A bored pile hole cleaning device and construction method

Abstract

The application provides a bored pile hole cleaning device and construction method in the technical field of foundation construction, which comprises a mounting plate supported above a bored pile hole, a casing pipe extending downward into the bored pile hole is arranged on the mounting plate, the casing pipe comprises an inner wall and an outer wall, the lower end of the inner wall is sealed with the lower end of the outer wall through an annular bottom plate, an annular cavity is formed between the inner wall, the outer wall and the annular bottom plate, a grout inlet pipe and a grout outlet pipe are arranged on the upper part of the inner wall, an air inlet pipe one and an air inlet pipe two are arranged on the outer wall, the air inlet pipe one and the air inlet pipe two are connected with the annular cavity, a plurality of air ducts extending downward in a direction inclined to the direction of the bored pile hole are formed on the outer wall, a sealing ring is arranged between the outer wall above the air ducts and the side wall of the bored pile hole, and a plurality of crushing knives are rotatably connected to the annular bottom plate.

Description

Technical Field

[0001] This invention belongs to the field of foundation construction technology, and specifically relates to a hole cleaning device and construction method for bored cast-in-place piles. Background Technology

[0002] Drilled cast-in-place piles are piles constructed by creating pile holes in the ground on-site through mechanical drilling, also known as cast-in-place pile holes, placing a reinforcing cage inside, and pouring concrete into the holes. Hole cleaning is a crucial step in the construction of drilled cast-in-place piles, and the quality of hole cleaning directly affects the quality of the completed pile. Traditional positive circulation rotary drilling uses the following hole cleaning method: after drilling is completed, the drill bit is removed, and the drilling mud, agitated by the drill bit and injected, replaces the mud with a large amount of suspended drill cuttings in the hole.

[0003] However, in existing hole cleaning devices for cast-in-place piles, mud tends to adhere to the inside of the transmission housing during hole cleaning, reducing the efficiency of hole cleaning. Furthermore, some mud lumps or gravel are too large, making it difficult for the mud to carry them out or causing them to get stuck inside the transmission housing when they are carried out, affecting the work and making it inconvenient to use, further reducing the efficiency of hole cleaning. Summary of the Invention

[0004] In view of the deficiencies in the prior art, the purpose of this invention is to solve the shortcomings of the prior art, and to solve the technical problems of inconvenience in use and low hole cleaning efficiency in the prior art, so as to provide a hole cleaning device and construction method for bored piles. This device is easy to use and has high hole cleaning efficiency.

[0005] The objective of this invention is achieved as follows: a borehole cleaning device for bored piles includes an mounting plate supported above the bored pile hole. The mounting plate has a protective sleeve extending downwards into the bored pile hole. The protective sleeve includes an inner wall and an outer wall. The lower ends of the inner wall and the outer wall are sealed by an annular base plate. An annular cavity is formed between the inner wall, the outer wall, and the annular base plate. A grout inlet pipe and a grout outlet pipe are provided on the upper part of the inner wall. An air inlet pipe (first) and an air inlet pipe (second) are provided on the outer wall, both of which communicate with the annular cavity. Several air ducts extending downwards at an incline towards the bored pile hole are formed on the outer wall. A sealing ring is provided between the outer wall above the air ducts and the side wall of the bored pile hole. Several cutting blades are rotatably connected to the annular base plate.

[0006] In this invention, air inlet pipe one and air inlet pipe two are respectively connected to an external air pump, slurry inlet pipe is connected to a mud pump, and slurry outlet pipe is connected to an external sedimentation tank. After the casing is hoisted into the grouting pile hole using a lifting device, the mud pump pumps mud into the slurry inlet pipe. High-pressure gas is pumped into the annular cavity through air inlet pipe one and air inlet pipe two by an external air pump. The high-pressure gas is sprayed downwards along the annular cavity and the bottom air duct, thereby impacting the bottom gravel or large mud blocks. The crushing blade can effectively crush the bottom gravel or large mud blocks, making it easy for them to be discharged along the inner wall of the casing and then along the slurry outlet pipe to the external mud sedimentation tank in a circulation loop. This achieves hole cleaning while effectively recycling mud, avoiding waste, improving hole cleaning efficiency, and the device is easy to use and can be applied to the hole cleaning work of grouting pile holes.

