A pile foundation and construction method suitable for high groundwater levels and large settlement.

Abstract

This invention relates to pile foundation technology and construction methods in high-water-level areas, specifically a pile foundation and construction method applicable to high-water-level areas. It includes a pile cap, an upper pile body, a lower pile body, and a pile bottom structure. The pile cap is movably installed on the top of the upper pile body. The upper pile body is connected to the lower pile body via a pile connection structure, and the lower end of the lower pile body is connected to the pile bottom structure. The upper pile body is a hollow cylindrical structure. Multiple sets of small and large grouting nozzles are provided on the side of the upper pile body. Multiple small and large grouting nozzles are provided on the top side wall of the upper pile body. These small and large grouting nozzles are respectively connected to the small and large grouting nozzles on the pile body, with the connecting channels located on the side wall of the upper pile body. This invention solves the problems of long construction periods and high costs associated with pile foundations. Furthermore, it addresses the problems of hole collapse and drill bit loss that frequently occur during pile foundation construction.

Description

Technical Field

[0001] This invention relates to pile foundation technology and construction methods in high water level areas, specifically a pile foundation and construction method applicable to high water level areas. Background Technology

[0002] When the groundwater level is high, pile foundations are generally preferred due to their high bearing capacity, good seismic performance, low settlement, and low construction noise. However, the most significant drawbacks of pile foundations are their complex construction, long construction period, and high cost. Furthermore, pile foundation construction often encounters problems such as borehole collapse and drill bit failure, slowing down the project and increasing costs. Additionally, constructing pile foundations in areas with high groundwater levels requires significant groundwater removal, increasing workload, wasting water resources, and causing environmental damage. For areas prone to severe ground subsidence, improving the settlement resistance of pile foundations is also a crucial issue in pile foundation construction.

[0003] To address the aforementioned issues, it is essential to design an environmentally friendly, efficient, and settlement-resistant pile foundation and construction method that is economical, environmentally friendly, and safe. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides a pile foundation and construction method suitable for areas with high groundwater levels and large settlement.

[0005] The present invention adopts the following technical solution: a pile foundation suitable for high groundwater level and large settlement, comprising a pile cap, an upper pile body, a lower pile body, and a pile bottom structure. The pile cap is movably installed on the top of the upper pile body. The upper pile body is connected to the lower pile body through a pile connection structure. The lower end of the lower pile body is connected to the pile bottom structure. The upper pile body is a hollow cylindrical structure. Multiple sets of small and large grouting nozzles are provided on the side of the upper pile body. Multiple small and large grouting nozzles are provided on the top side wall of the upper pile body. The small and large grouting nozzles are connected to the small and large grouting nozzles in the pile body, respectively. The connecting channels are provided on the side wall of the upper pile body.

[0006] In some embodiments, the pile cap is provided with handles on both sides.

[0007] In some embodiments, multiple suspension ports are provided around the opening at the upper part of the pile body, and the suspension ports are connected to the suspension device.

[0008] In some embodiments, the suspension device includes a suspension device metal sheet, the lower part of which passes through a suspension opening, and a suspension device circular hole provided on the upper part of the suspension device metal sheet. A screw is inserted into the circular hole, and a nut is installed on the screw. It also includes a winding bar, which passes through the suspension opening and is connected to the pile foundation reinforcement cage.

[0009] In some embodiments, the middle part of the pile connection structure is a protrusion, and the upper and lower outer sides of the connection part are provided with upper and lower threads, and the middle part of the pile connection structure is a hollow part.

[0010] In some embodiments, the lower pile body has evenly distributed spiral cutters on its outer surface.

[0011] In some embodiments, the inner plane of the bottom of the lower pile body is a regular octagon, and its height is consistent with the height of the upper structure of the pile bottom structure. The pile bottom structure is fixed to the bottom of the lower pile body.

[0012] In some embodiments, the pile bottom structure is made of steel and is divided into upper and lower parts. The upper part is an octagonal column with eight round holes distributed on the top of the octagonal column. The round holes are used to place the vertical bars of the steel cage. The lower part is a cone with drilling cutters distributed on the four sides of the cone. The upper part of the drilling cutter protrudes and gradually flattens towards the bottom of the cone. The top of the drilling cutter is double "concave".

