Rotary drilling rigs and their construction methods

Abstract

This application provides a rotary drilling rig and its construction method, relating to the field of engineering machinery construction technology. The rig includes a main unit, a mast, a gooseneck, a main winch, a power head slide, a pilot hole assembly, and a hydraulic hammer assembly. The mast is mounted on the main unit; the gooseneck is mounted at the top of the mast, and the gooseneck has a first pulley group and a second pulley group, the distance from the second pulley group to the mast being less than the distance from the first pulley group to the mast; the main winch is mounted on the main unit, and its traction rope is selectively wound around either the first or second pulley group; the power head slide is slidably mounted on the mast; the pilot hole assembly is detachably mounted on the power head slide to perform pilot hole operations in the target area to form a pilot hole; the hydraulic hammer assembly, with its traction rope wound around the second pulley group, is connected to the traction rope and, driven by the main unit, aligns with a precast pile placed above the pilot hole and hammers the precast pile downwards.

Description

Technical Field

[0001] At least one embodiment of this application relates to the field of construction machinery technology, and more specifically, to a rotary drilling rig and its construction method. Background Technology

[0002] Rotary drilling rigs are large-scale engineering machines used in building foundation engineering, primarily for pile foundation drilling. They are also the most widely used drilling equipment in pile foundation construction. The conventional operating mode involves mounting a rotary telescopic drill rod and drill bit, using a power head to drive the drill rod to rotate and press down, repeatedly removing soil to complete the hole. They also possess strong adaptability, allowing for various construction processes such as long spiral grouting, screw piles, and mixing piles by changing the front-end working device. The equipment has a wide range of applications.

[0003] With the increasing diversity of engineering construction needs, the scenario of rotary drilling rigs being used to replace their front-end working devices with hydraulic hammers is becoming more and more common. In construction in hard strata, to ensure construction quality and reduce operational difficulty, a combined construction method of first drilling and then hammering is usually adopted. That is, the strata are first cleared by drilling with a rig, and then the pile body is driven in using a hydraulic hammer. However, this combined construction method has obvious drawbacks: if two independent machines are used to complete the drilling and hydraulic hammer construction respectively, the equipment purchase and rental costs are high, the site occupation is large, and the efficiency of site relocation and coordination is low; if the same main unit is used to replace the working device, although the equipment investment can be reduced, the switching between the drilling and hydraulic hammer devices requires the disassembly and assembly of core components, the operation process is cumbersome, and the overall construction efficiency is low. Summary of the Invention

[0004] In view of this, this application provides a rotary drilling rig that is equipped with two sets of working devices: a pilot hole and a hydraulic hammer. It has the function of combined pilot hole and hammering construction, which improves practicality and work efficiency and reduces equipment cost.

[0005] As one aspect of this application, a rotary drilling rig is provided, including a main unit, a mast, a gooseneck, a main winch, a power head slide, a pilot hole assembly, and a hydraulic hammer assembly. The mast is mounted on the main unit; the gooseneck is mounted at the top of the mast, and the gooseneck has a first pulley group and a second pulley group, the distance from the second pulley group to the mast being less than the distance from the first pulley group to the mast; the main winch is mounted on the main unit, and the traction rope of the main winch is selectively wound around either the first pulley group or the second pulley group; the power head slide is slidably mounted on the mast; the pilot hole assembly is detachably mounted on the power head slide to perform pilot hole operations in a target area to form a pilot hole; the hydraulic hammer assembly, with the traction rope wound around the second pulley group, is connected to the traction rope and, driven by the main unit, aligns with a precast pile placed above the pilot hole and hammers the precast pile downwards.

[0006] According to an embodiment of this application, the host machine includes a vehicle body and a chassis. The vehicle body is configured to rotate relative to the chassis about a rotation axis; in the orthographic projection along the height direction, the projection center of the pilot drill of the pilot hole assembly and the projection center of the hammer body of the hydraulic hammer assembly are respectively located at different positions on a circle centered on the projection of the rotation axis of the host machine, so as to drive the vehicle body to rotate and align the pilot drill or the hydraulic hammer assembly with the target area.

[0007] According to an embodiment of this application, in the orthographic projection along the height direction, the projection center of the pilot hole drill of the pilot hole assembly and the projection center of the hammer body of the hydraulic hammer assembly are spaced apart in the traveling direction parallel to the host machine, so as to drive the host machine to move so that the pilot hole drill or the hydraulic hammer assembly is aligned with the target area.

[0008] According to an embodiment of this application, the goose head includes a third pulley block and a supporting frame. The third pulley block is suitable for guiding the traction rope to be wound around the first pulley block or the second pulley block;

[0009] The supporting frame includes a first arm and a second arm. The first arm is connected to the mast, and the third pulley block is disposed at the first end of the first arm; the second arm extends obliquely upward from the second end of the first arm, and the first pulley block and the second pulley block are disposed at intervals in the second arm.

[0010] According to an embodiment of this application, a rotary drilling assembly is also included, which is detachably mounted on the power head slide and is adapted to be connected to the traction rope to perform rotary drilling operations when the traction rope is wound around the first pulley block.

[0011] According to an embodiment of this application, the goose head also includes a lifting device. The lifting device, with the traction rope wound around the first pulley block, is connected between the traction rope and the rotary drilling assembly, and is adapted to allow the rotary drilling assembly to rotate relative to the traction rope during operation.

[0012] According to an embodiment of this application, the aforementioned power head carriage includes a main body and a mounting portion. The main body is slidably disposed on the mast; the mounting portion is disposed on the side of the main body opposite to the mast and is suitable for mounting the pilot hole power head of the pilot hole assembly, or mounting the rotary drilling assembly.

[0013] As another aspect of the embodiments of this application, a construction method including any of the above-mentioned rotary drilling rigs is provided, comprising:

[0014] The above-mentioned hole-setting assembly is driven to perform hole-setting operation on the target area, so that the target area is formed with holes;

[0015] Place the precast pile above the aforementioned pilot hole, and make the axis of the precast pile approximately coincide with the axis of the aforementioned pilot hole.

[0016] Drive the main unit to move the hydraulic hammer assembly above the precast pile;

[0017] The hydraulic hammer assembly is driven to hammer the precast pile downwards, causing the precast pile to sink downwards along the pilot hole.

[0018] According to an embodiment of this application, driving the host computer to move the hydraulic hammer assembly above the precast pile includes:

[0019] The host machine is driven to rotate or translate, causing the borehole assembly to move away from the target area and the hydraulic hammer assembly to move above the precast pile.

