A hole-forming auxiliary device for a microporous cast-in-place pile in a desert region

Abstract

This utility model relates to the field of micro-hole cast-in-place pile technology, and more particularly to an auxiliary device for drilling micro-hole cast-in-place piles in desert areas. It includes a casing, a sand-discharging component, and an auxiliary component. The casing contains a sand-discharging component to prevent sand from entering the cast-in-place structure, while the casing contains an auxiliary component to ensure stability during grouting. The sand-discharging component includes a grouting pipe, and a grouting pipe for maintaining stability during pouring is installed at the center inside the casing. A support frame for quick disassembly is fixedly connected to the bottom of the casing, and a positioning cone for disassembly and cleaning after pouring is threaded onto the lower surface of the support frame. Multiple sets of circumferential openings on the surface of the positioning cone allow some sand particles to enter the inner side. This utility model achieves enhanced hole wall stability and reduced hole collapse risk during drilling through the casing and helical blade design. In particular, the helical blade provides additional support force, helping to maintain the stability of the hole shape.

Description

Technical Field

[0001] This utility model relates to the field of micro-hole cast-in-place pile technology, and in particular to an auxiliary device for forming micro-hole cast-in-place piles in desert areas. Background Technology

[0002] Desert micro-hole cast-in-place piles are a type of drilled cast-in-place pile used in desert environments. Their diameter is generally 10–30 cm, and their slenderness ratio is generally greater than 30. The pile body is composed of pressure-grown cement mortar or small-aggregate concrete and reinforcing materials (such as steel bars, steel pipes, or other structural steel). The diameter of desert micro-hole cast-in-place piles is generally 10–30 cm, suitable for soft geological conditions such as deserts. The slenderness ratio is generally greater than 30, increasing the pile's stability. The pile body is composed of pressure-grown cement mortar or small-aggregate concrete and reinforcing materials; steel bars, steel pipes, or other structural steel can be selected as needed.

[0003] Meanwhile, when carrying out engineering construction in desert areas, due to the unique geological conditions, especially the presence of aeolian sand and gravel layers, the soil has poor cohesion. This means that the binding force between soil particles is very weak, and they can hardly maintain any shape or structure on their own without external support. Therefore, borehole collapse is very likely to occur during drilling, which not only affects the progress of the project, but may also threaten the construction quality and safety. In addition, the dryness of desert areas means that the mud is quickly absorbed or seeped into the loose and dry sand layer, making it difficult to maintain the mud level. This causes the borehole wall to lose the necessary support and become extremely unstable. Utility Model Content

[0004] To overcome the problems in desert areas where the presence of aeolian sand and gravel layers results in poor soil cohesion, making it easy for boreholes to collapse during drilling, and where the rapid loss of mud in loose sand layers makes it difficult to maintain borehole stability, this utility model provides an auxiliary device for drilling micro-hole cast-in-place piles in desert areas.

[0005] The technical solution is as follows: A drilling auxiliary device for micro-hole cast-in-place piles in desert areas includes a casing; it also includes a sand discharge component and an auxiliary component; a sand discharge component is installed inside the casing to prevent sand from entering the cast-in-place structure, and an auxiliary component is installed on the outside of the casing to ensure stability during casting. The sand discharge component includes a casting pipe, and a casting pipe for maintaining stability during pouring is installed in the center of the casing. A support frame for quick disassembly is fixedly connected to the bottom of the casing, and a positioning cone for disassembly and cleaning is threaded onto the lower surface of the support frame. Multiple sets of sand discharge holes are opened around the surface of the positioning cone to allow some sand particles to enter the inner side, reduce the pressure of the outer sand layer, and facilitate cleaning. A sand discharge cavity corresponding to the sand discharge holes is opened between the casing and the casting pipe, and a casting cavity is opened inside the casting pipe.

[0006] Furthermore, multiple sets of connecting brackets that are fixedly connected to the sleeve are installed around the top of the inner side of the injection pipe, and a fastening post that is fastened to the positioning cone is provided around the outer side of the lower end of the injection pipe.

