Anti-floating anchor rod construction device

Abstract

The utility model discloses an anti-floating anchor rod construction device, relates to the field of foundations, and solves the problem that an anti-floating anchor rod is difficult to accurately insert into a preset position during construction. According to the technical scheme, the anti-floating anchor rod construction device comprises a pile head, a pile casing, a fixing rod and an anti-floating steel bar, connecting bolts are arranged on the top face of the pile head, connecting rings in one-to-one correspondence with the connecting bolts are arranged at the lower end of the pile casing, the connecting bolts are sleeved with the connecting rings respectively, threaded holes matched with the connecting bolts are formed in the lower end of the fixing rod, and the anti-floating steel bar is arranged in the threaded holes. The connecting ring is fixedly connected with the pile head through a fixing rod; the number of the anti-floating reinforcing steel bars is at least one, the lower ends of the anti-floating reinforcing steel bars are fixedly connected with the pile head, the embedded reinforcing steel bars are fixed to the peripheries of the anti-floating reinforcing steel bars, and the maximum upward pulling force capable of being borne by the anti-floating reinforcing steel bars is improved through the embedded reinforcing steel bars. The anti-floating steel bars and the embedded steel bars are all located in the pile casing, and the embedded steel bars do not affect downward insertion construction of the anti-floating anchor rod at all. 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 to an anti-buoyancy anchor bolt construction device for constructing anti-buoyancy piles. 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 invention provides an anti-buoyancy anchor bolt construction device, which solves the problem of difficulty in accurately inserting the anti-buoyancy anchor bolt into the predetermined position during construction.

[0005] The technical solution adopted in this utility model is as follows: an anti-buoyancy anchor construction device, including a pile head, a casing, a fixing rod, and anti-buoyancy reinforcement bars. The top surface of the pile head is provided with at least two connecting bolts along the circumferential direction. The lower end of the casing is provided with connecting rings corresponding to the connecting bolts. The lower end of the casing is placed on the top surface of the pile head, and each connecting bolt is inserted into each connecting ring. The number of fixing rods is the same as the number of connecting bolts, and the length of each fixing rod is the same as the length of the casing. The lower end of each fixing rod is provided with a threaded hole adapted to the connecting bolt. Each connecting ring is fastened to the pile head through the fixing rod. There is at least one anti-buoyancy reinforcement bar, and the lower end of each anti-buoyancy reinforcement bar is fixedly connected to the pile head. At least one section of embedded reinforcement bar is fixed to the outer periphery of each anti-buoyancy reinforcement bar. Each anti-buoyancy reinforcement bar and each section of embedded reinforcement bar are located inside the casing.

[0006] To facilitate the installation of the anti-buoyancy anchor device and reduce the cost of the pile head, the following further design is implemented: the lower section of the pile head is conical, the top surface of the pile head is circular, the pile head includes an outer shell and reinforced concrete inside the outer shell, the lower section of the connecting bolt is embedded in the reinforced concrete inside the outer shell, and the upper section of the connecting bolt protrudes from the top surface of the pile head.

[0007] To further reduce the frictional resistance experienced by the casing during insertion, the pile head is further divided into two vertical sections: the lower section is conical and the upper section is a frustum shape with a larger bottom and a smaller top, with the bottom surface of the cone overlapping the bottom surface of the frustum.

[0008] 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.

[0009] The embedded reinforcing bars are ultimately embedded into the pile body of the anti-buoyancy pile, which enhances the pull-out resistance that the anti-buoyancy reinforcing bars can withstand. 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 bars pass through the fixing cylinder and are welded and fixed. The reinforcing bar segment is perpendicular to the anti-buoyancy reinforcing bars, or the end of the reinforcing bar segment away from the anti-buoyancy reinforcing bars is inclined upward.

[0010] The anti-buoyancy reinforcement is usually in multiple strands, and it is best to arrange them along the centerline of the casing. To further ensure the anti-buoyancy reinforcement is arranged along the centerline of the casing, at least one positioning ring is fitted around the outside of the anti-buoyancy reinforcement. This positioning ring has an outer ring, a middle ring, and an inner ring in the horizontal plane. The outer ring is clearance-fitted to the inner wall of the casing. The outer ring and the middle ring are connected by at least one connecting rod, and 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, and the anti-buoyancy reinforcement is fixed between the middle ring and the inner ring.

[0011] The fixing rod can be located inside or outside the casing. To avoid the fixing rod occupying the internal space of the casing and thus affecting the filling of aggregate into the casing, the casing is further designed as a steel cylinder with a connecting ring on the outer side of the lower end, and the fixing rod is located on the outer side of the casing.

