Hole cleaning device and hole cleaning method

Abstract

The invention discloses a hole cleaning device and a hole cleaning method.The hole cleaning device comprises an air guide pipe and a collecting hopper, the air guide pipe is provided with a first end and a second end, the first end is provided with an air inlet used for being connected with air supply equipment, and the collecting hopper is arranged between the first end and the second end of the air guide pipe and connected with the air guide pipe; the second end is provided with an air outlet deviating from the collecting hopper, and the collecting hopper is provided with a collecting opening deviating from the air outlet; and the cross section of the collecting hopper is smaller than that of the pile foundation hole, so that a hole cleaning channel is formed between the outer side wall of the collecting hopper and the hole wall of the pile foundation hole when the collecting hopper is placed into the pile foundation hole. According to the hole cleaning device provided by the embodiment of the invention, air flow is used for blowing up floating soil, gravel and other floating residues falling from the bottom of the pile foundation hole, and then the collecting hopper is used for collecting the lifted floating residues, so that a better hole cleaning effect can be achieved, and the hole cleaning efficiency is higher.

Description

Technical Field

[0001] This invention relates to the technical field of hole cleaning equipment, and specifically to a hole cleaning device and a hole cleaning method. Background Technology

[0002] During the construction of photovoltaic (PV) pile foundations, factors such as steep slopes and the presence of soft soil layers can cause mechanical disturbances that lead to debris falling into the pile foundation. After drilling, sediment (including soil, gravel, and mud mixtures) may remain at the bottom of the hole, potentially causing hole collapse. If the hole is not thoroughly cleaned before pouring the pile foundation, the sediment will reduce the effective bearing area, skin friction, and lateral restraint of the pile foundation, resulting in insufficient shear, tensile, and compressive strength, seriously threatening the structural safety and long-term operational stability of the PV power station.

[0003] In related technologies, there are two main methods for cleaning photovoltaic pile foundations. One method is to manually use tools such as shovels to dig out loose soil and gravel. This method is inefficient and costly, and because the pile foundation is a long and narrow structure, it is impossible to effectively clean the sediment at the bottom. The other method is to use equipment such as auger drills or spiral drills to lift the soil out of the hole by rotating the spiral blades or to achieve the purpose of cleaning the hole by secondary drilling. However, because the spiral cleaning and mechanical movement process causes great disturbance to the pile foundation, it is easy to cause secondary collapse of the hole. Summary of the Invention

[0004] The present invention aims to at least partially solve one of the technical problems in the related art.

[0005] Therefore, embodiments of the present invention propose a hole cleaning device that uses airflow to blow up loose soil, gravel, and other scum that have fallen from the bottom of the pile foundation hole, and then uses a collection bucket to collect the lifted scum, which can achieve a better hole cleaning effect and higher hole cleaning efficiency.

[0006] The hole cleaning device of this invention includes an air guide pipe and a collection hopper. The air guide pipe has a first end and a second end. The first end has an air inlet for connecting to an air supply device. The collection hopper is disposed between the first end and the second end of the air guide pipe and connected to the air guide pipe. The second end has an air outlet arranged away from the collection hopper. The collection hopper has a collection port arranged away from the air outlet. The cross-section of the collection hopper is smaller than the cross-section of the pile hole, so that a hole cleaning channel is formed between the outer wall of the collection hopper and the hole wall of the pile hole when the collection hopper is placed into the pile hole.

[0007] In some embodiments, the collecting hopper has a bottom wall arranged opposite to the collecting port, the air guide tube passes through the bottom wall of the collecting hopper, and the centerline of the air guide tube coincides with the centerline of the collecting hopper.

[0008] In some embodiments, the air duct includes an air outlet section having the air outlet, and the cross-section of the air outlet section gradually decreases along the direction from the first end to the second end.

[0009] In some embodiments, the outer wall of the collecting hopper is conical, and the cross-section of the outer wall of the collecting hopper gradually decreases along the direction from the first end to the second end.

[0010] In some embodiments, the length of the air duct is greater than the depth of the pile foundation hole.

[0011] In some embodiments, the outer wall of the air guide tube has scale lines arranged along the length of the air guide tube.

