power head (1); There are a plurality of locking grooves (200), and the positions of the plurality of locking grooves (200) correspond one-to-one to the positions of the plurality of locking holes (1000).

2. The power head device according to claim 1, characterized in that: The side of the circumferential side wall of the first joint (100) facing the second joint (20) comprises a smooth side wall and a positioning side wall sequentially distributed along its circumference, and the positioning side wall of the first joint (100) is provided with a protrusion (50) and a recess (51) sequentially distributed along its circumference; The side of the circumferential side wall of the second joint (20) facing the first joint (100) comprises a smooth side wall and a positioning side wall sequentially distributed along its circumference, and the positioning side wall of the second joint (20) is provided with a recessed portion (51) and a protruding portion (50) sequentially distributed along its circumference.

3. The power head device according to any one of claims 1 to 2, characterized in that: The drive assembly (3) comprises a telescopic drive member (30), the locking member (4) is provided at an output end of the telescopic drive member (30), and the telescopic drive member (30) is used to drive the locking member (4) to move toward or away from the first joint (100) along a radial direction of the first joint (100).

4. The power head device according to claim 3, characterized in that: The telescopic driving member (30) is an oil cylinder, and an oil inlet is provided on the oil cylinder; The drive assembly (3) further comprises an oil supply structure (31), an oil supply passage (310) being formed inside the oil supply structure (31), an oil supply port (311) being provided on the oil supply structure (31) and being in communication with the oil supply passage (310), the oil supply structure (31) being mounted on the power head (1), and the oil supply port (311) of the oil supply structure (31) being in communication with the oil inlet of the oil cylinder.

5. The power head device according to claim 4, characterized in that: A driving rod (10) is provided between the output end of the power head (1) and the first joint (100); one end of the driving rod (10) is connected to the output end of the power head (1), and the end surface of the other end is provided with a groove; the rod body of the driving rod (10) at the location provided with the groove forms the first joint (100); The end of the telescopic driving member (30) away from the output end is connected to the outer wall of the first joint (100), and the oil supply structure (31) is installed on the rod body of the driving rod (10) and is located between the first joint (100) and the output end of the power head (1).

6. The power head device according to claim 5, characterized in that: The oil supply structure (31) comprises a rotary tube (312) and a rotary sleeve (313), wherein the rotary tube (312) is sleeved and fixed outside the driving rod (10), and the rotary sleeve (313) is sleeved outside the rotary tube (312) and connected to the power head (1); The oil supply channel (310) is provided in the wall of the rotary tube (312), an oil inlet (3130) is provided on the side wall of the rotary sleeve (313), and an annular hole (3120) extending along the circumference of the rotary tube (312) is provided at a position of the rotary tube (312) corresponding to the oil inlet (3130) to connect the oil inlet (3130) and the oil supply channel (310); The end of the rotary tube (312) away from the output end of the power head (1) is exposed outside the rotary sleeve (313), and the oil supply port (311) is provided at a position of the rotary tube (312) exposed outside the rotary sleeve (313).

7. A pile driver, characterized in that: The invention comprises the power head device according to any one of claims 1 to 6.

8. A pile foundation construction method, using the power head device according to any one of claims 1 to 6, characterized in that: include: S1: one of the multiple drill rod sections (2) in the drilling tool, each of which has a second joint (20) at its top end, is erected below the first joint (100) in the power head device, and then the power head (1) is driven downward to connect the first joint (100) with the second joint (20) at the top end of the drill rod section (2); S2: starting the driving assembly (3) so that the locking member (4) extends into the corresponding connected locking hole (1000) and the locking groove (200), then driving the power head (1) to descend and starting the power head (1), so that the power head (1) drives the drill rod (2) below it to descend and rotate until the drill rod (2) below the power head (1) is rotated and pressurized into the soil; S3: starting the driving assembly (3) so that the locking member (4) extends out of the corresponding connected locking hole (1000) and the locking groove (200), then driving the power head (1) to rise and erect the next drill rod (2) in the drilling tool below the first joint (100), and then driving the power head (1) to descend so that the first joint (100) is plugged into the second joint (20) at the top end of the next drill rod (2); S4: starting the driving assembly (3) so that the locking member (4) extends into the corresponding connected locking hole (1000) and the locking groove (200), and then driving the power head (1) to descend, so that the power head (1) drives the next section of the drill rod (2) to descend, and after the next section of the drill rod (2) descends to the soil surface, the bottom end of the next section of the drill rod (2) is connected to the second joint (20) at the top end of the drill rod (2) in the soil; S5: Continue to drive the power head (1) downward and start the power head (1), so that the power head (1) drives the next section of the drill rod (2) to continue to descend and rotate until the next section of the drill rod (2) is rotated and pressurized into the soil; S6: Repeat steps S3 to S5 until the multiple sections of drill rods (2) in the drilling tool are connected in sequence and rotated and pressurized into the soil in sequence.

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