[0007] Furthermore, a support block is installed at the center of the positioning cone, and a fourth threaded groove is formed around the upper outer side of the support block.

[0008] Furthermore, a third threaded groove corresponding to the fourth threaded groove is provided around the lower inner side of the positioning cone, and a rotating plate is provided laterally at the center of the lower surface of the support block for disassembling the support block from the positioning cone during reverse rotation.

[0009] Furthermore, a first threaded groove is formed around the outer side of the lower end of the sleeve, and a second threaded groove corresponding to the first threaded groove is formed around the inner side of the support frame.

[0010] Furthermore, the auxiliary components include helical blades, which are mounted around the outside of the sleeve from bottom to top.

[0011] Furthermore, a stop plate is fixedly connected to the outer side of the upper end of the sleeve, and a fixing plate is installed on the upper end of the stop plate.

[0012] Furthermore, multiple sets of connecting rods are installed around the fixing plate and the backing plate, and a fastening frame is installed at the center of the upper surface of the fixing plate.

[0013] The beneficial effects are as follows: This invention provides additional support during drilling by installing helical blades as an auxiliary component on the outside of the casing, which helps maintain the stability of the borehole shape and reduces the risk of borehole collapse. This is particularly important in desert geological conditions where the soil has poor cohesion and is prone to borehole collapse. The device is equipped with a sand discharge component, including sand discharge holes and corresponding sand discharge chambers opened on the surface of the positioning cone. This allows some sand particles to enter the inner side to reduce the pressure of the external sand layer and effectively prevents sand from entering the interior of the grouting structure, thereby ensuring that the quality of the concrete is not affected. After pouring, the quick-disassembly support frame and positioning cone design make the equipment easy to disassemble and clean, reducing the workload and difficulty of subsequent processing and improving construction efficiency. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of an auxiliary device for drilling micro-hole cast-in-place piles in desert areas according to the present invention;

[0015] Figure 2 This is a schematic diagram of the sand discharge hole structure of this utility model;

[0016] Figure 3 This is a schematic diagram of the interlocking column structure of this utility model;

[0017] Figure 4 This is a schematic diagram of the infusion cavity structure of this utility model;

[0018] Figure 5 This is a schematic diagram of the third threaded groove structure of this utility model.

[0019] In the attached drawings, the following are the reference numerals: 1. Sleeve; 201. Spiral blade; 202. Abutment plate; 203. Connecting rod; 204. Fixing plate; 205. Fastening frame; 301. Injection pipe; 302. Support frame; 303. Positioning cone; 304. Sand discharge hole; 305. Connecting frame; 306. First threaded groove; 307. Fastening post; 308. Second threaded groove; 309. Sand discharge chamber; 310. Injection chamber; 311. Support block; 312. Third threaded groove; 313. Fourth threaded groove; 314. Rotating plate. Detailed Implementation

[0020] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0021] Among the currently discovered feasible technologies, the following are described:

