An internal pilot hole anti-collapse device suitable for deep foundation pits

Abstract

This utility model discloses an internal borehole anti-collapse device suitable for deep foundation pits, comprising land, a pile hole at the center of the land, a central column at the center of the pile hole, a conical groove at the center of the top of the central column, and movable grooves on all four sides of the conical groove near the top and bottom. Movable plates are slidably connected inside the movable grooves, with one end of each of the four movable plates being arc-shaped and the other ends of each of the four movable plates extending to the outside of the central column and fixedly connected to an arc-shaped outer plate. This internal borehole anti-collapse device for deep foundation pits has the following advantages: strong self-adaptive support capability: by setting up structures such as arc-shaped abutment plates, return springs, and movable plates, the device can automatically adjust the support position according to the actual inner diameter of the pile hole, achieving a tight fit with the hole wall and adapting to different hole diameters and soil layer changes.

Description

Technical Field

[0001] This utility model relates to the technical field of internal pilot hole anti-collapse device, specifically an internal pilot hole anti-collapse device suitable for deep foundation pits. Background Technology

[0002] In deep foundation pit construction, it is often necessary to drill pile holes in the soil layer for pile foundation construction.

[0003] However, due to factors such as unstable soil structure, groundwater seepage, or construction vibration, pile holes are prone to collapse, seriously affecting construction safety and progress. Currently common anti-collapse measures include the use of steel casings, concrete retaining walls, or grouting reinforcement. While these methods have some effect, they still have the following problems: steel casings are complex to install and costly; concrete retaining walls require long curing times, affecting the construction period; grouting reinforcement has poor adaptability to soil layers and is prone to uneven support. Furthermore, existing anti-collapse devices mostly rely on external supports, making it difficult to form a uniform and self-adaptive support structure within the hole. Especially in deep foundation pits, where pile hole depth is large and soil layer variations are complex, traditional devices often cannot flexibly adapt to different hole diameters and soil conditions, resulting in unsatisfactory support effects. Utility Model Content

[0004] The purpose of this invention is to provide an internally pilot-hole anti-collapse device suitable for deep foundation pits, to solve the problems mentioned in the background art. Common anti-collapse measures include the use of steel casings, concrete walls, or grouting reinforcement. Although these methods have certain effects, they still have the following problems: steel casings are complex to install and costly; concrete walls have long curing times, affecting the construction period; grouting reinforcement has poor adaptability to soil layers and is prone to uneven support. In addition, existing anti-collapse devices mostly rely on external support, making it difficult to form a uniform and adaptive support structure in the hole. Especially in deep foundation pits, where the pile hole depth is large and the soil layer changes are complex, traditional devices often cannot flexibly adapt to different hole diameters and soil conditions, resulting in unsatisfactory support effects.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an internal borehole anti-collapse device suitable for deep foundation pits, comprising land, a pile hole being formed in the center of the land, a central column being set in the center of the pile hole, a conical groove being formed in the center of the top of the central column, and movable grooves being formed on the four sides of the conical groove near the top and bottom, movable plates being slidably connected inside the movable grooves, the opposite ends of the four movable plates being designed as arcs, and the opposite ends of the four movable plates penetrating to the outside of the central column and being fixedly connected to an arc-shaped outer plate, a fixed seat being fixedly connected to the center of the side of the arc-shaped outer plate away from the movable plates, and the fixed seat having an internal opening The device has a sliding groove, with a sliding plate slidably connected to the center of the sliding groove. A connecting rod is fixedly connected to one side of the sliding plate. One side of the connecting rod extends through to the outside of the fixed seat and is fixedly connected to a connecting plate. An arc-shaped abutment is fixedly connected to the side of the connecting plate away from the connecting rod. The side of the arc-shaped abutment away from the connecting plate contacts the inner wall of the pile hole. A return spring is sleeved on the outside of the connecting rod. The two ends of the return spring are fixedly connected to the fixed seat and the connecting plate, respectively. A central cone is provided at the top of the central column. The bottom of the central cone extends through to the inside of the cone groove and extends to the bottom of the cone groove. The outer surface of the central cone contacts the arc-shaped end face of the movable plate.