[0007] To enable the mounting plate to be supported above the grouting pile hole, a linear actuator is also included. The linear actuator is equipped with a telescopic rod, the upper end of which is connected to the lower side of the mounting plate. The mounting plate is supported above the grouting pile hole by the telescopic rod and the linear actuator.

[0008] In order to further crush the gravel and increase the mud flow to ensure that large pieces of gravel can be carried by the mud, a drive motor is provided on the mounting plate. The output shaft of the drive motor extends vertically downward through the mounting plate. A lifting shaft is fixed on the output shaft of the drive motor, and a propeller blade is provided on the lifting shaft.

[0009] In order to crush the gravel, the annular base plate is provided with several sealing grooves, and a crushing motor is installed in the sealing grooves. The output shaft of the crushing motor extends out of the sealing grooves, and the crushing blade is connected to the output shaft.

[0010] A construction method for a borehole cleaning device for bored piles includes the following steps:

[0011] Step S1: Level the outer edge of the grouting pile hole. After assembling the device, connect the first air inlet pipe and the second air inlet pipe to the external air pump, connect the slurry inlet pipe to the mud pump, and connect the slurry outlet pipe to the external sedimentation tank.

[0012] Step S2: Hoist the device so that the casing enters the grouting pile hole until the crushing blade contacts the bottom of the pile hole;

[0013] Step S3: Adjust the position of the casing to make the distance between the crusher and the pile hole appropriate, leaving a mud channel;

[0014] Step S4: Inject mud into the grouting pipe, start the drive motor and external air pump. The external air pump injects high-pressure gas into the grouting pile hole through air inlet pipe one and air inlet pipe two, so that the crushed stone and mud form a circulation.

[0015] Step S5: Start the crushing motor, and the crushing blade crushes the gravel at the bottom of the grouting pile hole. The mud circulation will cause the gravel to flow from the slurry outlet pipe into the external sedimentation tank.

[0016] Step S6: Control the linear actuator to repeatedly extend and retract the telescopic rod, further crushing the stone. The mud circulation continuously drives the crushed stone upward from the slurry outlet pipe into the external sedimentation tank until the crushed stone at the bottom of the grouting pile hole is completely cleaned.

[0017] Step S7: Lifting and dismantling of the device. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the present invention.

[0019] Figure 2 This is a schematic diagram of the circulation principle of the present invention.

[0020] In the diagram: 1 Mounting plate, 2 Linear actuator, 3 Grouting pile hole, 4 Drive motor, 5 Lifting shaft, 51 Propeller blade, 6 Casing, 61 Annular cavity, 62 Air duct, 63 Grout inlet pipe, 64 Grout outlet pipe, 7 Crushing section, 71 Crushing motor, 72 Crushing blade, 8 Inner wall, 9 Outer wall, 10 Annular bottom plate, 11 Air inlet pipe one, 12 Air inlet pipe two. Implementation

[0021] The invention will now be further described with reference to the accompanying drawings.