[0022] Desert micro-hole cast-in-place piles are a type of bored pile specifically designed for use in soft geological conditions such as deserts. Their main characteristics are a small diameter and a high slenderness ratio, giving them unique advantages in complex geological environments. The diameter of this type of pile is generally between 10 and 30 centimeters. The relatively small diameter not only facilitates construction in confined spaces but also reduces the impact on the surrounding soil structure and lowers construction difficulty. The longer and thinner pile design increases pile stability, especially in sandy or gravelly foundations. This design provides better vertical bearing capacity and lateral stability, effectively resisting the effects of horizontal forces and seismic loads. The pile body is filled with cement mortar or small-aggregate concrete through pressure grouting, ensuring the density and uniformity of the internal materials and improving the overall strength and durability of the pile. Depending on the project requirements, different reinforcement materials can be selected to enhance the mechanical properties of the pile. Commonly used reinforcement materials include steel bars, steel pipes, or other structural steel sections. These materials significantly improve the bending stiffness and bearing capacity of piles, making them suitable for various load requirements. Thanks to specialized drilling aids (such as the previously described casings, sand-draining components, and spiral blades), micro-hole cast-in-place piles in desert regions can effectively form stable foundation support structures under loose and unstable geological conditions. This is crucial for infrastructure construction in desert areas, where geological conditions often pose significant challenges to traditional construction methods. This type of cast-in-place pile is widely used in various construction projects requiring deep foundation support, such as bridges, high-rise buildings, and wind power stations. Especially in desert regions, it provides an effective solution to the problem of unstable foundations. Utilizing specially designed micro-hole cast-in-place pile drilling aids can improve work efficiency while ensuring construction quality, reducing resource consumption and environmental impact. Compared to traditional open-cut foundation construction, this method reduces earthwork and minimizes damage to the surrounding ecological environment, embodying the concept of green construction.

[0023] Construction projects in desert regions face extremely unique and complex geological conditions. Due to the presence of aeolian sand and gravel layers, the soil here has very poor cohesion, and the binding force between soil particles is very weak, making it almost impossible for the soil to maintain any shape or structure on its own without external support. This characteristic brings many challenges to the implementation of engineering projects, especially in the construction of bored piles. The poor soil cohesion makes it difficult to maintain structural stability. Under these loose geological conditions, the drilling process is prone to borehole collapse. Once drilling begins, the surrounding sand and gravel lose their support and quickly slide into the hole, causing the borehole wall to collapse. This not only interrupts the construction progress but may also damage the completed parts, affecting the overall construction quality and safety. The problem of mud loss is exacerbated. The dry environment of the desert makes the mud loss rate in the loose and dry sand layer exceptionally fast. Traditional mud wall protection methods are inadequate here because the mud is quickly absorbed or seeped into the surrounding soil, making it difficult to maintain a stable mud level. The primary function of drilling mud is to protect the borehole walls from erosion and provide necessary support for the borehole. However, in such an environment, its effectiveness is greatly reduced, as the borehole walls lose the necessary support and become extremely unstable.

[0024] Micro-hole cast-in-place pile technology, with its smaller diameter (typically 10 to 30 cm) and larger slenderness ratio (generally greater than 30), can alleviate these problems to some extent. Its design allows for more precise control of pressure and flow rate during drilling, reducing disturbance to the surrounding soil and thus lowering the risk of borehole collapse. Specialized drilling aids are used; for example, the casing system with sand discharge components and helical blades, as mentioned earlier, can provide additional physical support during drilling, enhancing borehole stability. Simultaneously, the design of sand discharge holes can effectively remove some sand particles, reducing pressure from the external sand layer and further stabilizing the borehole wall. Optimized mud formulation and application technology are also crucial: to address the problem of rapid mud loss, the mud composition can be adjusted to increase its viscosity or special additives can be used to slow the mud's penetration rate in the sand layer. Furthermore, more advanced mud circulation systems can be used to ensure that mud continuously and effectively covers the borehole wall, providing necessary support. Strengthened on-site management and monitoring are also essential: real-time monitoring of various parameters during drilling, such as borehole wall stability and mud level, allows for timely detection and handling of potential problems. This not only helps improve construction efficiency but also effectively ensures construction safety. In summary, when carrying out engineering construction in desert areas, facing problems such as poor soil cohesion, easy hole collapse, and rapid mud loss, it is necessary to comprehensively utilize various means such as technological innovation and scientific management to ensure the smooth progress of the project and achieve the expected quality and safety standards. These measures not only improve the success rate of construction but also provide valuable experience and technical accumulation for infrastructure construction under similar geological conditions.