[0020] According to an embodiment of this application, when the precast pile is hammered downwards by the hydraulic hammer assembly and a pile bottom plug is formed at the bottom of the precast pile, the method further includes: driving the main unit to align the pilot hole assembly with the precast pile, causing the pilot hole assembly to pass through the precast pile and form a pilot hole; driving the main unit to align the hydraulic hammer assembly with the precast pile, causing the precast pile to continue sinking downwards along the pilot hole.

[0021] The rotary drilling rig provided in this application integrates both pilot hole drilling and hydraulic hammer pile driving functions into a single unit, enabling continuous integrated pilot hole drilling and hammer driving operations. This eliminates the need for repeated disassembly and reassembly of core components such as the power head, drill rod, and gooseneck, thus shortening process changeover time. It also eliminates the need for purchasing, leasing, transporting, and manpower for two separate pilot hole drilling rigs and hydraulic hammers, reducing equipment investment and site occupation. Furthermore, it is adaptable to complex geological formations such as hard rock and dense gravel, where conventional pile driving techniques are difficult. The equipment has a wider range of applicable geological formations and working conditions, meeting the needs of multi-process construction and improving the overall operational efficiency of the equipment. Attached Figure Description

[0022] The above and other objects, features and advantages of this application will become clearer from the following description of embodiments with reference to the accompanying drawings, in which:

[0023] Figure 1 The illustration schematically shows a side view of a rotary drilling rig according to an embodiment of the present application from a first perspective;

[0024] Figure 2 The illustration schematically shows a side view of a rotary drilling rig according to an embodiment of the present application from a second perspective;

[0025] Figure 3 A schematic side view of a pilot hole power head according to an embodiment of the present disclosure is shown;

[0026] Figure 4 Schematic illustration as follows Figure 3 The top view of the pilot hole power head shown;

[0027] Figure 5 Schematic illustration of, for example Figure 3 The shown is a side view of the pilot hole power head mounted on the power head carriage;

[0028] Figure 6 The illustration shows a side view of a rotary drilling rig in rotary drilling operation mode according to an embodiment of this application;

[0029] Figure 7 A schematic side view of the power head carriage and rotary drilling assembly according to an embodiment of this application is shown;

[0030] Figure 8 Schematic illustration Figure 2 A magnified view of part A shown;

[0031] Figure 9 The schematic illustration shows a side view of the power head carriage according to an embodiment of the present disclosure from a first perspective;

[0032] Figure 10 Schematic illustration Figure 9 The power head carriage shown is a side view from a second perspective;

[0033] Figure 11 Schematic illustration Figure 9 The top view of the power head carriage shown;

[0034] Figure 12 The schematic diagram illustrates a centrally aligned schematic of a hydraulic hammer and a long spiral according to an embodiment of this application;

[0035] Figure 13 The schematic diagram illustrates another hydraulic hammer centered with a long spiral according to an embodiment of this application;

[0036] Figure 14 A flowchart illustrating a rotary drilling rig construction method according to an embodiment of this application is shown schematically.

[0037] Figures 15(a)-15(c) schematically illustrate the state change flowcharts of a rotary drilling rig construction method according to an embodiment of this application.

[0038] Figure 16 The diagram illustrates a construction method using a rotary drilling rig according to an embodiment of this application in the case of pile bottom bridging.

[0039] Figures 17(a)-17(c) schematically illustrate the process flow of switching between two construction modes of a rotary drilling rig according to an embodiment of the present application.

[0040] In the accompanying drawings, the meanings of the reference numerals are as follows:

[0041] 1. Host computer;

[0042] 11. Vehicle body;

[0043] 12. Chassis;

[0044] 2. Mast;

[0045] 3. Goose head;

[0046] 31. First pulley system;

[0047] 32. Second pulley system;

[0048] 33. The third pulley system;

[0049] 34. Load-bearing frame;

[0050] 341. First Arm;

[0051] 342. Second arm;

[0052] 35. Lifting device;

[0053] 4. Main winch;

[0054] 41. Towing rope;

[0055] 5. Power head carriage;

[0056] 51. Main body;

[0057] 52. Installation Department;

[0058] 6. Pipe assembly;

[0059] 61. Pilot hole power head;

[0060] 62. Pre-hole drilling tools;

[0061] 63. Mounting base;

[0062] 7. Hydraulic hammer assembly;

[0063] 71. Hammer body;

[0064] 72. Hydraulic hammer slide;

[0065] 8. Rotary drilling assembly;

[0066] 81. Rotary drilling power head;

[0067] 82. Rotary drill bit;

[0068] 83. Telescopic drill rod;

[0069] 9. Precast piles. Detailed Implementation

[0070] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with specific embodiments and the accompanying drawings.

[0071] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of this application. The terms “comprising,” “including,” etc., as used herein indicate the presence of the stated features, steps, operations, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, or components.

[0072] All terms used herein, including technical and scientific terms, have the meanings commonly understood by those skilled in the art, unless otherwise defined. It should be noted that the terms used herein are to be interpreted in a manner consistent with the context of this specification, and not in an idealized or overly rigid way.

[0073] When using expressions such as "at least one of A, B, and C," the meaning should generally be interpreted according to the understanding of someone skilled in the art. For example, "a system having at least one of A, B, and C" should include, but is not limited to, systems having A alone, having B alone, having C alone, having A and B, having A and C, having B and C, and / or having A, B, and C. Similarly, when using expressions such as "at least one of A, B, or C," the meaning should generally be interpreted according to the understanding of someone skilled in the art. For example, "a system having at least one of A, B, or C" should include, but is not limited to, systems having A alone, having B alone, having C alone, having A and B, having A and C, having B and C, and / or having A, B, and C.

[0074] It should also be noted that the directional terms mentioned in the embodiments, such as "up," "down," "front," "back," "left," and "right," are only for reference to the directions in the accompanying drawings and are not intended to limit the scope of protection of this application. Throughout the drawings, the same elements are represented by the same or similar reference numerals. Conventional structures or constructions will be omitted where they may cause confusion in understanding this application.

[0075] In related technologies, rotary drilling rigs typically utilize the rotary drilling assembly to rotate and press down to drill holes. In actual construction, the power head carriage drives the rotary drilling power head to move horizontally along the mast, causing the rotary drilling power head to press down and drill, repeatedly removing soil or rock cores to achieve hole formation.

[0076] Rotary drilling rigs rapidly excavate and extract soft strata such as soil and silt by rotating a drill bit. However, when encountering high-strength hard rock (such as moderately weathered granite with a compressive strength exceeding 100 MPa), cutting efficiency drops drastically, leading to drilling difficulties, severe drill bit wear, and even complete failure to advance. Therefore, in cases of hard strata, a method of pre-drilling followed by pile driving is employed.

