A drilling pile air-lifting reverse circulation method hole cleaning mechanism

Abstract

This utility model relates to the field of borehole cleaning technology for bored piles, and more particularly to a borehole cleaning mechanism using an air-lift reverse circulation method. The technical solution includes drilling, and a guide tube disposed inside the borehole. A first air pipe is disposed inside the guide tube, with its lower end connected to the guide tube and an air pump disposed at its upper end. A connecting pipe is disposed at the upper end of the guide tube, with a desander connected to one end. A slurry outlet pipe is connected to the output end of the desander and extends into the borehole. A second air pipe is disposed through the outer wall of the guide tube, with one end connected to the first air pipe and the other end threadedly connected to a nozzle. A mixing component for agitating air and mud is fixedly sleeved on the outer wall of the guide tube. This utility model enables airflow-driven mechanical agitation, further breaking down and refining air bubbles in the mud and dispersing them evenly, promoting full contact and reaction between the gas and liquid phases, increasing mud agitation, and improving borehole cleaning efficiency.

Description

Technical Field

[0001] This utility model relates to the field of borehole cleaning technology for bored piles, and in particular to a borehole cleaning mechanism using the air-lift reverse circulation method for bored piles. Background Technology

[0002] Hole cleaning is a crucial step in bored pile construction, and its role extends far beyond simply removing sediment. It effectively reduces the adverse effects of sediment at the pile bottom on the pile's load-bearing capacity, ensuring a good bond between the pile and the foundation, thereby improving the pile's bearing capacity and durability. If cleaning is incomplete, sediment can form a weak interlayer at the pile bottom, leading to uneven settlement under load, and in severe cases, even causing engineering accidents. Common methods for cleaning bored piles include forward circulation and reverse circulation cleaning, among which air-lift reverse circulation is preferred due to its high cleaning efficiency and wide applicability. However, existing air-lift reverse circulation cleaning mechanisms typically inject air directly into the guide tube or bottom of the hole via a single-path air pipe. This concentrated injection point causes air to easily form locally aggregated air bubbles upon entering the drilling mud, making it difficult for them to quickly diffuse into the surrounding mud. This limits the contact area between air and mud, resulting in poor initial mixing and insufficient air-mud mixing, leading to low cleaning efficiency. Therefore, this utility model proposes a hole cleaning mechanism for bored piles using the air-lift reverse circulation method. Utility Model Content

[0003] The purpose of this invention is to address the problems existing in the background technology by proposing a hole-cleaning mechanism for air-lift reverse circulation in bored piles.

[0004] The technical solution of this utility model is as follows: a borehole cleaning mechanism using air lift reverse circulation, comprising a borehole and further comprising: a guide tube disposed inside the borehole, wherein a first air pipe is disposed inside the guide tube, the lower end of the first air pipe is connected to the guide tube, and an air pump is disposed at the upper end of the first air pipe; a connecting pipe disposed at the upper end of the guide tube, one end of the connecting pipe being connected to a desander, the output end of the desander being connected to a slurry outlet pipe, one end of the slurry outlet pipe extending into the interior of the borehole; a second air pipe penetrating the outer wall of the guide tube, one end of the second air pipe being connected to the first air pipe, and the other end of the second air pipe being threadedly connected to a nozzle; and a mixing component for mixing air and mud is fixedly sleeved on the outer wall of the guide tube.

[0005] Optionally, the mixing assembly includes a fixed sleeve that is fixedly fitted onto the outer wall of the lower end of the conduit. Limiting rings are fixedly provided at both ends of the fixed sleeve. A movable sleeve is movably fitted onto the outer wall of the fixed sleeve, and the movable sleeve is located between the limiting rings. Multiple stirring blades are fixedly connected to the outer wall of the movable sleeve.

[0006] Optionally, the upper end of the catheter is connected to a three-way tube, one end of which is connected to the first trachea, and the other end of which is connected to a connecting tube.

[0007] Optionally, a base plate is provided at the end of the drill hole, the base plate passes through the guide tube, and a plurality of support rods are fixedly provided on the upper surface of the base plate. A fixing collar is fixedly connected to the upper end of the support rod, and the fixing collar is fixedly sleeved with the guide tube.

[0008] Optionally, the nozzle is inclined and the nozzle is directed toward the stirring blade.

[0009] Optionally, a support collar is fixedly sleeved on the outer wall of the first trachea, and the support collar is fixedly connected to the inner wall of the duct.

[0010] In summary, this application includes at least one of the following beneficial technical effects:

[0011] This invention achieves lateral airflow impact on the outside of the duct by setting a second air pipe and an inclined nozzle on the outer wall of the duct and pointing the nozzle toward the stirring blade. This forces the mud to generate local vortices, significantly expands the diffusion range of air in the mud, greatly increases the gas-liquid contact area, and effectively improves the initial mixing effect of air and mud.

