A soil taking device for drilling around a pile in soft soil layer

Abstract

This utility model provides a soil sampling device for drilling around piles in soft soil strata, comprising: a thick-walled steel pipe with a ring of drill teeth welded to its bottom; a spiral scraper welded to the outer wall of the thick-walled steel pipe, with a wavy edge; a flushing pipe, spirally welded to the inner wall of the thick-walled steel pipe, connected to a high-pressure water tank via a water pump, the bottom of the flushing pipe having a fan-shaped high-pressure water nozzle facing inward and downward; and a mud pipe welded to the outer wall of the thick-walled steel pipe and connected to a high-pressure grouting pump, the bottom of the mud pipe having a mud nozzle for spraying drag-reducing mud onto the scraper. This utility model achieves one-time drilling around piles in soft soil strata, with good drilling effect and high efficiency, and is applicable to various working conditions, solving the problem that the application range of traditional pile drilling methods is limited by the location of the pile foundation.

Description

Technical Field

[0001] This utility model belongs to the field of building construction, specifically a soil sampling device for drilling around piles in soft soil strata. Background Technology

[0002] Soft soil strata have poor bearing capacity, and friction piles are typically used for pile foundations, resulting in extremely deep foundations. When these piles need to be removed, the high friction between the pile and the soil can easily cause pile breakage if the removal force is too great, making direct removal difficult. It is necessary to relieve the stress between the pile and the soil. Simultaneously, the horizontal resistance of the soil around the piles in soft soil strata is low, making them prone to displacement and tilting. When pile misalignment needs correction, the large soil reaction force means that directly pushing or pulling at the pile top can easily cause excessive bending moment and pile breakage. Therefore, it is necessary to reduce or eliminate the soil reaction force.

[0003] In summary, both of the above-mentioned working conditions require drilling around the pile foundation to extract soil. However, traditional pile foundation drilling methods can only drill solid circular holes, or cannot directly retain the pile foundation within the hole during drilling to form a ring-like structure. They can only indirectly form a ring by overlapping holes, but this overlapping ring-shaped hole around the pile is only suitable for vertical pile extraction, and its efficiency is extremely low, with significant disturbance and a high risk of hole collapse. When drilling around offset pile foundations, using the aforementioned overlapping hole-to-hole ring drilling method, due to the pile's inclination, large areas of soil will always adhere to the pile perimeter, which still requires manual cleaning, affecting drilling efficiency. Therefore, to address the problems of low efficiency, poor results, inability to form a single hole, and limited application scope due to the pile foundation location of traditional pile perimeter drilling methods, there is an urgent need to invent a soil extraction device suitable for drilling around vertical and offset pile foundations in soft soil strata. Utility Model Content

[0004] To address the aforementioned technical problems, this utility model provides a soil sampling device for drilling around piles in soft soil strata. This addresses the issue that existing pile foundation drilling methods can only drill solid circular holes, or cannot directly retain the pile foundation within the hole during drilling to form a ring-like structure, but can only indirectly form a ring by overlapping holes. When drilling around offset pile foundations, the aforementioned method of overlapping holes to form a ring-shaped hole results in large areas of soil that cannot be cleared by drilling adhering to the pile periphery due to the pile's inclination, requiring manual cleaning and affecting drilling efficiency.

[0005] A soil sampling device for drilling around piles in soft soil strata includes:

[0006] Thick-walled steel pipe with a ring of drill teeth welded to its bottom;

[0007] A spiral scraper is welded to the outer wall of the thick-walled steel pipe, and its edges are wavy.

[0008] The flushing pipe is spirally welded to the inner wall of the thick-walled steel pipe and is connected to a high-pressure water tank via a water pump. The bottom of the flushing pipe is provided with a fan-shaped high-pressure water nozzle facing inward and downward.

[0009] A grout pipe is welded to the outer wall of the thick-walled steel pipe and connected to a high-pressure grouting pump. The bottom of the grout pipe is provided with a grout nozzle for spraying drag-reducing grout onto the scraper.

[0010] An auxiliary suspended flushing pipe and a mud pumping pipe are installed inside the thick-walled steel pipe and are used to suspend them on both sides of the pile foundation. The bottom of the auxiliary suspended flushing pipe is higher than the bottom of the flushing pipe. The mud pumping pipe is connected to the mud tank through a mud pump.