[0012] The fixing rods are used to temporarily fix the lower end of the casing to the top surface of the pile head. To simplify construction, the number of fixing rods is further increased to 2 to 4, and each fixing rod is evenly arranged along the circumference of the casing.

[0013] To prevent the fixing rod from tilting during construction, a further step is to install a fixing ring on the inner or outer wall of the casing, through which the fixing rod passes.

[0014] The beneficial effects of this utility model's anti-buoyancy anchor construction device are as follows: After the pile hole is formed, a high-pressure jet grouting operation is performed. Before the high-pressure jet grout solidifies, the anti-buoyancy anchor construction device is inserted into the predetermined position in the pile hole. Then, aggregate, such as pebbles, is filled into the casing. The fixing rod is then loosened, and both the fixing rod and the casing can be removed from the pile hole. Finally, grout, such as cement grout, is injected into the pile hole. Some of the aggregate and grout diffuse into the stratum outside the pile hole. The anti-buoyancy steel bars, embedded steel bars, and grout solidify into a grouting solidified body, which becomes a whole with the jet grouting solidified body formed by the high-pressure jet grouting. The anti-buoyancy steel bars and embedded steel bars are located within the grouting solidified body, and the grouting solidified body and the jet grouting solidified body are a whole, therefore the anti-buoyancy steel bars can withstand a large pull-out force. Both the anti-buoyancy steel bars and embedded steel bars are located inside the casing, and the lower end of the anti-buoyancy steel bars is fixedly connected to the pile head. The embedded steel bars do not affect the insertion of the anti-buoyancy anchor. The pile head and casing are connected. By pressing down or hammering the upper end of the casing, the entire anti-buoyancy anchor installation device can be inserted to a predetermined depth, ensuring that the pile head is inserted into the predetermined position within the pile hole. This invention improves the pile formation quality of anti-buoyancy piles and enhances the pull-out resistance that anti-buoyancy reinforcement can withstand. Attached Figure Description

[0015] Figure 1 This is a structural schematic diagram of one embodiment of the anti-buoyancy anchor bolt construction device of this utility model.

[0016] Figure 2 yes Figure 1A structural schematic diagram on the horizontal section corresponding to the positioning ring.

[0017] Figure 3 This is a schematic diagram illustrating an example of the embedded reinforcing steel in the anti-buoyancy anchor bolt construction device of this utility model.

[0018] 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. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings.

[0020] This utility model relates to an anti-buoyancy anchor construction device, which directly constructs an anti-buoyancy anchor within the pile hole. For example... Figure 1 As shown, the anti-buoyancy anchor bolt construction device includes a pile head 1, a casing 2, a fixing rod 3, and anti-buoyancy reinforcing bars 4. The lower end of the pile head 1 is conical, generally conical, but can also be pyramidal to facilitate the insertion of the anti-buoyancy anchor bolt construction device. For example, the lower section of the pile head 1 is conical, and the top surface of the pile head 1 is circular. To reduce friction between the anti-buoyancy anchor bolt construction device and the pile hole wall during insertion, the pile head 1 is vertically divided into upper and lower sections. The lower section is conical, and the upper section is a frustum shape with a larger bottom and a smaller top, with the base of the cone overlapping the bottom surface of the frustum. Figure 1 As shown. The pile head 1 has no specific material requirements, as long as its hardness and strength are sufficient; it can be made of metal or reinforced concrete. To reduce the cost of the pile head 1 and improve the flatness of its surface, the 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 acts as a casting template and also improves the flatness of the pile head 1's 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. At least two connecting bolts 1-1 are provided circumferentially on the top surface of the pile head 1. 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, and the upper section of the connecting bolt 1-1 protrudes from the top surface of the pile head 1. The connecting bolts 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 bolts 1-1 and improve their stability.

[0021] The lower end of the casing 2 is provided with connecting rings 2-1 corresponding to the connecting bolts 1-1. The connecting rings 2-1 can be located either on the outside or inside of the casing 2. Figure 1In 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 to connect the lower end of the casing 2 to 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 on the outside of 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 2-2 is also provided on the inner or outer wall of the casing 2. The inner diameter of the fixing ring 2-2 is adapted to the outer diameter of the fixing rod 3, and the fixing rod 3 passes through the fixing ring 2-2 with a clearance fit. The fixing ring 2-2 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 horizontal cross-section of the casing 2 can be any polygon. Since the pile hole is generally circular, the casing 2 is generally a steel cylinder.

[0022] 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 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 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 As shown.

