A borehole wall support device for rotary pile drilling.

Abstract

This utility model discloses a borehole wall support device for rotary pile drilling, relating to the field of building construction technology. It includes a protective cover plate, a fixed sleeve, and multiple telescopic support components. The fixed sleeve is fixed to the lower end of the protective cover plate, and the multiple telescopic support components are evenly installed on the outer side of the fixed sleeve. A drive mechanism is installed between the protective cover plate and the fixed sleeve to drive the multiple telescopic support components to extend and retract synchronously. This utility model, through the coordinated arrangement of the protective cover plate, fixed sleeve, and telescopic support components, keeps the multiple telescopic support components in a retracted state when the fixed sleeve is inserted into the borehole. This avoids the telescopic support components contacting the borehole wall and causing borehole collapse during insertion. After insertion, the drive mechanism drives the multiple telescopic support components to extend synchronously, allowing the telescopic support components to support the inner wall of the borehole. This effectively prevents the borehole setup from weakening the stability of the surrounding soil layers and provides protection for adjacent buildings.

Description

Technical Field

[0001] This utility model relates to the field of building construction technology, and in particular to a borehole wall support device for rotary pile drilling. Background Technology

[0002] Rotary drilling piles are constructed by drilling a hole using a rotary drilling rig, followed by pouring concrete into the hole to form a pile. The rotary drilling rig drills a hole on the ground and removes the soil layer inside. After drilling, reverse circulation cleaning is required to facilitate subsequent concrete pouring. To ensure the safety of underground structure construction and the surrounding environment of the pile, support measures such as retaining and reinforcement of the hole sidewalls are usually necessary.

[0003] For example, a rotary drilling pile support device disclosed in patent publication number CN109706942B includes a support column, a first support mechanism, and a second support mechanism. Both the first and second support mechanisms are supported on the inner wall of the pile. The first support mechanism is provided with an installation groove. This rotary drilling pile support device uses the first and second support mechanisms, which are arranged vertically, to support the upper and lower parts of the pile sidewall respectively. The positions of the first and second support mechanisms are adjusted to support the inner wall of the pile, thereby improving the stability and reliability of the rotary drilling pile support device. The installation groove on the first support mechanism allows one end of the second support mechanism to move downwards, while the other end is installed in the installation groove. This allows the second and first support mechanisms to jointly support the lower side of the inner wall of the pile, ensuring greater stability and preventing collapse.

[0004] Based on the above search and analysis of existing technologies, it was found that existing borehole wall support devices similar to those disclosed above have poor adjustability, leading to relatively cumbersome operation and reduced construction efficiency. Therefore, a borehole wall support device for rotary pile drilling is proposed to improve the above-mentioned problems. Utility Model Content

[0005] The purpose of this application is to provide a borehole wall support device for rotary pile drilling to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this application provides the following technical solution: a borehole wall support device for rotary drilling pile construction, comprising:

[0007] Protective cover plate;

[0008] A fixing sleeve is provided, which is coaxial with the protective cover and fixed to the lower end of the protective cover.

[0009] The telescopic support assembly consists of multiple telescopic support assemblies, which are evenly installed on the outside of the fixed sleeve. A drive mechanism is installed between the protective cover and the fixed sleeve to drive the multiple telescopic support assemblies to telescopically extend and retract synchronously.

[0010] As a further supplement to this solution, the telescopic support assembly includes a threaded rod, a limiting sleeve, and a limiting slide rod. The threaded rod is horizontally rotatably installed on the side end of the fixed sleeve and passes through the fixed sleeve. The limiting sleeve is horizontally fixed on the outer wall of the fixed sleeve. The limiting slide rod is slidably sleeved on the inner side of the limiting sleeve, and the end of the limiting slide rod away from the fixed sleeve protrudes out of the outer side of the limiting sleeve. The limiting sleeve is threadedly sleeved on the outer side of the threaded rod.

[0011] The drive mechanism includes a drive assembly, a rotating tube, and multiple reversing assemblies. The drive assembly is installed on the upper end of the protective cover and connected to the rotating tube. The rotating tube is coaxially mounted on the inner side of the fixed sleeve. The multiple reversing assemblies are correspondingly installed between the rotating tube and multiple threaded rods.

[0012] As a further supplement to this solution, the reversing assembly includes a driving bevel gear and a driven bevel gear. The driving bevel gear is coaxially fixed on the rotating tube, and the driven bevel gear is coaxially fixed on the threaded rod and meshes with the driving bevel gear.