[0077] One approach in related technologies involves a split operation: one machine performs pre-drilling, while another uses a hydraulic hammer to drive the pile. This method requires two main units, doubling the cost of equipment procurement or leasing. It also necessitates two separate teams for transportation, fuel, operations, and support, increasing labor, logistics, and management costs. Furthermore, this method requires removing the rotary drilling rig after pre-drilling and repositioning the hydraulic hammer pile driver. This involves equipment removal, repositioning, and leveling, resulting in lengthy process changes and difficulties in seamlessly coordinating subsequent steps. This can lead to idle time, extended overall project timelines, and other drawbacks.

[0078] Another approach is to use the same equipment and change the front-end working device to perform the pre-drilling and then pile driving operation. However, changing the front-end working device is not a simple disassembly and assembly operation. It usually requires lowering the mast, removing the rotary drill bit or hydraulic hammer from the main unit, and then reinstalling another device. In complex strata (such as alternating hard and soft strata) where frequent alternation of pre-drilling and hammering functions is required, this repeated changing will severely disrupt the continuity of construction and lead to a significant decrease in overall efficiency.

[0079] Figure 1 The illustration schematically shows a side view of a rotary drilling rig according to an embodiment of this application from a first perspective. Figure 2 The illustration shows a side view of a rotary drilling rig according to an embodiment of the present application from a second perspective.

[0080] Embodiments of this application provide a rotary drilling rig, such as Figure 1 and Figure 2As shown, the rotary drilling rig includes a main unit 1, a mast 2, a gooseneck 3, a main winch 4, a power head slide 5, a pilot hole assembly 6, and a hydraulic hammer assembly 7. The mast 2 is mounted on the main unit 1. The gooseneck 3 is located at the top of the mast 2 and has a first pulley block 31 and a second pulley block 32. The distance from the second pulley block 32 to the mast 2 is less than the distance from the first pulley block 31 to the mast 2. The main winch 4 is mounted on the main unit 1. The traction rope 41 of the main winch 4 is selectively wound around either the first pulley block 31 or the second pulley block 32. The power head slide 5 is slidably mounted on the mast 2. The pilot hole assembly 6 is detachably mounted on the power head slide 5 to perform pilot hole operations in the target area to form a pilot hole. With the traction rope 41 wound around the second pulley block 32, the hydraulic hammer assembly 7 is connected to the traction rope 41 and, driven by the main unit 1, is aligned with the precast pile 9 placed above the pilot hole, and hammers the precast pile 9 downward.

[0081] In complex geological conditions such as high ground hardness or dense pebbles and rock layers, the traction rope 41 can be wound around the second pulley block 32, the hydraulic hammer assembly 7 can be installed on the mast 2, and the pilot hole assembly 6 can be installed on the power head slide 5, so that the pilot hole assembly 6 and the hydraulic hammer assembly 7 can be installed on the same main machine mast 2 for hammering pile driving operation.

[0082] As an example, the pilot hole assembly 6 can be aligned with the target area to be constructed under the drive of the main unit 1, forming a pilot hole in the target area. After the pilot hole is formed, the precast pile 9 is placed above the pilot hole, and the central axis of the precast pile 9 is roughly aligned with the central axis of the pilot hole. The main winch 4 drives the traction rope 41 to cause the hydraulic hammer assembly 7 to impact downwards, impacting the precast pile 9 to the target depth.

[0083] In this embodiment, the pilot hole assembly 6 and the hydraulic hammer assembly 7 can work alternately or in coordination along the mast 2, completing the integrated construction of pilot hole and hammering without replacing the main unit. This avoids the problem that the rotary drill bit 82 of the rotary drilling assembly 8 cannot drill into extremely hard strata or is severely deviated from the hole. At the same time, it saves the equipment replacement time of separately calling the pilot hole assembly 6 or the hydraulic hammer assembly 7, improves the construction efficiency and hole quality under complex geological conditions, and realizes the multi-functionality of the main unit.

[0084] In one exemplary embodiment, the host unit 1, serving as the mounting base and power source for the entire device, may include a chassis 12 and a vehicle body 11. The vehicle body 11 is configured to rotate about a rotation axis relative to the chassis 12.

[0085] The chassis 12 may include a frame and a running gear. The body 11 is rotatably mounted on the frame. The running gear is disposed below the frame and is used to drive the frame to move. The running gear may include a track assembly or drive wheels, etc.

[0086] The vehicle body 11 can be mounted on the frame via a slewing bearing, allowing the vehicle body 11 to rotate freely 360° relative to the chassis 12 around the slewing bearing. The vehicle body 11 can integrate core components such as the engine, cab, hydraulic system, control system, and main winch and auxiliary winch.

[0087] The axis of rotation is the central axis of the slewing bearing, and the direction of extension of the axis of rotation is approximately parallel to the vertical direction.

[0088] The mast 2 is installed on the main unit 1 as a column-type load-bearing guide structure, and integrates a pressure cylinder and guide rail inside.

[0089] Both the angle and height of mast 2 are adjustable to adapt to different working conditions. For example, through the coordinated action of the luffing mechanism and the mast cylinder, mast 2 can be raised, lowered, and finely adjusted forward, backward, left, and right (e.g., from the operator's perspective, it can tilt left and right ±5°, tilt forward 5°, and tilt backward 15°). When working in height-restricted areas (such as under bridges or inside factories), a telescopic mast can be used, and the length of mast 2 can be changed through the built-in cylinder to meet the construction requirements of different spatial heights.

[0090] As an example, the traction rope 41 may include a steel wire rope or a synthetic fiber rope, etc.

[0091] As an example, precast pile 9 is a type of pile that is prefabricated in a factory or on the construction site, then transported to the pile location and driven into the ground using piling equipment (such as a hydraulic hammer, pile driver, etc.) to serve as the foundation of a building or structure. Precast pile 9 can include precast concrete piles or precast steel piles.