[0013] A method for constructing pile foundations suitable for areas with high groundwater levels and large settlement includes:

[0014] S1 – Drilling: Install the pile foundation by drilling the pile foundation into the soil using a auger pile driver;

[0015] S2 - Drainage: A pumping device is installed in the borehole to drain water around the pile foundation.

[0016] S3 - Grouting: The large grouting pipe is inserted into the large grouting nozzle at the top of the pile, and the small grouting pipe is inserted into the small grouting nozzle at the top of the pile. The large grouting nozzle in the pile body can allow the grout to reach the hole wall, which plays a role in stabilizing the drilling. The small grouting nozzle in the pile body has a high grouting pressure, which impacts the hole wall and allows the grout to reach the soil.

[0017] S4 ~ Separate the reinforcing cage: After the shotcrete is completed, the hole wall is relatively stable. At this time, unscrew the pile cap and open the suspension device to separate the reinforcing cage from the upper and lower pile bodies. Use a hoist to lift the upper and lower pile bodies away from the borehole. The bottom structure of the pile and the reinforcing cage are left in the borehole.

[0018] S5 – Grouting: Concrete is poured into the reinforcing cage through a drilled hole using a grouting pipe. The reinforcing cage reaches the bottom of the hole as the drilling work progresses. After the pouring is completed, the concrete and the grout on the hole wall become one, and the concrete and grout solidify into a single unit.

[0019] In some embodiments, the water pumping device includes a water pump, a water pipe, and a water filtration device. The water pump is connected to the water pipe and enters the bottom of the borehole. The bottom end of the water pipe is threaded and connected to the water filtration device through a fixing device.

[0020] Compared with existing technologies, this invention solves the problems of long construction cycles and high costs associated with pile foundations. Furthermore, it addresses common issues during pile foundation construction such as borehole collapse and drill bit loss, accelerating project progress and reducing costs. It also reduces water waste and environmental damage. In areas prone to severe ground subsidence, it improves the settlement resistance of the pile foundation. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of a pile structure;

[0022] Figure 2 This is a schematic diagram of the bottom of the lower pile.

[0023] Figure 3 This is a schematic diagram of the upper pile structure;

[0024] Figure 4 This is a schematic diagram of the hanging port structure;

[0025] Figure 5 This is a schematic diagram of the pile connection section;

[0026] Figure 6 This is a schematic diagram of the pile connection point;

[0027] Figure 7 This is a schematic diagram of the pile bottom structure;

[0028] Figure 8 This is a top view of the pile bottom structure;

[0029] Figure 9 This is a bottom view of the pile bottom structure;

[0030] Figure 10 This is a schematic diagram of a water pumping and filtration device;

[0031] Figure 11 This is a schematic diagram of the fixing device;

[0032] Figure 12 This is a diagram illustrating the pumping process;

[0033] Figure 13 This is a schematic diagram of shotcrete.

[0034] Figure 14 This is a schematic diagram of the shotcrete pipe;

