High-pressure jet grouting anti-floating pile structure

Abstract

The utility model discloses a high-pressure jet grouting anti-floating pile structure, relates to the field of foundations, and aims to improve the pile forming quality of an anti-floating pile and improve the bearable pulling resistance of an anti-floating steel bar. According to the technical scheme, the high-pressure jet grouting anti-floating pile structure is characterized in that a pile head inserted into a pile hole is arranged at the bottom of the pile hole, a pouring consolidation body is arranged in the pile hole, a jet grouting consolidation body is arranged outside the pile hole, and the pouring consolidation body is a consolidation body formed by filling aggregate into the pile hole and pouring grout. The jet grouting consolidation body is a consolidation body formed by high-pressure jet grouting of grout to the hole wall of the pile hole, and the pouring consolidation body and the jet grouting consolidation body are integrated; at least one anti-floating reinforcing steel bar is further embedded in the pouring consolidation body, the lower end of each anti-floating reinforcing steel bar is fixedly connected with the pile head, at least one section of embedded reinforcing steel bar is fixed to the periphery of each anti-floating reinforcing steel bar, the anti-floating reinforcing steel bars and the embedded reinforcing steel bars are located in the pouring consolidation body, and the embedded reinforcing steel bars improve the pulling resistance of the anti-floating reinforcing steel bars. The device is used for construction of the high-pressure jet grouting anti-floating pile.

Description

Technical Field

[0001] This utility model relates to the field of basic science, specifically a high-pressure jet grouting anti-buoyancy pile structure. Background Technology

[0002] Anti-buoyancy anchors are primarily used to address the problem of buildings floating under high water levels. The anchor section is inserted deep into stable underground strata, utilizing the friction of the anchor section and its interaction with the surrounding soil to resist the buoyancy caused by groundwater, thus maintaining the building's stability. The friction between the anchor section and the soil is closely related to the roughness, length, and diameter of the anchor section, as well as the physical properties of the soil.

[0003] Patent CN 208685601 U discloses a composite expanded diameter anti-buoyancy steel anchor bolt, comprising a cement-soil layer and a columnar anchor bolt. Several outwardly extending connecting ribs are fixed to the outer wall of the anchor bolt, arranged along the anchor bolt's axis. The cement-soil layer includes a column and a variable diameter body, the diameter of which is larger than the diameter of the column. The variable diameter body is integrally connected to the column along its axis. On one hand, this patent utilizes the variable diameter construction of the cement-soil layer, where the weight of the soil presses down on the variable diameter body, fully leveraging the strength of both the anchor bolt and the soil layer, thus improving the pull-out resistance of the composite expanded diameter anti-buoyancy steel anchor bolt. On the other hand, the patent incorporates several connecting ribs on the anchor bolt, extending from the anchor bolt's surface and residing within the cement-soil layer, increasing the connection strength between the anchor bolt and the cement-soil layer, enhancing their overall integrity, and thereby improving the anti-buoyancy effect. Because the anchor rod is equipped with several connecting bars, if the connecting bars are too short, they cannot effectively increase the connection strength between the anchor rod and the cement-soil layer; if the connecting bars are too long, they will bend upwards and fit against the anchor rod, causing them to lose their intended function; the connecting bars will also affect the installation of the anchor rod, causing the anchor rod to bend and fail to be installed to the intended position. Utility Model Content

[0004] This utility model provides a high-pressure jet grouting anti-buoyancy pile structure, aiming to improve the pile formation quality of anti-buoyancy piles and enhance the pull-out resistance that the anti-buoyancy reinforcement can withstand.

