Pile driving assembly and walking type pile driver
By designing a soil core containing section in the part of the borehole that is not occupied by the helical blades, the soil core is loosened by sucking in soil slag through the air extraction hole and spraying high-pressure gas through the air jet hole, combined with the soil core being crushed by the scraper. This solves the problem of difficult slag removal caused by the compaction of the soil core at the bottom of the borehole, and improves the piling efficiency and equipment life.
Patent Information
- Application Number
- CN202511739134.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-25
- Publication Date
- 2026-01-20
AI Technical Summary
The portion of the borehole not occupied by the auger blades at the bottom of the existing walking pile driver's borehole leads to soil core compaction, resulting in difficulties in slag removal, low efficiency, increased energy consumption and equipment wear, becoming a bottleneck for improving construction efficiency.
A soil core containing section is designed in the part of the borehole barrel not occupied by the auger blades. Air extraction holes and jet holes are installed. The air extraction holes are used to suck in soil slag, and the jet holes are used to spray high-pressure gas to loosen the soil core. Combined with the scraper to crush the soil core, the slag discharge efficiency is improved.
It significantly improves slag removal efficiency, reduces the risk of blockage, increases overall piling speed, and extends equipment service life, making it particularly suitable for difficult geological conditions such as hard soil or clay.
Smart Images
Figure CN121363370A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to a pile driving assembly and a walking pile driver, and belongs to the technical field of pile drivers. BACKGROUND
[0002] In the construction of the bite pile, the walking pile driver is a commonly used equipment. In the prior art, the pile driving assembly for implementing the pile driving operation is usually composed of a drilling cylinder and a residue discharging rod arranged in the drilling cylinder. In operation, the drilling cylinder is driven to rotate, and the bottom end of the drilling cylinder drills the soil to form a pile hole. At the same time, the residue discharging rod rotates in the drilling cylinder, and the residue discharging rod relies on the spiral blades arranged on the outer wall of the residue discharging rod to upwardly transport and discharge the soil residue generated by the drilling. However, the structure has the following defects: the part of the cylinder wall of the drilling cylinder extending upward from the bottom end is not occupied by the spiral blades to form a space for accommodating the soil core, which makes the soil entering the part in a cylindrical shape and relatively compacted. The bottom end of the spiral blade needs to directly process the compacted soil core, which makes the process of feeding the soil core into the spiral blade very difficult, and easily causes blockage or poor residue discharging. This problem directly leads to poor residue discharging effect and low efficiency, which not only increases the energy consumption and equipment wear, but also delays the overall pile driving progress due to the untimely residue discharging, and becomes a key bottleneck restricting the improvement of the construction efficiency. SUMMARY
[0003] The purpose of the present application is to provide a pile driving assembly and a walking pile driver to improve the overall efficiency of the pile drilling.
[0004] The present application is achieved by the following technical solutions.
[0005] A pile driving assembly, comprising a drilling cylinder, a residue discharging rod located in the drilling cylinder, a drill bit formed at the bottom end of the residue discharging rod, and spiral blades arranged on the outer wall of the residue discharging rod, wherein the drilling cylinder has a soil core accommodating section not occupied by the spiral blades, the residue discharging rod is provided with an air suction channel forming an air suction hole at the bottom end of the drill bit, and a gas injection channel forming a plurality of gas injection holes in the peripheral wall of the drill bit;
[0006] The drilling cylinder is configured to be driven to rotate so that the bottom end of the drilling cylinder drills a pile hole and the soil core enters the soil core accommodating section; the residue discharging rod is configured to be driven to rotate so that the drill bit breaks the soil core, the air suction hole sucks part of the soil residue, the gas injection hole circumferentially injects high-pressure gas to loosen the soil core, and the spiral blades continuously discharge the loosened soil core upward.
[0007] As a further improvement of the present application, a plurality of scrapers are circumferentially arranged in the soil core accommodating section, and the scrapers have soil scraping edges for breaking the soil core entering the soil core accommodating cavity.
[0008] As a further improvement of the present application, the position of the scraper in the soil core accommodating section is adapted to make the soil scraping edge face the gas injection range of the gas injection hole.
[0009] As a further improvement of the present application, a plurality of blade grooves are arranged on the soil scraping blade.
[0010] As a further improvement of the present application, the scraper is rotatably arranged on the inner wall of the soil core accommodating section, and is adapted to be rotated by the soil core pressing against the inner wall of the soil core accommodating section, and the scraper is provided with an elastic member to drive it to rotate back.
