Square hole pile hole forming device and construction method
Patent Information
- Application Number
- CN202611360534.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-09-03
- Publication Date
- 2026-10-20
AI Technical Summary
[0002]现有的方孔施工普遍存在工序繁琐与成孔质量难以保证的问题
[0012]本发明的有益效果在于：先导钻头的轴线与主驱动钻杆的主轴线重合，优先切削桩位中心区域的土体形成圆形先导孔，承担了大部分土体切削任务；同时，偏心行星齿轮传动机构驱动连接有莱洛修孔钻头的次驱动钻杆产生自转与公转结合的偏心复合运动，使位于上方的莱洛修孔钻头仅对圆形先导孔外侧的角部及边部剩余土体进行修切，通过分级切削显著降低了单个钻头的切削面积与驱动扭矩，减小了钻进阻力与侧向载荷，克服了直接切削整个方孔断面易卡钻、偏孔的问题，在确保方孔垂直度与孔形精度的同时，实现了一次钻进直接成型标准方孔。
Smart Images
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Abstract
Description
Technical Field
[0001] This invention relates to the field of square pile construction technology, specifically to a square hole drilling device and construction method for square hole piles. Background Technology
[0002] Existing methods for constructing square holes generally suffer from cumbersome procedures and difficulty in guaranteeing hole quality. Traditional methods often involve drilling a circular hole first and then manually or mechanically squaring it. This not only involves numerous procedures and low construction efficiency but also easily leads to rough hole walls, irregular hole shapes, and difficulty in controlling verticality. If a hydraulic telescopic square drill bit is used for direct cutting, its complex structure makes it prone to problems such as diameter reduction, stuck drill, or hole deviation in soft soil or high-water-level strata. If precast square piles are used for static pressure or hammer driving, there is a significant soil squeezing effect and construction noise, and the pile is prone to breakage. In addition, the method of directly cutting the entire square hole cross-section has the problems of high soil breaking resistance and high driving torque requirements, making it difficult to balance construction efficiency and deep hole accuracy. Summary of the Invention
[0003] The purpose of this invention is to provide a square hole drilling pile forming device and construction method, which can reduce the cutting area and driving torque of a single drill bit through staged cutting, reduce drilling resistance and lateral load, overcome the problems of easy drill jamming and hole deviation when directly cutting the entire square hole cross section, and achieve the direct forming of a standard square hole in one drilling while ensuring the verticality and hole shape accuracy of the square hole.
[0004] To achieve the above objectives, according to a first aspect of the present invention, a square hole drilling device is provided, comprising: An eccentric double drill rod mechanism includes a vertically arranged main drive drill rod and a secondary drive drill rod, wherein there is a horizontal eccentricity between the main axis of the main drive drill rod and the secondary axis of the secondary drive drill rod; A power drive mechanism, connected to the main drive drill rod, is used to drive the main drive drill rod to rotate; An eccentric planetary gear transmission mechanism is connected between the main drive drill rod and the secondary drive drill rod to perform eccentric transmission; Composite drilling mechanism, including: A pilot drill bit is used to cut and form a circular pilot hole, wherein the axis of the pilot drill bit coincides with the main axis. The Leroy hole-cutting drill bit, positioned above the pilot drill bit and connected to the secondary drive drill rod, is used to cut and form a target square hole; An eccentric connecting rod is provided, with one end connected to the secondary drive drill rod and the other end connected to the center of the pilot drill bit.
[0005] Optionally, the eccentric planetary gear transmission mechanism includes: A transmission housing is disposed at the lower end of the main drive drill rod, and a protective cover is fitted on the outside of the transmission housing; A sun gear is disposed within the transmission housing, and the center of the sun gear is connected to the main drive drill pipe; An eccentric planetary gear is disposed inside and meshes with the sun gear. The center of the eccentric planetary gear is connected to the secondary drive drill pipe, and is used to drive the secondary drive drill pipe to rotate around the secondary axis while revolving around the main axis.
[0006] Optionally, the eccentric connecting rod has a bent structure, including: The upper connecting section is connected to the secondary drive drill pipe; The lower connecting section is connected to the center of the pilot drill bit; A transition section is obliquely connected between the upper connecting section and the lower connecting section; A protective sleeve is fitted onto the outside of the transition section.