[0012] In some embodiments, the cleaning device further includes a support assembly, which includes a connector, a first support rod, and a second support rod. One end of the first support rod is hinged to the air guide tube, and the other end of the first support rod is hinged to one end of the second support rod. The other end of the second support rod is hinged to the connector. The connector is slidably connected to the air guide tube so that the distance between the other end of the first support rod and the air guide tube can be adjusted by controlling the sliding of the connector.

[0013] In some embodiments, the number of the support assemblies is multiple, and the multiple support assemblies are arranged at circumferential intervals along the air duct.

[0014] In some embodiments, the connector is a connecting cylinder slidably fitted onto the air guide tube, and the other ends of at least two second support rods are connected to the connecting cylinder; the support assembly further includes a locking bolt that passes through the connecting cylinder and is threadedly engaged with the connecting cylinder, and the locking bolt has a stop end for abutting against the outer wall of the air guide tube.

[0015] The hole cleaning method of this invention uses the hole cleaning device described in any of the above embodiments, and the hole cleaning method includes the following steps:

[0016] The collection bucket is placed into the pile hole to be cleaned using the air guide pipe, so that the air outlet of the air guide pipe faces the bottom of the pile hole, and a cleaning channel is formed between the outer wall of the collection bucket and the hole wall of the pile hole.

[0017] Gas is injected into the air guide pipe through the air inlet, and the gas is ejected from the air outlet to make the scum at the bottom of the hole rise and rise to the upper side of the collection hopper through the cleaning channel, and then fall into the collection hopper through the collection port.

[0018] The hole cleaning device of this invention uses airflow to blow up loose soil, gravel, and other scum that have fallen from the bottom of the pile foundation hole, and then uses a collection bucket to collect the lifted scum. This achieves a good hole cleaning effect, is simple to operate, and is highly practical. Compared with the manual hole cleaning method in related technologies, it has higher cleaning efficiency and lower cost. Compared with the hole cleaning method in related technologies that uses equipment such as auger drills, the hole cleaning device of this invention causes less disturbance to the hole wall of the pile foundation hole, and can significantly reduce the risk of secondary hole collapse while completing the hole cleaning operation. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of a hole-cleaning device according to an embodiment of the present invention.

[0020] Figure 2 This is a schematic diagram of the air guide tube of a hole cleaning device according to an embodiment of the present invention.

[0021] Reference numerals: 100, Hole cleaning device; 1, Air guide pipe; 11, Air inlet; 12, Air outlet; 13, Air outlet section; 14, Scale line; 2, Collection hopper; 21, Collection port; 22, Hole cleaning channel; 3, Air compressor; 4, Support assembly; 41, First support rod; 42, Second support rod; 43, Connecting cylinder; 431, Locking bolt; 44, Fixing cylinder; 45, Support point; 200, Pile foundation hole. Detailed Implementation

[0022] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0023] like Figure 1 As shown, the hole cleaning device 100 of this embodiment of the invention is suitable for cleaning pile foundation holes 200. The hole cleaning device 100 includes an air guide pipe 1 and a collection hopper 2. The air guide pipe 1 has a first end and a second end. The first end has an air inlet 11 for connecting to an air supply device. The collection hopper 2 is located between the first end and the second end of the air guide pipe 1 and is connected to the air guide pipe 1. The second end has an air outlet 12 arranged away from the collection hopper 2. The collection hopper 2 has a collection port 21 arranged away from the air outlet 12. The cross-section of the collection hopper 2 is smaller than the cross-section of the pile foundation hole 200 so that when the collection hopper 2 is placed into the pile foundation hole 200, a hole cleaning channel 22 is formed between the outer wall of the collection hopper 2 and the hole wall of the pile foundation hole 200.

[0024] In this embodiment of the invention, the hole cleaning device 100, during hole cleaning operations, firstly uses the air guide pipe 1 to place the collecting hopper 2 into the pile foundation hole 200 to be cleaned, with the air outlet 12 of the air guide pipe 1 facing the bottom of the pile foundation hole 200, and the collecting opening 21 of the collecting hopper 2 facing upwards. A hole cleaning channel 22 is formed between the outer wall of the collecting hopper 2 and the hole wall of the pile foundation hole 200. Then, gas is injected into the air guide pipe 1 through the air inlet 11, and the airflow is ejected from the air outlet 12 to make the scum at the bottom of the hole rise. After contacting the bottom of the pile foundation hole 200, part of the airflow is reversed upwards, carrying the rising scum through the hole cleaning channel 22 to the upper side of the collecting hopper 2, and then falling into the collecting hopper 2 from the collecting opening 21, thereby realizing the hole cleaning operation. When there is a lot of scum in the pile foundation hole 200, the cleaning can be carried out in multiple stages.