[0022] like Figure 1 and Figure 2The device for cleaning a bored pile includes a linear actuator 2 and a mounting plate 1 supported above the bored pile hole 3. A drive motor 4 is mounted on the mounting plate 1, with its output shaft vertically downwards through the plate. A lifting shaft 5 is fixed to the output shaft of the drive motor 4, and a propeller blade 51 is mounted on the lifting shaft 5. A telescopic rod is mounted on the linear actuator 2, with its upward-facing end connected to the lower side of the mounting plate 1. The mounting plate 1 is supported above the bored pile hole 3 by the telescopic rod and the linear actuator 2. A casing 6 extends downwards into the bored pile hole on the mounting plate 1. The casing 6 includes an inner wall 8 and an outer wall 9. The lower ends of the inner wall 8 and the outer wall 9 are sealed by an annular base plate 10, forming an annular cavity 61 between the inner wall 8, the outer wall 9, and the annular base plate 10. An inlet pipe 63 and an outlet pipe 64 are provided on the upper part of the inner wall 8. The 6 has a receiving cavity, and the slurry inlet pipe 63 and the slurry outlet pipe 64 are both connected to the receiving cavity. The outer wall 9 is provided with an air inlet pipe 11 and an air inlet pipe 2 12, both of which are connected to the annular cavity 61. Several air ducts 62 are opened on the outer wall 9 and extend downwards towards the direction of the grouting pile hole 3. A sealing ring is provided between the outer wall 9 above the air duct 62 and the side wall of the grouting pile hole 3, and the sealing ring seals the gap between the hole wall of the grouting pile hole 3 and the outer wall 9. Several crushing blades 72 are rotatably connected to the annular bottom plate 10. Several sealing grooves are provided on the annular bottom plate 10. A crushing motor 71 is installed in the sealing groove. The output shaft of the crushing motor 71 extends out of the sealing groove. The crushing blades 72 are connected to the output shaft to crush the bottom gravel or large mud blocks. The crushing blades 72 and the crushing motor 71 constitute the crushing part 7.

[0023] To further improve the construction method of this invention, the following steps are included:

[0024] Step S1: Level the outer edge of the grouting pile hole 3. After assembling the device, connect the air inlet pipe 11 and the air inlet pipe 2 to the external air pump, connect the slurry inlet pipe 63 to the mud pump, and connect the slurry outlet pipe 64 to the external sedimentation tank.

[0025] Step S2: Hoist the device so that the casing 6 enters the grouting pile hole 3 until the breaking blade 72 contacts the bottom of the pile hole;

[0026] Step S3: Adjust the position of the casing 6 to make the distance between the crusher 72 and the pile hole of the grouting pile appropriate, leaving a mud channel;

[0027] Step S4: Inject mud into the grouting pipe 63, start the drive motor 4 and the external air pump. The external air pump injects high-pressure gas into the grouting pile hole 3 through the air inlet pipe 11 and the air inlet pipe 22, so that the crushed stone and mud form a circulation.

[0028] Step S5: Start the crushing motor 71 and the crushing blade 72 to crush the gravel at the bottom of the grouting pile hole 3. The mud circulation will cause the gravel to flow from the slurry outlet pipe 64 into the external sedimentation tank.

[0029] Step S6: Control the linear actuator 2 to repeatedly extend and retract the telescopic rod, further crushing the stone. The mud circulation continuously drives the crushed stone upward from the slurry outlet pipe 64 into the external sedimentation tank until the crushed stone at the bottom of the grouting pile hole 3 is completely cleaned.

[0030] Step S7: Lifting and dismantling of the device.

[0031] In this invention, air inlet pipe 11 and air inlet pipe 12 are respectively connected to an external air pump, slurry inlet pipe 63 is connected to a mud pump, and slurry outlet pipe 64 is connected to the external mud sedimentation tank circulation loop. After the casing 6 is hoisted into the grouting pile hole 3 using a lifting device, mud is injected, and the drive motor 4, crushing motor 71, and external air pump are started. The mud pump pumps mud into the slurry inlet pipe 63. The sealing ring seals the gap between the wall of the grouting pile hole 3 and the outer wall 9 of the casing 6. High-pressure gas is pumped into the annular cavity 61 through air inlet pipe 11 and air inlet pipe 12 by the external air pump. The high-pressure gas is sprayed downwards along the annular cavity 61 and the bottom air duct 62, thereby impacting the bottom gravel or large mud blocks. In this process, after the initial mud injection, under the action of the high-pressure gas in the air duct 62, the mud in the grouting pile hole 3 can be effectively accelerated. A circulation is formed outside the casing 6, creating a mud slurry wall that effectively reinforces the borehole of the cast-in-place pile, preventing borehole collapse and improving construction safety. The crushing motor 71 drives the crushing blade 72 to effectively crush the bottom gravel or large mud blocks, facilitating their discharge along the inner wall 8 of the casing 6 and into the external mud sedimentation tank via the discharge pipe 64. During the cleaning process, the extension and retraction of the telescopic rod of the linear actuator 2 is controlled to ensure that the crushing blade 72 does not miss any gravel due to misalignment between the gravel and the crushing components. It also accelerates the mud flow rate, ensuring that large gravel is carried out by the mud and moved out of the crushing blind zone, which is more conducive to crushing. This not only cleans the borehole but also effectively recycles the mud, avoiding waste and improving cleaning efficiency. The device is easy to use and can be applied to the cleaning of the cast-in-place pile borehole 3.