[0025] like Figures 1-5 As shown, a drilling auxiliary device for micro-pore cast-in-place piles in desert areas includes a casing 1; it also includes a sand discharge component and an auxiliary component; the casing 1 is equipped with a sand discharge component to prevent sand from entering the cast-in-place structure, and the casing 1 is equipped with an auxiliary component to ensure stability during casting. The sand discharge component includes a casting pipe 301. The casing 1 is equipped with a casting pipe 301 at its center to maintain stability during casting. The bottom of the casing 1 is fixedly connected to a support frame 302 for quick disassembly. The lower surface of the support frame 302 is threadedly connected to a positioning cone 303 for disassembly and cleaning after casting. The positioning cone 303 has multiple sets of sand discharge holes 304 around its surface to allow some sand particles to enter the inner side, reduce the pressure of the outer sand layer, and facilitate cleaning. A sand discharge cavity 309 corresponding to the sand discharge hole 304 is opened between the casing 1 and the casting pipe 301. A casting cavity 310 is opened inside the casting pipe 301.

[0026] Multiple sets of connecting brackets 305, which are fixedly connected to the sleeve 1, are installed around the top inner side of the injection pipe 301. A fastening post 307, which engages with the positioning cone 303, is provided around the outer lower end of the injection pipe 301. By installing multiple sets of connecting brackets 305 on the top inner side of the injection pipe 301, a stable connection between the injection pipe 301 and the sleeve 1 is achieved, enhancing the stability of the overall structure. A support block 311 is installed at the center inside the positioning cone 303. A fourth threaded groove 313 is provided around the upper outer side of the support block 311, providing additional support and ensuring a tight connection between components, thus improving the stability of the device. A third threaded groove 312, corresponding to the fourth threaded groove 313, is provided around the lower inner side of the positioning cone 303. A rotating plate 314, which is laterally provided at the center of the lower surface of the support block 311, is used to disassemble the support block 311 from the positioning cone 303 during reverse rotation. The design of the rotating plate 314 allows the support block 311 to be easily disassembled during reverse rotation, simplifying the maintenance and cleaning process.

[0027] Multiple sets of connecting brackets 305 are installed around the top inner side of the grouting pipe 301. These connecting brackets 305 are fixedly connected to the sleeve 1, which enables the grouting pipe 301 to remain stable during pouring and enhances the stability of the overall structure. This design ensures the overall rigidity and verticality of the device during drilling and grouting under loose desert geological conditions. The design of the two threaded grooves ensures a tight connection between the components. When disassembly, maintenance or cleaning is required, the support block 311 can be easily removed from the positioning cone 303 by simply rotating the rotating plate 314, which is horizontally set at the center of the lower surface of the support block 311, in the opposite direction. This simplifies the maintenance and cleaning process. Multiple sets of sand discharge holes 304 are opened around the surface of the positioning cone 303, allowing some sand particles to enter the inner side, reducing the pressure of the external sand layer and facilitating subsequent cleaning. A sand discharge cavity 309 corresponding to the sand discharge holes 304 is opened between the sleeve 1 and the grouting pipe 301. This not only helps to reduce the rate of mud loss, but also effectively prevents sand from entering the interior of the grouting structure, thereby ensuring the quality of the concrete.

[0028] Please see Figures 3-4 The lower outer side of the casing 1 is provided with a first threaded groove 306, and the inner side of the support frame 302 is provided with a second threaded groove 308 corresponding to the first threaded groove 306. This facilitates quick and secure assembly and disassembly of the entire device, improving construction efficiency. The auxiliary component includes a spiral blade 201. The spiral blade 201 is installed around the outer side of the casing 1 from bottom to top. The spiral blade 201 in the auxiliary component is installed around the outer side of the casing 1 and distributed from bottom to top, effectively enhancing the structural stability during the drilling process and reducing the risk of hole collapse. The upper outer side of the casing 1 is fixedly connected. There is a support plate 202, and a fixing plate 204 is installed on the upper end of the support plate 202. The support plate 202 on the outer side of the upper end of the sleeve 1 and the fixing plate 204 above it are reinforced by connecting rods 203, which provides additional external support for the entire device, enhances the robustness and safety of the device. Multiple sets of connecting rods 203 are installed around the fixing plate 204 and the support plate 202. A fastening frame 205 is installed at the center of the upper surface of the fixing plate 204. The fastening frame 205 installed at the center of the fixing plate 204 facilitates the lifting or fixing of the device, simplifies the on-site operation process, and improves work efficiency.