[0035] In the diagram: 1-Pile cap, 2-Handle, 3-Upper pile body, 4-Lower pile body, 5-Spiral cutter, 6-Pile bottom structure, 7-Small grouting nozzle on pile body, 8-Large grouting nozzle on pile body, 9-Pile connection structure, 10-Small grouting nozzle at pile top, 11-Threaded upper pile body, 12-Hanging port, 13-Large grouting nozzle at pile top, 14-Round hole for hanging device, 15-Metal plate for hanging device, 16-Nut, 17-Screw, 18-Wound reinforcement, 19-Connecting pile body, 20-Inner thread, 21-Bottom of lower pile body, 22-Water pumping and filtering device, 23- Water pump, 24-fixed device, 25-water pumping pipe, 26-large grouting nozzle, 27-small grouting nozzle, 28-large grouting pipe, 29-small grouting pipe, 61-octagonal column, 62-round hole, 63-drilling cutter, 64-cone, 91-hollow part, 92-protrusion, 93-upper thread, 94-lower thread of connecting part, 221-metal pipe, 222-round hole of metal pipe, 223-base, 241-metal sheet, 242-fixed device gasket, 243-fixed device screw, 244-fixed device nut. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0037] like Figure 1 As shown, a pile foundation suitable for high groundwater levels and large settlement includes a pile cap 1, an upper pile body 3, a lower pile body 4, and a pile bottom structure 6. The pile cap 1 is movably installed on the top of the upper pile body 3. The upper pile body 3 is connected to the lower pile body 4 through a pile connection structure 9. The lower end of the lower pile body 4 is connected to the pile bottom structure 6. The upper pile body 3 is a hollow cylindrical structure. Multiple sets of small grouting nozzles 7 and large grouting nozzles 8 are provided on the side of the upper pile body 3. Multiple small grouting nozzles 10 and large grouting nozzles 13 are provided on the top side wall of the upper pile body 3. The small grouting nozzles 10 and large grouting nozzles 13 are connected to the small grouting nozzles 7 and large grouting nozzles 8 of the pile body, respectively. The connecting channels are provided on the side wall of the upper pile body 3.

[0038] The pile cap 1 has handles 2 on both sides for connecting the pile cap to the upper pile body.

[0039] like Figure 3 As shown, multiple suspension ports 12 are provided around the opening position at the top of the upper pile body 3, and the suspension ports 12 are connected to the suspension device.

[0040] like Figure 4As shown, the suspension device includes a suspension device metal plate 15, the lower part of which passes through the suspension opening 12, and the upper part of which is provided with a suspension device circular hole 14. A screw 17 is inserted into the suspension device circular hole 14, and a nut 16 is installed on the screw 17. It also includes a winding bar 18, which passes through the suspension opening 12 and is connected to the pile foundation reinforcement cage.

[0041] like Figure 5 As shown, the pile connection structure 9 has a raised portion 92 in the middle, and upper threads 93 and lower threads 94 are provided on the outer sides of the upper and lower parts of the connection. The pile connection structure 9 also has a hollow portion 91 in the middle. Figure 6 As shown, the upper part of the lower pile body 4 is the connection part, including the connecting pile body 19 and the internal thread of the connecting pile body 19, which is threadedly connected to the lower thread 94.

[0042] The lower pile body 4 has evenly distributed spiral cutters 5 on its exterior.

[0043] The inner plane of the bottom of the lower pile body 4 is a regular octagon, and its height is consistent with the height of the upper structure of the pile bottom structure. The pile bottom structure is fixed to the bottom of the lower pile body 4.

[0044] like Figure 7-9 As shown, the pile bottom structure 6 is made of steel and is divided into upper and lower parts. The upper part is an octagonal column 61 with eight round holes 62 distributed on the top of the octagonal column 61. The round holes 62 are used to place the vertical bars of the steel cage. The lower part is a cone 64 with drilling cutters 63 distributed on the four sides of the cone 64. The upper part of the drilling cutter 63 is raised and gradually flattens towards the bottom of the cone. The top of the drilling cutter is double "concave".

[0045] (1) Drilling:

[0046] The upper and lower pile bodies are connected via a connecting section, and the reinforcing cage is fixed to the upper pile body via a suspension device. The vertical bars of the reinforcing cage are inserted into the circular holes in the bottom structure and connected to the bottom structure by welding. The bottom slope of the lower pile body is octagonal, allowing it to be inserted into the bottom structure. The pile cap is threadedly connected to the upper pile body by turning the handle. After installation, a auger pile driver is used to drill the pile into the soil. During drilling, the sealed top and bottom of the pile effectively prevents groundwater from entering the pile body. The pile body has a auger cutter, and the bottom structure has a drilling cutter, which can accelerate the drilling speed and increase the construction speed.

[0047] (2) Drainage:

[0048] like Figure 10-14 As shown, Figure 1-14 As shown, the water pumping device includes a water pump 23, a water pumping pipe 25, and a water pumping filter 22. The water pump 23 is connected to the water pumping pipe 25 and enters the bottom of the borehole. The bottom end of the water pumping pipe 25 has threads and is connected to the water pumping filter 22 through a fixing device 24.