[0007] Optionally, the Leroy hole-cutting drill bit includes a connecting disc fixedly sleeved on the secondary drive drill rod and three arc-shaped cutting sections evenly distributed along the circumference of the connecting disc, and the outer edges of the three arc-shaped cutting sections combine to form a Leroy triangle fixed-width profile.
[0008] Optionally, the arc-shaped cut portion is provided with: Carbide cutting teeth are spaced apart on the outer edge of each of the arc-shaped cutting portions; A slag discharge channel is provided between adjacent carbide cutting teeth to allow the soil generated during trimming to fall into the circular pilot hole.
[0009] Optionally, the square hole drilling device further includes a grout channel, which is axially located inside or on the side of the main drive drill rod and the secondary drive drill rod and is connected to an external grout delivery system. The grout channel extends through a pipeline to the Lelo repair drill bit and / or the pilot drill bit.
[0010] Optionally, the horizontal eccentricity is 0.05-0.12 times the designed side length of the target square hole; The vertical distance between the Lelo hole-cutting drill bit and the pilot drill bit is 500mm-1500mm.
[0011] According to a second aspect of the present invention, a construction method for a square hole drilling pile forming device is provided, comprising the following steps: Connect the main drive drill rod to the power drive mechanism, and adjust the verticality of the drilling rig so that the main axis of the main drive drill rod coincides with the center of the designed pile position; The power drive mechanism is activated, driving the main drive drill rod to rotate and drill the pilot drill bit, cutting the soil in the central area of the pile position to form a circular pilot hole with the main axis as the central axis. During the drilling process, the Leroy finishing drill bit cuts into the circular pilot hole, and the eccentric planetary gear transmission mechanism drives the secondary drive drill rod and the Leroy finishing drill bit to generate an eccentric composite motion that rotates around the secondary axis and revolves around the main axis. The Reilly drill bit forms a Reilly triangle envelope trajectory under eccentric compound motion, and only cuts the remaining soil outside the circular pilot hole, expanding the circular pilot hole into the target square hole. The soil debris produced by the Lelo drilling bit falls into the circular pilot hole and is discharged through slurry circulation. The pilot drill bit and the Leroy hole-drilling drill bit maintain a fixed vertical distance and drill downwards synchronously until the designed hole depth is reached.
[0012] The beneficial effects of this invention are as follows: the axis of the pilot drill bit coincides with the main axis of the main drive drill rod, preferentially cutting the soil in the central area of the pile position to form a circular pilot hole, undertaking most of the soil cutting tasks; at the same time, the eccentric planetary gear transmission mechanism drives the secondary drive drill rod connected with the Leroy hole-cutting drill bit to generate an eccentric composite motion combining rotation and revolution, so that the Leroy hole-cutting drill bit located above only cuts the remaining soil at the corners and edges outside the circular pilot hole. Through staged cutting, the cutting area and driving torque of a single drill bit are significantly reduced, the drilling resistance and lateral load are reduced, and the problems of easy jamming and hole deviation when directly cutting the entire square hole cross section are overcome. While ensuring the verticality and hole shape accuracy of the square hole, a standard square hole can be directly formed in one drilling operation.
[0013] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, the preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings. Attached Figure Description
[0014] Figure 1 This is a schematic structural diagram of a square hole drilling device according to an embodiment of the present invention; Figure 2 This is a schematic structural diagram of an eccentric planetary gear transmission mechanism and a Leroy drilling bit for a square hole pile forming device according to an embodiment of the present invention. Figure 3 This is a schematic structural diagram of an eccentric connecting rod of a square hole drilling device according to an embodiment of the present invention; Figure 4 This is a schematic flowchart illustrating a construction method for a square hole drilling pile forming device according to an embodiment of the present invention; In the diagram: 1. Eccentric double drill rod mechanism; 11. Main drive drill rod; 12. Secondary drive drill rod; 2. Eccentric planetary gear transmission mechanism; 21. Transmission housing; 22. Sun gear; 23. Eccentric planetary gear; 3. Composite drilling mechanism; 31. Pilot drill bit; 32. Leroy dressing drill bit; 321. Connecting disc; 322. Arc-shaped cutting section; 323. Carbide cutting teeth; 33. Eccentric connecting rod; 331. Upper connecting section; 332. Lower connecting section; 333. Transition section; 4. Slurry channel. Detailed Implementation
[0015] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0016] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0017] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. Furthermore, the technical features involved in the different embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.