[0006] Compared with the prior art, the beneficial effects of this utility model are: This internal pilot hole anti-collapse device, suitable for deep foundation pits, has the following beneficial effects: I. Strong Adaptive Support Capability: By incorporating structures such as an arc-shaped abutment plate, a return spring, and a movable plate, the device can automatically adjust the support position according to the actual inner diameter of the pile hole, achieving a tight fit with the hole wall and adapting to different hole diameters and soil layer variations. II. Uniform and Stable Support: The arc-shaped abutment plate is connected to the fixed seat via a connecting plate, connecting rod, and sliding plate. Under the action of the return spring, it forms a uniform outward pushing force, ensuring even distribution of support force and effectively preventing localized hole collapse. III. Simple Structure and Convenient Installation: The central column and central cone adopt a conical mating structure. By pressing down on the central cone, the movable plate can be pushed outward, driving the arc-shaped outer plate and... The curved support plate unfolds easily, requiring no complex equipment; fourth, reliable support and anti-displacement: the support groove, support slider, and support rod enhance the longitudinal stability of the curved outer plate; the design of the limit groove and limit block prevents the movable plate from detaching or shifting during movement; fifth, reusable and easy to maintain: the main structure of the device is detachable, and the central cone can be easily removed through the pull ring and top plate, facilitating disassembly and reuse and reducing construction costs; sixth, dustproof and dirt-proof design: a folding cover is provided between the fixed seat and the connecting plate to prevent mud and debris from entering the sliding groove, ensuring the normal operation of the return spring and sliding plate. Attached Figure Description

[0007] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a cross-sectional view of the structure of this utility model; Figure 3 This utility model Figure 2 A magnified view of part A in the diagram; Figure 4 This utility model Figure 2 A magnified view of part B in the diagram; Figure 5 This is a three-dimensional structural view of the central column of this utility model; Figure 6 This is a three-dimensional view of the arc-shaped abutment plate of this utility model.

[0008] In the diagram: 1. Land; 2. Pile hole; 3. Central column; 4. Conical groove; 5. Central cone; 6. Movable groove; 7. Arc-shaped outer plate; 8. Movable plate; 9. Support groove; 10. Support rod; 11. Support slider; 12. Limiting groove; 13. Limiting block; 14. Connecting plate; 15. Arc-shaped abutment plate; 16. Fixed seat; 17. Sliding groove; 18. Sliding plate; 19. Connecting rod; 20. Return spring; 21. Folding cover; 22. Telescopic rod; 23. Top plate; 24. Pull ring; 25. Positioning plate; 26. Limiting plate. Detailed Implementation

[0009] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0010] Please see Figure 1-6This utility model provides a technical solution: an internal borehole anti-collapse device suitable for deep foundation pits, including land 1, a pile hole 2 is opened in the center of the land 1, a central column 3 is set in the center of the pile hole 2, a conical groove 4 is opened in the center of the top of the central column 3, and movable grooves 6 are opened on the four sides of the conical groove 4 near the top and near the bottom. Movable plates 8 are slidably connected inside the movable grooves 6. The opposite ends of the four movable plates 8 are all designed to be arc-shaped, and the opposite ends of the four movable plates 8 all penetrate to the outside of the central column 3 and are fixedly connected to an arc-shaped outer plate 7. A fixed seat 16 is fixedly connected to the center of the side of the arc-shaped outer plate 7 away from the movable plates 8. A sliding groove 17 is opened inside the fixed seat 16. A sliding plate 18 is slidably connected to the center of the inner core. A connecting rod 19 is fixedly connected to one side of the sliding plate 18. One side of the connecting rod 19 extends through to the outside of the fixed seat 16 and is fixedly connected to a connecting plate 14. An arc-shaped abutment 15 is fixedly connected to the side of the connecting plate 14 away from the connecting rod 19. The side of the arc-shaped abutment 15 away from the connecting plate 14 contacts the inner wall of the pile hole 2. A return spring 20 is sleeved on the outside of the connecting rod 19. The two ends of the return spring 20 are fixedly connected to the fixed seat 16 and the connecting plate 14, respectively. A central cone 5 is provided at the top of the central column 3. The bottom of the central cone 5 extends through to the inside of the cone groove 4 and extends to the bottom of the cone groove 4. The outer surface of the central cone 5 contacts the arc-shaped end face of the movable plate 8.