[0032] This invention patent is not limited to the above embodiments. Based on the technical solutions disclosed in this invention patent, those skilled in the art can make some substitutions and modifications to some of the technical features without creative labor, and these substitutions and modifications are all within the protection scope of this invention patent.

Claims

1. A borehole cleaning device for bored piles, characterized in that: The system includes an installation plate supported above the grouting pile hole. The installation plate has a protective casing extending downwards into the grouting pile hole. The protective casing includes an inner wall and an outer wall. The lower ends of the inner wall and the outer wall are sealed by an annular base plate. An annular cavity is formed between the inner wall, the outer wall, and the annular base plate. A grout inlet pipe and a grout outlet pipe are provided on the upper part of the inner wall. An air inlet pipe (first) and an air inlet pipe (second) are provided on the outer wall, both of which communicate with the annular cavity. Several air ducts extending downwards at an angle towards the grouting pile hole are opened on the outer wall. A sealing ring is provided between the outer wall above the air ducts and the side wall of the grouting pile hole. Several cutting blades are rotatably connected to the annular base plate.

2. The borehole cleaning device for bored piles according to claim 1, characterized in that: It also includes a linear actuator, which has a telescopic rod. The upward end of the telescopic rod is connected to the lower side of the mounting plate, and the mounting plate is supported above the grouting pile hole by the telescopic rod and the linear actuator.

3. The borehole cleaning device for bored piles according to claim 2, characterized in that: The mounting plate is equipped with a drive motor, the output shaft of which penetrates the mounting plate vertically downwards. A lifting shaft is fixed on the output shaft of the drive motor, and a propeller blade is mounted on the lifting shaft.

4. The borehole cleaning device for bored piles according to claim 1, characterized in that: The annular base plate is provided with several sealing grooves, and a crushing motor is installed in the sealing groove. The output shaft of the crushing motor extends out of the sealing groove, and the crushing blade is connected to the output shaft.

5. The construction method of the borehole cleaning device for bored piles as described in claim 4, characterized in that, Includes the following steps: Step S1: Level the outer edge of the grouting pile hole. After assembling the device, connect the first air inlet pipe and the second air inlet pipe to the external air pump, connect the slurry inlet pipe to the mud pump, and connect the slurry outlet pipe to the external sedimentation tank. Step S2: Hoist the device so that the casing enters the grouting pile hole until the crushing blade contacts the bottom of the pile hole; Step S3: Adjust the position of the casing to make the distance between the crusher and the pile hole appropriate, leaving a mud channel; Step S4: Inject mud into the grouting pipe, start the drive motor and external air pump. The external air pump injects high-pressure gas into the grouting pile hole through air inlet pipe one and air inlet pipe two, so that the crushed stone and mud form a circulation. Step S5: Start the crushing motor, and the crushing blade crushes the gravel at the bottom of the grouting pile hole. The mud circulation will cause the gravel to flow from the slurry outlet pipe into the external sedimentation tank. Step S6: Control the linear actuator to repeatedly extend and retract the telescopic rod, further crushing the stone. The mud circulation continuously drives the crushed stone upward from the slurry outlet pipe into the external sedimentation tank until the crushed stone at the bottom of the grouting pile hole is completely cleaned. Step S7: Lifting and dismantling of the device.

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