[0005] The technical solution adopted in this utility model is as follows: a high-pressure jet grouting anti-buoyancy pile structure, the bottom of the pile hole is the pile head inserted into the pile hole, the inside of the pile hole is a grouting solidified body, and the outside of the pile hole is a jet grouting solidified body. The grouting solidified body is a solidified body formed by filling the pile hole with aggregate and grouting, and the jet grouting solidified body is a solidified body formed by high-pressure jet grouting to the hole wall of the pile hole. The grouting solidified body and the jet grouting solidified body are a whole. At least two connecting bolts are provided on the top surface of the pile head along the circumferential direction. Each connecting bolt is arranged along the circumferential direction. At least one anti-buoyancy steel bar is also embedded inside the grouting solidified body. The lower end of each anti-buoyancy steel bar is fixedly connected to the pile head. At least one section of embedded steel bar is fixed to the outer periphery of each anti-buoyancy steel bar. Both the anti-buoyancy steel bar and the embedded steel bar are located in the grouting solidified body. The embedded steel bar includes a fixed cylinder and at least one steel bar segment fixed to the outer wall of the fixed cylinder. The anti-buoyancy steel bar passes through the fixed cylinder and is welded and fixed. The steel bar segment is perpendicular to the anti-buoyancy steel bar, or the end of the steel bar segment away from the anti-buoyancy steel bar is inclined upward.

[0006] To further improve the pull-out resistance of the anti-buoyancy steel bars, the pile holes are arranged vertically and penetrate the upper hard stratum into the lower soft stratum. The pile holes also penetrate the soft stratum and reach or enter the good stratum below the soft stratum. The hard stratum is a pebble layer, the soft stratum is a sand layer, and the good stratum is a pebble layer or a bedrock layer.

[0007] To ensure the strength of the pile head, furthermore: the pile head is made of metal, or the pile head includes an outer shell and reinforced concrete inside the outer shell, with the lower section of the connecting bolt embedded in the reinforced concrete inside the outer shell, and the upper section of the connecting bolt protruding from the top surface of the pile head.

[0008] To facilitate the downward insertion of the pile head into the pile hole, the pile head is further divided into two vertical sections: the lower section is conical or pyramidal, and the upper section is cylindrical or a frustum-shaped structure with a larger bottom and a smaller top. The diameter of the cylinder is not greater than the diameter of the pile hole, and the diameter of the bottom surface of the frustum is not greater than the diameter of the pile hole.

[0009] To facilitate the connection between the anti-buoyancy reinforcement and the pile head, and to ensure the strength of the connection, a further step is taken: a connecting bar is provided at the center of the top surface of the pile head. The number of connecting bars is equal to the number of anti-buoyancy reinforcement bars. The lower section of each connecting bar is fixed inside the pile head, while the upper section of each connecting bar protrudes from the top surface of the pile head. The lower end of each anti-buoyancy reinforcement bar is fixedly connected to the lower end of each connecting bar. For example, the connecting bar and the anti-buoyancy reinforcement are fixedly connected by a connecting sleeve. The upper end of the connecting bar and the lower end of the anti-buoyancy reinforcement bar connected to it are located in the openings at both ends of the same connecting sleeve and are connected by thread or welding.

[0010] The embedded reinforcing bars are embedded in the grouting consolidation body of the anti-buoyancy pile to improve the strength of the grouting consolidation body, thereby enhancing the pull-out resistance of the anti-buoyancy reinforcing bars. To facilitate the installation of the embedded reinforcing bars, the embedded reinforcing bars further include a fixing cylinder and at least one reinforcing bar segment fixed to the outer wall of the fixing cylinder. The anti-buoyancy reinforcing bar passes through the fixing cylinder and is welded and fixed. The reinforcing bar segment is perpendicular to the anti-buoyancy reinforcing bar, or the end of the reinforcing bar segment away from the anti-buoyancy reinforcing bar is inclined upward.

[0011] To ensure that each anti-buoyancy steel bar is arranged along the centerline of the pile hole, at least one positioning ring is fitted around the outside of the anti-buoyancy steel bar. The diameter of the positioning ring is adapted to the diameter of the pile hole, and each anti-buoyancy steel bar is fixedly connected to the positioning ring and located near the centerline of the pile hole.