[0018] Please see Figure 1A preferred embodiment of this application shows a square hole drilling device comprising an eccentric double drill rod mechanism 1, a power drive mechanism, an eccentric planetary gear transmission mechanism 2, and a composite drilling mechanism 3. The eccentric double drill rod mechanism 1 includes a vertically arranged main drive drill rod 11 and a secondary drive drill rod 12, with a horizontal eccentricity between the main axis of the main drive drill rod 11 and the secondary axis of the secondary drive drill rod 12. The power drive mechanism is connected to the main drive drill rod 11 and is used to drive the main drive drill rod 11 to rotate. The eccentric planetary gear transmission mechanism 2 is connected between the main drive drill rod 11 and the secondary drive drill rod 12 for eccentric transmission. The composite drilling mechanism 3 includes a pilot drill bit 31, a Leylow finishing drill bit 32, and an eccentric connecting rod 33. The pilot drill bit 31 is used to cut and form a circular pilot hole, and the axis of the pilot drill bit 31 coincides with the main axis. The Leylow finishing drill bit 32 is disposed above the pilot drill bit 31 and connected to the secondary drive drill rod 12, and is used to cut and form the target square hole. One end of the eccentric connecting rod 33 is connected to the secondary drive drill pipe 12, and the other end of the eccentric connecting rod 33 is connected to the center of the pilot drill bit 31.
[0019] According to the solution of the embodiment of the present invention, The following detailed description uses specific examples: Specifically, in this embodiment, the power drive mechanism is mounted on a ground frame and includes a power head, a reduction mechanism, an output shaft, and a lifting mechanism. The power head is connected to the main drive drill rod 11 via the reduction mechanism and is used to transmit rotational power to the main drive drill rod 11 to drive its rotation; the lifting mechanism is connected to the main drive drill rod 11 and is used to control the entire eccentric double drill rod mechanism 1 to press down or lift in the vertical direction to realize drilling, drill lifting, and hole cleaning operations.
[0020] Specifically, please see Figure 2 The eccentric planetary gear transmission mechanism 2 includes a transmission housing 21, a sun gear 22, and eccentric planetary gears 23. The transmission housing 21 is located at the lower end of the main drive drill rod 11, and a protective cover is fitted over its outer side. The sun gear 22 is located inside the transmission housing 21, and its center is connected to the main drive drill rod 11. The eccentric planetary gear 23 is located inside and meshes with the sun gear 22, and its center is connected to the secondary drive drill rod 12, driving the secondary drive drill rod 12 to rotate around its secondary axis while simultaneously revolving around its main axis. Through the meshing transmission between the sun gear 22 and the eccentric planetary gear 23 within the transmission housing 21, the rotational power input from the main drive drill rod 11 is mechanically transmitted to the secondary drive drill rod 12, enabling the secondary drive drill rod 12 to rotate around its secondary axis while simultaneously revolving stably around its main axis. Compared to complex hydraulic mechanisms, purely mechanical gear meshing transmissions have higher structural stability and load-bearing capacity, enabling them to adapt to harsh construction environments such as mud and groundwater. Meanwhile, the protective cover on the outside effectively prevents mud, sand, and groundwater from intruding into the transmission mechanism, ensuring the durability and smooth operation of the transmission system.
[0021] Specifically, please see Figure 3 The eccentric connecting rod 33 has a bent structure, including an upper connecting section 331, a lower connecting section 332, a transition section 333, and a protective sleeve. The upper connecting section 331 is connected to the secondary drive drill pipe 12, and the lower connecting section 332 is connected to the center of the pilot drill bit 31. The transition section 333 is obliquely connected between the upper connecting section 331 and the lower connecting section 332, and the protective sleeve is fitted on the outside of the transition section 333. The upper connecting section 331 connects to the secondary drive drill rod 12, the lower connecting section 332 connects to the center of the pilot drill bit 31, and the inclined transition section 333 facilitates the axial offset transition, successfully overcoming the horizontal eccentricity between the main drive drill rod 11 and the secondary drive drill rod 12. This ensures that the pilot drill bit 31, located at the bottom, can always rotate stably around the main axis for drilling, providing precise vertical guidance for the entire device. At the same time, the protective sleeve fitted on the outside of the transition section 333 can effectively prevent the soil and drill cuttings during the excavation process from directly impacting the bent part of the eccentric connecting rod 33, improving the structural strength and service life of the eccentric connecting rod 33.