[0013] As a further supplement to this solution, the drive assembly includes a drive motor, a first bevel gear, and a second bevel gear. The drive motor is mounted on the upper end of the protective cover plate. The first bevel gear is coaxially fixed to the output end of the drive motor. The second bevel gear is coaxially fixed to the rotating tube and meshes with the first bevel gear. A water pipe is installed on the upper end of the rotating tube through a sealing connector, and a water pump is installed on the other end of the water pipe.

[0014] As a further supplement to this solution, the lower end of the fixed sleeve is equipped with a base plate via a connecting flange. The bottom surface of the base plate is integrally provided with a soil-breaking cone. The base plate is hollow and has filter holes on its periphery. The lower end of the rotating tube is connected to the base plate.

[0015] As a further supplement to this solution, the fixed sleeve is provided in multiple sections, and two adjacent fixed sleeve sections are connected by connecting flanges. The ends of the rotating tubes inside the two adjacent fixed sleeves are respectively provided with matching positioning protrusions and positioning recesses.

[0016] As a further supplement to this solution, a support plate is vertically fixed to the end of the limiting slide rod away from the rotating tube.

[0017] In summary, the technical effects and advantages of this utility model are as follows:

[0018] 1. In this utility model, by coordinating the protective cover plate, the fixed sleeve, and the telescopic support components, multiple telescopic support components are kept in a retracted state while the fixed sleeve is inserted into the borehole. This avoids the telescopic support components from contacting the borehole wall and causing the borehole to collapse during insertion. After insertion, the drive mechanism drives multiple telescopic support components to extend synchronously, so that the telescopic support components support the inner wall of the borehole. This effectively avoids the borehole setting from weakening the stability of the surrounding soil layer and provides protection for adjacent buildings.

[0019] 2. In this utility model, by setting up a hollow cover-shaped chassis and a rotating pipe, during the support process, the hollow cover-shaped chassis, in conjunction with the rotating pipe and a water pump, can be used to pump the water from the bottom of the hole upwards to achieve a water reduction effect, which is beneficial to the stable support of the hole. By vertically fixing the support plate at the end of the limiting slide rod away from the rotating pipe, the direct contact area between the support plate and the hole wall can be increased, further improving the support effect. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the overall three-dimensional structure in this embodiment;

[0022] Figure 2 This is a schematic diagram of the disassembled structure of the fixing sleeve in this embodiment;

[0023] Figure 3 This is a schematic diagram of the planar structure in this embodiment;

[0024] Figure 4 This is a schematic diagram of the internal structure of the fixed sleeve in this embodiment;

[0025] Figure 5 This is a schematic diagram of the chassis structure in this embodiment;

[0026] Figure 6 This is a schematic diagram of the structure of the protective cover in this embodiment.

[0027] In the diagram: 1. Protective cover plate; 2. Fixing sleeve; 3. Telescopic support assembly; 31. Threaded rod; 32. Limiting sleeve; 33. Limiting rod; 4. Rotating tube; 5. Driving bevel gear; 6. Driven bevel gear; 7. Support plate; 8. Positioning protrusion; 9. Positioning notch; 10. Connecting flange; 11. Chassis; 12. Soil-breaking cone; 13. Drive motor; 14. First bevel gear; 15. Second bevel gear; 16. Sealing connector. Detailed Implementation

[0028] 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.

[0029] Example: Reference Figure 1-6 The diagram illustrates a borehole wall support device for rotary pile drilling, comprising a protective cover plate 1, a fixed sleeve 2, and telescopic support components 3. The fixed sleeve 2 is coaxially aligned with the protective cover plate 1 and fixed to its lower end. The protective cover plate 1 is located above the borehole and serves to shield it from rain, preventing rainwater from directly entering the borehole. Multiple telescopic support components 3 are evenly distributed on the outer side of the fixed sleeve 2. A drive mechanism is installed between the protective cover plate 1 and the fixed sleeve 2 to synchronously extend and retract the multiple telescopic support components 3. By keeping multiple telescopic support components 3 in a retracted state and inserting the fixed sleeve 2 into the borehole, it is possible to prevent the telescopic support components 3 from contacting the borehole wall and causing the borehole to collapse during insertion. After insertion, the drive mechanism drives multiple telescopic support components 3 to extend synchronously, so that the telescopic support components 3 support the inner wall of the borehole, effectively preventing the borehole setting from weakening the stability of the surrounding soil layer and providing protection for adjacent buildings. Moreover, based on the above-mentioned structural arrangement, it can be seen that the support device has better adjustability and is more convenient to operate, thereby effectively improving construction efficiency.