[0049] The water pumping and filtration device 22 includes a metal tube 221 with a closed top. Multiple rows of metal tube holes 222 are provided on the upper part of the metal tube 221 as filter holes. The diameter of the metal tube holes 222 gradually decreases from top to bottom. The bottom of the metal tube 221 is fixed on the base 223. The lower end of the metal tube 221 is U-shaped. The metal tube 221 is threadedly connected to the water pumping pipe 25.

[0050] The water pumping pipe 25 is a PPR pipe with a threaded end, and it is connected to the water pumping and filtering device 22 via a fixing device 24. The connection between the water pumping and filtering device 22 and the water pumping pipe 25 is threaded on the outside, and the two devices are connected by this thread. The fixing device 24 is a metal plate 241 with round holes at both the top and bottom. Fixing screws 243 and nut 244 secure the metal plate as a ring through these holes. A washer is located downstream of the screw. The fixing device is used to secure the connection between the water pumping device and the water pumping pipe.

[0051] A water pump extracts groundwater from the borehole through a pumping pipe. The pumping pipe connects to a water filtration device, whose lower part is a solid hemispherical metal structure that reaches the bottom of the borehole under gravity. The water filtration device consists of circular holes with a larger diameter at the top and a smaller diameter at the bottom. This is primarily to prevent large particles of sediment from clogging the filtration device at the bottom, while the upper part is mainly responsible for groundwater extraction. Groundwater extraction only needs to consider the area around the pile, reducing the amount of groundwater being extracted. Furthermore, because the pile is inside the borehole, it provides some stability to the borehole wall during the extraction process, reducing the probability of borehole collapse.

[0052] (3) Shotcrete:

[0053] A large grouting pipe is inserted into the large grouting nozzle at the top of the pile, and a small grouting pipe is inserted into the small grouting nozzle at the top of the pile; both are connected by threads. The large grouting nozzle is mainly for the grout to reach the borehole wall, thus stabilizing the borehole. The small grouting pipe sprays grout at a high pressure, impacting the borehole wall and forcing the grout into the soil, thus preventing pile foundation settlement.

[0054] (4) Separate the reinforcing cage:

[0055] After shotcreting, the borehole wall is relatively stable. At this point, the pile cap is unscrewed, and the suspension device is opened to separate the reinforcing cage from the pile body. Since the bottom structure is only inserted into the lower pile body, separating the suspension device allows for analysis of the reinforcing cage and pile body. A hoist is used to lift the pile body out of the borehole, leaving the bottom structure and reinforcing cage inside. Due to the shotcreting effect, the pile bottom structure is encased in cement grout. The reuse of the pile body saves on labor costs and reduces the impact on construction progress caused by drill bit drops or borehole collapse.

[0056] (5) Grouting:

[0057] Concrete is poured into the reinforcing cage through a drilled hole using a grouting pipe. The cage reaches the bottom of the hole as the drilling progresses, preventing issues such as difficulty in lowering the cage into the borehole or damage to the borehole wall during hoisting. After pouring, the concrete and grout fuse together, forming a unified whole as the concrete and grout solidify. The grouting within the borehole wall effectively prevents pile settlement.