[0022] Specifically, please see Figure 2 The Reilly hole-cutting drill bit 32 includes a connecting disc 321 and arc-shaped cutting sections 322. The connecting disc 321 is fixedly mounted on the secondary drive drill rod 12 by welding. Three arc-shaped cutting sections 322 are evenly distributed around the outer periphery of the connecting disc 321 along the circumference, and the outer edges of the three arc-shaped cutting sections 322 combine to form a Reilly triangle with a fixed width profile. The arc-shaped cutting section 322 is provided with carbide cutting teeth 323 and a slag discharge channel. The carbide cutting teeth 323 are spaced apart on the outer edge of each arc-shaped cutting section 322. The slag discharge channel is located between adjacent carbide cutting teeth 323 to allow the soil generated during cutting to fall into the circular pilot hole. The carbide cutting teeth 323 embedded on the outer edge of the arc-shaped cutting section 322 significantly improve the soil breaking wear resistance, and the slag discharge channel left between adjacent cutting teeth allows the soil generated during trimming to fall smoothly into the circular pilot hole below, effectively preventing soil from accumulating and clogging around the trimming drill bit and eliminating the risk of stuck drill.
[0023] In other embodiments, the connecting plate 321 can be replaced with a flange that is detachably fitted onto the secondary drive drill pipe 12 with bolts.
[0024] Further, please see Figure 1The square hole drilling device also includes a slurry channel 4, which is axially located inside or on the side of the main drive drill rod 11 and the secondary drive drill rod 12, and is connected to an external slurry delivery system. The slurry channel 4 extends through pipelines to the Lailo repair drill bit 32 and / or the pilot drill bit 31. In the actual slag removal process, the slurry channel 4 has water spray nozzles at the ends of the pipelines at the Lailo repair drill bit 32 and the pilot drill bit 31, which connect to the external borehole. The external slurry delivery system sprays high-pressure slurry from the water spray nozzles through the slurry channel 4 to the cutting area. The sprayed slurry cools and lubricates the cutting teeth, and mixes with the soil slag generated by the cutting of the pilot drill bit 31 and the repair soil slag falling into the circular pilot hole from the slag removal channel to form mud. The central circular pilot hole serves as a natural mud circulation slag removal channel, carrying the soil slag upwards with the circulating mud and discharging it to the ground sedimentation tank, achieving continuous and efficient fluid circulation slag removal.
[0025] Specifically, the horizontal eccentricity is 0.05-0.12 times the designed side length of the target square hole. The vertical distance between the Leroy hole-cutting drill bit 32 and the pilot drill bit 31 is 500mm-1500mm. In this embodiment, the side length of the target square hole is 600mm, and the horizontal eccentricity is 48mm, which is 0.08 times the side length of the square hole. The vertical distance between the Leroy hole-cutting drill bit 32 and the pilot drill bit 31 is 1000mm. The pilot drill bit 31 can be any one of a tapered drill bit, a three-wing scraper drill bit, a roller cone drill bit, a barrel drill bit, a auger drill bit, or a combined earth-breaking drill bit.
[0026] Please see Figure 4 This application also provides a construction method for a square hole drilling pile forming device, including the following steps: Step S10: Connect the main drive drill rod 11 to the power drive mechanism, adjust the verticality of the drilling rig, and make the main axis of the main drive drill rod 11 coincide with the center of the designed pile position; Step S20: Start the power drive mechanism to drive the main drive drill rod 11 to rotate and drill the pilot drill bit 31 to cut the soil in the central area of the pile position and form a circular pilot hole with the main axis as the central axis. Step S30: During the drilling process, the Leroy finishing drill bit 32 cuts into the circular pilot hole, and the eccentric planetary gear transmission mechanism 2 drives the secondary drive drill rod 12 and the Leroy finishing drill bit 32 to generate an eccentric composite motion that rotates around the secondary axis and revolves around the main axis. Step S40: The Reilly drill bit 32 forms a Reilly triangle envelope trajectory under eccentric compound motion, and only cuts the remaining soil outside the circular pilot hole, expanding the circular pilot hole into the target square hole. Step S50: The soil debris produced by the Leroy repair drill bit 32 falls into the circular pilot hole and is discharged through slurry circulation; Step S60: The pilot drill bit 31 and the Leroy hole-drilling drill bit 32 maintain a fixed vertical spacing and drill downwards synchronously until the designed hole depth is reached.