[0012] Specifically: The positioning ring has an outer ring, a middle ring and an inner ring on the horizontal plane. The outer ring is fitted with the hole wall of the pile hole with a clearance fit. The outer ring and the middle ring are connected by at least one connecting rod. The middle ring and the inner ring are connected by at least one connecting rod. The middle ring and the inner ring are concentric circles. The anti-buoyancy steel bars are fixed between the middle ring and the inner ring.

[0013] To improve the density of the aggregate and promote its diffusion into the weak strata outside the pile hole, the aggregate in the grouting consolidation body is further composed of pebbles with a diameter of 0.5 to 2.0 cm.

[0014] The beneficial effects of this high-pressure jet grouting anti-buoyancy pile structure are as follows: both the anti-buoyancy reinforcement and the embedded reinforcement are located within the grouting solidification body, improving the strength of the grouting solidification body. The grouting solidification body and the jet grouting solidification body solidify simultaneously and become a whole, which not only saves construction time but also improves the pull-out resistance of the anti-buoyancy reinforcement. At least two connecting bolts are provided circumferentially on the top surface of the pile head, with each bolt arranged circumferentially to facilitate connection of the pile head to the casing. Simultaneously, the anti-buoyancy reinforcement and the embedded reinforcement are placed into the casing. By pressing down or hammering the upper end of the casing, the entire anti-buoyancy anchor installation device can be inserted to the predetermined depth, ensuring that the pile head is inserted into the predetermined position within the pile hole. This invention improves the pull-out resistance and pile formation quality of the anti-buoyancy pile. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of one embodiment of a high-pressure jet grouting anti-buoyancy pile structure according to the present invention.

[0016] Figure 2 yes Figure 1 The illustrated embodiment is a schematic diagram of the anti-buoyancy anchor bolt construction device assembled during construction.

[0017] Figure 3 yes Figure 2 The illustrated embodiment is a structural schematic diagram on the horizontal cross-section corresponding to the positioning ring.

[0018] Figure 4This is a schematic diagram of an example of embedded reinforcing bars in this utility model.

[0019] Attached reference numerals: 1. Pile head, 1-1. Connecting bolt, 1-2. Outer shell, 1-3. Reinforced concrete, 1-4. Connecting bar, 2. Casing, 2-1. Connecting ring, 3. Fixing rod, 4. Anti-buoyancy reinforcement, 5. Embedded reinforcement, 5. Fixing sleeve, 5-1. Reinforcing bar segment, 5-2. Connecting sleeve, 6. Positioning ring, 7. Outer ring, 7-1. Middle ring, 7-2. Inner ring, 7-3. Connecting rod, 7-4. Pile hole, 8. Grouting solidified body, 8-1. Jet grouting solidified body, 8-2. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings.

[0021] like Figure 1 As shown, the bottom of the pile hole 8 of this utility model's high-pressure jet grouting anti-buoyancy pile structure is the pile head 1 inserted into the pile hole 8. The pile hole 8 contains a grouting consolidation body 8-1, and the pile hole 8 is surrounded by a jet grouting consolidation body 8-2. The pile hole 8 is vertically arranged and penetrates the upper hard strata to enter the lower soft strata. The pile hole 8 can also penetrate the soft strata to reach or enter the good strata below the soft strata. The hard strata are generally pebble layers, the soft strata are generally sand layers or other strata that can be treated by high-pressure jet grouting, and the good strata are generally pebble layers or bedrock layers. The grouting consolidation body 8-1 is a consolidation body formed by filling the pile hole 8 with aggregate and injecting grout. To facilitate aggregate diffusion and dense filling, the aggregate is preferably pebbles, for example, pebbles with a diameter of 0.5–2.0 cm. The aggregate is filled in layers and gradually. The jet grouting solidified body 8-2 is a solidified body formed by high-pressure jet grouting into the wall of the pile hole 8. The grouting solidified body 8-1 and the jet grouting solidified body 8-2 solidify simultaneously and become a whole.