[0025] The hole cleaning device 100 of this invention uses airflow to blow up loose soil, gravel, and other scum that have fallen from the bottom of the pile foundation hole 200, and then uses a collection bucket 2 to collect the lifted scum. This achieves a good hole cleaning effect, is simple to operate, and is highly practical. Compared with the manual hole cleaning method in related technologies, the hole cleaning efficiency is higher and the cost is lower. Compared with the hole cleaning method in related technologies that uses equipment such as auger drills, the hole cleaning device 100 of this invention causes less disturbance to the hole wall of the pile foundation hole 200, and can significantly reduce the risk of secondary hole collapse while completing the hole cleaning operation.

[0026] Specifically, such as Figure 1 As shown, the hole cleaning device 100 also includes an air compressor 3, which is a portable air compressor with an air output of 100L / min. The collection bucket 2 is placed into the pile hole 200 to be cleaned using the air guide pipe 1. The first end of the air guide pipe 1 is located on the upper side and the second end is located on the lower side. The air compressor 3 is connected to the air inlet 11 at the first end through a pipe. The air compressor 3 can inject air into the air guide pipe 1 to carry out the hole cleaning operation. The portable air compressor 3 makes it easier to move the hole cleaning device 100, making the hole cleaning device 100 more adaptable to different terrains.

[0027] In some embodiments, such as Figure 1 As shown, the collecting hopper 2 has a bottom wall arranged opposite to the collecting port 21, and the air guide pipe 1 passes through the bottom wall of the collecting hopper 2, with the center line of the air guide pipe 1 coinciding with the center line of the collecting hopper 2.

[0028] The air guide pipe 1 and the collection hopper 2 are arranged with their centers overlapping, which can improve the stability of the collection hopper 2 during the hole cleaning process. In addition, placing the air guide pipe 1 at the center of the pile hole 200 can form a hole cleaning channel 22 around the collection hopper 2 between the outer wall of the collection hopper 2 and the hole wall of the pile hole 200. The air outlet 12 of the air guide pipe 1 sprays out and raises the scum. The raised scum is then carried upward by the backflow airflow, and is raised upward through the hole cleaning channel 22 to the perimeter of the collection port 21 and falls into the collection hopper 2, thereby improving the hole cleaning efficiency.

[0029] In some embodiments, such as Figure 2 As shown, the air duct 1 includes an air outlet section 13, which has the aforementioned air outlet 12. The cross-section of the air outlet section 13 gradually decreases from the first end to the second end.

[0030] Gas is injected into the air guide pipe 1 through the air inlet 11. Then the airflow is transported from the first end to the second end of the air guide pipe 1. When the airflow passes through the air outlet section 13, the cross-section of the air outlet section 13 gradually narrows, which can accelerate the airflow and make the airflow ejected at high speed through the air outlet 12. The high-speed airflow forms a "jet effect", which can exert a greater lifting force on the scum at the bottom of the pile foundation hole 200, which is more conducive to the cleaning operation of the scum.

[0031] Specifically, such as Figure 2 As shown, the sidewall of the air outlet section 13 is curved and contracts along the direction from the first end to the second end. That is, with the plane passing through the axis of the air guide tube 1 as the projection plane, the projection of the inner sidewall of the air outlet section 13 on the projection plane is a curve. As a result, the speed of the airflow ejected from the air outlet 12 can be further increased while improving the stability of the airflow.

[0032] In some embodiments, such as Figure 1 As shown, the outer wall of the collecting hopper 2 is conical, and the cross-section of the outer wall of the collecting hopper 2 gradually decreases from the first end to the second end.

[0033] With the above setup, the collection hopper 2 is placed into the pile hole 200 to be cleaned. The collection hopper 2 and the outer wall of the pile hole 200 form a cleaning channel 22. The outer wall of the collection hopper 2 gradually contracts from top to bottom, and the cleaning channel 22 gradually contracts from bottom to top. As a result, when the airflow backflowing from the bottom of the pile hole 200 carries the scum that is raised through the cleaning channel 22, the cleaning channel 22 can accelerate the airflow, so that the scum passes through the cleaning channel 22 faster. After the airflow passes through the cleaning channel 22, it quickly disperses and its speed decreases. The scum it carries quickly disperses and falls into the collection hopper 2 under the action of gravity, thereby realizing the collection of scum.