[0011] The sections of the thick-walled steel pipe are connected by flanges. The top of the last section of the thick-walled steel pipe is sealed and welded with a drilling rig interface. The drilling rig interface is connected to the drill rod through a pin hole and is driven to rotate by the power head of the drilling rig.

[0012] Preferably, the edge of the scraper is wavy, forming wavy teeth.

[0013] Preferably, the length of each section of the thick-walled steel pipe is 3.5m to 5m, and the annular gap width between the spiral scraper and the pile foundation is not less than 100mm.

[0014] Preferably, the high-pressure water nozzle is 0.3m to 0.5m away from the bottom of the drill bit, and the injection pressure of the mud nozzle is 1.5MPa to 3.0MPa.

[0015] Preferably, a mud pressure sensor is installed at the bottom of the flushing pipe at a distance of 5 times the pipe diameter from the high-pressure water nozzle.

[0016] Preferably, both the top inlet of the flushing pipe and the bottom of the sludge suction pipe are equipped with filter screens, the mesh size of which is 18 to 24.

[0017] Preferably, the periphery of the drilling rig interface is reinforced by welding multiple triangular stiffening ribs, which are arranged in a cross shape.

[0018] Preferably, the drag-reducing mud is prepared from 6% bentonite, 0.2% CMC and 1% KCl.

[0019] Preferably, valve I is installed on the body of the mud pumping pipe, valve II is installed at the connection point between the mud pipe and the high-pressure grouting pump, and valve III is installed at the inlet of the flushing pipe connected to the water pump.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. This utility model achieves one-time forming of pile perimeter drilling through a soil sampling device for soft soil strata. The drilling effect is good and the efficiency is high. It is also applicable to a variety of working conditions, solving the problem that the application range of traditional pile perimeter drilling methods is limited by the location of the pile foundation.

[0022] 2. This utility model uses a spiral scraper to cut the soil and maintain drilling. The mud nozzles on the side of the scraper reduce drilling resistance and form mud wall protection, ensuring drilling speed and stability.

[0023] 3. This utility model achieves efficient and stable drilling around the pile by welding multiple flushing pipes and auxiliary suspended flushing pipes inside a thick-walled steel pipe. The flushing pipes are spiral-shaped to reduce drilling resistance. The auxiliary suspended flushing pipes and multiple fan-shaped high-pressure water nozzles at the bottom of the flushing pipes can flush the soil around the pile with high-pressure water to form mud. The mud is discharged with the mud pump and mud suction pipe, thereby achieving efficient and stable drilling around the pile. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the soil sampling device for drilling around piles in soft soil strata according to this utility model.

[0025] Figure 2 This is a top view of the drilling rig interface and related components of this utility model;

[0026] Figure 3 This is a top view of the main drilling component of this utility model.

[0027] In the diagram: 1. Thick-walled steel pipe; 2. Drill teeth; 3. Scraper; 301. Corrugated teeth; 4. Flushing pipe; 401. Auxiliary suspended flushing pipe; 5. High-pressure water nozzle; 6. Mud pipe; 7. Mud nozzle; 8. Flange; 9. Pressure sensor; 10. Stiffening rib; 11. Drilling rig interface; 1101. Pin hole; 12. High-pressure grouting pump; 1201. Drag-reducing mud; 13. Water pump; 14. High-pressure water tank; 15. Mud pool; 16. Mud pump; 17. Mud pipe; 18. Valve I; 1801. Valve II; 1802. Valve III; 19. Drilling rig; 1901. Drill rod; 1902. Power head. Detailed Implementation

[0028] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of this utility model.

[0029] Example 1: As Figure 1-3 As shown, this utility model provides a soil sampling device for drilling around piles in soft soil strata, comprising:

[0030] Thick-walled steel pipe 1, with a ring of drill teeth 2 welded to its bottom, each section of thick-walled steel pipe 1 is 3.5m to 5m long, the annular gap between the spiral scraper 3 and the pile foundation is not less than 100mm, the edge of the scraper 3 is wavy, forming wavy teeth 301;

[0031] Spiral scraper 3 is welded to the outer wall of thick-walled steel pipe 1, and its edge is wavy.