[0092] According to embodiments of this disclosure, such as Figure 1 and Figure 2 As shown, the hydraulic hammer assembly 7 may include a hammer body 71 and a hydraulic hammer slide 72. With the traction rope 41 wound around the second pulley block 32, the top of the hydraulic hammer assembly 7 is connected to the traction rope 41, and the hydraulic hammer slide 72 slidably mounts the hammer body 71 to the mast 2. The hydraulic hammer slide 72, in cooperation with the guide rail of the mast 2, provides precise vertical guidance for the hammer body 71, ensuring that the hammering force is transmitted along the centerline of the precast pile 9, avoiding pile tilting or breakage caused by eccentric impact, and ensuring the verticality and quality of pile driving. The hydraulic hammer slide 72 bears the lateral vibration and reaction force generated during hammering, allowing the lateral force to be directly transmitted to the mast 2, while the traction rope 41 only bears the vertical lifting force, avoiding premature fatigue damage to the traction rope 41 due to lateral force. In addition, the guidance of the hydraulic hammer slide 72 and the mast 2 ensures that the hammer body 71 can reciprocate stably along a fixed trajectory during multiple consecutive impacts, effectively reducing swaying and improving work efficiency and safety.

[0093] As an example, such as Figure 1 and Figure 2As shown, there can be multiple hydraulic hammer slides 72, which are arranged at intervals along the axial direction of the hydraulic hammer.

[0094] Figure 3 A schematic side view of a borehole power head according to an embodiment of the present disclosure is shown. Figure 4 Schematic illustration as follows Figure 3 The top view of the pilot hole power head shown is shown. Figure 5 Schematic illustration of, for example Figure 3 The shown is a side view of the pilot hole power head mounted on the power head carriage.

[0095] According to embodiments of this disclosure, such as Figures 1 to 5 As shown, the pilot hole assembly 6 includes a pilot hole power head 61 and a pilot hole drill 62. The pilot hole power head 61 is used to drive the pilot hole drill 62 to rotate.

[0096] The pilot hole drill 62 may include a long auger drill rod or a stirring drill rod.

[0097] The pilot hole drill 62 is installed on the side of the pilot hole power head 61 that extends along the height direction and is adjacent to the power head slide 5. In the orthographic projection along the height direction, the projection of the pilot hole drill 62 is misaligned with the projection of the hammer body 71 of the hydraulic hammer assembly 7. This can avoid interference between the hammer body 71 and the pilot hole drill 62.

[0098] During the pilot hole operation, the pilot hole assembly 6 is raised and lowered by the power head slide 5, and the pilot hole drill 62 rotates under the drive of the pilot hole power head 61 to drill into the stratum and form a pilot hole of preset depth and diameter in the target area, providing a guide channel for the subsequent driving of precast piles 9.

[0099] Figure 6 This schematically illustrates a side view of a rotary drilling rig according to an embodiment of the present application in rotary drilling operation mode. Figure 7 A schematic side view of a power head carriage and rotary drilling assembly according to an embodiment of this application is shown.

[0100] In some illustrative embodiments, such as Figure 6 and Figure 7 As shown, the rotary drilling rig also includes a rotary drilling assembly 8. The rotary drilling assembly 8 is detachably mounted on the power head slide 5 and is suitable for use when the traction rope 41 is wound around the first pulley block 31, connected to the traction rope 41 for rotary drilling operations. Thus, when the geological conditions are suitable (e.g., soil, sand, strongly weathered rock, etc.), the traction rope 41 can be wound around the first pulley block 31, and the rotary drilling assembly 8 can be mounted on the power head slide 5, allowing the traction rope 41 to provide lifting and lowering power for the rotary drilling assembly 8, enabling the rotary drilling rig to perform rotary drilling operations.

[0101] like Figure 7As shown, the rotary drilling assembly 8 includes a rotary power head 81, a rotary drill bit 82, and a telescopic drill rod 83. The rotary power head 81 can integrate a hydraulic motor and a reduction mechanism, providing rotational torque and axial pressure to the rotary drill bit 82. The telescopic drill rod 83 extends and retracts section by section to adapt to different drilling depths, transmitting the power generated by the rotary power head 81 to the rotary drill bit 82. The rotary drill bit 82 directly contacts the rock and soil, and is equipped with cutting teeth or bucket teeth at the bottom. It rotates to cut and grab the broken soil and rock into the bucket. After the drill is lifted, the bottom door is opened to unload the slag, completing the soil extraction and hole formation. The rotary drilling assembly 8 is mounted on the mast 2 and moves up and down along the guide rail of the mast 2 by means of the power head slide 5, thereby ensuring the verticality and stability of the drilling direction.

[0102] Figure 8 Schematic illustration Figure 2 A magnified view of part A shown.

[0103] like Figure 8 As shown, the goose head 3 can be a support component installed at the top of the mast 2, with a first pulley group 31 and a second pulley group 32 arranged at intervals. The second pulley group 32 is set closer to the mast 2 than the first pulley group 31, so that the first pulley group 31 and the second pulley group 32 can be at different distances from the mast 2. This can adapt to the routing requirements of the traction rope 41 for rotary drilling operations and hammer pile driving operations respectively.

[0104] According to embodiments of this disclosure, such as Figure 5 As shown, the goose head 3 also includes a third pulley block 33 and a supporting frame 34. The third pulley block 33 is used to guide the traction rope 41 wound around the first pulley block 31 or the second pulley block 32. The supporting frame 34 includes a first arm 341 and a second arm 342. The first arm 341 is connected to the mast 2, and the third pulley block 33 is disposed at the first end of the first arm 341. The second arm 342 extends obliquely upward from the second end of the first arm 341, and the first pulley block 31 and the second pulley block 32 are disposed at intervals on the second arm 342.

[0105] The third pulley block 33 guides the traction rope 41 of the main winch 4 to the first pulley block 31 or the second pulley block 32, ensuring that the traction rope 41 has a suitable wrap angle and direction with each pulley block, so that the wire rope is evenly stressed and wear is reduced, and the traction rope 41 can be quickly and safely switched between rotary drilling and hammer pile driving.

[0106] The first pulley block 31 and the second pulley block 32 are spaced apart along the extension direction of the second arm 342. The second pulley block 32 is located inside the first pulley block 31, such that the distance from the first pulley block 31 to the mast 2 is greater than the distance from the second pulley block to the mast 2. This allows the first pulley block 31 and the second pulley block 32 to respectively correspond to the routing requirements of the traction rope 41 in different operating modes (i.e., rotary drilling or hammer pile driving), ensuring that the traction rope 41 is subjected to balanced force, accurate positioning, and no positional conflict in each operating mode. In addition, it allows the traction rope 41 to disengage from the second pulley block 32 when it is wrapped around the first pulley block 31, ensuring that the traction rope 41 only contacts the currently selected pulley block during operation, while there is sufficient clearance between it and the pulley blocks in the non-operating state. This avoids unnecessary friction or interference between the traction rope 41 and the idle pulley blocks during movement, reducing wear on the traction rope 41 and preventing additional resistance and noise caused by accidental contact, thus ensuring the singularity, stability, and efficiency of traction force transmission.