[0023] 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 casing 2. 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 positioning ring 7 serves to fix the anti-buoyancy reinforcement 4 near the centerline of the casing 2. There are generally multiple positioning rings 7, arranged at vertical intervals. See, for example... Figure 2 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 inner wall of the casing 2. The shape of the outer ring 7-1 is adapted to the shape of the casing 2, and is generally circular. 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 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.

[0024] 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 located inside the casing 2. The embedded reinforcing bar 5 is ultimately embedded into the pile body of the anti-buoyancy pile, thereby increasing the pull-out resistance that the anti-buoyancy reinforcing bar 4 can withstand. The embedded reinforcing bar 5 can be directly fixed to the outer periphery of the anti-buoyancy reinforcing bar 4. For ease of installation of the embedded reinforcing bar 5, please refer to... Figure 3 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.

[0025] 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 grout solidifies, the anti-buoyancy anchor installation device is inserted into the predetermined position in the pile hole. Then, aggregate, such as pebbles, with a diameter of 0.5–2.0 cm, is filled into the casing 2. The filling is done in layers, gradually to ensure uniform and dense filling of the pebbles and avoid voids. Next, the fixing rod 3 is loosened, and the fixing rod 3 and casing 2 are pulled out of the pile hole. An appropriate amount of pebbles is then added to the pile hole. Finally, grout, such as cement grout, is injected into the pile hole. The aggregate, such as pebbles, the anti-buoyancy steel bars 4, the embedded steel bars 5, and the grout solidify into a grouting solidified body. This grouting solidified body solidifies synchronously with the jet grouting solidified body formed by the high-pressure jet grouting into the pile hole wall, forming a unified whole.

Claims

1. An anti-buoyancy anchor bolt construction device, characterized in that: The structure includes a pile head (1), a casing (2), fixing rods (3), and anti-buoyancy reinforcement (4). The top surface of the pile head (1) is provided with at least two connecting bolts (1-1) circumferentially. The lower end of the casing (2) is provided with connecting rings (2-1) corresponding to the connecting bolts (1-1). 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 its respective connecting ring (2-1). The number of fixing rods (3) is the same as the number of connecting bolts (1-1). Each fixing rod (3)... The length of each of the fixed rods (3) is consistent with the length of the casing (2). The lower end of each fixed 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 fixed rod (3). There is at least one anti-buoyancy steel bar (4). 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 on the outer periphery of each anti-buoyancy steel bar (4). Each anti-buoyancy steel bar (4) and each section of embedded steel bar (5) are located inside the casing (2).

2. The anti-buoyancy anchor bolt construction device as described in claim 1, characterized in that: The lower section of the pile head (1) is conical, and the top surface of the pile head (1) is circular. The pile head (1) includes an outer shell (1-2) and reinforced concrete (1-3) inside the outer shell (1-2). The lower section of the connecting bolt (1-1) is embedded in the reinforced concrete (1-3) inside the outer shell (1-2), and the upper section of the connecting bolt (1-1) protrudes from the top surface of the pile head (1).

3. The anti-buoyancy anchor bolt construction device as described in claim 1, characterized in that: The pile head (1) is vertically divided into two sections, the lower section is conical and the upper section is a frustum with a larger bottom and a smaller top, and the bottom surface of the cone overlaps with the bottom surface of the frustum.

4. The anti-buoyancy anchor bolt construction device 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).

5. The anti-buoyancy anchor bolt construction device as described in claim 4, characterized in that: The connecting bar (1-4) and the anti-buoyancy bar (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 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.

6. The anti-buoyancy anchor bolt construction device according to any one of claims 1 to 5, characterized in that: 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.

7. The anti-buoyancy anchor bolt construction device according to any one of claims 1 to 5, characterized in that: At least one positioning ring (7) is also fitted on the outside of the anti-buoyancy steel bar (4). 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 inner wall of the casing (2) 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).

8. The anti-buoyancy anchor bolt construction device according to any one of claims 1 to 5, characterized in that: The casing (2) is a steel cylinder. A connecting ring (2-1) is provided on the outer side of the lower end of the casing (2), and the fixing rod (3) is located on the outer side of the casing (2).

9. The anti-buoyancy anchor bolt construction device according to any one of claims 1 to 5, characterized in that: The number of fixing rods (3) is 2 to 4, and each fixing rod (3) is evenly arranged along the circumference of the casing (2).

10. The anti-buoyancy anchor bolt construction device according to any one of claims 1 to 5, characterized in that: The inner or outer wall of the casing (2) is also provided with a fixing ring (2-2), and the fixing rod (3) passes through the fixing ring (2-2).

Images