[0011] The center column 3 has support grooves 9 above and below the movable groove 6. A support slider 11 is slidably connected in the center of the support groove 9. A support rod 10 is fixedly connected to one side of the support slider 11. One side of the support rod 10 extends through to the outside of the center column 3 and is fixedly connected to the inner wall of the arc-shaped outer plate 7.

[0012] Telescopic rods 22 are movably connected to the four corners of the outer wall of the arc-shaped outer plate 7. One side of the telescopic rods 22 is movably connected to the inner wall of the arc-shaped abutment plate 15.

[0013] A folding cover 21 is fixedly connected to the outer side of the fixed base 16 and the connecting plate 14.

[0014] A top plate 23 is fixedly connected to the top of the central cone 5. A pull ring 24 is fixedly connected to the center of the top of the top plate 23. Positioning plates 25 are fixedly connected to both sides of the top of the central column 3. The top of the positioning plate 25 extends through to the outside of the top plate 23. Limiting plates 26 are provided on both sides of the top of the top plate 23. One side of the limiting plate 26 extends through to the outside of the positioning plate 25. The bottom of the limiting plate 26 contacts the top of the top plate 23.

[0015] The center of the top and bottom of the movable groove 6 is provided with a limiting groove 12, and the center of the top and bottom of the movable plate 8 is fixedly connected with a limiting block 13. The side of the limiting block 13 away from the movable plate 8 extends through to the center of the limiting groove 12 and is slidably connected to the limiting groove 12.

[0016] Working principle: First, the central column 3 and its connected components, including the arc-shaped outer plate 7 and the arc-shaped abutment plate 15, are placed into the excavated pile hole 2. At this time, under the extension of the return spring 20, the connecting plate 14 drives the arc-shaped abutment plate 15 to move outward, initially contacting the inner wall of the pile hole 2, forming initial support. Then, the central cone 5 is inserted downward along the conical groove 4. Since the outer surface of the central cone 5 contacts the arc-shaped end face of the movable plate 8, as the central cone 5 is gradually pressed down, its conical surface pushes the movable plate 8 to slide outward along the movable groove 6. The outward movement of the movable plate 8 drives the arc-shaped outer plate 7 and the fixed seat 16 fixed to it... The outward displacement forces the connecting plate 14 and the arc-shaped abutment plate 15 to overcome the elastic force of the return spring 20 and press further against the inner wall of the pile hole 2. The rebound force generated after the return spring 20 is compressed continues to act on the connecting plate 14, so that the arc-shaped abutment plate 15 is evenly and stably pressed against the hole wall. After the support is completed, the top plate 23 can be fixed by the positioning plate 25 and the limiting plate 26 to prevent the central cone 5 from loosening. If the device needs to be disassembled, simply remove the limiting plate 26 and lift the pull ring 24 upward to remove the central cone 5. Then the arc-shaped abutment plate 15 retracts under the action of the return spring 20, making it easy to remove the entire device from the pile hole 2.

[0017] In summary, this internal pilot hole anti-collapse device suitable for deep foundation pits has the following beneficial effects: I. Strong Adaptive Support Capability: By incorporating structures such as the arc-shaped abutment plate 15, the return spring 20, and the movable plate 8, the device can automatically adjust the support position according to the actual inner diameter of the pile hole 2, achieving a tight fit with the hole wall and adapting to different hole diameters and soil layer changes. II. Uniform and Stable Support: The arc-shaped abutment plate 15 is connected to the fixed seat 16 via the connecting plate 14, connecting rod 19, and sliding plate 18. Under the action of the return spring 20, it forms a uniform outward pushing force, ensuring even distribution of support force and effectively preventing local hole collapse. III. Simple Structure and Convenient Installation: The central column 3 and the central cone 5 adopt a conical surface mating structure. By pressing down on the central cone 5, the movable plate 8 can be pushed outward, driving the arc-shaped outer plate 7 and the arc-shaped abutment plate 8 to move outward. The plate 15 unfolds easily, requiring no complex equipment; Fourth, reliable support and anti-displacement: the support groove 9, support slider 11 and support rod 10 enhance the longitudinal stability of the arc-shaped outer plate 7; the design of the limiting groove 12 and limiting block 13 prevents the movable plate 8 from coming off or shifting during movement; Fifth, reusable and easy to maintain: the main structure of the device is detachable, and the central cone 5 can be easily removed through the pull ring 24 and the top plate 23, facilitating disassembly and reuse and reducing construction costs; Sixth, dustproof and dirt-proof design: a folding cover 21 is provided between the fixed seat 16 and the connecting plate 14 to prevent mud and debris from entering the sliding groove 17, ensuring the normal operation of the return spring 20 and the sliding plate 18.