[0107] According to embodiments of this disclosure, such as Figure 5 As shown, the goose head 3 also includes a lifting device 35. With the traction rope 41 wound around the first pulley block 31, the lifting device 35 is connected between the traction rope 41 and the rotary drilling assembly 8, which allows the rotary drilling assembly 8 to rotate relative to the traction rope 41 during operation.

[0108] The upper end of the lifting device 35 is connected to the traction rope 41, and the lower end is connected to the rotary drilling assembly 8. The lifting device 35 has internal rotating bearings and other adapting structures, allowing for relative free rotation of the upper and lower parts of the lifting device 35. This enables the rotary drilling assembly 8 to rotate freely synchronously with the drill rod during rotary drilling operations, preventing the traction rope 41 from becoming entangled and damaged due to twisting with the rotary drilling assembly 8. This ensures the connection stability of the traction rope 41, enabling control of the lifting and lowering actions of the rotary drilling assembly 8 without interfering with the rotational operation during rotary drilling, thus guaranteeing continuous and smooth rotary drilling operations.

[0109] Figure 9 The schematic illustration shows a side view of the power head carriage according to an embodiment of the present disclosure from a first perspective. Figure 10 Schematic illustration Figure 9 The shown is a side view of the power head carriage from a second-person perspective. Figure 11 Schematic illustration Figure 9 The top view of the power head carriage shown.

[0110] According to embodiments of this disclosure, such as Figures 10 to 12As shown, the power head carriage 5 includes a main body 51 and a mounting part 52. The main body 51 is slidably disposed on the mast 2. The mounting part 52 is disposed on the side of the main body opposite to the mast 2, and is suitable for mounting the pilot hole power head 61 of the pilot hole assembly 6, or mounting the rotary drilling assembly 8.

[0111] As an example, the main body 51 can be constructed as a roughly rectangular parallelepiped structure.

[0112] The general idea is that the main body 51 visually resembles a cuboid, but does not conform to the strict geometric definition of a cuboid. For example, the two opposite sides of the main body 51 can be hollowed out to reduce the weight of the main body 51; the apex of the main body 51 is rounded to distribute stress and make it more aesthetically pleasing, etc.

[0113] The mounting part 52 protrudes outward from the main body 51. The side of the power head slide 5 opposite to the mounting part 52 is slidably mounted on the mast 2 for mounting the pilot hole power head 61 and the rotary drilling assembly 8 to move up and down along the mast 2 to complete the pilot hole operation or rotary drilling operation.

[0114] The main body 51 and the mast 2 can adopt a guide rail slider structure, guide groove structure or other commonly used sliding fit form to realize the feeding and retraction of the construction operation position.

[0115] The mounting section 52 is located on the side of the main body 51 away from the mast 2, providing an installation reference and connection structure for the operation execution components. Common connection methods such as bolt connection, welding, pin connection or integral casting can be used between the main body 51 and the mounting section 52.

[0116] According to an embodiment of this disclosure, the pilot hole assembly 6 further includes a mounting base 63. The pilot hole power head 61 is mounted on the mounting base 63, which has a connection structure that mates with the mounting portion 52.

[0117] The mounting base 63 or the rotary drilling assembly 8 can be detachably connected to the mounting part 52 using bolts, flanges, pins, or other connection methods.

[0118] For example, the mounting part 52 has a corresponding mounting hole, and the mounting seat 63 of the pilot hole power head 61 or the support seat of the rotary drilling power head 81 has a connecting hole that matches the mounting hole. The mounting seat 63 of the pilot hole power head 61 or the support seat of the rotary drilling power head 81 can be installed on the mounting part 52 by passing a bolt through the mounting hole and the connecting hole, so as to achieve a detachable fixed connection.

[0119] In actual operation, the pilot hole power head 61 of the pilot hole assembly 6 or the rotary drilling power head 81 of the rotary drilling assembly 8 can be selectively installed on the installation part 52 according to the working conditions. Through this structural setting, the same power head carriage 5 can be adapted to different operation execution components, meet diverse construction needs, and improve the versatility of the equipment.

[0120] In this embodiment, the hammer 71 can be arranged on the side of the mast 2 with guide rails via the hydraulic hammer slide 72 and the traction rope 41. The pilot hole power head 61 is mounted on the power head slide 5, and the pilot hole drill 62 is mounted on the side of the mounting base 63 that extends along the height direction and is adjacent to the power head slide 5. This ensures that the projection of the pilot hole drill 62 and the projection of the hammer 71 are misaligned in the orthographic projection along the height direction, avoiding overlap and interference between the vertical displacement of the pilot hole assembly 6 and the hydraulic hammer assembly 7 during operation, and ensuring that the two sets of devices can work independently without interfering with each other.

[0121] In some illustrative embodiments, such as Figure 5 , Figure 7 As shown, the rotary drilling power head 81 of the rotary drilling assembly 8 can use the same detachable installation interface as the pilot hole power head 61 of the pilot hole assembly 6, and can be detachably installed on the power head slide 5. The working state of the rotary drilling assembly 8 is adapted to the first pulley block 31. Only when the traction rope 41 is wound around the first pulley block 31 is it connected to the traction rope 41 of the main winch 4 for rotary drilling operations.

[0122] When the construction site is a conventional stratum such as soil or sand, and conventional rotary drilling is required, the rotary drilling assembly 8 is installed on the power head slide 5 through a detachable interface, and the traction rope 41 of the main winch 4 is wound around the first pulley block 31. The traction rope 41 provides stable lifting and lowering power support for the rotary drilling assembly 8. At the same time, the power head slide 5 drives the rotary drilling assembly 8 to move up and down along the mast 2, and in coordination with the rotation of the rotary drilling assembly 8, rotary drilling is performed on the construction stratum to remove soil and slag, gradually forming a pile hole that meets the design requirements, and completing the conventional rotary drilling construction.

[0123] When the construction site requires pile driving operations (for example, in hard rock, boulders, pebble layers, dense sand and gravel, etc., which are difficult to drive piles), the traction rope 41 of the main winch 4 is redirected to the second pulley block 32, and the hydraulic hammer assembly 7 is connected to the traction rope 41. The hydraulic hammer slide 72 is slidably installed on the guide rail of the mast 2 to drive the hammer body 71 to achieve vertical lifting and guidance along the guide rail of the mast 2.

[0124] The pilot hole assembly 6 is installed on the power head slide 5, so that the pilot hole drill 62 is misaligned with the hammer body 71, so that the pilot hole assembly 6 can be used to perform pilot hole operation on the target area.