[0034] Specifically, the collecting hopper 2 has two ends arranged along its axial direction, and the collecting port 21 and the bottom wall of the collecting hopper 2 are respectively located at the two ends of the collecting hopper 2. The collecting port 21 is closer to the first end of the air guide pipe 1 than the bottom wall of the collecting hopper 2. Figure 1 As shown, the air guide pipe 1 and the collection hopper 2 are placed inside the pile foundation hole 200, with the collection port 21 facing upwards.

[0035] The outer diameter of the upper end of the collecting bucket 2 is smaller than the diameter of the pile foundation hole 200, and the difference between the two is 25mm to 35mm, preferably 30mm; the length of the collecting bucket 2 along its axial direction is 150mm.

[0036] In some embodiments, such as Figure 1 As shown, the length of the air duct 1 is greater than the depth of the pile foundation hole 200.

[0037] Therefore, by using the air guide pipe 1, the collection bucket 2 can be lowered to the bottom of the pile foundation hole 200, which is more conducive to the cleaning operation of the pile foundation hole 200.

[0038] Optionally, the air guide pipe 1 is made of DN30 steel pipe. Therefore, the steel pipe has sufficient strength to support the collection hopper 2. When the collection hopper 2 is placed at the bottom of the pile hole 200, the first end of the air guide pipe 1 is above the ground. The position of the collection hopper 2 can be adjusted through the first end of the air guide pipe 1 so that the center of the collection hopper 2 basically coincides with the center of the pile hole 200. This facilitates the upward movement of loose gravel, loose soil, and other scum through the cleaning channel 22 to the upper side of the collection hopper 2.

[0039] In some embodiments, such as Figure 1 As shown, the outer wall of the air duct 1 has a scale line 14 arranged along the length of the air duct 1, and the scale line 14 is arranged near the first end of the air duct 1.

[0040] The scale line 14 makes the hole cleaning operation visible, so that the operators can know the location of the collection bucket 2 at any time. When the collection bucket 2 reaches the bottom of the hole, it means that the hole cleaning operation of the pile foundation hole 200 is completed. The air pipe 1 and the collection bucket 2 can be taken out, and then the cleaning work of the next pile foundation hole 200 can be carried out.

[0041] In some embodiments, the cleaning device 100 further includes a support assembly 4, which includes a connector, a first support rod 41 and a second support rod 42. One end of the first support rod 41 is hinged to the air guide tube 1, and the other end of the first support rod 41 is hinged to one end of the second support rod 42. The other end of the second support rod 42 is hinged to the connector. The connector is slidably connected to the air guide tube 1 so that the distance between the other end of the first support rod 41 and the air guide tube 1 can be adjusted by controlling the sliding of the connector.

[0042] In some embodiments, there are multiple support assemblies 4, which are arranged at circumferential intervals along the air duct 1.

[0043] In some embodiments, the connector is a connecting cylinder 43, which is slidably fitted onto the air duct 1, and the other ends of at least two second support rods 42 are connected to the connecting cylinder 43; the support assembly 4 also includes a locking bolt 431, which passes through the connecting cylinder 43 and is threadedly engaged with the connecting cylinder 43, and the locking bolt 431 has a stop end for stopping against the outer wall of the air duct 1.

[0044] Specifically, such as Figure 1 As shown, the support assembly 4 is arranged near the first end of the air duct 1. There are two support assemblies 4, which are arranged opposite each other on both sides of the air duct 1. The support assembly 4 also includes a fixing cylinder 44 and a connecting cylinder 43. The fixing cylinder 44 is fitted into the air duct 1 and fixedly connected to it. The connecting cylinder 43 is fitted into the air duct 1 and is equivalent to the air duct 1 being slidable. The fixing cylinder 44 is closer to the first end of the air duct 1 than the connecting cylinder 43. In other words, after the air duct 1 is inserted into the pile hole 200, it is fixed... Cylinder 44 is located above connecting cylinder 43; one end of the first support rod 41 is hinged to the fixed cylinder 44, and the other end is hinged to one end of the second support rod 42, and the other end of the second support rod 42 is hinged to the connecting cylinder 43; one end of multiple first support rods 41 is hinged to the same fixed cylinder 44, and the other end of multiple second support rods 42 is hinged to the same connecting cylinder 43; thus, by sliding the connecting cylinder 43 along the air guide tube 1, the positions of multiple first support rods 41 and second support rods 42 can be adjusted simultaneously, so that the support assembly 4 can extend and retract.