[0022] At least one anti-buoyancy steel bar 4 is embedded inside the grouting solidified body 8-1, and the lower end of each anti-buoyancy steel bar 4 is fixedly connected to the pile head 1. The pile head 1 is used to reduce the resistance of inserting the anti-buoyancy steel bar 4 into the pile hole 8, and also has a guiding function. The pile head 1 can be conical, such as conical or pyramidal; or, the pile head 1 can be vertically divided into upper and lower sections, with the lower section of the pile head 1 being conical or pyramidal, and the upper section of the pile head 1 being cylindrical or a frustum shape with a larger bottom and a smaller top, and the diameter of the cylinder is not greater than the diameter of the pile hole 8, and the diameter of the bottom surface of the frustum is not greater than the diameter of the pile hole 8. Dividing the pile head 1 into two sections, with the upper section of the pile head 1 being a frustum shape with a larger bottom and a smaller top, facilitates the reduction of frictional resistance when inserting the anti-buoyancy steel bar 4 into the pile hole 8. There are no specific requirements for the material of the pile head 1, as long as the hardness and strength are sufficient, it can be made of metal or reinforced concrete. To reduce the cost of pile head 1 and improve the flatness of its surface, pile head 1 includes an outer shell 1-2 and reinforced concrete 1-3 inside the outer shell 1-2. The outer shell 1-2 is preferably made of metal, such as sheet metal. The outer shell 1-2 serves as a casting template and also improves the flatness of the pile head 1 surface. The reinforcement of the reinforced concrete 1-3 can be arranged radially along the pile head 1 and fixedly connected to the outer shell 1-2.

[0023] At least two connecting bolts 1-1 are provided circumferentially on the top surface of the pile head 1, with each connecting bolt 1-1 arranged in a circular direction. For example, the lower section of the connecting bolt 1-1 is embedded in the reinforced concrete 1-3 inside the outer shell 1-2, while the upper section of the connecting bolt 1-1 protrudes from the top surface of the pile head 1. The connecting bolt 1-1 can also be welded to the reinforcing bars inside the reinforced concrete 1-3, or to the outer shell 1-2, to ensure the accurate positioning of the connecting bolt 1-1 and improve its stability.

[0024] During the construction of high-pressure jet grouting anti-buoyancy piles, high-pressure jet grouting is performed after the pile hole is formed. Before the jet grout solidifies, each anti-buoyancy steel bar 4 is connected to the pile head 1 and placed into its predetermined position within the pile hole 8. To ensure the anti-buoyancy steel bars 4 and pile head 1 are smoothly placed into their predetermined positions within the pile hole 8, a casing 2 and a fixing rod 3 are required. (See also...) Figure 2 The lower end of the casing 2 is provided with connecting rings 2-1 corresponding to the connecting bolts 1-1 of the pile head 1. The connecting rings 2-1 can be located either on the outside or inside of the casing 2. Figure 1 and Figure 2In the illustrated embodiment, the connecting ring 2-1 is located on the outside of the casing 2. The lower end of the casing 2 is placed on the top surface of the pile head 1, and each connecting bolt 1-1 is inserted into each connecting ring 2-1, achieving a preliminary connection between the lower end of the casing 2 and the upper end of the pile head 1. The fixing rod 3 is used to temporarily fix the lower end of the casing 2 to the top surface of the pile head 1. The number of fixing rods 3 is the same as the number of connecting bolts 1-1, and the length of each fixing rod 3 is the same as the length of the casing 2. The lower end of each fixing rod 3 is provided with a threaded hole that matches the connecting bolt 1-1. Each connecting ring 2-1 is fastened to the pile head 1 through the fixing rod 3. The number of connecting bolts 1-1, the number of connecting rings 2-1, and the number of fixing rods 3 are equal. The number of fixing rods 3 is generally 2 to 4, and each fixing rod 3 is evenly arranged along the circumference of the casing 2. The fixing rod 3 and the connecting ring 2-1 can be located either inside or outside the casing 2. To avoid the fixing rod 3 occupying the internal space of the casing 2 and thus affecting the filling of aggregate into the casing 2, the fixing rod 3 is preferably located outside the casing 2, and the connecting ring 2-1 is provided on the outer side of the lower end of the casing 2. To prevent the fixing rod 3 from tilting during construction, a fixing ring is also provided on the inner or outer wall of the casing 2. The inner diameter of the fixing ring is adapted to the outer diameter of the fixing rod 3, and the fixing rod 3 passes through the fixing ring with a clearance fit. The fixing ring makes the center line of the casing 2 coincide with the center line of the fixing rod 3. The casing 2 is generally a steel cylinder, and the shape of the casing 2 in the horizontal cross section can be any polygon. Since the pile hole 8 is generally circular, the casing 2 is generally a steel cylinder. The whole assembly inserted into the pile hole, including the pile head 1, the anti-buoyancy steel bar 4, the casing 2, and the fixing rod 3, is called the anti-buoyancy anchor bolt construction device. One embodiment of the anti-buoyancy anchor bolt construction device is as follows: Figure 2 As shown.