[0125] After the pilot hole is completed, the precast pile 9 can be moved (e.g., hoisted) to the top of the pilot hole and positioned. The main unit 1 controls the lifting and lowering of the hydraulic hammer assembly 7 through the main winch 4. Driven by the hydraulic system of the main unit 1, the hydraulic hammer assembly 7 continuously hammers the precast pile 9 downwards, so that the precast pile 9 sinks into the design elevation along the pilot hole, realizing integrated continuous construction of pilot hole first and hammering later.

[0126] It should be understood that the embodiments of this application are not limited thereto. For example, under suitable construction conditions, the precast pile 9 can also be placed in the target area and the precast pile 9 can be directly hammered down to the target depth by the hydraulic hammer assembly 7.

[0127] The rotary drilling rig provided in this application can flexibly switch between three operating modes—rotary drilling, pilot hole drilling, and hammer pile driving—according to construction needs, without the need for additional specialized rotary drilling equipment, thus reducing construction costs. Furthermore, the rotary drilling assembly 8 and the pilot hole drilling assembly 6 share the design of the power head slide 5, resulting in a compact structure and convenient switching between operating modes. This eliminates the need to disassemble core components such as the mast 2 and gooseneck 3, shortening switching time, improving the overall operating efficiency of the equipment, and adapting to diverse construction needs in both conventional and difficult-to-drive pile strata.

[0128] Figure 12 The schematic diagram illustrates a centering principle of a hydraulic hammer and a long spiral according to an embodiment of this application.

[0129] According to embodiments of this disclosure, such as Figure 12 As shown, in the orthographic projection along the height direction, the projection center of the pilot hole drill 62 of the pilot hole assembly 6 and the projection center of the hammer body 71 of the hydraulic hammer assembly 7 are located at different parts on the circumference with the projection of the rotation axis of the host 1 as the center, so as to drive the vehicle body 11 to rotate and make the pilot hole drill 62 or the hydraulic hammer assembly 7 aligned with the target area.

[0130] In this embodiment, the pilot drill 62 or the hydraulic hammer assembly 7 can be easily aligned with the same target area (e.g., the center of a pile position) by rotating the vehicle body 11 relative to the chassis 12 around the axis of rotation, without moving the entire machine. This allows for rapid switching between two different working devices (pilot drilling and hammering) on ​​the same main unit, saving the extra time required for changing work positions or repeatedly disassembling and reassembling working devices in separate equipment. Furthermore, since both working devices are arranged on the same radius of rotation, rotating the vehicle body 11 by the corresponding angle ensures that the pilot drill 62 and the hammer 71 can be precisely aligned with the target area, avoiding secondary positioning errors and improving construction accuracy and efficiency. In addition, this layout simplifies the operation process, reduces the labor intensity of operators, and makes integrated construction with multiple functions smoother and more reliable.

[0131] Figure 13The schematic diagram illustrates another hydraulic hammer centered with a long spiral according to an embodiment of this application.

[0132] In some alternative embodiments, such as Figure 13 As shown, in the orthographic projection along the height direction, the projection center of the pilot hole drill 62 of the pilot hole assembly 6 and the projection center of the hammer body 71 of the hydraulic hammer assembly 7 are spaced apart in the traveling direction parallel to the host 1, so as to drive the host 1 to move so that the pilot hole drill 62 or the hydraulic hammer assembly 7 is aligned with the target area.

[0133] According to the embodiments of this disclosure, the distance between the projection center of the pilot hole drill 62 and the projection center of the hammer 71 in the direction of travel parallel to the host 1 can be understood as follows: when the vehicle body 11 drives the mast 2 to rotate relative to the chassis 12 by a certain angle (for example, any value among 0 degrees, 45 degrees, or 90 degrees), the distance between the projection center of the pilot hole drill 62 and the projection center of the hammer 71 in the direction of travel parallel to the host 1.

[0134] As an example, such as Figure 13 As shown, when the vehicle body 11 drives the mast 2 to rotate 90 degrees relative to the chassis 12, with Figure 13 From the perspective shown, the chassis 12 can move the vehicle body 11 up or down, so that the pilot drill 62 or the hydraulic hammer assembly 7 is aligned with the target area.

[0135] In actual operation, the overall position of the host 1 can be adjusted by moving the host 1, so that the pilot hole drill 62 can be moved to a position that is aligned with the target area, and then the pilot hole construction can be completed by the pilot hole drill 62. When it is necessary to switch the operation procedure, the host 1 can be driven forward or backward in the direction of travel to change the position of the host 1 until the hammer body 71 of the hydraulic hammer assembly 7 is aligned with the target area, and the corresponding hammering pile driving operation can be performed by the hammer body 71.

[0136] In this implementation, the switching between drilling and pile driving operations can be achieved simply by the linear movement of the main unit 1, without the need for complex rotation or multi-directional adjustment. The structure is simple, the alignment of the work positions is easy, construction efficiency is improved, and the accuracy of the operation is guaranteed.

[0137] Figure 14 A flowchart illustrating a rotary drilling rig construction method according to an embodiment of this application is shown schematically.

[0138] The embodiments of this application also provide a construction method using the rotary drilling rig in any of the above embodiments, which can realize the pilot hole and pile driving operations in actual engineering projects, such as... Figure 14 As shown, the construction method includes operation S1400-operation S1430.

[0139] When operating S1400, the drive hole assembly performs hole drilling operations on the target area, forming holes in the target area.

[0140] In operation S1410, the precast pile is placed above the pilot hole, and the axis of the precast pile is roughly aligned with the axis of the pilot hole.

[0141] When operating S1420, the drive unit moves the hydraulic hammer assembly above the precast pile.

[0142] When operating S1430, the hydraulic hammer assembly is driven to hammer the precast pile downwards, driving the precast pile downwards along the pilot hole.

[0143] In this embodiment, the same host machine is used for both the pilot hole drilling and the hammer driving machine, enabling continuous operation under the same reference. The same host machine positioning and movement system ensures good alignment between the pilot hole axis and the precast pile axis, guaranteeing the verticality and positional accuracy of the pile driving, reducing construction deviations, and avoiding errors caused by differences in positioning references when different equipment operates alternately. Furthermore, using a single host machine eliminates the need for dedicated piling equipment access and parking spaces, reducing the number of devices on the construction site. This not only lowers equipment rental and labor costs but also reduces the space occupied by the equipment.

[0144] Figures 15(a)-15(c) schematically illustrate the state change flowchart of a construction method for a rotary drilling rig according to an embodiment of the present application.