[0045] The locking bolt 431 passes through the connecting cylinder 43 radially and is threaded into the connecting cylinder 43. The end of the locking bolt 431 near the air guide pipe 1 is its stop end. Tightening the locking bolt 431 moves it closer to the air guide pipe 1. When the stop end tightly abuts against the outer wall of the air guide pipe 1, the position of the connecting cylinder 43 can be fixed.

[0046] During the hole cleaning operation, the collecting bucket 2 is placed into the pile foundation hole 200. When the collecting bucket 2 is near the bottom of the hole, part or all of the support assembly 4 can enter the pile foundation hole 200. Before the support assembly 4 enters the pile foundation hole 200, the connecting cylinder 43 is moved towards the fixed cylinder 44, which allows the hinge joint of the first support rod 41 and the second support rod 42 to be opened outward. A support point 45 is formed on the outer side of the hinge joint of the first support rod 41 and the second support rod 42, and the distance between the support point 45 and the center line of the air guide pipe 1 is equal to the radius of the pile foundation hole 200. By adjusting the position of the connecting cylinder 43, the support assembly 4 can adapt to pile foundation holes 200 of different diameters. After the support assembly 4 enters the pile foundation hole 200, the two support assemblies 4 form two support points 45. The two support points 45 simultaneously abut against the hole wall of the pile foundation hole 200, so that the center line of the air guide pipe 1 coincides with the center line of the pile foundation hole 200, that is, the center line of the collecting hopper 2 coincides with the center line of the pile foundation hole 200. This forms a hole cleaning channel 22 that surrounds the collecting hopper 2 between the outer wall of the collecting hopper 2 and the hole wall of the pile foundation hole 200. At the same time, during the hole cleaning operation, the support points 45 supporting the hole wall of the pile foundation hole 200 can increase the stability of the air guide pipe 1 and the collecting hopper 2, so that the collecting hopper 2 remains stable during the hole cleaning process.

[0047] After the hole cleaning operation is completed, the connecting cylinder 43 can be moved away from the fixed cylinder 44, so that the distance between the support point 45 and the air pipe 1 is reduced, which is more conducive to moving the support assembly 4 out of the pile hole 200.

[0048] In addition, the first support rod 41 of the support assembly 4 can be used to assist in the process of placing the collection bucket 2 into and removing the pile foundation hole 200, making the operation more convenient.

[0049] In other embodiments, the number of support components 4 can also be set to two or more, such as three, which can further increase the stability of the collection bucket 2 during the hole cleaning operation.

[0050] The hole cleaning device 100 of this invention consists of a portable air compressor 3, an air duct 1, a collection hopper 2, a support assembly 4, and other components. It has a simple structure and is easy to operate. Only two people are needed to carry out hole cleaning operations. The hole cleaning efficiency can reach an average of 500 holes per person per day. The hole cleaning operation cost is low, the hole cleaning effect is good and the efficiency is high. It can significantly shorten the construction period and improve the engineering quality of photovoltaic pile foundations.

[0051] The hole cleaning method of this invention, using the hole cleaning device 100 described in any of the above embodiments, includes the following steps:

[0052] Using the air guide pipe 1, the collection bucket 2 is placed into the pile hole 200 to be cleaned, so that the air outlet 12 of the air guide pipe 1 faces the bottom of the pile hole 200, and a cleaning channel 22 is formed between the outer wall of the collection bucket 2 and the hole wall of the pile hole 200.

[0053] Gas is injected into the air pipe 1 through the air inlet 11. The gas is ejected from the air outlet 12 to make the scum at the bottom of the hole rise and rise to the upper side of the collection hopper 2 through the cleaning channel 22, and then fall into the collection hopper 2 through the collection port 21.