[0025] The anti-buoyancy anchor installation device is inserted into the predetermined position in the pile hole by hammering or pressing down the upper end of the casing 2. Then, aggregate, such as pebbles, is filled into the casing 2. The fixing rod 3 is then loosened, and the fixing rod 3 and casing 2 are pulled out of the pile hole 8. An appropriate amount of pebbles is added to the pile hole 8. Finally, grout, such as cement grout, is injected into the pile hole 8. The aggregate, such as pebbles, the anti-buoyancy steel bar 4, the embedded steel bar 5, and the grout are consolidated into a grouting solidified body 8-1. The grouting solidified body 8-1 and the jet grouting solidified body 8-2 formed by high-pressure jet grouting to the hole wall of the pile hole 8 form a whole.

[0026] At least one anti-buoyancy reinforcement bar 4 is provided, and the lower end of each anti-buoyancy reinforcement bar 4 is fixedly connected to the pile head 1. The anti-buoyancy reinforcement bar 4 is firmly connected to the pile head 1. The anti-buoyancy reinforcement bar 4 can be directly embedded in the concrete inside the pile head 1, or the pile head 1 can be provided with a joint for connecting to the anti-buoyancy reinforcement bar 4. For example, see Figure 1 and Figure 2A connecting bar 1-4 is provided at the center of the top surface of the pile head 1. The number of connecting bars 1-4 is equal to the number of anti-buoyancy steel bars 4. The lower section of each connecting bar 1-4 is fixed inside the pile head 1, for example, the lower section of the connecting bar 1-4 is fixedly connected to the reinforcement of the reinforced concrete 1-3 inside the pile head 1. The upper section of each connecting bar 1-4 protrudes from the top surface of the pile head 1. The lower end of each anti-buoyancy steel bar 4 is fixedly connected to the upper end of each connecting bar 1-4. The connecting bars 1-4 and the anti-buoyancy steel bars 4 can be welded together or mechanically connected by other means. For example, the connecting bars 1-4 and the anti-buoyancy steel bars 4 are fixedly connected by a connecting sleeve 6. The upper end of the connecting bar 1-4 and the lower end of the anti-buoyancy steel bar 4 connected to it are located in the openings at both ends of the same connecting sleeve 6 and are threaded or welded together. Figure 1 and Figure 2 As shown.