[0011] As a further improvement of the present application, the inner wall of the soil core accommodating section is provided with a base frame corresponding to the position of the scraper, and the base frame is provided with a rotating shaft as the rotating axis of the scraper; the side of the scraper away from the soil scraping blade is rotatably sleeved on the rotating shaft, and the elastic member is a torsion spring sleeved on the rotating shaft, and one end of the torsion spring acts on the scraper and the other end acts on the base frame.
[0012] As a further improvement of the present application, an inner pipe is arranged in the residue discharging rod, the space in the inner pipe forms an air suction channel, and the space between the residue discharging rod and the inner pipe forms an air injection channel.
[0013] As a further improvement of the present application, a plurality of drill teeth are arranged on the circumferential edge of the bottom end of the drill cylinder.
[0014] As a further improvement of the present application, the drill bit is in a conical structure.
[0015] A walking pile driver comprises a pile driving assembly.
[0016] The present application has the following beneficial effects:
[0017] The suction of the air suction hole not only reduces the solid part of the soil core, but also creates internal voids, making the soil core loose; the high-pressure gas impact of the air injection hole externally disintegrates the cohesion of the soil core, and the two work together to significantly reduce the ramming degree of the soil core, making it easier for the spiral blade to grab and lift the soil core, which not only improves the residue discharging efficiency and reduces the risk of locked-rotor, but also improves the overall pile driving speed, especially suitable for hard soil or clay and other difficult geological conditions. In addition, due to smooth residue discharging, the wear of the pile driving assembly is also reduced, prolonging the service life. BRIEF DESCRIPTION OF DRAWINGS
[0018] The preferred embodiments of the present application will be described in detail below with the help of the accompanying drawings, so as to help understand the purposes and advantages of the present application, in which:
[0019] Fig. 1 Fig. 1 is a structural schematic diagram of the pile driving assembly;
[0020] Fig. 2 Fig. 2 is a partial sectional view of the pile driving assembly. DETAILED DESCRIPTION
[0021] The present application will be further described in detail below according to the drawings and embodiments.
[0022] The orientation terms up, down, left, right, front, back, top, bottom, and the like mentioned or possibly mentioned in the present specification are defined with respect to the configuration shown in the respective drawings, and the words "inner" and "outer" refer to the direction toward or away from the geometric center of a particular component, which are relative concepts, and thus can change accordingly depending on the different positions, different use states. Therefore, these or other orientation terms should not be interpreted as limiting terms.
[0023] Embodiment 1:
[0024] The present embodiment shows a piling assembly capable of improving the efficiency of residue discharge, with reference to Figs. 1-2 The piling assembly mainly includes a drilling cylinder 1, a residue discharge rod 2, a drill bit 21, and a spiral blade 22. The drilling cylinder 1 is a hollow cylindrical structure, usually made of high-strength steel material, with sufficient rigidity and wear resistance to adapt to complex geological conditions underground. The residue discharge rod 2 is located inside the drilling cylinder 1 and is coaxially arranged with the drilling cylinder 1. The bottom end of the residue discharge rod 2 is fixed with the drill bit 21, which is usually made of hard alloy material to enhance the soil breaking capacity. The spiral blade 22 is arranged on the outer wall of the residue discharge rod 2 and spirally extends along the axial direction of the residue discharge rod 2, but the spiral blade 22 does not cover the entire length of the residue discharge rod 2, but leaves a section at the bottom of the drilling cylinder 1 which is not occupied by the spiral blade 22, which is a soil core accommodating section 11 of the drilling cylinder 1. The design of the soil core accommodating section 11 allows the soil core to enter and temporarily store in the form of a cylinder during the drilling process. The drill bit 21 is internally provided with an air suction channel r1 and an air injection channel r2. The air suction channel r1 penetrates through the residue discharge rod 2 and forms an air suction hole h1 at the bottom end of the drill bit 21. The air suction hole h1 is usually located at the center of the bottom end of the drill bit 21 and is used to suck in the broken soil residue. The air injection channel r2 is arranged around the air suction channel r1 and forms a plurality of air injection holes h2 on the peripheral wall of the drill bit 21. The air injection holes h2 are located higher than the air suction hole h1 and are uniformly distributed in the circumferential direction to provide uniform air flow impact. In the working process, the drilling cylinder 1 is driven to rotate, and its bottom end drills into the ground to form a pile hole, while the soil core is extruded into the soil core accommodating section 11. The residue discharge rod 2 is driven to rotate, driving the drill bit 21 to break the top of the soil core. The air suction hole h1 generates negative pressure by connecting to an external air suction device such as a vacuum pump, sucking in part of the soil residue broken by the drill bit 21, thereby forming a cavity inside the soil core and reducing the density of the soil core. The air injection holes h2 are connected to an external high-pressure gas source to inject high-pressure gas, and the air flow impacts the soil core in the circumferential direction, further loosening the soil core structure. Subsequently, the spiral blade 22 continuously discharges the loosened soil core upward to the ground under the rotating action of the residue discharge rod 2.