[0018] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0019] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An internal borehole anti-collapse device suitable for deep foundation pits, comprising land (1), characterized in that: A pile hole (2) is provided in the center of the land (1). A central column (3) is provided in the center of the pile hole (2). A conical groove (4) is provided in the center of the top of the central column (3). Movable grooves (6) are provided on all four sides of the conical groove (4) near the top and near the bottom. Movable plates (8) are slidably connected inside the movable grooves (6). The opposite ends of the four movable plates (8) are all designed to be arc-shaped. The opposite ends of the four movable plates (8) all penetrate to the outside of the central column (3) and are fixedly connected to an arc-shaped outer plate (7). A fixed seat (16) is fixedly connected to the center of the side of the arc-shaped outer plate (7) away from the movable plate (8). A sliding groove (17) is provided inside the fixed seat (16). A sliding plate (18) is slidably connected to the center of the sliding groove (17). A connecting rod (19) is fixedly connected to one side of the central column (3). One side of the connecting rod (19) extends through to the outside of the fixed seat (16) and is fixedly connected to a connecting plate (14). An arc-shaped abutment (15) is fixedly connected to the side of the connecting plate (14) away from the connecting rod (19). The side of the arc-shaped abutment (15) away from the connecting plate (14) contacts the inner wall of the pile hole (2). A return spring (20) is sleeved on the outside of the connecting rod (19). The two ends of the return spring (20) are fixedly connected to the fixed seat (16) and the connecting plate (14) respectively. A central cone (5) is provided at the top of the central column (3). The bottom of the central cone (5) extends through to the inside of the cone groove (4) and extends to the bottom of the cone groove (4). The outer surface of the central cone (5) contacts the arc-shaped end face of the movable plate (8).

2. The internal pilot hole anti-collapse device for deep foundation pits according to claim 1, characterized in that: The center column (3) has support grooves (9) above and below the corresponding movable groove (6) inside. A support slider (11) is slidably connected in the center of the support groove (9). A support rod (10) is fixedly connected to one side of the support slider (11). One side of the support rod (10) extends through to the outside of the center column (3) and is fixedly connected to the inner wall of the arc-shaped outer plate (7).

3. The internal pilot hole anti-collapse device for deep foundation pits according to claim 1, characterized in that: Telescopic rods (22) are movably connected to the four corners of the outer wall of the arc-shaped outer plate (7), and one side of the telescopic rods (22) is movably connected to the inner wall of the arc-shaped abutment plate (15).

4. The internal pilot hole anti-collapse device for deep foundation pits according to claim 1, characterized in that: A folding cover (21) is fixedly connected to the outer side of the fixed base (16) and the connecting plate (14).

5. The internal pilot hole anti-collapse device for deep foundation pits according to claim 1, characterized in that: The top of the central cone (5) is fixedly connected to a top plate (23), and a pull ring (24) is fixedly connected to the center of the top of the top plate (23). Positioning plates (25) are fixedly connected to both sides of the top of the central column (3). The top of the positioning plate (25) extends through to the outside of the top plate (23). Limiting plates (26) are provided on both sides of the top of the top plate (23). One side of the limiting plate (26) extends through to the outside of the positioning plate (25). The bottom of the limiting plate (26) contacts the top of the top plate (23).

6. The internal pilot hole anti-collapse device for deep foundation pits according to claim 1, characterized in that: The center of the top and bottom of the movable groove (6) is provided with a limiting groove (12), and the center of the top and bottom of the movable plate (8) is fixedly connected with a limiting block (13). The side of the limiting block (13) away from the movable plate (8) extends through to the center of the limiting groove (12) and slides through the limiting groove (12).

Images