[0054] The hole cleaning method of this invention uses airflow to blow up the floating soil, gravel and other scum that have fallen from the bottom of the pile foundation hole 200, and then uses the collection bucket 2 to collect the lifted scum. This method can achieve a better hole cleaning effect, is simple to operate, has higher hole cleaning efficiency and lower cost, and causes less disturbance to the hole wall of the pile foundation hole 200. While completing the hole cleaning operation, it can greatly reduce the risk of secondary hole collapse.

[0055] It is understood that the above description of the hole cleaning device 100 also applies to this hole cleaning method, and will not be repeated here.

[0056] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" 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 this invention and simplifying the description, and are not intended to 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 this invention.

[0057] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0058] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0059] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0060] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0061] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A hole cleaning device (100), characterized in that, Suitable for cleaning pile foundation holes (200), the cleaning device (100) includes: The air duct (1) has a first end and a second end, the first end having an air inlet (11) for connecting to an air supply device; A collection hopper (2) is located between the first end and the second end of the air guide pipe (1) and connected to the air guide pipe (1). The second end has an air outlet (12) arranged away from the collection hopper (2). The collection hopper (2) has a collection port (21) arranged away from the air outlet (12). The cross-section of the collecting hopper (2) is smaller than the cross-section of the pile foundation hole (200) so that a cleaning channel (22) is formed between the outer wall of the collecting hopper (2) and the hole wall of the pile foundation hole (200) when the collecting hopper (2) is placed into the pile foundation hole (200).

2. The hole cleaning device (100) according to claim 1, characterized in that, The collecting hopper (2) has a bottom wall arranged opposite to the collecting port (21), and the air guide pipe (1) passes through the bottom wall of the collecting hopper (2), with the center line of the air guide pipe (1) coinciding with the center line of the collecting hopper (2).

3. The hole cleaning device (100) according to claim 2, characterized in that, The air duct (1) includes an air outlet section (13) having the air outlet (12), and the cross-section of the air outlet section (13) gradually decreases along the direction from the first end to the second end.

4. The hole cleaning device (100) according to claim 3, characterized in that, The outer wall of the collecting hopper (2) is conical, and the cross-section of the outer wall of the collecting hopper (2) gradually decreases along the direction from the first end to the second end.

5. The hole cleaning device (100) according to claim 1, characterized in that, The length of the air duct (1) is greater than the depth of the pile foundation hole (200).

6. The hole cleaning device (100) according to claim 5, characterized in that, The outer wall of the air duct (1) has scale lines (14) arranged along the length of the air duct (1).

7. The hole cleaning device (100) according to any one of claims 1-6, characterized in that, The cleaning device (100) further includes a support assembly (4), which includes a connector, a first support rod (41) and a second support rod (42). One end of the first support rod (41) is hinged to the air guide tube (1), and the other end of the first support rod (41) is hinged to one end of the second support rod (42). The other end of the second support rod (42) is hinged to the connector. The connector is slidably connected to the air guide tube (1) so that the distance between the other end of the first support rod (41) and the air guide tube (1) can be adjusted by controlling the sliding of the connector.

8. The hole cleaning device (100) according to claim 7, characterized in that, The number of the support assemblies (4) is multiple, and the multiple support assemblies (4) are arranged at intervals along the circumference of the air duct (1).

9. The hole cleaning device (100) according to claim 8, characterized in that, The connector is a connecting cylinder (43), which is slidably fitted onto the air guide tube (1), and the other ends of at least two second support rods (42) are connected to the connecting cylinder (43); The bracket assembly (4) further includes a locking bolt (431) that passes through the connecting cylinder (43) and is threadedly engaged with the connecting cylinder (43), and the locking bolt (431) has a stop end for abutting against the outer wall of the air guide tube (1).

10. A method for cleaning holes, characterized in that, The hole cleaning apparatus (100) according to any one of claims 1-9, the hole cleaning method includes the following steps: Using the air guide pipe (1), the collection bucket (2) is placed into the pile foundation hole (200) to be cleaned, so that the air outlet (12) of the air guide pipe (1) faces the bottom of the pile foundation hole (200), and a cleaning channel (22) is formed between the outer wall of the collection bucket (2) and the hole wall of the pile foundation hole (200). Gas is injected into the air pipe (1) through the air inlet (11), and the gas is ejected from the air outlet (12) to make the scum at the bottom of the hole rise and rise to the upper side of the collection hopper (2) through the cleaning channel (22), and then fall into the collection hopper (2) through the collection port (21).

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