[0025] The piling assembly of the present embodiment can effectively solve the problem of difficulty in feeding the soil core into the bottom end of the conventional screw blade 22. Specifically, the suction hole h1 not only reduces the solid part of the soil core, but also creates internal voids, making the soil core loose; the high-pressure gas impact of the jet hole h2 disintegrates the cohesion of the soil core from the outside, and the two work together to significantly reduce the ramming degree of the soil core, making it easier for the screw blade 22 to grab and lift the soil core, which not only improves the efficiency of the soil core and reduces the risk of locked-rotor, but also improves the overall piling speed, especially suitable for hard soil or clay and other difficult geological conditions. In addition, due to the smooth discharge of the soil core, the wear of the piling assembly is also reduced, prolonging the service life.
[0026] In the present embodiment, based on the consideration of further breaking the soil core, a plurality of scrapers 3 are arranged in the soil core accommodating section 11 in the circumferential direction, each scraper 3 having a sharp soil scraping edge 31. The number of scrapers 3 can be adjusted according to the diameter of the drilling barrel 1, for example, for a larger diameter drilling barrel 1, 4-6 scrapers 3 can be provided to ensure uniform coverage. The scraper 3 is made of wear-resistant steel, and the soil scraping edge 31 is heat treated to enhance hardness. When the soil core enters the soil core accommodating section 11, under the rotation of the drilling barrel 1, the soil scraping edge 31 continuously cuts the outer layer of the soil core, breaking the large soil core into smaller pieces. The arrangement of the scraper 3 and the soil scraping edge 31 allows the soil core to be pretreated by the scraper 3 before entering the action area of the screw blade 22, and the breaking degree is improved. The breaking action of the soil scraping edge 31 reduces the overall size of the soil core, so that the screw blade 22 has less resistance when discharging the soil core, and the feeding process is more smooth, further improving the discharge efficiency. At the same time, the scraper 3 can also prevent the soil core from sticking or blocking in the soil core accommodating section 11, ensuring the continuity of the piling process.
[0027] In this embodiment, in order to further improve the breaking effect of the scraper 3, the scraper 3 is arranged inside the soil core accommodating section 11 at a position suitable for the soil scraping edge 31 to face the jet range of the air jet hole h2. Specifically, the high-pressure gas jetted out of the air jet hole h2 forms a conical or fan-shaped airflow area, and the position of the scraper 3 is set to ensure that the soil scraping edge 31 is located within the coverage range of the airflow area. For example, the central axis of the air jet hole h2 is approximately aligned with the orientation of the soil scraping edge 31, or the scraper 3 is installed directly above or laterally to the air jet hole h2, so that the airflow directly impacts the soil core in front of the soil scraping edge 31. When high-pressure gas is jetted out of the air jet hole h2, the airflow first impacts the surface of the soil core, partially loosens the soil core and produces fine soil debris; these soil debris carried by the airflow are then guided to the soil scraping edge 31, and under the boost of the high-speed airflow, the soil debris hits the soil scraping edge 31 with higher kinetic energy, thereby enhancing the cutting efficiency of the soil scraping edge 31, in addition, the impact of the high-pressure gas on the soil core itself can also pre-soften the soil, making it easier for the soil scraping edge 31 to cut in. This synergistic mechanism not only utilizes mechanical breaking, but also combines pneumatic assistance, making the breaking effect of the scraper 3 multiplied, especially for hard or sticky soil, which can effectively prevent the soil core from caking and ensure uniform loosening of the soil core.
[0028] In this embodiment, in order to further improve the breaking effect of the soil scraping edge 31, a plurality of spaced-apart blade grooves 311 are provided on the soil scraping edge 31. The blade groove 311 is a groove or notch machined on the cutting edge of the soil scraping edge 31, which can be a sawtooth, wavy or rectangular groove, uniformly distributed on the entire length of the soil scraping edge 31. The size and spacing of the blade groove 311 can be optimized according to the soil properties, for example, for clay, the blade groove 311 can be shallow and dense, and for sandy soil, the blade groove 311 can be deep and sparse. When the soil scraping edge 31 comes into contact with the soil core, the presence of the blade groove 311 makes the cutting edge no longer a continuous straight line, but forms a plurality of discrete cutting points, each of which concentrates stress, thereby more easily cutting into the soil core and making the soil core more easily broken. At the same time, the blade groove 311 can also generate additional turbulence and vibration during cutting, further disrupting the soil core structure. Compared with a smooth cutting edge, the soil scraping edge 31 with blade grooves 311 reduces the contact area with the soil core and reduces the frictional resistance, making the breaking process more efficient. In addition, the blade groove 311 also helps to discharge the soil debris generated by cutting, preventing the cutting edge from being blocked and maintaining the continuous working ability of the scraper 3.