[0030] Regarding the telescopic support component 3, specifically, as follows: Figure 4As shown, the telescopic support assembly 3 includes a threaded rod 31, a limiting sleeve 32, and a limiting rod 33. The threaded rod 31 is horizontally rotatably mounted on the side end of the fixed sleeve 2 and passes through the fixed sleeve 2. The limiting sleeve 32 is horizontally fixed on the outer wall of the fixed sleeve 2. The limiting rod 33 is slidably sleeved on the inner side of the limiting sleeve 32, and the end of the limiting rod 33 away from the fixed sleeve 2 protrudes from the outer side of the limiting sleeve 32. The limiting sleeve 32 is threadedly sleeved on the outer side of the threaded rod 31. The driving mechanism includes a driving assembly, a rotating tube 4, and multiple reversing assemblies. The driving assembly is mounted on the upper end of the protective cover plate 1 and connected to the rotating tube 4. The rotating tube 4 is coaxially rotatably mounted on the inner side of the fixed sleeve 2. The multiple reversing assemblies are correspondingly installed between the rotating tube 4 and the multiple threaded rods 31.

[0031] Specifically, the reversing assembly includes a driving bevel gear 5 and a driven bevel gear 6. The driving bevel gear 5 is coaxially fixed to the rotating tube 4, and the driven bevel gear 6 is coaxially fixed to the threaded rod 31 and meshes with the driving bevel gear 5.

[0032] Specifically, the drive assembly includes a drive motor 13, a first bevel gear 14, and a second bevel gear 15. The drive motor 13 is mounted on the upper end of the protective cover plate 1. The first bevel gear 14 is coaxially fixed to the output end of the drive motor 13. The second bevel gear 15 is coaxially fixed to the rotating tube 4 and meshes with the first bevel gear 14. A water pipe is installed on the upper end of the rotating tube 4 through a sealing connector 16, and a water pump is installed on the other end of the water pipe.

[0033] Based on the above structural configuration, by keeping multiple telescopic support components 3 in a retracted state and inserting the fixed sleeve 2 into the hole, it is possible to avoid the telescopic support components 3 contacting the hole wall and causing hole collapse during insertion. After insertion, the drive motor 13 is started, and the rotating tube 4 rotates along its axis through the cooperation of the first bevel gear 14 and the second bevel gear 15. The threaded rod 31 rotates along its axis through the cooperation of the driving bevel gear 5 and the driven bevel gear 6. The threaded cooperation between the threaded rod 31 and the limiting slide rod 33, as well as the limiting action between the limiting slide rod 33 and the limiting sleeve 32, allows the limiting slide rod 33 to slide along the limiting sleeve 32, thereby realizing the telescopic action of the limiting slide rod 33.

[0034] To increase the contact area between the support structure and the borehole wall, a support plate 7 is vertically fixed to the end of the limiting slide rod 33 away from the rotating tube 4, which can further improve the support effect.

[0035] It should be further explained that both the limiting slide rod 33 and the limiting sleeve 32 have non-circular cross-sections. Therefore, the limiting slide rod 33 can only slide in the limiting sleeve 32 along its length.

[0036] The lower end of the fixed sleeve 2 is equipped with a base plate 11 via a connecting flange 10. The bottom surface of the base plate 11 is integrally provided with a soil-breaking cone 12, which is better fixed to the bottom surface of the hole. The base plate 11 is hollow and has filter holes on its periphery. The lower end of the rotating pipe 4 is connected to the base plate 11. The hollow base plate 11, together with the rotating pipe 4 and the water pump, can pump the water at the bottom of the hole upwards to achieve the effect of water reduction, which is beneficial to the stable support of the hole.

[0037] To facilitate adapting to the support requirements of drilling at different depths, the fixed sleeve 2 is provided with multiple sections. Adjacent fixed sleeve sections 2 are connected by connecting flanges 10. The ends of the rotating tubes 4 inside the two adjacent fixed sleeves 2 are respectively provided with matching positioning protrusions 8 and positioning recesses 9. The positioning protrusions 8 and positioning recesses 9 are non-circular to ensure that the two rotating tubes 4 that are engaged by the positioning protrusions 8 and positioning recesses 9 can rotate synchronously.

[0038] In addition, staff can roughly determine the deformation of the hole by observing the change in the tilt angle of the protective cover plate 1.