[0029] The first threaded groove 306 around the lower outer side of the casing 1 and the corresponding second threaded groove 308 on the inner side of the support frame 302 allow the entire device to be quickly and securely assembled and disassembled through a simple rotational motion. The helical blades 201 in the auxiliary components are mounted around the outside of the casing 1 and distributed from bottom to top. During drilling, these helical blades 201 provide additional support, effectively enhancing the stability of the structure and reducing the risk of borehole collapse due to loose geological conditions. The abutment plate 202 fixedly connected to the upper outer side of the casing 1 and the fixing plate 204 above it are reinforced by multiple sets of connecting rods 203, providing additional external support for the entire device. The fastening frame 205 installed at the center of the fixing plate 204 facilitates lifting or securing the entire device. This design simplifies the on-site operation process, making the handling, positioning, and securing of the equipment easier and more efficient.

[0030] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. 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. An auxiliary device for drilling micro-hole cast-in-place piles in desert areas, characterized in that, It includes a casing (1); it also includes a sand discharge component and an auxiliary component; the casing (1) is equipped with a sand discharge component to prevent sand from entering the grouting structure, and the casing (1) is equipped with an auxiliary component to ensure stability during grouting. The sand discharge component includes a grouting pipe (301). The casing (1) is equipped with a grouting pipe (301) to maintain stability during pouring. The bottom of the casing (1) is fixedly connected to a support frame (302) for quick disassembly. The lower surface of the support frame (302) is threaded with a positioning cone (303) for disassembly and cleaning after pouring. The positioning cone (303) has multiple sand discharge holes (304) around its surface to allow some sand particles to enter the inner side, reduce the pressure of the outer sand layer, and facilitate cleaning. A sand discharge cavity (309) corresponding to the sand discharge hole (304) is opened between the casing (1) and the grouting pipe (301). A grouting cavity (310) is opened inside the grouting pipe (301).

2. The auxiliary device for drilling micro-hole cast-in-place piles in desert areas according to claim 1, characterized in that, Multiple sets of connecting brackets (305) that are fixedly connected to the sleeve (1) are installed around the top of the inner side of the injection pipe (301), and a fastening post (307) that is fastened to the positioning cone (303) is provided around the outer side of the lower end of the injection pipe (301).

3. The device according to claim 1, characterized in that, A support block (311) is installed in the center of the positioning cone (303), and a fourth threaded groove (313) is opened around the upper outer side of the support block (311).

4. The device according to claim 1, characterized in that, The lower inner side of the positioning cone (303) is surrounded by a third thread groove (312) corresponding to the fourth thread groove (313). The lower surface of the support block (311) is provided with a rotating plate (314) for disassembling the support block (311) from the positioning cone (303) during reverse rotation.

5. The auxiliary device for drilling micro-hole cast-in-place piles in desert areas according to claim 1, characterized in that, The lower end of the sleeve (1) is surrounded by a first threaded groove (306), and the inner side of the support frame (302) is surrounded by a second threaded groove (308) corresponding to the first threaded groove (306).

6. The device according to claim 1, characterized in that, The auxiliary components include a helical blade (201), and the helical blade (201) is installed around the outside of the sleeve (1) from bottom to top.

7. The device according to claim 1, characterized in that, A stop plate (202) is fixedly connected to the outer side of the upper end of the sleeve (1), and a fixing plate (204) is installed on the upper end of the stop plate (202).

8. The device according to claim 7, characterized in that, Multiple sets of connecting rods (203) are installed around the fixing plate (204) and the back plate (202), and a fastening frame (205) is installed at the center of the upper surface of the fixing plate (204).

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