[0029] In this embodiment, the scraper 3 is rotatably arranged on the inner wall of the soil core accommodating section 11 based on the consideration of reducing resistance and adapting to the condition of the soil core. The scraper 3 is provided with an elastic member 32 for driving the scraper 3 to maintain an initial position, such as being perpendicular to the inner wall, when not under force. When the soil core enters the soil core accommodating section 11 and presses the scraper 3, the scraper 3 will be subjected to radial pressure from the soil core, thereby being forced to rotate towards the inner wall of the soil core accommodating section 11 and compressing the elastic member 32. The rotation amplitude depends on the tamping degree of the soil core: if the soil core is harder, the pressing degree is greater, the scraper 3 rotates at a larger angle, and is closer to the inner wall, thereby reducing the frontal impact with the soil core to reduce resistance; if the soil core is softer, the pressing degree is smaller, the scraper 3 rotates at a smaller angle, so as to fully play a crushing role; the elastic member 32 provides a restoring force to drive the scraper 3 to reset when the soil core pressure decreases. This arrangement not only plays a crushing role, but also plays a stirring role on the loosened soil core. During rotation, the scraper 3 constantly pushes the soil core, so that the soil core particles are redistributed, avoiding local accumulation, thereby further reducing the difficulty of feeding the soil core into the bottom end of the spiral blade 22. At the same time, the self-adaptive rotation mechanism reduces the wear and energy consumption of the scraper 3, and improves the adaptability of the piling assembly under variable geological conditions.
[0030] In this embodiment, the scraper 3 is rotatably arranged on the inner wall of the soil core accommodating section 11 based on the consideration of reducing resistance and adapting to the condition of the soil core. The scraper 3 is provided with an elastic member 32 for driving the scraper 3 to maintain an initial position, such as being perpendicular to the inner wall, when not under force. When the soil core enters the soil core accommodating section 11 and presses the scraper 3, the scraper 3 will be subjected to radial pressure from the soil core, thereby being forced to rotate towards the inner wall of the soil core accommodating section 11 and compressing the elastic member 32. The rotation amplitude depends on the tamping degree of the soil core: if the soil core is harder, the pressing degree is greater, the scraper 3 rotates at a larger angle, and is closer to the inner wall, thereby reducing the frontal impact with the soil core to reduce resistance; if the soil core is softer, the pressing degree is smaller, the scraper 3 rotates at a smaller angle, so as to fully play a crushing role; the elastic member 32 provides a restoring force to drive the scraper 3 to reset when the soil core pressure decreases. This arrangement not only plays a crushing role, but also plays a stirring role on the loosened soil core. During rotation, the scraper 3 constantly pushes the soil core, so that the soil core particles are redistributed, avoiding local accumulation, thereby further reducing the difficulty of feeding the soil core into the bottom end of the spiral blade 22. At the same time, the self-adaptive rotation mechanism reduces the wear and energy consumption of the scraper 3, and improves the adaptability of the piling assembly under variable geological conditions.
[0031] In this embodiment, the slag discharge rod 2 is provided with an inner pipe 23, which is an elongated pipe concentrically arranged inside the slag discharge rod 2 and is usually made of wear-resistant metal. The space inside the inner pipe 23 forms an air extraction channel r1 for connecting the air extraction hole h1 and the external air extraction equipment; and the annular space between the slag discharge rod 2 and the inner pipe 23 forms a gas injection channel r2 for connecting the gas injection hole h2 and the external high-pressure gas source. This double-channel arrangement integrates the air extraction and gas injection functions, has a compact structure, and avoids the complex arrangement of additional pipelines.
[0032] In the embodiment, in order to improve the drilling effect, the bottom end edge of the drilling cylinder 1 is arranged with a plurality of drill teeth 12 in the circumferential direction, the drill teeth 12 are sharp components made of hard alloy, and are uniformly distributed on the bottom edge of the drilling cylinder 1 by welding or bolt fixing. The shape of the drill teeth 12 can be conical, wedge-shaped or knife-shaped, which is selected according to the geological conditions. When the drilling cylinder 1 rotates, the drill teeth 12 first contact the ground, crush the soil through cutting and grinding, and form a pile hole. The arrangement of the drill teeth 12 improves the drilling efficiency of the drilling cylinder 1, especially for hard strata such as rock or frozen soil, which can reduce the drilling time. At the same time, the drill teeth 12 can also maintain the regularity of the pile hole and prevent the hole wall from collapsing.