[0039] The working principle of this utility model is as follows: After the drive motor 13 is started, the rotating tube 4 rotates along its axis through the cooperation of the first bevel gear 14 and the second bevel gear 15. The threaded rod 31 rotates along its axis through the cooperation of the driving bevel gear 5 and the driven bevel gear 6. The threaded cooperation between the threaded rod 31 and the limiting slide rod 33 and the limiting slide rod 33 and the limiting slide sleeve 32 cause the limiting slide rod 33 to slide outward along the limiting slide sleeve 32. Multiple telescopic support components 3 extend synchronously, so that the telescopic support components 3 support the inner wall of the hole. During the support process, the hollow cover-shaped chassis 11 can be used in conjunction with the rotating tube 4 and the water pump to pump the water at the bottom of the hole upward, thereby achieving the effect of water reduction and facilitating the stable support of the hole.

[0040] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A borehole wall support device for rotary pile drilling, characterized in that, include: Protective cover plate (1); A fixing sleeve (2) is arranged coaxially with the protective cover plate (1) and fixed to the lower end of the protective cover plate (1); Telescopic support assembly (3), wherein multiple telescopic support assemblies (3) are provided, and multiple telescopic support assemblies (3) are evenly installed on the outer side of the fixed sleeve (2). A drive mechanism for driving multiple telescopic support assemblies (3) to telescopically extend and retract synchronously is installed between the protective cover plate (1) and the fixed sleeve (2).

2. The borehole wall support device for rotary pile drilling construction according to claim 1, characterized in that: The telescopic support assembly (3) includes a threaded rod (31), a limiting sleeve (32), and a limiting slide rod (33). The threaded rod (31) is horizontally rotatably mounted on the side end of the fixed sleeve (2) and passes through the fixed sleeve (2). The limiting sleeve (32) is horizontally fixed on the outer wall of the fixed sleeve (2). The limiting slide rod (33) is slidably sleeved on the inner side of the limiting sleeve (32), and the end of the limiting slide rod (33) away from the fixed sleeve (2) protrudes out of the outer side of the limiting sleeve (32). The limiting sleeve (32) is threadedly sleeved on the outer side of the threaded rod (31). The driving mechanism includes a driving component, a rotating tube (4) and multiple reversing components. The driving component is installed on the upper end of the protective cover plate (1) and connected to the rotating tube (4). The rotating tube (4) is coaxially rotatably installed on the inner side of the fixed sleeve (2). The multiple reversing components are correspondingly installed between the rotating tube (4) and the multiple threaded rods (31).

3. The borehole wall support device for rotary pile drilling construction according to claim 2, characterized in that: The reversing assembly includes a driving bevel gear (5) and a driven bevel gear (6). The driving bevel gear (5) is coaxially fixed on the rotating tube (4), and the driven bevel gear (6) is coaxially fixed on the threaded rod (31) and meshes with the driving bevel gear (5).

4. The borehole wall support device for rotary pile drilling construction according to claim 2, characterized in that: The drive assembly includes a drive motor (13), a first bevel gear (14), and a second bevel gear (15). The drive motor (13) is mounted on the upper end of the protective cover plate (1). The first bevel gear (14) is coaxially fixed to the output end of the drive motor (13). The second bevel gear (15) is coaxially fixed to the rotating tube (4) and meshes with the first bevel gear (14). A water pipe is installed on the upper end of the rotating tube (4) through a sealing connector (16), and a water pump is installed on the other end of the water pipe.

5. A borehole wall support device for rotary pile drilling construction according to claim 2, characterized in that: The lower end of the fixed sleeve (2) is fitted with a base plate (11) via a connecting flange (10). The bottom surface of the base plate (11) is integrally provided with a soil-breaking cone (12). The base plate (11) is hollow and has filter holes on its periphery. The lower end of the rotating tube (4) is connected to the base plate (11).

6. A borehole wall support device for rotary pile drilling construction according to claim 2, characterized in that: The fixed sleeve (2) is provided with multiple sections, and two adjacent fixed sleeve sections (2) are connected by a connecting flange (10). The ends of the rotating tube (4) on the inner side of two adjacent fixed sleeves (2) are respectively provided with matching positioning protrusions (8) and positioning recesses (9).

7. A borehole wall support device for rotary pile drilling construction according to claim 2, characterized in that: The end of the limiting slide bar (33) away from the rotating tube (4) is vertically fixed with a support plate (7).

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