[0027] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0028] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.
Claims
1. A square hole drilling device for pile forming, characterized in that, include: An eccentric double drill rod mechanism includes a vertically arranged main drive drill rod and a secondary drive drill rod, wherein there is a horizontal eccentricity between the main axis of the main drive drill rod and the secondary axis of the secondary drive drill rod; A power drive mechanism, connected to the main drive drill rod, is used to drive the main drive drill rod to rotate; An eccentric planetary gear transmission mechanism is connected between the main drive drill rod and the secondary drive drill rod to perform eccentric transmission; Composite drilling mechanism, including: A pilot drill bit is used to cut and form a circular pilot hole, wherein the axis of the pilot drill bit coincides with the main axis. The Leroy hole-cutting drill bit, positioned above the pilot drill bit and connected to the secondary drive drill rod, is used to cut and form a target square hole; An eccentric connecting rod is provided, with one end connected to the secondary drive drill rod and the other end connected to the center of the pilot drill bit.
2. The square hole drilling device according to claim 1, characterized in that, The eccentric planetary gear transmission mechanism includes: A transmission housing is disposed at the lower end of the main drive drill rod, and a protective cover is fitted on the outside of the transmission housing; A sun gear is disposed within the transmission housing, and the center of the sun gear is connected to the main drive drill pipe; An eccentric planetary gear is disposed inside and meshes with the sun gear. The center of the eccentric planetary gear is connected to the secondary drive drill pipe, and is used to drive the secondary drive drill pipe to rotate around the secondary axis while revolving around the main axis.
3. The square hole drilling device according to claim 1, characterized in that, The eccentric connecting rod has a bent structure, including: The upper connecting section is connected to the secondary drive drill pipe; The lower connecting section is connected to the center of the pilot drill bit; A transition section is obliquely connected between the upper connecting section and the lower connecting section; A protective sleeve is fitted onto the outside of the transition section.
4. The square hole drilling device according to claim 1, characterized in that, The Lelo hole-cutting drill bit includes a connecting disc fixedly sleeved on the secondary drive drill rod and three arc-shaped cutting sections evenly distributed along the circumference of the connecting disc, and the outer edges of the three arc-shaped cutting sections combine to form a Lelo triangle fixed-width profile.
5. The square hole drilling device according to claim 4, characterized in that, The arc-shaped cutting section is provided with: Carbide cutting teeth are spaced apart on the outer edge of each of the arc-shaped cutting portions; A slag discharge channel is provided between adjacent carbide cutting teeth to allow the soil generated during trimming to fall into the circular pilot hole.
6. The square hole drilling device according to claim 1, characterized in that, It also includes a slurry channel, which is axially located inside or on the side of the main drive drill rod and the secondary drive drill rod and is connected to an external slurry delivery system. The slurry channel extends through a pipeline to the Leylow repair drill bit and / or the pilot drill bit.
7. The square hole drilling device according to claim 1, characterized in that, The horizontal eccentricity is 0.05-0.12 times the designed side length of the target square hole; The vertical distance between the Lelo hole-cutting drill bit and the pilot drill bit is 500mm-1500mm.
8. A construction method for a square-hole pile drilling device as described in any one of claims 1-7, characterized in that, Includes the following steps: Connect the main drive drill rod to the power drive mechanism, and adjust the verticality of the drilling rig so that the main axis of the main drive drill rod coincides with the center of the designed pile position; The power drive mechanism is activated, driving the main drive drill rod to rotate and drill the pilot drill bit, cutting the soil in the central area of the pile position to form a circular pilot hole with the main axis as the central axis. During the drilling process, the Leroy finishing drill bit cuts into the circular pilot hole, and the eccentric planetary gear transmission mechanism drives the secondary drive drill rod and the Leroy finishing drill bit to generate an eccentric composite motion that rotates around the secondary axis and revolves around the main axis. The Reilly drill bit forms a Reilly triangle envelope trajectory under eccentric compound motion, and only cuts the remaining soil outside the circular pilot hole, expanding the circular pilot hole into the target square hole. The soil debris produced by the Lelo drilling bit falls into the circular pilot hole and is discharged through slurry circulation. The pilot drill bit and the Leroy hole-drilling drill bit maintain a fixed vertical distance and drill downwards synchronously until the designed hole depth is reached.