[0032] The flushing pipe 4 is spirally welded to the inner wall of the thick-walled steel pipe 1. It is connected to the high-pressure water tank 14 through the water pump 13. The bottom of the flushing pipe 4 is equipped with a fan-shaped high-pressure water nozzle 5 facing inward and downward. The high-pressure water nozzle 5 is 0.3m to 0.5m away from the bottom of the drill bit 2. The injection pressure of the mud nozzle 7 is 1.5MPa to 3.0MPa. The top inlet of the flushing pipe 4 and the bottom of the mud pumping pipe 17 are equipped with filter screens with a mesh size of 18 to 24 mesh. At the bottom of the flushing pipe 4, a mud pressure sensor 9 is installed at a distance of 55 times the pipe diameter from the high-pressure water nozzle.

[0033] The mud pipe 6 is welded to the outer wall of the thick-walled steel pipe 1 and connected to the high-pressure grouting pump 12. The bottom of the mud pipe 6 is provided with a mud nozzle 7 for spraying drag-reducing mud 1201 onto the scraper 3. The drag-reducing mud 1201 is prepared from 6% bentonite, 0.2% CMC and 1% KCl.

[0034] The auxiliary suspended flushing pipe 401 and the mud pumping pipe 17 are installed inside the thick-walled steel pipe 1 and are used to suspend on both sides of the pile foundation. The bottom of the auxiliary suspended flushing pipe 401 is higher than the bottom of the flushing pipe 4. The mud pumping pipe 17 is connected to the mud tank 15 through the mud pumping pump 16.

[0035] A valve I 18 is installed on the body of the mud pumping pipe 17. A valve II 1801 is installed at the connection point between the mud pipe 6 and the high-pressure grouting pump 12. A valve III 1802 is installed at the inlet of the flushing pipe 4 connected to the water pump 13.

[0036] The sections of the thick-walled steel pipe 1 are connected by flanges 8. The top of the last section of the thick-walled steel pipe 1 is closed and welded with a drilling interface 11. The periphery of the drilling interface 11 is reinforced by welding multiple triangular stiffening ribs 10. The stiffening ribs 10 are arranged in a cross shape. The drilling interface 11 is connected to the drill rod 1901 through a pin hole 1101 and is driven to rotate by the power head 1902 of the drilling rig 19.

[0037] Example 2: Based on Example 1, the present invention welds a vertically arranged mud pipe 6 with a spiral scraper 3 bearing wavy teeth 301 to the outer wall of a thick-walled steel pipe 1. The thickness of the thick-walled steel pipe 1 is 8-15mm. The outer diameter of the scraper 3 is approximately 2-3cm from the outer diameter of the thick-walled steel pipe 1. A mud nozzle 7 is installed at the bottom of the mud pipe 6. The mud nozzle 7 sprays a prepared drag-reducing mud 1201 onto the scraper 3 to reduce drilling resistance and act as a mud wall protector. The drag-reducing mud 1201 is prepared from 6% bentonite + 0.2% CMC + 1% KCl. A ring of wear-resistant drill teeth 2 is welded to the bottom of the thick-walled steel pipe 1. Three spiral flushing pipes 4 are welded to the inner wall of the thick-walled steel pipe 1. A high-pressure water nozzle 5 is installed at the bottom of the flushing pipe 4. A mud pressure sensor 9 is installed at a distance of 5 times the pipe diameter from the nozzle. The diameter of the flushing pipe 4 is 65mm, and the pressure of the high-pressure water nozzle 5 is 2.2MPa. The suspended flushing pipe 401 is suspended on both sides of the pile foundation during pile perimeter drilling and gradually lowered with the drilling depth. High-pressure water nozzles 5 are also installed at the bottom to assist in flushing the soil around the pile. The connection between the top of the flushing pipe 4 and the pipeline adopts rotary sealing technology. The inlet of the top of the flushing pipe 4 is also equipped with a filter screen with a size of 18-24 mesh. Every 5m of drilling, the reverse flushing pipe 4 is flushed for 2-3 minutes. When the mud in the borehole accumulates to a certain amount, the mud pump 16 connected to the mud pump 17 pumps the mud around the pile to the storage pool on the surface. Each section of the thick-walled steel pipe 1 is 3.5m-5m long and has 8 flange holes at the top. After the flanges 8 are installed, the pipe can be connected. The top of the last section of the thick-walled steel pipe 1 is sealed and welded with stiffening ribs 10 and drilling rig interface 11. During drilling, the rotation of the power head 1902 of the drilling rig 19 drives the thick-walled steel pipe 1 to rotate in conjunction with the high-pressure water nozzles 5 to achieve pile perimeter drilling.