[0027] The anti-buoyancy reinforcement 4 is generally composed of multiple bars, forming an anti-buoyancy reinforcement bundle. Ideally, each anti-buoyancy reinforcement 4 should be arranged along the centerline of the pile hole 8. To ensure that the anti-buoyancy reinforcement 4 remains aligned with the centerline of the casing 2 throughout construction, at least one positioning ring 7 is fitted around the outside of each anti-buoyancy reinforcement 4. The diameter of the positioning ring 7 is matched to the diameter of the pile hole 8. Each anti-buoyancy reinforcement 4 is fixedly connected to the positioning ring 7 and located near the centerline of the pile hole 8. The positioning ring 7 serves to fix the anti-buoyancy reinforcement 4 near the centerline of the casing 2, ultimately achieving the goal of placing the anti-buoyancy reinforcement 4 near the centerline of the pile hole 8. There are generally multiple positioning rings 7, arranged at vertical intervals. See, for example... Figure 3 The positioning ring 7 has an outer ring 7-1, a middle ring 7-2, and an inner ring 7-3 on the horizontal plane. The outer ring 7-1 is clearance-fitted with the wall of the pile hole 8, and also clearance-fitted with the inner wall of the casing 2. The shape of the outer ring 7-1 matches the shapes of the casing 2 and the pile hole 8. The outer ring 7-1 and the middle ring 7-2 are connected by at least one connecting rod 7-4, and the middle ring 7-2 and the inner ring 7-3 are connected by at least one connecting rod 7-4. The connecting rods 7-4 make the outer ring 7-1, the middle ring 7-2, and the inner ring 7-3 a whole. The outer ring 7-1, the middle ring 7-2, and the inner ring 7-3 are concentric circles. The anti-buoyancy reinforcement 4 is fixed between the middle ring 7-2 and the inner ring 7-3. The spacing between the middle ring 7-2 and the inner ring 7-3 is preferably consistent with the diameter of the anti-buoyancy reinforcement 4, thereby fixing the position of the anti-buoyancy reinforcement 4. The inner hole of the inner ring 7-3 can be used to arrange the grouting pipe.

[0028] Each anti-buoyancy reinforcing bar 4 has at least one embedded reinforcing bar 5 fixed to its outer periphery. Both the anti-buoyancy reinforcing bar 4 and the embedded reinforcing bar 5 are completely located within the casing 2. Ultimately, both the anti-buoyancy reinforcing bar 4 and the embedded reinforcing bar 5 are completely located within the cast-in-place solidified body 8-1, thereby increasing the strength of the cast-in-place solidified body 8-1 and thus enhancing the pull-out resistance of the anti-buoyancy reinforcing bar 4. The embedded reinforcing bar 5 can be directly fixed to the outer periphery of the anti-buoyancy reinforcing bar 4. For easier installation of the embedded reinforcing bar 5, please refer to [reference needed]. Figure 4 The embedded reinforcing bar 5 includes a fixed cylinder 5-1 and at least one reinforcing bar segment 5-2 fixed to the outer wall of the fixed cylinder 5-1. The anti-buoyancy reinforcing bar 4 passes through the fixed cylinder 5-1 and is welded and fixed. The reinforcing bar segment 5-2 is perpendicular to the anti-buoyancy reinforcing bar 4, or the end of the reinforcing bar segment 5-2 away from the anti-buoyancy reinforcing bar 4 is inclined upward.

Claims

1. A high-pressure jet grouting anti-buoyancy pile structure, wherein the bottom of the pile hole (8) is a pile head (1) inserted into the pile hole (8), the inside of the pile hole (8) is a grouting solidified body (8-1), and the outside of the pile hole (8) is a jet grouting solidified body (8-2). The grouting solidified body (8-1) is a solidified body formed by filling the pile hole (8) with aggregate and grouting, and the jet grouting solidified body (8-2) is a solidified body formed by high-pressure jet grouting to the hole wall of the pile hole (8). The grouting solidified body (8-1) and the jet grouting solidified body (8-2) are a whole; characterized in that: The top surface of the pile head (1) is provided with at least two connecting bolts (1-1) along the circumferential direction. Each connecting bolt (1-1) is arranged along the circumferential direction. At least one anti-buoyancy steel bar (4) is also embedded inside the grouting solidified body (8-1). The lower end of each anti-buoyancy steel bar (4) is fixedly connected to the pile head (1). At least one section of embedded steel bar (5) is fixed to the outer periphery of each anti-buoyancy steel bar (4). The anti-buoyancy steel bar (4) and the embedded steel bar (5) are both located inside the grouting solidified body (8-1). The embedded steel bar (5) includes a fixed cylinder (5-1) and at least one steel bar segment (5-2) fixed to the outer wall of the fixed cylinder (5-1). The anti-buoyancy steel bar (4) passes through the fixed cylinder (5-1) and is welded and fixed. The steel bar segment (5-2) is perpendicular to the anti-buoyancy steel bar (4), or the end of the steel bar segment (5-2) away from the anti-buoyancy steel bar (4) is inclined upward.