[0145] As shown in Figure 15(a), the host 1 drives the pilot hole assembly 6 to move to the preset target area, and the pilot hole drill 62 rotates to work on the soil in the target area until a pilot hole is formed with a depth and diameter that meet the design requirements.

[0146] After the pilot hole is completed, move the pilot hole assembly 6 upward along the mast 2 and exit the pilot hole.

[0147] The precast pile 9 is hoisted and placed directly above the pilot hole using hoisting equipment. The posture of the precast pile 9 is adjusted so that the central axis of the precast pile 9 roughly coincides with the central axis of the pilot hole, ensuring that the precast pile 9 and the pilot hole are arranged coaxially, thus avoiding problems such as displacement during subsequent pile driving.

[0148] As shown in Figure 15(b), the host 1 drives the hydraulic hammer assembly 7 to move to the position directly above the precast pile 9, and adjusts the center of the hydraulic hammer to align with the center of the top of the precast pile 9.

[0149] As shown in Figure 15(c), the hammer body 71 is driven by the hydraulic system to continuously and stably hammer the top of the precast pile 9 downwards. Under the action of the hammering force, the precast pile 9 gradually sinks into the preset elevation position of the soil along the pre-formed pilot hole, thus completing the construction of a single precast pile 9.

[0150] In this implementation method, the construction method of first drilling holes with the pre-drilling component 6 and then driving the pile with a hydraulic hammer can effectively reduce the sinking resistance of the precast pile 9, reduce the risk of pile damage, and at the same time, there is no need to change the construction equipment, which improves the construction efficiency and accuracy of the pile foundation and is suitable for pile foundation construction under various geological conditions.

[0151] According to embodiments of this disclosure, the drive host 1 moves the hydraulic hammer assembly 7 above the precast pile 9 by: rotating or translating the drive host 1 to disengage the pilot hole assembly 6 from the target area, and moving the hydraulic hammer assembly 7 above the precast pile 9.

[0152] As an example, in the orthographic projection along the height direction, the projection center of the borehole assembly 6's borehole drill 62 and the projection center of the hydraulic hammer assembly 7's hammer body 71 are located at different parts on the circumference with the projection of the host's rotation axis as the center. This can drive the vehicle body 11 to rotate relative to the chassis 12, causing the borehole assembly 6 to leave the target area while moving the hydraulic hammer assembly 7 above the precast pile 9.

[0153] Alternatively, in the orthographic projection along the height direction, the projection center of the borehole drill bit 62 of the borehole assembly 6 and the projection center of the hammer body 71 of the hydraulic hammer assembly 7 are spaced apart in the direction of travel parallel to the host machine. This can drive the host machine 1 to translate, that is, to move the host machine 1 along the preset direction of travel, so that the borehole assembly 6 leaves the target area while the hydraulic hammer assembly 7 moves to above the precast pile 9.

[0154] In this way, the dual actions of retracting the pilot hole assembly 6 and positioning the hydraulic hammer assembly 7 can be completed quickly with a single rotation or translation of the main unit 1. There is no need to adjust the positions of the pilot hole assembly 6 and the hydraulic hammer assembly 7 separately, which simplifies the operation process, shortens the interval between construction procedures, and improves the overall construction efficiency.

[0155] In the process of realizing this disclosure, it was also discovered that when the precast pile 9 is driven into the soil by the continuous hammering of the hydraulic hammer assembly 7, the soil at the pile bottom may form a plug due to compression or accumulation, resulting in a sudden increase in the resistance of the lower soil and the formation of a pile bottom plug. The pile bottom plug formed has high density and strength, which is equivalent to forming a hard soil plug or closure effect at the pile bottom, which will greatly increase the resistance at the pile end, making it extremely difficult for the precast pile 9 to continue to sink. Under the hammering of the hydraulic hammer, the pile may not be able to continue to penetrate, resulting in a hammer refusal phenomenon, which leads to the stagnation of construction.

[0156] Figure 16 The diagram illustrates a construction method using a rotary drilling rig according to an embodiment of this application in the case of pile bottom embolism.

[0157] In an exemplary embodiment, when the precast pile 9 is hammered downwards by the hydraulic hammer assembly 7, forming a pile bottom plug at the bottom of the precast pile 9, such as Figure 16 As shown, it also includes:

[0158] The drive unit 1 aligns the pilot hole assembly 6 with the precast pile 9, and the pilot hole assembly 6 passes through the precast pile 9 to guide the hole downwards, forming a pilot hole.

[0159] The hydraulic hammer assembly 7 of the drive host 1 is aligned with the precast pile 9, so that the precast pile 9 continues to sink downward along the advance guide hole.

[0160] like Figure 16 As shown, the controllable host 1 drives the pilot hole assembly 6 to rotate or translate, aligning the center of the pilot hole drill 62 with the central axis of the precast pile 9 that has been partially sunk into the soil. The pilot hole assembly 6 is controlled to pass through the internal cavity of the precast pile 9 and extend downward to the soil area below the pile bottom plug to perform pilot hole operation. By cutting and removing the surrounding plugging soil, an advanced pilot hole that meets the depth design requirements is formed at the original plug position, providing a smooth sinking channel for the precast pile 9 and effectively removing the plug blockage.

[0161] After the second pre-drilling is completed, the main unit 1 can be driven again to remove the pre-drilling assembly 6 from the precast pile 9, and the hydraulic hammer assembly 7 can be moved to the top of the precast pile 9. The hydraulic hammer assembly 7 is started to continuously hammer the precast pile 9, and the precast pile 9 can continue to sink into the soil smoothly and with low resistance along the pre-formed pre-drilling hole until the precast pile 9 is sunk to the preset elevation, thus completing the construction of a single precast pile 9.

[0162] This collaborative operation mode, which involves drilling, driving piles, removing emboli, and driving piles again, overcomes the construction difficulties caused by pile bottom emboli, avoids damage to the precast piles due to forced hammering, and improves the safety and reliability of pile foundation construction under complex geological conditions.

[0163] Figures 17(a)-17(c) schematically illustrate the process flow of switching between two construction modes of a rotary drilling rig according to an embodiment of the present application.

[0164] The rotary drilling rig provided in this application can switch between rotary drilling operation mode and hammering operation mode on a single host machine.

[0165] When switching from rotary drilling operation mode to hammer drilling operation mode, as shown in Figure 17(a), the rotary drill bit 82 in the rotary drilling assembly 8 can be removed from the telescopic drill rod 83.