[0012] Furthermore, this utility model achieves mechanical stirring under airflow drive through a mixing assembly consisting of a fixed sleeve, a limiting ring, a movable sleeve, and stirring blades. This allows bubbles to be further broken down, refined, and evenly dispersed in the mud, promoting full contact and reaction between the gas and liquid phases, significantly enhancing the mud's agitation level, and substantially improving the hole cleaning efficiency. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of a hole-cleaning mechanism for a bored pile using the air-lift reverse circulation method.

[0014] Figure 2 for Figure 1 Schematic diagram of the structure of the hybrid component;

[0015] Figure 3 for Figure 1 Enlarged structural diagram at point A in the middle.

[0016] Figure label:

[0017] 1. Drilling hole; 2. Conduit pipe; 3. First air pipe; 4. Air pump; 5. Connecting pipe; 6. Sand remover; 7. Slurry outlet pipe; 8. Second air pipe; 9. Nozzle;

[0018] 10. Mixing component; 101. Fixed sleeve; 102. Limiting ring; 103. Movable sleeve; 104. Stirring blade;

[0019] 11. Tee; 12. Base plate; 13. Support rod; 14. Fixing collar; 15. Support collar. Detailed Implementation

[0020] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.

[0021] The components of the present invention embodiments described and shown in the accompanying drawings can typically be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention.

[0022] Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0023] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0024] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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 utility model based on the specific circumstances.

[0025] Example

[0026] like Figure 1 and Figure 3As shown, the present invention proposes a borehole cleaning mechanism using air lift reverse circulation, which includes a borehole 1 and a conduit 2 disposed inside the borehole 1. The conduit 2 facilitates the transmission of a mixture of air bubbles and mud. A first air pipe 3 is disposed inside the conduit 2. A support collar 15 is fixedly sleeved on the outer wall of the first air pipe 3. The support collar 15 is fixedly connected to the inner wall of the conduit 2, which enables the first air pipe 3 to be stably installed inside the conduit 2. The lower end of the first air pipe 3 is connected to the conduit 2. An air pump 4 is disposed at the upper end of the first air pipe 3, and the air pump 4 provides an air source for the first air pipe 3, thereby generating air bubbles from the gas output inside the borehole 1.

[0027] Furthermore, the upper end of the guide pipe 2 is connected to a connecting pipe 5, and one end of the connecting pipe 5 is connected to a desander 6. The desander 6 is existing technology and can remove sand from the impurities in the mud. It will not be described in detail here. The output end of the desander 6 is connected to a slurry outlet pipe 7. One end of the slurry outlet pipe 7 extends into the interior of the borehole 1 and can discharge the filtered mud and sand back into the interior of the borehole 1.

[0028] Secondly, a second air pipe 8 is installed through the outer wall of the conduit 2. One end of the second air pipe 8 is connected to the first air pipe 3, and the other end of the second air pipe 8 is threadedly connected to a nozzle 9. The nozzle 9 is inclined and the nozzle is facing the stirring blade 104, which can push the stirring blade 104 to stir the contact between the air bubbles and the mud, so that the mixing is more thorough and uniform.

[0029] like Figure 2 and Figure 3 As shown, a mixing component 10 for mixing air and mud is fixedly sleeved on the outer wall of the conduit 2. The mixing component 10 includes a fixed sleeve 101 fixedly sleeved on the lower outer wall of the conduit 2. Limiting rings 102 are fixedly installed at both ends of the fixed sleeve 101, and the fixed sleeve 101 and the limiting rings 102 are integrally formed. A movable sleeve 103 is movably sleeved on the outer wall of the fixed sleeve 101, and the movable sleeve 103 is located between the limiting rings 102. The limiting rings 102 can limit the movable sleeve 103, so that it can rotate stably on the outer wall of the fixed sleeve 101. Multiple stirring blades 104 are fixedly connected to the outer wall of the movable sleeve 103, which can drive the multiple stirring blades 104 to rotate stably, thereby agitating the air bubbles and mud to fully contact each other.

[0030] In addition, a three-way tube 11 is connected to the upper end of the conduit 2. One end of the three-way tube 11 is connected to the first trachea 3, and the other end of the three-way tube 11 is connected to the connecting tube 5 to ensure the stability of the pipe connection.

[0031] Furthermore, a base plate 12 is provided at the end of the borehole 1, and the base plate 12 passes through the guide tube 2. Multiple support rods 13 are fixedly provided on the upper surface of the base plate 12. A fixing collar 14 is fixedly connected to the upper end of the support rod 13. The fixing collar 14 is fixedly sleeved with the guide tube 2, which can provide stable support for the guide tube 2 and prevent it from shaking during hole cleaning.