[0033] In the embodiment, in order to improve the soil breaking effect of the drill bit 21, the drill bit 21 is conical in structure, the conical drill bit 21 has a sharp top end and a gradually expanding side wall, and such a geometric shape makes the drill bit 21 more easily cut into the soil core when rotating, concentrates stress on the tip, reduces the soil breaking resistance, and the conical structure also helps to guide the soil core to disperse in all directions, avoiding blockage. Compared with the flat drill bit 21, the conical drill bit 21 performs better in hard soil, improving the adaptability of the pile driving assembly.
[0034] Embodiment 2:
[0035] The embodiment shows a walking pile driver, which comprises the pile driving assembly as shown in embodiment 1, and the walking pile driver is a mobile pile driving device with a track or a walking chassis, which is convenient to move on the construction site. The walking type is driven by a double-power engine to drive the drilling cylinder and the residue discharging rod respectively, and the double-power engine and the pile driving assembly are controlled to rise and fall by a slide rail and a traction device. The walking pile driver inherits all the technical solutions of the pile driving assembly, thereby improving the overall pile driving efficiency and being suitable for complex pile foundation construction such as the interlocking pile.
[0036] Finally, it should be noted that: the above implementation cases are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing implementation cases, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing implementation cases, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solutions of the embodiments of the present application.
Claims
1. A pile driving assembly, characterized by The drilling assembly comprises a drilling barrel (1), a discharge rod (2) arranged in the drilling barrel (1), a drill bit (21) formed at the bottom end of the discharge rod (2), and a spiral blade (22) arranged on the outer wall of the discharge rod (2); the drilling barrel (1) has a soil core accommodating section (11) not occupied by the spiral blade (22); the discharge rod (2) is provided with an air suction channel (r1) having an air suction hole (h1) formed at the bottom end of the drill bit (21), and a gas injection channel (r2) having a plurality of gas injection holes (h2) formed in the peripheral wall of the drill bit (21). The drilling barrel (1) is configured to be driven to rotate so that the bottom end drills a pile hole and the soil core enters the soil core accommodating section (11); the discharge rod (2) is configured to be driven to rotate so that the drill bit (21) breaks the soil core, the air suction hole (h1) sucks part of the soil residue, the gas injection hole (h2) circumferentially injects high-pressure gas to loosen the soil core, and the spiral blade (22) continuously discharges the loosened soil core upward.
2. A pile driving assembly according to claim 1, characterized in that A plurality of scrapers (3) are arranged in the soil core accommodating section (11) in a circumferential direction.
3. A pile driving assembly according to claim 2, characterized in that The scraper (3) is arranged in the soil core accommodating section (11) so that the soil scraping edge (31) faces the gas injection range of the gas injection hole.
4. A pile driving assembly according to claim 3, characterized in that The soil scraping edge (31) is provided with a plurality of blade grooves (311) arranged at intervals.
5. A pile driving assembly according to claim 3, characterized in that The scraper (3) is rotatably arranged on the inner wall of the soil core accommodating section (11) so that the scraper (3) is pressed by the soil core to rotate towards the inner wall of the soil core accommodating section (11), and the scraper (3) is provided with an elastic member (32) to drive it to rotate back to the original position.
6. A pile driving assembly according to claim 5, characterized in that The inner wall of the soil core accommodating section (11) is provided with a base frame (33) corresponding to the position of the scraper (3), the base frame (33) is provided with a rotating shaft (34) as the rotating axis of the scraper (3); the side of the scraper (3) away from the soil scraping edge (31) is rotatably sleeved on the rotating shaft (34), and the elastic member (32) is a torsional spring sleeved on the rotating shaft (34), one end of which acts on the scraper (3) and the other end acts on the base frame (33).
7. A pile driving assembly according to any of claims 1-6, characterized in that, The discharge rod (2) is provided with an inner tube (23), the space in the inner tube (23) forms the air suction channel (r1), and the space between the discharge rod (2) and the inner tube (23) forms the gas injection channel (r2).
8. A pile driving assembly according to any one of claims 1-6, characterized in that The bottom end edge of the drilling barrel (1) is circumferentially provided with a plurality of drill teeth (12).
9. A pile driving assembly according to any of claims 1-6, characterized in that, The drill bit (21) is in a conical structure.
10. A walking pile driver, characterized in that The drilling assembly comprises any one of claims 1-9.