2. The high-pressure jet grouting anti-buoyancy pile structure as described in claim 1, characterized in that: The pile hole (8) is arranged vertically and penetrates the upper hard stratum into the lower soft stratum. The pile hole (8) also penetrates the soft stratum and reaches or enters the pebble layer or bedrock layer below the soft stratum. The hard stratum is the pebble layer and the soft stratum is the sand layer.

3. The high-pressure jet grouting anti-buoyancy pile structure as described in claim 1, characterized in that: The pile head (1) is made of metal, or the pile head (1) includes a shell (1-2) and reinforced concrete (1-3) inside the shell (1-2). The lower part of the connecting bolt (1-1) is embedded in the reinforced concrete (1-3) inside the shell (1-2), and the upper part of the connecting bolt (1-1) is exposed on the top surface of the pile head (1).

4. The high-pressure jet grouting anti-buoyancy pile structure as described in claim 1, characterized in that: The pile head (1) is divided into two vertical sections. The lower section of the pile head (1) is conical or pyramidal, and the upper section of the pile head (1) is cylindrical or frustum-shaped with a larger bottom and a smaller top. The diameter of the cylinder is not greater than the diameter of the pile hole (8), and the diameter of the bottom surface of the frustum is not greater than the diameter of the pile hole (8).

5. The high-pressure jet grouting anti-buoyancy pile structure as described in claim 1, characterized in that: A connecting bar (1-4) is provided at the center of the top surface of the pile head (1). The number of connecting bars (1-4) is equal to the number of anti-buoyancy bars (4). The lower section of each connecting bar (1-4) is fixed inside the pile head (1), and the upper section of each connecting bar (1-4) is exposed on the top surface of the pile head (1). The lower end of each anti-buoyancy bar (4) is fixedly connected to the lower end of each connecting bar (1-4).

6. The high-pressure jet grouting anti-buoyancy pile structure as described in claim 5, characterized in that: The connecting bar (1-4) and the anti-buoyancy bar (4) are fixedly connected by the connecting sleeve (6). The upper end of the connecting bar (1-4) and the lower end of the anti-buoyancy bar (4) connected to it are located in the openings at both ends of the same connecting sleeve (6) and are connected by thread or welding.

7. A high-pressure jet grouting anti-buoyancy pile structure as described in any one of claims 1 to 6, characterized in that: At least one positioning ring (7) is also fitted on the outside of the anti-buoyancy steel bar (4). The diameter of the positioning ring (7) is matched with the diameter of the pile hole (8). Each anti-buoyancy steel bar (4) is fixedly connected to the positioning ring (7) and located near the center line of the pile hole (8).

8. The high-pressure jet grouting anti-buoyancy pile structure as described in claim 7, characterized in that: The positioning ring (7) has an outer ring (7-1), a middle ring (7-2) and an inner ring (7-3) on the horizontal plane. The outer ring (7-1) is fitted with the hole wall of the pile hole (8) with a clearance. The outer ring (7-1) and the middle ring (7-2) are connected by at least one connecting rod (7-4). The middle ring (7-2) and the inner ring (7-3) are connected by at least one connecting rod (7-4). The middle ring (7-2) and the inner ring (7-3) are concentric circles. The anti-buoyancy steel bar (4) is fixed between the middle ring (7-2) and the inner ring (7-3).

9. A high-pressure jet grouting anti-buoyancy pile structure as described in any one of claims 1 to 6, characterized in that: The aggregate in the grouting solidified body (8-1) is pea gravel with a diameter of 0.5 to 2.0 cm.

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