[0038] The embodiments of this utility model are given for the purpose of illustration and description. Although embodiments of this utility model have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this utility model. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this utility model.

Claims

1. A soil sampling device for drilling around piles in soft soil strata, characterized in that, include: A thick-walled steel pipe (1) with a ring of drill teeth (2) welded to its bottom; A spiral scraper (3) is welded to the outer wall of the thick-walled steel pipe (1), and its edge is wavy. The flushing pipe (4) is spirally welded to the inner wall of the thick-walled steel pipe (1), and it is connected to the high-pressure water tank (14) through the water pump (13). The bottom of the flushing pipe (4) is provided with a fan-shaped high-pressure water nozzle (5) facing inward and downward. A mud pipe (6) is welded to the outer wall of the thick-walled steel pipe (1) and connected to a high-pressure grouting pump (12). The bottom of the mud pipe (6) is provided with a mud nozzle (7) for spraying drag-reducing mud (1201) onto the scraper (3). An auxiliary suspended flushing pipe (401) and a mud pumping pipe (17) are installed inside the thick-walled steel pipe (1) for suspension on both sides of the pile foundation. The bottom of the auxiliary suspended flushing pipe (401) is higher than the bottom of the flushing pipe (4). The mud pumping pipe (17) is connected to the mud tank (15) through a mud pump (16). The sections of the thick-walled steel pipe (1) are connected by flanges (8). The top of the last section of the thick-walled steel pipe (1) is closed and welded with a drilling interface (11). The drilling interface (11) is connected to the drill rod (1901) through a pin hole (1101) and is driven to rotate by the power head (1902) of the drilling rig (19).

2. The soil sampling device for pile perimeter drilling in soft soil strata as described in claim 1, characterized in that: The edge of the scraper (3) is wavy, forming wavy teeth (301).

3. The soil sampling device for pile perimeter drilling in soft soil strata as described in claim 1, characterized in that: The length of each section of the thick-walled steel pipe (1) is 3.5m to 5m, and the annular gap width between the spiral scraper (3) and the pile foundation is not less than 100mm.

4. The soil sampling device for pile perimeter drilling in soft soil strata as described in claim 1, characterized in that: The high-pressure water nozzle (5) is 0.3m to 0.5m away from the bottom of the drill bit (2), and the injection pressure of the mud nozzle (7) is 1.5MPa to 3.0MPa.

5. The soil sampling device for pile perimeter drilling in soft soil strata as described in claim 1, characterized in that: A mud pressure sensor (9) is installed at the bottom of the flushing pipe (4) at a distance of 5 times the pipe diameter from the high-pressure water nozzle (5).

6. The soil sampling device for pile perimeter drilling in soft soil strata as described in claim 1, characterized in that: The top inlet of the flushing pipe (4) and the bottom of the mud suction pipe (17) are both equipped with filter screens, the mesh size of which is 18 to 24.

7. The soil sampling device for pile perimeter drilling in soft soil strata as described in claim 1, characterized in that: The periphery of the drilling rig interface (11) is reinforced by welding multiple triangular stiffening ribs (10), which are arranged in a cross shape.

8. The soil sampling device for pile perimeter drilling in soft soil strata as described in claim 1, characterized in that: The drag-reducing mud (1201) is prepared from 6% bentonite, 0.2% CMC and 1% KCl.

9. The soil sampling device for pile perimeter drilling in soft soil strata as described in claim 1, characterized in that: The mud pumping pipe (17) is equipped with valve I (18). The connection between the mud pipe (6) and the high-pressure grouting pump (12) is equipped with valve II (1801), and the flushing pipe (4) is equipped with valve III (1802) at the inlet of the water pump (13).

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