[0032] The working principle of this embodiment is as follows: When using the borehole cleaning mechanism of air lift reverse circulation method for borehole piles, the guide tube 2 is first vertically placed into the borehole 1. The guide tube 2 is stably supported by the support rod 13 and the fixing collar 14 on the base plate 12 to ensure that it will not shake during the cleaning process.

[0033] After the air pump 4 is started, the high-pressure air is divided into two paths through the first air pipe 3: one path enters the inside of the guide tube 2 through the three-way pipe 11, mixes with the mud in the borehole 1 to form a gas-liquid mixture, and rises along the guide tube 2 under the action of reverse circulation, and enters the desander 6 through the connecting pipe 5; the other path is delivered to the inclined nozzle 9 through the second air pipe 8. At this time, the lateral airflow ejected from the nozzle 9 directly impacts the stirring blade 104, causing the movable sleeve 103 to rotate between the fixed sleeve 101 and the limiting ring 102.

[0034] As the movable sleeve 103 rotates, the stirring blades 104 violently agitate the mud around the outer wall of the guide tube 2. At the same time, the airflow ejected from the nozzle 9 forms local vortices in the mud, significantly expanding the contact range between the air and the mud. Under the dual action of mechanical stirring and airflow disturbance of the mixing component 10, the bubbles are broken down and refined and evenly dispersed in the mud, significantly improving the gas-liquid mixing efficiency.

[0035] The clean mud, after the sand particles are separated by the desander 6, flows back into the borehole 1 through the slurry outlet pipe 7 to participate in the borehole cleaning cycle again. During this process, the support ring 15 on the outer wall of the first air pipe 3 ensures the stability of the air pipe under high-speed airflow, while the entire borehole cleaning system quickly carries the sediment in the borehole 1 to the ground through continuous airlift reverse circulation and enhanced mixing, achieving efficient borehole cleaning.

[0036] The above specific embodiments are merely optional embodiments of this utility model. Based on the technical solution of this utility model and the relevant teachings of the above embodiments, those skilled in the art can make various alternative improvements and combinations to the above specific embodiments.

Claims

1. A borehole pile air-lifting reverse circulation method hole cleaning mechanism, comprising a borehole (1), characterized in that, Also includes: A conduit (2) is installed inside the borehole (1). A first air pipe (3) is installed inside the conduit (2). The lower end of the first air pipe (3) is connected to the conduit (2). An air pump (4) is installed at the upper end of the first air pipe (3). A connecting pipe (5) is provided at the upper end of the guide pipe (2). One end of the connecting pipe (5) is connected to a sand remover (6). The output end of the sand remover (6) is connected to a slurry outlet pipe (7). One end of the slurry outlet pipe (7) extends into the interior of the borehole (1). A second air tube (8) is installed through the outer wall of the conduit (2). One end of the second air tube (8) is connected to the first air tube (3), and the other end of the second air tube (8) is threaded with a nozzle (9). A mixing assembly (10) for mixing air and mud is fixedly sleeved on the outer wall of the conduit (2).

2. The hole cleaning mechanism of claim 1, wherein, The mixing component (10) includes a fixed sleeve (101) fixedly sleeved on the outer wall of the lower end of the conduit (2). Limiting rings (102) are fixedly provided at both ends of the fixed sleeve (101). A movable sleeve (103) is movably sleeved on the outer wall of the fixed sleeve (101), and the movable sleeve (103) is located between the limiting rings (102). A plurality of stirring blades (104) are fixedly connected to the outer wall of the movable sleeve (103).

3. The hole cleaning mechanism of claim 1, wherein, The upper end of the catheter (2) is connected to a three-way tube (11), one end of which is connected to the first trachea (3), and the other end of which is connected to the connecting tube (5).

4. The hole cleaning mechanism of claim 1, wherein, A base plate (12) is provided at the port of the borehole (1). The base plate (12) passes through the guide tube (2). Multiple support rods (13) are fixedly provided on the upper surface of the base plate (12). A fixing collar (14) is fixedly connected to the upper end of the support rod (13). The fixing collar (14) is fixedly sleeved with the guide tube (2).

5. The gas lift reverse circulation hole cleaning mechanism for a drilled pile according to claim 2, wherein, The nozzle (9) is inclined and the nozzle is directed toward the stirring blade (104).

6. A borehole cleaning mechanism for air-lift reverse circulation method for bored piles according to claim 1, characterized in that, The outer wall of the first trachea (3) is fixedly fitted with a support collar (15), and the support collar (15) is fixedly connected to the inner wall of the conduit (2).

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