Claims

1. A pile foundation suitable for high groundwater levels and large settlement, characterized in that, It includes a pile cap (1), an upper pile body (3), a lower pile body (4) and a pile bottom structure (6). The pile cap (1) is movably installed on the top of the upper pile body (3). The upper pile body (3) is connected to the lower pile body (4) through the pile connection structure (9). The lower end of the lower pile body (4) is connected to the pile bottom structure (6). The upper pile body (3) is a hollow cylindrical structure. Multiple sets of small grouting nozzles (7) and large grouting nozzles (8) are provided on the side of the upper pile body (3). Multiple small grouting nozzles (10) and large grouting nozzles (13) are provided on the top side wall of the upper pile body (3). The small grouting nozzles (10) and large grouting nozzles (13) are connected to the small grouting nozzles (7) and large grouting nozzles (8) of the pile body, respectively. The connecting channel is set on the side wall of the upper pile body (3). Multiple hanging ports (12) are provided around the upper opening of the upper pile body (3), and the hanging ports (12) are connected to the hanging device. The suspension device includes a suspension device metal plate (15), the lower part of which passes through the suspension opening (12), and the upper part of which is provided with a suspension device round hole (14). A screw (17) is inserted into the suspension device round hole (14), and a nut (16) is installed on the screw (17). It also includes a winding bar (18), which passes through the suspension opening (12) and connects to the pile foundation steel cage. The suspension device is opened to separate the steel cage from the upper pile body (3) and the lower pile body (4).

2. The pile foundation applicable to high groundwater levels and large settlement as described in claim 1, characterized in that, The pile cap (1) is provided with handles (2) on both sides.

3. The pile foundation applicable to high groundwater levels and large settlement as described in claim 1, characterized in that, The pile connection structure (9) has a protruding part (92) in the middle, and upper threads (93) and lower threads (94) are provided on the outer sides of the upper and lower parts of the connection part. The pile connection structure (9) has a hollow part (91) in the middle.

4. The pile foundation applicable to high groundwater levels and large settlement as described in claim 1, characterized in that, The lower pile body (4) has evenly distributed spiral cutters (5) on its outside.

5. The pile foundation applicable to high groundwater levels and large settlement as described in claim 1, characterized in that, The inner plane of the bottom of the lower pile body (4) is a regular octagon, and its height is consistent with the height of the upper structure of the pile bottom structure. The pile bottom structure is fixed to the bottom of the lower pile body (4).

6. The pile foundation applicable to high groundwater levels and large settlement as described in claim 1, characterized in that, The pile bottom structure (6) is made of steel and is divided into two parts: the upper part is an octagonal column (61) with eight round holes (62) distributed on the top of the octagonal column (61). The round holes (62) are used to place the vertical bars of the steel cage. The lower part is a cone (64) with drilling cutters (63) distributed on the four sides of the cone (64). The upper part of the drilling cutter (63) protrudes and gradually flattens towards the bottom of the cone. The top of the drilling cutter is double "concave".

7. A method for constructing pile foundations suitable for areas with high groundwater levels and large settlement, characterized in that, include: S1 Drilling: Install the pile foundation as described in any one of claims 1-6 by using a auger pile driver to drill the pile foundation into the soil; S2 - Drainage: A pumping device is installed in the borehole to drain water around the pile foundation. S3~Groutine: The large grouting pipe is inserted into the large grouting port (13) at the top of the pile, and the small grouting pipe is inserted into the small grouting port (10) at the top of the pile. The large grouting port (8) in the pile body can allow the grout to reach the hole wall and play a role in stabilizing the drilling. The small grouting port (7) in the pile body has a large grouting pressure, which impacts the hole wall and allows the grout to reach the soil. S4 ~ Separate the reinforcing cage: After the shotcrete is completed, the hole wall is relatively stable. At this time, unscrew the pile cap (1) and open the suspension device to separate the reinforcing cage from the upper pile body (3) and the lower pile body (4). Use a hoist to lift the upper pile body (3) and the lower pile body (4) away from the borehole. The bottom structure (6) of the pile and the reinforcing cage are left in the borehole. S5 – Grouting: Concrete is poured into the reinforcing cage through a drilled hole using a grouting pipe. The reinforcing cage reaches the bottom of the hole as the drilling work progresses. After the pouring is completed, the concrete and the grout on the hole wall become one, and the concrete and grout solidify into a single unit.

8. The pile foundation construction method according to claim 7, applicable to areas with high groundwater levels and large settlement, is characterized in that... The water pumping device includes a water pump (23), a water pipe (25), and a water filtration device (22). The water pump (23) is connected to the water pipe (25) and enters the bottom of the borehole. The bottom end of the water pipe (25) has a thread and is connected to the water filtration device (22) through a fixing device (24).

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