[0166] As shown in Figure 17(b), the rotary drilling power head 81 of the rotary drilling assembly 8 moves to its lowest point on the mast 2 via the power head carriage 5, causing the telescopic drill rod 83 to disengage from the rotary drilling power head 81. The mast 2 is then tilted forward, and the telescopic drill rod 83 of the rotary drilling rig is removed. The rotary drilling power head 81 is then removed from the mounting portion 52 of the power head carriage 5 below the mast 2.

[0167] As shown in Figure 17(c), the mast 2 is tilted to a roughly horizontal position, and the traction rope 41 of the main winch 4 is switched from the first pulley group 31 to the second pulley group 32 and connected to the hammer body 71 of the hydraulic hammer assembly 7. The hammer body 71 is mounted on the guide rail of the mast 2 through the hydraulic hammer slide 72.

[0168] Install the pilot hole power head 61 of the pilot hole assembly 6 onto the mounting part 52 of the power head carriage 5. Install the pilot hole drill 62 of the pilot hole assembly 6 onto the pilot hole power head 61, and restore the mast 2 to a vertical angle (e.g., Figure 1 (As shown in the diagram), the construction mode switch is completed. The above switching process is a preferred implementation method. The order of each operation step can be interchanged or adjusted under permissible conditions, and is not limited to the above order.

[0169] It should be understood that switching from hammer drilling mode to rotary drilling mode is the reverse of the above process, and the specific steps can be reversed as described above.

[0170] For example, the mast 2 can be tilted forward to a roughly horizontal position, the pilot hole drill 62 can be removed from the pilot hole power head 61, and the pilot hole power head 61 can be removed from the power head carriage 5.

[0171] Switch the traction rope 41 of the main winch 4 from the second pulley block 32 back to the first pulley block 31 and separate it from the hydraulic hammer assembly 7, and remove the hydraulic hammer assembly 7 from the mast 2.

[0172] Reinstall the rotary drilling power head 81 to the mounting part 52 of the power head slide 5, and reinstall the telescopic drill rod 83 into the rotary drilling power head 81.

[0173] Reinstalling the rotary drill bit 82 back onto the telescopic drill rod 83 and restoring the mast to a vertical position completes the switch from hammer drilling mode to rotary drilling mode. Similarly, the sequence of steps in this reverse switching process can be adjusted according to actual conditions. The embodiments of this application have been described above. However, these embodiments are merely illustrative and not intended to limit the scope of this application. Although various embodiments have been described above, this does not mean that the measures in the various embodiments cannot be used advantageously in combination. The scope of this application is defined by the appended claims and their equivalents. Various substitutions and modifications can be made by those skilled in the art without departing from the scope of this application, and all such substitutions and modifications should fall within the scope of this application.

Claims

1. A rotary drilling rig, characterized in that, include: Host; The mast is mounted on the main unit; A goose head is set at the top of the mast. The goose head has a first pulley group and a second pulley group. The distance from the second pulley group to the mast is less than the distance from the first pulley group to the mast. The main winch is located on the host machine, and the traction rope of the main winch is selectively wound around the first pulley block or the second pulley block; The power head carriage is slidably mounted on the mast along the mast; The pilot hole assembly is detachably mounted on the power head carriage to perform pilot hole operations in the target area to form pilot holes; The hydraulic hammer assembly, with the traction rope wound around the second pulley group, is connected to the traction rope and, driven by the main unit, is aligned with the precast pile placed above the pilot hole, and hammers the precast pile downwards.

2. The rotary drilling rig according to claim 1, characterized in that, The host includes: Vehicle body; Chassis, wherein the vehicle body is configured to rotate about an axis of rotation relative to the chassis; In the orthographic projection along the height direction, the projection center of the pilot hole drill of the pilot hole assembly and the projection center of the hammer body of the hydraulic hammer assembly are located at different parts on the circumference with the projection of the rotation axis of the host as the center, so as to drive the vehicle body to rotate and make the pilot hole drill or the hydraulic hammer assembly aligned with the target area.

3. The rotary drilling rig according to claim 1, characterized in that, In the orthographic projection along the height direction, the projection center of the pilot hole drill of the pilot hole assembly and the projection center of the hammer body of the hydraulic hammer assembly are spaced apart in the direction of travel parallel to the host machine, so as to drive the host machine to move so that the pilot hole drill or the hydraulic hammer assembly is aligned with the target area.

4. The rotary drilling rig according to claim 1, characterized in that, Goose head includes: The third pulley block is suitable for guiding the traction rope to be wound around the first pulley block or the second pulley block; The load-bearing frame includes: The first arm is connected to the mast, and the third pulley block is disposed at the first end of the first arm; The second arm extends obliquely upward from the second end of the first arm, and the first pulley group and the second pulley group are arranged at intervals on the second arm.

5. The rotary drilling rig according to claim 4, characterized in that, Also includes: The rotary drilling assembly is detachably mounted on the power head slide and is suitable for connecting with the traction rope to perform rotary drilling operations when the traction rope is wound around the first pulley block.

6. The rotary drilling rig according to claim 5, characterized in that, The goose head also includes: A lifting device, with the traction rope wound around the first pulley block, is connected between the traction rope and the rotary drilling assembly, and is adapted to allow the rotary drilling assembly to rotate relative to the traction rope during operation.

7. The rotary drilling rig according to claim 5, characterized in that, The power head carriage includes: The main body is slidably mounted on the mast; The mounting section is located on the side of the main body opposite to the mast. Suitable for mounting the pilot hole assembly in a pilot hole power head, or for mounting the rotary drilling assembly.

8. A construction method for a rotary drilling rig as described in any one of claims 1-7, characterized in that, include: The drilling assembly is driven to perform drilling operations on the target area, so that the target area forms a drilling hole; Place the precast pile above the pilot hole, and make the axis of the precast pile approximately coincide with the axis of the pilot hole; The host is driven to move the hydraulic hammer assembly above the precast pile; The hydraulic hammer assembly is driven to hammer the precast pile downwards, causing the precast pile to sink downwards along the pilot hole.

9. The construction method according to claim 8, characterized in that, Driving the main unit to move the hydraulic hammer assembly above the precast pile includes: The host machine is driven to rotate or translate, causing the borehole assembly to move away from the target area and the hydraulic hammer assembly to move above the precast pile.

10. The construction method according to claim 9, characterized in that, In the case where the precast pile is hammered downwards by the hydraulic hammer assembly, forming a pile bottom plug at the bottom of the precast pile, the method further includes: The host is driven to align the pilot hole assembly with the precast pile, and the pilot hole assembly passes through the precast pile to drill a downward hole, forming a pilot hole; The hydraulic hammer assembly of the main unit is driven to align with the precast pile, so that the precast pile continues to sink downward along the advance guide hole.

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